CN114142735A - High-gain low-ripple soft-switching bidirectional DC-DC converter - Google Patents

High-gain low-ripple soft-switching bidirectional DC-DC converter Download PDF

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Publication number
CN114142735A
CN114142735A CN202111385346.4A CN202111385346A CN114142735A CN 114142735 A CN114142735 A CN 114142735A CN 202111385346 A CN202111385346 A CN 202111385346A CN 114142735 A CN114142735 A CN 114142735A
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circuit
bidirectional
capacitor
transformer
converter
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曾涛
张林渠
刘健豪
康沛
何良宗
李钷
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Xiamen University
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Xiamen University
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion 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
    • H02M3/325—Conversion 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
    • H02M3/335—Conversion 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
    • H02M3/3353—Conversion 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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a high-gain low-ripple soft-switching bidirectional DC-DC converter, wherein the working mode of the bidirectional DC-DC converter is divided into a forward energy transmission mode and a reverse energy transmission mode; the method specifically comprises the following steps: when forward energy is transmitted, the bidirectional DC-DC converter consists of a staggered parallel BOOST circuit, a clamping circuit, a transformer and a forward switched capacitor circuit, wherein the staggered parallel BOOST circuit and the clamping circuit are connected to the primary side of the transformer, and the secondary side of the transformer is connected with the switched capacitor circuit; when reverse energy is transmitted, the bidirectional DC-DC converter consists of a reverse switch capacitor circuit, a transformer, a clamping circuit and a staggered parallel BUCK circuit, wherein the reverse switch capacitor circuit is connected to the primary side of the transformer, and the secondary side of the transformer is connected with the clamping circuit and the staggered parallel BUCK circuit. The bidirectional DC-DC converter provided by the invention has the advantages of high gain, low ripple, low cost, high efficiency and capability of realizing bidirectional energy transmission, and can be used in the occasions of photovoltaic power generation systems and electric vehicles with low output voltage.

Description

High-gain low-ripple soft-switching bidirectional DC-DC converter
Technical Field
The invention relates to the field of bidirectional DC-DC conversion of a switching power supply, in particular to a high-gain low-ripple soft-switching bidirectional DC-DC converter.
Background
With the increasing shortage of energy sources, the utilization of renewable energy sources has become a key research direction in various fields currently, as the most abundant resource in the world, photovoltaic power generation has been listed as a popular development direction of energy source development, a photovoltaic power generation system has an irreplaceable effect in the aspect of energy source utilization, and the photovoltaic power generation system comprises a photovoltaic module, a storage battery, a bidirectional DC-DC converter, a load and other structures. The storage battery serves as an energy storage unit in the photovoltaic power generation system, the stability of the voltage of the direct current bus is guaranteed, energy in the system can be absorbed, and the energy can be transmitted to the direct current bus.
At present, some voltage-fed converters and current-fed converters are two types of converters which are common, but the converters have large input current ripples and reduce the system efficiency, and in addition, a transformer with a high turn ratio increases the voltage stress of components, and the transformer is difficult to design and further reduces the system efficiency.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art, and provides a high-gain low-ripple soft-switching bidirectional DC-DC converter which has the advantages of high gain, low ripple, low cost, high efficiency and capability of realizing energy bidirectional transmission, can be used in the occasions of photovoltaic power generation systems and also in the occasions of electric automobiles with low output voltage.
The invention adopts the following technical scheme:
a high-gain low-ripple soft-switching bidirectional DC-DC converter is characterized in that the working mode of the bidirectional DC-DC converter is divided into a forward energy transmission mode and a reverse energy transmission mode; the method specifically comprises the following steps:
when forward energy is transmitted, the bidirectional DC-DC converter consists of a staggered parallel BOOST circuit, a clamping circuit, a transformer and a forward switched capacitor circuit, wherein the staggered parallel BOOST circuit and the clamping circuit are connected to the primary side of the transformer, and the secondary side of the transformer is connected with the switched capacitor circuit;
when reverse energy is transmitted, the bidirectional DC-DC converter consists of a reverse switch capacitor circuit, a transformer, a clamping circuit and a staggered parallel BUCK circuit, wherein the reverse switch capacitor circuit is connected to the primary side of the transformer, and the secondary side of the transformer is connected with the clamping circuit and the staggered parallel BUCK circuit.
