CN113965096B - Series 12 pulse wave rectifier with auxiliary power factor correction circuit - Google Patents
Series 12 pulse wave rectifier with auxiliary power factor correction circuit Download PDFInfo
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- CN113965096B CN113965096B CN202111254849.8A CN202111254849A CN113965096B CN 113965096 B CN113965096 B CN 113965096B CN 202111254849 A CN202111254849 A CN 202111254849A CN 113965096 B CN113965096 B CN 113965096B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/10—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A series 12-pulse rectifier with auxiliary power factor correction circuit belongs to the technical field of power electronics. The invention solves the problem of poor harmonic suppression capability of the existing series 12-pulse rectifier. The invention outputs PWM driving signals to the switching tube S in the auxiliary power factor correction circuit by controlling the PWM signal driving circuit 1 The gate electrode of (2) is controlled to control the switching tube S 1 When the input voltage at the network side or the current flowing through the load changes, the sampled load current signal i d With a consequent change in the value of (1), given a current i sref And correspondingly changes, the action of a switching tube in the auxiliary power factor correction circuit is correspondingly changed, so that the input current of the auxiliary power factor correction circuit follows the given signal i of the injection current sref Corresponding changes, and effective inhibition of input current harmonic waves of the 12-pulse rectifier is further ensured. The invention is mainly used in the field of industrial rectification.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a series 12-pulse rectifier.
Background
The series 12-pulse rectifier has the advantages of simple structure, high reliability, low cost, low EMI and the like, and is widely applied to high-power occasions with medium and high voltage, for example: compared with the conventional three-phase rectifier, the high-power high-voltage direct-current power supply device can eliminate 5 th harmonic and 7 th harmonic in input current, but the output current still contains a large amount of 12n plus or minus 1 th harmonic, so that serious harmonic pollution can be brought to a circuit, and the requirements of industrial application and the harmonic standard of IEEE519 or IEC-6 can not be met.
In order to further suppress the harmonics generated by the series 12-pulse rectifier, various methods are currently proposed. In general, two methods are mainly involved: one is to use active, passive and hybrid filters to compensate for the harmonics generated by the rectifiers. The passive filter has the advantages of simple structure and low cost, but the passive filter has limited harmonic compensation capability and can only compensate certain low-order harmonic waves, and the harmonic compensation effect of the passive filter has a larger relation with the operating parameters of the circuit, so that when the operating state of the system changes, the harmonic suppression effect of the passive filter also changes greatly. The active filter has the advantage of good harmonic suppression effect, but the design of the active filter is relatively complex, which not only increases the cost, but also reduces the reliability of the system.
The other is to modify the existing 12-pulse rectifier. The most common method for high-power occasions is to further reduce the harmonic wave of the input current by increasing the pulse number of the rectifier, more common is to increase the pulse number of the rectifier by increasing the phase number of the output voltage of the phase-shifting transformer, and achieve the purpose of increasing the pulse number of the rectifier after phase-shifting multiple connection through a plurality of rectifier bridges, so that further suppression of the harmonic wave of the rectifier is achieved, however, as the pulse number of the rectifier increases, the winding number of the phase-shifting transformer is also increased in a multiplied manner, so that the manufacturing design difficulty of the phase-shifting transformer is increased, the symmetry among windings is difficult to ensure, non-characteristic subharmonic waves are caused in the input current, and the harmonic suppression effect of the rectifier is reduced. In order to solve the contradiction, a direct-current side passive pulse multiplication technology of a series-type 12-pulse rectifier is proposed, the output current modes of two rectifier bridges are modulated and increased by introducing a small passive link on the direct-current side, then the input step number of the rectifier is increased to 24 according to the current relation of the alternating-current side, and the THD of the input current is reduced to about 1 time.
Disclosure of Invention
The invention aims to solve the problem of poor harmonic suppression capability of the existing series 12-pulse rectifier, and provides a series 12-pulse rectifier with an auxiliary power factor correction circuit; the series 12-pulse rectifier has the following two structures:
the first structure:
the serial 12 pulse wave rectifier with auxiliary power factor correction circuit includes phase shifting transformer, first rectifier bridge, second rectifier bridge, auxiliary single phase transformer, auxiliary power factor correction circuit, balancing reactor, load current sampling circuit, subtracter, synchronous signal sampling circuit, 12 frequency multiplication triangular wave generating circuit, input current sampling circuit, injection current setting circuit, PWM signal driving circuit, hysteresis comparator, capacitor C 1 And capacitor C 2 ；
The phase-shifting transformer is used for shifting the phase of the three-phase voltage output by the power grid to generate two groups of three-phase voltages with the phase difference of 30 degrees, and the two groups of three-phase voltages with the phase difference of 30 degrees are respectively used as the input voltages of the first rectifier bridge and the second rectifier bridge;
positive polarity output end of first rectifier bridge and capacitor C 1 Is connected with the positive polarity end of the load at the same time; the negative polarity output end of the first rectifier bridge is simultaneously connected with the positive polarity end of the second rectifier bridge, the positive polarity end M of the output side of the auxiliary power factor correction circuit and one end of the primary winding of the auxiliary single-phase transformer; negative polarity end of the second rectifier bridge and negative polarity end N of output side of the auxiliary power factor correction circuit, and capacitor C 2 Is connected with the negative end of the load at the same time;
the other end of the primary winding of the auxiliary single-phase transformer is connected with the center tap output end D of the balancing reactor, and the two ends of the secondary winding of the auxiliary single-phase transformer are respectively connected with the positive polarity end A and the negative polarity end B of the input side of the auxiliary power factor correction circuit;
one end of the balancing reactor and the capacitor C 1 The other end of the balancing reactor is connected with the capacitor C 2 Is connected with the other end of the connecting rod;
the synchronous signal sampling circuit is used for synchronously collecting u a1 And u b1 And will synchronously acquire u a1 And u b1 After the current is sent to a 12-frequency multiplication triangular wave generating circuit, a triangular wave signal is generated and sent to an injection current setting circuit; the triangular wave signal generated by the 12-frequency multiplication triangular wave generating circuit and the triangular wave signal output by the secondary winding of the auxiliary single-phase transformer are synchronous in the same frequency and in the same phase;
u a1 a phase voltage which is an a-phase voltage among three-phase voltages input from the phase-shifting transformer into the second rectifier bridge;
u b1 b-phase voltage among three-phase voltages input from the phase-shifting transformer into the second rectifier bridge;
the load current sampling circuit is used for collecting a load current signal i flowing through a load d And the collected load current signal i d To the injection current setting circuit;
Injection current setting circuit for generating triangular wave signal and load current signal i d After multiplication, the resulting given signal i sref The positive input end of the subtracter is sent to;
the input current sampling circuit is used for collecting the current flowing through the inductor L and inputting the current to the auxiliary power factor correction circuit s Is the current signal i of (2) sf And the acquired current signal i sf To the negative input of the subtractor;
the subtracter gives the signal i sref And current signal i sf Performing difference making, and sending a difference result to a hysteresis comparator; wherein a signal i is given sref As a subtracted number, the current signal i sf As a reduction;
the hysteresis comparator is used for generating a control signal to drive and control the PWM signal driving circuit according to the received difference result and the preset loop width, so that the PWM signal driving circuit generates a corresponding PWM driving signal to the switching tube S in the auxiliary power factor correction circuit according to the received control signal 1 Is driven and controlled;
the preset loop width is equal to the difference value between the preset hysteresis boundary upper limit and the preset hysteresis boundary lower limit.
