CN204442168U - A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter - Google Patents

A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter Download PDF

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Publication number
CN204442168U
CN204442168U CN201520139460.2U CN201520139460U CN204442168U CN 204442168 U CN204442168 U CN 204442168U CN 201520139460 U CN201520139460 U CN 201520139460U CN 204442168 U CN204442168 U CN 204442168U
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China
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converter
isolated
diode
phase
former limit
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Expired - Fee Related
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CN201520139460.2U
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Chinese (zh)
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周丽萍
丘东元
张祥
张波
肖文勋
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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 utility model provides a kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter.Converter of the present utility model comprise Y-connection three-phase alternating-current supply, three without bridge CUK isolated converter, output filter capacitor and load, three inputs without bridge CUK isolated converter are connected with the A phase of three-phase alternating-current supply, B phase, C phase voltage respectively separately, and three described is interconnected by interconnect without bridge CUK isolated converter; Three described outputs without bridge CUK isolated converter connect the two ends of output filter capacitor, two terminating load of output filter capacitor.The utility model has buck and exports, realizes the function of power factor correction and constrained input isolation, eliminates phase and phase and to be coupled the circulation caused.The utility model circuit parameter design is simple, is easy to control.

Description

A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter
Technical field
The utility model relates to the power factor correction field of three-phase alternating current, particularly relates to the Three Phase Power Factor Correction Converter of a kind of buck and Isolation input output.
Background technology
The power of switching power converters is greater than 75W and adds power factor correcting converter in access electrical network prime, thus reduces harmonic wave to the pollution of electrical network.In, high-power (more than several kilowatts) application scenario, generally adopt three phase mains power.Adopt traditional three-phase uncontrollable rectifier device rectification that input current can be made to produce distortion, harmonic content increases, and threatens the safe operation of electrical network.The PWM rectifier output voltage of the three-phase BOOST structure of extensive use is up to more than 500V, this voltage stress to successive load requires very high, when requiring low-voltage output, output add the step-down of one-level DC/DC converter after to final load supplying, this adds increased cost and the difficulty of Power Management Design, reduce overall efficiency.The PWM rectification circuit of three-phase BUCK structure can realize step-down, but can not realize boosting, and when requiring High voltage output, output adds DC/DC converter, this adds increased cost and the difficulty of Power Management Design, reduces overall efficiency.No matter be that the PWM rectification circuit of three-phase BOOST structure or the PWM rectification circuit of three-phase BUCK structure all can not realize electrical isolation.Although three-phase BUCK-BOOST PWM rectification circuit can realize buck, can not electrical isolation be realized, the interference of successive load is transferred to input ac power side, increase the difficulty of power factor correction.If be directly connected in parallel on three-phase with traditional three single-stage non-isolation type BOOST, then there is circulation between phase and phase, have influence on the work of non-isolation type BOOST converter.Often isolate by non-isolation type BOOST and rear class the two-stage structure the Three Phase Power Factor Correction Converter be unified into that DC/DC converter forms, although have the function of buck and isolation, but due to needs design two-stage circuit, overall efficiency is low, and every grade of circuit all needs control circuit, this adds increased design cost and difficulty.Also parallel three phase can be realized for traditional CUK and SEPIC isolated converter, but do not control diode rectifier bridge because prime generally adopts, every half power frequency period all has two diode current flows and there is the reverse-recovery problems of rectifier diode, diode uncontrollable rectifier bridge and traditional isolated form CUK and SEPIC converter breaker in middle pipe is adopted to be that hard switching is open-minded, the loss of switching tube is large, and this all reduces the operating efficiency of complete machine.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and provide a kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, concrete technical scheme is as follows.
A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, it comprise the three-phase alternating-current supply of Y-connection, three structures the same without bridge CUK isolated converter, output filter capacitor and load, three described inputs without bridge CUK isolated converter are connected with the A phase of three-phase alternating-current supply, B phase, C phase voltage respectively separately, and three described is interconnected by interconnect without bridge CUK isolated converter; The two ends of three described output termination output filter capacitors without bridge CUK isolated converter, two terminating load of output filter capacitor.
