Patent US10291139

Two-transformer three-phase DC-DC resonant converter
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US10291139

1. A transformer circuit, comprising: (2) (4)

a first transformer;

a second transformer, a first terminal of the first transformer being coupled to a first terminal of the second transformer;

an inductor coupled between a second terminal of the first transformer and a second terminal of the second transformer; and

a secondary side configured to deliver a three-phase power output using only two transformers, the two transformers comprising the first transformer and the second transformer, and the secondary side comprising: a first output node formed by a third terminal of the first transformer;

a second output node formed by coupling a fourth terminal of the first transformer and a fourth terminal of the second transformer; and

a third output node formed by a third terminal of the second transformer.

2. The transformer circuit of claim 1, further comprising a primary side configured to receive a three-phase power input, and the primary side comprising: (2) (3)

a first input node formed by coupling the second terminal of the first transformer and a first terminal of the inductor;

a second input node formed by coupling the first terminal of the first transformer and the first terminal of the second transformer; and

a third input node formed by coupling the second terminal of the second transformer and a second terminal of the inductor.

3. The transformer circuit of claim 2, wherein the first input node is configured to receive a first phase of the three-phase power input, the second input node is configured to receive a second phase of the three-phase power input, and the third input node is configured to receive a third phase of the three-phase power input. (0)

4. The transformer circuit of claim 2, wherein the primary side of the transformer circuit is coupled to a resonant tank circuit to receive the three-phase power input. (1) (0)

6. The transformer circuit of claim 1, wherein the secondary side is coupled to a three-phase rectifier circuit to deliver the three-phase power output, the first output node is coupled to a first branch of the three-phase rectifier circuit, the second output node is coupled to a second branch of the three-phase rectifier circuit, and the third output node is coupled to a third branch of the three-phase rectifier circuit. (0)

7. A resonant converter circuit, comprising: (1) (2)

a resonant tank circuit; and

a transformer circuit coupled to the resonant tank circuit, the transformer circuit comprising: a first transformer;

a second transformer, a first terminal of the first transformer being coupled to a first terminal of the second transformer;

an inductor coupled between a second terminal of the first transformer and a second terminal of the second transformer, the resonant tank circuit being coupled to a primary side of the transformer circuit; and

a second output node formed by coupling a fourth terminal of the first transformer and a fourth terminal of the second transformer; and

a third output node formed by a third terminal of the second transformer.

8. The resonant converter circuit of claim 7, wherein the resonant tank circuit comprises: (1) (3)

a first branch coupled to a first input node of the transformer circuit;

a second branch coupled to a second input node of the transformer circuit; and

a third branch coupled to a third input node of the transformer circuit.

9. The resonant converter circuit of claim 8, wherein the first branch is coupled between a first input node of the resonant tank circuit and the first input node of the transformer circuit, the second branch is coupled between a second input node of the resonant tank circuit and the second input node of the transformer circuit, and the third branch is coupled between a third input node of the resonant tank circuit and the third input node of the transformer circuit. (1) (0)

11. A three-phase resonant direct current-direct current (DC-DC) converter system, comprising: (1) (3)

a primary side;

a secondary side; and

a transformer circuit coupled between the primary side and the secondary side, the transformer circuit comprising: a first transformer;

a second transformer, a first terminal of the first transformer being coupled to a first terminal of the second transformer,

an inductor coupled between a second terminal of the first transformer and a second terminal of the second transformer; and

a second output node formed by coupling a fourth terminal of the first transformer and a fourth terminal of the second transformer; and

a third output node formed by a third terminal of the second transformer.

12. The three-phase resonant DC-DC converter system of claim 11, wherein the primary side comprises a DC voltage input circuit configured to receive a DC input voltage, a resonant tank circuit is coupled to the transformer circuit to provide a three-phase power input to the transformer circuit, and a switching circuit is coupled between the DC voltage input circuit and the resonant tank circuit. (1) (0)

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Patent US10291139

Two-transformer three-phase DC-DC resonant converter

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