Asymmetric CLLC circuit

Abstract

An asymmetric CLLC circuit comprises a transformer module, a first rectification inversion module, a first resonance unit, a second resonance unit, a second rectification inversion module, a first auxiliary winding unit, a first switching unit, a second auxiliary winding unit and a second switching unit. The first auxiliary winding unit is connected with a first side winding of the transformer module, and the second auxiliary winding unit is connected with a second side winding of the transformer module; the first switching unit and the first rectification inversion module are used for connecting the first auxiliary winding unit and a first side winding of the transformer module in series in a first mode; and the second switching module and the second rectification inversion module are used for connecting the second auxiliary winding unit and a second side winding of the transformer module in series in a second mode. By implementing the asymmetric CLLC circuit, the switching loss can be effectively reduced, and the overall efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to DCDC converter circuit, more particularly, relate to an asymmetric CLLC circuit. BACKGROUND

[0002] In the charging station, the PFC circuit and the battery are DC-DC part, usually need to be isolated, and the CLLC circuit is a kind of currently popular bidirectional DC-DC topology.CLLC circuit can achieve very ideal working condition when in the vicinity of optimum working point, and then get very high operating efficiency.However, in the case where the DC voltage of both sides varies in a wide range, its light load efficiency is very poor, especially when the input is the highest voltage and the output is the lowest voltage light load or even no load, the circuit works in non-soft switching state, at this time, the working frequency is at the highest frequency state, and the switching loss becomes higher, so that the overall efficiency is very low. SUMMARY

[0003] The utility model provides a kind of asymmetric CLLC circuit to solve the technical problems of prior art, by in transformer module different side in different working conditions Auxiliary winding unit is inserted, switching loss can be effectively reduced, and overall efficiency is improved.

[0004] The utility model discloses a kind of asymmetric CLLC circuits to solve its technical problems, and the technical scheme is: a kind of asymmetric CLLC circuit is structured, including transformer module, first rectifier inverter module and first resonant unit being arranged at the first side of the transformer module, and second resonant unit and second rectifier inverter module being arranged at the second side of the transformer module;

[0005] The asymmetric CLLC circuit further includes first auxiliary winding unit, first switching unit, second auxiliary winding unit and second switching unit;The first auxiliary winding unit is connected with the first side winding of the transformer module, and the second auxiliary winding unit is connected with the second side winding of the transformer module;The first switching unit and the first rectifier inverter module are used to connect the first auxiliary winding unit and the first side winding of the transformer module in series in first mode, and the second switching module and the second rectifier inverter module are used to connect the second auxiliary winding unit and the second side winding of the transformer module in series in second mode.

[0006] In the asymmetric CLLC circuit described in the utility model, the first rectifier inverter module includes first switch tube, second switch tube, third switch tube, fourth switch tube;The first switching unit includes fifth switch tube and sixth switch tube;

[0007] The control ends of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube receive control signals;

[0008] The first end of the first switch tube is connected with the second end of the second switch tube, the first end of the third switch tube is connected with the second end of the fourth switch tube, and the first end of the fifth switch tube is connected with the second end of the sixth switch tube; the second ends of the first switch tube, the third switch tube and the fifth switch tube are connected with the first positive electrode of the first power supply; and the first ends of the second switch tube, the fourth switch tube and the sixth switch tube are connected with the analog ground.

[0009] The first end of the first side winding of the transformer module is connected with the first end of the first switch tube and the second end of the second switch tube through the first resonance unit, and the second end of the first side winding of the transformer module is connected with the first end of the third switch tube, the second end of the fourth switch tube and the first end of the first auxiliary winding; and the second end of the first auxiliary winding is connected with the first end of the fifth switch tube and the second end of the sixth switch tube.

[0010] In the first mode, the third switch tube and the fourth switch tube are disabled, and the fifth switch tube and the sixth switch tube are turned on to connect the first auxiliary winding unit and the first side winding of the transformer module in series.

