CN101047337A - Three-level LLC resonance inverter - Google Patents
Three-level LLC resonance inverter Download PDFInfo
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- CN101047337A CN101047337A CNA200710073867XA CN200710073867A CN101047337A CN 101047337 A CN101047337 A CN 101047337A CN A200710073867X A CNA200710073867X A CN A200710073867XA CN 200710073867 A CN200710073867 A CN 200710073867A CN 101047337 A CN101047337 A CN 101047337A
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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
Abstract
A LLC resonant converter of three-level type is featured as clamping voltage of resonant capacity on input voltage through common action of clamp winding and resonant inductance as well as clamping diode for realizing purpose of suppressing switch current stress of primary edge when resonant converter is overloaded or short-circuited, deciding switch current stress of primary edge commonly by input bus level and clamping circuit when output of said converter is short-circuited.
Description
Technical field
The present invention relates to the DC converting technical field, relate in particular to a kind of three-level LLC resonance inverter.
Background technology
Controlled resonant converter generally includes two inputs, is used to apply input voltage; Two outputs are used to provide output voltage; A resonance oscillations loop, it can be connected with input voltage according to its beat of resonance frequency.The coil in resonance oscillations loop and another coil-induced coupling, the latter is connected with two outputs by a rectification circuit.
Three-level LLC resonance inverter as shown in Figure 1 is a kind of controlled resonant converter, and it is open-minded that the main switch of this converter is operated in no-voltage, and rectifier is operated in zero-current switching.Though; three-level LLC resonance inverter has advantage as mentioned above; but converter is operated near the resonance frequency; when load overload or short circuit; converter shows as main switch, and to lose no-voltage open-minded; the main switch current stress is too high, and three-level LLC resonance inverter may just not lose efficacy when protective circuit responds.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of three-level LLC resonance inverter, and when making controlled resonant converter load overload or short circuit, it is open-minded that this converter can avoid main switch to lose no-voltage, the problem that current stress is too high.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions.
A kind of three-level LLC resonance inverter, comprise bleeder circuit (110), resonant capacitance (Cr), first fly-wheel diode (D5), second fly-wheel diode (D6), switching circuit (130), resonant inductance (Lr), first magnetizing inductance (Lm1), first transformer (T1), first rectification circuit (140), one end of described bleeder circuit (110) is connected in parallel on input, the other end is in parallel with described switching circuit (130), described resonant capacitance (Cr), an end was connected the mid point of described bleeder circuit (110) after resonant inductance (Lr) was connected with the former limit of described first transformer (T1), the other end is electrically connected with the mid point of described switching circuit (130), described first magnetizing inductance (Lm1) is connected in parallel on the former limit of described first transformer (T1), described first fly-wheel diode (D5) links to each other with the mid point of described bleeder circuit (110) respectively with an end of second fly-wheel diode (D6), the other end links to each other with described switching circuit (130) respectively, the secondary of described first transformer (T1) is in parallel with an end of described rectification circuit (140), the other end of described first rectification circuit (140) is connected output, described three-level LLC resonance inverter also comprises a clamp circuit (120), described clamp circuit (120) comprises first clamping diode (D7) and second clamping diode (D8), first clamping diode (D7) be connected in parallel on input after second clamping diode (D8) is connected, an end of described resonant capacitance (Cr) is electrically connected with the mid point of described first clamping diode (D7) and second clamping diode (D8).
Wherein, described three-level LLC resonance inverter also comprises a clamp winding, one end of described clamp winding links to each other with the end of the same name of described resonant inductance (Lr), and an end of described resonant capacitance (Cr) is electrically connected with the mid point of described first clamping diode (D7) and second clamping diode (D8) by resonant inductance (Lr) and described clamp winding.
