CN1753294A - Direct current power supply apparatus and control method for the same, and a compressor drive apparatus - Google Patents
Direct current power supply apparatus and control method for the same, and a compressor drive apparatus Download PDFInfo
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- CN1753294A CN1753294A CNA2005101063579A CN200510106357A CN1753294A CN 1753294 A CN1753294 A CN 1753294A CN A2005101063579 A CNA2005101063579 A CN A2005101063579A CN 200510106357 A CN200510106357 A CN 200510106357A CN 1753294 A CN1753294 A CN 1753294A
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input 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
The present invention provides a DC power supply apparatus and a compressor driving apparatus utilizing the DC power supply apparatus, the DC power supply apparatus includes; a three-phase AC power supply, a reactor, a bridge type rectifying circuit, a electrolytic capacitor, a double-direction switch, a capacitor, a phase detection unit of the specified phase for detecting each phase voltage, a controller of double-direction switch, the two-way switches are turned on/off every half cycle of each phase voltage of the three-phase AC supply to repeatedly and alternately charge and discharge the capacitors through the reactors, thereby reducing high frequency current components and improving the input power factor. Thus, a DC power supply apparatus reduces high frequency current and improves the input power factor by a simple circuit arragement.
Description
Technical field
The present invention relates to three-phase alternating-current supply is transformed to direct current, and reduce the higher harmonic current flow through three-phase alternating-current supply, in the hope of continuous-current plant, the control method of the improvement of input power factor and the compressor drive apparatus that uses this continuous-current plant.
Background technology
In the past, three-phase alternating-current supply had been transformed in the continuous-current plant of direct current, and, was making much at electric current and remain the sinuous while and be transformed to the various combinations of direct current three-phase alternating-current supply in order to improve high order harmonic component and power factor.Particularly, taked following mode, it arrives driving switch element in the scope of tens of kHz at number kHz, and High-speed Control flows through the electric current of switch element, and following becomes the baseline sinusoidal wave of target shape.
For example,, have the reactor of each phase that is connected three-phase alternating-current supply and the 6 pairs of switch elements in parallel mutually and the bridge-type structure of diode pair as existing continuous-current plant, and with the inverter circuit combination of drive motor.
Below, utilize Figure 22 that existing continuous-current plant is described.Figure 22 represents to be recorded in the circuit diagram of power-converting device of the conventional example of patent documentation 1.The formation and the action of main circuit at first, are described.Three-phase alternating-current supply 1 is commercial AC power, is connected with bridge-type translation circuit 47 by reactor (reactor) 2U, 2V, 2W.Translation circuit 47, by 6 switch element TR1 to TR6, and 6 high speed diode FRD1 to FRD6 constitute, and carry out power converter by alternating-current/direct-current with this.Electrolytic capacitor 4, the output of smooth transformation circuit 47.Direct voltage after being somebody's turn to do smoothly by inverter circuit 24, and is transformed to interchange once more, and drives alternating current machine 48.
Next, illustrate about input power factor and remain when being approximately 1 sine wave the action of constant voltage control direct voltage the electric current of three-phase alternating-current supply.Isolator (isolator) the 29th with the voltage between lines of three-phase alternating-current supply, is reduced to desirable magnitude of voltage, with the state of AC power insulation under detect.By converter 30,, be transformed to the phase voltage of the benchmark that becomes the electric current that flows through each phase with detected voltage between lines.Voltage subtracter 31, the voltage of sampling electrolytic capacitor 4 and the difference of direct voltage benchmark 32.Voltage error amplifier 33 amplifies this difference.
In addition,,, multiply each other, and generate the desired value of each phase current with phase voltage from converter 30 output with the output of voltage error amplifier 33 by three multipliers 34 to 36.On the other hand, by three current detectors 37 to 39, detect the electric current that flows through each phase, by three subtracters 40 to 42, the difference of the desired value of output and each phase current is amplified this difference by three current error amplifiers 43 to 45.Result with after this amplification is sent to pwm control circuit 46, is here modulated by PWM.
So the signal based on after this PWM modulation by drive controlling switch element TR1 to TR6, makes by current detector 37 to the 39 detected electric currents that flow through each phase, and is consistent with the desired value of each phase current of being exported by 3 multipliers 34 to 36.By this, each phase current can be controlled as has the sine-wave current that is similar to 1 input power factor, and direct voltage controlled be made as constant.
Yet, in the structure of above-mentioned existing continuous-current plant, having that much to be used for exchange conversion be the switch element of direct current, its control is also very complicated.In addition, because employed reactor also is necessary it is the device with good high frequency performance, thereby the problem that exists cost to uprise.In addition, because switch element is driven to the high order harmonic component of tens of kHz to count kHz, so the loss of switch element and high speed diode, reactor etc. is bigger, has the generation level problem of higher of high-frequency noise.
Patent documentation: the spy opens flat 8-331860 communique.
Summary of the invention
The present invention solves the technology of described problem in the past just, its purpose be to reduce drive unit higher harmonic current, improve input power factor.
For solving above-mentioned problem in the past, continuous-current plant of the present invention constitutes: at three-phase alternating-current supply with have between the ac input end of bridge rectifier of 6 diodes, connect reactor at each on mutually, with the circuit of be connected in series both sides tropism's switch and capacitor, be connected between the ac input end and dc output end of each phase of bridge rectifier.So, carry out following action:, by with both sides tropism's switch conduction, and alternatively repeat the charging and the discharge of capacitor with commercial frequency based on institute's phase bit of each phase voltage.
By this, can make each phase current begin to rise, and can form sinuous current waveform from the voltage zero-crossing crunode of each phase.
According to first aspect present invention, a kind of continuous-current plant is provided, be used for supplying with direct current to load, comprising: three-phase alternating-current supply; Bridge rectifier, it is formed by 6 diodes; Electrolytic capacitor, it is connected the dc output end of described bridge rectifier; Reactor, it is connected between each ac input end mutually of described three-phase alternating-current supply and described bridge rectifier; Both sides tropism's switch, it is located between described ac input end and the described dc output end; Capacitor, it is connected with described both sides tropism's switch series connection; Phase detecting module, it detects the phase bit of giving in each phase voltage of described three-phase alternating-current supply, and the output phase detection signal; Both sides tropism's switch control module, it controls described both sides tropism's switch based on described phase detection signal.
According to second aspect present invention, described is the voltage zero-crossing crunode to phase bit.
According to third aspect present invention, described both sides tropism's switch control module based on the ON time instruction of the described voltage zero-crossing crunode and the timing of the described both sides tropism's switch conduction of expression, is controlled described both sides tropism's switch.
According to fourth aspect present invention, described capacitor is plugged between the ac input end and described both sides tropism's switch of described each phase.
According to fifth aspect present invention, described both sides tropism's switch, an end is connected with described ac input end, and the other end is connected with described dc output end by a public capacitor.
