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This paper presents the design and implementation of an LED lighting module powered by a wireless power transfer system. The overall system achieves an efficiency of 82% with an output power of 36 W when the load resistance in the receiver is 30 Ω, which is the turn-on resistance of the LED lighting module. The transmitter of the system adopts ClassE power amplifier structure instead of Class-D, to decrease the number of transistors and its cost. The coils of the system are designed by electromagnetic coupling methodology and realized by Litz wire to reach high efficiency. Matching circuits between the system blocks are also discussed in this paper in order to obtain the excellent system performance.

A 36 W Wireless Power Transfer System with 82% Efficiency for LED Lighting Applications