Modeling and design of control loop with semi-bridgeless rectifier in wireless charging system

Abstract

This paper focuses on the design of secondary control loop in wireless EV charging system according to model calculation instead of empirical estimation or simulation attempt. To simplify the structure of secondary circuit, semi-bridgeless active rectifier is used. The analysis and modeling of semi- bridgeless active rectifier is completed by small-signal modeling method. The secondary control loop with quick response and high stability is designed based on Bode plot analysis of the open- loop system. The response time to 80% output power change is less than 2 ms with less than 10% disturbance in resonant circuits. The principle verification is completed by simulation of the designed control loop in wireless charging system.