The second structure:
the serial 12 pulse wave rectifier with auxiliary power factor correction circuit includes phase shifting transformer, first rectifier bridge, second rectifier bridge, first auxiliary single phase transformer, auxiliary power factor correction circuit, second auxiliary single phase transformer, load current sampling circuit, subtracter, synchronous signal sampling circuit, 12 frequency multiplication triangular wave generating circuit, input current sampling circuit, injection current setting circuit, PWM signal driving circuit, hysteresis comparator and capacitor C 1 And capacitor C 2 ；
The phase-shifting transformer is used for shifting the phase of the three-phase voltage output by the power grid to generate two groups of three-phase voltages with the phase difference of 30 degrees, and the two groups of three-phase voltages with the phase difference of 30 degrees are respectively used as the input voltages of the first rectifier bridge and the second rectifier bridge;
positive polarity output end of first rectifier bridge and capacitor C 1 The positive polarity end P of the output side of the auxiliary power factor correction circuit and the positive polarity end of the load are connected at the same time, and the negative polarity end of the first rectifier bridge and the positive polarity end of the second rectifier bridge are connected at the endpoint O; negative polarity end of second rectifier bridge and capacitor C 2 The negative terminal N of the auxiliary power factor correction circuit and the negative terminal of the load are connected at the same time;
one end B of primary winding of first auxiliary single-phase transformer and capacitor C 1 One end D of the primary winding of the second auxiliary single-phase transformer is connected with a capacitor C 2 Is connected with the other end of the connecting rod,
the other end of the primary winding of the first auxiliary single-phase transformer is connected with the other end of the primary winding of the second auxiliary single-phase transformer at an end point A, and an end point O is connected with the end point A;
one end E of a secondary winding of the first auxiliary single-phase transformer and one end F of a secondary winding of the second auxiliary single-phase transformer are respectively connected with an input side positive polarity end E of the auxiliary power factor correction circuit and an input side negative polarity end F of the auxiliary power factor correction circuit;
The other end of the secondary winding of the first auxiliary single-phase transformer is connected with the other end of the secondary winding of the second auxiliary single-phase transformer;
the synchronous signal sampling circuit is used for synchronously collecting u a1 And u b1 And will synchronously acquire u a1 And u b1 After the current is sent to a 12-frequency multiplication triangular wave generating circuit, a triangular wave signal is generated and sent to an injection current setting circuit; the triangular wave signal generated by the 12-frequency multiplication triangular wave generating circuit and the triangular wave signal received by the input side of the auxiliary power factor correction circuit are synchronous in the same frequency and the same phase;
u a1 a phase voltage which is an a-phase voltage among three-phase voltages input from the phase-shifting transformer into the second rectifier bridge;
u b1 b-phase voltage among three-phase voltages input from the phase-shifting transformer into the second rectifier bridge;
the load current sampling circuit is used for collecting a load current signal i flowing through a load d And the collected load current signal i d To the injection current setting circuit;
injection current setting circuit for generating triangular wave signal and load current signal i d After multiplication, the resulting given signal i sref The positive input end of the subtracter is sent to;
the input current sampling circuit is used for collecting the current flowing through the inductor L and inputting the current to the auxiliary power factor correction circuit s Is the current signal i of (2) sf And the acquired current signal i sf To the negative input of the subtractor;
the subtracter gives the signal i sref And current signal i sf Performing difference making, and sending a difference result to a hysteresis comparator; wherein a signal i is given sref As a subtracted number, the current signal i sf As a reduction;
the hysteresis comparator is used for generating a control signal to drive and control the PWM signal driving circuit according to the received difference result and the preset loop width, so that the PWM signal driving circuit generates a corresponding PWM driving signal to the switching tube S in the auxiliary power factor correction circuit according to the received control signal 1 Is driven and controlled;
the preset loop width is equal to the difference value between the preset hysteresis boundary upper limit and the preset hysteresis boundary lower limit.
Principle analysis:
according to the invention, an auxiliary power factor correction circuit is introduced into the direct current side of the series 12-pulse rectifier, so that the switching tube S1 in the auxiliary power factor correction circuit is controlled to be switched on and off according to the magnitude of load current, so that the current flowing through a primary winding (aiming at a first structure shown in fig. 1) of an auxiliary single-phase transformer or a wire (aiming at a second structure shown in fig. 8) between an A end and an O end of the direct current side is a triangular wave current with the amplitude being 2 times of the amplitude of the load current and the frequency being 6 times of the frequency of the input voltage at the network side, and then the input current of the 12-pulse rectifier is corrected to be an approximate sine wave with the THD being less than 5% according to the circuit relation of the alternating current and the direct current side of the 12-pulse rectifier. When the input voltage at the network side or the current flowing through the load changes, the sampled load current signal i d With a consequent change in the value of (1), given a current i sref And correspondingly changes, the action of a switching tube in the auxiliary power factor correction circuit is correspondingly changed, so that the input current of the auxiliary power factor correction circuit follows the given signal i of the injection current sref Corresponding changes, and effective inhibition of input current harmonic waves of the 12-pulse rectifier is further ensured.
The beneficial effects brought by the invention are as follows:
1. the input current THD of the rectifier can be reduced by one order of magnitude by introducing an auxiliary power factor correction circuit with small capacity (less than 3% of output power) on the direct current side without increasing the number of windings of the phase-shifting transformer and the number of rectifier bridges, and the requirements of industrial application requirements, IEEE519 and other harmonic standards are met.
2. The auxiliary power factor correction circuit at the direct current side works in a unit power factor state, harmonic energy extracted from the rectifier is fed back to the load, the energy conversion efficiency of the rectifier is improved, and energy waste is avoided.
