CN207765944U - A kind of over-pressure safety device, power module and Electrical Towage Control Systems - Google Patents

Abstract

The utility model discloses a kind of over-pressure safety device, power module and Electrical Towage Control Systems, wherein the device includes：Over-pressed detection unit (1) and protection driving unit (2)；Wherein, the overvoltage detection unit (1); before being less than the upper limit of the first setting voltage range for the DC bus-bar voltage caused by being mutated by the AC supply voltage of power module input side to be protected, predict whether the DC bus-bar voltage will be more than the upper limit of the first setting voltage range；The protection driving unit (2); in the case that DC bus-bar voltage is by the upper limit for setting voltage range more than described first caused by for predicting and being mutated by the AC supply voltage in the over-pressed detection unit (1), the protection act of setting is executed.The embodiment of the utility model the defects of can overcoming protection in the prior art promptness is poor, reliability is low and is big to device damage, is realized and protects that promptness is good, reliability is high and damages small advantageous effect to device.

Description

A kind of over-pressure safety device, power module and Electrical Towage Control Systems

Technical field

The utility model belongs to power control technology field, and in particular to a kind of over-pressure safety device, power module and electricity Power drive control system more particularly to a kind of bus overvoltage for effectivelying prevent supply voltage sudden change protect circuit, have the busbar The power supply of overvoltage crowbar, the overvoltage with the Electrical Towage Control Systems of the power supply and the Electrical Towage Control Systems Guard method.

Background technology

Electrical Towage Control Systems is mainly made of motor and control device；Wherein, control device can utilize electricity Motivation drives control object to carry out Electric Traction control (also known as electrical drive control system).At present in Electrical Towage Control Systems, become Frequency device is by the main conversion for completing AC-DC-exchange, in the conversion process, if busbar voltage is more than certain limit value, meeting Cause frequency converter abnormal work, can burn power component under serious situation.

Wherein, there are many kinds of the reasons for causing DC bus-bar voltage overvoltage, such as：Grid voltage mutation, load are unloaded suddenly Carry etc..In practical applications, DC bus-bar voltage protection against excessive pressure can be generally taken, it is when primarily directed to motor braking or prominent So unloading causes busbar voltage to rise violently to be protected；This protection is usually just protected in the case where busbar is over-pressed Shield, the response speed of protection act is slower, and the damage to power component is larger.

In the prior art, there is protection, promptness is poor, reliability is low and damages the defects of big to device.

Utility model content

The purpose of this utility model is that in view of the foregoing drawbacks, a kind of over-pressure safety device, power module and electric power are provided Drive control system, to solve just to carry out protecting in the case where busbar is over-pressed in the prior art to cause to protect promptness poor The problem of, achieve the effect that promote protection promptness.

The utility model provides a kind of over-pressure safety device, including：Over-pressed detection unit and protection driving unit；Wherein, The overvoltage detection unit, in the DC bus caused by the mutation of the AC supply voltage of power module input side to be protected Before voltage is less than the upper limit of the first setting voltage range, predict whether the DC bus-bar voltage will be more than first setting The upper limit of voltage range；The protection driving unit, for being predicted by AC power electricity in the over-pressed detection unit DC bus-bar voltage caused by pressure mutation executes the guarantor of setting by the case of the upper limit for setting voltage range more than described first Shield acts.

Optionally, wherein it is straight caused by AC supply voltage mutation to be additionally operable to detection for the overvoltage detection unit Whether stream busbar voltage falls below the lower limit of the first setting voltage range；The protection driving unit, is additionally operable to DC bus-bar voltage caused by being mutated by the AC supply voltage falls below the lower limit of the first setting voltage range In the case of, cancel the protection act；And/or the over-pressed detection unit, it is additionally operable to detect by the negative of the power module Carry the upper limit whether bus capacitor voltage caused by unloading sets voltage range more than second；The protection driving unit, is also used In by the power module load unloading caused by bus capacitor voltage be more than it is described second set voltage range it is upper In the case of limit, the protection act of setting is executed；And/or the over-pressed detection unit, detection is additionally operable to by the power module Load unloading caused by bus capacitor voltage whether fall below the lower limit of the second setting voltage range；The protection driving Unit is additionally operable to fall below second setting in the bus capacitor voltage caused by the load of power module unloading In the case of the lower limit of voltage range, cancel the protection act action.

Optionally, wherein the protection act of setting is executed, including：Turn off the driving of rectification circuit in the power module Signal；The rectification circuit obtains the DC bus-bar voltage for carrying out rectification to the AC supply voltage；And/or When the protection driving unit is additionally operable to cancel the protection act, cancel the protection act, including：Open the power supply The drive signal of rectification circuit in module.

Optionally, wherein the rectification circuit, including：Scr rectification circuit；The driving of the scr rectification circuit Signal, including：Thyristor driver signal；And/or the first setting voltage range, including：380V~750V；And/or when The overvoltage detection unit be additionally operable to detect bus capacitor voltage caused by the load unloading by the power module whether be more than When the upper limit of the second setting voltage range, the second setting voltage range is identical as the first setting voltage range.

Optionally, the over-pressed detection unit, including：Bus overvoltage protection signal generation circuit；The bus overvoltage is protected Signal generating circuit is protected, including：Input selection circuit, benchmark power supply circuit and hysteresis loop comparator；Wherein, the input selection electricity Road is compared for the line voltage to the AC power with the magnitude relationship of DC bus-bar voltage, by the line voltage With the larger voltage in the DC bus-bar voltage, it is selected as the anti-phase input electricity of the inverting input of the hysteresis loop comparator Pressure；The benchmark power supply circuit provides together for the reference voltage according to setting for the in-phase input end of the hysteresis loop comparator Phase reference voltage；The hysteresis loop comparator sets the reverse inter-input-ing voltage and first for being based on the same phase reference voltage Constant voltage range or the second setting voltage range are compared, so that its output end exports corresponding high level or low level, are made For the overvoltage protection signal needed for the protection driving unit；And/or the protection driving unit, including：Drive signal amplifies Circuit；The drive signal amplifying circuit, including：With computing circuit and driving circuit；Wherein, described and computing circuit, is used for When the over-pressed detection unit includes hysteresis loop comparator, by the drive signal of rectification circuit in the power module with it is described stagnant Return comparator output the overvoltage protection signal carry out with after operation, output for control the driving circuit can make it is described The control signal that drive signal is effectively driven；The driving circuit, in the control with computing circuit output Under the control of signal processed, driving in vain or effectively driving are carried out to the drive signal, the protection act is held with realizing Row or the corresponding control cancelled.

Optionally, wherein the overvoltage detection unit is predicted is mutated caused direct current mother by the AC supply voltage Line voltage will set the situation of the upper limit of voltage range more than described first, including：The input selection circuit is electric by the line Pressure is selected as the reverse inter-input-ing voltage of the inverting input of the hysteresis loop comparator；And/or the over-pressed detection unit detection It has been more than the upper limit of the second setting voltage range to bus capacitor voltage caused by the load unloading by the power module Situation, including：The DC bus-bar voltage is selected as the anti-phase input of the hysteresis loop comparator by the input selection circuit The reverse inter-input-ing voltage at end；And/or the input selection circuit, including：First rectification module, the second rectification module and first Partial pressure and filter module；Wherein, first rectification module, for carrying out rectification processing to the DC bus-bar voltage；It is described Second rectification module, for carrying out rectification processing to the line voltage；First partial pressure and filter module, for described the After two rectification modules carry out rectification processing to the line voltage, is further divided and be filtered；And/or the benchmark Power supply circuit, including：Second partial pressure and filter module；Second partial pressure and filter module, for the benchmark to setting Voltage is divided and is filtered；And/or the hysteresis loop comparator, including：First comparator and positive feedback module；It is described Positive feedback module is set between the output end and in-phase input end of the first comparator；And/or the hysteresis loop comparator Make its output end output high level or low level, including：It is less than the first setting voltage model in the reverse inter-input-ing voltage In the case of the upper limit of the upper limit or the second setting voltage range enclosed, output end is made to export high level；And/or described The case where upper limit of the upper limit or the second setting voltage range that reverse inter-input-ing voltage sets voltage range more than described first Under, make to jump to low level under the high level of the output end；And/or it is reduced to and is not below in the reverse inter-input-ing voltage In the case of the lower limit of the first setting voltage range or the lower limit of the second setting voltage range, the output end is made to protect Hold the low level；And/or fall below lower limit or the institute of the first setting voltage range in the reverse inter-input-ing voltage In the case of the lower limit for stating the second setting voltage range, make high level described in rebound in the low level of the output end；With/ Or, can described export the control that make the drive signal effectively be driven for controlling the driving circuit with computing circuit Signal, including：In the case where the overvoltage protection signal is high level, the control signal is high level, needs to cancel institute State protection act；It is low level in the overvoltage protection signal, the control signal is low level, needs to execute institute State protection act；And/or the driving circuit, including：Driving chip and protection module；The driving chip, for described In the case of signal is controlled as high level, power amplification processing is carried out to the drive signal, to realize to the drive signal Effective driving；It is low level in the control signal, turns off the drive signal, the driving is believed with realizing Number invalid driving；The protection module, after in the driving chip to drive signal progress power amplification processing, Further carry out pressure limiting and/or current limliting processing.

Optionally, the over-pressed detection unit further includes：Circuit occurs for line voltage；Circuit, packet occur for the line voltage It includes：First input module, the second input module and the second comparator；Wherein, first input module is used for described second The inverting input of comparator inputs the first phase voltage in the AC supply voltage；Second input module, for The in-phase input end of second comparator inputs the second phase voltage in the AC supply voltage；Second comparator, After carrying out calculus of differences processing to first phase voltage and second phase voltage, first phase voltage and institute are exported State the corresponding line voltage of the second phase voltage.

Optionally, the over-pressed detection unit further includes：Voltage ratio scales circuit；The voltage ratio scales circuit, Including：Division module and voltage follower；Wherein, the division module treats scaling for the voltage scaling ratio in setting Voltage carries out voltage division processing；Wherein, described to wait for scaled voltage, including：The phase voltage and/or the DC bus-bar voltage；Institute Voltage follower is stated, for carrying out voltage division processing to the phase voltage and/or the DC bus-bar voltage in the division module Afterwards, further carry out voltage order one follow processing, obtain the input selection circuit input side DC bus-bar voltage, and/or Any phase voltage of circuit input side occurs for the line voltage.