According to sixth aspect present invention, further be provided with the direct voltage detection module, it detects the VD of described bridge rectifier, and the output dc voltage value; When described dc voltage value surpasses set-point, or when being lower than set-point, described both sides tropism's switch control module disconnects described both sides tropism's switch.
According to seventh aspect present invention, further be provided with the direct voltage detection module, it detects the VD of described bridge rectifier, and the output dc voltage value; Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode, described dc voltage value and given direct voltage command value, control described both sides tropism's switch, equate with described direct voltage command value so that described dc voltage value becomes.
According to eighth aspect present invention, further be provided with the load current detection module, the load current of described load is flow through in its detection, and the output load current value; Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and described load current value, control described both sides tropism's switch.
According to ninth aspect present invention, further be provided with the input current detection module, the input current of described reactor is flow through in its detection, and the output input current value; Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and described input current value, control described both sides tropism's switch.
According to tenth aspect present invention, described phase detecting module comprises: single-phase voltage zero cross detection module, and it detects the voltage zero-crossing crunode of the phase in the described three-phase alternating-current supply; Two-phase voltage zero intersection computing module, it calculates the voltage zero-crossing crunode of other two-phases according to by the detected voltage zero-crossing crunode of described single-phase voltage zero cross detection module.
According to the present invention the tenth on the one hand, described phase detecting module comprises: voltage between lines zero cross detection module, and it detects arbitrary voltage between lines zero cross point of described three-phase alternating-current supply; And three-phase voltage zero crossing computing module, it calculates the described voltage zero-crossing crunode of each phase according to described voltage between lines zero cross point.
According to the present invention the 12 aspect, described reactor adopts by an iron core and three three-phase reactors that winding is formed.
According to the present invention the 13 aspect, described reactor adopts the saturable reactor that inductance reduces along with the increase of flowing through electric current.
According to the present invention the 14 aspect, a kind of compressor drive apparatus is provided, comprises: three-phase alternating current is transformed to the continuous-current plant of direct current and will will be the DC-to-AC converter of supplying with to compressor after the interchange of voltage variable and changeable frequency by the DC converting after the described continuous-current plant conversion.Described continuous-current plant comprises: three-phase alternating-current supply; Bridge rectifier, it is formed by 6 diodes; Electrolytic capacitor, it is connected the dc output end of described bridge rectifier; Reactor, it is connected between each ac input end mutually of described three-phase alternating-current supply and described bridge rectifier; Both sides tropism's switch, it is located between described ac input end and the described dc output end; Capacitor, it is connected with described both sides tropism's switch series connection; Phase detecting module, it detects the phase bit of giving in each phase voltage of described three-phase alternating-current supply, and the output phase detection signal; Both sides tropism's switch control module, it controls described both sides tropism's switch based on described phase detection signal.
According to the present invention the 15 aspect, described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and the rotation number command value set by described DC-to-AC converter, control described both sides tropism's switch.
According to the present invention the 16 aspect, further be provided with the rotation number detection module, it detects the rotation number of described compressor; Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and described detected rotation number, control described both sides tropism's switch.
According to the present invention the 17 aspect, a kind of control method of continuous-current plant is provided, be used to control continuous-current plant.Reactor between the bridge rectifier that described continuous-current plant comprises three-phase alternating-current supply, formed by 6 diodes, the electrolytic capacitor that connects with the dc output end of described bridge rectifier and each ac input end mutually of being connected described three-phase alternating-current supply and described bridge rectifier.Described control method has following steps: detect described three-phase alternating-current supply each phase voltage give phase bit; Based on detected phase place, control the on/off of the electric current between described ac input end and the described dc output end; By the on/off of electric current electric capacity is discharged and recharged.
Continuous-current plant of the present invention by having used the simple structure of both sides tropism's switch, is made sinusoidal wave shape with each phase current of three-phase alternating-current supply, and reduces higher harmonic current.Meanwhile, also can improve input power factor.In addition, the driving frequency of both sides tropism's switch is lower, and the electric current that flows through both sides tropism's switch only is the charging and discharging currents of capacitor.Therefore, compare, can reduce the loss and the generation of noise with existing bridge-type translation circuit in high frequency action.
Further, because capacitor is connected with three both sides tropism's switch series connection, thereby under the situation of both sides tropism's switch short circuit etc., overcurrent can not flow through in circuit inside yet, so the protective circuit that can cut down overcurrent sensing circuit and buffer circuit and so on.Under the situation of one of capacitor employing, can seek miniaturization and lightweight.Become in VD under the situation of abnormal voltage, can prevent the breakage of locking apparatus.Even there are external disturbance such as load change, also dc voltage value can be controlled to the direct voltage command value and equate, therefore can obtain stable VD.According to the change of load current, control also can allow VD stable from the increase and decrease of the input current of three-phase alternating-current supply.Even under the situation of the input current increase and decrease that causes by the unsteadiness of three-phase alternating-current supply etc., also can allow VD stable.In addition, by the simplification of phase detection device, cost degradation becomes possibility.By adopting three-phase reactor, installing all miniaturization and lightweight becomes possibility.If adopt the saturable reactor, the reduction of the VD in the time of can preventing heavy duty, the miniaturization and the lightweight of reactor become possibility.
Description of drawings
Fig. 1 is the block diagram of the continuous-current plant of first execution mode of the present invention.
Fig. 2 is the key diagram in capacitor 7U when beginning charging of first execution mode of the present invention.
Fig. 3 is the key diagram of the capacitor 7U charging of first execution mode of the present invention when finishing.
Fig. 4 is the key diagram in capacitor 7W when beginning discharge of first execution mode of the present invention.
Fig. 5 is the key diagram of the capacitor 7W discharge of first execution mode of the present invention when finishing.
Fig. 6 is the key diagram of the capacitor 7W discharge of first execution mode of the present invention when finishing back V phase current turn of tidal stream.
Fig. 7 is each phase voltage and both sides tropism's switch motion sequential chart of first execution mode of the present invention.
Fig. 8 is the U phase voltage of first execution mode of the present invention and the oscillogram of V phase voltage.
Fig. 9 is to use the structure chart of the zero cross detection portion of three-phase transformer.
Figure 10 is to use the structure chart of the zero cross detection portion of single-phase voltage zero cross detection portion.
Figure 11 is to use the structure chart of the zero cross detection portion of voltage between lines zero cross detection portion.
Figure 12 is the block diagram of the continuous-current plant of second execution mode of the present invention.
Figure 13 is the U phase voltage of second execution mode of the present invention and the oscillogram of condenser current.
Figure 14 is the block diagram of the continuous-current plant of the 3rd execution mode of the present invention.
Figure 15 is the block diagram of the continuous-current plant of the 4th execution mode of the present invention.
Figure 16 is the block diagram of the continuous-current plant of the 5th execution mode of the present invention.
Figure 17 is the block diagram of the continuous-current plant of the 6th execution mode of the present invention.
Figure 18 is the block diagram of the continuous-current plant of the 7th execution mode of the present invention.
