CN105553272A - Straight-through prevention half-bridge LLC resonance converter - Google Patents

Straight-through prevention half-bridge LLC resonance converter Download PDF

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Publication number
CN105553272A
CN105553272A CN201510900119.9A CN201510900119A CN105553272A CN 105553272 A CN105553272 A CN 105553272A CN 201510900119 A CN201510900119 A CN 201510900119A CN 105553272 A CN105553272 A CN 105553272A
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high frequency
frequency transformer
power switch
resonant
former limit
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CN201510900119.9A
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赵清林
范满义
杨秋霞
李晓菊
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Yanshan University
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Yanshan University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/38Means for preventing simultaneous conduction of switches
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

The invention discloses a straight-through prevention half-bridge LLC resonance converter. The converter is composed of an input source Vin, a primary circuit, an LLC resonance network, a transformer and a secondary circuit. The primary circuit is formed by a straight-through prevention half-bridge circuit formed in such a manner that two power switch tubes are serially connected with a diode. The secondary circuit is formed by a rectification circuit. The LLC resonance network and the transformer are formed by a high-frequency transformer, a resonance inductor Lr, an excitation inductor Lm and a resonance capacitor Cr. According to the invention, the LLC resonance structure and the straight-through prevention half-bridge structure are combined, the LLC resonance structure and a straight-through prevention half-bridge arm are integrated, so that the primary side straight-through prevention structure and soft switching of the primary power switch tubes are realized, and the reliability, the power density and the efficiency of the power converter are improved. The straight-through prevention half-bridge LLC resonance converter is applicable to the aerospace and military fields high in reliability, can be applied to the occasions of high input voltages and is simultaneously capable of realizing straight-through prevention, high reliability, high efficiency and high power density.

