CN-224233556-U - Resonant converter

Abstract

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 the plurality of transformers of the transformer circuit includes a primary side winding and a secondary side winding. The primary windings are coupled to each other by a star connection and the secondary windings are coupled to each other by a delta connection. The secondary side switch circuit is coupled with the transformer circuit and comprises a plurality of input nodes. The plurality of input nodes are coupled to the secondary winding of the transformer circuit by star connection. The application reduces the magnetic core loss through the configuration of a plurality of resonant tanks and transformers, has good current balance effect, and achieves the effect of reducing the overall loss of the power supply circuit.

Inventors

• Qiu Bairui
• ZENG CHENGWEI
• CHEN ZHEN

Assignees

• 光宝科技股份有限公司

Dates

Publication Date

20260512

Application Date

20250516

Priority Date

20250214

Claims (20)

1. 1. A resonant type converter, which comprises a first circuit board and a second circuit board, characterized by comprising the following steps: An input circuit for providing an input voltage; a primary side switch circuit coupled to the input circuit and including a plurality of output nodes; The resonant circuit is electrically connected with the primary side switch circuit and comprises a plurality of resonant tanks, and each resonant tank comprises 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 and an output, the plurality of primary windings being coupled to each other in a star connection, the plurality of secondary windings being coupled to each other in a delta connection; a secondary side switch circuit coupled to the transformer circuit and including a plurality of input nodes coupled to the secondary side windings of the transformer circuit via a star connection, and And the output circuit is coupled with the secondary side switching circuit and generates output voltage.
2. 2. The resonant converter of claim 1, wherein the primary side switching circuit comprises: The first bridge arm comprises a first switch unit and a second switch unit which are connected in series, and a first output node is positioned between the first switch unit and the second switch unit; A second bridge arm including a third switch unit and a fourth switch unit connected in series, a second output node between the third switch unit and the fourth switch unit, and The third bridge arm comprises a fifth switch unit and a sixth switch unit which are connected in series, and a third output node is positioned between the fifth switch unit and the sixth switch unit.
3. 3. The resonant converter of claim 2, wherein control signals of the first and second switching units are complementary to each other, control signals of the third and fourth switching units are complementary to each other, and control signals of the fifth and sixth switching units are complementary to each other.
4. 4. A resonant converter according to claim 3, characterized in that there is a first dead time between the control signal of the first switching unit and the control signal of the second switching unit, between the control signal of the third switching unit and the control signal of the fourth switching unit and between the control signal of the fifth switching unit and the control signal of the sixth switching unit.
5. 5. The resonant converter of claim 2, wherein a phase difference between the control signal of the first switching unit and the control signal of the third switching unit is 120 degrees, and wherein a phase difference between the control signal of the third switching unit and the control signal of the fifth switching unit is 120 degrees.
6. 6. The resonant converter of claim 1, wherein the transformer circuit comprises a first transformer, a second transformer, and a third transformer, the output of the primary side winding of the first transformer, the output of the primary side winding of the second transformer, and the output of the primary side winding of the third transformer being coupled with the resonant circuit.
7. 7. The resonant converter of claim 6, wherein the resonant circuit comprises: The first resonant tank comprises a first resonant inductor and a first resonant capacitor which are connected in series, wherein the first resonant inductor is coupled with the output end of the primary side winding of the first transformer, and the first resonant capacitor is coupled with the output end of the primary side winding of the second transformer; A second resonant tank including a second resonant inductor and a second resonant capacitor connected in series with each other, the second resonant inductor being coupled to the output terminal of the primary winding of the second transformer, the second resonant capacitor being coupled to the output terminal of the primary winding of the third transformer, and The third resonant tank comprises a third resonant inductor and a third resonant capacitor which are connected in series, wherein the third resonant inductor is coupled with the output end of the primary side winding of the third transformer, and the third resonant capacitor is coupled with the output end of the primary side winding of the first transformer.
