CN105553299A - Rectifying circuit and method for improving neutral point voltage imbalance of a Vienna rectifier - Google Patents
Rectifying circuit and method for improving neutral point voltage imbalance of a Vienna rectifier Download PDFInfo
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- CN105553299A CN105553299A CN201610065254.0A CN201610065254A CN105553299A CN 105553299 A CN105553299 A CN 105553299A CN 201610065254 A CN201610065254 A CN 201610065254A CN 105553299 A CN105553299 A CN 105553299A
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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
- H02M7/2173—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 in a biphase or polyphase circuit arrangement
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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
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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
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Abstract
The invention discloses a rectifying circuit for improving neutral point voltage imbalance of a Vienna rectifier. The rectifying circuit comprises a first LC controllable circuit, a second LC controllable circuit, a sampling circuit, an auxiliary power module, a single-chip microcomputer control module and a driver module, wherein the sampling circuit acquires upper neutral point potential Un1 and lower neutral point potential Un2 output by the Vienna rectifier; the single-chip microcomputer control module outputs a driver signal to the driver module according to the potentials Un1 and Un2; and the driver signal output by the driver module is transmitted to the first LC controllable circuit and the second LC control circuit. The phase shift angles of the first LC controllable circuit and the second LC controllable circuit are changed and then the upper neutral point potential Un1 and the lower neutral point potential Un2 are automatically adjusted through negative feedback to compensate the imbalanced neutral point voltage of the Vienna rectifier until the voltage is balanced. According to the rectification circuit and method, the phase shift angles of the LC controllable circuits are controlled in real time to compensate the imbalanced neutral point voltage, thereby realizing the function of automatically adjusting the neutral point voltage to be balanced.
Description
Technical field
The present invention relates to power electronics and exchange field, particularly one improves the unbalanced rectification circuit of Vienna rectifier mid-point voltage and method.
Background technology
VIENNA rectifier circuit structure is simple, and switching tube quantity is few, can realize three level and run, in equal output voltage situation, effectively can reduce the voltage stress of switching tube.In addition, this circuit has three-level structure, thus, is determining, under current ripples requirement, can adopt less filter inductance.Because These characteristics makes this circuit have applications well prospect in single-phase power factor correcting (PFC) occasion.But the unbalanced problem of the midpoint potential of three-level structure topology exists always, the unbalanced harm of midpoint potential is many-sided, such as, voltage fluctuation on electric capacity can reduce the useful life of electric capacity, and the voltage that the power device of certain the phase brachium pontis caused due to unbalanced voltage bears is bigger than normal etc.The thinking solved also be on a large scale in prevent mid-point potential offset, among a small circle in, reduce the amplitude that mid point fluctuates as far as possible.The shortcomings such as the control of neutral balance is divided into hardware controls and software control generally, and existing hardware control circuit has circuit topology complexity, and control effects is not good.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art and deficiency, one is provided to improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage, adopt a kind of LC controlable electric current, real-time regulation output electric capacity access value, reach the effect of auto-compensation midpoint potential, efficiently solve the unbalanced problem of midpoint potential of Vienna rectification circuit.
Another object of the present invention is to provide one to improve the unbalanced method for rectifying of Vienna rectifier mid-point voltage.
Object of the present invention is realized by following technical scheme:
One improves the unbalanced rectification circuit of Vienna rectifier mid-point voltage, comprises a LC controlable electric current, the 2nd LC controlable electric current, sample circuit, auxiliary power module, single chip control module and driver module, described auxiliary power module is respectively single chip control module, driver module is powered, sample circuit gathers the top midpoint potential Un1 that Vienna rectifier exports, the bottom midpoint potential Un2 that Vienna rectifier exports, and the Un1 that will gather, Un2 transfers to single chip control module, single chip control module exports corresponding drive singal to driver module after calculating, the drive singal that driver module exports transfers to a LC controlable electric current respectively, 2nd LC controlable electric current, the phase shifting angle of the one LC controlable electric current reduces, the phase shifting angle of the 2nd LC controlable electric current increases, or the phase shifting angle of a LC controlable electric current increases, the phase shifting angle of the 2nd LC controlable electric current reduces, Un1 is made by negative feedback, Un2 regulates automatically, compensate the unbalanced mid-point voltage of Vienna rectifier, until balance.
