CN113938026B - Bidirectional DC-DC conversion circuit - Google Patents
Bidirectional DC-DC conversion circuit Download PDFInfo
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- CN113938026B CN113938026B CN202111545550.8A CN202111545550A CN113938026B CN 113938026 B CN113938026 B CN 113938026B CN 202111545550 A CN202111545550 A CN 202111545550A CN 113938026 B CN113938026 B CN 113938026B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a bidirectional DC-DC conversion circuit, which comprises two transformers, 4 switching tube rectifying circuits and two primary side circuits corresponding to the transformers, wherein each primary side circuit comprises an inverter circuit and an LC resonance circuit; the output end of the inverter circuit is connected with the input end of the LC resonance circuit, and the primary winding of the transformer is connected in series in the LC resonance circuit; the input end of the inverter circuit is connected with the direct current input end, and the secondary side of the transformer comprises 4 secondary side windings; the secondary windings corresponding to the two transformers are connected in parallel and then are connected with the input ends of the corresponding switching tube rectifying circuits, and the output end of the first switching tube rectifying circuit is connected with the output end of the third switching tube rectifying circuit in series and then is connected with the direct current output end; the output end of the second switching tube rectifying circuit is connected with the output end of the first switching tube rectifying circuit in parallel, and the output end of the fourth switching Guan Zhengliu circuit is connected with the output end of the third switching tube rectifying circuit in parallel. The invention can realize automatic voltage equalizing of input and output, has small risk of damage to devices and good reliability of the whole circuit.
Description
Technical Field
The present invention relates to DC conversion, and more particularly, to a bidirectional DC-DC conversion circuit.
Background
In the field of high-power high-voltage direct current-direct current conversion, in order to meet the requirements of small volume, high power, safety and reliability, a topological structure with high power density needs to be isolated. LLC circuits can achieve soft switching of switching devices in the full load range around resonant switching frequencies, achieving less switching losses at high switching frequencies. The high switching frequency can reduce the volume of the magnetic component, thereby realizing high power density. LLC circuits are also increasingly used in the field of power electronics. However, in high-power application occasions, the size of the single magnetic component is increased, which leads to the increase of the size of the whole product and is not beneficial to the overall design of the product. In order to solve the problem, a plurality of groups of discrete magnetic components can be used for grouping and stringing, and a plurality of paths of topologies can be used for grouping and stringing for power sharing output.
The invention with the application number of CN201210212527.1 discloses a serial input serial output full-bridge high-frequency isolation bidirectional DC/DC converter, wherein a main circuit comprises two full-bridge bidirectional DC/DC conversion circuits with the same structure, wherein input ends of the two full-bridge bidirectional DC/DC conversion circuits are connected in series, and output ends of the two full-bridge bidirectional DC/DC conversion circuits are connected in series, each full-bridge bidirectional DC/DC conversion circuit comprises an input side full-bridge circuit and an output side full-bridge circuit, and the input side full-bridge circuit and the output side full-bridge circuit are connected with a high-frequency transformer through a resonant circuit. The full-bridge circuit is used for rectification and inversion, the resonant circuit is used for soft switching control, and the high-frequency transformer is used for isolation and transformation.
The magnetic devices of the multipath components are difficult to be completely consistent, and the power imbalance of the power units of the multipath group and the serial power units can be caused frequently due to the difference of parasitic parameters of other switching devices. The power imbalance can cause excessive heating of an overloaded power unit, so that the risk of damage to devices is brought, and the reliability of the whole circuit is seriously affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bidirectional DC-DC conversion circuit with balanced circuit and good reliability.
In order to solve the technical problem, the technical scheme adopted by the invention is that the bidirectional DC-DC conversion circuit comprises a direct current input end, a direct current output end, two transformers, 4 switching tube rectifying circuits and two primary side circuits corresponding to the transformers, wherein the primary side circuits comprise an inverter circuit and an LC resonance circuit; the output end of the inverter circuit is connected with the input end of the LC resonance circuit, and the primary winding of the transformer is connected in series in the LC resonance circuit corresponding to the primary circuit; the input end of the inverter circuit is connected with the direct current input end, and the secondary side of the transformer comprises 4 secondary side windings; the secondary windings corresponding to the two transformers are connected in parallel and then are connected with the input ends of the corresponding switching tube rectifying circuits, and the output end of the first switching tube rectifying circuit is connected with the output end of the third switching tube rectifying circuit in series and then is connected with the direct current output end; the output end of the second switching tube rectifying circuit is connected with the output end of the first switching tube rectifying circuit in parallel, and the output end of the fourth switching Guan Zhengliu circuit is connected with the output end of the third switching tube rectifying circuit in parallel; the inverter circuit is a rectifying circuit in the reverse direction, and the switching tube rectifying circuit is a third inverter circuit in the reverse direction.
