I. Introduction
IT is one of the hot topics to operate a dc/dc converter with high conversion efficiency over a wide input/output voltage range for applications such as renewable energy, battery and communication power system. For example, in a satellite power system that is sourced by a photovoltaic (PV) array and a battery, the output voltage of the PV may fluctuate by over 100% due to the variation of environment and the battery voltage also varies in a wide range, depending on the state of charge.