Further, described three structures the same without in bridge CUK isolated converter, eachly comprise input inductance without bridge CUK isolated converter, first former limit diode and the second former limit diode, first switching tube and second switch pipe, former limit electric capacity, high frequency transformer, secondary electric capacity, secondary side diode and secondary inductance composition, wherein input one end of inductance as the input without bridge CUK isolated converter, the anode of another termination first former limit diode of input inductance and the negative electrode of the second former limit diode, the other end of the first former limit diode is connected with one end of the first switching tube source electrode and former limit electric capacity, the drain electrode of the first switching tube is connected with the source electrode of second switch pipe, and in extraction one end, tie point place as interconnected end, is connected with other converter, the other end of former limit electric capacity is connected with the former limit Same Name of Ends of high frequency transformer, the anode of the second former limit diode is connected with the former limit non-same polarity of the drain electrode of second switch pipe and high frequency transformer, the secondary non-same polarity of high frequency transformer is connected with one end of secondary electric capacity, the other end of secondary electric capacity is connected with one end of secondary inductance with the negative electrode of secondary side diode, the other end of secondary inductance as the positive terminal of output, and is connected with load positive terminal with output filter capacitor, the secondary Same Name of Ends of high frequency transformer is connected with the anode of secondary side diode, and this extraction one end, tie point place holding altogether as output.
Further, three have independent controller without each converter in bridge CUK isolated converter or are controlled by same controller simultaneously.
Further, load is pure resistive loads, resistance inductive load, resistance capacitive load or switch converters.
Further, all diodes are general-purpose diode, power diode, thyristor or full-controlled switch pipe.
Further, all switching tubes be MOSFET, switching tube with the one-way conduction of parasitic anti-paralleled diode IGBT or anti-paralleled diode.
Compared with prior art comparatively, the advantage that the utility model has is: realize the power factor close to 1, realizes the buck of input voltage, meets the multiple electric requirement of successive load, the electrical isolation of input ac power side and output loading end.When three converters are all operated under discontinuous mode, the utility model only needs a Voltage loop just can control three isolated converters, can realize power factor correction.This is relative to traditional BOOST PWM rectification circuit, and control method is very simple.Two switching tubes that prime adopts instead of the diode in rectifier bridge, at the positive half cycle of input power, and the upper switching tube S of each converter 1_i(i=1,2,3) realize zero current turning-on, lower switching tube S 2_iit is open-minded that (i=1,2,3) realize no-voltage, and the efficiency of complete machine is higher.What the utility model proposes is a kind of based on the same without three transformer configuration in bridge CUK isolated form Three Phase Power Factor Correction Converter, and parameter is the same, and decreases design difficulty and the cost of complete machine, has very large advantage in industrialization production line balance.
Accompanying drawing explanation
Fig. 1 is a kind of based on the structure chart without bridge CUK isolated form Three Phase Power Factor Correction Converter.
Fig. 2 is the three-phase alternating current oscillogram of a power frequency period.
Three Phase Power Factor Correction Converter fundamental diagram when Fig. 3 is the conducting simultaneously of six switching tubes.
Fig. 4 is that six switching tubes turn off, secondary side diode I d3_ithe fundamental diagram of converter when (i=1,2,3) are all non-vanishing.
Fig. 5 is that six switching tubes turn off, secondary side diode electric current I d3_i(i=1,3) are non-vanishing, I d3_2the fundamental diagram of converter when being zero.
Fig. 6 is that six switching tubes turn off, secondary side diode electric current I d3_3non-vanishing, I d3_ithe fundamental diagram of converter when (i=1,2) are zero.
Fig. 7 is that six switching tubes turn off, secondary side diode I d3_ithe fundamental diagram of converter when (i=1,2,3) are all zero.
Fig. 8 is the input inductive current of the utility model embodiment when being designed to 400V and output voltage waveforms.
Fig. 9 is for amplifying 150 times of waveforms without the voltage and current of two switching tubes up and down of bridge CUK isolated converter (3).
Figure 10 is each input inductive current and corresponding ac phase voltage waveform.
