Resonant converter

Abstract

The utility model provides a resonant converter. The resonant converter includes an input circuit, a primary side switching circuit, a resonant circuit, a transformer circuit, a secondary side switching circuit, and an output circuit. Each of a plurality of transformers of the transformer circuit comprises a primary side winding and a secondary side winding. The primary side windings are coupled to each other in a star connection, and the secondary side windings are coupled to each other in a delta connection. The secondary side switching circuit is coupled with the transformer circuit and comprises a plurality of input nodes. A plurality of input nodes are coupled to a secondary side winding of the transformer circuit in a star connection. Through the configuration of the plurality of resonant tanks and the transformer, the magnetic core loss is reduced, a good current balancing effect is achieved, and the effect of reducing the overall loss of the power supply circuit is achieved.

Description

Technical Field

[0001] This application relates to the technical field of power converters, and more particularly to a resonant converter. Background Technology

[0002] In low-voltage, high-current applications such as charging piles, energy storage systems, and artificial intelligence servers, power supply circuits often use a three-phase interleaved topology to distribute current stress. Power supply circuits basically include transformers and inductors, among other magnetic components. These magnetic components are affected by magnetic fields, resulting in losses. Furthermore, when there are characteristic errors between circuit components, the currents in each phase will become unbalanced, which also leads to an increase in the overall power supply circuit losses.

[0003] Therefore, how to effectively reduce the overall loss of power supply circuits is one of the problems that this field seeks to solve. Utility Model Content

[0004] To address the aforementioned technical problems, this application proposes a resonant converter that can achieve good current balance and reduce core losses, thereby reducing the overall losses of the power supply circuit.

[0005] To achieve one of the above objectives, this application proposes a resonant converter comprising an input circuit, a primary-side switching circuit, a resonant circuit, a transformer circuit, a secondary-side switching circuit, and an output circuit. The input circuit provides an input voltage. The primary-side switching circuit is coupled to the input circuit and includes a plurality of output nodes. The resonant circuit is electrically connected to the primary-side switching circuit and includes a plurality of resonant slots. Each of the plurality of resonant slots includes a plurality of resonant inductors. The transformer circuit is coupled to the resonant circuit. The transformer circuit has a plurality of transformers, each of which includes a primary winding and a secondary winding. The plurality of primary windings include an input terminal and an output terminal. The plurality of primary windings are star-connected to each other, and the plurality of secondary windings are delta-connected to each other. The secondary-side switching circuit is coupled to the transformer circuit and includes a plurality of input nodes. The plurality of input nodes are star-connected to the plurality of secondary windings of the transformer circuit. The output circuit is coupled to the secondary-side switching circuit and generates an output voltage.

[0006] Based on the above, the resonant converter of this application can reduce core loss through the configuration of multiple resonant slots and transformers, and can have a good current balance effect when there are characteristic errors in the circuit components, thereby reducing the overall loss of the power supply circuit. Attached Figure Description

[0007] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0008] Figure 1 This is a schematic diagram of a power supply circuit according to an embodiment of this application;

[0009] Figure 2 This is a schematic diagram of an embodiment of a resonant converter according to the present application;

[0010] Figure 3 This is a schematic diagram of a second embodiment of the resonant converter according to the present application;

[0011] Figure 4 This is a schematic diagram of a third embodiment of the resonant converter according to the present application;

[0012] Figure 5 This is a schematic diagram of Embodiment 4 of the resonant converter according to the embodiments of this application;

[0013] Figure 6 This is a schematic diagram of a control signal embodiment according to the present application.

[0014] Figure 7 This is a schematic diagram of an embodiment of the dead time according to the present application.

[0015] Figure 8 This is a schematic diagram of a second embodiment of the control signal according to the present application.

[0016] Figure 9A For the error comparison of three-phase current according to the embodiments of this application Figure 1 ;

[0017] Figure 9B For the error comparison of three-phase current according to the embodiments of this application Figure 2 ;

[0018] Figure 9C For the error comparison of three-phase current according to the embodiments of this application Figure 3 ;

[0019] Figure 10A This is a schematic diagram of an embodiment of the integrated magnetic core module according to the present application. Figure 1 ;

[0020] Figure 10B This is a schematic diagram of an embodiment of the integrated magnetic core module according to the present application. Figure 2 ;

[0021] Figure 10C This is a schematic diagram of an embodiment of the integrated magnetic core module according to the present application. Figure 3 ;

[0022] Figure 10D This is a schematic diagram of an embodiment of the integrated magnetic core module according to the present application. Figure 4 ;

[0023] Figure 11 This is a schematic diagram of the configuration positions of the transformer and resonant inductor according to an embodiment of this application;

[0024] Figure 12 This is a schematic diagram of the configuration positions of the transformer and resonant inductor according to Embodiment 2 of this application;

[0025] Figure 13 This is a schematic diagram of the configuration position of the transformer and resonant inductor according to Embodiment 3 of this application. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a power supply circuit according to an embodiment of this application. The power supply circuit 1 may include at least a resonant converter 10 and a control circuit 20. The resonant converter 10 is electrically connected to the control circuit 20. The resonant converter 10 is a DC-to-DC converter used to output a DC voltage to an electrically connected load or circuit. For example, it outputs a DC voltage to a voltage regulator (VR) circuit. The control circuit 20 is used to provide control signals required for the operation of the resonant converter 10. For example, control signals S1 to S12. The control circuit 20 is, for example, a microcontroller, and this application is not limited thereto.

[0028] Please refer to Figure 2 , Figure 2 This is a schematic diagram of an embodiment of a resonant converter according to an embodiment of this application. The resonant converter 11 includes an input circuit 100, a primary-side switching circuit 200, a resonant circuit 310, a transformer circuit 400, a secondary-side switching circuit 500, and an output circuit 600. The transformer circuit 400 includes a first transformer T1, a second transformer T2, and a third transformer T3. The secondary-side switching circuit 500 includes a first input node D, a second input node E, and a third input node F.

[0029] The input circuit 100 includes a voltage source Vs and an input capacitor Cin. The voltage source Vs provides the input voltage. The two ends of the input capacitor Cin are coupled to the voltage source Vs, that is, the input capacitor Cin and the voltage source Vs are connected in parallel and coupled.

