AIO288/x
AIO288/x
AIO288/x
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在上述的所有情況下，直流源都能夠提供大電流。一旦發生故障，必須安全切斷短路電流或過載電流。而在交流電情況下能夠完全適用的由石英砂構成的熔斷保險絲，換在直流電壓環境下，可能遇到重大的挑戰。
問題在哪里？
重申：“通常情況”不是問題。但是仔細規劃不放過任一可能性的技術人員眼中總能發現例外情況。這不代表對“通常情況”的保險，而是“意外險”。一臺設定為交流電輸入的電源，在通常情況下也能接直流電輸入工作。但問題是，能保證不發生意外嗎？大多數開關電源生產商都無法對此做出承諾。
在變頻器中間直流總線下工作：
變頻器的中間直流總線是由邊緣陡峭的相對于保護地的高交流電壓（共模電壓）疊加而成的。接此類輸入直流電的電源必須能夠處理這種干擾，通常需要內置一個特殊濾波器。
熔斷保險絲：
作為在發生故障時的最后的安全保障，電源中需要內置熔斷保險絲。那么問題來了：電源所使用的這種類型的熔斷保險絲是否能夠在高直流電壓下切斷短路電流或者過載電流？首先，似乎短路情況下就存在問題，雖然不是必然的。例如，通過熔絲上的電流達額定電流的3倍。在這種類型的故障下，不適用于直流電的熔絲不能被可靠熔斷，而由此產生的熱量很可能引起火災
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