Description

A kind of anti-straight-through LLC half bridge resonant
Technical field
The present invention relates to the converters field of the systems such as communication power supply, the highly reliable power supply of Aero-Space, hybrid-electric car, particularly relate to a kind of anti-straight-through LLC half bridge resonant.
Background technology
Switching Power Supply is widely used in the every field of national product, and the development of development to highly reliable, high power density, high efficiency, powerful supply convertor of Aero-Space and military industry field is had higher requirement.LLC resonant converter can realize Sofe Switch by it in full-load range, and efficiency is high and be widely used.The present invention adopts LLC resonance to combine with anti-straight-through half-bridge structure, constructs highly reliable, high efficiency converter.
In recent years, due to the development of Aero-Space cause, the research and development of space flight secondary power supply are had higher requirement, traditional push-pull converter due to its switch tube voltage stress high, and be hard switching, transducer effciency is low, can only be applied to the occasion of low input, and bridge converter exists the hidden danger of bridge arm direct pass, be therefore prohibited to apply.
For above structure drawback, for realizing the optimization to circuit, a kind of anti-straight-through LLC half bridge resonant is proposed.The thought adopting anti-straight-through half-bridge structure to combine with LLC resonance structure, realizes the Sofe Switch of switching tube, improves transducer effciency, there is not the hidden danger of bridge arm direct pass in this converter simultaneously, reliability is high, and former limit switch tube voltage stress is low simultaneously, is applicable to the occasion of high input voltage.This converter secondary rectifying tube can realize zero-current switching, effectively improves the efficiency of converter.Converter adopts variable frequency control, realizes the adjustment to output voltage and power.
Summary of the invention
The problem to be solved in the present invention is to provide and is a kind ofly suitable for high input voltage, anti-bridge arm direct pass, highly reliable, anti-straight-through LLC half bridge resonant.
The present invention is achieved through the following technical solutions:
A kind of anti-straight-through LLC half bridge resonant, this converter is by input source V in, former limit circuit, LLC resonant network and transformer and secondary circuit form, described former limit circuit is that the anti-half-bridge structure circuit that leads directly to be made up of two power switch pipes and Diode series is formed, and described secondary circuit is made up of rectification circuit; LLC resonant network and transformer are by high frequency transformer, resonant inductance L r, magnetizing inductance L mwith resonant capacitance C rform;
Described former limit circuit comprises the first power switch tube S 1, the second power switch tube S 2, anti-punch through diode D 1; First power switch tube S 1, anti-punch through diode D 1with the second power switch tube S 2be sequentially connected in series and form anti-straight-through half-bridge structure, then with input voltage source V inbe connected in parallel; Wherein the first power switch tube S 1drain electrode and input voltage source V inpositive pole connect, the first power switch tube S 1source electrode and anti-punch through diode D 1negative electrode connect, the second power switch tube S 2drain electrode and anti-punch through diode D 1anode connect, the second power switch tube S 2source electrode and input voltage source V innegative pole connect;
Described LLC resonant network and transformer comprise the first resonant capacitance C r1, the second resonant capacitance C r2, resonant inductance L rwith high frequency transformer T, the turn ratio of the former limit of high frequency transformer T and secondary is n:1, the first resonant capacitance C r1with the second resonant capacitance C r2be connected in series, then with input voltage source V inbe connected in parallel, the first resonant capacitance C r1with the second resonant capacitance C r2tie point and resonant inductance L rone end connect; High frequency transformer T has two former limit winding N p1, N p2with two vice-side winding N r1, N r2, the first former limit winding N of high frequency transformer T p1same Name of Ends and the first power switch tube S 1source electrode and anti-punch through diode D 1negative electrode connect; The first former limit winding N of high frequency transformer T p1non-same polarity and high frequency transformer T second former limit winding N p2non-same polarity and resonant inductance L rthe other end connect, high frequency transformer T second former limit winding N p2same Name of Ends and the second power switch tube S 2drain electrode and anti-straight-through diode D 1anode connect; The first vice-side winding N of high frequency transformer T s1non-same polarity and the second vice-side winding N of high frequency transformer T s2same Name of Ends connect;
Described secondary circuit comprises the first output rectifier diode pipe D r1, second export rectifier diode D r2, output capacitance C owith load resistance R o, first exports rectifier diode D r1negative electrode and second export rectifier diode D r2negative electrode connect, first exports rectifier diode D r1anode and the first vice-side winding N of high frequency transformer T s1same Name of Ends connect, second exports rectifying tube D r2anode and the second vice-side winding N of high frequency transformer T s2non-same polarity connect; Output capacitance C owith load resistance R oparallel connection, output capacitance C owith load resistance R opositive pole be connected to the first output rectifier diode D r1rectifier diode D is exported with second r2common cathode place, its negative pole is connected to the first vice-side winding N of high frequency transformer T s1non-same polarity and the second vice-side winding N of high frequency transformer T s2same Name of Ends.
