基于GMD1002芯片的电压采集系统设计与优化

Design and Optimization of Voltage Acquisition System Based on GMD1002

针对自研的车规级电池管理芯片GMD1002,设计了以STM32为主控芯片的电池电压采集系统以及数字滤波器。并采用精密电源和模拟电芯对系统的固定电压采集、斜坡电压采集及电压均衡性管理等性能进行了相关测试。结果表明:数字滤波器能有效降低瞬态脉冲的影响,固定电压读取误差在1 mV之内;在0~3.2768 V范围内,斜坡电压读取误差在2 mV以内。芯片内部的电池均衡控制性能正常,具有良好的电池管理功能。

The battery management chip monitors the health of battery by collecting battery voltage.It is able to provide battery protection and voltage equalization optimization.The accuracy of voltage acquisition is one of the main performance parameters of the battery management chip.Based on the self-developed vehicle-gauge battery management chip GMD1002,a battery voltage acquisition system with STM32 as the main control chip is designed.The digital filter is designed to match the voltage acquisition characteristics of the GMD1002 chip.High precision voltage source and battery simulator are used to test the performance of fixed voltage acquisition,ramp voltage acquisition and battery voltage equalization control of the system.The results show that the digital filter can effectively reduce the influence of transientpulses,the fixed voltage reading error is within 1 mV;and the ramp voltage reading error is within 2 mV in the range of 0~3.2768 V.T he battery equalization control function inside the chip is normal,and the system has a good battery management function.