The bidirectional DC-DC conversion circuit is characterized in that a first secondary winding of a first transformer and a first secondary winding of a second transformer are connected in parallel and then are connected with an input end of a first switching tube rectifying circuit, a second secondary winding of the first transformer and a second secondary winding of the second transformer are connected in parallel and then are connected with an input end of a third switching tube rectifying circuit, a third secondary winding of the first transformer and a third secondary winding of the second transformer are connected in parallel and then are connected with an input end of a second switching tube rectifying circuit, and a fourth secondary winding of the first transformer and a second secondary winding of the fourth transformer are connected in parallel and then are connected with an input end of a fourth switching Guan Zhengliu circuit.
The bidirectional DC-DC conversion circuit comprises a transformer, a first transformer and a second transformer, wherein the transformer comprises a first primary winding and a second primary winding, and the first primary winding is connected with the second primary winding in series; the first secondary winding and the second secondary winding of the transformer are coupled to the first primary winding, and the third secondary winding and the fourth secondary winding of the transformer are coupled to the second primary winding.
The bidirectional DC-DC conversion circuit is characterized in that the transformer comprises a first sub-transformer and a second sub-transformer, wherein the first sub-transformer comprises a first primary winding, a first secondary winding and a second secondary winding, and the second sub-transformer comprises a second primary winding, a third secondary winding and a fourth secondary winding.
The bidirectional DC-DC conversion circuit is characterized in that the inverter circuit is a full-bridge inverter circuit.
The bidirectional DC-DC conversion circuit comprises two input capacitors and two output capacitors, wherein the input ends of the two inverter circuits are connected in series and then are connected with a direct current input end, the first input capacitor is connected between the positive electrode and the negative electrode of the input end of the first inverter circuit, and the second input capacitor is connected between the positive electrode and the negative electrode of the input end of the second inverter circuit; the first output capacitor is connected with the output end of the first switching tube rectifying circuit in parallel, and the second output capacitor is connected with the output end of the third switching tube rectifying circuit in parallel.
The bidirectional DC-DC conversion circuit is characterized in that the switching tube rectifying circuit is a switching tube full-bridge rectifying circuit.
The bidirectional DC-DC conversion circuit comprises three output switches, wherein the negative electrode of the output end of the first switching tube rectifying circuit is connected with the positive electrode of the output end of the third switching tube rectifying circuit through the first output switch; the positive electrode of the output end of the first switching tube rectifying circuit is connected with the positive electrode of the output end of the third switching tube rectifying circuit through the second output switch, and the negative electrode of the output end of the first switching tube rectifying circuit is connected with the negative electrode of the output end of the third switching tube rectifying circuit through the third output switch.
The bidirectional DC-DC conversion circuit comprises the following two working modes when working in the forward direction: when the first output switch is closed, the second output switch and the third output switch are opened, and the low-voltage output is realized; when the first output switch is opened, the second output switch and the third output switch are closed, and the high voltage is output.
The bidirectional DC-DC conversion circuit comprises the following two working modes when working reversely: when the reverse input voltage VB is higher, the first output switch is closed, and the second output switch and the third output switch are opened; when the reverse input voltage is low, the first output switch is open, and the second and third output switches are closed.
The invention can realize automatic voltage equalizing of input and output, has small risk of damage to devices and good reliability of the whole circuit.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a circuit diagram of a bidirectional DC-DC conversion circuit according to an embodiment of the present invention.
Detailed Description
In order to adapt to the voltage range of high-power wide input and wide output, the invention provides a bidirectional DC-DC conversion circuit capable of automatically equalizing voltage. In the following embodiment, the D-DC conversion circuit adopts a full-bridge LLC topology, a plurality of groups of transformers and groups of strings of topological units can be adopted by soft switches and converters, high power density can be realized, and voltage equalizing of forward and reverse automatic input and output can be realized by the circuit.
