CN109167514A - A kind of three-phase step-down type PFC rectification circuit - Google Patents
A kind of three-phase step-down type PFC rectification circuit Download PDFInfo
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- CN109167514A CN109167514A CN201811167858.1A CN201811167858A CN109167514A CN 109167514 A CN109167514 A CN 109167514A CN 201811167858 A CN201811167858 A CN 201811167858A CN 109167514 A CN109167514 A CN 109167514A
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Classifications
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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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- 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
- H02M1/4291—Arrangements for improving power factor of AC input by using a Buck converter to switch the input current
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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
A kind of three-phase step-down type PFC rectification circuit, including three-phase voltage source, three-phase uncontrollable rectifier circuit, two symmetrical buck circuits and active triple harmonic current injection circuit；The present invention is compared with three-phase LC filters Passive Power factor correction circuit, and power factor (PF) can reach 1.0, and output voltage is controllable；Compared with three-phase boost-buck type PFC rectification circuit, the present invention can export lower voltage in the case where no booster circuit；Compared with triphase single-switch correcting circuit, current control of the present invention is simple, and inductive current works in continuous mode, and input and output electric current ripple is small, and only needs two inductance, is not required to realize that three-phase decoupling, control are simple；Compared with three-phase Multi- Switch power factor correction circuit, present invention driving and control strategy are simple, and substantially save the cost, is easy to implement, and use scope is wide.
Description
Technical Field
The invention relates to the technical field of power factor correction, in particular to a three-phase buck PFC rectifying circuit.
Background
The Power Factor Correction technology (Power Factor Correction technology) is a basic technology in the Power electronics field and the industrial field, and is used for inhibiting harmonic pollution so as to reduce the harm of higher current harmonics to a Power grid and various electric equipment. With the increase of electric equipment, higher requirements of high efficiency, high power density and high power factor are also put on the electric energy converter, and therefore, various novel PFC conversion topologies are generated. At present, the research on single-phase power factor correction technology is more, and the research on circuit topology and control is quite mature, while the research on three-phase power factor correction is relatively late and less. In recent years, as the research on PFC technology is continuously and deeply carried out, three-phase PFC is increasingly attracting attention.
The power factor correction technology is divided into passive power factor correction and active power factor correction: passive devices such as LC filtering are adopted for passive power factor correction, although the circuit structure is simple and the efficiency is high, the power factor is influenced by inductance value, the maximum power factor can only reach 0.95, and the output voltage is uncontrollable, so that the passive power factor correction is not adopted in most cases; the three-phase active power factor correction topological structure in the prior art has Buck, Boost, Buck-Boost, Flyback, Sepic, Cuk and the like, wherein the Boost and Buck-Boost circuits have a boosting function, so that input current can be still in a continuous state when input voltage changes in a wide range, but output voltage is still high, and a voltage reduction circuit is required to be connected at the rear stage of the three-phase active power factor correction topological structure for voltage reduction regulation on occasions requiring lower rectified output voltage.
From the number of active power transistors used, three-phase PFCs can be divided into two categories: one is a single switch structure and one is a multi-switch structure. In order to realize decoupling between three phases, three inductors are arranged on an alternating current side and work in a current interrupted mode, and the three-phase single-switch Boost PFC circuit is characterized in that current control is simple, but input and output current ripples of the circuit are large, the requirement on filter current is high, and output voltage is too high, so that certain difficulty is brought to selection of a power tube, and the circuit is generally applied to occasions with output power less than 10kw and loose requirement on current THD; although the three-phase multi-switch can control the input current with higher precision and obtain excellent performance, the driving and control strategy is complex, the cost is higher, and the three-phase multi-switch is suitable for occasions with higher power.
Disclosure of Invention
In view of the current state of the power factor correction technology and the existing problems in the background art, the present invention aims to provide an improved three-phase buck PFC rectifier circuit, which has a simple structure and realizes the purpose of power factor correction by injecting third harmonic current, and the present invention is further described below.
