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有趣的事实还在于，对于直流电压来说，电流越大，保险丝的熔断表现就越关键。普通的集成式保险丝只能用在不超过4A额定的交/直流输入环境下。若电流更大，150VDC以上的直流运行是不允许的。输入为230VAC时，整流后的电压已在320VDC左右，三相应用的变频器中间电路电压在360至900VDC之间，具体取决于源电压。
该问题已被重视。在当前的UL安规文档（实际应用指导手册）中已经精确描述了能够使用DC电压输入的电源的定义。其所使用的熔断保险丝必须能够及时熔断短路电流和过载电流，否则电源所处的环境就会产生危险的高温。
PULS普尔世可靠的解决方案
一台适用于高压直流电输入的电源必须满足以下两点：
配备合适的输入滤波器，能够过滤对地的高共模电压；
安装的熔断保险丝必须具备UL和IEC安规认证.
在15W到480W功率级别范围内，PULS普尔世可提供丰富的电源产品，这其中也包括经验证的允许直流输入的可靠电源产品。这些电源无论是在电气间隙及爬电距离的设计方面，还是在直流操作时的输入保险丝选择方面，均获得了许可。
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