A Novel Dual-LCC Hybrid Compensation Network for High-Efficiency CC-CV Wireless Charging of an EV Battery considering Weak Communication

In this work, a novel dual-LCC hybrid compensation network is proposed which can offer high efficiency in both the Constant Current (CC) and Constant Voltage (CV) charging modes of an Electric Vehicle (EV) battery at a fixed operating frequency. Here, the compensation network is reconfigured as soon as the mode changes from CC to CV using two ac-switches. The proposed technique works well with weak communication, i.e., it doesn't require continuous high-speed real-Time feedback signals from the receiver end for current or voltage regulation. Hence, the issue of interference caused by the higher order switching harmonics of the power converter with the wireless communication link is avoided, thus increasing the reliability and minimizing the cost of the wireless communication module. Moreover, this technique can also maintain a load-independent primary-coil current in both the charging modes and puts no constraints on the design of the transmitter and receiver coils, which makes it more practical. The proposed work is well-suited for the static and semi-dynamic wireless EV battery charging application, where the coupling condition can be assumed to be constant and a high efficiency CC-CV battery charging modes are desirable. The claims are verified through simulation of a 3.2 kW charger designed based on Standard SAE J2954.