Loss Evaluation of Magnetic Devices Using Cauer Equivalent Circuit Identified From Input Impedance

This study proposes a method for analyzing magnetic devices such as inductors and wireless power transfer (WPT) systems based on a Cauer equivalent circuit. The circuit parameters are determined based on computed or measured input impedance. It is possible to obtain a dynamic response and eddy-current loss in the time domain for arbitrary drive voltage waveforms from the synthesized Cauer equivalent circuit. Magnetic saturation in the core of an inductor could be accurately represented using the Cauer circuit. Moreover, the transient response of a WPT device is shown to be modeled by the Cauer circuit, including the effect of misalignment.