文档介绍：International Journal of the Physical Sciences Vol. 6(7), pp. 1653-1664, 4 April, 2011
Available online at S
DOI:
ISSN 1992 - 1950 ©2011 Academic Journals
Full Length Research Paper
Deterioration analysis of aluminum electrolytic
capacitor for DC-DC converter
Lifeng Wu*, Yong Guan, Yinyu Du, Shihong Zhou and Wei Pan
Beijing Engineering Research Center of High Reliable Embedded System, Capital Normal University, Beijing 100048,
People’s Republic of China.
Accepted 25 January, 2011
Aluminum electrolytic capacitor is one of the ponents that restrict the life of DC-DC converter.
Studying its deterioration analysis has advanced to realizing the prognostics and health management
(PHM) technology of DC-DC converter. The main deterioration modes of aluminum electrolytic capacitor
include the capacitance decrease and the equivalent series resistance (ESR) increases. These cause the
ripple voltage to increase and eventually lead to the DC-DC converter failure. Some parameters of DC-DC
converter (such as the ripple voltage, the ripple current, etc.) are selected as the feature signals of the
aluminum electrolytic capacitor deterioration. By monitoring the changes of the feature signals, the
aluminum electrolytic capacitor deterioration degree can be measured indirectly. Through theoretical
analysis, this paper proposed a new idea to predict the remaining useful life (RUL) of DC-DC converter,
that is, establishing the curve of the ripple voltage as the aluminum electrolytic capacitor deterioration
and setting a warning point in the curve. When the change rate of the ripple voltage reached the warning
point, the life of the DC-DC converter e to an end. So, the RUL of the DC-DC converter can be
predicted. In this paper, the buck converter is verified by simulation and physical experiments amid good
agreements with the theory.
Key words: Aluminum electrolytic cap