Wireless Power Transfer Using Class E Inverter With Saturable DC-Feed Inductor

Date published

2014-07-31T00:00:00Z

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IEEE Institute of Electrical and Electronics

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Article

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0093-9994

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Samer Aldhaher, Patrick Chi-Kwong Luk, Akram Bati, and James F. Whidborne, Wireless Power Transfer Using Class E Inverter With Saturable DC-Feed Inductor, IEEE Transactions on Industry Applications, Volume 50, Number 4, 2014, Pages 2710-2718.

Abstract

Resonant converters used as coil drivers in inductive links generally operate efficiently at optimum switching conditions for constant load values and ranges. Changes in load and range can shift the operation of the coil driver to a non-optimum switching state which results in higher switching losses and reduced output power levels. This paper presents a method to adapt to variations in range for a Class E inverter used as a coil driver in a wireless power transfer (WPT) system based on inductive coupling. It is shown that by controlling the duty cycle of the inverter’s switch and the value of its DC-feed inductance, the Class E inverter can be tuned to operate at optimum switching conditions as the distance between the coils of the WPT system changes. Mathematical analysis is presented based on a linear piecewise state-space representation of the inverter and the inductive link. Extensive experimental results are presented to verify the performed analysis and validity of the proposed tuning procedure.

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"(c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works."

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