Design Methodology of Multi-Frequency Multi-Receiver Inductive Power Transfer System With High Power and High Efficiency

The multi-frequency multi-receiver inductively coupled wireless power transfer (IPT) technology can supply multiple loads with different frequencies simultaneously, and has great potential for application. However, traditional multi-frequency multi-receiver IPT systems suffer from redundancy, multiple operational constraints, complex design, and difficulty in compromising output power and transmission efficiency. In this paper, a novel multi-frequency compensation network topology is proposed, which reduces the redundancy of inverters and transmitting coils, and multiple frequencies do not have harmonic multiples with each other, improving frequency compatibility. Secondly, a design method for multi-frequency compensation network is proposed based on differential evolution algorithm and Lagrange multiplier method, which realizes design order-reduction of a multi-variable high-order compensation network, while maximizing output power and system efficiency, and considering the influence of inductance parasitic resistance. Finally, an experimental prototype was constructed based on the design scheme obtained by this method, and the sensitivity of parameters was analyzed. Experimental results show that the prototype is equipped with load-independence and constant voltage output characteristics without relying on control methods, with a measured system output power of 172.95W and an overall efficiency of 94.31%.