Comparative Analysis of Symmetrical and Asymmetrical Phase Shift Control Strategy for Resonant Wireless Inductive Charging System

Abstract

This paper describes the operation and performance analysis of series/series resonant wireless inductive charging system with symmetrical phase shift (SPS) and asymmetrical phase shift (APS) control strategies. The H-bridge inverter switches of the resonant wireless inductive charging system (RWICS) are designed to operate with zero voltage switching. The comparison of the SPS, APS switching strategies are discussed in regulation of output voltage for different loading conditions and step change in the reference voltages. It is found that the system efficiency is higher with APS control strategy. Also, the variation in pulse-width angle required for controlling the output voltage is small for various loading conditions in APS compared to the SPS. The MATLAB/Simulink Simulation results confirmed that APS control strategy provides superior performance than SPS control for different loading and different output desired conditions. © 2021 IEEE.