[0011] In the asymmetric CLLC circuit, the resonance unit comprises a first resonance capacitor and a resonance inductor connected in series.

[0012] In the asymmetric CLLC circuit, further comprising a first filter module, the first end of the first filter module is connected with the first positive electrode of the first power supply, and the second end of the first filter module is connected with the analog ground.

[0013] In the asymmetric CLLC circuit, the second rectifier inversion module comprises a seventh switch tube, an eighth switch tube, a ninth switch tube and a tenth switch tube; and the second switching unit comprises an eleventh switch tube and a twelfth switch tube.

[0014] The control ends of the seventh switch tube, the eighth switch tube, the ninth switch tube, the tenth switch tube, the eleventh switch tube and the twelfth switch tube receive control signals.

[0015] The first end of the seventh switch transistor is connected to the second end of the eighth switch transistor, the first end of the ninth switch transistor is connected to the second end of the tenth switch transistor, and the first end of the eleventh switch transistor is connected to the second end of the twelfth switch transistor; the second ends of the seventh, ninth, and eleventh switch transistors are connected to the positive electrode of the second power supply; and the first ends of the eighth, tenth, and twelfth switch transistors are connected to the analog ground.

[0016] The first end of the second-side winding of the transformer module is connected to the first end of the seventh switching tube and the second end of the eighth switching tube via the second resonant unit; the second end of the second-side winding of the transformer module is connected to the first end of the ninth switching tube, the second end of the tenth switching tube, and the first end of the second auxiliary winding; the second end of the second auxiliary winding is connected to the first end of the eleventh switching tube and the second end of the twelfth switching tube;

[0017] In the second mode, the ninth switch and the tenth switch are disabled, and the eleventh switch and the twelfth switch are enabled to connect the second auxiliary winding unit and the second side winding of the transformer module in series.

[0018] In the asymmetric CLLC circuit described in the present invention, the second resonant unit includes a second resonant capacitor.

[0019] In the asymmetric CLLC circuit described in the present invention, the switch tube includes a MOS tube, an IGBT tube or a triode.

[0020] The asymmetric CLLC circuit of the present invention further includes a first filtering module, wherein a first end of the first filtering module is connected to the first voltage positive electrode, and a second end of the first filtering module is connected to the analog ground.

[0021] The asymmetric CLLC circuit of the present invention further includes a second filtering module, wherein a first end of the second filtering module is connected to the positive electrode of the second power supply, and a second end of the second filtering module is connected to the analog ground.

[0022] The asymmetric CLLC circuit of the present invention is implemented by providing a first auxiliary winding unit, a first switching unit, a second auxiliary winding unit, and a second switching unit, and switching the first or second auxiliary winding unit on different sides of the transformer module under different working conditions. Therefore, the impedance on different sides of the transformer module can be increased and the excitation current can be reduced, thereby effectively reducing switching losses and improving overall efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1is the principle block diagram of the preferred embodiment of the asymmetric CLLC circuit of the utility model;

[0025] Figure 2 is the circuit diagram of the preferred embodiment of the asymmetric CLLC circuit of the utility model;

[0026] Figure 3 is the circuit diagram of the symmetric CLLC circuit;

[0027] Figure 4 is Figure 3 is the equivalent circuit diagram of the symmetric CLLC circuit shown in the figure;

[0028] Figure 5 is Figure 2 is the equivalent circuit diagram of the asymmetric CLLC circuit in the charging mode shown in the figure;

[0029] Figure 6 is Figure 2 is the equivalent circuit diagram of the asymmetric CLLC circuit in the discharging mode shown in the figure; DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and examples.The specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0031] Figure 1 is the principle block diagram of the preferred embodiment of the asymmetric CLLC circuit of the utility model.As Figure 1 The asymmetric CLLC circuit of the utility model includes transformer module 50, first rectification inversion module 10 and first resonant unit 30 arranged on the first side of the transformer module 50, and second resonant unit 70 and second rectification inversion module 20 arranged on the second side of the transformer module 50.

