New core loss measurement method for high frequency magnetic materials

Magnetic core loss is an emerging concern for integrated POL converters. As switching frequency increases, core loss is comparable to or even higher than winding loss. Accurate measurement of core loss is important for magnetic design and converter loss estimation. And exploring new high frequency magnetic materials need a reliable method to evaluate their losses. However, conventional method is limited to low frequency due to sensitivity to phase discrepancy. In this paper, a new method is proposed for high frequency (lMHz~50MHz) core loss measurement. The new method reduces the phase induced error from over 100% to <;5%. So with the proposed methods, the core loss can be accurately measured.