CN209358441U - A kind of two-way changing circuit and converter comprising dual resonant cavity - Google Patents
A kind of two-way changing circuit and converter comprising dual resonant cavity Download PDFInfo
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- CN209358441U CN209358441U CN201920313288.6U CN201920313288U CN209358441U CN 209358441 U CN209358441 U CN 209358441U CN 201920313288 U CN201920313288 U CN 201920313288U CN 209358441 U CN209358441 U CN 209358441U
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Abstract
The utility model provides a kind of two-way changing circuit and converter comprising dual resonant cavity.The circuit includes primary side full bridge inverter, equalizing circuit, resonant cavity and secondary side rectification circuit parallel with one another.The resonant cavity is by series resonance inductor, resonant capacitance and is adapted to the transformer primary side used with the resonant cavity and constitutes.Equalizing circuit is connected in parallel between two transformer secondaries, which ensures that two transformers input same energy, guarantees that two transformers are working properly, fault occurs to prevent wherein some transformer station high-voltage side bus imbalance.Two resonant converters can alleviate the burden of single resonant cavity, reduce the volume of magnetic elements, keep layout more reasonable, be conducive to thermal design, be more advantageous to raising power density.Way traffic of this topology can also improve that devices use rate is higher, be conducive to the volume for reducing converter, improve power utilization density.
Description
Technical field
The utility model relates to controlled resonant converter, more particularly to it is a kind of can with way traffic and be dual resonant cavity
LLC resonant converter.
Background technique
Increasingly increased current in energy demand, tapping a new source of energy, it is important more to highlight with raising energy utilization rate, various
New energy product is begun to appear in our life.Wherein two-way DC/DC converter converter is in micro-grid energy storage system, electricity
It suffers from and is widely applied in electrical automobile, charging pile.LLC resonant transformation topology is more outstanding in DC/DC converter and has more
There is extensive practical significance, there is realization to improve working efficiency, increase power density, reduces running wastage, reduces electromagnetic interference
The advantages that, in favor of the high-end field of power supplies by engineer.
LLC resonant converter early has become the hot spot of academic worker and engineer's research.Controlled resonant converter is Sofe Switch
One kind, switch element on or off when voltage zero or electric current are zero can be made using the resonance of circuit, thus real
The reduction of existing switching loss.Since LLC resonant converter can not only realize no-voltage conducting, two pole of secondary side of primary side switch pipe
The zero-current switching of pipe reduces switching loss, and resonant inductance and magnetizing inductance can also be integrated in transformer, reduces
The volume of transformer improves power density, while it can be such that output voltage is not lacked by duty ratio using frequency modulation control
The influence of mistake outputs and inputs voltage range with wider, but also can be made into forward and reverse equal DC/DC transformation that can be run
Device, so being widely used and developing in high frequency and hyperfrequency field.
The single resonance chamber LLC resonant converter of full-bridge way traffic is as shown in Figure 1, by power MOS pipe Q1, Q3 and Q2, Q4
Two bridge arms are respectively constituted, and metal-oxide-semiconductor has body diode and parasitic capacitance.Two bridge arms constitute full bridge inverter to resonance
Chamber provides the square-wave voltage that input waveform is ± Udc.When Q1, Q4 shutdown, resonant inductance Lr, resonant capacitance Cr and transformer
Exciting current Lm resonance together, is connected the body diode of Q2, Q3, is 0 by the voltage clamping at the both ends Q2, Q3, thus to realize
The ZVS of Q2, Q3 are ready；Similarly, when Q2, Q3 shutdown, the magnetizing inductance of resonant inductance Lr1, resonant capacitance Cr1 and transformer
Lm resonance together, is connected the body diode of Q1, Q4, by its both end voltage clamper in zero volt, to realize that ZVS is ready.Instead
Similarly to operation.