3. The auxiliary power factor correction circuit can adopt a Vienna circuit structure or a Boost circuit structure, and can reduce the input current THD of the series 12-pulse rectifier to be within 5% only by using one controllable switching device, and has the advantages of simple circuit structure, easiness in control and low cost.
Drawings
Fig. 1 is a schematic diagram of a series 12-pulse rectifier with an auxiliary pfc circuit according to an embodiment; this structure is the first structure of the present invention;
fig. 2 is a schematic diagram of a specific structure of the auxiliary pfc circuit 5 according to the second embodiment;
FIG. 3 is a graph illustrating the operation of the series 12-pulse rectifier with auxiliary PFC circuit according to one or more embodiments; wherein the abscissa represents time and the ordinate represents current;
FIG. 4 is at t 0 To t 1 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
FIG. 5 is at t 1 To t 2 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
FIG. 6 is at t 3 To t 4 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
FIG. 7 is at t 4 To t 5 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
Fig. 8 is a schematic diagram of a series 12-pulse rectifier with an auxiliary pfc circuit according to a fourth embodiment; the structure is a second structure of the invention;
fig. 9 is a schematic structural diagram of the auxiliary pfc circuit 5 according to the fourth embodiment;
FIG. 10 is at t 0 To t 1 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
FIG. 11 is a schematic illustration of the processt 1 To t 2 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
FIG. 12 is at t 3 To t 4 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
FIG. 13 is at t 4 To t 5 In the period, the auxiliary power factor correction circuit 5 is a schematic diagram of the working state of the auxiliary Boost type power factor correction circuit;
wherein in FIGS. 9 to 13, u d Representing the voltage across the load 6.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The first embodiment is as follows: the serial 12-pulse rectifier with auxiliary power factor correction circuit according to the present embodiment is described below with reference to fig. 1, and includes a phase-shifting transformer 1, a first rectifier bridge 2, a second rectifier bridge 3, an auxiliary single-phase transformer 4, an auxiliary power factor correction circuit 5, a balancing reactor 7, a load current sampling circuit 8, a subtractor 9, a synchronous signal sampling circuit 10, a 12-frequency multiplication triangular wave generating circuit 11, an input current sampling circuit 12, an injection current setting circuit 13, a PWM signal driving circuit 14, a hysteresis comparator 15, and a capacitor C 1 And capacitor C 2 ；
The phase-shifting transformer 1 is used for shifting the phase of three-phase voltage output by a power grid to generate two groups of three-phase voltages with the phase difference of 30 degrees, wherein the two groups of three-phase voltages with the phase difference of 30 degrees are respectively used as input voltages of the first rectifier bridge 2 and the second rectifier bridge 3;
positive polarity output terminal of the first rectifier bridge 2 and capacitor C 1 Is connected to the positive polarity terminal of the load 6 simultaneously; the negative polarity output end of the first rectifier bridge 2 is simultaneously connected with the positive polarity end of the second rectifier bridge 3, the positive polarity end M of the output side of the auxiliary power factor correction circuit 5 and one end of the primary winding of the auxiliary single-phase transformer 4; the negative polarity end of the second rectifier bridge 3 and the negative polarity end N of the output side of the auxiliary power factor correction circuit 5, and a capacitor C 2 Is connected to the negative polarity end of the load 6 at the same time;
the other end of the primary winding of the auxiliary single-phase transformer 4 is connected with the center tap output end D of the balancing reactor 7, and the two ends of the secondary winding of the auxiliary single-phase transformer 4 are respectively connected with the positive polarity end A and the negative polarity end B of the input side of the auxiliary power factor correction circuit 5;
one end of the balancing reactor 7 is connected with a capacitor C 1 The other end of the balancing reactor 7 is connected with the capacitor C 2 Is connected with the other end of the connecting rod;
the synchronous signal sampling circuit 10 is used for synchronously collecting u a1 And u b1 And will synchronously acquire u a1 And u b1 After being sent to the 12-frequency multiplication triangular wave generating circuit 11, the triangular wave signal is generated and sent to the injection current setting circuit 13; the triangular wave signal generated by the 12-frequency multiplication triangular wave generation circuit 11 and the triangular wave signal output by the secondary winding of the auxiliary single-phase transformer 4 are synchronous in the same frequency and the same phase;
u a1 an a-phase voltage which is one of the three-phase voltages inputted from the phase-shifting transformer 1 into the second rectifier bridge 3;
u b1 b-phase voltage which is the three-phase voltage input from the phase-shifting transformer 1 into the second rectifier bridge 3;
the load current sampling circuit 8 is used for collecting a load current signal i flowing through the load 6 d And the collected load current signal i d To the injection current setting circuit 13;
the injection current setting circuit 13 is used for generating a triangular wave signal and a load current signal i for receiving d After multiplication, generateGiven signal i sref To the positive input of subtractor 9;
an input current sampling circuit 12 is used for collecting the input current flowing through the inductor L to the auxiliary power factor correction circuit 5 s Is the current signal i of (2) sf And the acquired current signal i sf To the negative input of subtractor 9;
subtractor 9 gives a given signal i sref And current signal i sf Performing difference making, and sending a difference result to a hysteresis comparator 15; wherein a signal i is given sref As a subtracted number, the current signal i sf As a reduction;
the hysteresis comparator 15 is configured to generate a control signal to drive and control the PWM signal driving circuit 14 according to the received difference result and a preset loop width, so that the PWM signal driving circuit 14 generates a corresponding PWM driving signal to the switching tube S in the auxiliary power factor correction circuit 5 according to the received control signal 1 Is driven and controlled;
the preset loop width is equal to the difference value between the preset hysteresis boundary upper limit and the preset hysteresis boundary lower limit.
In the present embodiment, the PWM signal driving circuit 14 outputs a PWM driving signal to the switching transistor S in the auxiliary power factor correction circuit 5 1 The gate electrode of (2) is controlled to control the switching tube S 1 When the network side input voltage or the current flowing through the load 6 changes, the sampled load current signal i d With a consequent change in the value of (1), given a current i sref Also correspondingly, the action of the switching tube in the auxiliary power factor correction circuit 5 is correspondingly changed, so that the input current of the auxiliary power factor correction circuit 5 follows the given signal i of the injection current sref Corresponding changes, and effective inhibition of input current harmonic waves of the 12-pulse rectifier is further ensured.
In specific applications, the hysteresis comparator 14 may be controlled by a controller such as a PI controller or a control method such as predictive control.
The phase-shifting transformer 1 may be any type of isolation transformer that outputs two groups of phase-shifting transformers with a phase difference of 30 °, including but not limited to: star-delta-star type isolation transformers, polygonal type isolation transformers, zig-zag type isolation transformers, and the like.
