"Improved Current Shunt Characterization Method for Core Loss Measureme" by Anfeng Huang, Xu Wang et al.
 

Abstract

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.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

Coaxial resistor; Core loss; Current-to-voltage impedance; Two-port resistor

International Standard Serial Number (ISSN)

1941-0107; 0885-8993

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2023 Institute of Electrical and Electronics Engineers, All rights reserved.

Publication Date

01 Jul 2022

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