Currently, energy conservation is an important trend of power technology, efficiency, power density, reliability of power supply etc. are proposed
Higher requirement, under the influence of this trend, LLC resonant cavity in the industry cycle using more and more extensive, but traditional LLC
There is also following shortcomings for controlled resonant converter: existing switch power module, usually all uses the LLC of single resonance chamber.But
With greatly improving for modular power, the volume of power magnetic component is also increasing, to accomplish real high power density, efficiently
Rate, optimal thermal design, this common single resonance chamber LLC are then difficult to realize.In addition, in LLC the magnetizing inductance of transformer it is big
The size of the small cut-off current that decide switching tube, primary current, for efficiency, it is desirable to magnetizing inductance more greatly, still
Due to being limited by module output voltage and power, magnetizing inductance again cannot be excessive, and too big magnetizing inductance will lead to gain
Deficiency, the working frequency that LLC can not export the larger voltage of requirement, full-load power or maximum output voltage full load are close
The frequency separation in the region ZVS, ZCS.
Summary of the invention
The utility model provides a kind of two-way changing circuit and converter comprising dual resonant cavity, at least in certain journey
It solves the problems, such as to mention in background technique on degree.
The one side of the utility model, provides a kind of two-way changing circuit comprising dual resonant cavity, including main switch circuit,
First resonant cavity, the second resonant cavity, inductance (Lp), the first rectification circuit and the second rectification circuit；Wherein,
Main switch circuit includes the first output end and second output terminal；
First resonant cavity include concatenated first resonant inductance (Lr1), the first resonant capacitance (Cr1) and with the first resonance
The primary side (Lm1) for the first transformer that chamber adaptation uses, the second resonant cavity includes concatenated second resonant inductance (Lr2), second
Resonant capacitance (Cr2) and the primary side (Lm2) that the second transformer used is adapted to the first resonant cavity；First resonant cavity and second
After resonant cavity is in parallel, it is connected between the first output end and second output terminal；
Inductance (Lp) is connected between the first output end and second output terminal；
First rectification circuit is connect with the secondary side of first transformer, the second rectification circuit and second transformation
The secondary side of device connects.
It further, further include equalizing circuit, equalizing circuit is connected to the secondary side of first transformer and described
Between the secondary side of second transformer.Preferably, equalizing circuit includes balanced capacitor (Cj), alternatively, equalizing circuit includes concatenated
Small resistance and balanced capacitor (Cj).
Further, main switch circuit includes the first power MOS pipe (Q1), the second power MOS pipe (Q2), third power
Metal-oxide-semiconductor (Q3), the 4th power MOS pipe (Q4) and capacitor (Ci), the source electrode and third power MOS pipe of the first power MOS pipe (Q1)
(Q3) drain electrode is connected together as the first output end, the source electrode of the second power MOS pipe (Q2) and the 4th power MOS pipe (Q4)
Drain electrode be connected together as second output terminal；One end of capacitor (Ci) and drain electrode, second function of the first power MOS pipe (Q1)
The drain electrode of rate metal-oxide-semiconductor (Q2) links together, the other end of capacitor (Ci) and source electrode, the 4th function of third power MOS pipe (Q3)
The source electrode of rate metal-oxide-semiconductor (Q4) links together.Preferably, the first power MOS pipe (Q1), the second power MOS pipe (Q2), third function
Rate metal-oxide-semiconductor (Q3) and the 4th power MOS pipe (Q4) are MOS memory MOSFET.
Further, the first rectification circuit includes the 5th power MOS pipe (Q5) and the 6th power MOS pipe (Q6), described
The secondary side of first transformer is separately connected the source electrode of the 5th power MOS pipe (Q5) and the source electrode of the 6th power MOS pipe (Q6)；Second
Rectification circuit includes the 7th power MOS pipe (Q7) and the 8th power MOS pipe (Q8), and the secondary side of second transformer connects respectively
Connect the source electrode of the 7th power MOS pipe (Q7) and the source electrode of the 8th power MOS pipe (Q8)；The drain electrode of 5th power MOS pipe (Q5),
The drain electrode of six power MOS pipes (Q6), the drain electrode of the 7th power MOS pipe (Q7) and the drain electrode of the 8th power MOS pipe (Q8) are connected to
Together, as rectification circuit output end.Preferably, the 5th power MOS pipe (Q5), the 6th power MOS pipe (Q6), the 7th power
Metal-oxide-semiconductor (Q7) and the 8th power MOS pipe (Q8) are MOS memory MOSFET.
It further, further include filter circuit, filter circuit is connect with rectification circuit output end.
The another aspect of the utility model provides a kind of converter comprising the above-mentioned two-way change comprising dual resonant cavity
Change circuit.