Figure 11 is three-phase alternating current corrugating and three secondary side diode current waveforms of a bit of correspondence intercepting mode 5.
Embodiment
For setting forth content of the present utility model and feature further; below in conjunction with accompanying drawing, specific embodiments of the present utility model is specifically described; but enforcement of the present utility model and protection are not limited thereto; if have below and do not describe part in detail especially, be all that those skilled in the art can adopt existing techniques in realizing.
Basic Topological of the present utility model as shown in Figure 1, there is provided a kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter as embodiment, comprise the three-phase alternating-current supply of Y-connection, three structures the same without bridge CUK isolated converter, output filter capacitor and load.I-th (i=1,2,3) individual without bridge CUK isolated converter by inputting inductance L 1_i, former limit diode D 1_iand D 2_i, switching tube S 1_iand S 2_i, former limit electric capacity C 1_i, high frequency transformer T i, secondary electric capacity C 2_i, secondary side diode D 3_iwith secondary inductance L 2_icomposition.All diodes can be general-purpose diode, power diode and thyristor and full-controlled switch pipe, and all switching tubes can be the switch in parallel diodes of MOSFET and one-way conduction.A phase voltage is by input inductance L 1_1receive former limit diode D 1_1anode and former limit diode D 2_1the node that negative electrode connects, B phase voltage is by input inductance L 1_2receive former limit diode D 1_2anode and former limit diode D 2_2the node that negative electrode connects, C phase voltage is by input inductance L 1_3receive former limit diode D 1_3anode and former limit diode D 2_3the node that negative electrode connects.First without the switching tube S of bridge CUK isolated converter 1 1_1with switching tube S 2_1between node, second without the switching tube S of bridge CUK isolated converter 2 1_2with switching tube S 2_2between node and the 3rd without the switching tube S of bridge CUK isolated converter 3 1_3with switching tube S 2_3between node be interconnected.High frequency transformer T ithe Same Name of Ends of the former limit winding of (i=1,2,3) is connected to former limit electric capacity C 1_i(i=1,2,3), the different name end of vice-side winding is connected to secondary electric capacity C 2_ithe one end of (i=1,2,3).
Former limit electric capacity C 1_iwith secondary electric capacity C 2_i(i=1,2,3) are all polarity free capacitors.Secondary inductance L 2_i(i=1,2,3) one end connects secondary electric capacity C 2_i(i=1,2,3), receive filter capacitor and load after one end interconnects.Filter capacitor C outjumbo electric capacity.Load can be pure resistor load, resistance inductive load, capacitive load and switch converters.In the utility model embodiment each be operated in discontinuous mode state without bridge CUK isolated converter under, adopt a Voltage loop controller to control three without bridge CUK isolated converter.
As shown in annex Fig. 2, according to the amplitude of power frequency period three-phase alternating-current supply A phase, B phase and a C phase voltage be positive and negatively divided into 12 mode, the switch motion of all switching tubes of each mode is consistent.The principle Analysis method of each modal transformation device is similar, analyzes the operation principle of the utility model embodiment below for the 5th mode.As shown in annex Fig. 2, the 5th mode, A phase voltage u a> 0, B phase voltage u b> 0, C phase voltage u cthe magnitude relation of < 0, A phase, B phase and C phase voltage is | u c| > | u a| > | u b|.
Input inductive current I l1_i(i=1,2,3) represent, former limit capacitance voltage V c1_i(i=1,2,3) represent, high frequency transformer original edge voltage V p_i(i=1,2,3), high frequency transformer secondary voltage V s_i(i=1,2,3) represent, secondary capacitance voltage V c2_i(i=1,2,3) represent, secondary inductance electric current I l2_i(i=1,2,3) represent, secondary side diode electric current I d3_i(i=1,2,3) represent.The reference direction of all electric current and voltage variablees is as shown in annex Fig. 1.