[0030] The primary-side switching circuit 200 is coupled to the input circuit 100. The primary-side switching circuit 200 includes a first bridge arm 210, a second bridge arm 220, and a third bridge arm 230. The first bridge arm 210, the second bridge arm 220, and the third bridge arm 230 are connected in parallel and coupled to each other. The first bridge arm 210 includes a first switching unit SW1 and a second switching unit SW2 connected in series, with a first output node A located between the first switching unit SW1 and the second switching unit SW2. A first terminal of the first switching unit SW1 is coupled to a first terminal of the input capacitor Cin, and a second terminal of the first switching unit SW1 is coupled to the first output node A. The control terminal of the first switching unit SW1 receives the control signal S1. A first terminal of the second switching unit SW2 is coupled to the first output node A, and a second terminal of the second switching unit SW2 is coupled to a second terminal of the input capacitor Cin. The control terminal of the second switching unit SW2 receives the control signal S2. The second bridge arm 220 includes a third switch unit SW3 and a fourth switch unit SW4 connected in series, with a second output node B located between the third switch unit SW3 and the fourth switch unit SW4. The first terminal of the third switch unit SW3 is coupled to the first terminal of the input capacitor Cin, and the second terminal of the third switch unit SW3 is coupled to the second output node B. The control terminal of the third switch unit SW3 receives the control signal S3. The first terminal of the fourth switch unit SW4 is coupled to the second output node B, and the second terminal of the fourth switch unit SW4 is coupled to the second terminal of the input capacitor Cin. The control terminal of the fourth switch unit SW4 receives the control signal S4. The third bridge arm 230 includes a fifth switch unit SW5 and a sixth switch unit SW6 connected in series, with a third output node C located between the fifth switch unit SW5 and the sixth switch unit SW6. The first terminal of the fifth switch unit SW5 is coupled to the first terminal of the input capacitor Cin, and the second terminal of the fifth switch unit SW5 is coupled to the third output node C. The control terminal of the fifth switch unit SW5 receives the control signal S5. The first terminal of the sixth switching unit SW6 is coupled to the third output node C, the second terminal of the sixth switching unit SW6 is coupled to the second terminal of the input capacitor Cin, and the control terminal of the sixth switching unit SW6 receives the control signal S6.

[0031] The resonant circuit 310 includes a plurality of resonant slots. Each of the plurality of resonant slots includes a resonant capacitor and a resonant inductor. Further, the resonant circuit 310 includes a first resonant slot 311, a second resonant slot 313, and a third resonant slot 315. The first resonant slot 311 includes a first resonant inductor Lr1 and a first resonant capacitor Cr1. A first end of the first resonant inductor Lr1 is coupled to the first transformer T1, and a second end of the first resonant inductor Lr1 is coupled to the first end of the first resonant capacitor Cr1. A second end of the first resonant capacitor Cr1 is coupled to the second transformer T2. The second resonant slot 313 includes a second resonant inductor Lr2 and a second resonant capacitor Cr2. A first end of the second resonant inductor Lr2 is coupled to the second transformer T2, and a second end of the second resonant inductor Lr2 is coupled to the first end of the second resonant capacitor Cr2. A second end of the second resonant capacitor Cr2 is coupled to the third transformer T3. The third resonant slot 315 includes a third resonant inductor Lr3 and a third resonant capacitor Cr3. The first terminal of the third resonant inductor Lr3 is coupled to the third transformer T3, and the second terminal of the third resonant inductor Lr3 is coupled to the first terminal of the third resonant capacitor Cr3. The second terminal of the third resonant capacitor Cr3 is coupled to the first transformer T1. In this embodiment, the first resonant inductor Lr1, the second resonant inductor Lr2, the third resonant inductor Lr3, the first resonant capacitor Cr1, the second resonant capacitor Cr2, and the third resonant capacitor Cr3 are coupled to the primary side of the transformer circuit 400 in a delta connection.

[0032] The first transformer T1 has a primary winding Np1, a secondary winding Ns1, and a magnetizing inductor Lm1. The input terminal of the primary winding Np1 is coupled to the first output node A, and the output terminal of the primary winding Np1 is coupled to the first terminal of the first resonant inductor Lr1. The magnetizing inductor Lm1 is coupled between the input terminal and the output terminal of the primary winding Np1. The output terminal of the secondary winding Ns1 is coupled to the first input node D, and the input terminal of the secondary winding Ns1 is coupled to the second input node E. The second transformer T2 has a primary winding Np2, a secondary winding Ns2, and a magnetizing inductor Lm2. The input terminal of the primary winding Np2 is coupled to the second output node B, and the output terminal of the primary winding Np2 is coupled to the second terminal of the first resonant capacitor Cr1 and the first terminal of the second resonant inductor Lr2. The magnetizing inductor Lm2 is coupled between the input and output terminals of the primary winding Np2. The input terminal of the secondary winding Ns2 is coupled to the second input node E, and the input terminal of the secondary winding Ns2 is coupled to the third input node F. The third transformer T3 has a primary winding Np3, a secondary winding Ns3, and a magnetizing inductor Lm3. The input terminal of the primary winding Np3 is coupled to the third output node C, and the output terminal of the primary winding Np3 is coupled to the second terminal of the second resonant capacitor Cr2 and the first terminal of the third resonant inductor Lr3. The magnetizing inductor Lm3 is coupled between the input and output terminals of the primary winding Np3. The output terminal of the secondary winding Ns3 is coupled to the third input node F of the secondary switching circuit 500, and the input terminal of the secondary winding Ns1 is coupled to the first input node D. In this embodiment, the primary winding Np1 of the first transformer T1, the primary winding Np2 of the second transformer T2, and the primary winding Np3 of the third transformer T3 are coupled to each other in a star connection. The secondary winding Ns1 of the first transformer T1, the secondary winding Ns2 of the second transformer T2, and the secondary winding Ns3 of the third transformer T3 are coupled to each other in a delta connection.

[0033] The secondary-side switching circuit 500 includes a first rectifier unit 510, a second rectifier unit 520, and a third rectifier unit 530. The first rectifier unit 510, the second rectifier unit 520, and the third rectifier unit 530 are connected in parallel and coupled to each other. The first rectifier unit 510 includes a seventh switch unit SW7 and an eighth switch unit SW8 connected in series. The first input node D is located between the seventh switch unit SW7 and the eighth switch unit SW8. The first terminal of the seventh switch unit SW7 is coupled to the output circuit 600, and the second terminal of the seventh switch unit SW7 is coupled to the first input node D. The control terminal of the seventh switch unit SW7 receives the control signal S7. The first terminal of the eighth switch unit SW8 is coupled to the first input node D, and the second terminal of the eighth switch unit SW8 is coupled to the output circuit 600. The control terminal of the eighth switch unit SW8 receives the control signal S8. The second rectifier unit 520 includes a ninth switch unit SW9 and a tenth switch unit SW10 connected in series. The second input node E is located between the ninth switch unit SW9 and the tenth switch unit SW10. The first terminal of the ninth switch unit SW9 is coupled to the output circuit 600, and the second terminal of the ninth switch unit SW9 is coupled to the second input node E. The control terminal of the ninth switch unit SW9 receives the control signal S9. The first terminal of the tenth switch unit SW10 is coupled to the second input node E, and the second terminal of the tenth switch unit SW10 is coupled to the output circuit 600. The control terminal of the tenth switch unit SW10 receives the control signal S10. The third rectifier unit 530 includes an eleventh switch unit SW11 and a twelfth switch unit SW12 connected in series. The third input node F is located between the eleventh switch unit SW11 and the twelfth switch unit SW12. The first terminal of the eleventh switch unit SW11 is coupled to the output circuit 600, and the second terminal of the eleventh switch unit SW11 is coupled to the third input node F. The control terminal of the eleventh switch unit SW11 receives the control signal S11. The first terminal of the twelfth switching unit SW12 is coupled to the third input node F, and the second terminal of the twelfth switching unit SW12 is coupled to the output circuit 600. The control terminal of the twelfth switching unit SW12 receives the control signal S12. In this embodiment, the first input node D, the second input node E, and the third input node F are coupled to the secondary side of the transformer circuit 400 in a star connection.

