摘要
随着电力电子技术的发展,开关电源作为供电装置广泛应用于通信、能源、航空航天等领域,高功率密度、高可靠性是其发展方向。因过热问题引发故障继而导致可靠性降低成为开关电源功率密度提升的瓶颈。全浸式液汽相变冷却技术冷却效率高、安全可靠,是实现开关电源高效散热的新途径。对于全浸式液汽相变冷却开关电源,相变冷却的工作介质与电源器件直接接触,电源中与高电压相连的贴片电阻发生了阻值上升甚至断路现象,影响开关电源的稳定运行。该文通过宏观信号监测和微观材料分析手段,得到了工作介质环境下贴片电阻失效的外部影响因素及内在机理,明确了可在工作介质环境下稳定工作的贴片电阻结构特征。研究成果可为全浸式液汽相变冷却开关电源提供器件选型及设计指导,对提高全浸式液汽相变冷却开关电源运行可靠性,完善液汽相变冷却技术应用于电力电子装备的理论体系具有重要的理论意义及应用价值。
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.
作者
温英科
阮琳
Wen Yingke;Ruan Lin(Institute of Electrical Engineering Chinese Academy of Sciences,Beijing 100190 China;University of Chinese Academy of Sciences,Beijing 100049 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第24期5144-5150,共7页
Transactions of China Electrotechnical Society
基金
中国科学院前沿科学重点研究计划(QYZDY-SSW-JSC026)
国家自然科学基金(5177071143)资助项目。
关键词
液汽相变
贴片电阻
失效机理
可靠性
Liquid-vapor phase change
film resistor
failure mechanism
reliability
