A Double-Sided LCC Compensation Network and Its Tuning Method for Wireless Power Transfer

TLDR

The paper proposes a double‑sided LCC compensation network and a tuning method for wireless power transfer. The authors analyze the network in the frequency domain and propose a tuning method that achieves zero‑voltage switching for the primary‑side switches. The proposed network achieves a resonant frequency independent of coupling and load, enabling constant switching frequency, and experiments demonstrate a 7.7 kW EV charging system with 96 % efficiency.

Abstract

This paper proposes a double-sided LCC compensation network and its tuning method for wireless power transfer (WPT). With the proposed topology and its tuning method, the resonant frequency is irrelevant with the coupling coefficient between the two coils and is also independent of the load condition, which means that the system can work at a constant switching frequency. Analysis in frequency domain is given to show the characteristics of the proposed method. We also propose a method to tune the network to realize zero voltage switching (ZVS) for the Primary-side switches. Simulation and experimental results verified analysis and validity of the proposed compensation network and the tuning method. A wireless charging system with output power of up to 7.7 kW for electric vehicles was built, and 96% efficiency from dc power source to battery load is achieved.