Specifically, the interleaved BOOST circuit comprises a first inductor L1A second inductor L2A first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4The method specifically comprises the following steps:
second inductance L2One end of the first switch tube S is connected with1Source electrode of and second switching tube S2The drain electrode of (1), the first inductor L1One end of the first switch tube is connected with the third switch tube S3Source electrode and fourth switching tube S4The first switch tube S1Drain electrode of (1) and third switching tube S3Is connected with the drain electrode of the second switching tube S2Source electrode and fourth switching tube S4The source electrodes of the two-way transistor are connected; first inductance L1Another end of the second inductor L2And the other end of the two are connected.
Specifically, the clamp circuit is a clamp capacitor Cc.
Specifically, the forward switch capacitor circuit comprises a first resonant capacitor C1aA second resonant capacitor C1bAnd a first output capacitor C2aA second output capacitor C2bThe method specifically comprises the following steps:
the first resonant capacitor C1aAnd a second resonant capacitor C1bA resonant capacitor module formed by series connection, a first output capacitor C2aAnd a second C2bThe output capacitor module is formed by connecting in series; the resonance capacitor module and the output capacitor module are connected in parallel.
Specifically, the reverse switch capacitor circuit comprises a first output capacitor C2aThe first stepTwo output capacitors C2bAnd a third triode Q3And a fourth triode Q4The method specifically comprises the following steps:
a first output capacitor C2aOne end of the first transistor is connected with a third triode Q3The drain electrode of the third triode Q3Is connected with a fourth triode Q4The drain electrode of the fourth triode Q4Is connected with a second output capacitor C2bOne terminal of (1), a second output capacitor C2bThe other end of the first transistor is connected with a third triode Q3A drain electrode of (1); the third triode Q3And a fourth triode Q4Are all switch tubes.
Specifically, the BOOST circuit is staggered and connected in parallel during forward energy transmission, and the BUCK circuit is staggered and connected in parallel during reverse energy transmission.
Specifically, when energy is transmitted in the forward direction, the first switch tube S1And a third switching tube S3Zero voltage on/off is achieved.
Specifically, when the forward energy is transmitted, the secondary side realizes zero current turn-off of the secondary side switching tube through the leakage inductance of the transformer and the resonance of the resonance capacitor.
Specifically, when the forward energy is transmitted, the method for realizing the zero-current turn-off of the switching tube on the secondary side comprises the following steps: the length of the resonance duration is less than the low level time of the driving signal of the switching tube.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
(1) the invention provides a high-gain low-ripple soft-switching bidirectional DC-DC converter, which has working modes of a forward energy transmission mode and a reverse energy transmission mode; when forward energy is transmitted, the bidirectional DC-DC converter consists of a staggered parallel BOOST circuit, a clamping circuit, a transformer and a forward switched capacitor circuit, wherein the staggered parallel BOOST circuit and the clamping circuit are connected to the primary side of the transformer, and the secondary side of the transformer is connected with the switched capacitor circuit; the high-gain low-ripple soft-switching bidirectional DC-DC converter provided by the invention can realize bidirectional flow of energy, and soft switching can be realized in both modes; in addition, two BOOST circuits in the staggered parallel BOOST circuits are opened in a staggered mode, so that input current ripples are greatly reduced; moreover, the symmetrical structural design of the switch capacitor enables ripples of the charging capacitor and the discharging capacitor to be mutually offset, so that the output voltage ripples are reduced; and the voltage spike of the switching tube can be effectively inhibited by utilizing the clamping circuit.
