Negative Impedance Characteristics in Passive Inductors

Hongbo Zhao, Shaokang Luan, Yang Yang, Rui Wang, Zhan Shen, Yicheng Liao, Wu Chen, Stig Munk-Nielsen

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


Inductors, known as basic passive components, are the essential devices in power electronics converters. The high frequency characteristics, including parasitic capacitance, in inductors can introduce significant capacitive current to the system due to the fast-switching transitions facilitated by wide-bandgap (WBG) devices. To represent these important parasitic capacitance behaviors, equivalent-circuit representations using capacitors have been proposed, where the capacitor values are usually assumed to be positive resulting in positive impedance characteristics. In this paper, the authors share an interesting finding of the negative impedance characteristics and equivalent negative capacitance in passive inductors, which are measured by an accurate impedance analyzer with factory-approved calibrations. Besides, two different measurement methods are also implemented to measure the negative impedance behaviors as cross validations for ensuring correct measured results. The experimental results also reveal that the negative impedance characteristics of inductors can be compensated by paralleling multiple ceramic capacitors. Perspectives, future work, and conclusions are addressed at the end of this paper.

Original languageEnglish
Title of host publication2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics, COMPEL 2022
Publication date2022
ISBN (Electronic)9781665410816
Publication statusPublished - 2022
Event23rd IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2022 - Tel-Aviv, Israel
Duration: 20 Jun 202223 Jun 2022


Conference23rd IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2022
SponsorHIL Academy, Payton Planar, Pazy Excelling in Science, SolarEdge, TDK, Typhoon HL
SeriesProceedings of the IEEE Workshop on Computers in Power Electronics, COMPEL

Bibliographical note

Publisher Copyright:
© 2022 IEEE.


  • capacitive
  • equivalent negative capacitance
  • Inductors
  • negative impedance
  • passive components


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