Abstract
This paper proposes a zero-voltage-switched resonant DC-DC converter. The converter enables parasitic components, including the transformer leakage inductance, switch output capacitance and diode junction capacitance to act as a part of the resonant components, which facilitates zero-voltage-switching operation and pushes up switching frequency. With the proposed resonant switch, the switch's voltage stress decreases compared with traditional multiresonant SEPIC converter. Synchronous rectification is employed to further improve the efficiency. The specific derivation of the resonant switch, mode analysis, and resonant parameters design method are presented. A prototype based on the proposed topology was built in the lab to verify the theoretical analysis.
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