A full-bridge LLC resonant converter circuit

Abstract

The utility model discloses a full-bridge LLC resonant converter circuit, including: a first half-bridge circuit, a second half-bridge circuit, a third half-bridge circuit, a fourth half-bridge circuit and a third inductor, wherein the output end of the first half-bridge circuit is connected to one end of the first capacitor; the output end of the second half-bridge circuit is connected to one end of the first inductor; the output end of the third half-bridge circuit is connected to one end of the second capacitor; the output end of the fourth half-bridge circuit is connected to one end of the second inductor; one end of the third inductor is connected to the other end of the first capacitor and the other end of the second capacitor; the other end of the third inductor is connected to the other end of the first inductor and the other end of the second inductor. The third inductor is the excitation inductor of the first LLC resonant converter circuit; the third inductor is also the primary inductor of the first transformer. Through the LLC resonant converter circuit provided by this embodiment, the power multiple output is realized in the primary circuit of the transformer.

Description

Technical Field

[0001] The utility model relates to the technical field of resonant converters, in particular to a full-bridge LLC resonant converter circuit. Background Art

[0002] The LLC resonant converter is a resonant converter with three reactive elements. It converts the DC input voltage into a square wave through a half-bridge or full-bridge switching network and inputs it into a resonant tank circuit to effectively filter out harmonics and provide sinusoidal voltage and current waveforms.

[0003] With the development of new energy vehicles, the demand for high-power DC output scenarios is gradually increasing. The output power of existing voltage sources and LLC resonant converters and transformers is insufficient to meet today's market demand. Therefore, how to increase the output power of voltage sources has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides a full-bridge LLC resonant converter circuit to solve the problems in the prior art.

[0005] The present invention provides a full-bridge LLC resonant converter circuit, comprising:

[0006] a first half-bridge circuit, an output end of which is connected to one end of a first capacitor;

[0007] a second half-bridge circuit, an output end of which is connected to one end of the first inductor;

[0008] a third half-bridge circuit, an output end of which is connected to one end of the second capacitor;

[0009] a fourth half-bridge circuit, an output end of which is connected to one end of the second inductor;

[0010] a third inductor, one end of which is connected to the other end of the first capacitor and the other end of the second capacitor; and the other end of the third inductor is connected to the other end of the first inductor and the other end of the second inductor;

[0011] In which, the input end of the first half-bridge circuit and the input end of the second half-bridge circuit are connected to the first voltage source; the input end of the third half-bridge circuit and the input end of the fourth half-bridge circuit are connected to the second voltage source; the amplitude and phase of the first voltage source and the second voltage source are consistent; the third inductor is the excitation inductor of the first LLC resonant converter circuit; and the third inductor is also the primary inductor of the first transformer.

[0012] Optionally, the first voltage source and the second voltage source are the same voltage source.

[0013] Optionally, it also includes:

[0014] a fifth half-bridge circuit, an output end of which is connected to one end of the third capacitor;

[0015] a sixth half-bridge circuit, an output end of which is connected to one end of the fourth inductor;

[0016] Among them, the other end of the third capacitor is connected to the other end of the first capacitor and the other end of the second capacitor; the other end of the fourth inductor is connected to the other end of the first inductor and the other end of the third inductor; one end of the third inductor is connected to the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor; the other end of the third inductor is connected to the other end of the first inductor, the other end of the second inductor and the other end of the fourth inductor; the input end of the fifth half-bridge circuit and the input end of the sixth half-bridge circuit are connected to the third voltage source; the amplitude and phase of the first voltage source, the second voltage source and the third voltage source are consistent.

[0017] Optionally, the first voltage source and / or the second voltage source and the third voltage source are the same voltage source.

[0018] Optionally, the first voltage source and the second voltage source are obtained by outputting the same three-phase power supply through a Vienna rectifier circuit; wherein, after rectification by the Vienna rectifier circuit, a first potential output terminal of NV, a second potential output terminal of 0V and a third potential output terminal of -NV are obtained.

[0019] Optionally, two ends of the first voltage source and / or the second voltage source are respectively a first potential output end and a third potential output end.

