Implementation of 10[W] level wireless power transfer system with 6.78 MHz Class-D inverter

This paper fabricated Class-D switching inverter critically effect to power efficiency of wireless power transfer system and presented equivalent circuit to magnetically coupled resonator. We analyzed Voltage and current of resonator´s each node and in order to verification, observed power transfer characteristics of cascading Class-D inverter, magnetically coupled resonator and 50Ω load. Through analysis of theoretically model, it can be used to apply to other wireless power transfer systems with magnetically coupled resonator.