Figure 19 is the block diagram of the continuous-current plant of the 8th execution mode of the present invention.
Figure 20 is the block diagram of the continuous-current plant of the 9th execution mode of the present invention.
Figure 21 is the block diagram of the continuous-current plant of the tenth execution mode of the present invention.
Figure 22 is to use the block diagram of the motor drive of continuous-current plant in the past.
Among the figure: the 1-three-phase alternating-current supply, 2U, 2V, 2W-reactor, 3-bridge-type rectification circuit, 3U, 3V, 3W, 3X, 3Y, 3Z-diode, 4-electrolytic capacitor, 5-load, 6U, 6V, 6W-both sides tropism switch, 7U, 7V, 7W-capacitor, 8-zero cross detection portion, 9-both sides tropism switch control part, 21-direct voltage test section, 22-load current test section, 23-input current test section, 24-inverter circuit, 25-inverter control part, the 26-compressor, 27-rotation number test section, 28-capacitor.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention, but for routine identical structure was additional identical symbol in the past and omit its detailed description.In addition, the explanation that launches in execution mode is the example that the present invention is specialized, and the present invention is not limited to these examples.In addition, the numeral of being recorded and narrated in the execution mode all is in order to specifically describe exemplary numbers of the present invention.The present invention is not limited to these numerals.
(first execution mode)
Fig. 1 is the block diagram of the continuous-current plant of first execution mode of the present invention.
In Fig. 1, each phase of the U of three-phase alternating-current supply 1, V, W by each reactor 2U, 2V, 2W, is connected each ac input end 3A, 3B, the 3C of the bridge rectifier 3 that is made of diode 3U, 3V, 3W, 3X, 3Y, 3Z.Electrolytic capacitor 4 is connected between the positive direct-current output 3D and negative dc output end 3E of bridge rectifier 3.Load 5 is connected in parallel with electrolytic capacitor 4.The end of each both sides tropism's switch 6U, 6V, 6W all is connected the negative dc output end 3E of bridge rectifier 3, their other end is connected to 7U, 7V, 7W.
The another terminal of these capacitors 7U, 7V, 7W is connected to ac input end 3A, 3B, the 3C of rectification circuit 3.In addition, the voltage zero-crossing crunode of each phase voltage of three-phase alternating-current supply 1 detects in zero cross detection portion 8, and exports zero cross signal PU, PV, the PW of expression voltage zero-crossing crunode respectively.Both sides tropism's switch control part 9 based on its detected each zero cross signal PU, PV, PW, and generates ON time instruction GU, GV, the GW of each phase, controls each both sides tropism's switch 6U, 6V, 6W.ON time instruction GU, GV, GW represent the timing of each both sides tropism's switch conduction.
Zero cross detection portion 8 and zero cross signal PU, PV, PW are respectively the embodiment of phase-detection portion 8 and phase signal PU, PV, PW.Phase-detection portion 8, detect three-phase alternating-current supply 1 each phase voltage give phase bit, and output phase detection signal PU, PV, PW respectively.Both sides tropism's switch control part 9 based on this detected phase detection signal PU, PV, PW, generates ON time instruction GU, GV, the GW of each phase, to control each both sides tropism's switch 6U, 6V, 6W.As giving phase bit, except the zero crossing of each phase voltage, can also select the phase places that detect easily such as 90 °, 270 °.Give the action timing of the instruction of phase bit and ON time GU, GV, GW, can change according to given time of delay.
After, in all execution modes, phase-detection portion 8 and phase detection signal PU, PV, PW are respectively as zero cross detection portion 8 and zero cross signal PU, PV, PW and illustrate.
In above structure, each phase voltage VU, VV, the VW of the U of three-phase alternating-current supply 1, V, W and each the phase input current IU, IV, the IW that flow through each reactor 2U, 2V, 2W by each reactor 2U, 2V, 2W, and act between the rectification circuit 3.Below utilize Fig. 2 to Fig. 7, its action, effect are described.Here,, suppose each capacitor 7U, 7V, 7W, carry out repeatedly lying prostrate discharging and recharging of given voltage VDC1 from zero in order easily to explain.The initial stage magnitude of voltage of supposing each capacitor 7U, 7V is zero volt, and the initial stage magnitude of voltage of capacitor 7W is VDC1.Supposing the initial stage phase place of three-phase alternating-current supply 1, is the phase place of the rising edge voltage zero-crossing crunode of U phase.The U phase input current IU based on U phase voltage VU of three-phase alternating-current supply 1 is that the center illustrates with the situation that flows through each phase, ignores based on the V phase input current IV of V phase voltage VV and based on the W phase input current IW of the W phase voltage VW contribution to each phase.
Fig. 2 to Fig. 6, expression flows to the U phase input current IU of bridge rectifier 3, the situation of time to time change from three-phase alternating-current supply 1.Fig. 7 represents the relation of the sequential of each phase voltage VU, VV, VW and the instruction of each ON time GU, GV, GW from the one-period that the rising edge voltage zero-crossing crunode of U phase voltage VU begins.
At first at moment T1, zero point, test section 8, detected the rising edge voltage zero-crossing crunode of the U phase of three-phase alternating-current supply 1.Both sides tropism's switch control part 9 generates ON time instruction GU, control both sides tropism switch 6U, and this ON time instruction GU only becomes the operate condition level at the rising edge voltage zero-crossing crunode from this U phase to switch motion time D T.That is to say, only from rising edge voltage zero-crossing crunode to the switch motion time D T, both sides tropism's switch 6U is placed in connection.At this moment, shown in the arrow of Fig. 2, the flow direction of the charging current of capacitor 7U is from the U of three-phase alternating-current supply 1 mutually, through reactor 2U, after capacitor 7U charging, through diode 3Y and reactor 2V, and returns the V phase of three-phase alternating-current supply 1.
Then, the moment T2 behind switch motion time D T, capacitor 7U is charged to VDC1, and both sides tropism's switch 6U is placed in disconnection, but the U phase input current IU of flow through reactor 2U, 2V and V input current IV Continuous Flow mistake mutually.Therefore, shown in the arrow of Fig. 3, U phase input current IU from U mutually, to after electrolytic capacitor 4 chargings, returns V phase by diode 3Y, reactor 2V by reactor 2U, diode 3U.
Thereafter, at moment T3, zero cross detection portion 8, the trailing edge voltage zero-crossing crunode of detection W phase.Both sides tropism's switch control part 9 generates ON time instruction GW, control both sides tropism switch 6W, and described switch controlling signal GW only becomes the operate condition level at the zero cross point from this W phase to switch motion time D T.At this moment, the U phase input current IU of Fig. 4, as shown by arrows, from being charged to the capacitor 7W of VDC1, by reactor 2W; From the U of three-phase alternating-current supply 1 mutually, through reactor 2U, diode 3U, be applied on it to the discharging current of electrolytic capacitor 4 discharges.At this moment, U phase input current IU continues to increase.
