A novel online ESR and C identification method for output capacitor of buck converter

As electrolytic capacitor is apt to fail in power circuits, it is very important to monitor its electrical parameters, mainly the equivalent series resistance (ESR) and capacitance (C). A novel non-invasive online monitoring method of capacitor's ESR and C for CCM buck converter is proposed in...

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Bibliographic Details
Published in2014 IEEE Energy Conversion Congress and Exposition (ECCE) pp. 3476 - 3482
Main Authors Yao Kai, Hu Wenbin, Tang Weijie, Lyu Jianguo, Cao Jingcheng
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2014
Subjects
Capacitors
Inductors
Monitoring
Pulse width modulation
Switches
Temperature measurement
Trigger circuits
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Summary:As electrolytic capacitor is apt to fail in power circuits, it is very important to monitor its electrical parameters, mainly the equivalent series resistance (ESR) and capacitance (C). A novel non-invasive online monitoring method of capacitor's ESR and C for CCM buck converter is proposed in this paper. Based on the ac component of capacitor voltage, the calculation model is founded. By sampling the PWM 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 monitoring system is presented. The experimental results validate the effectiveness of the method.
ISSN:2329-3721
2329-3748
DOI:10.1109/ECCE.2014.6953873