[0032] As Figure 1 The asymmetric CLLC circuit further includes first auxiliary winding unit, first switching unit 41, second auxiliary winding unit and second switching unit 42; the first auxiliary winding unit is connected with the first side winding of the transformer module 50, and the second auxiliary winding unit is connected with the second side winding of the transformer module 50; the first switching unit 41 and the first rectification inversion module 10 are used to connect the first auxiliary winding unit and the first side winding of the transformer module 50 in series in the first mode, and the second switching module and the second rectification inversion module 20 are used to connect the second auxiliary winding unit and the second side winding of the transformer module 50 in series in the second mode.

[0033] In one preferred embodiment of the present application, the transformer module 50, the first rectifier-inverter module 10, the first resonant unit 30, the second resonant unit 70 and the second rectifier-inverter module 20 can be configured with reference to any known corresponding module or unit of a CLLC circuit in the art. The first rectifier-inverter module 10 and the second rectifier-inverter module 20 can employ any suitable rectifier-inverter module, such as a switching tube full-bridge rectifier-inverter module. For example, the transformer module 50 can include one or more series transformers. The first resonant unit 30 and the second resonant unit 70 can employ any known resonant unit in the art, such as an LC resonant unit, an LRC resonant unit. In one preferred embodiment of the present application, the first resonant unit 30 can include a resonant capacitor and a resonant inductor in series, and the second resonant unit 70 can include only a resonant capacitor and utilize the leakage inductance of the transformer module as the resonant inductor. Similarly, the first resonant unit 30 can also include only a resonant capacitor, and the second resonant unit 70 includes a resonant capacitor and a resonant inductor in series.

[0034] In Figure 1 In the preferred embodiment shown, the asymmetric CLLC circuit further includes a first filter module 60 and a second filter module 80 to achieve the filtering function on both sides of the transformer module. The first filter module 60 is disposed between the first power supply end and the first rectifier-inverter module 10, and the second filter module 80 is disposed between the second power supply end and the second rectifier-inverter module 20. The first filter module 60 and the second filter module 80 can include at least one filter capacitor to achieve the filtering function.

[0035] In one preferred embodiment of the present application, as Figure 1 shown, the first auxiliary winding unit and the second auxiliary winding unit can include auxiliary windings Lm_p' and Lm_s', respectively. Of course, in other preferred embodiments of the present application, each auxiliary winding unit can include two or more auxiliary windings in series or in parallel.

[0036] In one preferred embodiment of the present application, the first switching unit 41 and the second switching unit 42 are preferably configured as switching tube half-bridge that can be controlled in coordination with the first rectifier-inverter module 10 and the second rectifier-inverter module 20, respectively.

[0037] In the first mode, such as the charging mode from the first side to the second side of the transformer module 50, the first switching unit 41 and the first rectification inversion module 10 are used to connect the first auxiliary winding unit in series to the first side winding of the transformer module 50. In this way, the first side winding of the transformer module 50 and the first auxiliary winding unit are connected in series. Since the second power supply of the second side of the transformer module 50 is inversely proportional to the working efficiency, after the first auxiliary winding unit is connected, when the second side of the transformer module 50 becomes light, it is no longer necessary to increase the working frequency, so the working frequency can be kept unchanged or even reduced, thereby reducing the switching loss, and at the same time, since the first auxiliary winding unit is connected in series, in the case that the first power supply is unchanged and the first side is in no-load state, the impedance of the second side of the transformer module 50 increases, so the excitation current of the second side becomes smaller, thereby improving the efficiency.

