Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 30, Issue 12, Pages 6993-7005Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2014.2383436
Keywords
Buck converter; electrolytic capacitor; ESR and C; online identification
Categories
Funding
- National Natural Science Foundation of China [51307085]
- Natural Science Foundation of Jiangsu Province [BK2012400]
- China Postdoctoral Science Foundation [2012M521087]
- Postdoctoral Science Foundation of Jiangsu Province [1202068C]
- Science and Technology Support Program of Jiangsu Province [BE2013125]
- Jiangsu Province Joint Innovation Fund of Industry, Education, and Research-Prospective Joint Research Project [BY2013004-03, BY2013004-01, BY2013004-04]
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As electrolytic capacitor is apt to fail in power circuits, it is very important to identify its electrical parameters, mainly the equivalent series resistance (ESR) and capacitance (C). A noninvasive online identification method of capacitor's ESR and C for continuous-conduction-mode (CCM) buck converter is proposed in this paper. Based on the ac component of capacitor voltage, the calculation model is founded. By sampling the pulse width modulation signal and output voltage, the method needs no current sensor and is effective for the CCM buck converter operating at different conditions. Implementation of the identification system is presented. The tests are carried out for different aged capacitors and ambient temperatures. The experimental results validate the effectiveness of the method.
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