The utility model has the beneficial effects that (1) dual resonant cavity parallel connection can transmit bigger power, and can subtract significantly
The volume of small magnetic elements, so that layout is more compact；(2) due to two resonant cavity devices, when processing ground, there are technique mistakes
Difference solves common single resonance chamber LLC so that two resonant cavity transformer equalizations export energy by the effect of balanced device
It applies and is difficult to accomplish the problem of high efficiency, high power density, optimal thermal design etc. require in current high power switching power supply；
(3) since transformer secondary is without connection resonating device, first device is reduced compared with common CLLLC two-way resonance converter
The number of part, has saved cost；(4) output of each transformer exports after distinguishing rectified circuit rectifies, so that output is more
Stablize.
Detailed description of the invention
In order to be more likely to be clearly understood the content of the utility model, below according to the specific implementation of the utility model
Example and in conjunction with attached drawing, the utility model is described in further detail.
Fig. 1 is a kind of circuit diagram of full-bridge CLLLC two-way resonance converter in the prior art.
Fig. 2 is a kind of topological diagram of two-way changing circuit comprising dual resonant cavity of the utility model.
Schematic diagram when Fig. 3 is a kind of two-way changing circuit inverted running comprising dual resonant cavity of the utility model.
Fig. 4 is a kind of two-way changing circuit comprising dual resonant cavity forward direction operation when lower than high frequency points of the utility model
Shi Xiangguan real-time waveform.
Fig. 5 be the utility model a kind of two-way changing circuit comprising dual resonant cavity when lower than high frequency points inverted running
Shi Xiangguan real-time waveform.
Specific embodiment
As shown in Fig. 2, a kind of two-way changing circuit comprising dual resonant cavity of the utility model, including main switch circuit,
First resonant cavity, the second resonant cavity, inductance, equalizing circuit, the first rectification circuit, the second rectification circuit and filter circuit.Master opens
Powered-down road is sometimes referred to as square-wave generator, and square-wave generator is many kinds of, and the square-wave generators such as full-bridge and half-bridge can be used.
In the present embodiment, using full-bridge square-wave generator, Q1-Q4 is that MOSFET, Q1 and Q3 series connection, Q2 and Q4 series connection respectively constitute bridge
The source electrode of arm, Q3 and Q4 are grounded, and power supply Udc is connected in parallel between two bridge arms constitutes full bridge inverter (i.e. square wave generation together
Device).Inductance Lp is connected to the midpoint of i.e. two bridge arms between ac bus.Capacitor Ci is connected in parallel on the both ends DC power supply Udc, anode
It is connect with the anode of Udc, the cathode connect and ground of cathode and Udc.First resonant cavity is by inductance Lr1, capacitor Cr1, excitation electricity
The primary side for feeling Lm1 and transformer TX1 is constituted；Second resonant cavity is by inductance Lr2, capacitor Cr2, magnetizing inductance Lm2 and transformer TX2
Primary side constitute.Company is connected in series to the capacitor by resistance between the reference point GND of TX1 and TX2 primary side and the reference point AGND on secondary side
It connects.Two are included at least with the resonant cavity that main switch circuit is in parallel, equalizing circuit is connected to the resonant cavity of main equilibrium point
Between remaining resonant cavity.When error occurs in the resonating device of two resonant cavities, balanced device must be added between two resonant cavities.
It is consistent, but due to the appearance of fabrication error, therefore needs on Lr1 and Lr2, Cr1 and Cr2, Lm1 and Lm2, TX1 and TX2 scheduling theory
Add balanced device.In the present embodiment, balanced device is balanced capacitor Cj, is connected to the secondary side of first transformer and described
Between the secondary side of second transformer.The rectification circuit that two transformer secondaries are constituted can be double half-wave rectification, but also full-bridge
Rectification circuit.In the present embodiment, Q5 and Q6 constitutes the corresponding rectifying part of the first resonant cavity, i.e. the first rectification circuit；Q7 and
Q8 constitutes the corresponding rectifying part of the second resonant cavity, i.e. the second rectification circuit.Q5, Q6, Q7, Q8 are MOSFET, this topology can
With way traffic.Capacitor Co constitutes current rectifying and wave filtering circuit, and anode is connected with load, cathode ground connection.