Six switching tube conductings simultaneously, the utility model embodiment converter fundamental diagram input voltage as shown in annex Fig. 3 gives input induction charging by switching tube.Former limit electric capacity C 1_i(i=1,2,3) are by switching tube S 1_i(i=1,2,3) and S 2_i(i=1,2,3), then through high frequency transformer T i(i=1,2,3) former limit non-same polarity charges to magnetizing inductance, so high frequency transformer T ithe original edge voltage V of (i=1,2,3) p_i(i=1,2,3) are negative value, sense high frequency transformer T ithe secondary voltage V of (i=1,2,3) s_i(i=1,2,3) are greater than zero, secondary side diode D 3_i(i=1,2,3) bear reverse voltage and end, secondary side diode electric current I d3_i(i=1,2,3) are zero, and secondary electric capacity is by secondary inductance electric current I l2_i(i=1,2,3) powering load.
Six switching tubes close simultaneously has no progeny, secondary side diode electric current I d3_iwhen (i=1,2,3) are all not equal to zero, the utility model embodiment converter fundamental diagram is as shown in annex Fig. 4.On the former limit of high frequency transformer, input inductance L 1_1and L 1_2electric current I l1_i(i=1,2) are by former limit diode D 1_i(i=1,2), former limit electric capacity C 1_i(i=1,2), high frequency transformer T ithe former limit Same Name of Ends of (i=1,2) and switching tube S 2_i(i=1,2) fly-wheel diode order flows into the S of switching tube 1_3fly-wheel diode, former limit electric capacity C 1_3, high frequency transformer T 3former limit Same Name of Ends and former limit diode D 2_3get back to input inductance L 1_3with C phase voltage.Therefore inductive current I is inputted l1_1and I l1_2sum equals I l1_3, input inductance L 1_1and L 1_2owing to bearing positive voltage, so its electric current is I l1_1and I l1_2on the occasion of, namely consistent with reference direction, input inductance L 1_3owing to bearing negative voltage, so its electric current is I l1_3negative value is namely contrary with reference direction.At the secondary of high frequency transformer, the secondary voltage V of high frequency transformer s_i(i=1,2,3) are greater than zero, secondary side diode D 3_i(i=1,2,3) bear forward voltage and end, secondary side diode electric current I d3_i(i=1,2,3) are non-vanishing, but due to the magnitude relation of A phase, B phase and C phase voltage are | u c| > | u a| > | u b|, therefore I d3_2, I d3_1and I d3_3be reduce to zero successively, last three is zero simultaneously.Corresponding operation principle is as shown in annex Fig. 5,6 and 7.I d3_2, I d3_1and I d3_3be after zero, restart the course of work of next switch periods in mode 5.
Implement to carry out simulating, verifying to the utility model below.The power output of each module is 200W, and total power output is 600W.Design parameter is as follows:
Power output: P o=200W*3
Input voltage: 220V/50Hz
Efficiency: η=95%
Power factor: PF=0.99
Total harmonic distortion: THD≤5%
Output voltage: 400V
According to above parameter designing main circuit and control circuit, the utility model embodiment is emulated.Simulation result as annex Fig. 8,9, shown in 10 and 11.Because input inductance is connected with three phase mains respectively, therefore input the input current of inductive current i.e. three phase mains, as shown in annex Fig. 8, input inductive current I l1_1, I l1_2and I l1_3ripple form the change of sinusoidal rule, and in simulation software, measure input inductive current I l1_1, I l1_2and I l1_3total harmonic distortion THD value be respectively 2.947%, 2.950% and 2.947%, all much smaller than domestic standard regulation 10%.Output voltage is surely at 400V.As shown in annex Fig. 9, realize zero current turning-on without the upper switching tube of bridge CUK isolated converter (3), it is open-minded that lower switching tube realizes no-voltage.Current amplifier 150 times in Fig. 9.Annex Figure 10 gives the waveform of each phase voltage and corresponding input inductive current, input inductance L 1_1electric current I l1_1with A phase voltage u a, input inductance L 1_2electric current I l1_2with B phase voltage and input inductance L 1_3electric current I l1_30.999 is with C phase voltage power factor.Annex Figure 11 is two and half switch periods intercepting mode 5 in simulation result, A phase voltage u a> 0, B phase voltage u b> 0, C phase voltage u cthe magnitude relation of < 0, A phase, B phase and C phase voltage is | u c| > | u a| > | u b|, can I be seen from annex Figure 11 d3_2, I d3_1and I d3_3be reduce to zero successively, last three is zero simultaneously.All simulation results all fully demonstrate the utility model under only having a Voltage loop to control, and can realize power factor correction.