A described LC controlable electric current, comprise the 7th switching tube, 8th switching tube, 7th diode, 8th diode, 11 diode, 12 diode, first electric capacity, first inductance, wherein the 7th diode inverse parallel is on the 7th switching tube, 8th diode inverse parallel is on the 8th switching tube, the drain electrode of the 7th switching tube connects the positive pole of the 11 diode and one end of the first inductance respectively, the top midpoint potential of another termination Vienna rectifier output of the first inductance, the source electrode of the 7th switching tube connects the positive pole of the 12 diode and the negative pole of the first electric capacity respectively, the positive pole of the first electric capacity connects the negative pole of the 11 diode and the drain electrode of the 8th switching tube respectively, the source electrode of the 8th switching tube connects the negative pole of the 12 diode respectively, the midpoint potential that Vienna rectifier exports.
Described 2nd LC controlable electric current, comprise the 9th switching tube, tenth switching tube, 9th diode, tenth diode, 13 diode, 14 diode, second electric capacity, second inductance, wherein the 9th diode inverse parallel is on the 9th switching tube, tenth diode inverse parallel is on the tenth switching tube, the drain electrode of the 9th switching tube connects the positive pole of the 13 diode and one end of the second inductance respectively, the midpoint potential of another termination Vienna rectifier output of the second inductance, the source electrode of the 9th switching tube connects the positive pole of the 14 diode and the negative pole of the second electric capacity respectively, the positive pole of the second electric capacity connects the negative pole of the 13 diode and the drain electrode of the tenth switching tube respectively, the source electrode of the tenth switching tube connects the negative pole of the 14 diode respectively, the bottom midpoint potential that Vienna rectifier exports.
Described Vienna rectifier, it comprises the first rectifier bridge, rectifying bridge arm, described rectifying bridge arm comprises the first switching tube, second switch pipe, 3rd switching tube, 4th switching tube, 5th switching tube, 6th switching tube, first diode, second diode, 3rd diode, 4th diode, 5th diode, 6th diode, first diode inverse parallel is on the first switching tube, second diode inverse parallel is on second switch pipe, 3rd diode inverse parallel is on the 3rd switching tube, 4th diode inverse parallel is on the 4th switching tube, 5th diode inverse parallel is on the 5th switching tube, 6th diode inverse parallel is on the 6th switching tube, the drain electrode of the first switching tube is connected with a phase input of the first rectifier bridge, the source electrode of the first switching tube connects the source electrode of second switch pipe, the midpoint potential that drain electrode and the Vienna rectifier of second switch pipe export is connected, the drain electrode of the 3rd switching tube is connected with the b phase input of the first rectifier bridge, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube, the midpoint potential that drain electrode and the Vienna rectifier of the 4th switching tube export is connected, the drain electrode of the 5th switching tube is connected with the c phase input of the first rectifier bridge, the source electrode of the 5th switching tube connects the source electrode of the 6th switching tube, the midpoint potential that drain electrode and the Vienna rectifier of the 6th switching tube export is connected.
Described auxiliary power module, comprise the second rectifier bridge, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first resistance, the second resistance, for exporting the first voltage stabilizing chip of 15V direct voltage and the second voltage stabilizing chip for exporting 5V direct voltage; Wherein the second upper and lower two ends of rectifier bridge connect the two ends of input power VAC respectively, and two ends are connected with the 5th electric capacity two ends respectively in addition; The input of the positive pole termination first voltage stabilizing chip of the 3rd electric capacity, the input of the output termination second voltage stabilizing chip of the first voltage stabilizing chip, the output of the second voltage stabilizing chip is connected with the input of single chip control module and driver module; The earth terminal of the first voltage stabilizing chip is connected with second resistance one end, the other end ground connection of the second resistance; One end of first resistance is connected with one end of the second resistance, the output of another termination first voltage stabilizing chip; 4th electric capacity connects the input of the second voltage stabilizing chip, other end ground connection; The output of the positive pole termination second voltage stabilizing chip of the 5th electric capacity, other end ground connection.