[0020] Optionally, it also includes:

[0021] a seventh half-bridge circuit, an output end of which is connected to one end of a fourth capacitor;

[0022] an eighth half-bridge circuit, an output end of which is connected to one end of the fifth inductor;

[0023] a ninth half-bridge circuit, an output end of which is connected to one end of the fifth capacitor;

[0024] a tenth half-bridge circuit, an output end of which is connected to one end of a sixth inductor;

[0025] a seventh inductor, one end of which is connected to the other end of the fourth capacitor and the other end of the fifth capacitor; the other end of the seventh inductor is connected to the other end of the fifth inductor and the other end of the sixth inductor;

[0026] Among them, the input end of the seventh half-bridge circuit and the input end of the eighth half-bridge circuit are connected to the fourth voltage source; the input end of the ninth half-bridge circuit and the input end of the tenth half-bridge circuit are connected to the fifth voltage source; the amplitude and phase of the fourth voltage source and the fifth voltage source are consistent; the seventh inductor is the excitation inductor of the second LLC resonant converter circuit; the seventh inductor is also the primary inductor of the second transformer; the secondary inductor of the first transformer is connected in parallel with the secondary inductor of the second transformer.

[0027] Optionally, two ends of the first voltage source and the second voltage source are respectively the first potential output end and the second potential output end; two ends of the fourth voltage source and the fifth voltage source are respectively the second potential output end and the third potential output end.

[0028] Optionally, the first half-bridge circuit includes:

[0029] A first MOS transistor, whose source and drain are connected in parallel with the first parasitic diode;

[0030] a second MOS transistor, a source and a drain of which are connected in parallel with a second parasitic diode;

[0031] Among them, the drain of the first MOS tube is connected to the source of the second MOS tube; the source of the first MOS tube is the first voltage input end of the first half-bridge circuit; the drain of the second MOS tube is the second voltage input end of the first half-bridge circuit; the drain of the first MOS tube is the output end of the first half-bridge circuit.

[0032] Optionally, it also includes:

[0033] The filter circuit is connected in parallel at both ends of the first voltage source and the second voltage source; the filter circuit is composed of a plurality of capacitors connected in parallel.

[0034] Beneficial effects of the utility model:

[0035] 1. This embodiment provides a full-bridge LLC resonant converter circuit that integrates two full-bridge LLC resonant converter circuits on the primary side of a transformer. Because the input voltage sources have the same amplitude and phase, no additional modulation circuit or control method is required. This allows for double the power input on the primary side of the transformer, resulting in a power output at the secondary side of the transformer, meeting various production and application requirements.

[0036] 2. This embodiment provides a full-bridge LLC resonant converter circuit that achieves multiple outputs by expanding multiple half-bridge circuits on the primary side.

[0037] 3. This embodiment provides a full-bridge LLC resonant converter circuit, which performs rectification at the three-phase power supply end through a Vienna rectifier circuit to obtain a neutral point potential, and divides the three-phase power supply output into two voltage sources with the same amplitude and opposite phase. A full-bridge LLC resonant converter circuit is then connected to each of the two voltage sources, which are then connected in parallel on the secondary side of the transformer to obtain a power output multiplier of the transformer secondary side power. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0039] Figure 1 The structure diagram of a full-bridge LLC resonant converter circuit in an embodiment of the present utility model is shown;

[0040] Figure 2 The structure diagram of another full-bridge LLC resonant converter circuit in an embodiment of the present utility model is shown;

[0041] Figure 3 The power supply end structure diagram of a full-bridge LLC resonant converter circuit in an embodiment of the present utility model is shown;

[0042] Figure 4 The structure diagram of another full-bridge LLC resonant converter circuit in an embodiment of the present utility model is shown;

[0043] Figure 5 The following is a circuit diagram showing a two-way full-bridge LLC resonant converter circuit based on the same amplitude but different phase input and output in parallel on the secondary side of the transformer according to an embodiment of the present invention;

[0044] Description of reference numerals:

[0045] Q11_1, Q11_2, Q12_1, Q12_2, Q21_1, Q21_2, Q22_1, Q22_2, Q31_1, Q31_2, Q3 2_1, Q32_2, Q41_1, Q41_2, Q42_1, Q42_2, Q51_1, Q51_2, Q52_1, Q52_2: MOS tube;

[0046] Q1, Q2, Q5, Q6, Q9, Q10: transistors;

