摘要
提出了一种适用于锂电池的电流监测电路,通过在锂电池供电环路引入灵敏电阻对电流进行采样,并使用时钟控制开关电容运算放大器和高速比较器,实现从模拟信号到数字信号的转换。在处理器中进行精确电流量的运算,能对过流、短路电流进行保护,也能用于精确计算电池阻抗、电量等相关参数。电路基于0.18μm CMOS工艺,电源电压为2.5 V。对所设计电路进行了仿真验证。结果表明,该电路在-40℃^+125℃应用环境温度范围内能够实现对电流的采样和编码功能,并且能对充放电动作进行判断。
A kind of current monitoring circuit which is applicable to lithium battery is proposed in this paper. The current is sampled by a sensitive resistor, which is introduced by the power supply loop, and achieves analog to digital conversion by using a clock control switched capacitor amplifier and a high-speed comparator. Accurate current operates in the processor, which can pro tect the circuit from operating on overcurrent or short circuit state, and also can be used to calculate the impedance, charge re maining and so on. This circuit is based on a standard 0.18 μm CMOS process, the power supply is 2.5 V. The simulation result shows that the current can be sampled and encoded when the circuit works between -40 ℃-125℃, it also can judge the battery is charging or not.
出处
《电子技术应用》
北大核心
2014年第5期31-34,共4页
Application of Electronic Technique
关键词
锂电池
电流监测
开关电容放大器
lithium battery
current monitoring
switched capacitor amplifier
