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PWM输出每隔大约4.1s突变一次不知道是哪里有问题



以下图片是占空比固定为53%的PWM信号,示波器时间刻度由 5s/格 逐渐变小

请注意  5s/格  的波形,每隔大约4.1s就会突变一次(所以我在调试数字电源的时候主电路每隔4.1s主电路波形就受此影响突变一下)