[0047] D11_1, D11_2, D12_1, D12_2, D21_1, D21_2, D22_1, D22_2, D31_1, D31_2, D32_1, D32_2, D41_1, D41_2, D42_1, D42_2, D51_1, D51_2, D52_1, D52_2: parasitic diodes;

[0048] D1, D2, D3, D4, D5, D6, D7, D8, D9, D10: diodes;

[0049] C1, C2, C3, C4, C5, C6: capacitors;

[0050] T1, T2: transformers. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0052] The present invention provides a full-bridge LLC resonant converter circuit, comprising: a first half-bridge circuit, a second half-bridge circuit, a third half-bridge circuit, a fourth half-bridge circuit, and a third inductor, wherein the output end of the first half-bridge circuit is connected to one end of the first capacitor; the output end of the second half-bridge circuit is connected to one end of the first inductor; the output end of the third half-bridge circuit is connected to one end of the second capacitor; the output end of the fourth half-bridge circuit is connected to one end of the second inductor; one end of the third inductor is connected to the other end of the first capacitor and the other end of the second capacitor; the other end of the third inductor is connected to the other end of the first inductor and the other end of the second inductor. The input end of the first half-bridge circuit and the input end of the second half-bridge circuit are connected to a first voltage source; the input end of the third half-bridge circuit and the input end of the fourth half-bridge circuit are connected to a second voltage source; the amplitude and phase of the first voltage source and the second voltage source are consistent; the third inductor is the excitation inductor of the first LLC resonant converter circuit; and the third inductor is also the primary inductor of the first transformer.

[0053] like Figure 1 As shown, in this embodiment, taking the first half-bridge circuit as an example, its circuit structure includes a first MOS transistor Q11_1, a first parasitic diode D11_1, a second MOS transistor Q11_2, and a second parasitic diode D11_2. The source and drain of the first MOS transistor Q11_1 are connected in parallel with the first parasitic diode D11_1; the source and drain of the second MOS transistor Q11_2 are connected in parallel with the second parasitic diode D11_2. The drain of the first MOS transistor Q11_1 is connected to the source of the second MOS transistor Q11_2. The source of the first MOS transistor Q11_1 serves as a first voltage input terminal of the first half-bridge circuit; the drain of the second MOS transistor Q11_2 serves as a second voltage input terminal of the first half-bridge circuit; and the drain of the first MOS transistor Q11_1 serves as an output terminal of the first half-bridge circuit. Figures 1 to 3 The base of the transistor and the gate of the MOS tube are connected to the corresponding control signal source. Figure 3 The emitters of the two transistors are grounded.

[0054] The output of the first half-bridge circuit is connected to one end of the first capacitor Cr1, the output of the second half-bridge circuit is connected to one end of the first inductor Lr1, the output of the third half-bridge circuit is connected to one end of the second capacitor Cr2, and the output of the fourth half-bridge circuit is connected to one end of the second inductor Lr2. The other ends of the first capacitor Cr1 and the second capacitor Cr2 are connected together to one end of the third inductor Lm1. The other ends of the first inductor Lr1 and the second inductor Lr2 are connected together to the other end of the third inductor Lm1. The third inductor Lm1 serves as both the magnetizing inductor of the LLC resonant converter circuit and the primary inductor of the transformer.

[0055] In a specific implementation, a filter circuit is further included, which is connected in parallel between the first voltage source and the second voltage source; the filter circuit is composed of a plurality of capacitors connected in parallel.

[0056] This embodiment provides a full-bridge LLC resonant converter circuit that integrates two full-bridge LLC resonant converter circuits on the primary side of a transformer. Because the amplitude and phase of the input voltage source are the same, no additional modulation circuit or control method is required. Double power input can be achieved on the primary side of the transformer, thereby achieving double power output on the secondary side of the transformer, meeting various production and application needs.

[0057] For different input voltage sources, multiple voltage sources can be modulated to the same amplitude and phase, and high power output can be obtained through the full-bridge LLC resonant converter circuit in this embodiment.