The structure of the bidirectional DC-DC conversion circuit according to the embodiment of the present invention is shown in FIG. 1. The high-voltage direct-current power supply comprises a high-voltage direct-current input end VA, a direct-current output end VB, two high-frequency transformers, 4 switching tube full-bridge rectifying circuits and primary side circuits corresponding to the two high-frequency transformers.
The primary side circuit comprises a full-bridge inverter circuit and an LC resonance circuit, the output end of the full-bridge inverter circuit is connected with the input end of the LC resonance circuit, and the primary side winding of the high-frequency transformer is connected in series in the LC resonance circuit corresponding to the primary side circuit.
Each high-frequency transformer is composed of two sub-transformers, the first high-frequency transformer includes a high-frequency transformer T1 and a high-frequency transformer T2, and the second high-frequency transformer includes a high-frequency transformer T3 and a high-frequency transformer T4.
The input capacitor C1 and the input capacitor C2 are connected in series and then connected between the positive and negative electrodes of the high-voltage direct-current input terminal VA. The voltages on the input capacitance C1 and the input capacitance C2 are V1 and V2, respectively.
The full-bridge inverter circuit of the first primary circuit is composed of power switching tubes Q1, Q2, Q3 and Q4, the input end of the full-bridge inverter circuit of the first primary circuit is connected with an input voltage V1, and the output end of the full-bridge inverter circuit is connected with a resonant inductor Lr1, a resonant capacitor Cr1, a primary winding n1_1 of a sub-transformer T1 and a primary winding n2_1 of a sub-transformer T2 in series. The full-bridge inverter circuit of the second primary circuit is composed of power switching tubes Q5, Q6, Q7 and Q8, the input end of the full-bridge inverter circuit of the second primary circuit is connected with input voltage V2, and the output end of the full-bridge inverter circuit of the second primary circuit is connected with resonant inductor Lr2, resonant capacitor Cr2, primary winding n3_1 of a sub-transformer T3 and primary winding n4_1 of a sub-transformer T4 in series.
In this embodiment, the driving of the switching transistors Q1, Q2, Q3, Q4 and Q5, Q6, Q7, Q8 of the two full-bridge inverter circuits are in one-to-one correspondence and completely identical. The sub-transformer T1 has two secondary windings n1_2 and n1_3, and the turn ratio relationship is n1_1: n1_2: n1_3=1:1:1; the sub-transformer T2 has two secondary windings n2_2 and n2_3, and the relation of the original turn ratio is n2_1: n2_2: n2_3=1:1:1; the sub-transformer T3 has two secondary windings n3_2 and n3_3, and the turn ratio relationship is n3_1: n3_2: n3_3=1:1:1; the sub-transformer T4 has two secondary windings n4_2 and n4_3, and the turn ratio relationship is n4_1: n4_2: n4_3=1:1:1. And the primary winding turns of the sub-transformer T1, the sub-transformer T2, the sub-transformer T3 and the sub-transformer T4 are the same, i.e. n1_1=n2_1=n3_1=n4_1.
Each switching tube full-bridge rectifying circuit consists of 4 switching tubes, so that synchronous rectification is realized; the first switching tube full-bridge rectifier circuit is composed of switching tubes Q9, Q10, Q11 and Q12, the second switching tube full-bridge rectifier circuit is composed of switching tubes Q13, Q14, Q15 and Q16, the third switching tube full-bridge rectifier circuit is composed of switching tubes Q17, Q18, Q19 and Q20, and the fourth switching tube full-bridge rectifier circuit is composed of switching tubes Q21, Q22, Q23 and Q24.
The first secondary winding n1_2 of the sub-transformer T1 is connected with the first secondary winding n3_2 of the sub-transformer T3 in parallel and then is connected with the input end of the first switching tube full-bridge rectifying circuit, the second secondary winding n1_3 of the sub-transformer T1 is connected with the first secondary winding n3_3 of the sub-transformer T3 in parallel and then is connected with the input end of the third switching tube full-bridge rectifying circuit, the first secondary winding n2_2 of the sub-transformer T2 is connected with the first secondary winding n4_2 of the sub-transformer T4 in parallel and then is connected with the input end of the second switching tube full-bridge rectifying circuit, and the second secondary winding n2_3 of the sub-transformer T2 is connected with the second secondary winding n4_3 of the sub-transformer T4 in parallel and then is connected with the input end of the fourth switching tube full-bridge rectifying circuit.
