Abstract
In the design stage of a WPT system, many aspects including maximum achievable efficiency, misalignment tolerance, stray magnetic fields, etc., should be considered. However, after a WPT system is designed and fabricated, its maximum achievable efficiency is determined. Yet the system might not be able to operate at this maximum efficiency because the actual efficiency of a WPT system is highly dependent on the mutual coupling and the equivalent load resistance which are varying. To ensure a WPT system to operate at the maximum achievable efficiency regardless of the mutual coupling and the load resistance, the actual load resistance should be matched to the optimal load resistance of the system in real time. This chapter reviews some technical approaches for achieving maximum or near-maximum efficiency operations in WPT systems.
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