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http://dx.doi.org/10.5370/KIEE.2016.65.7.1186

Techniques to Diagnose Short-Circuit Faults in the Switching Mode Power Supply for Display  

Lee, Jae-Won (Dept. of Electrical Engineering, University of Ulsan)
Chun, Tae-Won (Dept. of Electrical Engineering, University of Ulsan)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.65, no.7, 2016 , pp. 1186-1192 More about this Journal
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.
Keywords
Analog tester; Short-circuit fault; Switching Mode Power Supply (SMPS);
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