PCB형 유도 가열 코일의 기생 커패시턴스와 임피던스 매칭 네트워크 설계의 영향

Conventional train systems employ a heating wire to melting snow and ice on railway turnouts. However, the efficiency of the heating wire is low and heating time is slow. Induction heating systems generate magnetic fields using a high frequency coil and induce eddy-current on a heating plate to warm up. The induction heating can concentrate energy on the heating plate. Therefore, the efficiency is high and the heating plate has rapid heating time. For purposes of downsizing and mass production, a PCB(Printed Circuit Board) coil can be manufactured for the induction heating system. However, short turn spacings between PCB patterns bring parasitic capacitance, which induces self-resonance with the coil. In this paper, the parasitic capacitance on the PCB coil of the induction heating system is investigated and an input impedance matching network(IMN) that blocks high-order harmonic currents is designed and experimentally evaluated.