8. 8. The resonant converter of claim 6, wherein the resonant circuit comprises: A first resonant tank including a first resonant inductance and a first resonant capacitance, the first resonant inductance 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 capacitance coupled between a first output node of the primary switching circuit and the input terminal of the primary winding of the first transformer; a second resonant tank including a second resonant inductor and a second resonant capacitor, the second resonant inductor being 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 being coupled between a second output node of the primary switching circuit and the input terminal of the primary winding of the second transformer, and The third resonant tank comprises a third resonant inductor and a third resonant capacitor, wherein the third resonant inductor is coupled between the output end of the primary side winding of the third transformer and the output end of the primary side winding of the first transformer, and the third resonant capacitor is coupled between a third output node of the primary side switching circuit and the input end of the primary side winding of the third transformer.
9. 9. The resonant converter of claim 6, wherein the resonant circuit comprises: The first resonant tank comprises a first resonant inductor and a first resonant capacitor, the first resonant capacitor is coupled with a first output node of the primary side switch circuit and the first resonant inductor, and the first resonant inductor is coupled with the input end of the primary side winding of the first transformer; A second resonant tank including a second resonant inductor and a second resonant capacitor, the second resonant capacitor coupled to a second output node of the primary side switching circuit and the second resonant inductor, the second resonant inductor coupled to the input of the primary side winding of the second transformer, and The third resonant tank comprises a third resonant inductor and a third resonant capacitor, the third resonant capacitor is coupled with a third output node of the primary side switch circuit and the third resonant inductor, and the third resonant inductor is coupled with the input end of the primary side winding of the third transformer.
10. 10. The resonant converter of claim 6, wherein the resonant circuit comprises: A first resonant tank including a first resonant inductor and a first resonant capacitor, the first resonant capacitor 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 coupled between a first output node of the primary switching circuit and the input terminal of the primary winding of the first transformer; A second resonant tank including a second resonant inductor and a second resonant capacitor, the second resonant capacitor being 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 being coupled between a second output node of the primary switching circuit and the input terminal of the primary winding of the second transformer, and The third resonant tank comprises a third resonant inductor and a third resonant capacitor, wherein the third resonant capacitor is coupled between the output end of the primary side winding of the third transformer and the output end of the primary side winding of the first transformer, and the third resonant inductor is coupled between a third output node of the primary side switching circuit and the input end of the primary side winding of the third transformer.
11. 11. The resonant converter of claim 6, wherein the secondary side switching circuit comprises: The first rectifying unit comprises a seventh switching unit and an eighth switching unit which are connected in series, a first input node is positioned between the seventh switching unit and the eighth switching unit, and the first input node is coupled with the secondary side winding of the first transformer; A second rectifying unit including a ninth switching unit and a tenth switching unit connected in series, a second input node between the ninth switching unit and the tenth switching unit, the second input node coupled with the secondary winding of the second transformer, and The third rectifying unit comprises an eleventh switching unit and a twelfth switching unit which are connected in series, a third input node is positioned between the eleventh switching unit and the twelfth switching unit, and the third input node is coupled with the secondary side winding of the third transformer.
12. 12. The resonant converter of claim 1, wherein a plurality of the resonant inductors and a plurality of the transformers are integrated into an integrated core module.
13. 13. The resonant converter of claim 12, wherein the integrated magnetic core module comprises an upper cover, a lower cover, a plurality of transformer legs, a plurality of inductor legs, and a common leg, the plurality of transformer legs, the plurality of inductor legs, and the common leg are disposed between the upper cover and the lower cover, and the plurality of transformer legs and the plurality of inductor legs are disposed around the common leg.
14. 14. The resonant converter of claim 13, wherein a plurality of the transformer studs are the same distance from the common stud and a plurality of the inductor studs are the same distance from the common stud.
15. 15. The resonant converter of claim 13, wherein a cross-sectional area of a plurality of the transformer core legs is the same as a cross-sectional area of the common leg.
16. 16. The resonant converter of claim 13, wherein the cross-sectional areas of a plurality of the transformer core pins are equal.
17. 17. The resonant converter of claim 13, wherein distances between a plurality of the transformer legs are equal.
18. 18. The resonant converter of claim 13, wherein the plurality of inductor studs have equal cross-sectional areas.
19. 19. The resonant converter of claim 13, wherein the distances between the plurality of inductor pins are equal.
20. 20. The resonant converter of claim 13, wherein a cross-sectional area of a plurality of the transformer core legs is greater than a cross-sectional area of a plurality of the inductor core legs.

