系统以STM32单片机作为核心控制芯片，利用其内部的PCA模块产生SPWM信号，再通过脉冲分配电路、逆变功率驱动电路和LC串联滤波电路获得三相逆变器50Hz正弦波功率信号的输出。(System to STM32 microcontroller as the core control chip, SPWM signal generated by PCA module inside, and then through the output