more than 75% transfer efficiency at an operating distance between the transmit and receive coils of less than 10 cm.

In 1993, Professor John Boys and Professor Grant Covic, of the University of Auckland in New Zealand, developed systems to transfer large amounts of energy across small air gaps. It was putting into practical use as the moving crane and the AGV non-contact power supply in Japan. In 1998, RFID tags were patented that were powered in this way.

In November 2006,

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