[0034] In one embodiment, the first switching unit SW1 to the twelfth switching unit SW12 may be a metal-oxide-semiconductor field-effect transistor (MOSFET), a trench MOSFET, or an insulated gate bipolar transistor (IGBT), and this application is not limited thereto.

[0035] The output circuit 600 is coupled to the secondary-side switching circuit 500 and includes an output capacitor Co and an output resistor Ro connected in parallel. The first terminals of the output capacitor Co and the output resistor Ro are coupled to the first terminals of the seventh switching unit SW7, the ninth switching unit SW9, and the eleventh switching unit SW11. The second terminals of the output capacitor Co and the output resistor Ro are coupled to the second terminals of the eighth switching unit SW8, the tenth switching unit SW10, and the twelfth switching unit SW12. The output circuit 600 is used to generate an output voltage to the coupled load.

[0036] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a second embodiment of the resonant converter according to an embodiment of this application. Figure 2 and Figure 3 In this context, components with the same component symbol have the same function, so this will not be elaborated further. Figure 3 and Figure 2The difference lies in that the resonant converter 12 includes the input circuit 100, the primary-side switching circuit 200, the resonant circuit 320, the transformer circuit 400, the secondary-side switching circuit 500, and the output circuit 600. The resonant circuit 320 includes a first resonant slot 321, a second resonant slot 323, and a third resonant slot 325. The first resonant slot 321 includes a first resonant inductor Lr1 and a first resonant capacitor Cr1. The first end of the first resonant inductor Lr1 is coupled to the output terminal of the primary-side winding Np1, and the second end of the first resonant inductor Lr1 is coupled to the output terminal of the primary-side winding Np2. The first end of the first resonant capacitor Cr1 is coupled to the first output node A, and the second end of the first resonant capacitor Cr1 is coupled to the input terminal of the primary-side winding Np1. The second resonant slot 323 includes a second resonant inductor Lr2 and a second resonant capacitor Cr2. The first end of the second resonant inductor Lr2 is coupled to the output terminal of the primary winding Np2, and the second end of the second resonant inductor Lr2 is coupled to the output terminal of the primary winding Np3. The first end of the second resonant capacitor Cr2 is coupled to the second output node B, and the second end of the second resonant capacitor Cr2 is coupled to the input terminal of the primary winding Np2. The third resonant slot 325 includes a third resonant inductor Lr3 and a third resonant capacitor Cr3. The first end of the third resonant inductor Lr3 is coupled to the output terminal of the primary winding Np3, and the second end of the third resonant inductor Lr3 is coupled to the output terminal of the primary winding Np1. The first end of the third resonant capacitor Cr3 is coupled to the third output node C, and the second end of the third resonant capacitor Cr3 is coupled to the input terminal of the primary winding Np3. In this embodiment, the output terminals of the primary winding Np1, Np2, and Np3, the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3 are coupled to each other in a delta configuration.

[0037] Please refer to Figure 4 , Figure 4 This is a schematic diagram of Embodiment 3 of the resonant converter according to embodiments of this application. Figure 3 and Figure 4 In this context, components with the same component symbol have the same function, so this will not be elaborated further. Figure 4 and Figure 3The difference lies in that the resonant converter 13 includes the input circuit 100, the primary-side switching circuit 200, the resonant circuit 330, the transformer circuit 400, the secondary-side switching circuit 500, and the output circuit 600. The resonant circuit 330 includes a first resonant slot 331, a second resonant slot 333, and a third resonant slot 335. In this embodiment, the first end of the first resonant inductor Lr1 is coupled to the second end of the first resonant capacitor Cr1, and the second end of the first resonant inductor Lr1 is coupled to the input end of the primary winding Np1. The first end of the second resonant inductor Lr2 is coupled to the second end of the second resonant capacitor Cr2, and the second end of the second resonant inductor Lr2 is coupled to the input end of the primary winding Np2. The first end of the third resonant inductor Lr3 is coupled to the second end of the third resonant capacitor Cr3, and the second end of the third resonant inductor Lr3 is coupled to the input end of the primary winding Np3. In this embodiment, the first resonant capacitor Cr1, the second resonant capacitor Cr2, the third resonant capacitor Cr3, the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3 are coupled to the primary windings Np1, Np2, and Np3 in a star connection, and the primary windings Np1, Np2, and Np3 are mutually coupled in a star connection.

[0038] Please refer to Figure 5 , Figure 5 This is a schematic diagram of a second embodiment of the resonant converter according to an embodiment of this application. Figure 2 and Figure 5 In this context, components with the same component symbol have the same function, so this will not be elaborated further. Figure 5 and Figure 2The difference lies in that the resonant converter 14 includes the input circuit 100, the primary-side switching circuit 200, the resonant circuit 340, the transformer circuit 400, the secondary-side switching circuit 500, and the output circuit 600. The resonant circuit 340 includes a first resonant slot 341, a second resonant slot 343, and a third resonant slot 345. The first resonant slot 341 includes a first resonant inductor Lr1 and a first resonant capacitor Cr1. The first end of the first resonant inductor Lr1 is coupled to the first output node A, and the second end of the first resonant inductor Lr1 is coupled to the input terminal of the primary-side winding Np1. The first end of the first resonant capacitor Cr1 is coupled to the output terminal of the primary-side winding Np1, and the second end of the first resonant capacitor Cr1 is coupled to the output terminal of the primary-side winding Np2. The second resonant slot 343 includes a second resonant inductor Lr2 and a second resonant capacitor Cr2. The first end of the second resonant inductor Lr2 is coupled to the second output node B, and the second end of the second resonant inductor Lr2 is coupled to the input terminal of the primary winding Np2. The first end of the second resonant capacitor Cr2 is coupled to the output terminal of the primary winding Np2, and the second end of the second resonant capacitor Cr2 is coupled to the output terminal of the primary winding Np3. The third resonant slot 345 includes a third resonant inductor Lr3 and a third resonant capacitor Cr3. The first end of the third resonant inductor Lr3 is coupled to the third output node C, and the second end of the third resonant inductor Lr3 is coupled to the input terminal of the primary winding Np3. The first end of the third resonant capacitor Cr3 is coupled to the output terminal of the primary winding Np3, and the second end of the third resonant capacitor Cr3 is coupled to the output terminal of the primary winding Np1. In this embodiment, the output terminals of the primary winding Np1, Np2, and Np3, the first resonant capacitor Cr1, the second resonant capacitor Cr2, and the third resonant capacitor Cr3 are coupled to each other in a delta configuration.

