A Novel Non-Isolated Dual-Input Single-Output High Step-Up DC/DC Converter With Coupled Inductors

Abstract

This paper proposes a novel non-isolated dual-input single-output high step-up DC/DC converter with coupled inductor (NI-DISO-CI) for the distributed sources. The coupled inductor along with the passive clamp circuits is employed to the NI-DISO-CI, which can achieve the high voltage conversion ratio without operating at an extremely duty cycle. The energy stored in leakage inductor is recycled by the passive clamp circuits, which can minimize the voltage spikes across power switches. Therefore, the power switches with low parasitic parameters can be selected. And the power switches can achieve the zero current switching (ZCS) performance by utilizing the leakage inductor from coupled inductor. The operating principle, steady-state analysis, design and performance of the NI-DISO-CI are described in detail. Finally, the experimental prototype with the switching frequency of 100 kHz and the power rating of 400W is built to verify the accuracy of the theoretical analysis.