基于锁相放大的超级电容内阻检测装置研究

Research on Supercapacitor Internal Resistance Measure Equipment Based on Phase-locked Amplification

超级电容模块组在使用时存在电压均衡问题,为保证其在使用的过程中的可靠性,安全性、延长超级电容的使用寿命,需对超级电容内阻进行检测。首先阐述了锁相放大的超级电容内阻测量原理,在此基础上设计了一种基于锁相放大的超级电容内阻测量电路,包括交流信号源电路、信号调理电路、锁相放大电路、低通滤波电路等。实验结果表明,超级电容内阻检测系统能有效地检测超级电容的内阻,其检测结果的重复性误差小于3%,达到了超级电容内阻检测的要求。

There was a voltage equalization problem when the super capacitor module group is used. In order to raise reliability,and extend the life,it is necessary to detect the internal resistance of super capacitor. The principle of internal capacitance measurement of phase - amplified supercapacitor was described. The supercapacitor internal resistance measurement circuit based on phase - locked amplification was designed,including AC signal source circuit,signal conditioning circuit,phase - locked amplifier circuit,and low Pass filter circuit,etc. The results show that the repeatability error of the internal resistance measurement is less than 3%,meet the requirements of the supercapacitor internal resistance detection.