[0039] Please refer to Figure 6 , Figure 6 This is a schematic diagram of a control signal embodiment according to an embodiment of this application. Figure 6 In the diagram, the horizontal axis represents time, and the vertical axis represents voltage level. Figure 6The system includes control signals S1 to S6. Each control signal includes a high voltage level and a low voltage level. Control signal S1 and control signal S2 have a phase difference of 180 degrees, and they are complementary. Control signal S3 and control signal S4 have a phase difference of 180 degrees, and they are complementary. Control signal S5 and control signal S6 have a phase difference of 180 degrees, and they are complementary. Control signal S1 and control signal S3 have a phase difference of 120 degrees. Control signal S3 and control signal S5 have a phase difference of 120 degrees. Control signal S2 and control signal S4 have a phase difference of 120 degrees. Control signal S4 and control signal S6 have a phase difference of 120 degrees.

[0040] In one embodiment, a first dead time td1 is present between control signal S1 and control signal S2, between control signal S3 and control signal S4, and between control signal S5 and control signal S6. Figure 7 For example, there is a first dead time td1 between the falling edge of the control signal S1 and the rising edge of the control signal S2. This prevents switches on the same bridge arm (e.g., the first switching unit SW1 and the second switching unit SW2) from being turned on simultaneously. In one embodiment, the length of the first dead time td1 can be determined by the parasitic capacitance of the plurality of switching units of the primary-side switching circuit 200 and the secondary-side switching circuit 500, and the magnetizing inductance of the plurality of transformers. For example, when the magnetizing inductance is small, the switching unit can discharge quickly, so the length of the first dead time td1 can be relatively small. When the magnetizing inductance is large, the switching unit requires a longer discharge time, so the length of the first dead time td1 can be relatively large to ensure that the plurality of switching units operate at zero voltage switching.

[0041] Please refer to Figure 8 , Figure 8 This is a schematic diagram of a second embodiment of the control signal according to an embodiment of this application. Figure 8 In the diagram, the horizontal axis represents time, and the vertical axis represents voltage level. Figure 8 This includes control signals S7 to S12. Each control signal includes a high voltage level and a low voltage level. Control signal S7 and control signal S8 are complementary to each other. Control signal S9 and control signal S10 are complementary to each other. Control signal S11 and control signal S12 are complementary to each other. This prevents the simultaneous conduction of switches in the same rectifier unit (e.g., the seventh switch unit SW7 and the eighth switch unit SW8).

[0042] Next Figure 2 , Figure 6 and Figure 8 The operation of the resonant converter of this application is illustrated using an example. From time t0 to t1, the first switching unit SW1 is on, the second switching unit SW2 is off, the third switching unit SW3 is on, the fourth switching unit SW4 is off, the fifth switching unit SW5 is off, and the sixth switching unit SW6 is on. The first switching unit SW1 generates and transmits an input current I1 to the first transformer T1 based on the input voltage. The second switching unit SW2 generates and transmits an input current I2 to the second transformer T2 based on the input voltage. The primary side of the first transformer T1 generates a first input voltage and a first input current based on the input current I1, and the secondary side of the first transformer T1 generates a second output voltage and a second output current based on the first input voltage and the first input current. The operation of the second transformer T2 is similar to that of the first transformer T1, and therefore will not be described further here. Accordingly, the seventh switch unit SW7 is turned on, the eighth switch unit SW8 is turned off, the ninth switch unit SW9 is turned off, the tenth switch unit SW10 is turned on, the eleventh switch unit SW11 is turned off, and the twelfth switch unit SW12 is turned on. The seventh switch unit SW7 generates an output current based on the second output voltage of the secondary side of the first transformer T1. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0043] From time point t1 to t2, the first switching unit SW1 is on, the second switching unit SW2 is off, the third switching unit SW3 is on, the fourth switching unit SW4 is off, the fifth switching unit SW5 is off, and the sixth switching unit SW6 is on. Correspondingly, the seventh switching unit SW7 is on, the eighth switching unit SW8 is off, the ninth switching unit SW9 is off, the tenth switching unit SW10 is off, the eleventh switching unit SW11 is off, and the twelfth switching unit SW12 is on. The seventh switching unit SW7 generates an output current based on the second output voltage on the secondary side of the first transformer T1. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0044] From time point t2 to t3, the first switching unit SW1 is on, the second switching unit SW2 is off, the third switching unit SW3 is off, the fourth switching unit SW4 is on, the fifth switching unit SW5 is off, and the sixth switching unit SW6 is on. The first switching unit SW1 generates and transmits an input current I1 to the first resonant tank 311 based on the input voltage. Correspondingly, the seventh switching unit SW7 is on, the eighth switching unit SW8 is off, the ninth switching unit SW9 is on, the tenth switching unit SW10 is off, the eleventh switching unit SW11 is off, and the twelfth switching unit SW12 is on. The seventh switching unit SW7 generates an output current based on the second output voltage on the secondary side of the first transformer T1. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0045] From time point t3 to t4, the first switching unit SW1 is on, the second switching unit SW2 is off, the third switching unit SW3 is off, the fourth switching unit SW4 is on, the fifth switching unit SW5 is off, and the sixth switching unit SW6 is on. Correspondingly, the seventh switching unit SW7 is on, the eighth switching unit SW8 is off, the ninth switching unit SW9 is off, the tenth switching unit SW10 is on, the eleventh switching unit SW11 is off, and the twelfth switching unit SW12 is off. The seventh switching unit SW7 generates an output current based on the second output voltage on the secondary side of the first transformer T1. This output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0046] From time t4 to t5, the first switching unit SW1 is on, the second switching unit SW2 is off, the third switching unit SW3 is off, the fourth switching unit SW4 is on, the fifth switching unit SW5 is on, and the sixth switching unit SW6 is off. The first switching unit SW1 generates and transmits the input current I1 to the first transformer T1. The fifth switching unit SW5 generates and transmits the input current I3 to the third transformer T3 based on the input voltage. The primary side of the first transformer T1 generates a first input voltage and a first input current based on the input current I1, and the secondary side of the first transformer T1 generates a second output voltage and a second output current based on the first input voltage and the first input current. The operation of the third transformer T3 is similar to that of the first transformer T1, and therefore will not be described further. Correspondingly, the seventh switching unit SW7 is on, the eighth switching unit SW8 is off, the ninth switching unit SW9 is off, the tenth switching unit SW10 is on, the eleventh switching unit SW11 is on, and the twelfth switching unit SW12 is off. The seventh switching unit SW7 generates an output current based on the second output voltage on the secondary side of the first transformer T1, and the eleventh switching unit SW11 generates an output current based on the second output voltage on the secondary side of the third transformer T3. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0047] From time point t5 to t6, the first switching unit SW1 is on, the second switching unit SW2 is off, the third switching unit SW3 is off, the fourth switching unit SW4 is on, the fifth switching unit SW5 is on, and the sixth switching unit SW6 is off. Correspondingly, the seventh switching unit SW7 is off, the eighth switching unit SW8 is off, the ninth switching unit SW9 is off, the tenth switching unit SW10 is on, the eleventh switching unit SW11 is on, and the twelfth switching unit SW12 is off. The eleventh switching unit SW11 generates an output current based on the second output voltage on the secondary side of the third transformer T3. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0048] From time t6 to t7, the first switch unit SW1 is off, the second switch unit SW2 is on, the third switch unit SW3 is off, the fourth switch unit SW4 is on, the fifth switch unit SW5 is on, and the sixth switch unit SW6 is off. The fifth switch unit SW5 generates and transmits an input current I3 to the third transformer T3. The primary side of the third transformer T3 generates a first input voltage and a first input current based on the input current I3, and the secondary side of the third transformer T3 generates a second output voltage and a second output current based on the first input voltage and the first input current. Correspondingly, the seventh switch unit SW7 is off, the eighth switch unit SW8 is on, the ninth switch unit SW9 is off, the tenth switch unit SW10 is on, the eleventh switch unit SW11 is on, and the twelfth switch unit SW12 is off. The eleventh switch unit SW11 generates an output current based on the second output voltage of the secondary side of the third transformer T3, and the output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0049] From time point t7 to t8, the first switch unit SW1 is off, the second switch unit SW2 is on, the third switch unit SW3 is off, the fourth switch unit SW4 is on, the fifth switch unit SW5 is on, and the sixth switch unit SW6 is off. Correspondingly, the seventh switch unit SW7 is off, the eighth switch unit SW8 is on, the ninth switch unit SW9 is off, the tenth switch unit SW10 is off, the eleventh switch unit SW11 is on, and the twelfth switch unit SW12 is off. The eleventh switch unit SW11 generates an output current based on the second output voltage on the secondary side of the third transformer T3. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0050] From time t8 to t9, the first switch unit SW1 is closed, the second switch unit SW2 is open, the third switch unit SW3 is open, the fourth switch unit SW4 is closed, the fifth switch unit SW5 is open, and the sixth switch unit SW6 is closed. The third switch unit SW3 generates and transmits an input current I2 to the second transformer T2. The fifth switch unit SW5 generates and transmits an input current I3 to the third transformer T3. The primary side of the second transformer T2 generates a first input voltage and a first input current based on the input current I2, and the secondary side of the second transformer T2 generates a second output voltage and a second output current based on the first input voltage and the first input current. The operation of the third transformer T3 is similar to that of the second transformer T2, and therefore will not be described further. Correspondingly, the seventh switch unit SW7 is closed, the eighth switch unit SW8 is open, the ninth switch unit SW9 is open, the tenth switch unit SW10 is closed, the eleventh switch unit SW11 is open, and the twelfth switch unit SW12 is closed. The ninth switching unit SW9 generates an output current based on the second output voltage on the secondary side of the second transformer T2. The eleventh switching unit SW11 generates an output current based on the second output voltage on the secondary side of the third transformer T3. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0051] From time point t9 to t10, the first switching unit SW1 is off, the second switching unit SW2 is on, the third switching unit SW3 is on, the fourth switching unit SW4 is off, the fifth switching unit SW5 is on, and the sixth switching unit SW6 is off. Correspondingly, the seventh switching unit SW7 is off, the eighth switching unit SW8 is on, the ninth switching unit SW9 is on, the tenth switching unit SW10 is off, the eleventh switching unit SW11 is off, and the twelfth switching unit SW12 is off. The ninth switching unit SW9 generates an output current based on the second voltage on the secondary side of the second transformer T2. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0052] From time point t10 to t11, the first switching unit SW1 is closed, the second switching unit SW2 is open, the third switching unit SW3 is open, the fourth switching unit SW4 is closed, the fifth switching unit SW5 is closed, and the sixth switching unit SW6 is open. The third switching unit SW3 generates and transmits the input current I2. The primary side of the second transformer T2 generates a first input voltage and a first input current, and the secondary side of the second transformer T2 generates a second output voltage and a second output current based on the first input voltage and the first input current. Correspondingly, the seventh switching unit SW7 is closed, the eighth switching unit SW8 is open, the ninth switching unit SW9 is open, the tenth switching unit SW10 is closed, the eleventh switching unit SW11 is closed, and the twelfth switching unit SW12 is open. The ninth switching unit SW9 generates an output current based on the second output voltage of the secondary side of the second transformer T2, and the output current is input to the output capacitor Co and the output resistor Ro to generate the output voltage.

