AIO288/x

AIO288/x

AIO288/x

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在上述的所有情况下，直流源都能够提供大电流。一旦发生故障，必须安全切断短路电流或过载电流。而在交流电情况下能够完全适用的由石英砂构成的熔断保险丝，换在直流电压环境下，可能遇到重大的挑战。

问题在哪里？

重申：“通常情况”不是问题。但是仔细规划不放过任一可能性的技术人员眼中总能发现例外情况。这不代表对“通常情况”的保险，而是“意外险”。一台设定为交流电输入的电源，在通常情况下也能接直流电输入工作。但问题是，能保证不发生意外吗？大多数开关电源生产商都无法对此做出承诺。

在变频器中间直流总线下工作：

变频器的中间直流总线是由边缘陡峭的相对于保护地的高交流电压（共模电压）叠加而成的。接此类输入直流电的电源必须能够处理这种干扰，通常需要内置一个特殊滤波器。

熔断保险丝：

作为在发生故障时的最后的安全保障，电源中需要内置熔断保险丝。那么问题来了：电源所使用的这种类型的熔断保险丝是否能够在高直流电压下切断短路电流或者过载电流？首先，似乎短路情况下就存在问题，虽然不是必然的。例如，通过熔丝上的电流达额定电流的3倍。在这种类型的故障下，不适用于直流电的熔丝不能被可靠熔断，而由此产生的热量很可能引起火灾

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