The second embodiment is as follows: the following description of the present embodiment with reference to fig. 2 is different from the serial 12-pulse rectifier with auxiliary pfc circuit according to the embodiment in that the auxiliary pfc circuit 5 is an auxiliary Boost type pfc circuit, and the auxiliary Boost type pfc circuit includes a diode D 1 To D 5 Inductance L s And a switch tube S 1 ；
Diode D 1 Anode and diode D of (c) 3 After the cathode connection of (2), as the input side positive polarity terminal a of the auxiliary power factor correction circuit 5;
diode D 2 Anode and diode D of (c) 4 After the cathode of the auxiliary power factor correction circuit 5 is connected, the auxiliary power factor correction circuit is used as an input side negative polarity end B;
diode D 1 Cathode, diode D of (2) 2 Cathode and inductance L of (2) s Is connected at the same time;
diode D 3 Anode, diode D of (c) 4 Anode and switching tube S of (2) 1 After the anode of the auxiliary power factor correction circuit 5 is connected, the auxiliary power factor correction circuit is used as an output side negative polarity end N;
inductance L s And diode D 5 Anode and switching tube S of (2) 1 The cathodes of the electrodes are connected at the same time;
switch tube D 5 As the positive polarity terminal M on the output side of the auxiliary pfc circuit 5.
In the present embodiment, the inductance L is used s Is a direct current triangle wave current with 12 times of input voltage frequency.
The frequency of the output voltage of the auxiliary single-phase transformer 4 is 6 times of the frequency of the three-phase voltage output by the power grid, and the output voltage of the auxiliary single-phase transformer 4 is approximately symmetrical triangular wave.
The auxiliary pfc circuit 5 may also use other controllable rectifying circuits that can generate a suitable triangular current and can work at a unit power factor, including but not limited to: a single-phase PWM rectification circuit and a vienna rectification circuit.
And a third specific embodiment: next, referring to fig. 3 to 7, the difference between the present embodiment and the series 12-pulse rectifier with auxiliary power factor correction circuit according to the second embodiment is that the auxiliary power factor correction circuit 5 includes 4 operation modes, specifically:
working mode I: described in conjunction with fig. 3 and 4, at t 0 Time of day, diode D 1 Switch tube S 1 And diode D 4 Conduction, diode D 2 Diode D 3 And diode D 5 The current i flowing through the positive polarity terminal a on the input side of the auxiliary pfc circuit 5 is turned off s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube S 1 And diode D 4 At this time, the voltage u between the positive polarity terminal a on the input side and the negative polarity terminal B on the input side inputted to the auxiliary power factor correction circuit 5 s Added to the inductance L s On flowing through the inductance L s Current i on sf Linearly rise, inductance L s Storing energy;
at t 1 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the preset upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 1 ＞t 0 ；
Working mode II: described in conjunction with fig. 3 and 5, at t 1 Time of day, diode D 2 Diode D 3 And a switch tube S 1 Turn-off, diode D 1 Diode D 4 And diode D 5 On the other hand, at this time, a current i flowing through the positive polarity terminal a on the input side of the auxiliary pfc circuit 5 s The propagation direction of (a) is still positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube D 5 Load 6 and diode D 4 Freewheel and current i flowing through inductance Ls sf Linear decrease;
as in fig. 3, at t 1 To t 2 During the period of time, inductance L s And a voltage u between the positive polarity terminal A of the input side and the negative polarity terminal B of the auxiliary PFC circuit 5 s Together charge the load 6;
at t 2 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 2 ＞t 1 ；
Working mode III: as described in connection with fig. 3 and 6, at t 3 To t 4 Diode D during a period of time 2 Switch tube S 1 And diode D 3 Conduction, diode D 1 Diode D 4 And diode D 5 The current i flowing through the negative polarity terminal B on the input side of the auxiliary pfc circuit 5 is turned off s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube S 1 And diode D 3 At this time, the voltage u between the positive polarity terminal a on the input side and the negative polarity terminal B on the input side inputted to the auxiliary power factor correction circuit 5 s Added to the inductance L s On flowing through the inductance L s Is the current i of (2) sf Linearly rise, inductance L s Storing energy;
at t 4 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 ；
Working mode IV: described in conjunction with fig. 3 and 7, at t 4 Time of day, diode D 1 Diode D 4 And a switch tube S 1 Turn-off, diode D 2 Diode D 3 And a switch tube D 5 Conduction and current i flowing through negative polarity terminal B of input side of auxiliary PFC circuit 5 s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube D 5 Load 6 and diodeD 3 Freewheeling; wherein flows through the inductance L s Is the current i of (2) sf Linear decrease;
as in fig. 3, at t 4 To t 5 During the period of time, inductance L s And a voltage u input between the positive polarity terminal A and the negative polarity terminal B of the auxiliary PFC circuit 5 s Together charge the load 6;
at t 5 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 5 ＞t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 。
The specific embodiment IV is as follows: the serial 12-pulse rectifier with auxiliary power factor correction circuit according to the present embodiment is described below with reference to fig. 8, and includes a phase-shifting transformer 1, a first rectifier bridge 2, a second rectifier bridge 3, a first auxiliary single-phase transformer 4, an auxiliary power factor correction circuit 5, a second auxiliary single-phase transformer 7, a load current sampling circuit 8, a subtractor 9, synchronous signal sampling circuits 10, 12-frequency-multiplied triangular wave generation circuit 11, an input current sampling circuit 12, an injection current setting circuit 13, a PWM signal driving circuit 14, a hysteresis comparator 15, and a capacitor C 1 And capacitor C 2 ；
The phase-shifting transformer 1 is used for shifting the phase of three-phase voltage output by a power grid to generate two groups of three-phase voltages with the phase difference of 30 degrees, wherein the two groups of three-phase voltages with the phase difference of 30 degrees are respectively used as input voltages of the first rectifier bridge 2 and the second rectifier bridge 3;
positive polarity output terminal of the first rectifier bridge 2 and capacitor C 1 The positive polarity end P of the output side of the auxiliary power factor correction circuit 5 and the positive polarity end of the load 6 are connected at the same time, and the negative polarity end of the first rectifier bridge 2 and the positive polarity end of the second rectifier bridge 3 are connected at the endpoint O; negative polarity end of the second rectifier bridge 3 and capacitor C 2 The negative terminal N of the auxiliary power factor correction circuit 5 and the negative terminal of the load 6 are connected at the same time;