Moment T4 behind switch motion time D T, the voltage of capacitor 7W become zero volt.If both sides tropism's switch 6W is in ON, then shown in the arrow of Fig. 5, V phase input current IV and W mutually input current IW and U mutually input current IU become opposite polarity during, flow through the U phase input current IU of reactor 2U before this, by diode 3U electrolytic capacitor 4 is charged, and be diverted to two systems of diode 3Y and reactor 2V and diode 3Z and reactor 2W, and, turn back to reactor 2U through three-phase alternating-current supply 1.At moment T5 thereafter, if V phase input current IV and U input current IU mutually become identical polar, then flow through the U phase input current IU of reactor 2U as shown in Figure 6, by diode 3U electrolytic capacitor 4 is charged, by diode 3Z and reactor 2W, through three-phase alternating-current supply 1, turn back to reactor 2U.U phase input current IU continues to reduce monotonously, and until moment T6, current value becomes zero.
Though be conceived to U phase input voltage IU and its action is illustrated as top, the behavior of other phase currents also is same.Each phase input current IU, IV, IW begin to flow from the voltage zero-crossing crunode of each phase, and continue to increase to each phase voltage VU, VV, VW reaches peak value, thereafter, reduce along with the reduction of each phase voltage VU, VV, VW.By this, the waveform of this each phase input current IU, IV, IW becomes its phase place and each sine wave of equating of the phase place of the waveform of input voltage VU, VV, VW mutually, can reduce the electric current of high order harmonic component, and improve input power factor.In addition, as shown in Figure 7, between the switch motion time D T of the instruction of each ON time GU, GV, GW, each phase capacitor 7U, 7V, 7W in the positive half period of each phase voltage VU, VV, VW and charge to voltage VDC1, are discharged to zero volt in negative half-cycle.
In addition, in the first embodiment, because capacitor 7U, 7V, 7W and be connected each mutually both sides tropism's switch 6U, 6V, 6W each be connected in series, therefore, even produce under the situation of misoperation and short trouble at each both sides tropism's switch 6U, 6V, 6W, excessive electric current can not flow through in the inside of continuous-current plant yet.The protective circuits such as buffer circuit of therefore, can cut down overcurrent sensing circuit, under the situation that produces excessive electric current, moving.
Fig. 8 is illustrated in the voltage between lines of three-phase alternating-current supply 1 is made 200V, the inductance of each reactor 2U, 2V, 2W is made 8mH, the electric capacity of each capacitor 7U, 7V, 7W is made 100 μ F, the electric capacity of electrolytic capacitor 4 is made 4.7mF, T makes 2ms with the switch motion time D, and connect under the situation of resistance as load 5 of 12.9 Ω, U phase input voltage VU and U be the simulation waveform of input current IU mutually.At this moment, the both end voltage of electrolytic capacitor 4 is 271V, and input power is 6kW, and input power factor is 99.8%, and the aberration rate of the IU of U phase input current is 5.1%.Input power factor approximately is similar to 1, and the distortion of current waveform is very little, this shows, the effect that the high order harmonic component of first execution mode reduces and input power factor improves is big.
In addition, though in the first embodiment, the end of each both sides tropism's switch 6U, 6V, 6W also can be obtained same effect by the unified negative current output 3E that is connected bridge rectifier 3 even be connected on positive current output 3D.Therefore, certainly,, also can obtain same effect even capacitor 7U, 7V, 7W and both sides tropism's switch 6U, 6V, 6W are replaced separately.
In addition, in the first embodiment,, begin the ON Action of each both sides tropism's switch 6U, 6V, 6W in the moment of the voltage zero-crossing crunode of each phase., under the bigger situation of the inductance of each reactor 2U, 2V, 2W and during high capacity, there are the situation that becomes the negative power factor in each phase input current IU, IV, IW.At this moment, when each both sides tropism's switch 6U, 6V, 6W are in connection, there is the problem that does not become Zero Current Switch.For fear of this situation, also can constitute both sides tropism's switch control part 9, so that each both sides tropism's switch 6U, 6V, 6W are in the moment of ON Action, only postpone given time of delay with respect to the voltage zero-crossing crunode.
In addition, in the first embodiment, the voltage zero-crossing crunode as starting point, through after given time of delay, is begun the ON Action of each both sides tropism's switch 6U, 6V, 6W, only be in the ON Action state at switch motion time D T.But, also can at first determine the moment that ON Action stops with the voltage zero-crossing crunode as starting point, both sides tropism's switch control part 9 is only constituted the time is returned switch motion time D T backward and begins ON Action.By this structure, also can control the time of delay that begins from the voltage zero-crossing crunode to ON Action.
Fig. 9 is the circuit diagram of the concrete example of expression zero cross detection portion 8.As shown in Figure 9, by three-phase transformer 10, it is star-star connection with elementary, primary side, so that can detect each phase voltage VU, VV, VW after carrying out step-down on the basis of insulation; And each zero crossing comparator 11U, 11V, 11W constitute.
In contrast, also can constitute by single-phase voltage zero cross detection portion 12 and two-phase voltage zero intersection operational part 13 as shown in figure 10.The zero cross point of arbitrary phase voltage in the three-phase alternating-current supply 1 detects in single-phase voltage zero cross detection portion 12.Two-phase voltage zero intersection operational part 13 according to the voltage zero-crossing crunode of a detected phase, calculates the voltage zero-crossing crunode of other two-phases.
Here, single-phase voltage zero cross detection portion 12 is contained: each divider resistance 14U, 14V, 14W, photoelectrical coupler 15, pull-up resistor 16 and delay circuit 17.Each divider resistance 14U, 14V, 14W are by each phase U, V of three-phase alternating-current supply 1, W and obtain supposing neutral point.As for photoelectrical coupler 15, its primary side and divider resistance 14U are connected in series, flow through at divider resistance 14 under the situation of the electric current more than the given electric current, the transistor turns of primary side produces thus with the voltage zero-crossing crunode of the U phase voltage zero cross pulse as the center.Delay circuit 17 intersects consistent mode and postpones to transmit after the given time according to the voltage that makes zero cross pulse begin to descend moment of changing and voltage zero.
So the two-phase voltage zero is intersected operational part 13, according to cycle, calculate the frequency of three-phase alternating-current supply 1 by the voltage zero-crossing crunode of single-phase voltage zero cross detection portion 12 detected U phases, and according to the time D TS1 of this frequency computation part with respect to 120 ° at phase angle.So, to only lag behind the pulse of DTS1 as the voltage zero-crossing crunode of V phase than U phase voltage zero cross point, further will only lag behind the pulse of DTS1 as the voltage zero-crossing crunode of W phase, and will represent each zero cross signal PU, PV, the PW of the voltage zero-crossing crunode of these each phases to output to both sides tropism's switch control part 9.
Constitute as above zero cross detection portion 8 by mode, do not need to be used for detecting the three-phase transformer 10 of each phase voltage, promptly can detect the voltage zero-crossing crunode, and can realize miniaturization and cost degradation with three-phase alternating-current supply 1 insulation with Figure 10.