Described driver module, comprises the drive singal decision circuitry that seven structures are identical, and each drive singal decision circuitry includes the 3rd resistance, the 6th electric capacity, first and door, the first driving isolation circuit; The control signal that single chip control module exports is connected to one end, first and an input of door of the 3rd resistance; Another termination first of 3rd resistance and another input of door and one end of the 6th electric capacity, the other end ground connection of the 6th electric capacity; First connects the first driving isolation circuit with the output of door.
Described driving isolation circuit comprises the identical electronic circuit of seven structures altogether, each electronic circuit all produces the gate pole that a drive singal of isolating delivers to the corresponding switching tube of main circuit, and each electronic circuit includes and comprises the first triode, the second triode, the 7th electric capacity, the first transformer, the 4th resistance; Be connected after the base stage of the first triode is connected with the base stage of the second triode first with the output of door; Be connected with one end of the 7th electric capacity after the emitter of the first triode is connected with the emitter of the second triode, the collector electrode of the first triode connects the output of the first voltage stabilizing chip in auxiliary power module, ground connection after the collector electrode of the second triode is connected with an input of the first transformer, another input of another termination first transformer of the 7th electric capacity; An output of the first transformer is connected with one end of the 4th resistance, the source electrode of the corresponding switching tube of another termination main circuit, the gate pole of the corresponding switching tube of another termination main circuit of the 4th resistance, described main circuit comprises Vienna rectifier, a LC controlable electric current, the 2nd LC controlable electric current.
Another object of the present invention is realized by following technical scheme:
Improve the unbalanced method for rectifying of Vienna rectifier mid-point voltage based on the one improving the unbalanced rectification circuit of Vienna rectifier mid-point voltage, comprise following sequential steps:
S1. single chip control module single chip machine controlling circuit receive main circuit sample the input three-phase electricity obtained phase voltage and input phase current;
S2. the zero crossing moment of input phase voltage and input phase current is calculated respectively, is deducted the zero crossing moment of input phase current the zero crossing moment of input phase voltage, if both differences are just, the moment of opening then reducing Vienna a phase brachium pontis increases Vienna b simultaneously, c phase brachium pontis open the moment, if both differences are negative, the moment of opening then increasing Vienna a phase brachium pontis reduces Vienna b simultaneously, c phase brachium pontis open the moment, make input voltage identical with the zero crossing moment of input current by negative feedback, namely power factor is 1;
S3. the single chip machine controlling circuit of single chip control module receives main circuit and to sample the midpoint potential Un1 and midpoint potential Un2 that obtain, midpoint potential Un2 is deducted with midpoint potential Un1, if gained difference is just, then reduce the phase shifting angle of a LC controlable electric current, increase the phase shifting angle of the 2nd LC controlable electric current simultaneously, if gained difference is negative, then increase the phase shifting angle of a LC controlable electric current, reduce the phase shifting angle of the 2nd LC controlable electric current simultaneously, by negative feedback, midpoint potential is regulated automatically, compensate unbalanced mid-point voltage, realize the balance of midpoint potential.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
The present invention, by changing the structure of output capacitance, makes mid-point voltage automatically continuously to change along with operational environment, solves the unbalanced problem of capacitance voltage.The signal of single chip control module receiver voltage transducer and current sensor, thus the moment of opening shutoff of selector switch pipe, also just have selected the moment of electric capacity place in circuit, thus change the capacitance of place in circuit.When the load, the time that only need change the arrival of drive singal rising edge just by power factor regulation to necessary requirement, can solve the problem of prior art transplantability difference.Add the advantage that the reduction switching tube of three-level structure itself is withstand voltage, this circuit structure can be widely used in powerful application scenario.
Accompanying drawing explanation
Fig. 1 is the structural representation based on improving the unbalanced rectification circuit of Vienna rectifier mid-point voltage of the present invention.
Fig. 2 is the circuit diagram of the auxiliary power module of rectification circuit described in Fig. 1.
Fig. 3 is the circuit diagram of the driver module of rectification circuit described in Fig. 1.