one end B of primary winding of first auxiliary single-phase transformer 4 and capacitor C 1 One end D of the primary winding of the second auxiliary single-phase transformer 7 is connected with a capacitor C 2 Is connected with the other end of the connecting rod,
the other end of the primary winding of the first auxiliary single-phase transformer 4 is connected with the other end of the primary winding of the second auxiliary single-phase transformer 7 at an end point A, and an end point O is connected with the end point A;
one end E of the secondary winding of the first auxiliary single-phase transformer 4 and one end F of the secondary winding of the second auxiliary single-phase transformer 7 are respectively connected with the input side positive polarity end E of the auxiliary power factor correction circuit 5 and the input side negative polarity end F of the auxiliary power factor correction circuit 5;
The other end of the secondary winding of the first auxiliary single-phase transformer 4 is connected with the other end of the secondary winding of the second auxiliary single-phase transformer 7;
the synchronous signal sampling circuit 10 is used for synchronously collecting u a1 And u b1 And will synchronously acquire u a1 And u b1 After being sent to the 12-frequency multiplication triangular wave generating circuit 11, the triangular wave signal is generated and sent to the injection current setting circuit 13; wherein, the triangular wave signal generated by the 12-frequency multiplication triangular wave generating circuit 11 and the triangular wave signal received by the input side of the auxiliary power factor correction circuit 5 are synchronous and have the same frequency and the same phase;
u a1 an a-phase voltage which is one of the three-phase voltages inputted from the phase-shifting transformer 1 into the second rectifier bridge 3;
u b1 b-phase voltage which is the three-phase voltage input from the phase-shifting transformer 1 into the second rectifier bridge 3;
the load current sampling circuit 8 is used for collecting a load current signal i flowing through the load 6 d And the collected load current signal i d To the injection current setting circuit 13;
the injection current setting circuit 13 is used for generating a triangular wave signal and a load current signal i for receiving d After multiplication, the resulting given signal i sref To the positive input of subtractor 9;
an input current sampling circuit 12 is used for collecting the input current flowing through the inductor L to the auxiliary power factor correction circuit 5 s Is the current signal i of (2) sf And the collected current signali sf To the negative input of subtractor 9;
subtractor 9 gives a given signal i sref And current signal i sf Performing difference making, and sending a difference result to a hysteresis comparator 15; wherein a signal i is given sref As a subtracted number, the current signal i sf As a reduction;
the hysteresis comparator 15 is configured to generate a control signal to drive and control the PWM signal driving circuit 14 according to the received difference result and a preset loop width, so that the PWM signal driving circuit 14 generates a corresponding PWM driving signal to the switching tube S in the auxiliary power factor correction circuit 5 according to the received control signal 1 Is driven and controlled;
the preset loop width is equal to the difference value between the preset hysteresis boundary upper limit and the preset hysteresis boundary lower limit.
In this embodiment, the auxiliary power factor correction circuit 5 on the dc side of the series 12-pulse rectifier controls the on and off of the switching tube S1 in the auxiliary power factor correction circuit 5 according to the magnitude of the current of the load 6, so that the current flowing through the primary winding of the auxiliary single-phase transformer 4 is a triangular wave current of a specific positive-negative symmetry whose amplitude is 2 times the amplitude of the current of the load 6 and whose frequency is 6 times the frequency of the input voltage on the net side, and then corrects the input current of the 12-pulse rectifier to an approximate sine wave with THD less than 2% according to the ac-dc side circuit relationship of the 12-pulse rectifier. When the network side input voltage or the current flowing through the load 6 changes, the sampled load current signal i d With a consequent change in the value of (1), given a current i sref Also correspondingly, the action of the switching tube in the auxiliary power factor correction circuit 5 is correspondingly changed, so that the input current of the auxiliary power factor correction circuit 5 follows the given signal i of the injection current sref Corresponding changes, and effective inhibition of input current harmonic waves of the 12-pulse rectifier is further ensured. In specific applications, the hysteresis comparator 14 may be controlled by a controller such as a PI controller or a control method such as predictive control.
The phase-shifting transformer 1 may be any type of isolation transformer that outputs two groups of phase-shifting transformers with a phase difference of 30 °, including but not limited to: star-delta-star type isolation transformers, polygonal type isolation transformers, zig-zag type isolation transformers, and the like.
Fifth embodiment: the following description of the present embodiment with reference to fig. 9 is different from the serial 12-pulse rectifier with auxiliary pfc circuit of the fourth embodiment in that the auxiliary pfc circuit 5 is an auxiliary Boost type pfc circuit, and the auxiliary Boost type pfc circuit includes a diode D 1 To D 5 Inductance L s And a switch tube S 1 ；
Diode D 1 Anode and diode D of (c) 3 After the cathode connection, as the input side positive polarity terminal E of the auxiliary power factor correction circuit 5;
diode D 2 Anode and diode D of (c) 4 After the cathode of the auxiliary power factor correction circuit 5 is connected, the auxiliary power factor correction circuit is used as an input side negative polarity end F;
diode D 1 Cathode, diode D of (2) 2 Cathode and inductance L of (2) s Is connected at the same time;
diode D 3 Anode, diode D of (c) 4 Anode and switching tube S of (2) 1 After the anode of the auxiliary power factor correction circuit 5 is connected, the auxiliary power factor correction circuit is used as an output side negative polarity end N;
inductance L s And diode D 5 Anode and switching tube S of (2) 1 The cathodes of the electrodes are connected at the same time;
switch tube D 5 As the positive polarity terminal M on the output side of the auxiliary pfc circuit 5.
In the present embodiment, the inductance L is used s Is a direct current triangle wave current with 12 times of input voltage frequency.
The frequency of the output voltage of the auxiliary single-phase transformer 4 is 6 times of the frequency of the three-phase voltage output by the power grid, and the output voltage of the auxiliary single-phase transformer 4 is approximately symmetrical triangular wave.
The auxiliary pfc circuit 5 may also use other controllable rectifying circuits that can generate a suitable triangular current and can work at a unit power factor, including but not limited to: a single-phase PWM rectification circuit and a vienna rectification circuit.
