Analysis of ICPT System with LCC Resonant Topology Based on the Switch-Controlled Capacitor

A double-sided LCC automatic resonant compensation topology based on the switch-controlled capacitor (SCC) is proposed in this paper. Inductively coupled power transfer (ICPT) and constant current and constant voltage charging mode are required for electric vehicle wireless charging of lithium batteries. The proposed circuit topology can solve the problem of the decrease in output capacity as well as unstable output voltage and output current in conventional ICPT circuit when the coefficient of electromagnetic coupling fluctuates or the load changes. Simulation and experimental results verify the theoretical analysis. Under the premise of efficient power transmission, constant voltage or current output is supported by the system when load changes, which improves the flexibility of resonant compensation topology and the stability of the system output, and it is applicable to electric vehicle wireless charging.