The circuit diagram of the driving isolation circuit that Fig. 4 is driver module described in Fig. 3.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Fig. 1 gives a kind of circuit overall structure chart improving Vienna rectifier mid-point voltage imbalance problem of example of the present invention, comprising main circuit, and auxiliary power module, single chip control module (conventional single-chip microcomputer can be adopted), driver module.Main circuit comprises the first ~ ten switching tube Q1 ~ Q10, first ~ the 20 diode VD1 ~ VD20, the first ~ the second electric capacity C1 ~ C2, first ~ five inductance L 1 ~ L5, load, the first ~ five voltage sensor, first current sensor, the second current sensor.Three-phase alternating-current supply, the three ~ five filter inductance, three-phase uncontrollable rectifier bridge (VD15 ~ VD20), three-phase Vienna brachium pontis, the first and second LC controlable electric currents, load connect in turn, one end of live wire termination the 3rd filter inductance of three-phase electricity, the other end of the three ~ five inductance connects three inputs of the first rectifier bridge respectively, and the input of three-phase Vienna rectifying bridge arm is connected on the output of the first rectifier bridge, first ~ ten diode respectively with the first ~ ten switching tube inverse parallel, the drain electrode of the first switching tube is connected with a phase input of the first rectifier bridge, the source electrode of the first switching tube connects the source electrode of second switch pipe, the drain electrode of second switch pipe is connected with output midpoint potential O, the drain electrode of the 3rd switching tube is connected with the b phase input of the first rectifier bridge, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube, the drain electrode of the 4th switching tube is connected with output midpoint potential O, the drain electrode of the 5th switching tube is connected with the c phase input of the first rectifier bridge, the source electrode of the 5th switching tube connects the source electrode of the 6th switching tube, the drain electrode of the 6th switching tube is connected with output midpoint potential O, one LC controlable electric current comprises the 7th switching tube, 8th switching tube, 7th diode, 8th diode, 11 diode, 12 diode, first electric capacity, first inductance, 7th diode inverse parallel is on the 7th switching tube, 8th diode inverse parallel is on the 8th switching tube, the drain electrode of the 7th switching tube connects the positive pole of the 11 diode and one end of the first inductance respectively, another termination output voltage high potential of first inductance, the source electrode of the 7th switching tube connects the positive pole of the 12 diode and the negative pole of the first electric capacity respectively, the positive pole of the first electric capacity connects the negative pole of the 11 diode and the drain electrode of the 8th switching tube respectively, the source electrode of the 8th switching tube connects the negative pole of the 12 diode respectively and exports midpoint potential O, 2nd LC controlable electric current comprises the 9th switching tube, tenth switching tube, 9th diode, tenth diode, 13 diode, 14 diode, second electric capacity, second inductance, 9th diode inverse parallel is on the 9th switching tube, tenth diode inverse parallel is on the tenth switching tube, the drain electrode of the 9th switching tube connects the positive pole of the 13 diode and one end of the second inductance respectively, another termination of second inductance exports mid point O, the source electrode of the 9th switching tube connects the positive pole of the 14 diode and the negative pole of the second electric capacity respectively, the positive pole of the second electric capacity connects the negative pole of the 13 diode and the drain electrode of the tenth switching tube respectively, the source electrode of the tenth switching tube connects the negative pole of the 14 diode and the electronegative potential of output voltage respectively.The input of the first voltage sensor and a of three-phase electricity are in parallel, the output of the first voltage sensor connects the phase voltage UaN sampling input of single chip control module, the input of the second voltage sensor and the b of three-phase electricity are in parallel, the output of the second voltage sensor connects the phase voltage UbN sampling input of single chip control module, the input of tertiary voltage transducer and the two ends of a LC controlable electric current are in parallel, the output of tertiary voltage transducer connects the midpoint potential Un1 sampling input of single chip control module, the input of the 4th voltage sensor and the two ends of the 2nd LC controlable electric current are in parallel, the output of the 4th voltage sensor connects the midpoint potential Un2 sampling input of single chip control module, input and the load two ends of the 5th voltage sensor are in parallel, the output of the 5th voltage sensor connects the output voltage Udc sampling input of single chip control module, the input of the first current sensor exports series connection with a phase of three-phase electricity, the output of the first current sensor connects the phase current Ia sampling input of single chip control module, the input of the second current sensor exports series connection with the c phase of three-phase electricity, and the output of the second current sensor connects the phase current Ic sampling input of single chip control module.Load is connected in main circuit, the anode that a termination rectification circuit exports, the negative electrode that a termination rectification circuit exports.The alternating voltage of 220V is converted into the direct voltage output of 15V and 5V by auxiliary power module, as the accessory power supply of single chip control module and driver module.Single chip control module output drive signal is to driver module.Driver module by the turn-on instant by adjustment ten switching tubes, thus regulates the time of each electric capacity place in circuit, thus regulates the balance of midpoint potential and the power factor of output.