Claims (6)

1. based on without a bridge CUK isolated form Three Phase Power Factor Correction Converter, it is characterized in that comprising the three-phase alternating-current supply (4) of Y-connection, three structures the same without bridge CUK isolated converter (1,2 and 3), output filter capacitor (C out) and load (R laod), three described inputs without bridge CUK isolated converter (1,2 and 3) are connected with the A phase of three-phase alternating-current supply (4), B phase, C phase voltage respectively separately, and three described is interconnected by interconnect without bridge CUK isolated converter (1,2 and 3); Three described output termination output filter capacitor (C without bridge CUK isolated converter (1,2 and 3) out) two ends, output filter capacitor (C out) two terminating load (R laod).
2. one according to claim 1 is based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, it is characterized in that three structures the same without in bridge CUK isolated converter, eachly comprise input inductance without bridge CUK isolated converter, first former limit diode and the second former limit diode, first switching tube and second switch pipe, former limit electric capacity, high frequency transformer, secondary electric capacity, secondary side diode and secondary inductance composition, wherein input one end of inductance as the input without bridge CUK isolated converter, the anode of another termination first former limit diode of input inductance and the negative electrode of the second former limit diode, the other end of the first former limit diode is connected with one end of the first switching tube source electrode and former limit electric capacity, the drain electrode of the first switching tube is connected with the source electrode of second switch pipe, and in extraction one end, tie point place as interconnected end, is connected with other converter, the other end of former limit electric capacity is connected with the former limit Same Name of Ends of high frequency transformer, the anode of the second former limit diode is connected with the former limit non-same polarity of the drain electrode of second switch pipe and high frequency transformer, the secondary non-same polarity of high frequency transformer is connected with one end of secondary electric capacity, the other end of secondary electric capacity is connected with one end of secondary inductance with the negative electrode of secondary side diode, the other end of secondary inductance as the positive terminal of output, and with output filter capacitor (C out) and load (R laod) positive terminal is connected, the secondary Same Name of Ends of high frequency transformer is connected with the anode of secondary side diode, and this extraction one end, tie point place holding altogether as output.
3. one according to claim 1 is based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, it is characterized in that three have independent controller without each converter in bridge CUK isolated converter or controlled by same controller simultaneously.
4. one according to claim 1 is based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, it is characterized in that load is pure resistive loads, resistance inductive load, resistance capacitive load or switch converters.
5. one according to claim 2 is based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, it is characterized in that all diodes are general-purpose diode, power diode, thyristor or full-controlled switch pipe.
6. one according to claim 2 is based on without bridge CUK isolated form Three Phase Power Factor Correction Converter, it is characterized in that all switching tubes are MOSFET, switching tube with the one-way conduction of parasitic anti-paralleled diode IGBT or anti-paralleled diode.
CN201520139460.2U 2015-03-12 2015-03-12 A kind of based on without bridge CUK isolated form Three Phase Power Factor Correction Converter Expired - Fee Related CN204442168U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104967304A (en) * 2015-03-12 2015-10-07 华南理工大学 Bridgeless CUK isolation type three-phase power factor correction converter
CN109104092A (en) * 2018-09-28 2018-12-28 南京理工大学 Low switch tube voltage stress current type export resonance converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104967304A (en) * 2015-03-12 2015-10-07 华南理工大学 Bridgeless CUK isolation type three-phase power factor correction converter
CN104967304B (en) * 2015-03-12 2018-04-13 华南理工大学 One kind is based on no bridge CUK isolated form Three Phase Power Factor Correction Converters
CN109104092A (en) * 2018-09-28 2018-12-28 南京理工大学 Low switch tube voltage stress current type export resonance converter
CN109104092B (en) * 2018-09-28 2020-04-14 南京理工大学 Low switch tube voltage stress current type output resonant converter

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