Abstract
A new high step-up dc-dc converter suitable for fuel cell power interface is presented in this paper. The proposed converter features multi-resonant tank for achieving high-step up ratio under zero current soft switching without any snubber circuits. The simple and minimized-component topology contributes for Mega-hertz driving of Gallium Nitride (GaN) under the condition of reduced switching loss, electromagnetic emission interference (EMI) noise, and ripple-free dc input current. Mode-transitional power stages are described by in-depth manner, after which the high step-up principle is revealed in a frequency-domain analysis. The essential performances of the proposed topology are demonstrated by simulation and experiment of 1.8 MHz-120 W prototype, whereby the effectiveness of snubberless and multi-resonant topology are verified from the practical point of view..
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