说明：  自己搭的发生PWM波转换的电路，以及使用此实验电路所产生的脉冲波形，用示波器测试，看是否对大家有帮助
(The occurrence of their own ride wave PWM conversion circuit, and the use of the experimental circuit generated by the pulse waveform, oscilloscope test to see if there is help for everyone)