Output DC Voltage Stabilizer and Efficiency Improvement in Wireless Power Tranfer Systems

Abstract

In recent years, Wireless Power Transfer (WPT) technology has received remarkable attention because of its wide range of applications. To control the output voltage and maximize the efficiency of the system under variable conditions, primary-side phase shift H-bridge inverter and secondary-side semiactive rectifier are simultaneously utilized in this paper. The system with a two-sided LCC compensation network brings about a power of 2.5 kW, working frequency at 40 kHz and a transfer distance of 4.5 cm. Besides, the study suggests a formula to estimate the output power and calculate the tranfer power value needed to supply. This power controller uses phase-shift modulation method to help the system achieve maximum efficiency. To verify the theory above, the system is implemented on PSIM software and experimentally. A stable 400 V on the load is achieved with 2.3% control error, and the transfer efficiency is improved up to 90.9%.