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The Korean Institute of Electrical Engineers (대한전기학회)
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Techniques to Diagnose Short-Circuit Faults in the Switching Mode Power Supply for Display

디스플레이용 스위칭모드 전원장치의 단락 고장분석 검출기법

  • Lee, Jae-Won (Dept. of Electrical Engineering, University of Ulsan) ;
  • Chun, Tae-Won (Dept. of Electrical Engineering, University of Ulsan)
  • Received : 2016.01.09
  • Accepted : 2016.06.15
  • Published : 2016.07.01
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Abstract

This paper proposes techniques to diagnose short-circuit faults of both the diodes and power FET in switching mode power supply (SMPS) by using a simple analog tester. The diodes in full-bridge rectifier, power FET, switching transformer, and some sensors are modelled with resistor. The total resistance value measured at the input terminal of a SMPS is analyzed when the short-circuit faults of diodes in a full bridge rectifier or power FET are occurred. The short-circuit faults of one or two diodes in a full bridge rectifier, power FET, and both the diodes in a full bridge rectifier and power FET can be detected by a range of total resistance, which is measured by the analog tester. Through experiments, the theoretical analysis for total resistance under short-circuit faults can be verified.

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References

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