Reliability Evaluation of Air Dryer Control Printed Circuit Board for Electric Multiple Unit by Accelerated Life Test

Compressed air is used for brake system of electric multiple units, and air dryers are installed to prevent condensed water from being contained in the braking system. The printed circuit board (PCB) for the air dryer is located under the floor, so it is necessary to secure reliability due to high t...

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Bibliographic Details
Published inJournal of electrical engineering & technology Vol. 19; no. 1; pp. 821 - 830
Main Authors Kang, Gil Hyun, Kim, Kyung Sik, Chang, Chin Young, Kim, Chul Su
Format Journal Article
LanguageEnglish
Published Singapore Springer Nature Singapore 2024
대한전기학회
Subjects
Electrical Engineering
Electrical Machines and Networks
Electronics and Microelectronics
Engineering
Instrumentation
Original Article
Power Electronics
전기공학
Accelerated life test
Reliability analysis
Constant stress
Air dryer PCB
Temperature-humidity model
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Summary:Compressed air is used for brake system of electric multiple units, and air dryers are installed to prevent condensed water from being contained in the braking system. The printed circuit board (PCB) for the air dryer is located under the floor, so it is necessary to secure reliability due to high temperature and humidity in the use environment. This study aims to evaluate reliability and to reduce test time of accelerated life test by using 4 year degraded samples. Instead of conventional expensive thermal cycling test. Another target is to confirm the performance of already developed accelerated life tester for various PCBs of railway vehicles. Using this tester, accelerated life test of air dryer PCB with two constant stresses were performed under conditions of operating temperature of 341 K, high temperature of 343 K and 358 K, and high humidity of 85% and 95%. From the results of the tests, it was found that the 2 parameter Weibull distribution with the maximum likelihood function value using temperature-humidity model was suitable. The average life expectancy of the PCB was 22 years at a temperature of 341 K and a humidity of 52%, and the B5 life was 18 years, which are acceptable level for heavy maintenance. In addition, it was found that the proposed use of degraded PCB can significantly reduce test time.
ISSN:1975-0102
2093-7423
DOI:10.1007/s42835-023-01447-6