The output end of the first switching tube full-bridge rectifying circuit is connected with the output end of the second switching tube full-bridge rectifying circuit in parallel, and is connected with an output capacitor C3, and the output end of the third switching tube full-bridge rectifying circuit is connected with the output end of the fourth switching tube full-bridge rectifying circuit in parallel, and is connected with an output capacitor C4.
From the winding turns and the parallel relationship, the winding voltage magnitudes on the secondary side can be found to be v1_2=vn1_3=vn2_2=vn2_3=vn3_2=vn3_3=vn4_2=vn4_3. Corresponding to the turn ratio relation, the primary winding voltage amplitudes of the sub-transformers T1, T2, T3 and T4 are also equal. Because the driving of the switching tubes of the two full-bridge inverter circuits is completely consistent, the voltage duration of primary windings of the sub-transformers T1, T2, T3 and T4 is also consistent, and the automatic voltage regulation and equalizing of the voltages V1 and V2 corresponding to the input capacitors can be realized.
The positive electrode of the output capacitor C3 is connected with the positive electrode of the direct-current output end VB; the negative electrode of the output capacitor C4 is connected with the negative electrode of the direct current output end VB. The output end of the first switching tube full-bridge rectifying circuit is connected in series with the output end of the third switching tube full-bridge rectifying circuit and then is connected between the positive electrode and the negative electrode of the direct current output end VB of the bidirectional DC-DC conversion circuit. The negative electrode of the output end of the first switching tube full-bridge rectifying circuit is connected with the positive electrode of the output end of the third switching tube full-bridge rectifying circuit through a first output switch K1. The positive electrode of the output end of the first switching tube rectifying circuit is connected with the positive electrode of the output end of the third switching tube rectifying circuit through a second output switch K2, and the negative electrode of the output end of the first switching tube rectifying circuit is connected with the negative electrode of the output end of the third switching tube rectifying circuit through a third output switch K3.
When the switch K1 is closed and the switches K2 and K3 are opened, the total output VB of the conversion circuit is the sum of the series connection of the V3 and the V4, and VB=V3+V4; when switch K1 is open and switches K2 and K3 are closed, the total output VB of the conversion circuit is the parallel value of V3 and V4, vb=v3=v4. The output of a wide voltage range can be realized by switching the two modes of the output switch K1, the switch K2 and the switch K3.
When the bidirectional DC-DC conversion circuit of the embodiment of the invention works reversely, VB is an input side, and VA is an output side. The 4 switching tube full-bridge rectifier circuits are used for primary side driving modulation and work in a mode of reverse full-bridge inverter circuits, and driving waveforms of the 4 switching tubes of each reverse full-bridge inverter circuit are completely consistent in one-to-one correspondence, for example, driving waveforms of Q9, Q13, Q17 and Q21 are completely consistent. Since the reverse input ends of the first switching tube full-bridge rectifier circuit and the second switching tube full-bridge rectifier circuit are connected in parallel, and the reverse input ends of the third switching tube full-bridge rectifier circuit and the fourth switching tube full-bridge rectifier circuit are connected in parallel, the reverse primary windings (secondary windings) of the 4 sub-transformers are connected in parallel one by one, and vn1_2=v3_2=vn2_2=vn4_2, v1_3=vn3_3=vn2_3=vn4_3.
When the reverse input voltage VB is lower, the switch K1 is opened, the switch K2 and the switch K3 are closed, the input ends of the 4 reverse full-bridge inverter circuits are connected in parallel, the voltage amplitudes of all reverse primary windings of the 4 sub-transformers are equal, the voltage amplitudes of all windings of reverse secondary sides (primary windings) of the sub-transformers are equal due to the turn ratio relation, the output voltages of the two reverse full-bridge synchronous rectifier circuits (full-bridge inverter circuits) of the primary circuits are equal, and automatic voltage equalizing and midpoint voltage balancing of the output V1 and the output V2 can be realized.