Specific embodiment six: next, referring to fig. 3 and fig. 9 to fig. 13, the difference between the present embodiment and the series 12-pulse rectifier with auxiliary power factor correction circuit according to the fourth embodiment is that the auxiliary power factor correction circuit 5 includes 4 operation modes, specifically, the following:
working mode I: as described in connection with fig. 3 and 10, at t 0 Time of day, diode D 1 Switch tube S 1 And diode D 4 Conduction, diode D 2 Diode D 3 And diode D 5 The current i flowing through the positive polarity terminal E on the input side of the auxiliary pfc circuit 5 is turned off s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube S 1 And diode D 4 At this time, the voltage u between the positive polarity terminal E on the input side and the negative polarity terminal F on the input side inputted to the auxiliary PFC circuit 5 s Added to the inductance L s On flowing through the inductance L s Current i on sf Linearly rise, inductance L s Storing energy;
at t 1 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the preset upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 1 ＞t 0 ；
Working mode II: described in conjunction with fig. 3 and 11, at t 1 Time of day, diode D 2 Diode D 3 And a switch tube S 1 Turn-off, diode D 1 Diode D 4 And diode D 5 On the other hand, at this time, a current i flowing through the positive polarity terminal E on the input side of the auxiliary pfc circuit 5 s The propagation direction of (a) is still positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube D 5 Load 6 and diode D 4 Freewheel and current i flowing through inductance Ls sf Linear decrease;
as in fig. 3, at t 1 To t 2 During the period of time, inductance L s And a voltage u between the positive polarity terminal E of the input side and the negative polarity terminal F of the auxiliary PFC circuit 5 s Together charge the load 6;
at t 2 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 2 ＞t 1 ；
Working mode III: as described in connection with fig. 3 and 12, at t 3 To t 4 Diode D during a period of time 2 Switch tube S 1 And diode D 3 Conduction, diode D 1 Diode D 4 And diode D 5 The current i flowing through the negative polarity terminal F on the input side of the auxiliary pfc circuit 5 is turned off s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube S 1 And diode D 3 At this time, the voltage u between the positive polarity terminal E on the input side and the negative polarity terminal F on the input side inputted to the auxiliary PFC circuit 5 s Added to the inductance L s On flowing through the inductance L s Is the current i of (2) sf Linearly rise, inductance L s Storing energy;
at t 4 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 ；
Working mode IV: described in conjunction with fig. 3 and 13, at t 4 Time of day, diode D 1 Diode D 4 And a switch tube S 1 Turn-off, diode D 2 Diode D 3 And a switch tube D 5 Conduction and current i flowing through negative polarity terminal F of input side of auxiliary PFC circuit 5 s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube D 5 Load 6 and diode D 3 Freewheeling; and flows through the inductance L s Is the current i of (2) sf Linear decrease;
as in fig. 3, at t 4 To t 5 During the period of time, inductance L s And a voltage u input between the positive polarity terminal E and the negative polarity terminal F of the auxiliary PFC circuit 5 s Together charge the load 6;
at t 5 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 5 ＞t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 。
Seventh embodiment: the following describes the present embodiment with reference to fig. 3, which differs from the series 12-pulse rectifier with auxiliary power factor correction circuit described in the third or sixth embodiment in that, among the 4 operation modes of the auxiliary power factor correction circuit 5,
Current i sf During the forward flow, the working mode I and the working mode II are alternately performed;
current i sf During the reverse flow, operation mode III and operation mode IV alternate.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (7)
1. The series 12 pulse wave rectifier with auxiliary power factor correction circuit is characterized by comprising a phase-shifting transformer (1) and a first pulse wave rectifierA rectifier bridge (2), a second rectifier bridge (3), an auxiliary single-phase transformer (4), an auxiliary power factor correction circuit (5), a balancing reactor (7), a load current sampling circuit (8), a subtracter (9), a synchronous signal sampling circuit (10), a frequency multiplication triangle wave generating circuit (11), an input current sampling circuit (12), an injection current setting circuit (13), a PWM signal driving circuit (14), a hysteresis comparator (15) and a capacitor C 1 And capacitor C 2 ；
The phase-shifting transformer (1) is used for shifting the phase of the three-phase voltage output by the power grid to generate two groups of three-phase voltages with the phase difference of 30 degrees, and the two groups of three-phase voltages with the phase difference of 30 degrees are respectively used as the input voltages of the first rectifier bridge (2) and the second rectifier bridge (3);
positive polarity output end of the first rectifier bridge (2) and a capacitor C 1 Is connected with the positive polarity end of the load (6) at the same time; the negative polarity output end of the first rectifier bridge (2) is simultaneously connected with the positive polarity end of the second rectifier bridge (3), the positive polarity end M of the output side of the auxiliary power factor correction circuit (5) and one end of the primary winding of the auxiliary single-phase transformer (4); the negative polarity end of the second rectifier bridge (3) and the negative polarity end N of the output side of the auxiliary power factor correction circuit (5) as well as the capacitor C 2 Is connected with the negative end of the load (6) at the same time;
the other end of the primary winding of the auxiliary single-phase transformer (4) is connected with the center tap output end D of the balancing reactor (7), and the two ends of the secondary winding of the auxiliary single-phase transformer (4) are respectively connected with the positive polarity end A and the negative polarity end B of the input side of the auxiliary power factor correction circuit (5);
one end of the balancing reactor (7) and a capacitor C 1 The other end of the balancing reactor (7) is connected with the capacitor C 2 Is connected with the other end of the connecting rod;
the synchronous signal sampling circuit (10) is used for synchronously collecting u a1 And u b1 And will synchronously acquire u a1 And u b1 After being sent to a 12-frequency multiplication triangular wave generating circuit (11), the triangular wave signal is generated and sent to an injection current setting circuit (13); wherein, the triangular wave signal generated by the 12 frequency multiplication triangular wave generating circuit (11) and the triangular wave signal output by the secondary winding of the auxiliary single-phase transformer (4) are the same in frequency, the same in phase and the sameStep, step (2);
u a1 an a-phase voltage among three-phase voltages inputted from the phase-shifting transformer (1) into the second rectifier bridge (3);
u b1 b-phase voltage of three-phase voltage input from the phase-shifting transformer (1) to the second rectifier bridge (3);
the load current sampling circuit (8) is used for collecting a load current signal i flowing through the load (6) d And the collected load current signal i d To an injection current setting circuit (13);
an injection current setting circuit (13) is used for setting the received generated triangular wave signal and the load current signal i d After multiplication, the resulting given signal i sref To the positive input of the subtractor (9);
an input current sampling circuit (12) is used for collecting the current flowing through the inductor L and being input into the auxiliary power factor correction circuit (5) s Is the current signal i of (2) sf And the acquired current signal i sf To the negative input of the subtractor (9);
Subtractor (9) applies a given signal i sref And current signal i sf Performing difference making, and sending a difference result to a hysteresis comparator (15); wherein a signal i is given sref As a subtracted number, the current signal i sf As a reduction;
the hysteresis comparator (15) is used for generating a control signal to drive and control the PWM signal driving circuit (14) according to the received difference result and the preset loop width, so that the PWM signal driving circuit (14) generates a corresponding PWM driving signal to assist the switching tube S in the power factor correction circuit (5) according to the received control signal 1 Is driven and controlled;
the preset loop width is equal to the difference value between the preset hysteresis boundary upper limit and the preset hysteresis boundary lower limit.
