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Documents 开关电源的各个功能
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  • Author Author: bluesea
  • Date Created: 24 Sep 2009 3:27 AM Date Created
  • Last Updated Last Updated: 7 Oct 2021 12:36 AM
  • Views 576 views
  • Likes 0 likes
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Related
Recommended

开关电源的各个功能

开关电源主要包括输入电网滤波器、输入整流滤波器、变换器、输出整流滤波器、控制电路、保护电路、辅助电压电路等。它们的功能是:

  1.输入电网滤波器:消除来自电网,如电动机的启动、电器的开关、雷击等产生的干扰,同时也防止开关电源产生的高频谐波向电网扩散。

  2.输入整流滤波器:将经过输入电网滤波器滤除杂波的输入电压进行整流滤波,为变换器提供直流电压。

  3.变换器:是开关电源的关键部分。它把从输入整流滤波器输出的直流电压变换成高频交流电压,并且起到将输出部分与输入电网隔离的作用。它的工作原理像个开关,这就是叫“开关电源”的原因吧。
  4.输出整流滤波器:将变换器输出的高频交流电压整流滤波得到需要的直流电压,同时还防止高频噪声对负载的干扰。

  5.控制电路:检测输出直流电压,并将其与基准电压比较,进行放大。调制振荡器的脉冲宽度,从而控制变换器以保持输出电压的稳定。

  6.保护电路:当开关电源发生过压、过流、短路时,保护电路使开关电源停止工作以保护负载以及电源本身。


  7.辅助电压电路:其实它本身也是一个完整的开关电源,输出+5VSB电压,为主板待机电路供电。同时也为保护电路、控制电路等电路供电。

  至于智能稳控电路,虽然现在是某些电源的一部分,但是它不属于组成开关电源的必须电路,只是厂家设计的一个特色部分,可是它的优点是可见的,相信它也会像主板的“软跳线”一样得到普及。image

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