The object of the invention is to realize resisting straight-through, highly reliable, high efficiency, high power density isolated DC converter, the present invention adopts LLC resonance structure to combine with anti-straight-through half-bridge structure, by LLC resonance structure and anti-straight-through half-bridge brachium pontis are integrated together, realize the Sofe Switch of the anti-bypass structure in former limit and former limit power switch pipe, improve the reliability of power inverter, power density and efficiency.The present invention only has two switching tubes, can effectively reduce costs.The present invention is applicable to Aero-Space, the military field of highly reliable requirement, can be applied to the occasion of high input voltage, possesses simultaneously and resists straight-through, highly reliable, high efficiency, high power density characteristic converter.
Owing to adopting technique scheme, the anti-straight-through LLC half bridge resonant of one provided by the invention, compared with prior art has such beneficial effect:
(1) there is not the structure of bridge arm direct pass in converter, and eliminate the hidden danger of bridge arm direct pass, reliability is high;
(2) former limit switching tube bears voltage stress is input voltage value, and switch tube voltage stress is low, is applicable to high input voltage occasion;
(3) rectifying tube of all former limit switching tubes and secondary can both realize Sofe Switch, effectively improves transducer effciency, is easy to high frequency design simultaneously.
(4) transformer leakage inductance can be integrated with resonant inductance magnetic, improves the power density of converter.
Accompanying drawing explanation
Fig. 1 is the circuit structure schematic diagram that the present invention resists straight-through LLC half bridge resonant;
Fig. 2 is the key operation waveforms figure that the present invention resists straight-through LLC half bridge resonant;
Fig. 3 is the anti-straight-through LLC half bridge resonant t of the present invention 0-t 1the equivalent circuit diagram in stage;
Fig. 4 is the anti-straight-through LLC half bridge resonant t of the present invention 1-t 2the equivalent circuit diagram in stage;
Fig. 5 is the anti-straight-through LLC half bridge resonant t of the present invention 2-t 3the equivalent circuit diagram in stage;
Fig. 6 is the anti-straight-through LLC half bridge resonant t of the present invention 3after stage, enter the equivalent circuit diagram of negative half period;
Designation in above figure: V infor input voltage source; V gs1, V gs2it is the first power switch tube S 1, the second power switch tube S 2driving; V ds1, V ds2it is the first power switch tube S 1, the second power switch tube S 2both end voltage, i dr1, i dr2for secondary first rectifier diode D r1, the second rectifier diode D r2electric current, i p1, i p2be the first former limit winding N p1with the second former limit winding N p2electric current, S 1be the first power switch pipe, S 2it is the second power switch pipe; C r1be the first resonant capacitance, C r2it is the second resonant capacitance; L rfor resonant inductance; D 1for anti-punch through diode; T is high frequency transformer; N p1, N p2, N s1, N s1be respectively the first former limit winding of high frequency transformer T, the second former limit winding, the first vice-side winding and the second vice-side winding; L m1, L m2be respectively the first winding magnetizing inductance and the second winding magnetizing inductance; i lrfor resonant inductance L relectric current, i p1, i p2be the first former limit winding N p1, the second former limit winding N p2electric current; D r1, D r2be respectively the first output rectifier diode, second and export rectifier diode; C ofor output filter capacitor; R ofor load resistance, D is switching tube duty ratio; t deadit is Dead Time.
Specific embodiments
Below in conjunction with accompanying drawing, the invention will be further described.
The anti-straight-through LLC half bridge resonant of one of the present invention, as shown in Figure 1, this converter is by input source V in, former limit circuit, LLC resonant network and transformer and secondary circuit form, described former limit circuit is that the anti-half-bridge structure circuit that leads directly to be made up of two power switch pipes and Diode series is formed, and described secondary circuit is made up of rectification circuit; LLC resonant network and transformer are by high frequency transformer, resonant inductance L r, magnetizing inductance L mwith resonant capacitance C rform;
Described former limit circuit comprises the first power switch tube S 1, the second power switch tube S 2, anti-punch through diode D 1; First power switch tube S 1, anti-punch through diode D 1with the second power switch tube S 2be sequentially connected in series and form anti-straight-through half-bridge structure, then with input voltage source V inbe connected in parallel; Wherein the first power switch tube S 1drain electrode and input voltage source V inpositive pole connect, the first power switch tube S 1source electrode and anti-punch through diode D 1negative electrode connect, the second power switch tube S 2drain electrode and anti-punch through diode D 1anode connect, the second power switch tube S 2source electrode and input voltage source V innegative pole connect;
Described LLC resonant network and transformer comprise the first resonant capacitance C r1, the second resonant capacitance C r2, resonant inductance L rwith high frequency transformer T, the turn ratio of the former limit of high frequency transformer T and secondary is n:1, the first resonant capacitance C r1with the second resonant capacitance C r2be connected in series, then with input voltage source V inbe connected in parallel, the first resonant capacitance C r1with the second resonant capacitance C r2tie point and resonant inductance L rone end connect; High frequency transformer T has two former limit winding N p1, N p2with two vice-side winding N r1, N r2, the first former limit winding N of high frequency transformer T p1same Name of Ends and the first power switch tube S 1source electrode and anti-punch through diode D 1negative electrode connect; The first former limit winding N of high frequency transformer T p1non-same polarity and high frequency transformer T second former limit winding N p2non-same polarity and resonant inductance L rthe other end connect, high frequency transformer T second former limit winding N p2same Name of Ends and the second power switch tube S 2drain electrode and anti-straight-through diode D 1anode connect; The first vice-side winding N of high frequency transformer T s1non-same polarity and the second vice-side winding N of high frequency transformer T s2same Name of Ends connect;
