Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Study on the Causes of Malfunctions of PCBs Applied to the Power Saving Mode of Electrical Systems and its Solution

전기시스템의 절전모드에 적용되는 PCB의 오작동 원인 개선에 관한 연구

  • Park, Hyung-Ki (Department of Fire Safety Engineering, Jeonju University) ;
  • Choi, Chung-Seog (Department of Fire Safety Engineering, Jeonju University)
  • 박형기 (전주대학교 소방안전공학과) ;
  • 최충석 (전주대학교 소방안전공학과)
  • Received : 2012.12.03
  • Accepted : 2013.04.02
  • Published : 2013.06.30
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Abstract

The purpose of this study is to find the causes of malfunctions and defective operation of printed circuit boards(PCBs) built into home refrigerators to perform power saving functions. This study performed an electrostatic test of a PCB built-in using an Auto Triggering system; lightning and impulse tests using an LSS-15AX; and an impulse test using an INS-400AX. From the analysis of a secondarily developed product, it was found that electrostatic discharge(ESD) caused more malfunctions and defective operations than electric overstress(EOS) due to overvoltage. As a result of increasing the condenser capacity of the PCB circuit, withstanding voltage was increased to 7.4 kV. In addition, this study changed the power saving mode and connected a varistor to the #2 pin of an IC chip. As a result, the system consisting of all specimens of a finally developed product was operated stably with an applied voltage of less than 10 kV. This study found it necessary to perform quality control at the manufacturing stage in order to reduce the occurrence of electrostatic accidents to IC chips built into a PCB.

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References

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