A three-phase voltage-reducing PFC rectification circuit comprises a three-phase voltage source, a three-phase uncontrolled rectification circuit, two symmetrical buck circuits and an active third harmonic current injection circuit; wherein,
the three-phase voltage source consists of three sinusoidal voltage sources with the three phases of a, b and c forming an angle of 120 degrees with each other, wherein one ends of the three-phase voltage sources of a, b and c are connected together, and the other ends of the three-phase voltage sources of a, b and c are respectively connected with the three-phase uncontrolled rectifying circuit;
three-phase uncontrolled rectifying circuit, comprising three series circuits connected in parallel, D1And D4Are connected to form a first series circuit, D2And D5Are connected to form a second series circuit, D3And D6The cathodes of the three series circuits are connected with each other to form a third series circuit, the cathodes of the three series circuits are connected with the cathodes to form a common cathode, and the anodes form a common anode;
two symmetrical buck circuits including power switch transistors Q1Diode D7Diode D21Inductor L1Capacitor C1Form a first buck circuit and a power switch tube Q2Diode D8Diode D21Inductor L2Capacitor C1Forming a second buck circuit; q1Is connected with the common cathode of the three-phase uncontrolled rectifying circuit, Q2OfThe emitter is connected with the common anode of the three-phase uncontrolled rectifying circuit;
active third harmonic current injection circuit including a diode D9、D10、D11、D12、D13、D14、D15、D16、D17、 D18、D19、D20And power tube Q3、Q4、Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12、Q13、Q14Wherein the power tube Q3Collector electrode of (2) and (D)9And the first series circuit of the cathode and the anode1And D4Are connected at one point between, Q3Emitter and D9Anode of (D)10And Q4Are connected to the emitter of, Q4Collector electrode of (2) and (D)10And D21The cathodes of the two electrodes are connected; q5Collector electrode of (2) and (D)11And a second series circuit of cathodes and D2And D5Are connected at one point between, Q5Emitter and D11Anode of (D)12And Q6Are connected to the emitter of, Q6Collector electrode of (2) and (D)12And D21Is connected to the cathode of, Q7Collector electrode of (2) and (D)13Is connected to the midpoint of the third series circuit, Q7Emitter and D13Anode of (D)14And Q8Are connected to the emitter of, Q8Collector electrode of (2) and (D)14And D21Is connected to the cathode of, Q9Collector electrode of (2) and (D)15Is connected to the midpoint of the first series circuit, Q9Emitter and D15Anode of (D)16And Q10Are connected to the emitter of, Q10Collector electrode of (2) and (D)16And D21Are connected to the anode of Q11Collector electrode of (2) and (D)17Is connected to the midpoint of the second series circuit, Q11Emitter and D17Anode of (D)18And Q12Emitter phase ofTo Q12Collector electrode of (2) and (D)18And D21Are connected to the anode of Q13Collector electrode of (2) and (D)19Is connected to the midpoint of the third series circuit, Q13Emitter and D19Anode of (D)20And Q14Are connected to the emitter of, Q14Collector electrode of (2) and (D)20And D21Are connected with each other.
Further, the other end of the a-phase voltage source is connected with the D in the first series circuit1And D4One point of the two voltage sources is connected, and the other end of the b-phase voltage source is connected with the middle D of the second series circuit2And D5One point of the other end of the c-phase voltage source is connected with the middle D of the third series circuit3And D6To a point therebetween.
Furthermore, in the first buck circuit, a power switch tube Q1Emitter and D7Are connected to the anode of Q1Collector electrode of (2) and (D)7Is connected to the cathode of, Q1Is connected with the common cathode of the three-phase uncontrolled rectifying circuit, Q1Emitter and D21And L1Are connected at one end, L1Another end of (1) and C1The positive electrodes of the two electrodes are connected; in the second buck circuit, Q2Emitter and D8Are connected to the anode of Q2Collector electrode of (2) and (D)8Is connected to the cathode of, Q2Is connected with the common anode of the three-phase uncontrolled rectifying circuit, Q2Collector electrode of (2) and (D)21And L2Are connected at one end, L2Another end of (1) and C1Are connected with each other.
Further, the power switch tube Q1、Q2、Q3、Q4、Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12、 Q13、Q14MOSFETs or IGBTs are used.
Furthermore, the three-phase input adopts two symmetrical three-phase half-wave rectification circuits, the common cathode to neutral point voltage of the three-phase half-wave rectification circuits is a positive half-cycle envelope line of the three-phase input voltage, and the common anode to neutral point voltage of the three-phase half-cycle envelope line of the three-phase input voltage is a negative half-cycle envelope line of the three-phase input voltage.