(2) According to the high-gain low-ripple soft-switching bidirectional DC-DC converter provided by the invention, when forward energy is transmitted, the leakage inductance and the resonant capacitor of the transformer resonate to provide conditions for realizing zero current turn-off of a switching tube on the secondary side; and the leakage inductance of the transformer is used as the resonance inductance to participate in the resonance of the secondary side resonance circuit, so that the circuit does not need a buffer circuit adopted for absorbing the leakage inductance of the transformer any more, and the complexity of the circuit is reduced.
(3) The first switching tube and the third switching tube on the primary side in the circuit realize zero voltage switching, and the switching tube on the secondary side in the circuit realizes zero current turn-off, so that the switching loss of the circuit is reduced, and the system efficiency is further improved.
Drawings
Fig. 1 is a main topology diagram of a high-gain low-ripple soft-switching bidirectional DC-DC converter according to an embodiment of the present invention;
FIG. 2 provides a timing diagram for controlling the inverter according to an embodiment of the present invention;
fig. 3 is a resonance equivalent diagram of the secondary side of the transformer according to the embodiment of the present invention.
FIG. 4 illustrates the operation of the reverse energy transfer, Q1-Q4, provided by an embodiment of the present invention.
Fig. 5 is a mode diagram of forward energy transmission according to an embodiment of the present invention, in which fig. 5(a) -fig. 5(j) correspond to the first to tenth mode diagrams, respectively.
Detailed Description
The high-gain low-ripple soft-switching bidirectional DC-DC converter according to the present invention is further described with reference to the accompanying drawings.
Referring to fig. 1, the circuit consists of interleaved BOOST circuits, active clamp circuits, and switched capacitor circuits, where the complementary interleaved parallel circuits minimize input current ripple, the active clamp circuits absorb the voltage spike of the switch, and the symmetrical switched capacitor circuits minimize output voltage ripple.
A high-gain low-ripple soft-switching bidirectional DC-DC converter is characterized in that the working mode of the bidirectional DC-DC converter is divided into a forward energy transmission mode and a reverse energy transmission mode; the method specifically comprises the following steps:
when forward energy is transmitted, the bidirectional DC-DC converter consists of a staggered parallel BOOST circuit, a clamping circuit, a transformer and a forward switched capacitor circuit, wherein the staggered parallel BOOST circuit and the clamping circuit are connected to the primary side of the transformer, and the secondary side of the transformer is connected with the switched capacitor circuit;
when reverse energy is transmitted, the bidirectional DC-DC converter consists of a reverse switch capacitor circuit, a transformer, a clamping circuit and a staggered parallel BUCK circuit, wherein the reverse switch capacitor circuit is connected to the primary side of the transformer, and the secondary side of the transformer is connected with the clamping circuit and the staggered parallel BUCK circuit.
The high-gain low-ripple soft-switching bidirectional DC-DC converter provided by the invention can realize bidirectional flow of energy, and soft switching can be realized in both modes; in addition, two BOOST circuits in the staggered parallel BOOST circuits are opened in a staggered mode, so that input current ripples are greatly reduced; moreover, the symmetrical structural design of the switch capacitor enables ripples of the charging capacitor and the discharging capacitor to be mutually offset, so that the output voltage ripples are reduced; and the voltage spike of the switching tube can be effectively inhibited by utilizing the clamping circuit.
Specifically, the interleaved BOOST circuit comprises a first inductor L1A second inductor L2A first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4The method specifically comprises the following steps:
second inductance L2One end of the first switch tube S is connected with1Source electrode of and second switching tube S2The drain electrode of (1), the first inductor L1One end of the first switch tube is connected with the third switch tube S3Source electrode and fourth switching tube S4The first switch tube S1Drain electrode of (1) and third switching tube S3Is connected with the drain electrode of the second switching tube S2Source electrode and fourth switching tube S4The source electrodes of the two-way transistor are connected; first of allInductor L1Another end of the second inductor L2And the other end of the two are connected.
Specifically, the clamp circuit is a clamp capacitor Cc.
Wherein the first inductor L1A second inductor L connected with the primary side of the transformer2The clamping capacitor is connected with the different name end of the primary side of the transformer, and is connected between the two input ends of the transformer and the negative electrode of the direct-current power supply in parallel.
