电解电容器
电容器
可靠性(半导体)
降级(电信)
可靠性工程
尺寸
薄膜电容器
电压
汽车工程
计算机科学
工程类
电气工程
功率(物理)
物理
热力学
视觉艺术
艺术
作者
Hao Niu,S. Wang,X. Ye,H. Wang,Frede Blaabjerg
标识
DOI:10.1016/j.microrel.2018.06.027
摘要
The electrolytic capacitor (Al-Cap) is widely considered as one of the reliability-critical components in LED driver applications. A realistic lifetime prediction of Al-Caps would be beneficial to the sizing of capacitors to fulfill a specified design lifetime. This paper investigates the impact of electrolytic capacitor parameter shifts on the LED driver performance and the capacitor reliability. The operation condition, degradation, and tolerance are considered as the main reasons that deviate the parameters from nominal values. A method to model the degradation of Al-Cap parameter is introduced as well. In the case study of a flyback LED driver for street lighting, the contribution of parameter shifts to the electrical performance of LED drivers and Al-Cap core temperature is evaluated based on both theoretical analysis and simulation. A quantitative comparison of the estimated lifetime of Al-Cap in the LED driver is given with and without the consideration of capacitor parameter shifts within the service life. The proposed method enables a more realistic way for electrolytic capacitor lifetime prediction in LED drivers, which would otherwise have the risk of overestimation.
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