[0038] Similarly, in the second mode, such as the discharging mode from the second side to the first side of the transformer module 50, the second switching unit and the second rectification inversion module 20 are used to connect the second auxiliary winding unit in series to the second side winding of the transformer module 50 in the second mode. In this way, the second side winding of the transformer module 50 and the second auxiliary winding unit are connected in series. Since the first power supply of the first side of the transformer module 50 is inversely proportional to the working efficiency, after the second auxiliary winding unit is connected, when the first side of the transformer module 50 becomes light, it is no longer necessary to increase the working frequency, so the working frequency can be kept unchanged or even reduced, thereby reducing the switching loss, and at the same time, since the second auxiliary winding unit is connected in series, in the case that the second power supply is unchanged and the first side is in no-load state, the impedance of the second side of the transformer module 50 increases, so the excitation current of the second side becomes smaller, thereby improving the efficiency.

[0039] Therefore, the asymmetric CLLC circuit of the utility model, by setting the first auxiliary winding unit, the first switching unit, the second auxiliary winding unit and the second switching unit, and connecting the first or second auxiliary winding unit in the different side of the transformer module in different working states, so that the impedance of the different side of the transformer module increases, the excitation current becomes smaller, thereby effectively reducing the switching loss and improving the overall efficiency.

[0040] Figure 2 It is the circuit diagram of the preferred embodiment of the asymmetric CLLC circuit of the utility model. Figure 4 It is Figure 2 The equivalent circuit diagram of the asymmetric CLLC circuit shown in the charging mode. Figure 5 It is Figure 2 The equivalent circuit diagram of the asymmetric CLLC circuit shown in the discharging mode. The asymmetric CLLC circuit of the utility model will be described as follows. Figures 1-5 The asymmetric CLLC circuit of the utility model will be described as follows.

[0041] Combine Figure 1 It can be seen that the asymmetric CLLC circuit of the present invention includes a transformer module 50, a first filter module 60, a first rectifier inverter module 10, and a first resonant unit 30 arranged on a first side of the transformer module 50, a second resonant unit 70, a second rectifier inverter module 20 and a second filter module 80 arranged on a second side of the transformer module 50, as well as a first auxiliary winding unit, a first switching unit 41, a second auxiliary winding unit and a second switching unit 42.

[0042] Further Figure 2 As shown, the transformer module 50 includes at least a transformer Tx; the first filter module 60 includes a filter capacitor C3; the first rectifier inverter module 10 includes a switch tube M1, a switch tube M2, a switch tube M3, and a switch tube M4; the first switching unit 41 includes a switch tube M9 and a switch tube M10; and the second resonant unit 70 includes a resonant capacitor Cs. The first resonant unit 30 includes a resonant capacitor Cp and a resonant inductor Lr connected in series with each other. The second rectifier inverter module 20 includes a switch tube M5, a switch tube M6, a switch tube M7, and a switch tube M8; the second switching unit 42 includes a switch tube M11 and a switch tube M12. The second filter module 80 includes a filter capacitor C4. The first auxiliary winding unit and the second auxiliary winding unit can respectively include auxiliary windings Lm_p' and Lm_s'.

[0043] like Figure 2 As shown, the first end of the filter capacitor C3 is connected to the positive power supply electrode V2+, and the second end is connected to the analog ground. The control ends of the switches M1, M2, M3, M4, M9, and M10 receive control signals. The first end of the switch M1 is connected to the second end of the switch M3, the first end of the switch M2 is connected to the second end of the switch M4, and the first end of the switch M9 is connected to the second end of the switch M10. The second ends of the switches M1, M2, and M9 are connected to the positive power supply electrode V2+. The first ends of the switches M3, M4, and M10 are connected to the analog ground ANG.

[0044] The first end of the first side winding Lm_p of the transformer Tx is connected with the first end of the switch tube M1 and the second end of the switch tube M3 in sequence through the resonance inductor Lr and the resonance capacitor Cp, the second end of the first side winding Lm_p of the transformer Tx is connected with the first end of the switch tube M2, the second end of the switch tube M4 and the first end of the first auxiliary winding Lm_p'; the second end of the first auxiliary winding Lm_p' is connected with the first end of the switch tube M9 and the second end of the switch tube M10; the control ends of the switch tube M5, the switch tube M7, the switch tube M6, the switch tube M8, the switch tube M11 and the switch tube M12 receive control signals.