Specifically, the forward switch capacitor circuit comprises a first resonant capacitor C1aA second resonant capacitor C1bAnd a first output capacitor C2aA second output capacitor C2bThe method specifically comprises the following steps:
the first resonant capacitor C1aAnd a second resonant capacitor C1bA resonant capacitor module formed by series connection, a first output capacitor C2aAnd a second C2bThe output capacitor module is formed by connecting in series; the resonance capacitor module and the output capacitor module are connected in parallel.
Wherein, C1a＝C1b＝C1，C2a＝C2b＝C2。
Specifically, the reverse switch capacitor circuit comprises a first output capacitor C2aA second output capacitor C2bAnd a third triode Q3And a fourth triode Q4The method specifically comprises the following steps:
a first output capacitor C2aOne end of the first transistor is connected with a third triode Q3The drain electrode of the third triode Q3Is connected with a fourth triode Q4The drain electrode of the fourth triode Q4Is connected with a second output capacitor C2bOne terminal of (1), a second output capacitor C2bThe other end of the first transistor is connected with a third triode Q3A drain electrode of (1); the third triode Q3And a fourth triode Q4Are all switch tubes.
When energy is transmitted reversely, the switch capacitor circuit on the primary side only uses half of the switch tubes to realize the reverse flow of the energy.
Specifically, the BOOST circuit is staggered and connected in parallel during forward energy transmission, and the BUCK circuit is staggered and connected in parallel during reverse energy transmission.
Specifically, when energy is transmitted in the forward direction, the first switch tube S1And a third switching tube S3Zero voltage on/off is achieved.
Specifically, when the forward energy is transmitted, the secondary side realizes zero current turn-off of the secondary side switching tube through the leakage inductance of the transformer and the resonance of the resonance capacitor.
Specifically, when the forward energy is transmitted, the method for realizing the zero-current turn-off of the switching tube on the secondary side comprises the following steps: the length of the resonance duration is less than the low level time of the driving signal of the switching tube.
When forward energy is transmitted, the leakage inductance and the resonant capacitor of the transformer resonate to provide conditions for the switching tube on the secondary side to realize zero current turn-off; and the leakage inductance of the transformer is used as the resonance inductance to participate in the resonance of the secondary side resonance circuit, so that the circuit does not need a buffer circuit adopted for absorbing the leakage inductance of the transformer any more, and the complexity of the circuit is reduced.
The first switching tube and the third switching tube on the primary side in the circuit realize zero voltage switching, and the switching tube on the secondary side in the circuit realizes zero current turn-off, so that the switching loss of the circuit is reduced, and the system efficiency is further improved.
The high-gain low-ripple soft-switching bidirectional DC-DC converter provided by the invention adopts a pulse width adjustable control strategy to realize the adjustment of output voltage.
During one switching cycle, according to the volt-second balance of the inductance L1: vin·D+(Vin-VCc) 0 (1-D) can give:
Figure BDA0003366945930000051
wherein D is the duty cycle of the switching tubes S2 and S4.
FIG. 2 is a timing waveform of the converter showing the switching tubes and system control waveforms.
Referring again to fig. 3, the leakage inductance Llk satisfies during a stable duty cycle:
Figure BDA0003366945930000052
to obtain
Figure BDA0003366945930000053
The converter gain is therefore:
Figure BDA0003366945930000061
wherein T0 is the resonance time;
fig. 4(a) -4 (b) show the operation of Q1-Q4 in the reverse energy transfer mode.
Fig. 5(a) -5 (j) are diagrams of the operation modes of the converter during forward energy transmission, and the diagrams totally comprise ten modes.
The reverse energy transmission mode of the high-gain low-ripple soft-switching bidirectional DC-DC converter is similar to the forward energy transmission mode, and modal analysis is not repeated;
when the energy is transmitted reversely, the gain of the converter can be obtained according to the theoretical analysis waveform and volt-second balance principle:
Figure BDA0003366945930000062
and because of Vs＝Vp＝VCCTherefore, it is
Figure BDA0003366945930000063
It is worth noting that: at this time, because the energy is transmitted in the reverse direction, the current input and output are the output and input of the forward energy transmission.
