Contactless feed-back control method through power stage transformer in non-contact battery charger

무접점 충전기의 전력단 변압기를 통한 무접점 피드백 제어방식

A non-contact battery charger which transfers energy using magnetic field has a difficulty with a feed-back control due to the interaction between the power and signal processing This paper proposes an effective method which uses auxiliary windings of transformer as signal path and copes with cross-talk using the MOSFET ringing phenomenon and ceramic filter. The power stage is half-bridge series resonant converter. Design procedure and experimental verification are presented.