Improved Current Shunt Characterization Method for Core Loss Measurement

Anfeng Huang, Xu Wang, Hanyu Zhang, Chulsoon Hwang, David Pommerenke, Jun Fan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


With the increasing switching frequencies and power densities in modern power converters, magnetic core losses are becoming more essential for efficiency and thermal optimization. Traditionally, the two-winding method suffers from sensitivity to phase error in practical measurements; this is mainly created by the unknown phase shift of a current-sensing resistor. Several methods have been developed to characterize the phase shift of a current shunt resistor; however, the load effects of oscilloscopes are ignored. As a result, the corresponding phase shift can be significantly underestimated. This article proposes an improved method for phase shift extraction of a current shunt to solve the problem. The effectiveness of the shunt characterization method is experimentally verified up to 50 MHz. Benefits from the proposed method, the time-consuming component tuning process is not required for core loss measurement. A measurement verification at 10 MHz shows its validity. Finally, a current shunt implemented with a coaxial resistor array is designed with a phase shift of 0.05° at 10 MHz and a parasitic inductance as low as 42 pH.

Original languageEnglish
Pages (from-to)8290-8300
Number of pages11
JournalIEEE Transactions on Power Electronics
Issue number7
Publication statusPublished - Jul 2022


  • Coaxial resistor
  • core loss
  • current-to-voltage impedance
  • two-port resistor
  • Core loss
  • Two-port resistor
  • Current-to-voltage impedance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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