In addition, in Figure 10, by delay circuit 17 with the output delay of photoelectrical coupler 15.But, also can postpone by the timing of the action of connecting each both sides tropism's switch 6U, 6V, 6W.At this moment, also can omit delay circuit 17, and with the output of the primary side transistor voltage of photoelectrical coupler 15, as the output of single-phase voltage zero cross detection portion 12 and use.
Further as shown in figure 11, also can utilize the voltage between lines between the U-V that detects three-phase alternating-current supply 1 zero cross point voltage between lines zero cross detection portion 18 and calculate the three-phase voltage zero crossing operational part 19 of each phase voltage zero cross point of three-phase according to the voltage between lines zero cross point between U-V, constitute zero cross detection portion 8.
Here, zero cross detection portion 18 between line is made of the detection resistance 20 between the U-V that is connected three-phase alternating-current supply 1, photoelectrical coupler 15 and pull-up resistor 16.As for photoelectrical coupler 15, its primary side is connected in series with detection resistance 20, in detecting resistance 20, flow through under the situation of the electric current more than the given electric current, by making the transistor turns of primary side, and generate the voltage zero-crossing crunode of the voltage between lines between U-V zero cross pulse as the center.
Three-phase voltage zero crossing operational part 19 is the zero cross pulse at center by output photoelectrical coupler 15 with the voltage between lines zero cross point, and according to the width of this zero cross pulse, at first with this central point as the voltage between lines zero cross point between U-V.
Next, according to the frequency of the computation of Period three-phase alternating-current supply 1 of this zero cross pulse, and, calculate time D TS1 that is equivalent to 120 ° at phase angle and the time D TS2 that is equivalent to 30 ° at phase angle according to this frequency.And then, with only than the time point of the voltage between lines zero cross point hysteresis DTS2 between U-V voltage zero-crossing crunode as the U phase, to put the voltage zero-crossing crunode of the time point of further hysteresis DTS1 than this as the V phase, with the time point of the DTS1 that further lags behind again voltage zero-crossing crunode, and output to both sides tropism's switch control part 9 as the W phase.
More than, constitute zero cross detection portion 8 by mode with Figure 11, do not need to be used for detecting the three-phase transformer 10 of each phase voltage with three-phase alternating-current supply 1 insulation, promptly can detect the voltage zero-crossing crunode.Though the processing in the three-phase voltage zero crossing operational part 19 is complicated, than Figure 10, can further do miniaturization and cost degradation.
In addition, in this case, also have following advantage point, promptly also can set the time of delay that is in ON Action from the voltage zero-crossing crunode to each both sides tropism's switch 6U, 6V, 6W arbitrarily according to circuit characteristic.
In addition, though use three reactor 2U, 2V, 2W in the first embodiment, also can use to have the three-phase reactor of this being made an iron core and the structure of winding being set on three limits.Three-phase reactor, because of it utilizes the electric current summation of each phase is zero this characteristic, thereby, has the less advantage that can realize of its iron core use amount of inductance, all miniaturization and the lightweights of implement device effectively for obtaining being equal to than the situation of using 3 single-phase reactors.
In the first embodiment, be illustrated with Fig. 2 to Fig. 7, because discharging and recharging that each both sides tropism's switch 6U, each capacitor 7U, 7V of 6V, 6W, 7W are interrupted, so the both end voltage of each reactor 2U, 2V, 2W does not become sine wave.The input current from three-phase alternating-current supply 1 becomes sine wave, does not also flow through the path of Zero-phase current, but because its summation is generally zero, so three-phase reactor can be suitable for.
In addition, in the first embodiment, the inductance characteristic of each reactor 2U, 2V, 2W does not have special provision.Here, also this inductance characteristic can be set for from the point that surpasses given current value and inductance reduces, and with each reactor 2U, 2V, 2W as so-called saturable reactor.
At this moment, under the situation that the voltage of three-phase alternating-current supply 1 reduces when heavy duty, can prevent because the decline of the VD that the voltage decline of each reactor 2U, 2V, 2W causes.Meanwhile, when VD descends,, also can prevent the reduction of the power factor that causes thus though produce the phase deviation of input current and supply voltage.
(second execution mode)
Figure 12 is the block diagram of the continuous-current plant of second execution mode of the present invention.
Figure 12, replaces with both sides tropism's switch 6U, 6V, 6W respectively, and becomes the structure that is integrated into a capacitor 28 configuration of capacitor 7U, 7V, 7W with respect to the block diagram of the continuous-current plant of first execution mode.
In second execution mode, with respect to first execution mode, for the control of the ON Action of each both sides tropism's switch 6U, 6V, 6W and regularly and the electric current that flows through each both sides tropism's switch 6U, 6V, 6W and bridge-type DC circuit 3 be identical, about the improvement of input power factor and the reduction effect of high order harmonic component also are equal to.Difference is to make the structure that the electric current that flows through each capacitor 7U, 7V, 7W in the first embodiment all flows through capacitor 28, and what flow through charging current in capacitor 28 is different with what flow out discharging currents from capacitor 28 mutually.
Below with the above-mentioned difference of figure explanation.Figure 13 represents the voltage VU of U phase and flows through the electric current I C of capacitor 28.According to shown in Figure 13, in the first embodiment, the flow through electric current of each capacitor 7U, 7V, 7W, each positive and negative half period in supply frequency, alternatively charge repeatedly and discharge, on the contrary, in second execution mode, the flow through electric current of capacitor 28 becomes the situation that the electric current of 3 overtones bands that are equivalent to supply frequency flows through.
In addition, the capacitor 28 that charges by the charging current of U phase is connected by both sides tropism's switch 6U of U phase, by the both sides tropism's switch 6W that connects then, and moves to flow through the mode of W phase discharge electric current mutually at W.So, after flowing through V phase charging current mutually, flow through U phase discharge electric current mutually in U by V, then after flowing through W phase charging current mutually, flow through V phase discharge electric current mutually, and finish the action of one-period in V by W.Like this, different with first execution mode, in second execution mode, flow through mutually different that the electric charge with after will charging of charging current flows through as discharging current.
So; in second execution mode; each capacitor 7U, 7V, 7W than first execution mode; be necessary to do the current capacity of capacitor 28 bigger; though can not cut down protective circuit as the super-high-current that prevents each both sides tropism's switch 6U, 6V, 6W of first execution mode; but, be effective therefore for the preferential situation of miniaturization owing to can cut down two capacitors.
In addition, in second execution mode,, also can obtain same effect even be connected positive direct-current output 3D though make the structure that capacitor 28 is connected with the negative dc output end 3E of bridge rectifier 3.
(the 3rd execution mode)
Figure 14 is the block diagram of the DC power supply output device of the 3rd execution mode of the present invention.