Mode 1[ t ]0-t1]: at t0Time S4And conducting. Inductor L1Current i ofL1Through switch S4Inductance L2Current i ofL2Through switch S2. At this time, due to the switch S2And S4Are all in a conducting state, and the voltage V of the primary side of the transformerpIs zero. The current on both sides of the transformer is zero. Therefore, the inductor current i in this processL1，iL2Linear increase, satisfying:
Figure BDA0003366945930000064
Figure BDA0003366945930000065
Vinis a voltage source.
The secondary side of the transformer is provided with C2a、C2bR, circulation loop, voltage v of output capacitorC2aAnd vC2bRespectively as follows:
Figure BDA0003366945930000066
Figure BDA0003366945930000067
Iois the circuit output current value.
Mode 2[ t ]1-t2]At t1Time of day, S2Off, capacitance Cs1Discharge, Cs2Charging iL2Starting linearly to give Cs1Discharging and supplying Cs2Charging when the capacitor C is chargeds2Charging to VCcAnd Cs1When discharging to 0V, iL2Through switch S1The anti-parallel diode and the secondary side switching tube Q1、Q4Flows through their anti-parallel diodes, so S1、Q1、Q4The voltage across both terminals is zero, providing conditions for their ZVS conduction.
In this state, the input voltage is transferred to the output since the voltage across the primary winding of the transformer is Vp＝-VCcThe secondary winding voltage is:
Vs＝-N·VCc
n is the turns ratio of the transformer, N is N2/N1At this time, leakage inductance L is formed on the secondary sidelk、C1a、Q1And an anti-parallel diode of, and Llk、C1b、C2b、Q4Is connected in parallel with the diodeTwo resonant tanks. VsTo C1aCharging, VsAnd C1bTo C2bAnd (6) charging. The state equation is:
Figure BDA0003366945930000071
Figure BDA0003366945930000072
can be solved to obtain:
vC1a(t)＝N·VCc-[N·VCc-vC1a(t1)]cosω0(t-t1)
vC1b(t)＝N·VCc+[N·VCc-vC1a(t1)]cosω0(t-t1)
Figure BDA0003366945930000073
Imthe peak value of the secondary side current of the transformer meets the following requirements:
Im＝Ioω0Ts
resonant angular frequency omega0And a resonance impedance Z0The following relation is satisfied:
Figure BDA0003366945930000074
in this process, the output capacitor C2aVoltage linearity reduction of (C) and output capacitance of (C)2bThe voltage of (2) is increased to satisfy:
Figure BDA0003366945930000075
mode 3[ t ]2-t3]: at t2Time of day, S1、Q1、Q4Is conducted in ZVS state, and the inductance L1Current i ofL1Continuing to increase linearly, the current iL2 of the inductor L2 decreases linearly as follows:
Figure BDA0003366945930000081
the two resonant tanks continue to resonate.
Mode 4[ t ]3-t4]: at time t3, Q flows1、Q4Becomes 0, and ipAnd drops to 0. In addition, as shown, inductance L1Current i ofL1Push-to-push type medium linear increase, inductance L2Current i ofL2Linearly decreases in the equation. Furthermore S1The anti-parallel diode is turned on again, and the two resonant circuits are turned on at the time t3Stop, switch tube Q1、Q4And is turned off at ZCS.
Mode 5[ t ]4-t5]: at t4Time of day, S1Is in a conducting state, and thus S1Off under ZVS conditions.
