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Gate drive circuits for modern power electronic switches such as MOSFET and IGBT often require electrical isolation. This paper describes initial results of some coreless PCB-based transformers that can be used for MOSFET and IGBT devices at high frequency (500 kHz to 2 MHz) operation. Such transformers substantially reduce the labour cost in winding core-based transformers and simplifies the automation process of gate drive circuits.
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Hui et al. (2002) studied this question.