[0058] like Figure 2 As shown, a fifth half-bridge circuit and a sixth half-bridge circuit can be further expanded, wherein the output end of the fifth half-bridge circuit is connected to one end of the third capacitor Cr3; the output end of the sixth half-bridge circuit is connected to one end of the fourth inductor Lr3; wherein the other end of the third capacitor Cr3 is connected to the other end of the first capacitor Cr1 and the other end of the second capacitor Cr2; the other end of the fourth inductor Lr3 is connected to the other end of the first inductor Lr1 and the other end of the third inductor Lr2; one end of the third inductor Lm1 is connected to the other end of the first capacitor Cr1, the other end of the second capacitor Cr2 and the other end of the third capacitor Cr3; the other end of the third inductor Lm1 is connected to the other end of the first inductor Lr1, the other end of the second inductor Lr2 and the other end of the fourth inductor Lr3; the input end of the fifth half-bridge circuit and the input end of the sixth half-bridge circuit are connected to the third voltage source; the amplitude and phase of the first voltage source, the second voltage source and the third voltage source are consistent.

[0059] In this embodiment, under the premise that the amplitude and phase of the input voltage source are consistent, multiple power output can be achieved by expanding a number of paired half-bridge circuits in the primary circuit of the transformer.

[0060] In a specific embodiment, the first voltage source and / or the second voltage source and the third voltage source are the same voltage source.

[0061] As an optional implementation, the first and second voltage sources are derived from a single three-phase power supply via a Vienna rectifier circuit. After rectification by the Vienna rectifier circuit, a first potential output terminal VBUS_P (NV), a second potential output terminal VBUS_M (0V), and a third potential output terminal VBUS_N (-NV) are obtained. In a specific embodiment, the first and / or second voltage sources each have a first potential output terminal and a third potential output terminal, respectively. The second potential output terminal is a neutral point potential.

[0062] In this embodiment, if Figure 3 As shown, the three-phase power supply is rectified using a Vienna circuit to generate a DC voltage source output. GA11_MOS and GA12_MOS are the drive signals for transistors Q1 and Q2, GB11_MOS and GB12_MOS are the drive signals for transistors Q5 and Q6, and GC11_MOS and GC12_MOS are the drive signals for transistors Q9 and Q10. S1A, S1B, and S1C represent ground.

[0063] As an optional implementation, it also includes:

[0064] a seventh half-bridge circuit, an output end of which is connected to one end of a fourth capacitor;

[0065] an eighth half-bridge circuit, an output end of which is connected to one end of the fifth inductor;

[0066] a ninth half-bridge circuit, an output end of which is connected to one end of the fifth capacitor;

[0067] a tenth half-bridge circuit, an output end of which is connected to one end of a sixth inductor;

[0068] a seventh inductor, one end of which is connected to the other end of the fourth capacitor and the other end of the fifth capacitor; the other end of the seventh inductor is connected to the other end of the fifth inductor and the other end of the sixth inductor;

[0069] Among them, the input end of the seventh half-bridge circuit and the input end of the eighth half-bridge circuit are connected to the fourth voltage source; the input end of the ninth half-bridge circuit and the input end of the tenth half-bridge circuit are connected to the fifth voltage source; the amplitude and phase of the fourth voltage source and the fifth voltage source are consistent; the seventh inductor is the excitation inductor of the second LLC resonant converter circuit; the seventh inductor is also the primary inductor of the second transformer; the secondary inductor of the first transformer is connected in parallel with the secondary inductor of the second transformer.

[0070] In this embodiment, if Figure 4 As shown, the structure of the second LLC resonant converter circuit is consistent with that of the first LLC resonant converter circuit, except that the input end is connected to a different voltage source.

[0071] In a specific embodiment, the front-end voltage input circuits of the first LLC resonant converter circuit and the second LLC resonant converter circuit are: Figure 3 In the power supply circuit, the two ends of the first voltage source and the second voltage source are respectively the first potential output end and the second potential output end; the two ends of the fourth voltage source and the fifth voltage source are respectively the second potential output end and the third potential output end.