[0053] From time point t11 ​​to t12, the first switch unit SW1 is closed, the second switch unit SW2 is open, the third switch unit SW3 is open, the fourth switch unit SW4 is closed, the fifth switch unit SW5 is closed, and the sixth switch unit SW6 is open. Correspondingly, the seventh switch unit SW7 is closed, the eighth switch unit SW8 is closed, the ninth switch unit SW9 is open, the tenth switch unit SW10 is closed, the eleventh switch unit SW11 is closed, and the twelfth switch unit SW12 is open. The ninth switch unit SW9 generates an output current based on the second output voltage on the secondary side of the second transformer T2. The output current is input to the output capacitor Co and the output resistor Ro to generate an output voltage.

[0054] In one embodiment, under the same ZVS current conditions, the specifications of the half-bridge-half-bridge resonant converter and the specifications of the resonant converter of this application can be set as shown in Tables 1 and 2.

[0055]

[0056] Table 1

[0057] It should be noted that the turns ratios of the first transformer T1, the second transformer T2, and the third transformer T3 are all set to the turns ratios shown in Table 1. The first dead time td1 is set to the dead time shown in Table 1, the magnetizing inductors Lm1, Lm2, and Lm3 are all set to the magnetizing inductors shown in Table 1, the first resonant capacitor Cr1, the second resonant capacitor Cr2, and the third resonant capacitor Cr3 are all set to the resonant capacitors shown in Table 1, and the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3 are all set to the resonant inductors shown in Table 1. Therefore, the embodiments of this application can reduce the number of primary windings compared to a half-bridge-half-bridge resonant converter.

[0058]

[0059] Table 2

[0060] It should be noted that the primary winding Np1 of the first transformer T1, the primary winding Np2 of the second transformer T2, and the primary winding Np3 of the third transformer T3 are all set as the primary windings shown in Table 2, and the secondary windings Ns1 of the first transformer T1, the secondary winding Ns2 of the second transformer T2, and the secondary winding Ns3 of the third transformer T3 are all set as the secondary windings shown in Table 2.

[0061] The performance of the half-bridge to half-bridge resonant converter and the resonant converter of this application are shown in Tables 3 and 4.

[0062]

[0063] Table 3

[0064] It should be noted that the primary-side switch in Table 3 refers to the primary-side switch circuit 200, the primary-side transformer in Table 3 refers to the primary side of the transformer circuit 400, the secondary-side switch in Table 3 refers to the secondary-side switch circuit 500, and the secondary-side transformer in Table 3 refers to the secondary side of the transformer circuit 400. As can be seen from Table 3, compared to a half-bridge-half-bridge resonant converter, the embodiments of this application have smaller peak secondary-side switch current, smaller effective value of secondary-side switch current, and smaller effective value of secondary-side transformer current. In other words, the embodiments of this application have smaller secondary-side current stress compared to a half-bridge-half-bridge resonant converter.

