成组超级电容器的电压/流在线检测方法

A method to measure voltage and current of supercapacitors in groups online

超级电容器作为一种新兴能量存储器件,在电力、能源等领域得到广泛使用。但超级电容单体电压很低,需要串并联使用,以获得较高的输出电压和功率。使用时需实时监测单体电压,防止过充过放。文章设计了一种母线式电压在线检测系统,通过译码器电路控制光耦隔离继电器,将测量单体切换到测量母线上,使用一套运算放大电路处理,快速得到AD模数转换的结果,测量结果一致性较高。系统通过实验验证,电路简单易行,性能稳定,满足测量精度要求,有一定的实践参考意义。

As a new energy storage device,supercapacitors are widely used in the fields of power,energy etc.However,the supercapacitors need to be used in parallel or in series to obtain higher output voltage and power due to the lower voltage of single supercapacitors.The voltage of the single supercapacitors needs to be under real-time monitoring to avoid overcharge or overdischarge.In this study,a bus-type online voltage detection system is designed.Each measured supercapacitor is switched to the measurement bus,which is controlled by the optocoupler isolation relays through the decoding circuit.A set of amplifier circuit is used to process the voltage signal,and the AD conversion results can be obtained quickly.The results are of high consistency.The system is testified by the experiment.The circuit is simple and easy to operate,the performance is stable,and the measurement accuracy is satisfied,which has some practical significance.