Wherein, described three-level LLC resonance inverter also comprises second magnetizing inductance (Lm2), second transformer (T2), second rectification circuit, former limit one end of described second transformer (T2) is connected with the former limit of described first transformer (T1), the other end is electrically connected with the mid point of described switching circuit (130), and described second magnetizing inductance (Lm2) is connected in parallel on the former limit of described second transformer (T2); One end of described second rectification circuit is connected in parallel on the secondary of described second transformer (T2), the other end is connected an end of output, the centre cap of described first transformer (T1) secondary and the other end that is connected output after the centre cap of second transformer (T2) secondary is in parallel.
Wherein, described three-level LLC resonance inverter also comprises a clamp winding, one end of described clamp winding links to each other with the end of the same name of described first transformer (T1), and an end of described resonant capacitance (Cr) is electrically connected with the mid point of described first clamping diode (D7) and second clamping diode (D8) by resonant inductance (Lr) and described clamp winding.
Wherein, described three-level LLC resonance inverter also comprises second magnetizing inductance (Lm2), second transformer (T2), second rectification circuit, former limit one end of described second transformer (T2) is connected with the former limit of described first transformer (T1), the other end is electrically connected with the mid point of described switching circuit (130), and described second magnetizing inductance (Lm2) is connected in parallel on the former limit of described second transformer (T2); One end of described second rectification circuit is connected in parallel on the secondary of described second transformer (T2), the other end is connected an end of output, the centre cap of described first transformer (T1) secondary and the other end that is connected output after the centre cap of second transformer (T2) secondary is in parallel.
Wherein, described rectification circuit is center-tap rectifier circuit or full bridge rectifier.
Wherein, described three-level LLC resonance inverter also comprises filter capacitor (C), and described filter capacitor (C) is connected in parallel on output.
Above technical scheme as can be seen, the present invention has following beneficial effect:
When controlled resonant converter load overload of the present invention or short circuit, the coupling by clamp winding and resonant inductance or transformer and the acting in conjunction of clamping diode with the voltage clamp of resonant capacitance in input voltage or other value, thereby reach the purpose that suppresses former limit switching current stress, simultaneously under the situation that main circuit parameter is determined, during the converter output short-circuit, former limit switching current stress is determined jointly that by inlet highway level and clamp circuit former limit switching tube current stress can flexible design.
Description of drawings
Fig. 1 is existing three-level LLC resonance inverter circuit diagram;
Fig. 2 is the three-level LLC resonance inverter circuit diagram with diode clamp;
Fig. 3 is the dual transformer three-level LLC resonance inverter circuit diagram with diode clamp;
Fig. 4 is the three-level LLC resonance inverter circuit diagram with the auxiliary winding clamp of resonant inductance;
Fig. 5 is the dual transformer three-level LLC resonance inverter circuit diagram with the auxiliary winding clamp of resonant inductance;
Fig. 6 is the three-level LLC resonance inverter circuit diagram with the auxiliary winding clamp of transformer;
Fig. 7 is for having the auxiliary winding clamp dual transformer three-level LLC resonance inverter circuit diagram of transformer;
Fig. 8 is the main oscillogram of three-level LLC resonance inverter of the present invention;
Fig. 9/Figure 10/Figure 11/Figure 12/Figure 13 a/ Figure 13 b/ Figure 14/Figure 15 is three-level LLC resonance inverter of the present invention fundamental diagram under different mode.
Embodiment
Core concept of the present invention is: when controlled resonant converter load overload or short circuit, the coupling by clamp winding and resonant inductance or transformer and the acting in conjunction of clamping diode with the voltage clamp of resonant capacitance in input voltage or other value, thereby it is open-minded to avoid main switch to lose no-voltage, suppresses the purpose of former limit switching current stress.
Be described in further detail below in conjunction with drawings and the specific embodiments.
