通过单片机stm32f103rbt6来采集充电回路上的电流和电压，然后经过算法处理后输出相应的PWM信号来驱动开关管，从而控制BUCK电路实现对锂电池的闭环充电控制。(Through the MCU stm32f103rbt6 to collect the charging current and voltage loop, and then through the algorithm outputs the PWM signal co