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 nonoptimum 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 resonant inductive coupling. It is shown that by controlling the duty cycle of the inverter's switch and the value of the DC-feed inductance, the Class E inverter can be tuned to operate at optimum switching conditions as the distance between the resonant coils of the WPT system changes. Mathematical analysis is presented based on a linear piecewise state-space representation of the inverter and the resonant inductive link. Extensive experimental results are presented to verify the performed analysis and validity of the proposed tuning procedure.
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