Abstract
This paper presents a modulation strategy for bidirectional power flow for the step voltage switched (SVS) secondary side phase-shifted (SPS) DC-DC converter that eliminates the device voltage overshoot problem. The voltage overshoot problem arises due to the resonance between transformer leakage inductance and the output capacitance of the current-fed side MOSFETs of the converter. Many snubber/clamp circuits were discussed in the literature to suppress this voltage overshoot. But the power loss in these clamp circuits will affect the converter efficiency. The bidirectional SVS SPS DC-DC converter presented in this paper eliminates the voltage overshoot problem instead of suppressing it and therefore nullifies the need for a voltage clamp circuit. And most of all switching devices undergo soft-switching (either ZVS or ZCS). These factors result in achieving a peak efficiency of 96%. The proposed topology is tested for 1.7KW at 100KHz switching frequency with voltage-fed side voltage being 72V and current-fed side voltage of 400V. The results obtained prove the feasibility of the proposed work.
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