Title :
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
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;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6953873
