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1756-EN2TR

开关电源的输入电路大都采用电容滤波型整流电路，在进线电源合闸瞬间，由于电容器上的初始电压为零，电容器充电瞬间会形成很大的浪涌电流，特别是大功率开关电源，采用容量较大的滤波电容器，使浪涌电流达100A以上。在电源接通瞬间如此大的浪涌电流，重者往往会导致输入熔断器烧断或合闸开关的触点烧坏，整流桥过流损坏;轻者也会使空气开关合不上闸。上述现象均会造成开关电源无法正常工作，为此几乎所有的开关电源都设置了防止流涌电流的软启动电路，以保证二手机器人电源正常而可靠运行。
如果采用“软启动电路”来消除开关电源启动时的浪涌电流，可以很好地避免上述传统浪涌电流限制方法的缺点。通过“软启动”来控制开关电源的启动以消除浪涌电流，包含这样两条设计原则：即在加电瞬间除去负载、同时限制有用的电流。如果不驱动负载，开关电源启动时一般电流很小。在很多情况下，启动电流实际有可能要比利用这种方法保持的稳态工作电流小。
浪涌电流指电源接通瞬间，流入电源设备的峰值电流。由于输出滤波电容迅速充电，所以该峰值电流远远大于稳态输出电流。电源应该限制AC开关、整流桥、保险丝、EMI滤波器件能承受的浪涌水平。反复开关环路，AC输入电压不应损坏电源或者导致保险丝烧断。

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1756-EN2TR

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