Abstract
This paper proposes a novel zero-current switching (ZCS) variable frequency controlled resonance pulse based current-fed full-bridge DC-DC converter for energy storage applications. The proposed converter enables soft-commutation at device turn-off by utilizing resonance between transformer leakage inductance and a series capacitor. Existing current-fed converters experience turn-off voltage spikes and uses several methods to achieve soft switching which further increases circulating current and limit soft commutation at light-loads. To address these limitations, series LC resonance pulse structure has been proposed where variable frequency control with variable duty is employed to achieve ZCS operation over wide range of load and input variations. Operation of the proposed converter is presented and validated with simulation and experimental results.
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