一种改进的串联电池组单体电池电压测量方法

摘要

针对基于运算放大器和MOSFET管的串联电池组单体电池电压测量方法存在漏电流的问题,提出了一种改进的电压测量方法.在每节电池的两端增加了一个电压跟随器,可有效降低漏电流；增加了光电继电器作为运算放大器的电源开关,使电压测量电路在断电状态下不消耗电流；增加了一个稳压二极管,以防止MOSFET管被击穿.测试结果验证了改进方法的有效性.%In view of problem of leakage current in voltage measuring method for single battery in series batteries based on operational amplifier and MOSFET,an improved voltage measuring method was proposed.Voltage follower is added at two ends of each battery to reduce leakage current effectively;photoelectric relay is added as power switch of operational amplifier to make voltage measuring circuit not consume current under status of power off; zener diode is added to prevent breakdown of MOSFET.The test result validates effectiveness of the improved method.