Fig. 2 gives the circuit diagram of the auxiliary power module improving Vienna rectifier mid-point voltage imbalance problem circuit, and auxiliary power module comprises rectifier bridge Bridge, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the first resistance R1, the second resistance R2.For exporting the first voltage stabilizing chip TL783 of 15V direct voltage and the second voltage stabilizing chip 7805 for exporting 5V direct voltage.The upper and lower two ends of rectifier bridge Bridge connect AC+ and the AC-two ends of input power Vac respectively, and two ends connect with the two ends of the 3rd electric capacity respectively.The Vin1 end of the positive pole termination first voltage stabilizing chip of the 3rd electric capacity, the output end vo ut1 of the first voltage stabilizing chip meets the input Vin2 of the second voltage stabilizing chip, and the output end vo ut2 of the second voltage stabilizing chip is connected with the input Vcc of one-chip computer module and driver module.The earth terminal of the first voltage stabilizing chip connects with second resistance one end, the other end ground connection of the second resistance.One end of first resistance is connected with one end of the second resistance, the output of another termination first voltage stabilizing chip.The positive pole of the 4th electric capacity connects the input of the second voltage stabilizing chip, other end ground connection.The output of the positive pole termination second voltage stabilizing chip of the 5th electric capacity, other end ground connection.The ac voltage rectifier of 220V is become direct voltage by rectifier bridge, the resistance of the first resistance and the second resistance regulates the size of TL783 output voltage, 4th electric capacity is the output filter capacitor of the first voltage stabilizing chip TL783 and the input filter capacitor of the second voltage stabilizing chip 7805,5th electric capacity is the output filter capacitor of the second voltage stabilizing chip, voltage stabilizing chip TL783 and 7805 exports the direct voltage of 15V and 5V respectively, as the power supply of each control circuit of internal system.
Fig. 3 gives the circuit diagram of driver module, and driver module comprises the 3rd resistance R3, the 6th electric capacity C6, first and door U1 and the first driving isolation circuit.The drive singal that single chip control module exports connects one end and first and door of the 3rd resistance respectively.Another termination first of 3rd resistance and one end of door and one end of the 6th electric capacity, the other end ground connection of the 6th electric capacity; First connects the first driving isolation circuit with the output of door.
Fig. 4 gives the circuit diagram of driving isolation circuit in driver module, and driving isolation circuit comprises the first triode VT1, the second triode VT2, the 7th electric capacity C7, the first transformer T1, the 4th resistance R4; Be connected after the base stage of the first triode is connected with the base stage of the second triode first with the output of door; Be connected with one end of the 7th electric capacity after the emitter of the first triode is connected with the emitter of the second triode, the collector electrode of the first triode connects the output of the first voltage stabilizing chip in auxiliary power module, ground connection after the collector electrode of the second triode is connected with an input of the first transformer, another input of another termination first transformer of the 7th electric capacity; An output of the first transformer is connected with one end of the 4th resistance, the source electrode of the switching tube that another termination main circuit drives, the gate pole of another termination main circuit institute driving switch pipe of the 4th resistance.When the high level of drive singal arrives, the first triode ON, due to the effect of the first transformer, drive singal 1 exports high level, the conducting of driving switch pipe; When drive singal is low level, the second triode ON, the first transformer is input as low level, drive singal 1 output low level, and driving switch pipe turns off.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage, it is characterized in that: comprise a LC controlable electric current, the 2nd LC controlable electric current, sample circuit, auxiliary power module, single chip control module and driver module, described auxiliary power module is respectively single chip control module, driver module is powered, sample circuit gathers the top midpoint potential Un1 that Vienna rectifier exports, the bottom midpoint potential Un2 that Vienna rectifier exports, and the Un1 that will gather, Un2 transfers to single chip control module, single chip control module exports corresponding drive singal to driver module after calculating, the drive singal that driver module exports transfers to a LC controlable electric current respectively, 2nd LC controlable electric current, the phase shifting angle of the one LC controlable electric current reduces, the phase shifting angle of the 2nd LC controlable electric current increases, or the phase shifting angle of a LC controlable electric current increases, the phase shifting angle of the 2nd LC controlable electric current reduces, Un1 is made by negative feedback, Un2 regulates automatically, compensate the unbalanced mid-point voltage of Vienna rectifier, until balance.
2. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage according to claim 1, it is characterized in that: a described LC controlable electric current, comprise the 7th switching tube, 8th switching tube, 7th diode, 8th diode, 11 diode, 12 diode, first electric capacity, first inductance, wherein the 7th diode inverse parallel is on the 7th switching tube, 8th diode inverse parallel is on the 8th switching tube, the drain electrode of the 7th switching tube connects the positive pole of the 11 diode and one end of the first inductance respectively, the top midpoint potential of another termination Vienna rectifier output of the first inductance, the source electrode of the 7th switching tube connects the positive pole of the 12 diode and the negative pole of the first electric capacity respectively, the positive pole of the first electric capacity connects the negative pole of the 11 diode and the drain electrode of the 8th switching tube respectively, the source electrode of the 8th switching tube connects the negative pole of the 12 diode respectively, the midpoint potential that Vienna rectifier exports.
3. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage according to claim 1, it is characterized in that: described 2nd LC controlable electric current, comprise the 9th switching tube, tenth switching tube, 9th diode, tenth diode, 13 diode, 14 diode, second electric capacity, second inductance, wherein the 9th diode inverse parallel is on the 9th switching tube, tenth diode inverse parallel is on the tenth switching tube, the drain electrode of the 9th switching tube connects the positive pole of the 13 diode and one end of the second inductance respectively, the midpoint potential of another termination Vienna rectifier output of the second inductance, the source electrode of the 9th switching tube connects the positive pole of the 14 diode and the negative pole of the second electric capacity respectively, the positive pole of the second electric capacity connects the negative pole of the 13 diode and the drain electrode of the tenth switching tube respectively, the source electrode of the tenth switching tube connects the negative pole of the 14 diode respectively, the bottom midpoint potential that Vienna rectifier exports.
4. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage according to claim 1, it is characterized in that: described Vienna rectifier, it comprises the first rectifier bridge, rectifying bridge arm, described rectifying bridge arm comprises the first switching tube, second switch pipe, 3rd switching tube, 4th switching tube, 5th switching tube, 6th switching tube, first diode, second diode, 3rd diode, 4th diode, 5th diode, 6th diode, first diode inverse parallel is on the first switching tube, second diode inverse parallel is on second switch pipe, 3rd diode inverse parallel is on the 3rd switching tube, 4th diode inverse parallel is on the 4th switching tube, 5th diode inverse parallel is on the 5th switching tube, 6th diode inverse parallel is on the 6th switching tube, the drain electrode of the first switching tube is connected with a phase input of the first rectifier bridge, the source electrode of the first switching tube connects the source electrode of second switch pipe, the midpoint potential that drain electrode and the Vienna rectifier of second switch pipe export is connected, the drain electrode of the 3rd switching tube is connected with the b phase input of the first rectifier bridge, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube, the midpoint potential that drain electrode and the Vienna rectifier of the 4th switching tube export is connected, the drain electrode of the 5th switching tube is connected with the c phase input of the first rectifier bridge, the source electrode of the 5th switching tube connects the source electrode of the 6th switching tube, the midpoint potential that drain electrode and the Vienna rectifier of the 6th switching tube export is connected.
5. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage according to claim 1, it is characterized in that: described auxiliary power module, comprise the second rectifier bridge, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first resistance, the second resistance, for exporting the first voltage stabilizing chip of 15V direct voltage and the second voltage stabilizing chip for exporting 5V direct voltage; Wherein the second upper and lower two ends of rectifier bridge connect the two ends of input power VAC respectively, and two ends are connected with the 5th electric capacity two ends respectively in addition; The input of the positive pole termination first voltage stabilizing chip of the 3rd electric capacity, the input of the output termination second voltage stabilizing chip of the first voltage stabilizing chip, the output of the second voltage stabilizing chip is connected with the input of single chip control module and driver module; The earth terminal of the first voltage stabilizing chip is connected with second resistance one end, the other end ground connection of the second resistance; One end of first resistance is connected with one end of the second resistance, the output of another termination first voltage stabilizing chip; 4th electric capacity connects the input of the second voltage stabilizing chip, other end ground connection; The output of the positive pole termination second voltage stabilizing chip of the 5th electric capacity, other end ground connection.
6. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage according to claim 1, it is characterized in that: described driver module, comprise the drive singal decision circuitry that seven structures are identical, each drive singal decision circuitry includes the 3rd resistance, the 6th electric capacity, first and door, the first driving isolation circuit; The control signal that single chip control module exports is connected to one end, first and an input of door of the 3rd resistance; Another termination first of 3rd resistance and another input of door and one end of the 6th electric capacity, the other end ground connection of the 6th electric capacity; First connects the first driving isolation circuit with the output of door.
7. improve the unbalanced rectification circuit of Vienna rectifier mid-point voltage according to claim 6, it is characterized in that: described driving isolation circuit comprises the identical electronic circuit of seven structures altogether, each electronic circuit all produces the gate pole that a drive singal of isolating delivers to the corresponding switching tube of main circuit, and each electronic circuit includes the first triode, the second triode, the 7th electric capacity, the first transformer, the 4th resistance; Be connected after the base stage of the first triode is connected with the base stage of the second triode first with the output of door; Be connected with one end of the 7th electric capacity after the emitter of the first triode is connected with the emitter of the second triode, the collector electrode of the first triode connects the output of the first voltage stabilizing chip in auxiliary power module, ground connection after the collector electrode of the second triode is connected with an input of the first transformer, another input of another termination first transformer of the 7th electric capacity; An output of the first transformer is connected with one end of the 4th resistance, the source electrode of the corresponding switching tube of another termination main circuit, the gate pole of the corresponding switching tube of another termination main circuit of the 4th resistance, described main circuit comprises Vienna rectifier, a LC controlable electric current, the 2nd LC controlable electric current.
8. according to any one of claim 1 to 7, improve the unbalanced method for rectifying of Vienna rectifier mid-point voltage based on the one improving the unbalanced rectification circuit of Vienna rectifier mid-point voltage, it is characterized in that, comprise following sequential steps:
S1. single chip control module single chip machine controlling circuit receive main circuit sample the input three-phase electricity obtained phase voltage and input phase current;
S2. the zero crossing moment of input phase voltage and input phase current is calculated respectively, is deducted the zero crossing moment of input phase current the zero crossing moment of input phase voltage, if both differences are just, the moment of opening then reducing Vienna a phase brachium pontis increases Vienna b simultaneously, c phase brachium pontis open the moment, if both differences are negative, the moment of opening then increasing Vienna a phase brachium pontis reduces Vienna b simultaneously, c phase brachium pontis open the moment, make input voltage identical with the zero crossing moment of input current by negative feedback, namely power factor is 1;
S3. the single chip machine controlling circuit of single chip control module receives main circuit and to sample the midpoint potential Un1 and midpoint potential Un2 that obtain, midpoint potential Un2 is deducted with midpoint potential Un1, if gained difference is just, then reduce the phase shifting angle of a LC controlable electric current, increase the phase shifting angle of the 2nd LC controlable electric current simultaneously, if gained difference is negative, then increase the phase shifting angle of a LC controlable electric current, reduce the phase shifting angle of the 2nd LC controlable electric current simultaneously, by negative feedback, midpoint potential is regulated automatically, compensate unbalanced mid-point voltage, realize the balance of midpoint potential.
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