Extended Pulse-Powered Humidity-Freeze Cycling for Testing Module-Level Power Electronics

Research output: NRELPresentation


An EMI suppression capacitor (polypropylene film type) failed by 'popcorning' due to vapor outgassing in the pulse powered humidity-freeze cycles. No shorts or shunts could be detected despite mildly corroded metallization visible in the failed capacitor. Humidity-freeze cycling is optimized to break into moisture barriers. However, further studies will done on additional MLPE devices to optimize the stress testing for condensation to precipitate any weakness to short circuiting and other humidity/bias failure modes.
Original languageAmerican English
Number of pages12
StatePublished - 2017

Publication series

NamePresented at the 2017 Photovoltaic Reliability Workshop (PVRW), 28 February - 2 March 2017, Lakewood, Colorado

NREL Publication Number

  • NREL/PR-5J00-68846


  • EMI suppression
  • humidity freeze cycling
  • MLPE
  • popcorning
  • short circuit


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