继电器的小知识[ZT]

随风而去 发表于 2007-5-10 21:13:06

<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">继电器是电子电路中常用的一种元件，一般由晶体管、继电器等元器件组成的电子开关驱动电路中，往往还要加上一些附加电路以改变继电器的工作特性或起保护作用。继电器的附加电路主要有如下三种形式：<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> 1.<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">继电器串联<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">RC<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电路：电路形式如图<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">1<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，这种形式主要应用于继电器的额定工作电压低于电源电压的电路中。当电路闭合时，继电器线圈由于自感现象会产生电动势阻碍线圈中电流的增大，从而延长了吸合时间，串联上<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">RC<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电路后则可以缩短吸合时间。原理是电路闭合的瞬间，电容<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">C<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">两端电压不能突变可视为短路，这样就将比继电器线圈额定工作电压高的电源电压加到线圈上，从而加快了线圈中电流增大的速度，使继电器迅速吸合。电源稳定之后电容<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">C<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">不起作用，电阻<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">R<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">起限流作用。<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> 2.<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">继电器并联<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">RC<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电路：电路形式见图<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">2<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，电路闭合后，当电流稳定时<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">RC<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电路不起作用，断开电路时，继电器线圈由于自感而产生感应电动势，经<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">RC<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电路放电，使线圈中电流衰减放慢，从而延长了继电器衔铁释放时间，起到延时作用。<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> 3.<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">继电器并联二极管电路：电路形式见图<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">3<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，主要是为了保护晶体管等驱动元器件。当图中晶体管<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">VT<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">由导通变为截止时，流经继电器线圈的电流将迅速减小，这时线圈会产生很高的自感电动势与电源电压叠加后加在<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">VT<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">的<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">c<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">、<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">e<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">两极间，会使晶体管击穿，并联上二极管后，即可将线圈的自感电动势钳位于二极管的正向导通电压，此值硅管约<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">0.7V<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，锗管约<SPAN lang=EN-US style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">0.2V<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，从而避免击穿晶体管等驱动元器件。并联二极管时一定要注意二极管的极性不可接反，否则容易损坏晶体管等驱动元器件。
<SPAN style="FONT-SIZE: 13pt; COLOR: #333333; FONT-FAMILY: 宋体; mso-ascii-font-family: ''; mso-hansi-font-family: ''; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">

lianshuangling 发表于 2011-5-12 23:47:23

学习了谢谢楼主......

zhanglongjun 发表于 2011-5-14 20:57:43

搂主讲的东西虽然简单，但很实用

zhengsen13 发表于 2011-7-15 22:44:09

学习学习，关注关注啊。。。。。。。

零度开始 发表于 2011-7-17 07:47:53

本帖最后由零度开始于 2011-7-17 07:49 编辑

2.继电器并联RC电路：电路形式见图2，电路闭合后，当电流稳定时RC电路不起作用，断开电路时，继电器线圈由于自感而产生感应电动势，经RC电路放电，使线圈中电流衰减放慢，从而延长了继电器衔铁释放时间，起到延时作用。

这个地方有点想不通啊，如果没有这个放电回路，感生电动势没有地方放电，断开时间岂不是更长？？？

应该说电容里面存的电量持续给线圈供电，能够延时一段时间。不知道对不对啊？

20002009 发表于 2011-8-12 10:06:29

学习了，确实实用。现在懂这些并能实际应用的机会不多了。

rzhytc 发表于 2011-8-29 21:26:06

学习了谢谢楼主......

yutongv 发表于 2011-9-2 20:44:44

不错学习了液压配件www.wzxingwang.com

renjinh 发表于 2011-10-12 17:07:39

楼主可以讲一些开关、与继电器的电路

自由飞翔22 发表于 2011-10-12 23:30:35

谢谢楼主，学习了，又多长点知识了。

页: [1] 2

机械社区's Archiver

继电器的小知识[ZT]