Failure Mechanism of Film Resistors under Fully-Immersed Liquid-Vapor Phase Change Cooling Technology

被引：0
|
作者：
Wen Y. [1 ]
Ruan L. [1 ,2 ]
机构：
[1] Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing
[2] University of Chinese Academy of Sciences, Beijing
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2019年 / 34卷 / 24期
关键词：
Failure mechanism; Film resistor; Liquid-vapor phase change; Reliability;
D O I：
10.19595/j.cnki.1000-6753.tces.181635
中图分类号：
学科分类号：
摘要：
With the development of power electronics, switching mode power supplies (SMPSs) have already been widely used in fields of communication, energy and aerospace. High power density and high reliability are the development directions of SMPSs. Failures caused by overheating and the reliability reduction have become a bottleneck of the power density of SMPSs. The fully-immersed liquid-vapor phase change cooling technology is a new way to achieve efficient heat dissipation of SMPSs due to its high cooling efficiency and high reliability. For the fully-immersed liquid-vapor phase change cooling switching mode power supply, the cooling medium is in direct contact with the power supply device, causing the resistance of the film resistors connected to high voltage to rise or even break, which affects the stable operation of the SMPS. In this paper, through macro signal monitoring and microscopic material analysis, the external influence factors for the failures and the internal failure mechanisms of film resistors working in the cooling medium are studied, and the structure characteristics of the film resistors that can work stably in the cooling medium is also analyzed. The results can provide component selection and design guidance for the fully-immersed liquid-vapor phase change cooling switching mode power supply. It is of theoretical significance and application value for improving the reliability of fully-immersed liquid-vapor phase change cooling switching mode power supplies and completing the theoretical system of liquid-vapor phase change cooling technology applied to electrical electronic equipment. © 2019, Electrical Technology Press Co. Ltd. All right reserved.
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页码：5144 / 5150
页数：6
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