Resonant converter and resonant conversion circuitry

A resonant conversion circuitry, comprising:

• a first resonant converter comprising a first front-stage conversion circuit and a first resonant transformer circuit, wherein the first front-stage conversion circuit is configured to generate a first voltage according to a plurality of first front-stage control signals;
• wherein the first resonant transformer circuit is coupled to the first front-stage conversion circuit, and is configured to convert the first voltage into a second voltage;
• and
• a second resonant converter comprising a second front-stage conversion circuit and a second resonant transformer circuit, wherein the second front-stage conversion circuit is configured to generate a third voltage according to a plurality of second front-stage control signals;
• wherein the second resonant transformer circuit is coupled to the second front-stage conversion circuit, and is configured to convert the third voltage into a fourth voltage, and the second resonant transformer circuit is further coupled to the first resonant transformer circuit;
• and
• wherein the plurality of first front-stage control signals and the plurality of second front-stage control signals are interleaved with each other;
• wherein the first resonant converter further comprises a first back-stage conversion circuit, the first back-stage conversion circuit is coupled to the first resonant transformer circuit;
• wherein the first resonant transformer circuit comprises a plurality of first primary windings and a plurality of first secondary windings, and the second resonant transformer circuit comprises a plurality of second primary windings and a plurality of second secondary windings;
• wherein a first portion of the plurality of first secondary windings are coupled to each other, a first portion of the plurality of second secondary windings are coupled to each other, and a second portion of the plurality of first secondary windings is coupled to a second portion of the plurality of second secondary windings.

A resonant conversion circuitry, comprising:

• a first resonant converter comprising:
• a first front-stage conversion circuit comprising a plurality of first front-stage bridge arm units, and configured to output a first voltage;
• a first resonant transformer circuit coupled to the plurality of first front-stage bridge arm units, and configured to convert the first voltage into a second voltage;
• and
• a first back-stage conversion circuit coupled to the first resonant transformer circuit, and comprising a plurality of first back-stage bridge arm units;
• and
• a second resonant converter comprising:
• a second front-stage conversion circuit comprising a plurality of second front-stage bridge arm units, and configured to output a third voltage;
• a second resonant transformer circuit coupled to the plurality of second front-stage bridge arm units, and configured to convert the third voltage into a fourth voltage;
• and
• a second back-stage conversion circuit coupled to the second resonant transformer circuit, and comprising a plurality of second back-stage bridge arm units;
• and
• a state selection circuit coupled to the first resonant converter and the second resonant converter, and configured to selectively connect the first resonant converter and the second resonant converter in series, or connect the first resonant converter and the second resonant converter in parallel;
• wherein the first back-stage conversion circuit further comprises a plurality of first multi-level switching elements, and the first resonant converter further comprises:
• a switching circuit coupled to the first back-stage conversion circuit, and configured to selectively change a plurality of connection positions of the plurality of first back-stage bridge arm units, so that the first back-stage conversion circuit converts the second voltage into a first direct current power by the plurality of first back-stage bridge arm units instead of by the plurality of first multi-level switching elements, or the first back-stage conversion circuit converts the second voltage into a second direct current power by the plurality of first back-stage bridge arm units and the plurality of first multi-level switching elements.