See also the three-level LLC resonance inverter circuit diagram with diode clamp shown in Figure 2, comprise bleeder circuit 110, resonant capacitance Cr, first sustained diode 5, second sustained diode 6, clamp circuit 120, switching circuit 130, resonant inductance Lr, the first magnetizing inductance Lm1, the first transformer T1, first rectification circuit 140, filter capacitor C; Bleeder circuit 110 comprises the first dividing potential drop electric capacity c1 and the second dividing potential drop electric capacity c2, the first dividing potential drop electric capacity c1 be connected in parallel on input after the second dividing potential drop electric capacity c2 connects; Clamp circuit 120 comprises the first clamping diode D7 and the second clamping diode D8, and negative electrode was connected positive input terminal after the first clamping diode D7 connected with the second clamping diode D8, and anode is connected negative input end; Switching circuit 130 comprises the first switch Q1, second switch Q2, the 3rd switch Q3 and the 4th switch Q4, is connected in parallel on input after the first switch Q1, second switch Q2, the 3rd switch Q3 and the 4th switch Q4 series connection; The anode of first sustained diode 5 and the mid point that is connected the first dividing potential drop electric capacity c1 and the second dividing potential drop electric capacity c2 after the negative electrode of second sustained diode 6 is in parallel, the negative electrode of first sustained diode 5 is connected the mid point of the first switch Q1 and second switch Q2, and the anode of second sustained diode 6 is connected the mid point of the 3rd switch Q3 and the 4th switch Q4; An end was connected the mid point of the first dividing potential drop electric capacity c1 and the second dividing potential drop electric capacity c2 after resonant capacitance Cr connected with resonant inductance Lr, the other end links to each other with an end on the former limit of the first transformer T1, the other end on the former limit of the first transformer T1 is connected the mid point of second switch Q2 and the 3rd switch Q3, resonant capacitance Cr is electrically connected with the mid point of the second clamping diode D8 with the first clamping diode D7 with the mid point of resonant inductance Lr, and the first magnetizing inductance Lm1 is connected in parallel on the former limit of the first transformer T1; First rectification circuit 140 comprises the first rectifier diode D9 and the second rectifier diode D10, the anode of the first rectifier diode D9 and the second rectifier diode D10 links to each other with the secondary of the first transformer T1 respectively, be connected an end of output after its negative electrode parallel connection, the other end of output links to each other with the centre cap of the secondary of the first transformer T1, and filter capacitor C is connected in parallel on output.
Wherein, rectification circuit 140 can adopt center-tap rectifier circuit or full bridge rectifier, resonant inductance Lr can be the outer coilloading of the leakage inductance of transformer or transformer former limit series connection and connecting of transformer leakage inductance, magnetizing inductance Lm can be the magnetizing inductance of transformer or the former limit of transformer add the in parallel of shunt inductance and transformer excitation inductance.
Dual transformer three-level LLC resonance inverter circuit diagram with diode clamp shown in Figure 3, it has increased by the second magnetizing inductance Lm2 on the basis of Fig. 2, the second transformer T2, second rectification circuit, the first transformer T1 links to each other with resonant inductance Lr with series connection back, former limit one end of the second transformer T2, and the other end is connected the mid point of second switch Q2 and the 3rd switch Q3; The first magnetizing inductance Lm1 be connected in parallel on the former limit of the first transformer T1 and the second transformer T2 after the second magnetizing inductance Lm2 connects, the second magnetizing inductance Lm2 is connected in parallel on the former limit of the second transformer T2; Second rectification circuit comprises the 3rd rectifier diode D11 and the 4th rectifier diode D12, the anode of the 3rd rectifier diode D11 and the 4th rectifier diode D12 links to each other with the secondary of the second transformer T2 respectively, be connected an end of output after its negative electrode parallel connection, the centre cap of the first transformer T1 secondary and the other end that is connected output after the centre cap of the second transformer T2 secondary is in parallel.
Wherein, the described transformer of Fig. 3 can also be a plurality of transformers such as three, four, and its annexation and operation principle and Fig. 3 are similar.
Fig. 4, Fig. 5 have increased by a clamp winding respectively on the basis of Fig. 2, Fig. 3, an end of clamp winding links to each other with the end of the same name of resonant inductance Lr, and the other end is electrically connected with the mid point of the second clamping diode D8 with the first clamping diode D7.
Fig. 6 has increased by a clamp winding on the basis of Fig. 2, an end of clamp winding links to each other with the end of the same name of the first transformer T1, and the other end is electrically connected with the mid point of the second clamping diode D8 with the first clamping diode D7.
