A novel method of measurement of loss in a track of a turn of a planar transformer for induction heating applications

摘要

The new trend in power converters is to design planar magnetic components aimed at low profile. However, at high frequencies, the AC losses induced in the planar inductor and transformer windings become significant due to skin and proximity effects. This paper presents the design of a high-frequency planar transformer (HFPT) for an induction heating system. The aim of this design is to adapt the levels of voltage and current from the inverter to the resonant tank characteristics. We propose a planar structure of Litz in the primary of our HFPT to reduce the AC resistance of the planar conductor. The Litz structure is obtained with a technique of the turn's division in four tracks and their intersection so that the current passes all over the turn.