Figure 14 is provided with respect to the block diagram of the continuous-current plant of first execution mode of Fig. 1: the direct voltage test section 21 of the VD at the two ends of detection electrolytic capacitor 4 and the unusual electric voltage exception test section 51 that detects detected dc voltage value.
The common action of the 3rd execution mode, identical with first execution mode, control both sides tropism's switch 6U, 6V, 6W by both sides tropism's switch control part 9, and when improving input power factor and reducing higher harmonic current, direct current power is supplied to load 5.
Here, possible, because of the sudden turn of events of load 5 or the misoperation of both sides tropism's switch control part 9 etc., and the abnormal ascending and unusual decline that cause VD.Different is: in the 3rd execution mode, in this case, utilize direct voltage abnormity detection portion 51, detect unusual by the detected dc voltage value of direct voltage test section 21, and utilize both sides tropism's switch control part 9 to allow each both sides tropism's switch 6U, 6V, 6W disconnect.By the action of arresting stop when VD is unusual by this way, and the destruction that can prevent locking apparatus.
(the 4th execution mode)
Figure 15 is the block diagram of the DC power supply output device of the 4th execution mode of the present invention.
Figure 15 is with respect to the block diagram of the continuous-current plant of first execution mode of Fig. 1, become following structure: be provided with the direct voltage test section 21 of VD at the two ends of detecting electrolytic capacitor 4 and the direct voltage instruction department 50 of setting direct voltage command value DCT, and in both sides tropism's switch control part 9 input by zero cross signal PU, the PV of each detected phase of zero cross detection portion 8, PW, by detected dc voltage value DC of direct voltage test section 21 and the direct voltage command value DTC that sets by direct voltage instruction department 50.
Below, this action is described.In the 4th execution mode, from the voltage zero-crossing crunode of each phase, each both sides tropism's switch 6U of beginning correspondence, the ON Action of 6V, 6W, this point is identical with first execution mode.But, difference is: in the 4th execution mode, its switch motion time D T is fixing, and consistent by the variable direct voltage command value DCT that is controlled to be and is set by direct voltage instruction department 50 by the detected dc voltage value DC of direct voltage test section 21.
That is to say, move, so that it is be lower than the switch motion time D T that prolongs twocouese switch 6U, 6V, 6W under the situation of direct voltage command value DCT at detected dc voltage value DC, opposite under the situation that is higher than direct voltage command value DCT and shorten it.Move in such a manner by both sides tropism's switch control part 9, can bring into play the effect of improving input power factor and reducing high order harmonic component, even and, also can stably control the VD of bridge rectifier 3 for the change of load 5 and the variation in voltage of three-phase alternating-current supply 1.
In addition, though the direct voltage command value DCT of the 4th execution mode can be made as set-point, but also can be set at variable value, can certainly make according to from the instruction of continuous-current plant outside and the mode of the VD of variable control bridge rectifier 3.
(the 5th execution mode)
Figure 16 is the block diagram of the DC power supply output device of the 5th execution mode of the present invention.
Figure 16 is with respect to the block diagram of the continuous-current plant of first execution mode of Fig. 1, become following structure: be provided with the load current test section 22 that detects the electric current flow through load 5, and in both sides tropism's switch control part 9 input by each detected phase zero cross signal PU of zero cross detection portion 8, PV, PW and by the detected load current value IR of load current test section 22.
Below, this action is described.In the 5th execution mode, from the voltage zero-crossing crunode of each phase, each both sides tropism's switch 6U of beginning correspondence, the ON Action of 6V, 6W, this point is identical with first execution mode.But difference is for being: in the 5th execution mode, its switch motion time D T is unfixing, according to the variable control by load current test section 22 detected load current value IR.
That is to say, move, so that it is under detected load current value IR condition with higher, prolong the switch motion time D T of twocouese switch 6U, 6V, 6W, opposite under the lower situation of detected load current value IR and shorten it.Move in such a manner by both sides tropism's switch control part 9, can bring into play the effect of improving input power factor and reduction high order harmonic component according to the change of load 5, and can control input current.
(the 6th execution mode)
Figure 17 is the block diagram of the DC power supply output device of the 6th execution mode of the present invention.
Figure 17 is with respect to the block diagram of the continuous-current plant of first execution mode of Fig. 1, become following structure: be provided with the input current test section 23 that detects the input current flow through three-phase alternating-current supply 1, and in both sides tropism's switch control part 9 input by each detected phase zero cross signal PU of zero cross detection portion 8, PV, PW and by the detected input current value IF of input current test section 23.
Below, this action is described.In the 6th execution mode, from the voltage zero-crossing crunode of each phase, each both sides tropism's switch 6U of beginning correspondence, the ON Action of 6V, 6W, this point is identical with first execution mode.But difference is: in the 6th execution mode, its switch motion time D T is unfixing, according to the variable control by input current test section 23 detected input current value IF.
That is to say, move, so that it is under detected input current value IF condition with higher, prolong the switch motion time D T of twocouese switch 6U, 6V, 6W, opposite under the lower situation of detected input current value IF and shorten it.Move in such a manner by both sides tropism's switch control part 9, can bring into play based on the variation of the corresponding input current of change of load 5, and improve input power factor and reduce the effect of high order harmonic component, and can control input current.
In addition, in Figure 17, make the structure of the electric current of a phase that only detects three-phase alternating-current supply 1, this is because of the electric current that flows through each phase about equally.But, considering by the structure of three-phase alternating-current supply 1 unevenly and cause the situation of the unbalanced problem of each phase current, perhaps also double as is an overcurrent situation about detecting etc., also can constitute the mode of the electric current that detects two-phase or three-phase.
(the 7th execution mode)
Figure 18 is the block diagram of the compressor drive apparatus of the 7th execution mode of the present invention.
Figure 18 becomes following structure: be provided with inverter circuit 24, inverter control part 25 and by inverter circuit 24 compressor driven 26, substitute the load 5 of the first execution mode continuous-current plant.Inverter circuit 24 and inverter control part 25 are generically and collectively referred to as DC-to-AC converter.DC-to-AC converter will be transformed to the interchange of voltage variable, changeable frequency, and be supplied to compressor 26 by the direct current of continuous-current plant institute conversion.
In the 7th execution mode alternating electromotive force of three-phase alternating-current supply 1 is transformed to the action of direct current power, the same with first execution mode.By both sides tropism's switch control part 9, control each both sides tropism's switch 6U, 6V, 6W, improve input power factor and reduce higher harmonic current, simultaneously direct current power is supplied to inverter circuit 24.Inverter circuit 24 by inverter control part 25, is interchange with DC converting, and Driven Compressor 26.
In addition, in the 7th execution mode, will be integrated into a capacitor 28 as three capacitor 7U, 7V, 7W of second execution mode equally, and therefore also can seek the miniaturization and the lightweight of device integral body.
(the 8th execution mode)
Figure 19 is the block diagram of the compressor drive apparatus of the 8th execution mode of the present invention.
