Parallel Resonant Loss Characterization of High Frequency Magnetic Components

We propose a method to characterize losses in inductors and transformers especially suited for high operating frequencies (≥ 500 kHz). The proposed technique uses parallel resonance to directly measure the loss, i.e., the real component of a structure’s complex impedance. The scheme uniquely allows for testing low-impedance DUTs at high drive currents, enabling more complete characterization of magnetic materials and components. We describe the method, analyze error mechanisms, and experimentally validate the method against alternative resonant techniques.