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This paper proposes a soft-switched single switch isolated converter. The proposed converter is able to offer low cost and high power density in step up application due to the following features: ZCS turn-on and ZVS turn-off of switch and ZCS turn-off of diodes regardless of voltage and load variation; low rated lossless snubber; reduced transformer volume compared to flyback based converters due to low magnetizing current. Experimental results on a 100kHz, 250W prototype are provided to validate the proposed concept.Index Terms-Isolated step-up dc-dc converter, single switch, soft switching. 0885-8993 (c)

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