Description

Resonant converter Technical Field The present disclosure relates to power converters, and particularly to a resonant converter. Background In the application scenarios of low voltage and high current such as charging piles, energy storage systems, artificial intelligence servers, etc., power supply circuits are often implemented using a three-phase interleaved topology to distribute current stress. The power supply circuit basically includes magnetic elements such as a transformer and an inductor, and the magnetic elements are subjected to a magnetic field to generate loss. In addition, when characteristic errors exist between circuit elements, unbalanced states occur in the currents of the respective phases, which also results in an increase in the overall loss of the power supply circuit. Therefore, how to effectively reduce the overall loss of the power supply circuit is one of the problems to be solved in the art. Disclosure of utility model In order to solve the above-mentioned problems, the present application provides a resonant converter, which has a good current balancing effect, and reduces the core loss, thereby achieving the effect of reducing the overall loss of the power circuit. In order to achieve one of the above objects, the present application provides a resonant converter, which includes an input circuit, a primary side switch circuit, a resonant circuit, a transformer circuit, a secondary side switch circuit and an output circuit. The input circuit is used for providing an input voltage. The primary side switch circuit is coupled to the input circuit and comprises a plurality of output nodes. The resonant circuit is electrically connected with the primary side switch circuit and comprises a plurality of resonant grooves. Each of the plurality of resonant tanks includes a plurality of resonant inductors. The transformer circuit is coupled with the resonant circuit. The transformer circuit has a plurality of transformers, each of the plurality of transformers including a primary side winding and a secondary side winding. The plurality of primary windings includes an input and an output. The plurality of primary windings are coupled to each other by a star connection, and the plurality of secondary windings are coupled to each other by a delta connection. The secondary side switch circuit is coupled with the transformer circuit and comprises a plurality of input nodes. The input nodes are coupled with the secondary windings of the transformer circuit in a star connection mode. The output circuit is coupled with the secondary side switch circuit and generates output voltage. Based on the above, the resonant converter of the present application can reduce the core loss through the configuration of the plurality of resonant tanks and the transformer, and can have a good current balance effect when the circuit element has a characteristic error, so as to achieve the effect of reducing the overall loss of the power circuit. Drawings The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings: FIG. 1 is a schematic diagram of a power circuit according to an embodiment of the application; FIG. 2 is a schematic diagram of an embodiment of a resonant converter according to an embodiment of the application; FIG. 3 is a schematic diagram of a resonant converter according to an embodiment of the application; FIG. 4 is a schematic diagram illustrating an embodiment of a resonant converter according to an embodiment of the present application; FIG. 5 is a schematic diagram of an embodiment of a resonant converter according to an embodiment of the present application; FIG. 6 is a schematic diagram of an embodiment of a control signal according to an embodiment of the present application; FIG. 7 is a dead time embodiment schematic according to an embodiment of the present application; FIG. 8 is a diagram illustrating a control signal according to an embodiment of the present application; FIG. 9A is a graph showing an error comparison of three phase currents according to an embodiment of the present application; FIG. 9B is a second error comparison plot of three-phase currents according to an embodiment of the present application; FIG. 9C is a third error comparison plot of three phase currents according to an embodiment of the present application; FIG. 10A is a schematic illustration of an embodiment of an integrated core module according to an embodiment of the present application; FIG. 10B is a schematic diagram of an embodiment of an integrated core module according to an embodiment of the present application; FIG. 10C is a schematic diagram of an embodiment of an integrated core module according to an embodiment of t