[0045] The first end of the switch tube M5 is connected with the second end of the switch tube M7, the first end of the switch tube M6 is connected with the second end of the switch tube M8, and the first end of the switch tube M11 is connected with the second end of the switch tube M12; the second ends of the switch tube M5, the switch tube M6 and the switch tube M11 are connected with the positive pole of the second power supply; the first ends of the switch tube M7, the switch tube M8 and the switch tube M12 are connected with the analog ground;

[0046] The first end of the second side winding Lm_s of the transformer Tx is connected with the first end of the switch tube M5 and the second end of the switch tube M7 through the resonance capacitor Cs, and the second end of the second side winding Lm_s of the transformer Tx is connected with the first end of the switch tube M6, the second end of the switch tube M8 and the first end of the second auxiliary winding Lm_s'; the second end of the second auxiliary winding Lm_s' is connected with the first end of the switch tube M11 and the second end of the switch tube M12.

[0047] In the first mode, the switch tube M2 and the switch tube M4 are disabled, and the switch tube M9 and the switch tube M10 are turned on to put the first auxiliary winding unit in series into the first side winding of the transformer Tx; in the second mode, the switch tube M6 and the switch tube M8 are disabled, and the switch tube M11 and the switch tube M12 are turned on to put the second auxiliary winding unit in series into the second side winding of the transformer Tx.

[0048] In a preferred embodiment of the utility model, the switch tube M1-M12 can include MOS tube, IGBT tube or triode. When the switch tube M1-M12 is MOS tube or IGBT tube, the control end of the switch tube M1-M12 is the gate of MOS tube or IGBT tube, the first end is the source of MOS tube or IGBT tube, and the second end is the drain of MOS tube or IGBT tube. When the switch tube M1-M12 is triode, the control end of the switch tube M1-M12 is the base of triode, the first end is the emitter of triode, and the second end is the drain of triode.

[0049] Figure 3 is a circuit diagram of a symmetric CLLC circuit. Figure 4 is Figure 3 is an equivalent circuit diagram of the symmetric CLLC circuit shown in Figure 5 is Figure 2 is an equivalent circuit diagram of the asymmetric CLLC circuit shown in Figure 6 is Figure 2 is an equivalent circuit diagram of the asymmetric CLLC circuit shown in Figures 2-5 The principle of the asymmetric CLLC circuit of the utility model is explained as follows. It is assumed that the turns ratio of the primary side (Vbus side) and the secondary side (Vbat side) of the transformer is n. According to the principle of fundamental wave equivalence and impedance voltage division, for the symmetric CLLC circuit shown in Figure 3 , the impedance relationship of charging / discharging is equivalent to Figure 4 , the relationship between the equivalent capacitance resistance value Cs' and the resistance value of the resonance capacitance Cs in the figure is as follows: Figure 2

[0050]

[0051] We define the ratio of the equivalent capacitance resistance value Cs' and the resonance capacitance Cp as g, and there are two resonance frequencies when the circuit works. When the primary winding Lm_p of the transformer does not participate in resonance, the resonance frequency of the circuit is obtained:

[0052]

[0053] Wherein Lr represents the inductance value of the resonance inductance Lr, and Cp represents the capacitance value of the resonance capacitance Cp.

[0054] When the primary winding Lm_p of the transformer participates in resonance, the resonance frequency of the circuit is obtained:

[0055]

[0056] Similarly, according to Figure 5 , the transfer function of the charging input and output of the asymmetric CLLC circuit of the utility model in the charging mode can be simplified to formula 1, and according to Figure 6 , the transfer function of the discharging input and output of the asymmetric CLLC circuit of the utility model in the charging mode can be simplified to formula 2.