2. The series 12-pulse rectifier with auxiliary power factor correction circuit according to claim 1, characterized in that the auxiliary power factor correction circuit (5) is an auxiliary Boost type power factor correction circuit comprising a diode D 1 To D 5 Inductance L s And a switch tube S 1 ；
Diode D 1 Anode and diode D of (c) 3 Is used as an input side positive polarity end A of the auxiliary power factor correction circuit (5) after the cathode of the auxiliary power factor correction circuit is connected;
diode D 2 Anode and diode D of (c) 4 Is used as an input side negative polarity end B of the auxiliary power factor correction circuit (5) after the cathode of the auxiliary power factor correction circuit is connected;
Diode D 1 Cathode, diode D of (2) 2 Cathode and inductance L of (2) s Is connected at the same time;
diode D 3 Anode, diode D of (c) 4 Anode and switching tube S of (2) 1 Is used as the negative polarity end N of the output side of the auxiliary power factor correction circuit (5) after the anode is connected;
inductance L s And diode D 5 Anode and switching tube S of (2) 1 The cathodes of the electrodes are connected at the same time;
switch tube D 5 Is used as the positive polarity end M of the output side of the auxiliary power factor correction circuit (5).
3. The series 12-pulse rectifier with auxiliary power factor correction circuit according to claim 2, characterized in that the auxiliary power factor correction circuit (5) comprises 4 modes of operation, in particular:
working mode I: at t 0 Time of day, diode D 1 Switch tube S 1 And diode D 4 Conduction, diode D 2 Diode D 3 And diode D 5 Closing, the current i flowing through the positive polarity terminal A of the input side of the auxiliary power factor correction circuit (5) s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube S 1 And diode D 4 At this time, a voltage u between an input side positive polarity terminal A and an input side negative polarity terminal B of the auxiliary power factor correction circuit (5) s Added to the inductance L s On flowing through the inductance L s Current i on sf Linear riseInductance L s Storing energy;
at t 1 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the preset upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 1 ＞t 0 ；
Working mode II: at t 1 Time of day, diode D 2 Diode D 3 And a switch tube S 1 Turn-off, diode D 1 Diode D 4 And diode D 5 On the other hand, at this time, a current i flowing through the positive polarity terminal A on the input side of the auxiliary PFC circuit (5) s The propagation direction of (a) is still positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube D 5 Load (6) and diode D 4 Freewheel and current i flowing through inductance Ls sf Linear decrease;
at t 1 To t 2 During the period of time, inductance L s And a voltage u between the positive polarity terminal A of the input side and the negative polarity terminal B of the auxiliary power factor correction circuit (5) s Together charge the load (6);
at t 2 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 2 ＞t 1 ；
Working mode III: at t 3 To t 4 Diode D during a period of time 2 Switch tube S 1 And diode D 3 Conduction, diode D 1 Diode D 4 And diode D 5 Closing, the current i flowing through the negative polarity terminal B of the input side of the auxiliary power factor correction circuit (5) s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube S 1 And diode D 3 At this time, a voltage u between an input side positive polarity terminal A and an input side negative polarity terminal B of the auxiliary power factor correction circuit (5) s Added to the inductance L s On flowing through the inductance L s Is the current i of (2) sf Linearity ofRise, inductance L s Storing energy;
at t 4 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 ；
Working mode IV: at t 4 Time of day, diode D 1 Diode D 4 And a switch tube S 1 Turn-off, diode D 2 Diode D 3 And a switch tube D 5 Conducting, current i flowing through negative polarity terminal B of input side of auxiliary power factor correction circuit (5) s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube D 5 Load (6) and diode D 3 Freewheeling; wherein flows through the inductance L s Is the current i of (2) sf Linear decrease;
at t 4 To t 5 During the period of time, inductance L s And a voltage u input between an input side positive polarity terminal A and an input side negative polarity terminal B of the auxiliary power factor correction circuit (5) s Together charge the load (6);
at t 5 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 5 ＞t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 。
4. The serial 12 pulse wave rectifier with the auxiliary power factor correction circuit is characterized by comprising a phase-shifting transformer (1), a first rectifier bridge (2), a second rectifier bridge (3), a first auxiliary single-phase transformer (4), an auxiliary power factor correction circuit (5), a second auxiliary single-phase transformer (7), a load current sampling circuit (8), a subtracter (9), a synchronous signal sampling circuit (10), a 12 frequency multiplication triangular wave generating circuit (11), an input current sampling circuit (12), an injection current given circuit (13), a PWM signal driving circuit (14), a hysteresis comparator (15) and a capacitor C 1 And capacitor C 2 ；
The phase-shifting transformer (1) is used for shifting the phase of the three-phase voltage output by the power grid to generate two groups of three-phase voltages with the phase difference of 30 degrees, and the two groups of three-phase voltages with the phase difference of 30 degrees are respectively used as the input voltages of the first rectifier bridge (2) and the second rectifier bridge (3);
positive polarity output end of the first rectifier bridge (2) and a capacitor C 1 The positive polarity end P of the output side of the auxiliary power factor correction circuit (5) and the positive polarity end of the load (6) are connected at the same time, and the negative polarity end of the first rectifier bridge (2) and the positive polarity end of the second rectifier bridge (3) are connected at the endpoint O; negative polarity end of the second rectifier bridge (3) and a capacitor C 2 The negative polarity end N of the auxiliary power factor correction circuit (5) and the negative polarity end of the load (6) are connected at the same time;
one end B of the primary winding of the first auxiliary single-phase transformer (4) and a capacitor C 1 One end D of the primary winding of the second auxiliary single-phase transformer (7) is connected with a capacitor C 2 Is connected with the other end of the connecting rod,
the other end of the primary winding of the first auxiliary single-phase transformer (4) is connected with the other end of the primary winding of the second auxiliary single-phase transformer (7) at an end point A, and an end point O is connected with the end point A;
one end E of a secondary winding of the first auxiliary single-phase transformer (4) and one end F of a secondary winding of the second auxiliary single-phase transformer (7) are respectively connected with an input side positive polarity end E of the auxiliary power factor correction circuit (5) and an input side negative polarity end F of the auxiliary power factor correction circuit (5);
the other end of the secondary winding of the first auxiliary single-phase transformer (4) is connected with the other end of the secondary winding of the second auxiliary single-phase transformer (7);
the synchronous signal sampling circuit (10) is used for synchronously collecting u a1 And u b1 And will synchronously acquire u a1 And u b1 After being sent to a 12-frequency multiplication triangular wave generating circuit (11), the triangular wave signal is generated and sent to an injection current setting circuit (13); wherein, the triangular wave signal generated by the 12 frequency multiplication triangular wave generating circuit (11) and the triangular wave signal received by the input side of the auxiliary power factor correction circuit (5) are synchronous with the same frequency and the same phase;
u a1 An a-phase voltage among three-phase voltages inputted from the phase-shifting transformer (1) into the second rectifier bridge (3);
u b1 b-phase voltage of three-phase voltage input from the phase-shifting transformer (1) to the second rectifier bridge (3);
the load current sampling circuit (8) is used for collecting a load current signal i flowing through the load (6) d And the collected load current signal i d To an injection current setting circuit (13);
an injection current setting circuit (13) is used for setting the received generated triangular wave signal and the load current signal i d After multiplication, the resulting given signal i sref To the positive input of the subtractor (9);
an input current sampling circuit (12) is used for collecting the current flowing through the inductor L and being input into the auxiliary power factor correction circuit (5) s Is the current signal i of (2) sf And the acquired current signal i sf To the negative input of the subtractor (9);
subtractor (9) applies a given signal i sref And current signal i sf Performing difference making, and sending a difference result to a hysteresis comparator (15); wherein a signal i is given sref As a subtracted number, the current signal i sf As a reduction;
the hysteresis comparator (15) is used for generating a control signal to drive and control the PWM signal driving circuit (14) according to the received difference result and the preset loop width, so that the PWM signal driving circuit (14) generates a corresponding PWM driving signal to assist the switching tube S in the power factor correction circuit (5) according to the received control signal 1 Is driven and controlled;
the preset loop width is equal to the difference value between the preset hysteresis boundary upper limit and the preset hysteresis boundary lower limit.