Described secondary circuit comprises the first output rectifier diode pipe D r1, second export rectifier diode D r2, output capacitance C owith load resistance R o, first exports rectifier diode D r1negative electrode and second export rectifier diode D r2negative electrode connect, first exports rectifier diode D r1anode and the first vice-side winding N of high frequency transformer T s1same Name of Ends connect, second exports rectifying tube D r2anode and the second vice-side winding N of high frequency transformer T s2non-same polarity connect; Output capacitance C owith load resistance R oparallel connection, output capacitance C owith load resistance R opositive pole be connected to the first output rectifier diode D r1rectifier diode D is exported with second r2common cathode place, its negative pole is connected to the first vice-side winding N of high frequency transformer T s1non-same polarity and the second vice-side winding N of high frequency transformer T s2same Name of Ends.
The key operation waveforms figure that the present invention resists straight-through LLC half bridge resonant shown in Fig. 2; Below with Fig. 3---Fig. 6 resists the specific works process of straight-through LLC half bridge resonant to analyze to the present invention:
(t 0-t 1) moment, as shown in Figure 3, former limit first switching tube S 1conducting, secondary first exports rectifier diode D r1be in conducting state, secondary second exports rectifier diode D r2bear reverse voltage and be in cut-off state.Due to anti-punch through diode D 1be in the state of afterflow, therefore two, the former limit of high frequency transformer T winding first former limit winding N always p1with the second former limit winding N p2be equivalent to and be connected in parallel, therefore the voltage at two winding two ends, the former limit of high frequency transformer T is clamped at output voltage V ofeed back to the magnitude of voltage nV on former limit o, former limit first winding magnetizing inductance L m1current i lm1linear rising, the second former limit winding N p2be coupled the first former limit winding N p1voltage, make former limit second winding magnetizing inductance L m2current i lm2linear decline, resonant inductance L rwith the first resonant capacitance C r1with the second resonant capacitance C r2carry out resonance, resonant inductance L rcurrent i lrbe in ascent stage, resonant inductance L rcurrent i lrwith former limit first winding magnetizing inductance L m1current i lm1with former limit second winding magnetizing inductance L m2current i lm2the difference of sum obtains i by inner two winding shunts of high frequency transformer T np1and i np2, i np1and i np2the 1/n of absolute value sum doubly export rectifier diode D for secondary first r1electric current.This stage, input voltage source V inby high frequency transformer T to secondary transmitted power.
(t 1-t 2) moment, as shown in Figure 4, resonant inductance current i lrwith former limit first winding magnetizing inductance L m1current i lm1with former limit second magnetizing inductance L m2current i lm2sum (i lm1+ i lm2) equal, secondary first exports rectifier diode D r1current i dr1reduce to zero, realize zero-current switching, former limit first winding magnetizing inductance L m1with former limit second winding magnetizing inductance L m2participation resonance in parallel, this stage is L m1with L m2shunt inductance and L rseries connection (L m1∥ L m2+ L r) participate in resonance, due to the first winding magnetizing inductance L m1with the second winding magnetizing inductance L m2inductance value be far longer than resonant inductance L rvalue, therefore, this stage harmonic period is much larger than resonant inductance L rwith the first resonant capacitance C r1with the second resonant capacitance C r2harmonic period, this stage current visible is invariable state.Secondary filter capacitor C oenergy is provided to load.
(t 2-t 3) moment, as shown in Figure 5, former limit first switching tube S 1turn off, former limit first winding magnetizing inductance L m1electric current and resonant inductance L relectric current by anti-punch through diode D 1and second power switch tube S 2parasitic diode afterflow, the second power switch tube S 2realize softly opening condition, the first magnetizing inductance L m1, the second magnetizing inductance L m2sum i lm1+ i lm2start to decline, resonant inductance L rcurrent i lrbe greater than the first magnetizing inductance L m1, the second magnetizing inductance L m2sum i lm1+ i lm2, now secondary second exports rectifier diode D r2conducting, high frequency transformer T both end voltage oppositely by clamper, former limit first winding magnetizing inductance L m1electric current linearly declines, former limit second winding magnetizing inductance L m2electric current linearly rises, i lrwith i lm1+ i lm2difference, be delivered to secondary by high frequency transformer T, because i np1with i np2direction is contrary, therefore i np1-i np2equal i lrwith i lm1+ i lm2difference and i np1-i np2=i lr-(i lm1+ i lm2), and i np1-i np2equal secondary rectified current by the transformer coupled current value to former limit, input voltage source V into secondary transmitted power.
T 3after moment, as shown in Figure 6, former limit second switch pipe S 2open-minded, realize no-voltage open-minded, because former limit second switch pipe S 2after opening, its work wave and former limit first switching tube S 1work wave full symmetric when opening, therefore the course of work is not below repeating.
According to the description of the above-mentioned course of work, there is not bridge arm direct pass hidden danger in the present invention, can significantly improve the reliability of converter, reduces switch tube voltage stress, the Sofe Switch of power switch pipe and input rectifying pipe can be realized simultaneously, improve the efficiency of converter.

