Analysis and design of wireless power transfer system based on inductor-capacitor-capacitor/none magnetic integration compensation circuit

摘要

This paper presents the analysis and design of the wireless power transfer (WPT) system based on the inductor-capacitor-capacitor/none (LCC/N) magnetic integration compensation circuit. Compared with the traditional compensation circuits, the proposed LCC/N compensation circuit features the magnetic integration and the secondary side without compensation network, which makes the WPT system more compact. First, the fundamental-harmonic model considering the coupling relationship among magnetically integrated compensation inductor, transmitter coil, and receiver coil is established. Then, the reactive power and turn-off current of the inverter, transmission power, and efficiency of the WPT system employing LCC/N compensation circuit are analyzed with varied coupling coefficient and load. Furthermore, based on the characteristics analysis of the LCC/N topology, the parameter design criterion of the LCC/N compensation circuit is given. Finally, the analysis and design of the WPT system based on the LCC/N magnetic integration compensation circuit are verified by simulations and experiments. The results show that the characteristics analysis of the WPT system employing the LCC/N compensation circuit is accurate, the inverter can realize zero-voltage-switch (ZVS) and the WPT system can achieve the rated power of 1 kW under different offset distances of coils and reach the maximum efficiency of 95.3%.