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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Power module stray inductance extraction: Theoretical and experimental analysis

  • Jung, Dong Yun (DMC Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Jang, Hyun Gyu (DMC Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Cho, Doohyung (DMC Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Kwon, Sungkyu (DMC Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Won, Jong Il (ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Lee, Seong Hyun (ICT Creative Research Laboratory, Electronics and Telecommunications Research Institute) ;
  • Park, Kun Sik (DMC Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Lim, Jong-Won (DMC Convergence Research Department, Electronics and Telecommunications Research Institute) ;
  • Bae, Joung Hwan (QIT Co., Ltd.) ;
  • Choi, Yun Hwa (JMJ Korea)
  • Received : 2020.11.09
  • Accepted : 2021.04.22
  • Published : 2021.10.01
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Abstract

We propose a stray inductance extraction method on power modules of the few-kilovolts/several-hundred-amperes class using only low voltages and low currents. The method incorporates a double-pulse generator, a level shifter, a switching device, and a load inductor. The conventional approach generally requires a high voltage of more than half the power module's rated voltage and a high current of around half the rated current. In contrast, the proposed method requires a low voltage and low current environment regardless of the power module's rated voltage because the module is measured in a turn-off state. Both theoretical and experimental results are provided. A physical circuit board was fabricated, and the method was applied to three commercial power modules with EconoDUAL3 cases. The obtained stray inductance values differed from the manufacturer-provided values by less than 1.65 nH, thus demonstrating the method's accuracy. The greatest advantage of the proposed approach is that high voltages or high currents are not required.

Keywords

Acknowledgement

The authors would like to thank Mr Kim from KAPSEUNG Power System for helping fabrication and measurement of the test board.

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