Topology Optimization and Design Realization of Magnetically-Coupled Resonant Wireless Power Transfer System with LCL-S Structure

Abstract

Magnetically-coupled resonant wireless power transfer (MCR-WPT) system with LCL-S structure is developing for higher transmission characteristics. This paper improves the resonance topology structure by adding a compensation capacitor in the transmitting side and proposes a parameter configuration method with equivalent impedance. The transmission characteristics are analyzed first based on simulation method to determine the parameters for the system requirements of 3 kW output power at working frequency of 85 kHz. Then the improved MCR-WPT system is developed. The realization methods of key modules such as electromagnetic coupling mechanism and drive circuit are given. The experiments are designed and are used to analyze the effect of different frequency and different distance on transmission characteristics. Output power and transmission efficiency of the designed system can be 3141 W and 91% respectively. In addition, the inverter’s performance and the system electromagnetic radiation state are evaluated. The results show that the designed system can provide an effective means for 3 kW WPT application at 85 kHz.