수신부 균등 무선전력전송을 위한 동기정류기용 제어기 설계

초록

To uniformly transfer wireless power delivery toward multiple Rx circuits under a magnetic dead-zone, an analog controller-based high efficiency synchronous rectifier is proposed in this paper. To compensate for the reactance of long-line Tx coils for dynamic wireless power transfer (WPT) systems of railway vehicles, segmented resonant capacitors are inevitably used in each Tx coil line. In this case, magnetic dead-zones exist on the segmented resonant capacitors, and they cause unbalanced wireless power delivery among multiple Rx circuits. Thus, load power of the multiple synchronous rectifiers, which are connected in parallel, should be appropriately controlled for uniformly wireless powering of Rx circuits. Using the proposed controller including phasor detection circuit, integrator, comparators, and reference generators, optimal duty cycle can be provided to the synchronous rectifiers for uniform wireless power delivery. As a result, uniform wireless powering of the two rectifiers has been achieved for 500 kW load power by the proposed rectifier, which has 97.0% power efficiency, although one of the Rx circuits is under a magnetic dead-zone.

키워드