Design procedure of a class E2 DC-DC converter for megahertz wireless power transfer based on a compact class E current-driven rectifier

This paper presents a design procedure of a Class E2 DC-DC converter for megahertz wireless power transfer. The design formulas are analytically derived based on the input impedance of the Class E rectifier. A 6.78 MHz Class E2 DC-DC converter is designed and implemented by means of those formulas. The power-level of the converter is 15W. The experiments are provided to verify the proposed design procedure and evaluate the performance of the converter. The experiment results show that the Class E2 converter for loosely coupled wireless power transfer can achieve a very high efficiency, 85% for the best case, over a wide load and varying mutual inductance. Finally, the well agreement between the experimental results and design specifications indicates the validity of the proposed design procedure.

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