Optionally, wherein first input module, including：Third divides and filter module；The third partial pressure and filter Wave module, for first phase voltage to be divided and is filtered；And/or second input module, including：The Four partial pressures and filter module；4th partial pressure and filter module, for being carried out at partial pressure and filtering to second phase voltage Reason；And/or the division module, including：First divider resistance and the second divider resistance, the first divider resistance setting exist Described to wait between scaled voltage and the in-phase input end of the voltage follower, second divider resistance is arranged in the voltage Between the in-phase input end and ground of follower；Wherein, the resistance value of first divider resistance is higher than second divider resistance Resistance value sets Standard resistance range；And/or the voltage scaling ratio for waiting for scaled voltage, including：The resistance of second divider resistance Value accounts for the ratio of the sum of resistance value of first divider resistance and second divider resistance；And/or the electricity of the phase voltage Scaling is pressed, is differed with the voltage scaling ratio of the DC bus-bar voltage；And/or second comparator and described At least one of voltage follower, including：Dual power supply operational amplifier.

Matching with above-mentioned over-pressure safety device, the utility model another further aspect provides a kind of power module, including：Rectification Circuit；Further include：Above-described over-pressure safety device；Wherein, the over-pressure safety device, setting AC power with it is described Between rectification circuit, for by providing effective or invalid drive signal for the rectification circuit, realizing to the rectified current The load-carrying overvoltage protection in road and/or power module institute.

Matching with above-mentioned power module, on the other hand the utility model provides a kind of Electrical Towage Control Systems, including： Above-described power module.

The embodiment of the utility model, by the overvoltage crowbar of scr rectification circuit, except through conventional overvoltage It protects other than circuit, busbar voltage overvoltage caused by supply voltage sudden change can be effectively predicted, and then take safeguard measure in advance, carry The promptness and reliability of protection are risen.

Further, the embodiment of the utility model can be in advance to because of supply voltage by busbar voltage over-voltage detection circuit It is mutated and the situation of overvoltage is caused to effectively protect, reliability is high, and safety is good.

Further, the embodiment of the utility model, after being acted in execution overvoltage protection, when supply voltage reduces centainly When degree, rectification circuit can restore to work normally automatically, be unlikely to entire Electrical Towage Control Systems and shut down, to whole system Protection it is effective rapidly, enhance the security reliability of entire Electrical Towage Control Systems.

Further, the embodiment of the utility model works as supply voltage by the way that line voltage to be compared with DC bus-bar voltage When mutation, line voltage action can be faster than busbar voltage, protection circuit compared to traditional detection protection circuit will shift to an earlier date into Row protection, improves the reliability of whole system, reduces the damage to power device.

The embodiment of the utility model as a result, by comparing the line voltage of three-phase alternating-current supply and DC bus-bar voltage Compared with predicting DC bus-bar voltage before the DC bus-bar voltage caused by supply voltage sudden change is less than given threshold will mistake When pressure (being more than given threshold), protection act is executed in advance, solves the ability in the case where busbar is over-pressed in the prior art Carrying out protection leads to the problem for protecting promptness difference, to overcome and protect that promptness is poor, reliability is low in the prior art and to device Part damages big defect, realizes that protection promptness is good, reliability is high and small advantageous effect is damaged to device.

Other features and advantages of the utility model will illustrate in the following description, also, partly from specification In become apparent, or understood by implementing the utility model.

Below by drawings and examples, the technical solution of the utility model is described in further detail.

Description of the drawings

Fig. 1 is the structural schematic diagram of an embodiment of the over-pressure safety device of the utility model；

Fig. 2 is the structural schematic diagram of another embodiment of the over-pressure safety device of the utility model；

Fig. 3 is the simulation architecture schematic diagram of the rectification circuit based on thyristor；

Fig. 4 is the emulation schematic diagram of the three-phase mains voltage (i.e. input power) of scr rectification circuit；

Fig. 5 is the emulation schematic diagram of the rectification inlet highway DC voltage of scr rectification circuit；

Fig. 6 scales the structural representation of an embodiment of circuit for voltage ratio in the over-pressure safety device of the utility model Figure；

Fig. 7 is the structural schematic diagram that an embodiment of circuit occurs for the over-pressure safety device neutral voltage of the utility model；

Fig. 8 is the knot of an embodiment of the over-pressure safety device median generatrix overvoltage protection signal generation circuit of the utility model Structure schematic diagram；

Fig. 9 be the utility model over-pressure safety device in driving circuit an embodiment structural schematic diagram；

Figure 10 is mutated in the over-voltage protection method for the Electrical Towage Control Systems of the utility model by AC supply voltage An embodiment of protection act is executed when the upper limit that caused DC bus-bar voltage will set voltage range more than described first Flow diagram；

Figure 11 is mutated in the over-voltage protection method for the Electrical Towage Control Systems of the utility model by AC supply voltage Caused DC bus-bar voltage executes an implementation of protection act when falling below the lower limit of the first setting voltage range The flow diagram of example；

Figure 12 is caused female to be unloaded by load in the over-voltage protection method of the Electrical Towage Control Systems of the utility model Line capacitance voltage executes the flow diagram of an embodiment of protection act when being more than the upper limit of the second setting voltage range；

Figure 13 is caused female to be unloaded by load in the over-voltage protection method of the Electrical Towage Control Systems of the utility model Line capacitance voltage cancels the flow signal of an embodiment of protection act when falling below the lower limit of the second setting voltage range Figure.

In conjunction with attached drawing, reference numeral is as follows in the utility model embodiment：

1- overvoltage detection units；11- voltage ratios scale circuit；111- division modules；112- voltage followers；12- lines Voltage generating circuit；The first input modules of 121-；The second input modules of 122-；The second comparators of 123-；13- bus overvoltages are protected Protect signal generating circuit；131- input selection circuits；132- benchmark power supply circuits；133- hysteresis loop comparators；2- protection drivings are single Member；21- drive signal amplifying circuits；211- and computing circuit；212- driving circuits.

Specific implementation mode

It is specific below in conjunction with the utility model to keep the purpose of this utility model, technical solution and advantage clearer Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment Only it is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field The every other embodiment that those of ordinary skill is obtained without making creative work, belongs to the utility model The range of protection.

Implement in embodiment at one, can whether over-pressed by overvoltage crowbar detection busbar, and pass through MCU roots It is acted according to the malfunction starting protection of bus overvoltage.

In one example, partial pressure sampling can be carried out to busbar voltage by precision resistance, be input to main control chip into Row analog-to-digital conversion is compared with the overvoltage threshold of setting, and bus overvoltage then closes the trigger pulse of rectifying device.

In one example, precision resistance is divided in proportion the voltage of the obtained voltage of sampling and the comparator other end into Row compares, which is obtained by precision voltage source, input fault status signal after comparing.

As it can be seen that both protected modes, be in the case where busbar is over-pressed, after being detected by overvoltage crowbar, Malfunction is sent into MCU, by MCU decision protection acts, response speed is relatively slow.

Such as：Bus overvoltage needs the detection of sensor or detection circuit, and the threshold value set is compared. For example the busbar voltage that three phase rectifier obtains is 540V, it is believed that all it is normal rectification state within 700V, more than 700V, Then it is considered malfunction, the bus voltage value detected is compared with 700V, then thinks be overvoltage more than 700V.

Such as：What overvoltage crowbar detected is exactly the voltage signal of busbar, is reduced according to a certain percentage, general to use Circuit divides or calculus of differences amplifying circuit.Bus overvoltage is also determining after sensing.Inherently a kind of means of detection, Purpose is to determine the state of busbar voltage.

Wherein, Fig. 3 and Fig. 4 illustrates a kind of special operating mode, i.e. three-phase mains voltage is mutated, since DC side has busbar Support Capacitor, busbar rising has certain reaction time, and usually three-phase mains voltage has the small time difference, any being not added with In the case of protection, if busbar voltage as shown in figure 5, overvoltage threshold is set in 750V, after only busbar voltage is more than 750V, Protection circuit just acts.

So, it can predict that busbar voltage i.e. will be over-pressed before being less than given threshold in busbar voltage, in advance Action, then can more quickly and efficiently prevent bus overvoltage, be further reduced the damage to power component.

Embodiment according to the present utility model provides a kind of over-pressure safety device, the mistake of the utility model as shown in Figure 1 Press the structural schematic diagram of an embodiment of protective device.The over-pressure safety device may include：Over-pressed detection unit 1 and protection are driven Moving cell 2.

In an optional example, the overvoltage detection unit 1 can be used for by power module input side to be protected AC power (such as：Three-phase alternating-current supply) DC bus-bar voltage caused by voltage jump is less than the first setting voltage range Before the upper limit, predict whether the DC bus-bar voltage will be more than the upper limit of the first setting voltage range.Overvoltage detection is single The concrete function of member 1 and processing are referring to step S110.

Wherein, described first voltage range is set, may include：380V~750V.

Such as：Since the virtual value of power grid three-phase voltage is 220V, 540V is obtained by rectifier bridge rectification, according to busbar electricity Hold and the specifications and models of power component, design over-voltage protection point be easy to cause busbar Support Capacitor in 750V more than 750V With the damage of power component.In view of the excessive often of short duration state of busbar voltage, so it is improper directly to shut down operation 's.Busbar voltage cannot be too low, and the too low motor that will also result in of busbar voltage cannot run well, and the point is selected according to actual conditions Voltage, it is assumed here that be 380V, just obtained the high and low thresholds of hysteresis loop comparator here.Such as：When busbar be more than 750V or Line voltage envelope moment is more than certain value, will protect circuit operation, close the trigger pulse of thyristor, when busbar voltage is low After 380V, the trigger pulse of thyristor can normally be sent out.

As a result, by being arranged to being mutated by AC supply voltage caused by DC bus-bar voltage carry out overvoltage protection in advance Voltage protection range, the overvoltage protection in advance of DC bus-bar voltage caused by can making to being mutated by AC supply voltage is more Rationally, also relatively reliable.

Optionally, example shown in Figure 2, the overvoltage detection unit 1 may include：Bus overvoltage protection signal Generation circuit 13.

Wherein, example shown in Figure 8, the bus overvoltage protection signal generation circuit 13 may include：Input choosing Select circuit 131, benchmark power supply circuit 132 and hysteresis loop comparator 133.

Such as：Busbar voltage over-voltage detection circuit shown in Fig. 8 belongs to bus overvoltage hysteresis comparison circuit.

In an optional specific example, the input selection circuit 131 can be used for the line electricity to the AC power Pressure is compared with the magnitude relationship of DC bus-bar voltage, by the larger electricity in the line voltage and the DC bus-bar voltage Pressure, is selected as the reverse inter-input-ing voltage of the inverting input of the hysteresis loop comparator 133.

Such as：In Fig. 8, in the reverse side of comparator U27-D, DC bus-bar voltage U_DCAfter rectifier diode D2, with Line voltage U_BA、U_CB、U_ACVoltage after rectified divider filter is compared, who it is big who will be transmitted to the reverse phase of comparator U27-D End.