[0057]

[0058] ​In the formulas 1 and 2, Lr represents the inductance value of the resonance inductance Lr, Cp represents the capacitance value of the resonance capacitance Cp, Lmp represents the inductance value of the primary winding Lm_p, Req_bat represents the equivalent resistance of the bat end, Req_bus represents the equivalent resistance of the bus end, ω represents the angular frequency, and jω represents the phase margin.

[0059] Therefore, In the interval, Vbat and the frequency f are in a monotonically decreasing relationship; in In the interval, Vbus and the frequency f are in a monotonically decreasing relationship.

[0060] In the interval , we call it the inductive working zone, and thus according to the foregoing charging impedance relationship, when the load Req becomes smaller, the output voltage is equivalent to being smaller, that is, the switching frequency needs to be increased. Therefore, in the utility model, the MOS tubes M2 and M4 can be controlled to be disabled, and the MOS tubes M9 and M10 are enabled, so as to connect the auxiliary winding Lm_p' and the first side winding Lm_p of the transformer Tx in series (see Figure 4 ). It is equivalent to connecting an auxiliary winding Lm_p' in series in the impedance network of the first side of the transformer Tx. Meanwhile, according to the input-output function relationship, it is known that the second side power Vbat and the working frequency are in an inverse ratio, that is, after the auxiliary winding Lm_p' is connected, when the load becomes lighter, the working frequency does not need to be increased, and the working frequency can be kept unchanged, or even the working frequency needs to be reduced, so as to achieve the purpose of reducing the switching loss. On the other hand, because the auxiliary winding Lm_p' is connected in series, when the first side power Vbus is unchanged, under the output no-load condition, because the impedance of the main circuit network increases, the excitation current I_Lm also becomes smaller, and the purpose of improving the efficiency is achieved. Similarly, during discharging, the MOS tubes M5 and M7 are disabled, and the MOS tubes M11 and M12 are enabled, so as to connect the auxiliary winding Lm_s' and the second side winding Lm_s of the transformer Tx in series (see Figure 5 ). Meanwhile, according to the input-output function relationship, it is known that the first side power Vbus and the working frequency are in an inverse ratio, that is, after the auxiliary winding Lm_s' is connected, when the load becomes lighter, the working frequency does not need to be increased, and the working frequency can be kept unchanged, or even the working frequency needs to be reduced, so as to achieve the purpose of reducing the switching loss. On the other hand, because the auxiliary winding Lm_s' is connected in series, when the second side power Vbat is unchanged, under the output no-load condition, because the impedance of the main circuit network increases, the excitation current I_Ls also becomes smaller, and the purpose of improving the efficiency is achieved again.

[0061] Although the utility model is through the specific embodiment to explain, the person skilled in the art should understand that, without departing from the scope of the utility model, still can make various transformations and equivalent replacement to the utility model. In addition, for specific situation or material, can make various modifications to the utility model, and do not depart from the scope of the utility model. Therefore, the utility model is not limited to the disclosed specific embodiments, and should include all the embodiments falling within the scope of the claims of the utility model.

[0062] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An asymmetric CLLC circuit, comprising a transformer module, a first rectifier-inverter module and a first resonant unit arranged on a first side of the transformer module, and a second resonant unit and a second rectifier-inverter module arranged on a second side of the transformer module. It is characterized by: The asymmetric CLLC circuit further includes a first auxiliary winding unit, a first switching unit, a second auxiliary winding unit and a second switching unit; the first auxiliary winding unit is connected to the first side winding of the transformer module, and the second auxiliary winding unit is connected to the second side winding of the transformer module; the first switching unit and the first rectifier inverter module are used to connect the first auxiliary winding unit and the first side winding of the transformer module in series in the first mode, and the second switching unit and the second rectifier inverter module are used to connect the second auxiliary winding unit and the second side winding of the transformer module in series in the second mode.

