Investigation of High Frequency Lossless Step-up DC-DC Switching Converter Employing Electronic PI-Controller

Abstract

In this paper, a high frequency Soft-switching Step-up DC-DC converter is proposed with a trouble-free auxiliary resonant circuit, which is composed of an auxiliary switch, a diode, a resonant inductor, and a resonant capacitor. The conventional Step-up converter decreases the efficiency because of Hard-switching, which generates losses when the switches are turned ON/OFF. During this interval, all switches in the adopted circuit perform Zero-Current Switching (ZCS) by the resonant inductor at turn-ON, and Zero-Voltage Switching (ZVS) by the resonant capacitor at turn-OFF. This switching pattern can reduce the switching losses, voltage and current stress of the switching device. In this work, we have analysed the operational modes of the adopted Soft-switching Step-up converter with closed-loop control mode using Electronic PI-controller. The adopted Soft-switching Step-up converter is simulated by PSIM software. The results obtained are presented to verify the effectiveness of the proposed circuit.