Mode 6[ t ]5-t6]: at t5Time of day, S2Turn-on, inductance L1Current i ofL1Through switch S4Inductance L2Current i ofL2Through switch S2. Similar to mode 1, the voltage V at the primary side of the transformerpIs zero. The current on both sides of the transformer is zero. Therefore, the inductor current i in this processL1，iL2Linear increase, satisfying:
Figure BDA0003366945930000082
Figure BDA0003366945930000083
the secondary side of the transformer still has C2a、C2bR, circulation loop, transmissionVoltage v of the output capacitorC2aAnd vC2bRespectively as follows:
Figure BDA0003366945930000084
Figure BDA0003366945930000085
mode 7[ t ]6-t7]: at t6Time of day, S4Off, in addition, iL1Starting linearly to give Cs3Charging and supplying Cs4And (4) discharging. When i isL1Completely supply Cs4Charging to VCcAnd supply Cs3Discharge to 0, flow through S3Antiparallel diode(s), secondary side switching tube Q2、Q3Flows through their anti-parallel diodes, so S3、Q2、Q3The voltage across both terminals is zero, providing conditions for their ZVS conduction.
Like mode 2, in this mode, the input power is transferred to the output terminal, and the input voltage at the primary side of the transformer is Vp＝VCcThe secondary side voltage is:
Vs＝N·VCc
there are two resonant circuits, one of which is composed of C1a，C2a，LlkAnd Q3Of anti-parallel diodes, VsAnd C1aTo C2aCharging, another loop by C1b，LlkAnd Q2Is composed of anti-parallel diodes of VsTo C1bAnd (6) charging. The state equation is:
Figure BDA0003366945930000091
Figure BDA0003366945930000092
can be solved to obtain:
vC1a(t)＝N·VCc+[N·VCc-vC1b(t1)]cosω0(t-t1)
vC1b(t)＝N·VCc-[N·VCc-vC1b(t1)]cosω0(t-t1)
Figure BDA0003366945930000093
mode 8[ t ]7-t8]: at t7Time of day, S3、Q2、Q3Is turned on when its diode is turned on, and thus S3、Q2、Q3Conducting in ZVS state, iL2Is increased according to formula 2, iL1Linearly decreasing as follows:
Figure BDA0003366945930000094
mode 9[ t ]8-t9]: like mode 4, the switching tube Q2、Q3And is turned off in the ZCS state. At the same time, the switch tube S3The anti-parallel diode starts to conduct and outputs current IoThe following were used:
Figure BDA0003366945930000095
mode 10[ t ]9-t10]: at t9At any moment, switch tube S3Off in ZVS state;
the above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims (9)

1. A high-gain low-ripple soft-switching bidirectional DC-DC converter is characterized in that the working mode of the bidirectional DC-DC converter is divided into a forward energy transmission mode and a reverse energy transmission mode; the method specifically comprises the following steps:
when forward energy is transmitted, the bidirectional DC-DC converter consists of a staggered parallel BOOST circuit, a clamping circuit, a transformer and a forward switched capacitor circuit, wherein the staggered parallel BOOST circuit and the clamping circuit are connected to the primary side of the transformer, and the secondary side of the transformer is connected with the switched capacitor circuit;
when reverse energy is transmitted, the bidirectional DC-DC converter consists of a reverse switch capacitor circuit, a transformer, a clamping circuit and a staggered parallel BUCK circuit, wherein the reverse switch capacitor circuit is connected to the primary side of the transformer, and the secondary side of the transformer is connected with the clamping circuit and the staggered parallel BUCK circuit.
2. The high-gain low-ripple soft-switched bidirectional DC-DC converter according to claim 1, wherein the interleaved BOOST circuit comprises a first inductor L1A second inductor L2A first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4The method specifically comprises the following steps:
second inductance L2One end of the first switch tube S is connected with1Source electrode of and second switching tube S2The drain electrode of (1), the first inductor L1One end of the first switch tube is connected with the third switch tube S3Source electrode and fourth switching tube S4The first switch tube S1Drain electrode of (1) and third switching tube S3Is connected with the drain electrode of the second switching tube S2Source electrode and fourth switching tube S4The source electrodes of the two-way transistor are connected; first inductance L1Another end of the second inductor L2And the other end of the two are connected.
3. The high-gain low-ripple soft-switched bidirectional DC-DC converter according to claim 1, wherein the clamping circuit is a clamping capacitor Cc.