Claims (1)

1. an anti-straight-through LLC half bridge resonant, is characterized in that: this converter is by input source V in, former limit circuit, LLC resonant network and transformer and secondary circuit form, described former limit circuit is that the anti-half-bridge structure circuit that leads directly to be made up of two power switch pipes and Diode series is formed, and described secondary circuit is made up of rectification circuit; LLC resonant network and transformer are by high frequency transformer, resonant inductance L r, magnetizing inductance L mwith resonant capacitance C rform;
Described former limit circuit comprises the first power switch tube S 1, the second power switch tube S 2, anti-punch through diode D 1; First power switch tube S 1, anti-punch through diode D 1with the second power switch tube S 2be sequentially connected in series and form anti-straight-through half-bridge structure, then with input voltage source V inbe connected in parallel; Wherein the first power switch tube S 1drain electrode and input voltage source V inpositive pole connect, the first power switch tube S 1source electrode and anti-punch through diode D 1negative electrode connect, the second power switch tube S 2drain electrode and anti-punch through diode D 1anode connect, the second power switch tube S 2source electrode and input voltage source V innegative pole connect;
Described LLC resonant network and transformer comprise the first resonant capacitance C r1, the second resonant capacitance C r2, resonant inductance L rwith high frequency transformer T, the turn ratio of the former limit of high frequency transformer T and secondary is n:1, the first resonant capacitance C r1with the second resonant capacitance C r2be connected in series, then with input voltage source V inbe connected in parallel, the first resonant capacitance C r1with the second resonant capacitance C r2tie point and resonant inductance L rone end connect; High frequency transformer T has two former limit winding N p1, N p2with two vice-side winding N r1, N r2, the first former limit winding N of high frequency transformer T p1same Name of Ends and the first power switch tube S 1source electrode and anti-punch through diode D 1negative electrode connect; The first former limit winding N of high frequency transformer T p1non-same polarity and high frequency transformer T second former limit winding N p2non-same polarity and resonant inductance L rthe other end connect, high frequency transformer T second former limit winding N p2same Name of Ends and the second power switch tube S 2drain electrode and anti-straight-through diode D 1anode connect; The first vice-side winding N of high frequency transformer T s1non-same polarity and the second vice-side winding N of high frequency transformer T s2same Name of Ends connect;
Described secondary circuit comprises the first output rectifier diode pipe D r1, second export rectifier diode D r2, output capacitance C owith load resistance R o, first exports rectifier diode D r1negative electrode and second export rectifier diode D r2negative electrode connect, first exports rectifier diode D r1anode and the first vice-side winding N of high frequency transformer T s1same Name of Ends connect, second exports rectifying tube D r2anode and the second vice-side winding N of high frequency transformer T s2non-same polarity connect; Output capacitance C owith load resistance R oparallel connection, output capacitance C owith load resistance R opositive pole be connected to the first output rectifier diode D r1rectifier diode D is exported with second r2common cathode place, its negative pole is connected to the first vice-side winding N of high frequency transformer T s1non-same polarity and the second vice-side winding N of high frequency transformer T s2same Name of Ends.
CN201510900119.9A 2015-12-09 2015-12-09 Straight-through prevention half-bridge LLC resonance converter Pending CN105553272A (en)

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CN109756142A (en) * 2019-01-24 2019-05-14 上海科技大学 Restructural H5 inverter bridge and single-direction and dual-direction controlled resonant converter based on the inverter bridge
CN110995011A (en) * 2019-12-25 2020-04-10 南京工程学院 Bidirectional DC-DC converter based on alternating current switch switching
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CN106655793B (en) * 2017-02-07 2019-04-23 南京航空航天大学 A kind of common resonant inductive type wide input range LLC resonant converter
CN106655793A (en) * 2017-02-07 2017-05-10 南京航空航天大学 Common resonant inductor type wide-input-range LLC resonant converter
CN107196513A (en) * 2017-06-21 2017-09-22 国电南瑞科技股份有限公司 The LLC resonant transform circuits and its method of a kind of suitable wide range output
CN109756142A (en) * 2019-01-24 2019-05-14 上海科技大学 Restructural H5 inverter bridge and single-direction and dual-direction controlled resonant converter based on the inverter bridge
US11482939B2 (en) * 2019-04-08 2022-10-25 Murata Manufacturing Co., Ltd. LLC converter
CN110995011A (en) * 2019-12-25 2020-04-10 南京工程学院 Bidirectional DC-DC converter based on alternating current switch switching
CN111181405A (en) * 2020-01-15 2020-05-19 欣旺达电子股份有限公司 Half-bridge LLC resonant circuit and switching power supply
CN112751489A (en) * 2021-01-18 2021-05-04 天津工业大学 Magnetic integration interleaved LLC resonant converter
CN112751489B (en) * 2021-01-18 2024-03-26 天津工业大学 Magnetic integration staggered parallel LLC resonant converter
CN114301292A (en) * 2021-12-17 2022-04-08 深圳英飞源技术有限公司 Soft switching type bidirectional BUCK-BOOST converter
CN114301292B (en) * 2021-12-17 2023-11-03 深圳英飞源技术有限公司 Soft switching type bidirectional BUCK-BOOST converter
CN117200587A (en) * 2023-11-08 2023-12-08 中山市宝利金电子有限公司 Low-power-loss charging pile circuit based on direct power transmission and charging pile
CN117200587B (en) * 2023-11-08 2024-02-02 中山市宝利金电子有限公司 Low-power-loss charging pile circuit based on direct power transmission and charging pile

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