The performance analysis of three types of compensation topologies for high-frequency wireless power transfer system

Abstract

Electromagnetic coupled resonant wireless power transfer (WPT) technology can realize the soft connection of energy and has received extensive attention in recent years. To reduce the volume of the device and further improve the operating frequency and efficiency of the system, this paper proposed to build a high-frequency WPT using silicon carbide (SiC) MOSFET. Based on the two-port network and the T-model equivalent circuit, the mathematical model of the resonant circuit is obtained. The transmission characteristics of series–series (SS), double-sided LCL and double-sided LCC resonant circuits are analyzed at high-frequency. The studies show that under the same circuit parameters, the double-sided LCC resonant circuit has a stronger carrying capacity while maintaining high transmission efficiency, which solves the problem of the small transmission power of double-sided LCL. Finally, a double-sided LCC type WPT experimental prototype with an operating frequency of 600kHz, an input voltage of 48V, an input power of 600W and transmission efficiency of ≥ 90% was built. Which provides a reference for the design of high-frequency WPT and the analysis of resonant circuits.