More optionally, the input selection circuit 131 may include：First rectification module (such as：Rectifier diode D2), the second rectification module (such as：Rectifier diode D28 and rectifier diode D33) and first partial pressure and filter module (example Such as：By resistance R168, resistance R173 and capacitance the C85 partial pressure constituted and filter module).

Such as：Diode D2 shown in Fig. 8, diode D28, diode D33 belong to rectifier diode.Wherein, direct current is female Line voltage U_DCOr DC voltage U_dcItself reforms into direct current after rectifier diode D2 rectifications.But line voltage U_BA、U_CB、 U_AC(or line voltage U_ba、U_cb、U_ac), it is still to hand over respectively after the corresponding rectifier diode in diode D28 and diode D33 Galvanic electricity.

Such as：Due to Rectitaction Diodes by Modifying (such as：Diode D2 shown in Fig. 8, diode D28 and triode D33) For same model, so, by comparing line voltage U_ba、U_cb、U_acThe filtered voltage of rectification and voltage division and DC voltage U_dc, wherein who It is big who be passed into comparator (such as：Comparator U27-D shown in Fig. 8) reverse side.

Such as：The regular situation of 750V is alreadyd exceed for busbar.By the way that suitable k is arranged₁And resistance R168, electricity The numerical value of resistance R173 is filtered before supply voltage sudden change but busbar voltage do not reach 750V setting values by line voltage rectification and voltage division Voltage value after wave reaches the protection point that sets up an office of 750V, and can also comparator be caused to act at this time, exports low level, locking triggering arteries and veins Punching is low level.

In a more optional specific example, first rectification module, can be used for the DC bus-bar voltage into Row rectification is handled.

In a more optional specific example, second rectification module can be used for carrying out rectification to the line voltage Processing.

In a more optional specific example, first partial pressure and filter module can be used in second rectification After module carries out rectification processing to the line voltage, is further divided and be filtered.

It is equipped with as a result, by the first rectification module, second rectification module and the first partial pressure and filter module, it can be with Rp input signal is selected for the inverting input of hysteresis loop comparator, selection mode is simple, and selection result is reliable.

In an optional specific example, the benchmark power supply circuit 132 can be used for the reference voltage according to setting, Same phase reference voltage is provided for the in-phase input end of the hysteresis loop comparator 133.

More optionally, the benchmark power supply circuit 132 may include：Second partial pressure and filter module (such as：By resistance The partial pressure and filter module that R169, resistance R171 and capacitance C84 are constituted).

In a more optional specific example, second partial pressure and filter module can be used for the base to setting Quasi- voltage (such as：Reference voltage+V_REF) divided and be filtered.

As a result, by the second partial pressure and filter module, same phase can be provided for the in-phase input end of the hysteresis loop comparator Reference voltage, simple in structure and reliability are high.

In an optional specific example, the hysteresis loop comparator 133 can be used for working as 133 institute of the hysteresis loop comparator Belong to whether the over-pressed detection unit 1 can be also used for DC bus-bar voltage caused by detection is mutated by the AC supply voltage Lower limit, the caused bus capacitor electricity of load unloading by the power module for falling below the first setting voltage range Bus capacitor voltage is caused by whether pressure sets the upper limit of voltage range, the load unloading by the power module more than second When no at least one of the lower limit for falling below the second setting voltage range, it is based on the same phase reference voltage, to described Reverse inter-input-ing voltage is compared with the first setting voltage range or the second setting voltage range, so that its output end the output phase is answered High level or low level, as it is described protection driving unit 2 needed for overvoltage protection signal.

Wherein, bus overvoltage and the bus overvoltage caused by loading Condition of Sudden Unloading caused by being mutated due to three phase mains are had Institute is different.Being mutated when three phase mains is mutated, between three-phase electricity has the time difference, and circuit just utilizes this of short duration time difference, and mutually electricity Press the coefficient setting of scale operation suitable, that is, UBA, UCB, UAC in Fig. 8 can be by the voltage after diode rectification Busbar reaches bus overvoltage protection before being more than 750V, protection triggering at this time is since phase voltage (supply voltage) variation causes Line voltage changes, and then trigger protection acts.And Condition of Sudden Unloading belongs to kinetic energy and is converted into electric energy, is stored in bus capacitor, busbar Capacitance voltage increases, and trigger protection acts the protection point (such as 750V) set after reaching afterwards.

Such as：In Fig. 8, if the value of the reverse side of comparator U27-D (is transmitted to the electricity of comparator U27-D reverse side Pressure) be more than preset threshold value, comparator U27-D will export low level, with drive signal shown in Fig. 9 (such as：Fig. 9 Shown in pulse signal UA_H_PULSE) carry out with operation (such as：Can by it is shown in Fig. 9 carry out with arithmetic unit U31-B with Operation), being equivalent to thyristor at this time does not have trigger signal, thyristor not to work, and busbar voltage will decline.

Such as：In Fig. 8, after busbar voltage declines to a certain extent, at this time since the output of comparator U27-D is low The in-phase end of level, comparator U27-D becomes a lower voltage value, after busbar voltage drops to a certain degree, at this time instead Phase end is less than in-phase end, and the output of comparator U27-D immediately can just be got higher in overturning, at this time drive signal (such as：It is shown in Fig. 9 Pulse signal UA_H_PULSE) with over-pressed signal (voltage for being transmitted to comparator U27-D reverse side) with operation again have It imitates.

Being equipped with by input selection circuit, benchmark power supply circuit and hysteresis loop comparator as a result, can be by straight The comparison of busbar voltage and line voltage is flowed, generates the overvoltage protection signal needed for the protection driving unit so that overvoltage protection The producing method of signal is easy, it is reliable to generate result.

Wherein, the over-pressed detection unit 1 is predicted is mutated caused DC bus-bar voltage by the AC supply voltage By more than the situation of the upper limit of the first setting voltage range, may include：The input selection circuit 131 is electric by the line Pressure is selected as the reverse inter-input-ing voltage of the inverting input of the hysteresis loop comparator 133.

Such as：Line voltage is compared with DC bus-bar voltage, is since as previously mentioned prominent occurs for supply voltage When the case where change, line voltage action can be faster than busbar voltage, this is because busbar voltage is obtained by three-phase mains voltage rectification , protection circuit will be protected in advance compared to traditional detection protection circuit, improve the reliability of whole system, reduce Damage to power device.

As a result, by when AC supply voltage is mutated, being determined according to line voltage caused by being mutated by AC supply voltage Whether DC bus-bar voltage will be more than the first setting voltage range, to realize to being mutated caused direct current by AC supply voltage It the look-ahead of busbar voltage and protects in advance, DC bus-bar voltage caused by ensure that being mutated by AC supply voltage carries out The promptness and reliability of overvoltage protection.

More optionally, the hysteresis loop comparator 133 may include：First comparator (such as：Comparator U27-D) and just Feedback module (such as：The positive feedback module being made of resistance R170 and resistance R172).

Such as：Fig. 8 is busbar voltage over-voltage detection circuit (i.e. bus overvoltage protection signal generation circuit).The busbar voltage The right side of over-voltage detection circuit be one by comparator (such as：The comparator or operational amplifier U27-D of model LM239) structure At hysteresis comparison circuit.

Wherein, the inverting input of the first comparator, the inverting input as the hysteresis loop comparator 133.Institute The in-phase input end for stating the second comparator, the in-phase input end as the hysteresis loop comparator 133.The first comparator it is defeated Outlet, the output end as the hysteresis loop comparator 133.

In a more optional specific example, the positive feedback module, be set to the output end of the first comparator with Between in-phase input end.

Such as：Precision voltage source (such as：Reference voltage+V shown in Fig. 8_REF), access amplifier (example is divided by circuit Such as：Comparator U27-D shown in Fig. 8) in-phase end (i.e. in-phase input end), while comparator (such as：Comparison shown in Fig. 8 Device U27-D) output by resistance (such as：Resistance R170 shown in Fig. 8) feed back to comparator (such as：Comparator shown in Fig. 8 U27-D in-phase end), this just constitutes a positive feedback, forms a hysteresis loop comparator.

Hysteresis loop comparator is formed by first comparator and being equipped with for positive feedback module as a result, it is simple in structure, and produce The stability of overvoltage protection signal needed for the raw protection driving unit is good, reliability is high.

Optionally, the over-pressed detection unit 1 can also include：Circuit 12 occurs for line voltage.

Wherein, circuit 12 occurs for the line voltage, may include：First input module 121,122 and of the second input module Second comparator 123 (such as：Comparator U25-A).

In an optional specific example, first input module 121 can be used for second comparator 123 Inverting input input the first phase voltage in the AC supply voltage.

More optionally, first input module 121 may include：Third divide and filter module (such as：By resistance The partial pressure and filter module that R126, resistance R1144 and capacitance C86 are constituted).

In a more optional specific example, the third partial pressure and filter module can be used for first phase electricity Pressure is divided and is filtered.

As a result, by third partial pressure and filter module, the first phase voltage is divided and is filtered, the can be promoted The stability and reliability of one phase voltage.

In an optional specific example, second input module 122 can be used for second comparator 123 In-phase input end input the second phase voltage in the AC supply voltage.

More optionally, second input module 122 may include：4th partial pressure and filter module (such as：By resistance The partial pressure and filter module that R165, capacitance C87 and resistance R166 are constituted).

Such as：Resistance R126's, resistance R114, resistance R165 and resistance R166 in calculus of differences circuit shown in Fig. 7 Resistance value is equal.

In a more optional specific example, the 4th partial pressure and filter module can be used for the two phase electricity Pressure is divided and is filtered.

As a result, by the 4th partial pressure and filter module, the second phase voltage is divided and is filtered, the can be promoted The stability and reliability of two-phase voltage.

In an optional specific example, second comparator 123 can be used for first phase voltage and described After second phase voltage carries out calculus of differences processing, first phase voltage and the corresponding line voltage of second phase voltage are exported.

Such as：Three-phase mains voltage obtains line by calculus of differences circuit (i.e. circuit occurs for line voltage) as shown in Figure 7 Voltage, respectively U_ba、U_cb、U_ac。

Such as：Line voltage shown in Fig. 7 occurs in circuit, and comparator U25-A is an operational amplifier, resistance R126, electricity It hinders in R165, resistance R166, resistance R114, R126 and the same resistance values of R165, R114 and the same resistance values of R116.Capacitance C86 and capacitance C87 can be patch capacitor, for filtering.The input voltage U of circuit occurs for the line voltage_AAnd U_BAnd output voltage U_BAIt Between operation it is as follows：

Being equipped with by the first input module, the second input module and the second comparator as a result, can be by two phases Voltage is converted to a corresponding line voltage, and conversion regime is easy, and transformation result is reliable.

Optionally, the over-pressed detection unit 1 can also include：Voltage ratio scales circuit 11.