[0065]

[0066] Table 4

[0067] As shown in Table 4, under the same peak excitation current, the resonant converter of this application embodiment has fewer primary-side coils than the half-bridge-half-bridge resonant converter. Furthermore, the secondary-side current stress of this application embodiment is lower than that of the half-bridge-half-bridge resonant converter.

[0068] Please refer to Figure 2 , Figure 9A , Figure 9B and Figure 9C . Figure 9A , Figure 9B and Figure 9C This is a comparison diagram of the three-phase current errors of a resonant converter and a half-bridge-half-bridge resonant converter according to an embodiment of this application.

[0069] Figure 9A The current change is defined as follows: the value of the second resonant inductor Lr2 is 1.1 times the value of the first resonant inductor Lr1, and the value of the third resonant inductor Lr3 is 0.9 times the value of the first resonant inductor Lr1. Figure 9A The upper part represents the current changes of the first current Ip1, the second current Ip2, and the third current Ip3 of the half-bridge to half-bridge resonant converter. Figure 9A The lower half represents the current changes of the input currents I1, I2, and I3 of the resonant converter according to an embodiment of this application. The first current Ip1 is in phase with the input current I1. The second current Ip2 is in phase with the input current I2. The third current Ip3 is in phase with the input current I3. Figure 9B The current change values ​​when the value of the second resonant capacitor Cr2 is 1.1 times the value of the first resonant capacitor Cr1 and the value of the third resonant capacitor Cr3 is 0.9 times the value of the first resonant capacitor Cr1. Figure 9B The upper part represents the current changes of the first current Ip1, the second current Ip2, and the third current Ip3 of the half-bridge to half-bridge resonant converter. Figure 9B The lower half represents the current changes of the input currents I1, I2, and I3 of the resonant converter according to an embodiment of this application. The first current Ip1 is in phase with the input current I1. The second current Ip2 is in phase with the input current I2. The third current Ip3 is in phase with the input current I3. Figure 9C The current change is defined as follows: the value of the second resonant inductor Lr2 is 1.1 times the value of the first resonant inductor Lr1, the value of the third resonant inductor Lr3 is 0.9 times the value of the first resonant inductor Lr1, and the value of the second resonant capacitor Cr2 is 1.1 times the value of the first resonant capacitor Cr1, and the value of the third resonant capacitor Cr3 is 0.9 times the value of the first resonant capacitor Cr1. Figure 9CThe upper part represents the current changes of the first current Ip1, the second current Ip2, and the third current Ip3 of the half-bridge to half-bridge resonant converter. Figure 9C The lower half of the figure shows the current variations of the input currents I1, I2, and I3 of the resonant converter according to an embodiment of this application. The first current Ip1 is in phase with the input current I1. The second current Ip2 is in phase with the input current I2. The third current Ip3 is in phase with the input current I3. As can be seen from the figure, under different component errors, the peak differences of the input currents I1, I2, and I3 under different component errors in this embodiment are smaller than the peak differences of the first current Ip1, the second current Ip2, and the third current Ip3 under different component errors. That is, the current difference caused by component errors in the resonant converter of this embodiment is smaller than the current difference caused by component errors in a half-bridge-half-bridge resonant converter. Therefore, the resonant converter of this application has a higher tolerance for current errors caused by component errors.

[0070] The performance of the half-bridge to half-bridge resonant converter and the resonant converter of this application are shown in Tables 5 and 6.

[0071]

[0072] Table 5

[0073] In Table 5, I Lr1 I Lr2 and I Lr3 The values ​​represent the currents of the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3. As shown in Table 5, when component errors exist in the resonant converter of this embodiment, the change in the current of its resonant inductor is significantly smaller than that of the resonant inductor in the half-bridge-half-bridge resonant converter. The current difference caused by component errors in the resonant converter of this embodiment is less than that caused by component errors in the half-bridge-half-bridge resonant converter.

[0074]

[0075] Table 6

[0076] As can be seen from Table 6, the copper losses on both the primary and secondary sides of the embodiments of this application are lower than those of the half-bridge-half-bridge resonant converter, and the total transformer loss of the embodiments of this application is also lower than that of the half-bridge-half-bridge resonant converter. The conversion efficiency of the transformer in the embodiments of this application is higher than that of the half-bridge-half-bridge resonant converter.

[0077] In the embodiments of this application, the plurality of resonant inductors and the plurality of transformers of the resonant converter can be individually implemented with discrete magnetic cores or implemented by a single integrated magnetic core module.

[0078] Please refer to Figures 10A to 10D . Figures 10A to 10D This is a schematic diagram of an embodiment of an integrated magnetic core module according to an embodiment of this application. The integrated magnetic core module 700 includes an upper cover 710, a lower cover 720, a plurality of transformer core posts 740, a plurality of inductor core posts 750, and a common post 730. The plurality of transformer core posts 740, the plurality of inductor core posts 750, and the common post 730 are disposed between the upper cover 710 and the lower cover 720. The plurality of transformer core posts 740 and the plurality of inductor core posts 750 are arranged around the common post 730. The plurality of transformer core posts 740 and the plurality of inductor core posts 750 are arranged alternately. Each inductor core post 750 is located between two transformer core posts 740. The plurality of transformer core posts 740 and the common post 730 are equidistant, and the plurality of inductor core posts 750 and the common post 730 are equidistant. By ensuring that the distances between the plurality of transformer core posts 740 and the common post 730 are the same, and the distances between the plurality of inductor core posts 750 and the common post 730 are the same, magnetic flux balance between phases can be effectively maintained. In one embodiment, the common post 730 is located at the center of the lower cover 720.

[0079] The cross-sectional areas of the plurality of transformer core columns 740 are equal. The cross-sectional area of ​​the plurality of transformer core columns 740 is the same as that of the common column 730. Each transformer core column 740 includes two core column units 741. The two core column units 741 are stacked on top of each other. An air gap 742 is formed between the two core column units 741. The size of the air gap 742 in each transformer core column 740 is the same.

[0080] The cross-sectional areas of the plurality of inductor cores 750 are equal. The cross-sectional area of ​​the plurality of transformer cores 740 is greater than the cross-sectional area of ​​the plurality of inductor cores 750. In one embodiment, the cross-sectional area of ​​the transformer core 740 is at least twice the cross-sectional area of ​​the inductor core 750. Each inductor core 750 includes two core unit 751. The two core unit 751 are stacked on top of each other. An air gap 752 is formed between the two core unit 751. The size of the air gap 752 of each inductor core 750 is the same. In one embodiment, the air gap 752 of the plurality of inductor cores 750 is greater than the air gap 742 of the plurality of transformer cores 740. In one embodiment, the air gap 752 of the inductor core 750 is at least three times the air gap 742 of the plurality of transformer cores 740.