In topology shown in Fig. 2, Q1-Q8 is power MOSFET, including body diode and parasitic capacitance.Q1 and Q3 string
Connection connection, the drain electrode of the source electrode and Q3 of Q1 link together as the first output end of full-bridge circuit, the drain electrode of Q1 and DC power supply
Anode (BUS+) connection, the cathode of the source electrode of Q3 and power supply connects (BUS-), and is grounded (GND), constitutes bridge arm；Similarly Q2
It is connected in series with Q4 and constitutes bridge arm, the drain electrode of Q2 source electrode and Q4 links together as the second output terminal of full-bridge circuit.So far Q1-
Q4 constitutes a full-bridge circuit.An inductance Lp is connected at the midpoint of two bridge arms, inductance value is static exciter inductance
Value.Two resonant cavities tank1 and tank2 are arranged in parallel between the first output end and second output terminal, tank1 includes resonance electricity
Feel Lr1, resonant capacitance Cr1, the first transformer primary winding provide magnetizing inductance Lm1, tank2 include resonant inductance Lr2, it is humorous
The magnetizing inductance Lm2 that capacitor Cr2, the second transformer primary winding of shaking provide.
Specifically, the first output end of one end connection main switch circuit of resonant inductance Lr1, the other end connect resonant capacitance
One end of Cr1, the other end of Cr1 connect one end (namely one end of magnetizing inductance Lm1) of the first transformer primary side, and first becomes
The second output terminal of the other end (the namely other end of magnetizing inductance Lm1) the connection main switch circuit of depressor primary side.Second is humorous
The connection type of vibration chamber is identical as the first resonant cavity.
Transformer TX1 pair side with tapped winding and Q5, Q6 by being formed by connecting a full-wave rectifying circuit, transformation
Device TX2 pair side with tapped winding and Q7, Q8 by being formed by connecting a full-wave rectifying circuit.Above-mentioned transformer secondary
Winding centre tap is grounded (AGND).The source electrode (pole S) of Q5-Q8 is connected with the output end of transformer respectively.By being driven to Q5-Q8
Dynamic signal, the electrical level polar of driving signal and the output signal level polarity of transformer are identical.What it is due to Q5-Q8 is full control device
Part, transformer secondary circuit, which can both become current rectifying and wave filtering circuit, can also become push-pull inverter circuit, therefore be the two-way fortune of the topology
Row provides condition.The output superposition of two transformers, improves the stability of output power.It is defeated after above-mentioned MOSFET connection
Outlet is also connected with filter circuit, which can be a capacitor, and one end is connected to the cathode of MOSFET, other end ground connection
(AGND)。
The two-way changing circuit of the utility model has buffer action, and the ground, that is, GND and AGND on former and deputy side pass through resistance
Capacitor (RC) is connected in series.The course of work of entire circuit approximately as:
When forward direction operation, Lp branch is not worked by relay cutting.(the i.e. dead zone during Q1, Q2, Q3, Q4 are turned off
In time) Lr1, Cr1, Lm1 and Lr2, Cr2, Lm2 respectively constitute resonant cavity, and the total resonance current of two resonant cavities is to Q2, Q3
Parasitic capacitance Coss2, Coss3 charges while to the electric discharge of parasitic capacitance Coss1, Coss4, energy between the D-S of Q1, Q4 between D-S
Amount is fed back to power supply.Q5, Q6, Q7, Q8 are turned off at this time, and the energy of output is provided by output electrolytic capacitor.As Coss1, Coss4
In energy exhausted, the body diode afterflow of Q1, Q4, for Q1, Q4 realize ZVS create conditions.The Q5 and Q7 of control output at this time
Conducting, transformer are clamped at-nVo, Lm1 and Lm2 and are not involved in resonance in the charging of this voltage lower linear, transformer T1 primary side,
Transformer T2 primary side has electric current to flow through, and the gross energy of two resonant cavities is fed to output.(i.e. Q1, Q4 body diode at this time
When starting afterflow) give Q1, Q4 driving signal, then Q1, Q4 are able to achieve ZVS, and primary voltage of transformer is still clamped at-nVo, humorous
Energy stream of shaking is consistent through path and on last stage, is also fed to secondary side.The working principle of following negative half-cycle and above-mentioned just half
Period it is similar.As can be seen from Figure 4 when embodiment forward direction operation working frequency is lower than high frequency points, primary side main switch is zero electricity
Pressure conducting, secondary side zero-current switching.
