Design of Class-E<inf>M</inf> power amplifier taking into account auxiliary circuit

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This paper presents a novel design procedure for class-EM amplifier. To improve the whole power conversion efficiency, the ZVS class-E doubler is applied to the auxiliary circuit. The auxiliary circuit satisfies zero voltage switching, which makes the power conversion efficiency be improved. Moreover, we applied the numerical design procedure for the class-E amplifier to the design of the class-EM amplifier. As a result, it is possible to design both the main circuit and the auxiliary one as one circuit. In addition, the derived element values have high accuracy for achieving all the switching conditions simultaneously. By comparison with calculated results and experimental ones, we can show the validity and effectiveness of the proposed design procedure. The laboratory experiment shows the amplifier with proposed design procedure achieves the 94.0 % power conversion efficiency under the 13.4 W output power and 3.5 MHz operation.

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