Has the advantages that: compared with the prior art, the invention has the following outstanding effects: compared with a three-phase LC filtering passive power factor correction circuit, the power factor of the invention can reach 1.0, and the output voltage is controllable; compared with a three-phase boost-buck PFC rectifying circuit, the invention can output lower voltage under the condition of no booster circuit; compared with a three-phase single-switch correcting circuit, the three-phase single-switch correcting circuit has the advantages that the current control is simple, the inductor current works in a continuous mode, the input and output current ripples are small, only two inductors are needed, three-phase decoupling is not needed, and the control is simple; compared with a three-phase multi-switch power factor correction circuit, the invention has the advantages of simple driving and control strategy, greatly saved cost, convenient realization and wide application range.
Drawings
FIG. 1 is a schematic diagram of the circuit configuration of the present invention;
FIG. 2 is a schematic diagram of the control loop of the present invention;
FIG. 3 is a schematic diagram of the simulation of the a-phase voltage current of the present invention;
FIG. 4 is a schematic of a b-phase voltage current simulation of the present invention;
FIG. 5 is a schematic of a c-phase voltage current simulation of the present invention;
FIG. 6 is four current loops in which the inventive circuit of the present invention operates;
FIG. 7 is four current loops in which the inventive circuit of the present invention operates;
FIG. 8 is four current loops in which the inventive circuit of the present invention operates;
fig. 9 is four current loops in which the inventive circuit of the present invention operates.
Detailed Description
A specific embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, a three-phase buck PFC rectifier circuit includes: the three-phase power supply circuit comprises a three-phase voltage source circuit, a three-phase uncontrolled rectifying circuit, two symmetrical buck circuits and an active third harmonic current injection circuit.
The three-phase voltage source consists of three sinusoidal voltage sources with the three phases of a, b and c forming an angle of 120 degrees with each other, wherein one ends of the three-phase voltage sources of a, b and c are connected together, and the other ends of the three-phase voltage sources of a, b and c are respectively connected with a three-phase uncontrolled rectifying circuit.
Three-phase uncontrolled rectifier circuit comprising a diode D1、D2、D3、D4、D5、D6，D1And D4Are connected to form a first series circuit, D2And D5Are connected to form a second series circuit, D3And D6The cathodes of the three series circuits are connected with each other to form a third series circuit, the cathodes of the three series circuits are connected with the cathodes to form a common cathode, and the anodes of the three series circuits are connected with the anodes to form a common anode, so that a three-phase uncontrolled rectifying circuit is formed; the other end of the a-phase voltage source is connected with the first series circuit D1And D4One point of the two voltage sources is connected, and the other end of the b-phase voltage source is connected with the middle D of the second series circuit2And D5One point of the other end of the c-phase voltage source is connected with the middle D of the third series circuit3And D6To a point therebetween.
Two symmetrical buck circuits including power switch transistors Q1Diode D7Diode D21Inductor L1Capacitor C1Form a first buck circuit and a power switch tube Q2Diode D8Diode D21Inductor L2Capacitor C1Make up ofTwo buck circuits; in the first buck circuit, the power switch tube Q1Emitter and D7Are connected to the anode of Q1Collector electrode of (2) and (D)7Is connected to the cathode of, Q1Is connected with the common cathode of the three-phase uncontrolled rectifying circuit, Q1Emitter and D21And L1Are connected at one end, L1Another end of (1) and C1The positive electrodes of the two electrodes are connected; in the second buck circuit, Q2Emitter and D8Are connected to the anode of Q2Collector electrode of (2) and (D)8Is connected to the cathode of, Q2Is connected with the common anode of the three-phase uncontrolled rectifying circuit, Q2Collector electrode of (2) and (D)21And L2Are connected at one end, L2Another end of (1) and C1Are connected with each other.
Active third harmonic current injection circuit including a diode D9、D10、D11、D12、D13、D14、D15、D16、D17、 D18、D19、D20And power tube Q3、Q4、Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12、Q13、Q14Wherein the power tube Q3Collector electrode of (2) and (D)9And the first series circuit of the cathode and the anode1And D4Are connected at one point between, Q3Emitter and D9Anode of (D)10And Q4Are connected to the emitter of, Q4Collector electrode of (2) and (D)10And D21The cathodes of the two electrodes are connected; q5Collector electrode of (2) and (D)11And a second series circuit of cathodes and D2And D5Are connected at one point between, Q5Emitter and D11Anode of (D)12And Q6Are connected to the emitter of, Q6Collector electrode of (2) and (D)12And D21Is connected to the cathode of, Q7Collector electrode of (2) and (D)13Is connected to the midpoint of the third series circuit, Q7Emitter and D13Anode of (D)14And Q8Are connected to the emitter of, Q8Collector electrode of (2) and (D)14And D21Is connected to the cathode of, Q9Collector electrode of (2) and (D)15Is connected to the midpoint of the first series circuit, Q9Emitter and D15Anode of (D)16And Q10Are connected to the emitter of, Q10Collector electrode of (2) and (D)16And D21Are connected to the anode of Q11Collector electrode of (2) and (D)17Is connected to the midpoint of the second series circuit, Q11Emitter and D17Anode of (D)18And Q12Are connected to the emitter of, Q12Collector electrode of (2) and (D)18And D21Are connected to the anode of Q13Collector electrode of (2) and (D)19Is connected to the midpoint of the third series circuit, Q13Emitter and D19Anode of (D)20And Q14Are connected to the emitter of, Q14Collector electrode of (2) and (D)20And D21Are connected with each other.