When the reverse input voltage VB is high, the switch K1 is closed, the switches K2, K3 are open, and thus the input voltages V3 and V4 are connected in series. Because the full-bridge driving of the 4 switching tube full-bridge rectification circuits (reverse full-bridge inverter circuits) is completely consistent, and the turn ratio relationship of the transformers can clamp the voltage amplitude of the two primary side windings (reverse secondary side windings) of each sub-transformer to be consistent, v1_2=v3_2=v2_2=v4_2, v1_3=v3_3=v2_3=vn4_3, v1_2=v3_2=v2_2=vn4_2=v1_3=vn3=v2_3=vn3=v4_3=v3_3 and thus the voltage V3 and the voltage V4 can be automatically equalized. The voltage amplitude of the primary winding (reverse secondary winding) of the transformer is equal, and the output voltages V1 and V2 realize automatic voltage equalizing.
When the embodiment of the invention works in the forward direction, the primary side circuits of the transformers are connected in series, the secondary side windings are connected in parallel, and the secondary side windings of each transformer are equal in voltage amplitude after being output by the full-bridge rectifying circuit. Corresponding to the equal voltage amplitude of the primary winding of each transformer, the input voltage of the two full-bridge inverter circuits can be equal, the voltage equalizing and the midpoint voltage equalizing can be realized, and the output voltage equalizing of the 4 full-bridge rectifier circuits under the output serial-parallel connection mode can be realized. And a wider voltage output range is realized through switching of the output switch.
When the embodiment of the invention works reversely, through the parallel connection of the reverse primary sides of the transformers, the parallel connection of the input of the reverse inverter circuits and the serial connection of the reverse secondary side windings, the serial connection after the output of the reverse rectifier circuits, the voltage amplitude of the reverse primary side windings of each transformer is equal, the voltage amplitude of the reverse secondary side windings is equal, the input voltages of 4 inverter circuits are equal, the voltage equalizing is realized, the output voltage equalizing and the midpoint voltage equalizing of the two reverse rectifier circuits are realized, and the wider voltage input range is realized through the switching of the input switches.
According to the embodiment of the invention, the requirement of high-voltage input is realized by serially connecting the input of the positive two full-bridge LLC circuits, and the voltage stress of each switching tube is halved. The primary side circuits of the sub-transformers are connected in series, the secondary side circuits are connected in parallel in a staggered manner, the power of each transformer unit is shared, and the voltage output by each full-bridge rectifying circuit of the secondary side circuits is equal to the automatic voltage equalizing of the input series voltage of the primary side circuits. When the transformer works in the reverse direction, the primary windings of the transformer are connected in parallel, and the secondary windings are connected in series, so that the voltage equalizing of input and output and the voltage equalizing of each transformer winding can be realized.
Claims (10)
1. The bidirectional DC-DC conversion circuit comprises a direct current input end, a direct current output end, two transformers and two primary side circuits corresponding to the transformers, wherein each primary side circuit comprises an inverter circuit and an LC resonance circuit; the output end of the inverter circuit is connected with the input end of the LC resonance circuit, and the primary winding of the transformer is connected in series in the LC resonance circuit corresponding to the primary circuit; the input end of the inverter circuit is connected with the direct current input end, and the inverter circuit is characterized by comprising 4 switching tube rectifying circuits, wherein the secondary side of each transformer comprises 4 secondary side windings; the secondary windings corresponding to the two transformers are connected in parallel and then are connected with the input ends of the corresponding switching tube rectifying circuits, and the output end of the first switching tube rectifying circuit is connected with the output end of the third switching tube rectifying circuit in series and then is connected with the direct current output end; the output end of the second switching tube rectifying circuit is connected with the output end of the first switching tube rectifying circuit in parallel, and the output end of the fourth switching Guan Zhengliu circuit is connected with the output end of the third switching tube rectifying circuit in parallel; the inverter circuit is reversely a rectifying circuit, and the switching tube rectifying circuit is reversely a third inverter circuit; when the bidirectional DC-DC conversion circuit works reversely, the direct current output end is an input side, and the direct current input end is an output side; the 4 switching tube rectifying circuits are used for primary side driving modulation and work in a reverse full-bridge inverter circuit mode, and driving waveforms of the 4 switching tube rectifying circuits of each reverse full-bridge inverter circuit are completely consistent in one-to-one correspondence;
when the bidirectional DC-DC conversion circuit works in the forward direction, the primary side circuit of the transformer is connected in series, the secondary side windings are connected in parallel, and the output of the full-bridge rectification circuit is connected in parallel; when the transformer works reversely, the reverse primary side circuits of the transformers are connected in parallel, the inputs of the reverse inverter circuits are connected in parallel, the reverse secondary side windings are connected in series, and the outputs of the reverse rectifier circuits are connected in series.