Wherein, the voltage ratio scales circuit 11, may include：Division module 111 (such as：By resistance R164 and electricity Hinder the division module 111 that R134 is constituted) and voltage follower 112 (such as：Comparator U22-A).

Such as：Voltage ratio shown in fig. 6 scales circuit, can be that electric resistance partial pressure and level-one follow circuit.

In an optional specific example, the division module 111 can be used for the voltage scaling ratio in setting, right Wait for that scaled voltage carries out voltage division processing.Wherein, described to wait for scaled voltage, may include：The phase voltage and/or the direct current are female Line voltage.

Such as：Phase voltage U_A、U_B、U_CAnd DC bus-bar voltage U_DC, obtained by voltage ratio shown in fig. 6 scaling circuit To U_a、U_b、U_cAnd U_dc。

More optionally, the division module 111 may include：First divider resistance and the second divider resistance, described first Divider resistance, which is arranged, to be waited for described between scaled voltage and the in-phase input end of the voltage follower 112, second partial pressure Resistance is arranged between the in-phase input end and ground of the voltage follower 112.

Such as：Phase voltage U_A、U_B、U_CAnd DC bus-bar voltage U_DCIn any voltage, pass through the first divider resistance (example Such as：Resistance R164) and the second divider resistance (such as：Resistance R134) voltage signal that electric resistance partial pressure obtains is carried out, through overvoltage Follower (such as：Comparator or operational amplifier U22-A) it carries out voltage order one and follows processing, it is electric to enhance partial pressure gained Press the stability of signal.

It is divided as a result, by the first divider resistance and being equipped with for the second divider resistance, partial pressure reliability is high, pacifies Quan Xingqiang.

In a more optional specific example, the resistance value of first divider resistance is higher than the resistance of second divider resistance Value setting Standard resistance range.

Such as：The resistance value that voltage ratio shown in Fig. 6 scales the resistance R164 specific resistances R134 in circuit is much higher.

As a result, by the way that the resistance value ratio of the first divider resistance and the second divider resistance is arranged, voltage scaling ratio can be controlled Example, flexibility is good, reliability is high.

In a more optional specific example, the voltage scaling ratio for waiting for scaled voltage may include：Described second The resistance value of divider resistance accounts for the ratio of the sum of resistance value of first divider resistance and second divider resistance.

Such as：The input voltage U of voltage ratio scaling circuit shown in fig. 6_inWith output voltage U_{_out}Between operation It is as follows：

As a result, by the way that the resistance value that voltage scaling ratio setting is the second divider resistance is accounted for the first divider resistance and second point The ratio of the sum of the resistance value of piezoresistance so that reliable to method of determination simplicity, the definitive result of voltage scaling ratio.

In a more optional specific example, the voltage scaling ratio of the phase voltage, with the DC bus-bar voltage Voltage scaling ratio differs.

Such as：In voltage ratio scaling circuit shown in fig. 6, power supply phase voltage (such as：Phase voltage U_A、 U_B、U_C) and DC bus-bar voltage (DC bus-bar voltage U_DC) scaling it is different.Such as：Assuming that by circuit shown in fig. 6, by respective After scaling carries out operation, it can obtain：

U_x=k₁U_XX=a, b, c X=A, B, C (1)；

U_dc=k₂U_DC (2)。

As a result, by waiting for that scaled voltage is zoomed in and out by different voltages scaling to difference, can obtain respectively required Voltage so that the flexibility of scaling processing is good, versatile.

In an optional specific example, the voltage follower 112 can be used in the division module 111 to institute After stating phase voltage and/or DC bus-bar voltage progress voltage division processing, further carries out voltage order one and follow processing, obtain institute State the DC bus-bar voltage of 131 input side of input selection circuit, and/or any phase of line voltage generation 12 input side of circuit Voltage.

Such as：DC voltage U_dc(such as：Voltage ratio scales circuit to DC bus-bar voltage U as shown in Figure 6_DCCarry out electricity The DC voltage U that pressure ratio example scaling processing obtains_dc), by rectifier diode (such as：Bus overvoltage protection signal shown in Fig. 8 is produced Diode D2 in raw circuit) after rectification, be directly connected to comparator (such as：Comparator U27-D shown in Fig. 8) reverse side (i.e. inverting input).

Such as：The line voltage U that circuit progress calculus of differences obtains occurs for line voltage as shown in Figure 7_ba、U_cb、 U_ac, pass through two Pole pipe (such as：Diode D28 and triode D33 in the generation circuit of bus overvoltage protection signal shown in Fig. 8) rectification, and lead to Cross divider filter (such as：It is divided by resistance R168 shown in Fig. 8 and resistance R173, passes through capacitance C85 shown in Fig. 8 Be filtered) after, be connected to comparator (such as：Comparator U27-D shown in Fig. 8) reverse side.

Being equipped with by division module and voltage follower as a result, can to DC bus-bar voltage, phase voltage etc. into The processing of row proportional zoom scales excessively simplicity, and scaled results stability is good, reliable to obtain the voltage of required voltage range Property it is high.

More optionally, at least one of second comparator 123 and the voltage follower 112 may include：It is double Power supply power supply operational amplifier.

Such as：Voltage ratio shown in Fig. 6 scales the operational amplifier used in the circuit of line voltage generation shown in circuit and Fig. 7 (such as：Comparator in Fig. 6 or the comparator in operational amplifier U22-A, Fig. 7 or operational amplifier U25-A), can be Dual power supply operational amplifier.

As a result, by using dual power supply operational amplifier, can be promoted respective handling acquired results accuracy and Stability.

In an optional example, the protection driving unit 2 can be used for predicting in the over-pressed detection unit 1 DC bus-bar voltage caused by being mutated by the AC supply voltage will be more than the feelings of the upper limit of the first setting voltage range Under condition, the protection act of setting is executed.The concrete function of the protection driving unit 2 and processing are referring to step S120.

Such as：Busbar voltage over-voltage detection circuit, can in advance to cause because of supply voltage sudden change overvoltage situation into Row is effectively protected.

To be more than as a result, the first setting voltage by the DC bus-bar voltage caused by being mutated by AC supply voltage Overvoltage protection is carried out when the upper limit of range in advance, it can be effective to causing the situation of overvoltage to carry out because of supply voltage sudden change in advance Ground is protected, and the promptness and reliability of protection are promoted.

Optionally, the protection act for executing setting may include：Turn off the driving letter of rectification circuit in the power module Number (such as：The scr rectification circuit in the power module is set to be stopped).

Wherein, the rectification circuit can be used for carrying out rectification to the AC supply voltage, obtain the DC bus Voltage.

As a result, overvoltage protection is realized by turning off the drive signal of rectification circuit so that the mode of overvoltage protection is easy, and It can ensure the safety of rectification circuit.

More optionally, the rectification circuit may include：Scr rectification circuit.The drive of the scr rectification circuit Signal is moved, may include：Thyristor driver signal.

Rectification is carried out by thyristor as a result, control mode is easy and reliability is high.

Optionally, the protection driving unit 2 may include：Drive signal amplifying circuit 21.

Wherein, the drive signal amplifying circuit 21 may include：With computing circuit 211 (such as：With door U31-B) and Driving circuit 212.

In an optional specific example, described and computing circuit 211 can be used for when the over-pressed detection unit 1 can It is when including hysteresis loop comparator 133, the drive signal of rectification circuit in the power module and the hysteresis loop comparator 133 is defeated The overvoltage protection signal gone out is carried out with after operation, and can output can be used for controlling the driving circuit 212 make the drive The control signal that dynamic signal is effectively driven.

More optionally, can the output of described and computing circuit 211 can be used for controlling the driving circuit 212 make the drive The control signal that signal is effectively driven is moved, may include：It is described in the case where the overvoltage protection signal is high level Control signal is high level, needs to cancel the protection act；Or in the case that the overvoltage protection signal be low level, institute It is low level to state control signal, needs to execute the protection act.

As a result, by the case where DC bus-bar voltage i.e. will be over-pressed or over-pressed, making to export with computing circuit low Level, to turn off the drive signal of rectification circuit；Being had been lowered in DC bus-bar voltage will not i.e. will be over-pressed or over-pressed In the case of, make to export high level with computing circuit, to open the drive signal of rectification circuit so that believe the driving of rectification circuit Number it is easy to control and reliable.

In an optional specific example, the driving circuit 212 can be used for exporting with computing circuit 211 described The control signal control under, to the drive signal carry out in vain driving or effectively driving, with realize to the protection The execution of action or the corresponding control of cancellation.

Wherein, it when the driving circuit 212 drives the drive signal in vain, may be implemented to the protection Action executes control.When the driving circuit 212 effectively drives the drive signal, may be implemented to the guarantor Shield action is removed controls.

Such as：Driving circuit shown in Fig. 9, is drive signal amplifying circuit, and U31-B is one and door, when be input to When two signals of door U31-B are high level simultaneously, output is just high level.OV-FLAG is overvoltage protection signal, mistake In the case of pressure, OV_FLAG is low level, and drive signal is with regard to invalid at this time.U30 is driving chip, and main effect is will to drive Dynamic signal carries out power amplification, it is sufficient to drive turn on thyristors.

As a result, by being equipped with computing circuit and driving circuit, rectification circuit controlled according to overvoltage protection signal Shutdown or unlatching, control mode is easy, and the reliability of control result is high, high safety.

More optionally, the driving circuit 212 may include：Driving chip (such as：Driving chip U30) and protection mould Block (such as：The protection module being made of diode D34, resistance R179 and capacitance C88).

In a more optional specific example, the driving chip can be used in the control signal being high level In the case of, power amplification processing is carried out to the drive signal, to realize effective driving to the drive signal.In the control In the case of signal processed is low level, the drive signal is turned off, to realize the invalid driving to the drive signal.

In a more optional specific example, the protection module can be used in the driving chip to the driving After signal carries out power amplification processing, pressure limiting and/or current limliting processing are further carried out.

Wherein, the diode in Fig. 9 after driving chip be limit trigger pulse voltage voltage value, be limited to+VRER and Between zero level；The effect of resistance is current limliting, and excessive circuit damage thyristor, the trigger current of thyristor is prevented to should not be too large Also unsuitable too small, excessive thyristor is easily damaged, and too small thyristor driver is not；Capacitance only serves the effect of filtering.

Rectification circuit is driven by driving chip and protection module as a result, so as to rectification circuit drive signal Reliability height, the high safety of control.

In an optional example, the overvoltage detection unit 1 can be also used for (after executing the protection act) Whether DC bus-bar voltage caused by detection is mutated by the AC supply voltage falls below the first setting voltage model The lower limit enclosed.The concrete function of the overvoltage detection unit 1 and processing are referring further to step S210.