Fig. 7 has increased by the second magnetizing inductance Lm2 on the basis of Fig. 6, the second transformer T2, second rectification circuit, the first transformer T1 links to each other with resonant inductance Lr with series connection back, former limit one end of the second transformer T2, and the other end is connected the mid point of second switch Q2 and the 3rd switch Q3; The first magnetizing inductance Lm1 be connected in parallel on the former limit of the first transformer T1 and the second transformer T2 after the second magnetizing inductance Lm2 connects, the second magnetizing inductance Lm2 is connected in parallel on the former limit of the second transformer T2; Second rectification circuit comprises the 3rd rectifier diode D11 and the 4th rectifier diode D12, the anode of the 3rd rectifier diode D11 and the 4th rectifier diode D12 links to each other with the secondary of the second transformer T2 respectively, be connected an end of output after its negative electrode parallel connection, the centre cap of the first transformer T1 secondary and the other end that is connected output after the centre cap of the second transformer T2 secondary is in parallel.
Wherein, Fig. 4 is more typical a kind of converter among the present invention, introduces its operation principle below.
In following analysis, operation principle when better describing the short circuit attitude is described the operation principle of basic three-level LLC resonance inverter earlier, and a switch periods can be divided into 8 mode of operations, and the corresponding work waveform as shown in Figure 8.The operation principle of 8 mode of operations is described below respectively:
As shown in Figure 9, pattern 1:t0＜t＜t1.At t=t0 constantly, Q1, Q2 are open-minded simultaneously.The transformer primary current flows through Q1 and Q2, the conducting of secondary diode D9 positively biased, and Cr and Lr produce series resonance, and inductance L r electric current is increased to maximum with sinusoidal rule forward and reduces then, flows through linear the increasing of electric current of inductance L m.
As shown in figure 10, pattern 2:t1＜t＜t2.At t1 constantly, the electric current of resonant inductance Lr equates that with the electric current of inductance L m the transformer primary current drops to zero, and secondary current also drops to zero, and diode D9 realizes that ZCS turn-offs naturally.Lm voltage becomes free inductance and Lr series connection and Cr resonance not by clamp.Big more many than Lr because of Lm, harmonic period is long, in t1～t2, can be similar to and think that resonance current is constant.
As shown in figure 11, mode 3: t2＜t＜t3.At t=t2 constantly, send the Q1 cut-off signals, Q2 is conducting still.Resonance current is to the charging of the output junction capacitance of Q1, when Vds1 rises to incoming level one half, and diode D5 conducting, Vds1 is clamped on 1/2 incoming level, and Q1 turn-offs.
As shown in figure 12, pattern 4:t3＜t＜t4.T3 sends the Q2 cut-off signals constantly, and Vds2 rises.When rising to input voltage one half, D3, D4 are biased to zero.For Q3, Q4 no-voltage are opened and are created conditions.
Shown in Figure 13 a, pattern 5:t4＜t＜t5.At t4 constantly, send Q3 simultaneously, Q4 opens signal, is added in the voltage reversal of Cr, Lr, Lm, diode D10 conducting, Cr and Lr generation resonance, resonance current oppositely increases to maximum by sinusoidal rule and reduces then.Inductance L m goes up the electric current reverse linear to be increased.
Shown in Figure 13 b, pattern 6:t5＜t＜t6, in the t5 moment, resonant inductance Lr electric current equates that with inductance L m electric current the transformer primary current drops to zero, and secondary current also will arrive zero, and diode D10 realizes that ZCS turn-offs naturally.
As shown in figure 14, mode 7:: t6＜t＜t7, t6 sends the Q4 cut-off signals constantly, and Q3 is conducting still.Resonance current is to the charging of the output junction capacitance of Q4, when Vds4 rises to incoming level one half, and diode D6 conducting, Vds4 is clamped on 1/2 incoming level, and Q4 turn-offs.
