Research on a technique of wireless power transfer based on semi-bridge rectifier

Abstract

This paper proposed a technique of maximum efficiency and constant voltage output for wireless power transfer system. A semi-bridge rectifier is used to replace the common diode rectifier on the receiver side, and a Boost circuit is adopted to regulate the system output voltage. The duty cycles of the semi-bridge rectifier and the Boost circuit are online adjusted so that the wireless power transfer system can keep both maximum efficiency and constant voltage output when load varies and mutual inductance of coupled coils changes. Experimental results verified the feasibility of the proposed technique and the correctness of the theoretical analysis.

Keywords

• wireless power transfer; maximum efficiency; constant voltage output