A Sparsity-Promoting Time Domain Evaluation Method for Thermal Transient Measurement of Power Semiconductors

Yi Zhang, Anton Evgrafov, Shuai Zhao, Sven Kalker, Rik W. de Doncker

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review


This article investigates evaluation methods of thermal transient measurements to obtain the internal thermal structure of semiconductor devices. First, the study uncovers the limitations of a widely accepted standard method that uses frequency-domain deconvolution. An important finding is that the sideband of the time constant spectrum by the standard method has no physical meaning despite it beeing interpreted as a continuous spectrum for a long time. Second, by understanding the limitations of the existing method, the article proposes an alternative method that remodels the frequency-domain deconvolution as a regularized least squares problem in the time domain. With the benchmark of the true values of several thermal networks based on simulation, the proposed sparsity-promoting method demonstrates several advantages, including a better ability to identify adjacent parameters in the time-constant spectrum and the obtained structure function reducing relative error by an order of magnitude. The influence of varying noise levels has also been evaluated. Finally, a proof-of-concept experiment using a commercial power semiconductor device validates its effectiveness.

TidsskriftIEEE Transactions on Power Electronics
Udgave nummer6
Sider (fra-til)7525-7535
Antal sider11
StatusAccepteret/In press - 2024


  • Amplitude modulation
  • Deconvolution
  • Frequency-domain analysis
  • Semiconductor device measurement
  • Standards
  • Time-domain analysis
  • Transient analysis


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