有個現實的問題 現在大家所用的設備電源品質都不好
沒有pfc 所以對於電源系統產生三次諧波
https://www.powersoft.com/en/abo ... -mode-power-supply/
這一段話其實值得玩味:
less emissions on the cables because of the lower harmonics of the mains frequency. This produces less hum and induced distortion because of perturbed mains;