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Keywords

coupled inductor; high voltage gain; soft-switching; DC-DC converter

Abstract

To solve the problem of voltage mismatch among photovoltaic systems, fuel cells, and high-voltage direct current (DC) buses, a soft-switching high voltage gain DC-DC converter based on a coupled inductor is proposed, which is suitable for non-isolated input-output scenarios. First, the working principle of the converter is analyzed, and the voltage gain of the converter is derived; then, the soft-switching characteristics and voltage stress are analyzed, and a comparison of parameters and characteristics with other converters is provided. Finally, an experimental prototype with an input of 25‒35 V, an output of 200 V, and a power of 500 W is built to verify the effectiveness of the topology and theory. Based on the traditional Boost converter, this converter magnetically couples the Boost inductor with the auxiliary circuit inductor and utilizes the leakage inductance of the coupled inductor and the resonant capacitor to form a resonant tank. It can not only achieve a high voltage gain under non-extreme duty cycle conditions but also effectively reduce the number of magnetic cores and lower the capacitance value. All switches of this converter achieve zero-voltage turn-on, and all diodes achieve zero-current turn-off, which effectively mitigates the reverse recovery problem of the diodes and improves the overall efficiency.

DOI

10.19781/j.issn.1673-9140.2026.02.026

First Page

293

Last Page

303

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