Analytical design for resonant inductively coupled wireless power transfer with class-E^2 DC-DC converter <Abstract> This paper presents a resonant inductive coupling wireless power transfer (RIC-WPT) system with a class-E^2 dc-dc converter along with its analytical design procedure. By using the class-E inverter as a transmitter and the class-E rectifier as a receiver, the designed WPT system can achieve a high power-conversion efficiency because of the class-E ZVS/ZDS conditions satisfied in both the inverter and the rectifier. By carrying out the PSpice simulation of the design example, the validity of the design procedure is shown. In the simulation results, the system achieved 65.9 % overall efficiency at 5 W output power, coil distance 30 cm, and 5 MHz operating frequency. Additionally, the overall efficiency of the system is derived from the analytical expressions. We show that the analytical expression of the efficiency of the DC-DC system is equal to that of the AC-AC system. |