AO204/SI

AO204/SI

AO204/SI

《联系人；欧先生》
《座机：0592-5709825》
《传真：0592-5917519》
《24小时热线：18030229053微信同步》
《QQ  ：2479261344》
《QQ邮箱：2479261344@qq.com》

从工业领域到建筑工程，简单易用的开关模式电源非常常见。直流电压随后被缓冲至电池，成为随时可用的安全电力供给。事实如此简单吗？

工频电源工作总是离不开变压器。输出的直流电，不管是调节的还是未调节的，都是首先在次级产生的。相比之下，开关电源是首先在初级进行整流，然后产生的直流电压被分割为高频，并通过一个小的高频变压器被传送到次级（图2）。开关电源允许宽范围的输入，还允许负载电流在0-100%的额定范围内连续工作。

图2: 无输入滤波器的开关电源原理图

在思考开关电源的输入电路原理时，首先注意到的就是整流器。如果输入不是交流电，而是直流电，将会发生什么？假设所有模块都能“准确”运行，那么几乎所有开关电源都可以直流电或者交流电输入。然而，当发生故障，一台不适用于直流电输入的开关电源，很有可能导致火灾，因为处理高压直流电比起处理交流电要危险得多。

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