When inverted running, transformer secondary constitutes the input circuit of push-pull inverter circuit that is, the resonant cavity of inverted running,
The output rectification circuit of rectification circuit that is, the resonant cavity of inverted running that primary side main switch circuit Q1-Q4 is constituted.It controls simultaneously
Q5 and Q6 alternate conduction, Q7 and Q8 alternate conduction, the branch where inductance Lp is controlled by relay to be connected, and Lp is acted as reversely
The magnetizing inductance of operation.When Q5-Q8 is turned off, during Q1-Q4 is turned off (in dead time), Lr1, Cr1, Lp and Lr2,
Cr2, Lp respectively constitute resonant cavity, and two resonant electric currents give parasitic capacitance (D-S) Coss5 of Q5 and Q6 hourglass source electrode respectively
With parasitic capacitance (D-S) Coss7 and Coss8 charge and discharge of Coss6, Q7 and Q8 hourglass source electrode, energy feedback to power supply.It is defeated at this time
MOSFET (Q1-Q4) is turned off, and the energy of output is provided by output electrolytic capacitor (electrolytic capacitor in parallel with Udc).When
Energy in Coss5, Coss7 is exhausted, the body diode afterflow of Q5, Q7, realizes that ZVS creates conditions for Q5, Q7.It controls at this time
Output Q1 is connected with Q4, and transformer is clamped at-Vdc, and Lm is not involved in resonance, only Lr1 and Cr1 in the charging of this voltage lower linear
The ac bus that a resonant electric current flows through the full-bridge that Lp and Q1-Q4 is constituted is constituted, it is humorous that Lr2 and Cr2 constitutes another
Vibration chamber resonance current flows through the ac bus for the full-bridge that Lp and Q1-Q4 is constituted, and the gross energy of two resonant cavities is fed to output.This
When give Q5, Q7 driving signal, realize ZVS, primary voltage of transformer is still clamped at-Vdc, resonant energy flow through path with it is upper
One stage is consistent, is also fed to secondary side.The working principle of following negative half-cycle is similar with above-mentioned positive half period.In terms of Fig. 5
When embodiment inverted running working frequency is lower than high frequency points, primary side main switch is no-voltage conducting, secondary side zero current pass out
It is disconnected.
Balanced device function analysis: forward direction operation when not having capacitor, due to the difference of the technological parameter of component, causes
The gain of two resonant cavities is inconsistent, and the rectifying tube of two resonant cavities output is parallel to a bit, and such parallel output may be led
Wherein the lesser resonant cavity of gain can not export energy for cause, another resonant cavity is caused to overload, and easily cause circuit damage.Work as electricity
In the presence of appearance, so that the unloaded gain of the lesser resonant cavity of script gain is greater than the biggish resonance of script gain in a certain range
Normally band carries gain to chamber, and makes the phase of 2 resonant cavity transformer points is approximate unanimously to make two resonant cavities in larger frequency model
Impartial energy can be exported in enclosing.
The LLC of resonant cavity parallel connection sets up balancing capacitance between two neighboring resonant cavity in a word, ensure that each resonant cavity
Energy can be balanced, it is ensured that the utility model topology can way traffic, thus can achieve the effect of this topological structure
Fruit.The resonant operational principle of each resonant cavity with the LLC working principle of single resonance chamber be it is similar, only flow through main switch every time
The resonant energy of circuit metal-oxide-semiconductor and transformer is the summation of all resonant cavity energy, and the program can largely add again
Big magnetizing inductance both can guarantee LLC gain or can be further improved the effect of high-power LLC resonant converter.
Claims (10)
1. a kind of two-way changing circuit comprising dual resonant cavity, including main switch circuit, the first resonant cavity, the second resonant cavity, electricity
Sense, the first rectification circuit and the second rectification circuit；Wherein,
Main switch circuit includes the first output end and second output terminal；
First resonant cavity includes concatenated first resonant inductance, the first resonant capacitance and is adapted to used with the first resonant cavity
The primary side of one transformer, the second resonant cavity include concatenated second resonant inductance, the second resonant capacitance and with the first resonant cavity
It is adapted to the primary side of the second transformer used；After first resonant cavity is in parallel with the second resonant cavity, it is connected to the first output end and
Between two output ends；
Inductance connection is between the first output end and second output terminal；
First rectification circuit is connect with the secondary side of first transformer, the second rectification circuit and second transformer
Secondary side connection.
