Soft Switching Interleaved High Step-Up Converter With Multifunction Coupled Inductors

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Abstract
This paper presents an efficient interleaved soft switching DC-DC converter for high step-up applications. In the proposed converter, two multi-function coupled inductors are employed to increase the voltage gain, accomplish soft switching operation for all semiconductors in a wide range of load variations, and smooth the input current. Besides, the leakage inductance energy is recovered to enhance the voltage gain and efficiency while assisting soft switching condition for the switches and diodes. In addition, no auxiliary switch or extra magnetic element are employed in the proposed converter while the voltage stress of switches and diodes is rather low. These have led to simple structure, high density, low cost and improved efficiency. Theoretical analysis and design considerations for the proposed converter are presented. Moreover, the experimental results of a 48 V to 500 V laboratory prototype approve the effectiveness of the proposed topology.

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