2. The asymmetric CLLC circuit according to claim 1, wherein: The first rectifier inverter module includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch tube; the first switching unit includes a fifth switch tube and a sixth switch tube; Control terminals of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube receive a control signal; The first end of the first switching transistor is connected to the second end of the second switching transistor, the first end of the third switching transistor is connected to the second end of the fourth switching transistor, and the first end of the fifth switching transistor is connected to the second end of the sixth switching transistor; the second ends of the first switching transistor, the third switching transistor, and the fifth switching transistor are connected to the positive electrode of the first power supply; and the first ends of the second switching transistor, the fourth switching transistor, and the sixth switching transistor are connected to the analog ground; The first end of the first-side winding of the transformer module is connected to the first end of the first switching tube and the second end of the second switching tube via the first resonant unit; the second end of the first-side winding of the transformer module is connected to the first end of the third switching tube, the second end of the fourth switching tube, and the first end of the first auxiliary winding; the second end of the first auxiliary winding is connected to the first end of the fifth switching tube and the second end of the sixth switching tube; In the first mode, the third switch and the fourth switch are disabled, and the fifth switch and the sixth switch are enabled to connect the first auxiliary winding unit and the first side winding of the transformer module in series.

3. The asymmetric CLLC circuit according to claim 2, characterized in that: The resonance unit includes a first resonance capacitor and a resonance inductor connected in series.

4. The asymmetric CLLC circuit according to claim 2, wherein: It further includes a first filtering module, wherein a first end of the first filtering module is connected to the positive electrode of the first power supply, and a second end of the first filtering module is connected to the analog ground.

5. The asymmetric CLLC circuit according to any one of claims 1 to 4, characterized in that: The second rectifier inverter module includes a seventh switch tube, an eighth switch tube, a ninth switch tube, and a tenth switch tube; the second switching unit includes an eleventh switch tube and a twelfth switch tube; Control terminals of the seventh switch tube, the eighth switch tube, the ninth switch tube, the tenth switch tube, the eleventh switch tube, and the twelfth switch tube receive a control signal; The first end of the seventh switch transistor is connected to the second end of the eighth switch transistor, the first end of the ninth switch transistor is connected to the second end of the tenth switch transistor, and the first end of the eleventh switch transistor is connected to the second end of the twelfth switch transistor; the second ends of the seventh, ninth, and eleventh switch transistors are connected to the positive electrode of the second power supply; and the first ends of the eighth, tenth, and twelfth switch transistors are connected to the analog ground. The first end of the second-side winding of the transformer module is connected to the first end of the seventh switching tube and the second end of the eighth switching tube via the second resonant unit; the second end of the second-side winding of the transformer module is connected to the first end of the ninth switching tube, the second end of the tenth switching tube, and the first end of the second auxiliary winding; the second end of the second auxiliary winding is connected to the first end of the eleventh switching tube and the second end of the twelfth switching tube; In the second mode, the ninth switch and the tenth switch are disabled, and the eleventh switch and the twelfth switch are enabled to connect the second auxiliary winding unit and the second side winding of the transformer module in series.

6. The asymmetric CLLC circuit according to claim 5, characterized in that: The second resonant unit includes a second resonant capacitor.

7. The asymmetric CLLC circuit according to claim 5, characterized in that: The switch tube includes a MOS tube, an IGBT tube or a triode.

8. The asymmetric CLLC circuit according to claim 5, wherein: It further includes a first filtering module, wherein a first end of the first filtering module is connected to the positive pole of the first power supply, and a second end of the first filtering module is connected to the analog ground.

9. The asymmetric CLLC circuit according to claim 5, characterized in that: It further includes a second filtering module, wherein a first end of the second filtering module is connected to the positive electrode of the second power supply, and a second end of the second filtering module is connected to the analog ground.

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