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

Author

Yao Kai ; Hu Wenbin ; Tang Weijie ; Lyu Jianguo ; Cao Jingcheng

Author_Institution

Sch. of Autom., Nanjing Univ. of Sci. & Technol., Nanjing, China

fYear

2014

fDate

14-18 Sept. 2014

Firstpage

3476

Lastpage

3482

Abstract

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.

Keywords

electrolytic capacitors; monitoring; power capacitors; power convertors; switched mode power supplies; C identification method; CCM buck converter; PWM signal; electrical parameters; electrolytic capacitor; equivalent series resistance; noninvasive online monitoring method; online ESR; output capacitor; output voltage; Capacitors; Inductors; Monitoring; Pulse width modulation; Switches; Temperature measurement; Trigger circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2014 IEEE

Conference_Location

Pittsburgh, PA

Type

conf

DOI

10.1109/ECCE.2014.6953873

Filename

6953873