基于锂电池均衡保护芯片的电压采样电路设计

Design of a Voltage Sampling Circuit Based on Lithium Battery Equalization Protection Chip

针对锂电池均衡保护问题,设计一种基于锂电池均衡保护芯片的电压采样电路。采用主动均衡的方式对锂电池进行均衡保护。电压采样电路采样两节锂电池电压以监测锂电池的差异性,并通过8位逐次逼近型数模转换器进行数据转换。运用均衡控制逻辑分析转换的数据,对锂电池执行均衡保护。采用华虹NEC 0.18μm BCD工艺进行设计并通过仿真验证。仿真结果表明,电压采样电路有较高的电压采样精度,逐次逼近型数模转换器的有效位数等指标均有优秀的性能表现。本研究能够可靠地采样各电池的电压,适用于锂电池均衡保护芯片的应用场合,有利于延长电池组的使用时间。

Aiming at the equalization protection of lithium batteries,a voltage sampling circuit based on the equalization protection chip for lithium batteries is designed.The lithium battery equalization pro-tection adopts the active equalization method.The voltage sampling circuit samples the voltage of two lithium batteries to monitor the difference between lithium batteries,and converts the data through an 8-bit successive approximation digital-to-analog converter.The equalization control logic is used to analyze the converted data and performs equalization protection for the lithium battery.The HHNEC 0.18μm BCD process is used for the design and verified by simulation.Simulation results show that the voltage sampling circuit has high voltage sampling accuracy,and the effective number of bits of the successive approximation type digital-to-analog converter and other indicators have excellent performance.It can reliably sample the voltage of each battery and is suitable for the application of lithium battery equalization protection chip,which is conducive to prolonging the use of battery packs.