A New Ultra High-Gain DC/DC Converter with Full Soft-Switching Performance and Low Voltage Stress

Subject Areas : Power Engineering

Sara Hasanpour ¹ (Department of Electrical Engineering, Ramsar Branch, Islamic Azad University, Ramsar, Mazandaran, Iran)
Amard Afzalian ² (Department of Electrical Engineering, Ramsar Branch, Islamic Azad University, Ramsar, Mazandaran, Iran)
Tohid Nouri ³ (Department of Electrical Engineering, Sari Branch, Islamic Azad University, Sari, Mazandaran, Iran)

Received: 2024-03-08 Accepted : 2024-03-31 Published : 2024-12-20

Keywords: Step-up DC-DC converter, Coupled-inductor, Continuous input current, Trans-inverse, Soft-switching,

Abstract :

This paper presents a new single-switch Ultra High-Gain DC/DC converter for renewable energy applications. This converter is able to provide a high voltage gain in a low-duty cycle, low input current ripple, and low voltage stress. Moreover, a coupled inductor with three windings is utilized to extend the voltage gain, which indicates more converter flexibility. Also, the secondary winding of the coupled inductor acts in a trans-inverse manner. Thus, at a lower number of turn ratios, higher voltage gains can be achieved. A regenerative passive clamp circuit absorbs and recycles the energy of the leakage energy of the coupled inductor. The single-power MOSFET operates at zero current switching conditions with restricted voltage stress. In this circuit, because of the soft-switching operation for the power switch and diodes, the power dissipations have been alleviated considerably. Detailed steady-state and power loss analyses, as well as design considerations, are provided. Finally, to confirm the given theories a sample prototype (200 W, 25 V- 400 V) is implemented. Regarding the experimental results, the proposed converter efficiency is about 96.2%, and the maximum voltage stress across the power switch is limited to about 15% output DC voltage.

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