In this embodiment, the power switch tube Q1、Q2、Q3、Q4、Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12、Q13、 Q14MOSFETs are used, and in other embodiments, IGBTs may also be used.
The three-phase input adopts two symmetrical three-phase half-wave rectifying circuits, the common cathode to neutral point voltage of the three-phase half-wave rectifying circuits is a positive half-cycle envelope line of the three-phase input voltage, and the common anode to neutral point voltage of the three-phase half-cycle envelope line of the three-phase input voltage is a negative half-cycle envelope line of the three-phase input voltage; the current of the power tubes of the two symmetrical buck circuits is controlled to respectively follow the envelope lines of the positive half cycle and the negative half cycle of the input voltage, the modulation of the active third harmonic current injection circuit is low-frequency modulation of phase change according to the input voltage of the rectifier, and finally the phase of the three-phase current and the phase voltage are kept completely consistent, namely the purpose of power factor correction is achieved, and simulation results show that the PFC function can enable the power factor to reach approximately 1.0.
As shown in FIGS. 3 to 5, FIG. 3 shows a three-phase input a-phase voltage Ua and a current iaFig. 4 shows three-phase input b-phase voltage UbAnd current ibFIG. 5 shows a three-phase input c-phase voltage UcAnd current ic. 3-5, it can be seen that the three-phase current and the three-phase voltage are kept in the same phase, i.e. the purpose of power factor correction is achieved.
FIGS. 6-9 show a typical control mode in which the grid voltage is Ua>Ub>UcAnd four current loops of the circuit work: as shown in FIG. 6, when Q1、Q2When all are conducted, the current is driven from UaFrom the beginning, through D1、Q1、L1、C1、L2、Q2、D6Flow back Uc(ii) a As shown in FIG. 7, when Q1On, Q2At turn-off, current is driven from UaFrom the beginning, through D1、Q1、L1、C1、L2、Q12、D17Flow back Ub(ii) a As shown in FIG. 8, when Q1Off, Q2When conducting, the current is from UbFrom the beginning, through Q5、D12、L1、C1、L2、 Q2、D6Flow back Uc(ii) a As shown in FIG. 9, when Q1、Q2When all are turned off, the current flows through L1、C1、L2And D21And realizing follow current. Similar analysis was done for other voltage cases.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A three-phase voltage-reducing PFC rectification circuit is characterized by comprising a three-phase voltage source, a three-phase uncontrolled rectification circuit, two symmetrical buck circuits and an active third harmonic current injection circuit; wherein,
the three-phase voltage source consists of three sinusoidal voltage sources with the three phases of a, b and c forming an angle of 120 degrees with each other, wherein one ends of the three-phase voltage sources of a, b and c are connected together, and the other ends of the three-phase voltage sources of a, b and c are respectively connected with the three-phase uncontrolled rectifying circuit;
three-phase uncontrolled rectifying circuit, comprising three series circuits connected in parallel, D1And D4Is connected to the cathodeForming a first series circuit, D2And D5Are connected to form a second series circuit, D3And D6The cathodes of the three series circuits are connected with each other to form a third series circuit, the cathodes of the three series circuits are connected with the cathodes to form a common cathode, and the anodes form a common anode;
two symmetrical buck circuits including power switch transistors Q1Diode D7Diode D21Inductor L1Capacitor C1Form a first buck circuit and a power switch tube Q2Diode D8Diode D21Inductor L2Capacitor C1Forming a second buck circuit; q1Is connected with the common cathode of the three-phase uncontrolled rectifying circuit, Q2The emitter of the three-phase uncontrolled rectifying circuit is connected with the common anode of the three-phase uncontrolled rectifying circuit;