[0081] Each transformer core 740 is used to house a primary winding 7431 and a secondary winding 7432. The winding direction of the primary winding 7431 and the secondary winding 7432 is clockwise or counterclockwise. The primary winding 7431 is, for example, the aforementioned primary winding Np1, primary winding Np2, or primary winding Np3. The secondary winding 7432 is, for example, the aforementioned secondary winding Ns1, secondary winding Ns2, or secondary winding Ns1. Therefore, the aforementioned plurality of transformers (first transformer T1, second transformer T2, and third transformer T3) can be individually implemented by a set of transformer cores 740, primary windings 7431, and secondary windings 7432. The positions of the plurality of transformers in the integrated magnetic core module 700 can be adjusted as needed.

[0082] In one embodiment, the primary winding 7431 is, for example, wound with stranded wire. Since the air gap 742 is located at the center of the transformer core 740, the use of stranded wire effectively reduces AC losses caused by the air gap 742. In one embodiment, the secondary winding 7432 is, for example, wound with copper sheet. Because the secondary winding 7432 carries a larger current, copper sheet capable of carrying a larger current is chosen.

[0083] Each of the aforementioned inductor cores 750 is provided with an inductor coil 753. The winding direction of the inductor coil 753 is either clockwise or counterclockwise. Therefore, the aforementioned plurality of resonant inductors (first resonant inductor Lr1, second resonant inductor Lr2, and third resonant inductor Lr3) can be individually implemented by a set of inductor cores 750 and inductor coils 753. The positions of the plurality of resonant inductors in the integrated magnetic core module 700 can be adjusted as needed.

[0084] In one embodiment, the inductor coil 753 is, for example, made of stranded wire. Since the air gap 752 is located at the center of the inductor core 750, the AC loss (ACLoss) caused by the air gap 752 can be effectively reduced by using stranded wire.

[0085] In one embodiment, the shapes of the upper cover 710 and the lower cover 720 may correspond to each other. The shapes of the upper cover 710 and the lower cover 720 may be circular, square, or triangular, and this application is not limited thereto.

[0086] Please refer to Figures 11 to 13 . Figures 11 to 13 Schematic diagrams illustrating the configuration positions of the transformer and resonant inductor in embodiments one to three. Figure 11In Embodiment 1, the components arranged clockwise are, in order: the first transformer T1, the second resonant inductor Lr2, the second transformer T2, the third resonant inductor Lr3, the third transformer T3, and the first resonant inductor Lr1. The winding directions of the coils of the first transformer T1, the second transformer T2, and the third transformer T3 are the same as the winding directions of the coils of the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3. The magnetic flux directions of the first transformer T1, the second transformer T2, the third transformer T3, the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3 are the same. Figure 12 In Embodiment 2, the components arranged clockwise are, in order: the first transformer T1, the second resonant inductor Lr2, the second transformer T2, the third resonant inductor Lr3, the third transformer T3, and the first resonant inductor Lr1. In this embodiment, the winding directions of the coils of the first transformer T1, the second transformer T2, and the third transformer T3 are different from the winding directions of the coils of the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3. The magnetic flux directions of the first transformer T1, the second transformer T2, and the third transformer T3 are also different from the magnetic flux directions of the first resonant inductor Lr1, the second resonant inductor Lr2, and the third resonant inductor Lr3. Figure 13 In Embodiment 3, the transformers are arranged clockwise as follows: first transformer T1, first resonant inductor Lr1, second transformer T2, second resonant inductor Lr2, third transformer T3, and third resonant inductor Lr3. In this embodiment, the winding directions of the coils of the first transformer T1, second transformer T2, and third transformer T3 are the same as the winding directions of the coils of the first resonant inductor Lr1, second resonant inductor Lr2, and third resonant inductor Lr3. The magnetic flux directions of the first transformer T1, second transformer T2, and third transformer T3 are the same as the magnetic flux directions of the first resonant inductor Lr1, second resonant inductor Lr2, and third resonant inductor Lr3.

[0087] Figures 11 to 13 The performance of the integrated magnetic core module 700 is shown in Table 7.

[0088]

[0089] Table 7

[0090] As can be seen from Table 7, through Figure 11 The configuration of this embodiment allows the magnetic flux of the upper cover 710 and the lower cover 720 to cancel each other out, effectively reducing the total loss of the integrated magnetic core module 700.

[0091] In summary, since the resonant converter of this application can reduce core loss through the configuration of multiple resonant slots and the design of integrated magnetic core modules, and has a good current balance effect when there are characteristic errors in the components, it can achieve the effect of reducing the overall loss of the power supply circuit.

[0092] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0093] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms fall within the scope of protection of this application.

Claims

1. A resonant converter, characterized in that, include: The input circuit provides the input voltage; A primary-side switching circuit, coupled to the input circuit, includes a plurality of output nodes; The resonant circuit, electrically connected to the primary-side switching circuit, includes a plurality of resonant slots, each of the plurality of resonant slots including a plurality of resonant inductors; A transformer circuit coupled to the resonant circuit, the transformer circuit having a plurality of transformers, each of the plurality of transformers including a primary winding and a secondary winding, the primary winding including an input terminal and an output terminal, the plurality of primary windings being coupled to each other in a star connection, and the plurality of secondary windings being coupled to each other in a delta connection. A secondary-side switching circuit, coupled to the transformer circuit, includes a plurality of input nodes, wherein the plurality of input nodes are coupled to a plurality of the secondary-side windings of the transformer circuit in a star connection. as well as The output circuit is coupled to the secondary-side switching circuit and generates an output voltage.

2. The resonant converter according to claim 1, characterized in that, The primary-side switching circuit includes: The first bridge arm includes a first switch unit and a second switch unit connected in series, and the first output node is located between the first switch unit and the second switch unit. The second bridge arm includes a third switch unit and a fourth switch unit connected in series, with the second output node located between the third switch unit and the fourth switch unit; and The third bridge arm includes a fifth switch unit and a sixth switch unit connected in series, and the third output node is located between the fifth switch unit and the sixth switch unit.

3. The resonant converter according to claim 2, characterized in that, The control signals of the first and second switching units are complementary to each other, the control signals of the third and fourth switching units are complementary to each other, and the control signals of the fifth and sixth switching units are complementary to each other.

4. The resonant converter according to claim 3, characterized in that, There is a first dead time between the control signal of the first switch unit and the control signal of the second switch unit, between the control signal of the third switch unit and the control signal of the fourth switch unit, and between the control signal of the fifth switch unit and the control signal of the sixth switch unit.

5. The resonant converter according to claim 2, characterized in that, The control signal of the first switching unit and the control signal of the third switching unit are 120 degrees out of phase, and the control signal of the third switching unit and the control signal of the fifth switching unit are 120 degrees out of phase.

6. The resonant converter according to claim 1, characterized in that, The transformer circuit includes a first transformer, a second transformer, and a third transformer. The output terminal of the primary winding of the first transformer, the output terminal of the primary winding of the second transformer, and the output terminal of the primary winding of the third transformer are coupled to the resonant circuit.

