Reactive power comparison of four-coil, LCC and CLC compensation network for wireless power transfer

Compensation circuit is very important in a wireless power transfer (WPT) system. At resonant frequency, the four-coil structure can be equivalent to two different two-coil structures with LCC and CLC compensation. The voltage and current in power electronics converter and coils are the same for the three structures. However, the voltage and current in the compensation circuits are different. In this paper, the optimal parameter design methods for four-coil, LCC and CLC structure are proposed. Then, the reactive power of the three optimized system using different compensation circuits is compared by analysis, simulation and experiment. A simple conclusion comes out that the LCC compensation circuit has the minimum reactive power among the three structures.