active third harmonic current injection circuit including a diode D9、D10、D11、D12、D13、D14、D15、D16、D17、D18、D19、D20And power tube Q3、Q4、Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12、Q13、Q14Wherein the power tube Q3Collector electrode of (2) and (D)9And the first series circuit of the cathode and the anode1And D4Are connected at one point between, Q3Emitter and D9Anode of (D)10And Q4Are connected to the emitter of, Q4Collector electrode of (2) and (D)10And D21The cathodes of the two electrodes are connected; q5Collector electrode of (2) and (D)11And a second series circuit of cathodes and D2And D5Are connected at one point between, Q5Emitter and D11Anode of (D)12And Q6Are connected to the emitter of, Q6Collector electrode of (2) and (D)12And D21Is connected to the cathode of, Q7Collector electrode of (2) and (D)13Cathode and third stringConnected at the midpoint of the circuit, Q7Emitter and D13Anode of (D)14And Q8Are connected to the emitter of, Q8Collector electrode of (2) and (D)14And D21Is connected to the cathode of, Q9Collector electrode of (2) and (D)15Is connected to the midpoint of the first series circuit, Q9Emitter and D15Anode of (D)16And Q10Are connected to the emitter of, Q10Collector electrode of (2) and (D)16And D21Are connected to the anode of Q11Collector electrode of (2) and (D)17Is connected to the midpoint of the second series circuit, Q11Emitter and D17Anode of (D)18And Q12Are connected to the emitter of, Q12Collector electrode of (2) and (D)18And D21Are connected to the anode of Q13Collector electrode of (2) and (D)19Is connected to the midpoint of the third series circuit, Q13Emitter and D19Anode of (D)20And Q14Are connected to the emitter of, Q14Collector electrode of (2) and (D)20And D21Are connected with each other.
2. A three-phase buck PFC rectifier circuit according to claim 1, wherein: the other end of the a-phase voltage source is connected with the D in the first series circuit1And D4One point of the two voltage sources is connected, and the other end of the b-phase voltage source is connected with the middle D of the second series circuit2And D5One point of the other end of the c-phase voltage source is connected with the middle D of the third series circuit3And D6To a point therebetween.
3. A three-phase buck PFC rectifier circuit according to claim 1, wherein: in the first buck circuit, a power switch tube Q1Emitter and D7Are connected to the anode of Q1Collector electrode of (2) and (D)7Is connected to the cathode of, Q1Collector of the three-phase uncontrolled rectifying circuit and a common cathode of the three-phase uncontrolled rectifying circuitAre connected to each other, Q1Emitter and D21And L1Are connected at one end, L1Another end of (1) and C1The positive electrodes of the two electrodes are connected; in the second buck circuit, Q2Emitter and D8Are connected to the anode of Q2Collector electrode of (2) and (D)8Is connected to the cathode of, Q2Is connected with the common anode of the three-phase uncontrolled rectifying circuit, Q2Collector electrode of (2) and (D)21And L2Are connected at one end, L2Another end of (1) and C1Are connected with each other.
4. A three-phase buck PFC rectifier circuit according to claim 1, wherein: the power switch tube Q1、Q2、Q3、Q4、Q5、Q6、Q7、Q8、Q9、Q10、Q11、Q12、Q13、Q14MOSFETs or IGBTs are used.
5. A three-phase buck PFC rectifier circuit according to claim 1, wherein: the three-phase input adopts two symmetrical three-phase half-wave rectification circuits, the common cathode to neutral point voltage of the three-phase input half-cycle envelope curve is the positive half-cycle envelope curve of the three-phase input voltage, and the common anode to neutral point voltage of the three-phase input half-cycle envelope curve is the negative half-cycle envelope curve of the three-phase input voltage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110112902A (en) * | 2019-06-11 | 2019-08-09 | 南昌航空大学 | A kind of three-phase buck-boost type PFC rectification circuit |
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| CN209435106U (en) * | 2018-10-08 | 2019-09-24 | 南昌航空大学 | A kind of three-phase step-down type PFC rectification circuit |
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| CN209435106U (en) * | 2018-10-08 | 2019-09-24 | 南昌航空大学 | A kind of three-phase step-down type PFC rectification circuit |
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| 蔡金琪: "新型三相AC/DC变换器研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》, pages 4 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112902A (en) * | 2019-06-11 | 2019-08-09 | 南昌航空大学 | A kind of three-phase buck-boost type PFC rectification circuit |
| CN110112902B (en) * | 2019-06-11 | 2024-02-09 | 南昌航空大学 | Three-phase boost-buck PFC rectification circuit |
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