台灯的触摸开关时什么原理?

2025-02-01 03:56:07
推荐回答(3个)
回答1:

触摸开关的原理:当人触摸电容屏时,由于人体电场,用户手指和工作面形成一个耦合电容,因为工作面上接有高频信号,于是手指吸收走一个很小的电流,这个电流分别从屏的四个角上的电极中流出,且理论上流经四个电极的电流与手指头到四角的距离成比例,控制器通过对四个电流比例的精密计算,得出位置。

电容式触摸屏的构造主要是在玻璃屏幕上镀一层透明的薄膜体层,再在导体层外上一块保护玻璃,双玻璃设计能彻底保护导体层及感应器。

扩展资料:

触摸开关按开关原理分类有电阻式触摸开关和电容式触摸开关,按接线方式分为单火线触摸开关和双线制触摸开关(火线和零线)。

从全球范围内来看,绝大多数国家都是采用单火线制布线规则,因此,早期触摸开关以单火控制为主导,随着应用的深入,零、火线控制的稳定性更高,开关的负载更大。市面上是以零、火线控制为主导。触摸感应的操作面板因为其坚固、耐磨损、可以绝缘、隔尘、隔水,而且外观美观新颖而迅速在很多领域被应用,成为热门技术。

参考资料来源:

百度百科-触摸开关

回答2:

单键触模式灯开关
这里介绍的触模式灯开关只用一个触摸电极片,就能完成开灯和关灯。触模式灯开关一样,采用相线进开关的两线制,可以直接取代普通开关而不必更改室内原有布线。
工作原理

触摸开关电路如图所示,图中虚线右部为普通电源布线,左部为触摸式灯开关线路。开关主回路由VDl一VD4和VS组成,集成块A等组成开关的控制回路o R51VD5和C3组成简单的电阻降压稳压线路,输出12V左右的直流电供控制回路等用电。 LED为弱光指示,用于夜间指示触摸开关的位置,方便使用。如不需要弱光指示,用导线将LED的正负引脚焊点短接即可。集成电路A是——块双D触发器,分别接成一个单稳态电路和一个双稳态电路。单稳态电路的作用是对触摸信号进行脉冲展宽整形,保证每次触摸动作都可靠。双稳态电路用来驱动晶闸管VS的开通或关闭。M是触摸电极片,手指摸一下M,人体泄漏的交流电在电阻R2上的压降,其正半周信号进入A的3脚即单稳态电路的CP端,使单稳态电路翻转进入暂态,其输出端Q即1脚由原来的低电平跳变为高电平,此高电平经R3向Cl充电,使4脚即R端电位上升,当上升到复位电平时,单稳态电路复位,1脚恢复低电平。所以每触摸一次电极片M,1脚就输出一个固定宽度的正脉冲。此正脉冲将直接加到11脚即双稳态电路的CP端,使双稳态电路翻转一次,其输出端Q即13脚电平就改变一次。当13脚为高电平时,VS的门极通过R4获得正向触发电流而开通,即电子开关闭合,电灯点亮发光。这时电容C3两端的电压会跌落到3V左右,发光管LED熄灭,但A仍能正常工作。当13脚输出低电平时,VS失去触发电流,当交流电过零时即关断,电灯熄灭。这时C3两端电压又能恢复到12V,LED点亮作弱光指示。由此可见,每触摸一次电极片M,就能实现“开”或“关”电灯的动作。元器件选择与制作A用CD4013型双D触发器数字集成电路,它采用14脚双列直插式塑封包装oVS采用MCRl00—8 2N6565型等小型塑封单向晶闸管.VD1-4用1N4004—1N4007型等硅整流二极管,VD5用12V、1/2W稳压二极管,如2CW60型等。LED可用红色发光二极管。
R5最好采用RJ—1W型金属膜电阻器,其余电阻均用RTX—l/8W型碳膜电阻器。C1 C2可用CT4型独石电容器,C3用CDll—16V型电解电容器。开关壳体采用86系列开关面板制作,为确保使用者绝对安全,可在触模电极片与电阻R1之间再串接一只2M高阻电阻此开关接入照明线路,接法与普通开关一样,按图所示即相线进开关,如将相零线位置接反,电路不能正常工作。电路装好后不用调试,通电后就能正常工作。模一下M,灯亮;再摸—下,灯灭。
触模式台灯的原理
http://www.cndzz.com/info/1636-1.htm

触摸它不亮是什么原因常见于内部小可控硅坏,极便宜,换只同型号的既可。
http://www.cndzz.com/info/1636-1.htm

回答3:

可以的,就是要接一个温度感应器。是个与门

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