Performance of Class-E inverters under non-resistive loads

Jeyamanoharan, Dominic (2022) Performance of Class-E inverters under non-resistive loads. Masters thesis, Memorial University of Newfoundland.

[English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (2MB)

Abstract

Class-E inverters are popularly used in high frequency wireless power transmission because of their compact design and high efficiency. The inverter consists of resonant elements and a transistor, typically a wide band gap device that is toggled to provide an alternating current signal to the load. Although being a highly efficient and flexible converter, most analysis for this inverter assumes resistive loading. In the presence of non-resistive loading, the performance of the inverter can be negatively impacted. This work investigates the performance of the load-independent Class-E and Class-E push-pull inverters under non-resistive loads. Several solutions are proposed to mitigate or prevent the associated performance degradations. Although the proposed solutions are flexible at working with any applications, the target application for this work is a capacitive coupled wireless power transfer system. It is shown that a suitable matching network or reactive power compensation can maintain highly efficient Class-E inverter performance even under non-ideal loading conditions.

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