4. A high gain low ripple according to claim 1Soft-switched bidirectional DC-DC converter, characterized in that said forward switched capacitor circuit comprises a first resonant capacitor C1aA second resonant capacitor C1bAnd a first output capacitor C2aA second output capacitor C2bThe method specifically comprises the following steps:
the first resonant capacitor C1aAnd a second resonant capacitor C1bA resonant capacitor module formed by series connection, a first output capacitor C2aAnd a second C2bThe output capacitor module is formed by connecting in series; the resonance capacitor module and the output capacitor module are connected in parallel.
5. The high-gain low-ripple soft-switched bidirectional DC-DC converter according to claim 1, wherein the reverse switched capacitor circuit comprises a first output capacitor C2aA second output capacitor C2bAnd a third triode Q3And a fourth triode Q4The method specifically comprises the following steps:
a first output capacitor C2aOne end of the first transistor is connected with a third triode Q3The drain electrode of the third triode Q3Is connected with a fourth triode Q4The drain electrode of the fourth triode Q4Is connected with a second output capacitor C2bOne terminal of (1), a second output capacitor C2bThe other end of the first transistor is connected with a third triode Q3A drain electrode of (1); the third triode Q3And a fourth triode Q4Are all switch tubes.
6. The high-gain low-ripple soft-switched bidirectional DC-DC converter according to claim 1, wherein the BOOST circuits are connected in parallel alternately in forward energy transmission, and the BUCK circuits are connected in parallel alternately in reverse energy transmission.
7. The high-gain low-ripple soft-switching bidirectional DC-DC converter according to claim 3, wherein the first switch tube S is used for forward energy transmission1And a third switching tube S3Zero voltage on/off is achieved.
8. The high-gain low-ripple soft-switching bidirectional DC-DC converter according to claim 5, wherein during forward energy transmission, zero current turn-off of the secondary side switching tube is realized by the leakage inductance of the transformer and the resonance of the resonant capacitor on the secondary side.
9. The high-gain low-ripple soft-switching bidirectional DC-DC converter according to claim 8, wherein during forward energy transmission, the method for realizing zero-current turn-off of the switching tube on the secondary side comprises: the length of the resonance duration is less than the low level time of the driving signal of the switching tube.
CN202111385346.4A 2021-11-22 2021-11-22 High-gain low-ripple soft-switching bidirectional DC-DC converter Pending CN114142735A (en)

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CN101976953A (en) * 2010-09-17 2011-02-16 浙江大学 Isolated bidirectional DC-DC converter realized by coupling inductor
CN103391009A (en) * 2013-07-18 2013-11-13 厦门大学 High-gain isolated type direct current-direct current (DC-DC) convertor
CN106849681A (en) * 2017-04-11 2017-06-13 厦门大学 A kind of high-gain isolated active clamping Sofe Switch DC DC converters
CN107959424A (en) * 2017-12-22 2018-04-24 北京交通大学 The two-way isolated form high-gain DC-DC converter of parallel resonance formula
CN110061627A (en) * 2019-05-15 2019-07-26 华南理工大学 A kind of two-way DC/DC converter of high-gain suitable for energy-storage system
CN110890842A (en) * 2019-10-21 2020-03-17 南京理工大学 Wide-voltage-gain low-current-ripple bidirectional resonant converter and control method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101976953A (en) * 2010-09-17 2011-02-16 浙江大学 Isolated bidirectional DC-DC converter realized by coupling inductor
CN103391009A (en) * 2013-07-18 2013-11-13 厦门大学 High-gain isolated type direct current-direct current (DC-DC) convertor
CN106849681A (en) * 2017-04-11 2017-06-13 厦门大学 A kind of high-gain isolated active clamping Sofe Switch DC DC converters
CN107959424A (en) * 2017-12-22 2018-04-24 北京交通大学 The two-way isolated form high-gain DC-DC converter of parallel resonance formula
CN110061627A (en) * 2019-05-15 2019-07-26 华南理工大学 A kind of two-way DC/DC converter of high-gain suitable for energy-storage system
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