High-Efficiency DC–DC Converter With Two Input Power Sources

The aim of this study is to develop a high-efficiency converter with two input power sources for a distributed power generation mechanism. The proposed converter can boost the varied voltages of different power sources in the sense of hybrid power supply to a stable output dc voltage for the load demand. An auxiliary circuit in the proposed converter is employed for achieving turn-ON zero-voltage switching (ZVS) of all switches. According to various situations, the operational states of the proposed converter can be divided into two states including a single power supply and a dual power supply. In the dual power-supply state, the input circuits connected in series together with the designed pulsewidth modulation can greatly reduce the conduction loss of the switches. In addition, the effectiveness of the designed circuit topology and the ZVS properties are verified by experimental results, and the goal of high-efficiency conversion can be obtained.