In an optional example, the protection driving unit 2 can be also used for being mutated by the AC supply voltage In the case that caused DC bus-bar voltage falls below the lower limit of the first setting voltage range, it is dynamic to cancel the protection Make.The concrete function of the protection driving unit 2 and processing are referring further to step S220.

Such as：Busbar voltage over-voltage detection circuit, can in advance to cause because of supply voltage sudden change overvoltage situation into Row is effectively protected；And upon actuation, when supply voltage reduces to a certain degree, rectification circuit can restore normal work automatically Make, is unlikely to entire Electrical Towage Control Systems and shuts down, it is effective rapidly to the protection of whole system, enhance entire Electric Traction The security reliability of control system.

As a result, by advance to cause because of supply voltage sudden change overvoltage situation effectively protect after, DC bus-bar voltage caused by being mutated by the AC supply voltage falls below the lower limit of the first setting voltage range When cancel overvoltage protection, on the one hand ensure that cause because of supply voltage sudden change overvoltage situation carry out overvoltage protection it is timely Property and reliability, on the other hand also ensure makes power supply mould after the situation for leading to overvoltage because of supply voltage sudden change restores normal Block, Electrical Towage Control Systems wait for protected object that can resume operation in time and reliably.

Optionally, when the protection driving unit 2 can be also used for cancelling the protection act, it is dynamic to cancel the protection Make, may include：Open rectification circuit in the power module the drive signal (such as：Make in the power module Scr rectification circuit is resumed work).

As a result, cancelling protection act by way of opening the drive signal of rectification circuit, mode of operation is easy, and operates Result reliability is high.

In an optional example, the overvoltage detection unit 1 can be also used for detecting by the load of the power module Whether bus capacitor voltage caused by unloading sets the upper limit of voltage range more than second.The specific work(of the overvoltage detection unit 1 It can and handle referring further to step S310.

Wherein, caused by the over-pressed detection unit 1 can be also used for detecting the load unloading by the power module When whether bus capacitor voltage sets the upper limit of voltage range more than second, the second setting voltage range, with described first It is identical to set voltage range.

Such as：As the Upper threshold of hysteresis comparison circuit and Lower Threshold since power supply is mutated with load Condition of Sudden Unloading be. Difference is that busbar sample circuit is different with the ratio setting of phase voltage sample circuit, will make to draw due to supply voltage sudden change The busbar voltage risen increases the advancement before setting protection point (such as 750V).This protection act due to UBA in Fig. 8, Caused by UCB, UAC are after divider filter, busbar voltage not yet arrives protection point at this time.Only line caused by supply voltage sudden change The bus overvoltage for after voltage filtering after voltage commutation being more than setting protects point.

As a result, by the way that different overvoltage protection voltage ranges is arranged in different overvoltage protection control, can be adapted for The overvoltage protection of a variety of occasions controls, and flexibility is good, versatile.

In an optional example, the protection driving unit 2 can be also used for unloading in the load by the power module In the case that bus capacitor voltage caused by carrying has been more than the upper limit of the second setting voltage range, the protection for executing setting is dynamic Make.The concrete function of the protection driving unit 2 and processing are referring further to step S320.

It has been more than as a result, the upper of the second setting voltage range by the bus capacitor voltage caused by being unloaded by load Protection act is executed in limited time, and the overvoltage protection for treating protected object bus capacitor voltage caused by loading unloading may be implemented, Protected mode is easy, protection result reliability is high.

Wherein, the over-pressed detection unit 1 detects bus capacitor electricity caused by the load unloading by the power module Pressure has been more than the situation of the upper limit of the second setting voltage range, may include：The input selection circuit 131 will be described straight Stream busbar voltage is selected as the reverse inter-input-ing voltage of the inverting input of the hysteresis loop comparator 133.

As a result, by when loading unloading, determining that bus capacitor caused by being unloaded by load is electric according to DC bus-bar voltage Whether pressure will be more than the second setting voltage range, to realize that the overvoltage to the bus capacitor voltage caused by load unloading is protected Shield, bus capacitor voltage caused by ensure that being unloaded by load carry out the promptness and reliability of overvoltage protection.

In an optional example, the overvoltage detection unit 1 can be also used for detecting by the load of the power module Whether bus capacitor voltage caused by unloading falls below the lower limit of the second setting voltage range.The overvoltage detection unit 1 Concrete function and processing are referring further to step S410.

Wherein, in the over-pressed detection unit 1, the hysteresis loop comparator 133 make itself output end output high level or Low level may include following at least one situation：

(1) the upper limit of the first setting voltage range or the second setting electricity are less than in the reverse inter-input-ing voltage In the case of the upper limit for pressing range, output end is made to export high level.

(2) it is more than described first upper limit for setting voltage range or the second setting voltage in the reverse inter-input-ing voltage In the case of the upper limit of range, make to jump to low level under the high level of the output end.

(3) it is reduced in the reverse inter-input-ing voltage and is not below the described first lower limit or described second for setting voltage range In the case of the lower limit for setting voltage range, the output end is made to keep the low level.

(4) fall below the lower limit of the first setting voltage range in the reverse inter-input-ing voltage or described second set In the case of the lower limit of constant voltage range, make high level described in rebound in the low level of the output end.

Such as：The reverse side input voltage v of comparator U27-D from Fig. 8_I=0, comparator (such as：Ratio shown in Fig. 8 Compared with device U27-D) output voltage v₀=V_OHWith in-phase end voltage v_P=V_T+Start to analyze.Work as v_IBy v_I=0 increases to positive direction Close to v_P=V_T+Before, v₀It is always maintained at v₀=V_OHIt is constant.Work as v_IIncrease to and is slightly larger than v_P=V_T+, then v₀By V_OHUnder jump to V_OL, together When make v_PUnder jump to v_P=V_T-, v_IIt is further added by, v₀Keep v₀=V_OLIt is constant.

If reducing v_IAs long as v_I＞ v_P=V_T-, then v₀It will remain v₀=V_OLIt is constant, only work as v_I＜ v_P=V_T-When, v₀ Just by V_OLJump to V_OH。

To calculate below comparator in this circuit (bus overvoltage protection signal generation circuit i.e. shown in Fig. 8) (such as： Comparator U27-D shown in Fig. 8) the voltage limit V that visits_T+With lower threshold voltage V_T-, can be obtained by Kirchhoff's current law (KCL)：

Respectively by v₀=V_OH=+V_REFAnd v_o=V_OL=0 substitutes into formula (4), can be in the hope of the high and low thresholds of hysteresis loop comparator V_T+And V_T-。V_T+Correspondence is 750V over-voltage protection points, V_T-The corresponding minimum bus voltage for capableing of normal operation for 380V motors.

Such as：Busbar voltage changes from 0-750V, comparator (such as：Comparator U27-D shown in Fig. 8) output be V_OHFor high level, with the pulse signal of thyristor do be passed into after operation driving chip (such as：Driving chip shown in Fig. 9 U30), the driving capability of intensifier pulse, as shown in Figure 9.Busbar voltage is more than 750V, at this time comparator (such as：It is shown in Fig. 8 Comparator U27-D) reverse phase terminal potential v_IHigher than in-phase end v_P, comparator (such as：Comparator U27-D shown in Fig. 8) output it is low Level, with driving pulse (such as：Pulse signal UA_H_PULSE shown in Fig. 9) with operation after encourage thyristor pulse (example Such as：Thyristor pumping signal SCR2 shown in Fig. 9) it is lasting level, three-phase commutation bridge does not work.Then, busbar voltage is opened Begin to decline, after dropping to 380V, comparator (such as：Comparator U27-D shown in Fig. 8) in-phase end current potential v_PHigher than reverse side Current potential v_I, comparator (such as：Comparator U27-D shown in Fig. 8) reversion output high level, driving circuit (i.e. Fig. 9 institutes at this time The driving circuit shown) it can work normally.

Hysteresis loop comparator output end is set to export high level or low level by the variation of DC bus-bar voltage as a result, in turn Realize the execution to the action of the overvoltage protection of DC bus-bar voltage or remove controls, on the one hand ensure that overvoltage protection control and On the other hand when property and reliability ensure that reliability and the safety of object normal work to be protected.

In an optional example, the protection driving unit 2 can be also used for unloading in the load by the power module In the case that bus capacitor voltage caused by carrying falls below the lower limit of the second setting voltage range, cancel the protection Action acts.The concrete function of the protection driving unit 2 and processing are referring further to step S420.

Such as：To overcome the shortcomings of existing Electrical Towage Control Systems median generatrix electric voltage over press guard method, increase by one Layer protection, can be effective other than conventional overvoltage crowbar by the overvoltage crowbar of scr rectification circuit It predicts busbar voltage overvoltage caused by supply voltage sudden change, and then takes safeguard measure in advance.

Such as：The busbar voltage overvoltage crowbar not only can effectively prevent bus overvoltage caused by load Condition of Sudden Unloading, It can also effectively prevent to cause because of supply voltage sudden change busbar voltage over-pressed, be not to make motor stopping, further enhance pair The protection of semiconductor power component, the relatively reliable safety of system operation.

As a result, by detecting that unloading caused bus capacitor voltage by load falls below the second setting voltage Cancel overvoltage protection when the lower limit of range, power module to be protected or Electrical Towage Control Systems can be made to restore normal work Make, not only high safety, it is ensured that the reliability of object work to be protected.

The overvoltage protection of scr rectification circuit is passed through using the technical solution of the present embodiment through a large amount of verification experimental verification Busbar voltage overvoltage caused by supply voltage sudden change can be effectively predicted other than conventional overvoltage crowbar in circuit, And then safeguard measure is taken in advance, improve the promptness and reliability of protection.

Embodiment according to the present utility model additionally provides a kind of power module corresponding to over-pressure safety device.The electricity Source module may include：Rectification circuit；Can also include：Above-described over-pressure safety device.

Wherein, the over-pressure safety device, be arranged between AC power and the rectification circuit, can be used for by for The rectification circuit provides effective or invalid drive signal, realizes to the rectification circuit and/or power module institute band The overvoltage protection of load.

The processing and function realized by the power module of the present embodiment essentially correspond to earlier figures 4 to shown in Fig. 9 Embodiment, principle and the example of over-pressure safety device, therefore not detailed place in the description of the present embodiment, may refer to aforementioned implementation Related description in example, this will not be repeated here.

Busbar voltage over-voltage detection circuit, energy are passed through using the technical solution of the utility model through a large amount of verification experimental verification Enough to be effectively protected in advance to the situation for leading to overvoltage because of supply voltage sudden change, reliability is high, and safety is good.

Embodiment according to the present utility model additionally provides a kind of Electrical Towage Control Systems corresponding to power supply.The electricity Power drive control system may include：Above-described power module.