Figure 19 becomes the structure from inverter control part 25 output rotation number command value RT to both sides tropism's switch control part 9 with respect to the block diagram of the compressor drive apparatus of the 7th execution mode.
In the 8th execution mode, the alternating electromotive force of three-phase alternating-current supply 1 is transformed to the action of direct current power, be to begin each corresponding both sides tropism's switch 6U, the ON Action of 6V, 6W from the voltage zero-crossing crunode of each phase, this point is identical with first execution mode.But difference is: in the 8th execution mode, its switch motion time D T is fixing, according to the rotation number command value RT that outputs to both sides tropism's switch control part 9 from inverter control part 25, and control switch DT operate time changeably.That is to say, move, so that it is be provided under the rotation number command value RT condition with higher of both sides tropism's switch control part 9 the switch motion time D T that prolongs twocouese switch 6U, 6V, 6W, opposite under the lower situation of the rotation number command value RT that is provided to both sides tropism's switch control part 9 and shorten it.
Move in such a manner by both sides tropism's switch control part 9, can bring into play the effect of improving input power factor and reduction high order harmonic component according to the load change of inverter circuit 24, and can control input current.
(the 9th execution mode)
Figure 20 is the block diagram of the compressor drive apparatus of the 9th execution mode of the present invention.
Figure 20 becomes the structure of the rotation number test section 27 that is provided with the rotation number NR that detects compressor 26 with respect to the block diagram of the compressor drive apparatus of the 7th execution mode.
In the 9th execution mode, the alternating electromotive force of three-phase alternating-current supply 1 is transformed to the action of direct current power, be to begin each corresponding both sides tropism's switch 6U, the ON Action of 6V, 6W from the voltage zero-crossing crunode of each phase, this point is identical with first execution mode.But difference is: in the 9th execution mode, its switch motion time D T is unfixing, according to the control changeably by the rotation number NR of the compressor 26 that rotation number test section 27 detected.
That is to say, move, so that it is under the rotation number NR condition with higher that is provided to both sides tropism's switch control part 9, prolong the switch motion time D T of twocouese switch 6U, 6V, 6W, opposite under the lower situation of the rotation number NR that is provided to both sides tropism's switch control part 9 and shorten it.
Move in such a manner by both sides tropism's switch control part 9, can bring into play the effect of improving input power factor and reduction high order harmonic component according to the load change of inverter circuit 24, and can control input current.
(the tenth execution mode)
Figure 21 is the block diagram of the compressor drive apparatus of the tenth execution mode of the present invention.
Figure 21 is with respect to the block diagram of the compressor drive apparatus of the 7th execution mode, and is the same with the 4th execution mode, becomes the structure that is provided with direct voltage test section 21 and direct voltage instruction department 50.
In the tenth execution mode, from the voltage zero-crossing crunode of each phase, each both sides tropism's switch 6U of beginning correspondence, the ON Action of 6V, 6W, this point is identical with first execution mode.But, difference is: in the tenth execution mode, its switch motion time D T is unfixing, is with the variable control by the direct voltage test section 21 detected dc voltage value DC modes consistent with the direct voltage command value DCT that is set by direct voltage instruction department 50.
That is to say, move, so that under the situation that is lower than direct voltage command value DCT by direct voltage test section 21 detected dc voltage value DC, prolong the switch motion time D T of twocouese switch 6U, 6V, 6W, shorten it being higher than under the direct voltage command value DCT situation on the contrary.
Move in such a manner by both sides tropism's switch control part 9, can bring into play the effect of improving input power factor and reducing high order harmonic component, even for the situation of the variation in voltage of the load change of inverter circuit 24 or three-phase alternating-current supply 1, also can stably control the VD of bridge rectifier 3.
In addition, though the direct voltage command value DCT of the tenth execution mode becomes the form that is input to both sides tropism's switch control part 9 among Figure 21 in advance, this direct voltage command value DCT can be a set-point, also can be variable value.For example also can constitute with the form of giving by inverter control part 25.In this case, according to the rotation number of compressor 26 or the duty ratio (on-duty) of inverter circuit 24 etc., determine only VD as direct voltage command value DCT, and compressor drive apparatus is turned round expeditiously.
Like this, because continuous-current plant involved in the present invention can reduce the higher harmonic current of three-phase alternating-current supply and improve input power factor, therefore can be used for electroplating with rectifier as continuous-current plant that can variable control output voltage etc.In addition, compressor drive apparatus involved in the present invention also can be used for the tame electric machine that air-conditioning and refrigerator etc. use compressor.
Claims (27)
1, a kind of continuous-current plant is used for supplying with direct current to load, comprising:
Three-phase alternating-current supply;
Bridge rectifier, it is formed by 6 diodes;
Electrolytic capacitor, it is connected the dc output end of described bridge rectifier;
Reactor, it is connected between each ac input end mutually of described three-phase alternating-current supply and described bridge rectifier;
Both sides tropism's switch, it is located between described ac input end and the described dc output end;
Capacitor, it is connected with described both sides tropism's switch series connection;
Phase detecting module, it detects the phase bit of giving in each phase voltage of described three-phase alternating-current supply, and the output phase detection signal;
Both sides tropism's switch control module, it controls described both sides tropism's switch based on described phase detection signal.
2, continuous-current plant according to claim 1 is characterized in that, described is the voltage zero-crossing crunode to phase bit.
3, continuous-current plant according to claim 1, it is characterized in that, described both sides tropism's switch control module based on the ON time instruction of the described voltage zero-crossing crunode and the timing of the described both sides tropism's switch conduction of expression, is controlled described both sides tropism's switch.
4, continuous-current plant according to claim 1 is characterized in that, described capacitor is plugged between the ac input end and described both sides tropism's switch of described each phase.
5, continuous-current plant according to claim 1 is characterized in that, described both sides tropism's switch, and an end is connected with described ac input end, and the other end is connected with described dc output end by a public capacitor.
6, according to each described continuous-current plant in the claim 2～5, it is characterized in that,
Further be provided with the direct voltage detection module, it detects the VD of described bridge rectifier, and the output dc voltage value;
When described dc voltage value surpasses set-point, or when being lower than set-point, described both sides tropism's switch control module disconnects described both sides tropism's switch.
7, according to each described continuous-current plant in the claim 2～5, it is characterized in that,
Further be provided with the direct voltage detection module, it detects the VD of described bridge rectifier, and the output dc voltage value;
Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode, described dc voltage value and given direct voltage command value, control described both sides tropism's switch, equate with described direct voltage command value so that described dc voltage value becomes.
8, according to each described continuous-current plant in the claim 2～5, it is characterized in that,
Further be provided with the load current detection module, the load current of described load is flow through in its detection, and the output load current value;
Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and described load current value, control described both sides tropism's switch.
9, according to each described continuous-current plant in the claim 2～5, it is characterized in that,
Further be provided with the input current detection module, the input current of described reactor is flow through in its detection, and the output input current value;
Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and described input current value, control described both sides tropism's switch.
