A novel step-up dc-dc converter is presented in this paper, which is suitable for obtaining a high dc-dc voltage ratio. The proposed dc-dc converter features the snubberless zero current soft-switching (ZCS) commutation with MHz high frequency driving of GaN-HEMT by adopting quasi resonance and dual parallel load resonance; multi-resonant while minimizing the number of semiconductor power devices. The circuit configuration and operation principle are described together with briefing the switch-mode transitions. A frequency-domain analysis is provided on the basis of the equivalent circuit, and the design guideline is revealed. The essential operation of the proposed dc-dc converter is demonstrated by experiment results of 1-2MHz/120W prototype.