2. the two-way changing circuit according to claim 1 comprising dual resonant cavity, it is characterised in that: further include balanced electricity
Road, equalizing circuit be connected to first transformer it is secondary while second transformer it is secondary while between.
3. the two-way changing circuit according to claim 2 comprising dual resonant cavity, it is characterised in that: equalizing circuit includes equal
Weigh capacitor.
4. the two-way changing circuit according to claim 3 comprising dual resonant cavity, it is characterised in that: equalizing circuit includes string
The small resistance of connection and balanced capacitor.
5. the two-way changing circuit according to claim 1 comprising dual resonant cavity, it is characterised in that: main switch circuit includes
First power MOS pipe, the second power MOS pipe, third power MOS pipe, the 4th power MOS pipe and capacitor, the first power MOS pipe
The drain electrode of source electrode and third power MOS pipe is connected together as the first output end, the source electrode of the second power MOS pipe and the 4th function
The drain electrode of rate metal-oxide-semiconductor is connected together as second output terminal；The drain electrode of one end of capacitor and the first power MOS pipe, the second function
The drain electrode of rate metal-oxide-semiconductor links together, the other end and the source electrode of third power MOS pipe, the source electrode of the 4th power MOS pipe of capacitor
It links together.
6. the two-way changing circuit according to claim 5 comprising dual resonant cavity, it is characterised in that: the first power MOS pipe,
Second power MOS pipe, third power MOS pipe and the 4th power MOS pipe are MOS memory MOSFET.
7. the two-way changing circuit according to claim 1 comprising dual resonant cavity, it is characterised in that: the first rectification circuit packet
The 5th power MOS pipe and the 6th power MOS pipe are included, the secondary side of first transformer is separately connected the 5th power MOS pipe
The source electrode of source electrode and the 6th power MOS pipe；Second rectification circuit includes the 7th power MOS pipe and the 8th power MOS pipe, described
The secondary side of second transformer is separately connected the source electrode of the 7th power MOS pipe and the source electrode of the 8th power MOS pipe；5th power MOS
The drain electrode of pipe, the drain electrode of the 6th power MOS pipe, the drain electrode of the 7th power MOS pipe and the drain electrode of the 8th power MOS pipe are connected to one
It rises, as rectification circuit output end.
8. the two-way changing circuit according to claim 7 comprising dual resonant cavity, it is characterised in that: the 5th power MOS pipe,
6th power MOS pipe, the 7th power MOS pipe and the 8th power MOS pipe are MOS memory MOSFET.
9. the two-way changing circuit according to claim 7 comprising dual resonant cavity, it is characterised in that: further include filtered electrical
Road, filter circuit are connect with rectification circuit output end.
10. a kind of converter, it is characterised in that: including including dual resonant cavity described in claim 1~9 any claim
Two-way changing circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920313288.6U CN209358441U (en) | 2019-03-13 | 2019-03-13 | A kind of two-way changing circuit and converter comprising dual resonant cavity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920313288.6U CN209358441U (en) | 2019-03-13 | 2019-03-13 | A kind of two-way changing circuit and converter comprising dual resonant cavity |
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| CN209358441U true CN209358441U (en) | 2019-09-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787479A (en) * | 2019-03-13 | 2019-05-21 | 南昌航空大学 | A kind of two-way changing circuit and converter comprising dual resonant cavity |
| CN113067479A (en) * | 2021-03-25 | 2021-07-02 | 国文电气股份有限公司 | Charging module DC/DC topological circuit |
-
2019
- 2019-03-13 CN CN201920313288.6U patent/CN209358441U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787479A (en) * | 2019-03-13 | 2019-05-21 | 南昌航空大学 | A kind of two-way changing circuit and converter comprising dual resonant cavity |
| CN113067479A (en) * | 2021-03-25 | 2021-07-02 | 国文电气股份有限公司 | Charging module DC/DC topological circuit |
| CN113067479B (en) * | 2021-03-25 | 2023-06-27 | 国文电气股份有限公司 | DC/DC topological circuit of charging module |
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