10, according to each described continuous-current plant in the claim 2～5, it is characterized in that,
Described phase detecting module comprises:
Single-phase voltage zero cross detection module, it detects the voltage zero-crossing crunode of the phase in the described three-phase alternating-current supply;
Two-phase voltage zero intersection computing module, it calculates the voltage zero-crossing crunode of other two-phases according to by the detected voltage zero-crossing crunode of described single-phase voltage zero cross detection module.
11, according to each described continuous-current plant in the claim 2～5, it is characterized in that,
Described phase detecting module comprises:
Voltage between lines zero cross detection module, it detects arbitrary voltage between lines zero cross point of described three-phase alternating-current supply; And
Three-phase voltage zero crossing computing module, it calculates the described voltage zero-crossing crunode of each phase according to described voltage between lines zero cross point.
According to each described continuous-current plant in the claim 2～5, it is characterized in that 12, described reactor adopts by an iron core and three three-phase reactors that winding is formed.
According to each described continuous-current plant in the claim 2～5, it is characterized in that 13, described reactor adopts the saturable reactor that inductance reduces along with the increase of flowing through electric current.
14, a kind of compressor drive apparatus comprises: three-phase alternating current is transformed to the continuous-current plant of direct current and will be the DC-to-AC converter of supplying with to compressor after the interchange of voltage variable and changeable frequency by the DC converting after the described continuous-current plant conversion,
Described continuous-current plant comprises:
Three-phase alternating-current supply;
Bridge rectifier, it is formed by 6 diodes;
Electrolytic capacitor, it is connected the dc output end of described bridge rectifier;
Reactor, it is connected between each ac input end mutually of described three-phase alternating-current supply and described bridge rectifier;
Both sides tropism's switch, it is located between described ac input end and the described dc output end;
Capacitor, it is connected with described both sides tropism's switch series connection;
Phase detecting module, it detects the phase bit of giving in each phase voltage of described three-phase alternating-current supply, and the output phase detection signal;
Both sides tropism's switch control module, it controls described both sides tropism's switch based on described phase detection signal.
15, compressor drive apparatus according to claim 14 is characterized in that, described is the voltage zero-crossing crunode to phase bit.
16, compressor drive apparatus according to claim 14, it is characterized in that, described both sides tropism's switch control module based on the ON time instruction of the described voltage zero-crossing crunode and the timing of the described both sides tropism's switch conduction of expression, is controlled described both sides tropism's switch.
17, compressor drive apparatus according to claim 14 is characterized in that, described capacitor is plugged between the ac input end and described both sides tropism's switch of described each phase.
18, compressor drive apparatus according to claim 14 is characterized in that, described both sides tropism's switch, and an end is connected with described ac input end, and the other end is connected with described dc output end by a public capacitor.
19, according to each described compressor drive apparatus in the claim 15～18, it is characterized in that,
Further be provided with the direct voltage detection module, it detects the VD of described bridge rectifier, and the output dc voltage value;
When described dc voltage value surpasses set-point, or when being lower than set-point, described both sides tropism's switch control module disconnects described both sides tropism's switch.
20, according to each described compressor drive apparatus in the claim 15～18, it is characterized in that,
Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and the rotation number command value set by described DC-to-AC converter, control described both sides tropism's switch.
21, according to each described compressor drive apparatus in the claim 15～18, it is characterized in that,
Further be provided with the rotation number detection module, it detects the rotation number of described compressor;
Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode and described detected rotation number, control described both sides tropism's switch.
22, according to each described compressor drive apparatus in the claim 15～18, it is characterized in that,
Further be provided with the direct voltage detection module, it detects the VD of described bridge rectifier, and the output dc voltage value;
Described both sides tropism's switch control module constitutes: based on described voltage zero-crossing crunode, described dc voltage value and given direct voltage command value, control described both sides tropism's switch, equate with described direct voltage command value so that described dc voltage value becomes.
23, according to each described compressor drive apparatus in the claim 15～18, it is characterized in that,
Described phase detecting module comprises:
Single-phase voltage zero cross detection module, it detects the voltage zero-crossing crunode of the phase in the described three-phase alternating-current supply;
Two-phase voltage zero intersection computing module, it calculates the voltage zero-crossing crunode of other two-phases according to by the detected voltage zero-crossing crunode of described single-phase voltage zero cross detection module.
24, according to each described compressor drive apparatus in the claim 15～18, it is characterized in that,
Described phase detecting module comprises:
Voltage between lines zero cross detection module, it detects arbitrary voltage between lines zero cross point of described three-phase alternating-current supply; And
Three-phase voltage zero crossing computing module, it calculates the described voltage zero-crossing crunode of each phase according to described voltage between lines zero cross point.
According to each described compressor drive apparatus in the claim 15～18, it is characterized in that 25, described reactor adopts by an iron core and three three-phase reactors that winding is formed.
According to each described compressor drive apparatus in the claim 15～18, it is characterized in that 26, described reactor adopts the saturable reactor that inductance reduces along with the increase of flowing through electric current.
27, a kind of control method of continuous-current plant is used to control continuous-current plant,
Reactor between the bridge rectifier that described continuous-current plant comprises three-phase alternating-current supply, formed by 6 diodes, the electrolytic capacitor that connects with the dc output end of described bridge rectifier and each ac input end mutually of being connected described three-phase alternating-current supply and described bridge rectifier
Described control method has following steps:
Detect described three-phase alternating-current supply each phase voltage give phase bit;
Based on detected phase place, control the on/off of the electric current between described ac input end and the described dc output end;
By the on/off of electric current electric capacity is discharged and recharged.
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| JP2004275312 | 2004-09-22 | ||
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| CN101647184B (en) * | 2007-03-30 | 2013-03-27 | 大金工业株式会社 | Power supply device |
| CN103008804A (en) * | 2012-12-12 | 2013-04-03 | 上海新维机电工程技术有限公司 | Direct-current power supply device for electrical cutting |
| CN103124145A (en) * | 2011-11-17 | 2013-05-29 | 东芝开利株式会社 | Three-phase rectifying device |
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| CN103124145B (en) * | 2011-11-17 | 2015-05-27 | 东芝开利株式会社 | Three-phase rectifying device |
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| CN103812366A (en) * | 2012-11-08 | 2014-05-21 | 上海儒竞电子科技有限公司 | Three phase controllable rectification circuit |
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| CN103166489A (en) * | 2013-04-11 | 2013-06-19 | 安徽工业大学 | Control circuit for three-phase high power factor rectifier |
| CN108702082A (en) * | 2016-03-08 | 2018-10-23 | 西门子股份公司 | The rectifier equipment that can be recovered energy |
| CN108702082B (en) * | 2016-03-08 | 2021-11-19 | 西门子股份公司 | Energy-recovering rectifier device |
| CN108684212A (en) * | 2016-08-30 | 2018-10-19 | 富士电机株式会社 | Surge restraint circuit and Driven by inverter motor system |
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