This paper introduces an extended Cauer-equivalent circuit model of magnetic components that can represent both eddy-current effects and capacitive properties. As this model considers the skin and proximity effects of the winding as well as the parasitic capacitance, it is accurate from DC to more than 500 MHz, even with multiple resonances. The resonant characteristics are expressed by RLC series circuits in parallel with a Cauer circuit representing the inductive part. The proposed circuit is applied to two test inductors, and then the effectiveness of this method is verified.
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