In an optional embodiment, to overcome existing Electrical Towage Control Systems median generatrix electric voltage over press protection side The deficiency of method, increases by one layer of protection, and the utility model patent provides a kind of overvoltage crowbar of scr rectification circuit, removes Other than conventional overvoltage crowbar, busbar voltage overvoltage, Jin Erti caused by supply voltage sudden change can be effectively predicted Before take safeguard measure.

It preferably, can be in advance to because of electricity the utility model proposes a kind of novel busbar voltage over-voltage detection circuit Source voltage jump and cause overvoltage situation effectively protect；And upon actuation, when supply voltage reduces to a certain degree When, rectification circuit can restore to work normally automatically, be unlikely to entire Electrical Towage Control Systems and shut down, to the guarantor of whole system Shield is rapid effective, enhances the security reliability of entire Electrical Towage Control Systems.

In an optional example, when it is implemented, phase voltage U first_A、U_B、U_CAnd DC bus-bar voltage U_DC, pass through Voltage ratio scaling circuit shown in fig. 6 obtains U_a、U_b、U_cAnd U_dc。

Wherein, the resistance value of the resistance R164 specific resistances R134 in the scaling of voltage ratio shown in Fig. 6 circuit is much higher.Mutually electricity Press U_A、U_B、U_CAnd DC bus-bar voltage U_DCIn any voltage, by the first divider resistance (such as：Resistance R164) and the Two divider resistances (such as：Resistance R134) carry out the obtained voltage signal of electric resistance partial pressure, by voltage follower (such as：Compare Device or operational amplifier U22-A) carry out voltage order one follow processing, to enhance partial pressure obtained by voltage signal stability.

Specifically, voltage ratio shown in fig. 6 scales circuit, can be that electric resistance partial pressure and level-one follow circuit.The electricity Press the input voltage U of scaling circuit_inWith output voltage U_{_out}Between operation it is as follows：

Further, herein power supply phase voltage (such as：Phase voltage U_A、U_B、U_C) and DC bus-bar voltage (DC bus electricity Press U_DC) scaling it is different.Such as：It, can be with after carrying out operation by respective scaling assuming that by circuit shown in fig. 6 It obtains：

U_x=k₁U_XX=a, b, c X=A, B, C (1)；

U_dc=k₂U_DC (2)。

In an optional example, by calculus of differences circuit as shown in Figure 7, (i.e. line voltage occurs three-phase mains voltage Circuit), obtain line voltage, respectively U_ba、U_cb、U_ac。

Wherein, the resistance R126 in calculus of differences circuit shown in Fig. 7, resistance R114, resistance R165 and resistance R166 Resistance value is equal.

Specifically, line voltage shown in Fig. 7 occurs in circuit, and comparator U25-A is an operational amplifier, resistance R126, In resistance R165, resistance R166, resistance R114, R126 and the same resistance values of R165, R114 and the same resistance values of R116.Capacitance C86 and capacitance C87 can be patch capacitor, for filtering.The input voltage U of circuit occurs for the line voltage_AAnd U_BAnd output voltage U_BAIt Between operation it is as follows：

Optionally, voltage ratio shown in Fig. 6 scales the operational amplifier used in the circuit of line voltage generation shown in circuit and Fig. 7 (such as：Comparator in Fig. 6 or the comparator in operational amplifier U22-A, Fig. 7 or operational amplifier U25-A), can be Dual power supply operational amplifier.

In an optional example, Fig. 8 is that (i.e. bus overvoltage protection signal generates electricity to busbar voltage over-voltage detection circuit Road).The right side of the busbar voltage over-voltage detection circuit be one by comparator (such as：The comparator or fortune of model LM239 Calculate amplifier U27-D) constitute hysteresis comparison circuit.

Specifically, busbar voltage over-voltage detection circuit shown in Fig. 8 belongs to bus overvoltage hysteresis comparison circuit, concrete principle ginseng It sees detailed description below.

Diode D2 shown in Fig. 8, diode D28, diode D33 belong to rectifier diode.Wherein, DC bus-bar voltage U_DCOr DC voltage U_dcItself reforms into direct current after rectifier diode D2 rectifications.But line voltage U_BA、U_CB、U_AC(or Line voltage U_ba、U_cb、U_ac), it is still exchange respectively after the corresponding rectifier diode in diode D28 and diode D33 Electricity.

Wherein, referring to Fig. 8, for tri- line voltages of UBA, UCB, UAC, diode has the function of rectification；Busbar Direct current, add diode effect be exactly and line voltage rectification after out voltage be compared, who greatly who be fed to than Compared with the reverse side of device, inputted as effective comparison voltage.Optionally, diode is if common cathode, whose big so-and-so of anode Conducting.

Further, in the reverse side of comparator U27-D, DC bus-bar voltage U_DCAfter rectifier diode D2, with line Voltage U_BA、U_CB、U_ACVoltage after rectified divider filter is compared, who it is big who will be transmitted to the reverse phase of comparator U27-D End；If the value (voltage for being transmitted to comparator U27-D reverse side) is more than preset threshold value, comparator U27-D is just Low level can be exported, with drive signal shown in Fig. 9 (such as：Pulse signal UA_H_PULSE shown in Fig. 9) carry out and operation (such as：Can be by the way that shown in Fig. 9 and arithmetic unit U31-B is carried out and operation), being equivalent to thyristor at this time does not have trigger signal, Thyristor does not work, and busbar voltage will decline.After busbar voltage declines to a certain extent, at this time due to comparator U27-D Output be low level, the in-phase end of comparator U27-D becomes a lower voltage value, when busbar voltage drops to a certain degree Afterwards, reverse side is less than in-phase end at this time, and the output of comparator U27-D immediately can just be got higher in overturning, at this time drive signal (such as： Pulse signal UA_H_PULSE shown in Fig. 9) it is carried out with over-pressed signal (voltage for being transmitted to comparator U27-D reverse side) It is again effective with operation.

Wherein, line voltage is compared with DC bus-bar voltage, is since as previously mentioned prominent occurs for supply voltage When the case where change, line voltage action can be faster than busbar voltage, this is because busbar voltage is obtained by three-phase mains voltage rectification , protection circuit will be protected in advance compared to traditional detection protection circuit, improve the reliability of whole system, reduce Damage to power device.

Optionally, DC voltage U_dc(such as：Voltage ratio scales circuit to DC bus-bar voltage U as shown in Figure 6_DCIt carries out The DC voltage U that voltage ratio scaling processing obtains_dc), by rectifier diode (such as：Bus overvoltage protection signal shown in Fig. 8 Diode D2 in generation circuit) after rectification, be directly connected to comparator (such as：Comparator U27-D shown in Fig. 8) reverse phase It holds (i.e. inverting input).

Optionally, the line voltage U that circuit progress calculus of differences obtains occurs for line voltage as shown in Figure 7_ba、U_cb、 U_ac, pass through Diode (such as：Diode D28 and triode D33 in the generation circuit of bus overvoltage protection signal shown in Fig. 8) rectification, and By divider filter (such as：It is divided by resistance R168 shown in Fig. 8 and resistance R173, passes through capacitance shown in Fig. 8 C85 is filtered) after, be connected to comparator (such as：Comparator U27-D shown in Fig. 8) reverse side.

Wherein, due to Rectitaction Diodes by Modifying (such as：Diode D2 shown in Fig. 8, diode D28 and triode D33) For same model, so, by comparing line voltage U_ba、U_cb、U_acThe filtered voltage of rectification and voltage division and DC voltage U_dc, wherein who It is big who be passed into comparator (such as：Comparator U27-D shown in Fig. 8) reverse side.

Optionally, precision voltage source (such as：Reference voltage+V shown in Fig. 8_REF), access amplifier (example is divided by circuit Such as：Comparator U27-D shown in Fig. 8) in-phase end (i.e. in-phase input end), while comparator (such as：Comparison shown in Fig. 8 Device U27-D) output by positive feedback resistor (such as：Resistance R170 shown in Fig. 8) feed back to comparator (such as：It is shown in Fig. 8 Comparator U27-D) in-phase end, this just constitutes a positive feedback, forms a hysteresis loop comparator.

Here, since the virtual value of power grid three-phase voltage is 220V, 540V is obtained by rectifier bridge rectification, according to busbar electricity Hold and the specifications and models of power component, design over-voltage protection point be easy to cause busbar Support Capacitor in 750V more than 750V With the damage of power component.In view of the excessive often of short duration state of busbar voltage, so it is improper directly to shut down operation 's.Busbar voltage cannot be too low, and the too low motor that will also result in of busbar voltage cannot run well, and the point is selected according to actual conditions Voltage, it is assumed here that be 380V, just obtained the high and low thresholds of hysteresis loop comparator here.Such as：When busbar be more than 750V or Line voltage envelope moment is more than certain value, will protect circuit operation, close the trigger pulse of thyristor, when busbar voltage is low After 380V, the trigger pulse of thyristor can normally be sent out.

Wherein, from reverse side input voltage v_I=0, comparator (such as：Comparator U27-D shown in Fig. 8) output voltage v₀=V_OHWith in-phase end voltage v_P=V_T+Start to analyze.Work as v_IBy v_I=0 increases to positive direction close to v_P=V_T+Before, v₀Always Keep v₀=V_OHIt is constant.Work as v_IIncrease to and is slightly larger than v_P=V_T+, then v₀By V_OHUnder jump to V_OL, while making v_PUnder jump to v_P=V_T-, v_I It is further added by, v₀Keep v₀=V_OLIt is constant.

If reducing v_IAs long as v_I＞ v_P=V_T-, then v₀It will remain v₀=V_OLIt is constant, only work as v_I＜ v_P=V_T-When, v₀ Just by V_OLJump to V_OH。

To calculate below comparator in this circuit (bus overvoltage protection signal generation circuit i.e. shown in Fig. 8) (such as：Figure Comparator U27-D shown in 8) the voltage limit V that visits_T+With lower threshold voltage V_T-, can be obtained by Kirchhoff's current law (KCL)：

Respectively by v₀=V_OH=+V_REFAnd v_o=V_OL=0 substitutes into formula (4), can be in the hope of the high and low thresholds of hysteresis loop comparator V_T+And V_T-。V_T+Correspondence is 750V over-voltage protection points, V_T-The corresponding minimum bus voltage for capableing of normal operation for 380V motors.