As shown in figure 15, pattern 8::t7＜t＜t8, t7 are constantly, send the Q3 cut-off signals, resonance current is to the output junction capacitance charging of Q3, when Vds3 rises to incoming level one half, diode D1, D2 zero opens and creates conditions for Q1, Q2 no-voltage partially, enters next cycle period.
The former limit of transformer inductor voltage clamping is in zero potential, and the electric current on the inductance L m maintains numerical value before the short circuit constant (as ignore on the loop resistance), and converter is no longer to the load transfer electric energy.Guarantee the magnetic field energy of magnetizing inductance among the resonant capacitance Cr and the energy storage of electric energy is provided to load, all in resonant network, circulate, resonant inductance Lr electric current rises to very high level, connects with resonant network and the switching tube that is in on-state will bear very high current stress, causes permanent failure.Three-level LLC resonance inverter with clamp circuit; the voltage clamp of resonant capacitance Cr can equaled, is being below or above the inlet highway level; converter because of causing the too much circulating energy of resonant network, short circuit is partly fed back to fan-in network; thereby reach the purpose of limit switch tube current stress, the unlikely permanent failure of protection switch pipe.
The present invention has verified the correctness and the feasibility of theory analysis through experiment.
More than a kind of three-level LLC resonance inverter provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1, a kind of three-level LLC resonance inverter, comprise bleeder circuit (110), resonant capacitance (Cr), first fly-wheel diode (D5), second fly-wheel diode (D6), switching circuit (130), resonant inductance (Lr), first magnetizing inductance (Lm1), first transformer (T1), first rectification circuit (140), one end of described bleeder circuit (110) is connected in parallel on input, the other end is in parallel with described switching circuit (130), described resonant capacitance (Cr), an end was connected the mid point of described bleeder circuit (110) after resonant inductance (Lr) was connected with the former limit of described first transformer (T1), the other end is electrically connected with the mid point of described switching circuit (130), described first magnetizing inductance (Lm1) is connected in parallel on the former limit of described first transformer (T1), described first fly-wheel diode (D5) links to each other with the mid point of described bleeder circuit (110) respectively with an end of second fly-wheel diode (D6), the other end links to each other with described switching circuit (130) respectively, the secondary of described first transformer (T1) is in parallel with an end of described rectification circuit (140), the other end of described first rectification circuit (140) is connected output, it is characterized in that, also comprise a clamp circuit (120), described clamp circuit (120) comprises first clamping diode (D7) and second clamping diode (D8), first clamping diode (D7) be connected in parallel on input after second clamping diode (D8) is connected, an end of described resonant capacitance (Cr) is electrically connected with the mid point of described first clamping diode (D7) and second clamping diode (D8).
2, three-level LLC resonance inverter according to claim 1, it is characterized in that: also comprise a clamp winding, one end of described clamp winding links to each other with the end of the same name of described resonant inductance (Lr), and an end of described resonant capacitance (Cr) is electrically connected with the mid point of described first clamping diode (D7) and second clamping diode (D8) by resonant inductance (Lr) and described clamp winding.
3, three-level LLC resonance inverter as claimed in claim 1 or 2, it is characterized in that: also comprise second magnetizing inductance (Lm2), second transformer (T2), second rectification circuit, former limit one end of described second transformer (T2) is connected with the former limit of described first transformer (T1), the other end is electrically connected with the mid point of described switching circuit (130), and described second magnetizing inductance (Lm2) is connected in parallel on the former limit of described second transformer (T2); One end of described second rectification circuit is connected in parallel on the secondary of described second transformer (T2), the other end is connected an end of output, the centre cap of described first transformer (T1) secondary and the other end that is connected output after the centre cap of second transformer (T2) secondary is in parallel.
4, three-level LLC resonance inverter according to claim 1, it is characterized in that: also comprise a clamp winding, one end of described clamp winding links to each other with the end of the same name of described first transformer (T1), and an end of described resonant capacitance (Cr) is electrically connected with the mid point of described first clamping diode (D7) and second clamping diode (D8) by resonant inductance (Lr) and described clamp winding.
