Enhancing Efficiency in Multireceiver Wireless Charging With Voltage Constraints Using Two-Stage Optimization Algorithm

This article proposes an optimization method to maximize the transmission efficiency of multireceiver wireless power transfer (WPT) system while satisfying the load voltage output at the receivers. This method takes the duty cycle of the full bridge inverter at the transmitter and the boost ratio of the dc–dc converters as optimization variables. First, based on the consideration of rectifier circuits and dc–dc converters, a circuit analysis is conducted on the multireceiver WPT system, and the calculation formula for load voltage and system transmission efficiency is obtained. Second, the problem is transformed into an optimization problem with conditional constraints, and a two-stage optimization algorithm combining genetic algorithm and interior point method is designed to ensure the achievement of a stable global optimal solution. Finally, the study determines the duty cycle of the inverter and the receiver voltage boost ratio that satisfy specified constraints when maximizing efficiency. Validation of the output voltage and transmission efficiency across a wide voltage range and under various load conditions is performed on a physical platform.