In an optional example, busbar voltage changes from 380V-750V, comparator (such as：Comparator shown in Fig. 8 U27-D output) is V_OHFor high level, with the pulse signal of thyristor do be passed into after operation driving chip (such as：Fig. 9 Shown in driving chip U30), the driving capability of intensifier pulse, as shown in Figure 9.Busbar voltage is more than 750V, at this time comparator (such as：Comparator U27-D shown in Fig. 8) reverse phase terminal potential v_IHigher than in-phase end v_P, comparator (such as：Ratio shown in Fig. 8 Compared with device U27-D) output low level, with driving pulse (such as：Pulse signal UA_H_PULSE shown in Fig. 9) with encouraged after operation Thyristor pulse (such as：Thyristor pumping signal SCR2 shown in Fig. 9) it is lasting level, three-phase commutation bridge does not work. Then, busbar voltage is begun to decline, after dropping to 380V, comparator (such as：Comparator U27-D shown in Fig. 8) in-phase end Current potential v_PHigher than reverse phase terminal potential v_I, comparator (such as：Comparator U27-D shown in Fig. 8) reversion output high level, drives at this time Dynamic circuit (driving circuit i.e. shown in Fig. 9) can work normally.

Specifically, driving circuit shown in Fig. 9, is drive signal amplifying circuit, and U31-B is one and door, when being input to When two signals with door U31-B are high level simultaneously, output is just high level.OV-FLAG is overvoltage protection signal, In the case of overvoltage, OV_FLAG is low level, and drive signal is with regard to invalid at this time.U30 is driving chip, it is main effect be by Drive signal carries out power amplification, it is sufficient to drive turn on thyristors.

The above analysis is the regular situation that 750V is alreadyd exceed for busbar.By the way that suitable k is arranged₁And resistance The numerical value of R168, resistance R173, it is whole by line voltage before supply voltage sudden change but busbar voltage do not reach 750V setting values Voltage value after stream divider filter reaches the protection point that sets up an office of 750V, and can also comparator be caused to act at this time, export low level, lock It is low level to determine trigger pulse.

By the above measure, which not only can effectively prevent female caused by load Condition of Sudden Unloading Line overvoltage, moreover it is possible to effectively prevent to cause busbar voltage over-pressed because of supply voltage sudden change, be not to make motor stopping, further increase The strong protection to semiconductor power component, the relatively reliable safety of system operation.

The processing and function realized by the Electrical Towage Control Systems of the present embodiment essentially correspond to aforementioned power source mould Embodiment, principle and the example of block, therefore not detailed place in the description of the present embodiment, may refer to the correlation in previous embodiment Illustrate, this will not be repeated here.

Through a large amount of verification experimental verification, using the technical solution of the utility model, after being acted in execution overvoltage protection, When supply voltage reduces to a certain degree, rectification circuit can restore to work normally automatically, be unlikely to entire Electric Traction control System-down, it is effective rapidly to the protection of whole system, enhance the security reliability of entire Electrical Towage Control Systems.

Embodiment according to the present utility model additionally provides a kind of Electric Traction control corresponding to Electrical Towage Control Systems The over-voltage protection method of system processed, the flow signal of an embodiment of the over-voltage protection method of the utility model as shown in Figure 10 Figure.The over-voltage protection method of the Electrical Towage Control Systems may include：

At step S110, in the DC bus caused by the mutation of the AC supply voltage of power module input side to be protected Before voltage is less than the upper limit of the first setting voltage range, predict whether the DC bus-bar voltage will be more than first setting The upper limit of voltage range.

Wherein, first voltage range is set, may include：380V~750V.

As a result, for example：Since the virtual value of power grid three-phase voltage is 220V, 540V is obtained by rectifier bridge rectification, according to The specifications and models of bus capacitor and power component, design over-voltage protection point be easy to cause busbar branch in 750V more than 750V Support the damage of capacitance and power component.In view of the excessive often of short duration state of busbar voltage, run so directly shutting down It is improper.Busbar voltage cannot be too low, and the too low motor that will also result in of busbar voltage cannot run well, and be selected according to actual conditions Select the voltage, it is assumed here that be 380V, just obtained the high and low thresholds of hysteresis loop comparator here.Such as：When busbar is more than 750V or line voltage envelope moment are more than certain value, will protect circuit operation, close the trigger pulse of thyristor, work as mother After line voltage is less than 380V, the trigger pulse of thyristor can normally be sent out.

As a result, by being arranged to being mutated by AC supply voltage caused by DC bus-bar voltage carry out overvoltage protection in advance Voltage protection range, the overvoltage protection in advance of DC bus-bar voltage caused by can making to being mutated by AC supply voltage is more Rationally, also relatively reliable.

At step S120, DC bus-bar voltage will be more than described first caused by being mutated by the AC supply voltage In the case of the upper limit for setting voltage range, the protection act of setting is executed.

Such as：Busbar voltage over-voltage detection circuit, can in advance to cause because of supply voltage sudden change overvoltage situation into Row is effectively protected.

To be more than as a result, the first setting voltage by the DC bus-bar voltage caused by being mutated by AC supply voltage Overvoltage protection is carried out when the upper limit of range in advance, it can be effective to causing the situation of overvoltage to carry out because of supply voltage sudden change in advance Ground is protected, and the promptness and reliability of protection are promoted.

In an optional embodiment, can also include：DC bus-bar voltage caused by being mutated by AC supply voltage The process of protection act is executed when the lower limit for falling below the first setting voltage range.

The overvoltage protection of the Electrical Towage Control Systems of the utility model of the utility model is shown with reference to Figure 11 DC bus-bar voltage caused by being mutated by AC supply voltage in method is fallen below under the first setting voltage range The flow diagram for executing an embodiment of protection act in limited time, further illustrates direct current caused by being mutated by AC supply voltage Busbar voltage executes the detailed process of protection act when falling below the lower limit of the first setting voltage range.

Step S210, after executing the protection act, direct current caused by detection is mutated by the AC supply voltage is female Whether line voltage falls below the lower limit of the first setting voltage range.

Step S220, DC bus-bar voltage falls below described first caused by being mutated by the AC supply voltage In the case of the lower limit for setting voltage range, cancel the protection act.

Such as：Busbar voltage over-voltage detection circuit, can in advance to cause because of supply voltage sudden change overvoltage situation into Row is effectively protected；And upon actuation, when supply voltage reduces to a certain degree, rectification circuit can restore normal work automatically Make, is unlikely to entire Electrical Towage Control Systems and shuts down, it is effective rapidly to the protection of whole system, enhance entire Electric Traction The security reliability of control system.

As a result, by advance to cause because of supply voltage sudden change overvoltage situation effectively protect after, DC bus-bar voltage caused by being mutated by the AC supply voltage falls below the lower limit of the first setting voltage range When cancel overvoltage protection, on the one hand ensure that cause because of supply voltage sudden change overvoltage situation carry out overvoltage protection it is timely Property and reliability, on the other hand also ensure makes power supply mould after the situation for leading to overvoltage because of supply voltage sudden change restores normal Block, Electrical Towage Control Systems wait for protected object that can resume operation in time and reliably.

In an optional embodiment, can also include：Bus capacitor voltage is more than second caused by being unloaded by load The process of protection act is executed when setting the upper limit of voltage range.

It is shown with reference to Figure 12 in the over-voltage protection method of the Electrical Towage Control Systems of the utility model by loading Bus capacitor voltage caused by unloading executes the stream of an embodiment of protection act when being more than the upper limit of the second setting voltage range Journey schematic diagram is further illustrated and is held when bus capacitor voltage caused by being unloaded by load is more than the upper limit of the second setting voltage range The detailed process of row protection act.

Whether step S310, bus capacitor voltage caused by load unloading of the detection by the power module set more than second The upper limit of constant voltage range.

Wherein, the first setting voltage range and the second setting voltage range, can be identical, can not also be identical.

As a result, by the way that different overvoltage protection voltage ranges is arranged in different overvoltage protection control, can be adapted for The overvoltage protection of a variety of occasions controls, and flexibility is good, versatile.

Step S320 has been more than described second to set in the bus capacitor voltage caused by the load of power module unloading In the case of the upper limit of constant voltage range, the protection act of setting is executed.

It has been more than as a result, the upper of the second setting voltage range by the bus capacitor voltage caused by being unloaded by load Protection act is executed in limited time, and the overvoltage protection for treating protected object bus capacitor voltage caused by loading unloading may be implemented, Protected mode is easy, protection result reliability is high.

Optionally, step S120, the execution such as step S320 setting protection act, may include：Turn off the power supply mould In block rectification circuit drive signal (such as：The scr rectification circuit in the power module is set to be stopped).

Wherein, the rectification circuit can be used for carrying out rectification to the AC supply voltage, obtain the DC bus Voltage.

As a result, overvoltage protection is realized by turning off the drive signal of rectification circuit so that the mode of overvoltage protection is easy, and It can ensure the safety of rectification circuit.

In an optional embodiment, can also include：Bus capacitor voltage drop is as low as low caused by being unloaded by load Cancel the process of protection act when the lower limit of the second setting voltage range.

It is shown with reference to Figure 13 in the over-voltage protection method of the Electrical Towage Control Systems of the utility model by loading Bus capacitor voltage caused by unloading cancels an implementation of protection act when falling below the lower limit of the second setting voltage range The flow diagram of example further illustrates that bus capacitor voltage caused by being unloaded by load falls below the second setting voltage model Cancel the detailed process of protection act when the lower limit enclosed.

Step S410, whether bus capacitor voltage falls below caused by load unloading of the detection by the power module The lower limit of second setting voltage range.

Step S420 falls below described the in the bus capacitor voltage caused by the load of power module unloading In the case of the lower limit of two setting voltage ranges, cancel the protection act action.

Such as：To overcome the shortcomings of existing Electrical Towage Control Systems median generatrix electric voltage over press guard method, increase by one Layer protection, can be effective other than conventional overvoltage crowbar by the overvoltage crowbar of scr rectification circuit It predicts busbar voltage overvoltage caused by supply voltage sudden change, and then takes safeguard measure in advance.

Such as：The busbar voltage overvoltage crowbar not only can effectively prevent bus overvoltage caused by load Condition of Sudden Unloading, It can also effectively prevent to cause because of supply voltage sudden change busbar voltage over-pressed, be not to make motor stopping, further enhance pair The protection of semiconductor power component, the relatively reliable safety of system operation.

As a result, by detecting that unloading caused bus capacitor voltage by load falls below the second setting voltage Cancel overvoltage protection when the lower limit of range, power module to be protected or Electrical Towage Control Systems can be made to restore normal work Make, not only high safety, it is ensured that the reliability of object work to be protected.

Optionally, when this method can be also used for cancelling the protection act, the step S220, cancellations such as step S420 The protection act may include：Open rectification circuit in the power supply the drive signal (such as：Make the power supply mould Scr rectification circuit in the block is resumed work).

As a result, cancelling protection act by way of opening the drive signal of rectification circuit, mode of operation is easy, and operates Result reliability is high.

The processing and function realized by the over-voltage protection method of the present embodiment essentially correspond to aforementioned Electric Traction control Embodiment, principle and the example of system processed, therefore not detailed place in the description of the present embodiment, may refer in previous embodiment Related description, this will not be repeated here.

