Extra Wide Input Voltage Range and High Efficiency DC-DC Converter Using Hybrid Modulation

Abstract

In this paper an interleaving phase shift modulating (PSM) control strategy for DC-DC converter is proposed based on two conventional PWM half bridge converters. A new rectifier structure suitable to the interleaving technique is proposed. With the proposed hybrid control method (PSM and PWM) and the proposed rectifier structure the DC transfer gain of the converter can be improved. Therefore, it can be employed in a wide input voltage application to reduce the current stress and conduction loss in primary. According to the proposed control strategy, a new rectifier structure is proposed to reduce the voltage stress of the diode and the filter requirement. Based on the proposed converter, a cell structure concept is proposed. Using this cell structure a multi-phase converter can be constructed with any wide input voltage range. A two phase prototype (100k/500W) is built to verify the theoretical analysis