5. The series 12-pulse rectifier with auxiliary power factor correction circuit according to claim 4, characterized in that the auxiliary power factor correction circuit (5) is an auxiliary Boost type power factor correction circuit, and the auxiliary Boost type power factor correction circuit comprises a diode D 1 To D 5 Inductance L s And a switch tube S 1 ；
Diode D 1 Anode and diode D of (c) 3 Is used as an input side positive polarity end E of the auxiliary power factor correction circuit (5) after the cathode of the auxiliary power factor correction circuit is connected;
diode D 2 Anode and diode D of (c) 4 Is used as the negative polarity end F of the input side of the auxiliary power factor correction circuit (5) after the cathode of the auxiliary power factor correction circuit is connected;
diode D 1 Cathode, diode D of (2) 2 Cathode and inductance L of (2) s Is connected at the same time;
diode D 3 Anode, diode D of (c) 4 Anode and switching tube S of (2) 1 Is used as the negative polarity end N of the output side of the auxiliary power factor correction circuit (5) after the anode is connected;
inductance L s And diode D 5 Anode and switching tube S of (2) 1 The cathodes of the electrodes are connected at the same time;
switch tube D 5 Is used as the positive polarity end M of the output side of the auxiliary power factor correction circuit (5).
6. The series 12-pulse rectifier with auxiliary power factor correction circuit according to claim 5, characterized in that the auxiliary power factor correction circuit (5) comprises 4 modes of operation, in particular:
working mode I: at t 0 Time of day, diode D 1 Switch tube S 1 And diode D 4 Conduction, diode D 2 Diode D 3 And diode D 5 Closing, the current i flowing through the positive polarity end E of the input side of the auxiliary power factor correction circuit (5) s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube S 1 And diode D 4 At this time, a voltage u between an input side positive polarity terminal E and an input side negative polarity terminal F of the auxiliary power factor correction circuit (5) s Added to the inductance L s On flowing through the inductance L s Current i on sf Linearly rise, inductance L s Storing energy;
at t 1 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the preset upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 1 ＞t 0 ；
Working mode II: at t 1 Time of day, diode D 2 Diode D 3 And a switch tube S 1 Turn-off, diode D 1 Diode D 4 And diode D 5 On the other hand, at this time, a current i flowing through the positive polarity terminal E of the input side of the auxiliary PFC circuit (5) s The propagation direction of (a) is still positive, specifically: current i s Sequentially flows through the diode D 1 Inductance L s Switch tube D 5 Load (6) and diode D 4 Freewheel and current i flowing through inductance Ls sf Linear decrease;
at t 1 To t 2 During the period of time, inductance L s And a voltage u between the positive polarity terminal E of the input side and the negative polarity terminal F of the auxiliary power factor correction circuit (5) s Together charge the load (6);
at t 2 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 2 ＞t 1 ；
Working mode III: at t 3 To t 4 Diode D during a period of time 2 Switch tube S 1 And diode D 3 Conduction, diode D 1 Diode D 4 And diode D 5 Closing, the current i flowing through the negative polarity end F of the input side of the auxiliary power factor correction circuit (5) s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube S 1 And diode D 3 At this time, a voltage u between an input side positive polarity terminal E and an input side negative polarity terminal F of the auxiliary power factor correction circuit (5) s Added to the inductance L s On flowing through the inductance L s Is the current i of (2) sf Linearly rise, electricitySense of L s Storing energy;
at t 4 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set upper limit of hysteresis boundary and switching tube S 1 Turning off, and ending the working mode; t is t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 ；
Working mode IV: at t 4 Time of day, diode D 1 Diode D 4 And a switch tube S 1 Turn-off, diode D 2 Diode D 3 And a switch tube D 5 Conducting, current i flowing through negative polarity terminal F of input side of auxiliary power factor correction circuit (5) s The propagation direction of (a) is positive, specifically: current i s Sequentially flows through the diode D 2 Inductance L s Switch tube D 5 Load (6) and diode D 3 Freewheeling; and flows through the inductance L s Is the current i of (2) sf Linear decrease;
at t 4 To t 5 During the period of time, inductance L s And a voltage u input between an input side positive polarity terminal E and an input side negative polarity terminal F of the auxiliary power factor correction circuit (5) s Together charge the load (6);
at t 5 At the moment, flows through the inductance L s Is the current i of (2) sf Reaching the set hysteresis boundary lower limit and switching tube S 1 Opening, and ending the working mode; t is t 5 ＞t 4 ＞t 3 ＞t 2 ＞t 1 ＞t 0 。
7. The series 12-pulse rectifier with auxiliary power factor correction circuit according to claim 3 or 6, characterized in that, among the 4 modes of operation of the auxiliary power factor correction circuit (5),
current i sf During the forward flow, the working mode I and the working mode II are alternately performed;
current i sf During the reverse flow, operation mode III and operation mode IV alternate.
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