5, as three-level LLC resonance inverter as described in the claim 4, it is characterized in that: also comprise second magnetizing inductance (Lm2), second transformer (T2), second rectification circuit, former limit one end of described second transformer (T2) is connected with the former limit of described first transformer (T1), the other end is electrically connected with the mid point of described switching circuit (130), and described second magnetizing inductance (Lm2) is connected in parallel on the former limit of described second transformer (T2); One end of described second rectification circuit is connected in parallel on the secondary of described second transformer (T2), the other end is connected an end of output, the centre cap of described first transformer (T1) secondary and the other end that is connected output after the centre cap of second transformer (T2) secondary is in parallel.
6, as claim 1,2,4 or 5 three-level LLC resonance inverter as described in each, it is characterized in that: described rectification circuit is center-tap rectifier circuit or full bridge rectifier.
7, as claim 1,2,4 or 5 three-level LLC resonance inverter as described in each, it is characterized in that: also comprise filter capacitor (C), described filter capacitor (C) is connected in parallel on output.
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| CNA200710073867XA CN101047337A (en) | 2007-04-12 | 2007-04-12 | Three-level LLC resonance inverter |
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| CNA200710073867XA CN101047337A (en) | 2007-04-12 | 2007-04-12 | Three-level LLC resonance inverter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857103A (en) * | 2011-06-30 | 2013-01-02 | 艾默生网络能源系统北美公司 | Three-level LLC (Logical Link Control) direct-current converter and control method thereof |
| CN101931316B (en) * | 2009-06-22 | 2013-03-06 | 力博特公司 | LLC (Liquid Level Control) topology and current limiting circuit thereof |
| CN106451364A (en) * | 2016-06-29 | 2017-02-22 | 江苏镇安电力设备有限公司 | Over-current protection circuit for full-bridge LLC resonance converter |
| CN107070242A (en) * | 2017-06-12 | 2017-08-18 | 天津职业技术师范大学 | A kind of dual transformer parallel-connection structure resonant type soft-switch DC converter |
| CN110474550A (en) * | 2019-08-21 | 2019-11-19 | 阳光电源股份有限公司 | A kind of striding capacitance type NPC three-level topology |
| CN112865538A (en) * | 2021-01-15 | 2021-05-28 | 西南交通大学 | High-voltage-reduction-ratio dual-resonance three-level LLC resonant converter and control method thereof |
| CN113147447A (en) * | 2021-03-17 | 2021-07-23 | 北京动力源科技股份有限公司 | Multifunctional vehicle-mounted charging circuit for electric automobile |
-
2007
- 2007-04-12 CN CNA200710073867XA patent/CN101047337A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931316B (en) * | 2009-06-22 | 2013-03-06 | 力博特公司 | LLC (Liquid Level Control) topology and current limiting circuit thereof |
| CN102857103A (en) * | 2011-06-30 | 2013-01-02 | 艾默生网络能源系统北美公司 | Three-level LLC (Logical Link Control) direct-current converter and control method thereof |
| CN106451364A (en) * | 2016-06-29 | 2017-02-22 | 江苏镇安电力设备有限公司 | Over-current protection circuit for full-bridge LLC resonance converter |
| CN107070242A (en) * | 2017-06-12 | 2017-08-18 | 天津职业技术师范大学 | A kind of dual transformer parallel-connection structure resonant type soft-switch DC converter |
| CN110474550A (en) * | 2019-08-21 | 2019-11-19 | 阳光电源股份有限公司 | A kind of striding capacitance type NPC three-level topology |
| CN112865538A (en) * | 2021-01-15 | 2021-05-28 | 西南交通大学 | High-voltage-reduction-ratio dual-resonance three-level LLC resonant converter and control method thereof |
| CN113147447A (en) * | 2021-03-17 | 2021-07-23 | 北京动力源科技股份有限公司 | Multifunctional vehicle-mounted charging circuit for electric automobile |
| CN113147447B (en) * | 2021-03-17 | 2022-08-16 | 北京动力源科技股份有限公司 | Multifunctional vehicle-mounted charging circuit for electric automobile |
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