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