An Impedance Converter-Based Probe Characterization Method for Magnetic Materials Loss Measurement


As an essential component in power applications, magnetic cores and their design play an important role in achieving high efficiency and high power density. Accurate measurement of the core loss is important for inductor and power converter optimization. Loss measurement depends on exactly determining the phase angle between the voltage and the current. However, measurement errors can be introduced due to the discrepancies in propagation delays in the voltage and current sensors. In addition, the propagation delay is frequency dependent, but has a large influence in the MHz range and above. Previously, several methods have been proposed to compensate for this discrepancy but they are time consuming and can result in large measurement errors. In this paper, a characterization method for core loss based on a vector network analyzer and an impedance converter is proposed to accurately measure the phase discrepancies between voltage and current sensors. The proposed method is experimentally verified up to 15 MHz with a three-coil test setup.


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Publication Status

Early Access

Keywords and Phrases

Core Loss; Core Loss Characterization; Current Measurement; Impedance; Impedance Converter; Loss Measurement; Phase Discrepancy; Probes; Propagation Delay; VNA; Voltage Measurement

International Standard Serial Number (ISSN)

2168-6785; 2168-6777

Document Type

Article - Journal

Document Version


File Type





© 2021 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

14 Oct 2021