[0072] The output voltage source of the first LLC resonant converter circuit is a voltage-divided power source of NV to 0V output by the three-phase power supply through the Vienna rectifier circuit. The output voltage source of the second LLC resonant converter circuit is another voltage-divided power source of 0V to -NV output by the three-phase power supply through the Vienna rectifier circuit. Since the two sets of voltages output by the Vienna rectifier circuit are inconsistent in phase but have the same amplitude, the two resonant converter circuits are connected in parallel on the secondary side of the transformer to achieve dead zone complementarity. Specifically, as Figure 5 As shown, AC signal 1 is a voltage-divided power supply output from the PM terminal of the Vienna rectifier circuit, which is then passed through the first LLC resonant converter circuit and then output. AC signal 2 is another voltage-divided power supply output from the MN terminal of the Vienna rectifier circuit, which is then passed through the second LLC resonant converter circuit and then output. AC signals 1 and 2 have the same amplitude and are staggered by 90 degrees. The secondary sides of the two transformers are rectified by the rectifier circuit and then connected in parallel to the load terminal, achieving double power output.

[0073] This embodiment provides a full-bridge LLC resonant converter circuit, which performs rectification at the three-phase power supply end through a Vienna rectifier circuit to obtain a neutral point potential, and divides the three-phase power supply output into two voltage sources with the same amplitude and opposite phase. A full-bridge LLC resonant converter circuit is then connected to each of the two voltage sources, which are then connected in parallel on the secondary side of the transformer to obtain a power output multiplier of the secondary side of the transformer.

[0074] like Figure 1 As shown, the MOS tube drive of the first LLC resonant converter circuit is described:

[0075] G11_UP_MOS is the epwm drive signal 1A sent by the DSP, and G11_DOWN_MOS is the epwm drive signal 1B sent by the DSP. The drive signals 1A and 1B are complementary and have a dead zone. The dead zone is set to prevent the bridge arm from being directly connected.

[0076] G12_UP_MOS is the epwm drive signal 2A sent by the DSP, and G12_DOWN_MOS is the epwm drive signal 2B sent by the DSP. The drive signals 2A and 2B are complementary and have a dead zone. The dead zone is set to prevent the bridge arm from being directly connected.

[0077] Drive signals 1A and 3A (G21_UP_MOS) share a common signal, drive signals 2A and 4A (G22_UP_MOS) share a common signal, drive signals 1B and 3B (G21_DOWM_MOS) share a common signal, and 2B and 4B (G22_DOWM_MOS) share a common signal.

[0078] like Figure 4 As shown, the MOS tube drive of the second LLC resonant converter circuit is described:

[0079] G41_UP_MOS is the epwm drive signal 5A sent by the DSP, and G41_DOWN_MOS is the epwm drive signal 5B sent by the DSP. The drive signals 5A and 5B are complementary and have a dead zone. The dead zone is set to prevent the bridge arm from being directly connected.

[0080] G42_UP_MOS is the epwm drive signal 6A sent by the DSP, and G42_DOWN_MOS is the epwm drive signal 6B sent by the DSP. The drive signals 6A and 6B are complementary and have a dead zone. The dead zone is set to prevent the bridge arm from being directly connected.

[0081] The driving signals 5A and 7A (G51_UP_MOS) share a common signal, the driving signals 6A and 8A (G52_UP_MOS) share a common signal, the driving signals 5B and 7B (G51_DOWM_MOS) share a common signal, and the driving signals 6B and 8B (G52_DOWM_MOS) share a common signal.

[0082] Drive signal 1A leads drive signal 5A by 90 degrees, drive signal 1B leads drive signal 5B by 90 degrees, drive signal 2A leads drive signal 6A by 90 degrees, drive signal 2B leads drive signal 6B by 90 degrees, and the phase of AC signal 1 leads the phase of AC signal 2 by 90 degrees.

[0083] In a specific embodiment, each half-bridge circuit generates a driving signal through an NSI6602 isolated half-bridge driver chip to drive the switching of two MOS tubes in the half-bridge circuit.

[0084] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A full-bridge LLC resonant converter circuit, characterized in that: include: A first half-bridge circuit, an output end of which is connected to one end of a first capacitor; A second half-bridge circuit, an output end of which is connected to one end of the first inductor; A third half-bridge circuit, an output end of which is connected to one end of the second capacitor; a fourth half-bridge circuit, an output end of which is connected to one end of the second inductor; a third inductor, one end of which is connected to the other end of the first capacitor and the other end of the second capacitor; the other end of the third inductor is connected to the other end of the first inductor and the other end of the second inductor; Among them, the input end of the first half-bridge circuit and the input end of the second half-bridge circuit are connected to the first voltage source; the input end of the third half-bridge circuit and the input end of the fourth half-bridge circuit are connected to the second voltage source; the amplitude and phase of the first voltage source and the second voltage source are consistent; the third inductor is the excitation inductor of the first LLC resonant converter circuit; the third inductor is also the primary inductor of the first transformer.

