Development of a multi-megahertz frequency converter for wireless power applications

Seary, Christopher Thomas (2020) Development of a multi-megahertz frequency converter for wireless power applications. Masters thesis, Memorial University of Newfoundland.

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Abstract

A novel wave-shifting, frequency-reducing converter topology is developed, with the target application of capacitive wireless power transmission. The new topology combines a Class-E synchronous rectifier and Class-D inverter. Zero-voltage switching is achieved, and the converter is load-independent. The developed converter is an AC-AC converter, which can divide the input frequency by any even whole number. The power throughput of the rectifier is less than that of the total converter, especially when the ratio of input to output frequency is small. Therefore, the wave-shifting converter has a potential advantage in efficiency over AC-DC-AC frequency reducers. The feasibility of the converter is demonstrated by simulation and experimental results. The intended application of the developed converter is to drive an isolation transformer in a capacitive wireless power rectifier. High-frequency transformers have been investigated, and it is shown that a suitable transformer is compatible with the developed converter.

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