2. The bidirectional DC-DC conversion circuit of claim 1, wherein a first secondary winding of the first transformer and a first secondary winding of the second transformer are connected in parallel and then connected to an input terminal of the first switching tube rectifying circuit, a second secondary winding of the first transformer and a second secondary winding of the second transformer are connected in parallel and then connected to an input terminal of the third switching tube rectifying circuit, a third secondary winding of the first transformer and a third secondary winding of the second transformer are connected in parallel and then connected to an input terminal of the second switching tube rectifying circuit, and a fourth secondary winding of the first transformer and a second secondary winding of the fourth transformer are connected in parallel and then connected to an input terminal of the fourth switching Guan Zhengliu circuit.
3. The bi-directional DC-DC conversion circuit of claim 1 wherein the primary winding of the transformer comprises a first primary winding and a second primary winding, the first primary winding being in series with the second primary winding; the first secondary winding and the second secondary winding of the transformer are coupled to the first primary winding, and the third secondary winding and the fourth secondary winding of the transformer are coupled to the second primary winding.
4. A bi-directional DC-DC conversion circuit according to claim 3, wherein the transformer comprises a first sub-transformer comprising said first primary winding, a first secondary winding and a second secondary winding, and a second sub-transformer comprising said second primary winding, a third secondary winding and a fourth secondary winding.
5. The bi-directional DC-DC conversion circuit according to claim 1, wherein the inverter circuit is a full-bridge inverter circuit.
6. The bidirectional DC-DC conversion circuit of claim 1, comprising two input capacitors and two output capacitors, wherein the input ends of the two inverter circuits are connected in series and then connected to the DC input end, the first input capacitor is connected between the positive electrode and the negative electrode of the input end of the first inverter circuit, and the second input capacitor is connected between the positive electrode and the negative electrode of the input end of the second inverter circuit; the first output capacitor is connected with the output end of the first switching tube rectifying circuit in parallel, and the second output capacitor is connected with the output end of the third switching tube rectifying circuit in parallel.
7. The bi-directional DC-DC converter circuit of claim 1 wherein said switching tube rectifier circuit is a switching tube full bridge rectifier circuit.
8. The bidirectional DC-DC conversion circuit as recited in claim 1 wherein the bidirectional DC-DC conversion circuit comprises three output switches, wherein a negative electrode of the output terminal of the first switching tube rectifying circuit is connected to a positive electrode of the output terminal of the third switching tube rectifying circuit through the first output switch; the positive electrode of the output end of the first switching tube rectifying circuit is connected with the positive electrode of the output end of the third switching tube rectifying circuit through the second output switch, and the negative electrode of the output end of the first switching tube rectifying circuit is connected with the negative electrode of the output end of the third switching tube rectifying circuit through the third output switch.
9. The bi-directional DC-DC conversion circuit of claim 8 wherein the bi-directional DC-DC conversion circuit operates in a forward direction in two modes: when the first output switch is closed, the second output switch and the third output switch are opened, and the high-voltage output is realized; the first output switch is turned off, and the second output switch and the third output switch are turned on to output low voltage.
10. The bi-directional DC-DC conversion circuit of claim 8 wherein the bi-directional DC-DC conversion circuit operates in reverse comprising two modes of operation: when the reverse input voltage VB is higher, the first output switch is closed, and the second output switch and the third output switch are opened; when the reverse input voltage is low, the first output switch is open, and the second and third output switches are closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111545550.8A CN113938026B (en) | 2021-12-17 | 2021-12-17 | Bidirectional DC-DC conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111545550.8A CN113938026B (en) | 2021-12-17 | 2021-12-17 | Bidirectional DC-DC conversion circuit |
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| Publication Number | Publication Date |
|---|---|
| CN113938026A CN113938026A (en) | 2022-01-14 |
| CN113938026B true CN113938026B (en) | 2023-05-16 |
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| CN112953253A (en) * | 2021-03-11 | 2021-06-11 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Unidirectional alternating current power electronic transformer topology and power balance control method thereof |
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