2. The full-bridge LLC resonant converter circuit according to claim 1, characterized in that: The first voltage source and the second voltage source are the same voltage source.

3. The full-bridge LLC resonant converter circuit according to claim 1, characterized in that: Also includes: a fifth half-bridge circuit, an output end of which is connected to one end of the third capacitor; a sixth half-bridge circuit, an output end of which is connected to one end of the fourth inductor; Among them, the other end of the third capacitor is connected to the other end of the first capacitor and the other end of the second capacitor; the other end of the fourth inductor is connected to the other end of the first inductor and the other end of the third inductor; one end of the third inductor is connected to the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor; the other end of the third inductor is connected to the other end of the first inductor, the other end of the second inductor and the other end of the fourth inductor; the input end of the fifth half-bridge circuit and the input end of the sixth half-bridge circuit are connected to the third voltage source; the amplitude and phase of the first voltage source, the second voltage source and the third voltage source are consistent.

4. The full-bridge LLC resonant converter circuit according to claim 3, characterized in that: The first voltage source and / or the second voltage source and the third voltage source are the same voltage source.

5. The full-bridge LLC resonant converter circuit according to claim 1, characterized in that: The first voltage source and the second voltage source are obtained by outputting the same three-phase power supply through a Vienna rectifier circuit; wherein, after rectification by the Vienna rectifier circuit, a first potential output terminal of NV, a second potential output terminal of 0V and a third potential output terminal of -NV are obtained.

6. The full-bridge LLC resonant converter circuit according to claim 5, characterized in that: Two ends of the first voltage source and / or the second voltage source are respectively the first potential output end and the third potential output end.

7. The full-bridge LLC resonant converter circuit according to claim 5, characterized in that: Also includes: a seventh half-bridge circuit, an output end of which is connected to one end of a fourth capacitor; an eighth half-bridge circuit, an output end of which is connected to one end of the fifth inductor; a ninth half-bridge circuit, an output end of which is connected to one end of the fifth capacitor; a tenth half-bridge circuit, an output end of which is connected to one end of the sixth inductor; a seventh inductor, one end of which is connected to the other end of the fourth capacitor and the other end of the fifth capacitor; the other end of the seventh inductor is connected to the other end of the fifth inductor and the other end of the sixth inductor; Among them, the input end of the seventh half-bridge circuit and the input end of the eighth half-bridge circuit are connected to the fourth voltage source; the input end of the ninth half-bridge circuit and the input end of the tenth half-bridge circuit are connected to the fifth voltage source; the amplitude and phase of the fourth voltage source and the fifth voltage source are consistent; the seventh inductor is the excitation inductor of the second LLC resonant converter circuit; the seventh inductor is also the primary inductor of the second transformer; the secondary inductor of the first transformer is connected in parallel with the secondary inductor of the second transformer.

8. The full-bridge LLC resonant converter circuit according to claim 7, characterized in that: Two ends of the first voltage source and the second voltage source are the first potential output end and the second potential output end respectively; Two ends of the fourth voltage source and the fifth voltage source are the second potential output end and the third potential output end respectively.

9. The full-bridge LLC resonant converter circuit according to claim 1, characterized in that: The first half-bridge circuit comprises: A first MOS tube, whose source and drain are connected in parallel with a first parasitic diode; A second MOS tube, whose source and drain are connected in parallel with a second parasitic diode; Among them, the drain of the first MOS tube is connected to the source of the second MOS tube; the source of the first MOS tube is the first voltage input end of the first half-bridge circuit; the drain of the second MOS tube is the second voltage input end of the first half-bridge circuit; the drain of the first MOS tube is the output end of the first half-bridge circuit.

10. The full-bridge LLC resonant converter circuit according to claim 1, characterized in that: Also includes: A filter circuit connected in parallel across the first voltage source and the second voltage source; The filter circuit is composed of a plurality of capacitors connected in parallel.

Images