Through a large amount of verification experimental verification, using the technical solution of the utility model, by by line voltage and DC bus-bar voltage It is compared, when supply voltage mutates, line voltage action can be faster than busbar voltage, and protection circuit compares traditional detection Protection circuit will be protected in advance, improve the reliability of whole system, reduce the damage to power device.

To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly It combined, be superimposed by ground.

The above description is only the embodiments of the present invention, is not intended to limit the utility model, for this field Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model, Any modification, equivalent replacement, improvement and so on should be included within the right of the utility model.

Claims (11)

1. a kind of over-pressure safety device, which is characterized in that including：Over-pressed detection unit (1) and protection driving unit (2)；Wherein,

The overvoltage detection unit (1), for caused by being mutated by the AC supply voltage of power module input side to be protected Before DC bus-bar voltage is less than the upper limit of the first setting voltage range, predict whether the DC bus-bar voltage will be more than described The upper limit of first setting voltage range；

The protection driving unit (2) is mutated for being predicted in the over-pressed detection unit (1) by the AC supply voltage For caused DC bus-bar voltage by the case of the upper limit for setting voltage range more than described first, the protection for executing setting is dynamic Make.

2. the apparatus according to claim 1, which is characterized in that wherein,

The overvoltage detection unit (1), being additionally operable to DC bus-bar voltage caused by detection is mutated by the AC supply voltage is The no lower limit for falling below the first setting voltage range；

The protection driving unit (2), being additionally operable to the DC bus-bar voltage caused by being mutated by the AC supply voltage reduces In the case of the lower limit less than the first setting voltage range, cancel the protection act；

And/or

The overvoltage detection unit (1) is additionally operable to bus capacitor voltage caused by detecting the load unloading by the power module Whether the upper limit of voltage range is set more than second；

The protection driving unit (2) has been additionally operable to the bus capacitor voltage caused by being unloaded by the load of the power module In the case of the upper limit more than the second setting voltage range, the protection act of setting is executed；

And/or

The overvoltage detection unit (1) is additionally operable to bus capacitor voltage caused by detecting the load unloading by the power module Whether the lower limit of second setting voltage range is fallen below；

The protection driving unit (2) is additionally operable in the bus capacitor voltage drop caused by the load of power module unloading In the case of as low as the lower limit less than the second setting voltage range, cancel the protection act action.

3. the apparatus according to claim 1, which is characterized in that wherein,

The protection act of setting is executed, including：

Turn off the drive signal of rectification circuit in the power module；The rectification circuit, for the AC supply voltage Rectification is carried out, the DC bus-bar voltage is obtained；

And/or

When the protection driving unit (2) is additionally operable to cancel the protection act,

Cancel the protection act, including：Open the drive signal of rectification circuit in the power module.

4. device according to claim 3, which is characterized in that wherein,

The rectification circuit, including：Scr rectification circuit；The drive signal of the scr rectification circuit, including：Thyristor Drive signal；

And/or

The first setting voltage range, including：380V~750V；And/or

When the over-pressed detection unit (1) is additionally operable to bus capacitor voltage caused by detecting the load unloading by the power module When whether setting the upper limit of voltage range more than second, the second setting voltage range, with the first setting voltage range It is identical.

5. according to the device described in one of claim 1-4, which is characterized in that the overvoltage detection unit (1), including：Busbar Overvoltage protection signal generation circuit (13)；

The bus overvoltage protection signal generation circuit (13), including：Input selection circuit (131), benchmark power supply circuit (132) With hysteresis loop comparator (133)；Wherein,

The input selection circuit (131), for the line voltage of the AC power and the magnitude relationship of DC bus-bar voltage It is compared, by the larger voltage in the line voltage and the DC bus-bar voltage, is selected as the hysteresis loop comparator (133) reverse inter-input-ing voltage of inverting input；

The benchmark power supply circuit (132) is the same phase of the hysteresis loop comparator (133) for the reference voltage according to setting Input terminal is provided with phase reference voltage；

The hysteresis loop comparator (133) sets the reverse inter-input-ing voltage and first for being based on the same phase reference voltage Voltage range or the second setting voltage range are compared, so that its output end exports corresponding high level or low level, as Overvoltage protection signal needed for the protection driving unit (2)；

And/or

The protection driving unit (2), including：Drive signal amplifying circuit (21)；

The drive signal amplifying circuit (21), including：With computing circuit (211) and driving circuit (212)；Wherein,

Described and computing circuit (211) is used for when the over-pressed detection unit (1) includes hysteresis loop comparator (133), will be described In power module the overvoltage protection signal of the drive signal of rectification circuit and the hysteresis loop comparator (133) output carry out with After operation, the control signal that the drive signal can be made effectively to be driven for controlling the driving circuit (212) is exported；

The driving circuit (212) is used under the control of the control signal exported with computing circuit (211), right The drive signal carries out driving in vain or effectively driving, is controlled to the execution of the protection act or the corresponding of cancellation with realization System.

6. device according to claim 5, which is characterized in that wherein,

It will be more than institute that the overvoltage detection unit (1), which predicts and is mutated caused DC bus-bar voltage by the AC supply voltage, The situation of the upper limit of the first setting voltage range is stated, including：

The line voltage is selected as the inverting input of the hysteresis loop comparator (133) by the input selection circuit (131) Reverse inter-input-ing voltage；

And/or

Bus capacitor voltage has been more than caused by the overvoltage detection unit (1) detects the load unloading by the power module The situation of the upper limit of the second setting voltage range, including：The input selection circuit (131) is by the DC bus-bar voltage It is selected as the reverse inter-input-ing voltage of the inverting input of the hysteresis loop comparator (133)；

And/or

The input selection circuit (131), including：First rectification module, the second rectification module and the first partial pressure and filter module； Wherein,

First rectification module, for carrying out rectification processing to the DC bus-bar voltage；

Second rectification module, for carrying out rectification processing to the line voltage；

First partial pressure and filter module, after in second rectification module to line voltage progress rectification processing, It is further divided and is filtered；

And/or

The benchmark power supply circuit (132), including：Second partial pressure and filter module；

Second partial pressure and filter module, are divided and are filtered for the reference voltage to setting；

And/or

The hysteresis loop comparator (133), including：First comparator and positive feedback module；

The positive feedback module is set between the output end and in-phase input end of the first comparator；

And/or

The hysteresis loop comparator (133) makes its output end output high level or low level, including：

It is less than the upper limit of the first setting voltage range or the second setting voltage range in the reverse inter-input-ing voltage The upper limit in the case of, make output end export high level；And/or

It is more than described first upper limit for setting voltage range or the second setting voltage range in the reverse inter-input-ing voltage In the case of the upper limit, make to jump to low level under the high level of the output end；And/or

It is reduced to the lower limit for being not below the first setting voltage range or the second setting electricity in the reverse inter-input-ing voltage In the case of the lower limit for pressing range, the output end is made to keep the low level；And/or

The lower limit of the first setting voltage range or the second setting voltage are fallen below in the reverse inter-input-ing voltage In the case of the lower limit of range, make high level described in rebound in the low level of the output end；

And/or

Can described exported with computing circuit (211) be such that the drive signal is had for controlling the driving circuit (212) The control signal of driving is imitated, including：

In the case where the overvoltage protection signal is high level, the control signal is high level, needs to cancel the protection Action；

It is low level in the overvoltage protection signal, the control signal is low level, needs to execute the protection Action；

And/or

The driving circuit (212), including：Driving chip and protection module；

The driving chip, in the case where the control signal is high level, carrying out power to the drive signal and putting Big processing, to realize effective driving to the drive signal；It is low level in the control signal, described in shutdown Drive signal, to realize the invalid driving to the drive signal；

The protection module, for the driving chip to the drive signal carry out power amplification processing after, further into Row pressure limiting and/or current limliting processing.

7. device according to claim 5, which is characterized in that it is described overvoltage detection unit (1), further include：Line voltage is sent out Raw circuit (12)；

Circuit (12) occurs for the line voltage, including：First input module (121), the second input module (122) and second compare Device (123)；Wherein,

First input module (121), for inputting the alternating current to the inverting input of second comparator (123) The first phase voltage in the voltage of source；

Second input module (122), for inputting the alternating current to the in-phase input end of second comparator (123) The second phase voltage in the voltage of source；

Second comparator (123), for carrying out calculus of differences processing to first phase voltage and second phase voltage Afterwards, first phase voltage and the corresponding line voltage of second phase voltage are exported.

8. device according to claim 7, which is characterized in that it is described overvoltage detection unit (1), further include：Voltage ratio Scale circuit (11)；

The voltage ratio scaling circuit (11), including：Division module (111) and voltage follower (112)；Wherein,

The division module (111) treats scaled voltage and carries out voltage division processing for the voltage scaling ratio in setting；Wherein, It is described to wait for scaled voltage, including：The phase voltage and/or the DC bus-bar voltage；

The voltage follower (112) is used in the division module (111) to the phase voltage and/or the DC bus After voltage carries out voltage division processing, further carries out voltage order one and follow processing, obtain the input selection circuit (131) input side DC bus-bar voltage, and/or the line voltage occur circuit (12) input side any phase voltage.

9. device according to claim 8, which is characterized in that wherein,

First input module (121), including：Third divides and filter module；

The third partial pressure and filter module, for first phase voltage to be divided and is filtered；

And/or

Second input module (122), including：4th partial pressure and filter module；

4th partial pressure and filter module, for second phase voltage to be divided and is filtered；

And/or

The division module (111), including：First divider resistance and the second divider resistance, the first divider resistance setting exist Described to wait between scaled voltage and the in-phase input end of the voltage follower (112), second divider resistance is arranged in institute Between the in-phase input end and ground of stating voltage follower (112)；Wherein,

The resistance value of first divider resistance sets Standard resistance range higher than the resistance value of second divider resistance；And/or

The voltage scaling ratio for waiting for scaled voltage, including：The resistance value of second divider resistance accounts for the first partial pressure electricity The ratio of resistance and the sum of the resistance value of second divider resistance；And/or

The voltage scaling ratio of the phase voltage is differed with the voltage scaling ratio of the DC bus-bar voltage；

And/or

At least one of second comparator (123) and the voltage follower (112), including：Dual power supply operation Amplifier.

10. a kind of power module, which is characterized in that including：Rectification circuit；

Further include：Over-pressure safety device as claimed in any one of claims 1-9 wherein；Wherein,

The over-pressure safety device is arranged between AC power and the rectification circuit, for by for the rectification circuit Effective or invalid drive signal is provided, realizes and the load-carrying overvoltage of the rectification circuit and/or power module institute is protected Shield.

11. a kind of Electrical Towage Control Systems, which is characterized in that including：Power module as claimed in claim 10.