A Parameter Design Methodology Based on Voltage/Current Stress Optimization for LCCL-LC Compensated MCR WPT Systems

In medium-to-high power magnetically coupling resonant wireless power transfer (MCR WPT) systems, either voltage stress or current stress on resonant components tends to be an important issue, depending on the input and output specifications. High current stress will increase the conduction loss on coils and reduce the efficiency, while high voltage stress will bring the difficulty to the design of resonant components and also will deteriorate the system reliability. In this paper, a parameter design methodology based on voltage/current stress optimization is proposed for LCCL-LC compensated MCR WPT systems. By designing the resonant frequency and the self-inductance of two coils properly, the voltage/current stress of the components are effectively controlled. A 1kW LCCL-LC compensated MCR WPT system is built, the trade-off of voltage/current stress among all the resonant components was obtained, and the high efficiency up to 92.2% is also achieved.