7. The resonant converter according to claim 6, characterized in that, The resonant circuit includes: The first resonant slot includes a first resonant inductor and a first resonant capacitor connected in series. The first resonant inductor is coupled to the output terminal of the primary winding of the first transformer, and the first resonant capacitor is coupled to the output terminal of the primary winding of the second transformer. The second resonant slot includes a second resonant inductor and a second resonant capacitor connected in series. The second resonant inductor is coupled to the output terminal of the primary winding of the second transformer, and the second resonant capacitor is coupled to the output terminal of the primary winding of the third transformer. The third resonant slot includes a third resonant inductor and a third resonant capacitor connected in series. The third resonant inductor is coupled to the output terminal of the primary winding of the third transformer, and the third resonant capacitor is coupled to the output terminal of the primary winding of the first transformer.

8. The resonant converter according to claim 6, characterized in that, The resonant circuit includes: The first resonant slot includes a first resonant inductor and a first resonant capacitor. The first resonant inductor is coupled between the output terminal of the primary winding of the first transformer and the output terminal of the primary winding of the second transformer. The first resonant capacitor is coupled between the first output node of the primary switching circuit and the input terminal of the primary winding of the first transformer. The second resonant slot includes a second resonant inductor and a second resonant capacitor. The second resonant inductor is coupled between the output terminal of the primary winding of the second transformer and the output terminal of the primary winding of the third transformer. The second resonant capacitor is coupled between the second output node of the primary-side switching circuit and the input terminal of the primary winding of the second transformer. The third resonant slot includes a third resonant inductor and a third resonant capacitor. The third resonant inductor is coupled between the output terminal of the primary winding of the third transformer and the output terminal of the primary winding of the first transformer. The third resonant capacitor is coupled between the third output node of the primary switching circuit and the input terminal of the primary winding of the third transformer.

9. The resonant converter according to claim 6, characterized in that, The resonant circuit includes: The first resonant slot includes a first resonant inductor and a first resonant capacitor. The first resonant capacitor is coupled to the first output node of the primary-side switching circuit and the first resonant inductor. The first resonant inductor is coupled to the input terminal of the primary-side winding of the first transformer. The second resonant slot includes a second resonant inductor and a second resonant capacitor. The second resonant capacitor is coupled to the second output node of the primary-side switching circuit and the second resonant inductor. The second resonant inductor is coupled to the input terminal of the primary-side winding of the second transformer. The third resonant slot includes a third resonant inductor and a third resonant capacitor. The third resonant capacitor is coupled to the third output node of the primary-side switching circuit and the third resonant inductor. The third resonant inductor is coupled to the input terminal of the primary winding of the third transformer.

10. The resonant converter according to claim 6, characterized in that, The resonant circuit includes: The first resonant slot includes a first resonant inductor and a first resonant capacitor. The first resonant capacitor is coupled between the output terminal of the primary winding of the first transformer and the output terminal of the primary winding of the second transformer. The first resonant inductor is coupled between the first output node of the primary switching circuit and the input terminal of the primary winding of the first transformer. The second resonant slot includes a second resonant inductor and a second resonant capacitor. The second resonant capacitor is coupled between the output terminal of the primary winding of the second transformer and the output terminal of the primary winding of the third transformer. The second resonant inductor is coupled between the second output node of the primary-side switching circuit and the input terminal of the primary winding of the second transformer. The third resonant slot includes a third resonant inductor and a third resonant capacitor. The third resonant capacitor is coupled between the output terminal of the primary winding of the third transformer and the output terminal of the primary winding of the first transformer. The third resonant inductor is coupled between the third output node of the primary switching circuit and the input terminal of the primary winding of the third transformer.

11. The resonant converter according to claim 6, characterized in that, The secondary-side switching circuit includes: The first rectifier unit includes a seventh switch unit and an eighth switch unit connected in series. The first input node is located between the seventh switch unit and the eighth switch unit, and the first input node is coupled to the secondary winding of the first transformer. The second rectifier unit includes a ninth switching unit and a tenth switching unit connected in series, a second input node located between the ninth and tenth switching units, and the second input node coupled to the secondary winding of the second transformer; and The third rectifier unit includes an eleventh switch unit and a twelfth switch unit connected in series. The third input node is located between the eleventh switch unit and the twelfth switch unit, and the third input node is coupled to the secondary winding of the third transformer.

12. The resonant converter according to claim 1, characterized in that, The plurality of the resonant inductors and the plurality of the transformers are integrated into an integrated magnetic core module.

13. The resonant converter according to claim 12, characterized in that, The integrated magnetic core module includes an upper cover, a lower cover, a plurality of transformer core columns, a plurality of inductor core columns, and a common column. The plurality of transformer core columns, the plurality of inductor core columns, and the common column are disposed between the upper cover and the lower cover, and the plurality of transformer core columns and the plurality of inductor core columns are arranged around the common column.

14. The resonant converter according to claim 13, characterized in that, The distance between the plurality of transformer cores and the common post is the same, and the distance between the plurality of inductor cores and the common post is the same.

15. The resonant converter according to claim 13, characterized in that, The cross-sectional area of ​​each of the transformer core columns is the same as the cross-sectional area of ​​the common column.

16. The resonant converter according to claim 13, characterized in that, The cross-sectional areas of the plurality of the transformer core columns are equal.

17. The resonant converter according to claim 13, characterized in that, The distance between the plurality of transformer core columns is equal.

18. The resonant converter according to claim 13, characterized in that, The cross-sectional areas of the plurality of said inductor cores are equal.

19. The resonant converter according to claim 13, characterized in that, The distance between the plurality of said inductor cores is equal.

20. The resonant converter according to claim 13, characterized in that, The cross-sectional area of ​​the plurality of transformer cores is greater than the cross-sectional area of ​​the plurality of inductor cores.

21. The resonant converter according to claim 13, characterized in that, The air gap of the plurality of said inductor cores is greater than the air gap of the plurality of said transformer cores.

22. The resonant converter according to claim 13, characterized in that, The winding direction of the inductor coils of the plurality of resonant inductors may be the same as or different from the winding direction of the coils of the plurality of transformers.

23. The resonant converter according to claim 13, characterized in that, The plurality of transformer cores and the plurality of inductor cores are arranged alternately.

24. The resonant converter according to claim 23, characterized in that, The integrated magnetic core module includes a first resonant inductor, a second resonant inductor, a third resonant inductor, a first transformer, a second transformer, and a third transformer. The second resonant inductor is located between the first transformer and the second transformer, the third resonant inductor is located between the second transformer and the third transformer, and the first resonant inductor is located between the first transformer and the third transformer.

25. The resonant converter according to claim 23, characterized in that, The integrated magnetic core module includes a first resonant inductor, a second resonant inductor, a third resonant inductor, a first transformer, a second transformer, and a third transformer. The first resonant inductor is located between the first transformer and the second transformer, the second resonant inductor is located between the second transformer and the third transformer, and the third resonant inductor is located between the first transformer and the third transformer.

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