Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2759

Full Length Research Paper

A new deterioration model for electrolytic capacitors in direct current to direct current (DC-DC) converters

Yinyu Du, Yong Guan*, Lifeng Wu, Wei Pan, Guohui Wang and Shihong Zhou
Beijing Engineering Research Center of High Reliable Embedded System, Capital Normal University, Beijing, China 100048.
Email: [email protected]

  •  Accepted: 21 August 2011
  •  Published: 23 January 2012


The output filter aluminum electrolytic capacitor is one of the key components that determine the life of direct current to direct current (DC-DC) converters, and so, establishing a deterioration model for the electrolytic capacitor is the basis for analyzing the impact on the converters’ performances. Generally, the main parasitic parameters that indicate the electrolytic capacitor deterioration such as capacitance (C) and equivalent series resistance (ESR) are separately considered when building the model. However, taking the Buck-Boost converter as the research object, this paper discussed the impact of the two kinds of parasitic parameters simultaneous degradation on the DC-DC converters. Firstly, according to the electrolytic capacitor failure mechanisms, a joint degradation model for the C and ESR-a new deterioration model for the electrolytic capacitor was established. On the basis, this paper discussed the impact on the system pole-zero of the parasitic parameters degradation, analyzed the electrolytic capacitor deterioration on how to affect the performances of the DC-DC converter, and verified the theoretical analysis results through the software simulation experiments. The new model provides the theoretical basis for monitoring the health state of DC-DC converters.


Key words: Electrolytic capacitor, deterioration, capacitance, equivalent series resistance (ESR), joint degradation model, pole-zero.


 DC-DC, Direct current to direct current; C, capacitance; ESR, equivalent series resistance; PHM, prognostic health management; RHP, right-half plane.