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[经验] 潮湿条件下的触摸和接近感应

2018-10-11 14:10:47  130 安森美 电容
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你进入洗衣房,洗衣机向四面八方喷水,在室内下雨!
我的新洗衣机有一个这样的新型花式触摸板,因此它可以防雨,但是它会在整个控制装置的水流下关闭吗?
我冲到控制面板并触摸“电源按钮”;
雨停了。
现代科技有效!
几十年来,水一直是技术的敌人,因为它具有破坏性的影响。
已知触摸传感器在与水接触时工作不正常(或根本不工作)。
安森美半导体的触摸和接近传感解决方案通过利用差分传感技术简化和加速设计,消除了在潮湿条件下运行的许多问题(溢出的液体或在雨中操作),长感应轨迹,在嘈杂的环境中运行
,以及特殊的装配技术。
差分传感自动中和电子噪声,因为两个输入都接收相同的信号,因此它会消除。
与单输入检测相比,差分检测要好5倍。
传感器引线长度由差分输入均衡。
感应引线之间的电容被中和。
印刷电路板上的感应图案仅需要在薄保护面板下方几毫米的气隙。
无需特殊光导或导电胶。
所有这些只是LC717A00和LC717A10电容式触摸IC的一部分。
有关更多信息,请查看电容式触摸传感器应用说明和设计说明。
本例中的触摸控制面板采用安森美半导体LC717A00电容式触摸IC设计,传感器布局简单,可在雨中操作!
那么洗衣机有什么问题导致它在所有东西上喷水?
填满滚筒的管道松动了。
在技​​术可能有帮助的情况下,你发生了什么不幸事件?

以上来自于谷歌翻译


以下为原文

You enter the laundry room and the washing machine is spraying water in all directions, it’s raining indoors! My new washing machine has one of these new fancy touch panels so it is sealed from the rain, but will it switch off with water running all over the controls? I make a dash to the control panel and touch the “Power Button”; the rain stops. Modern technology works!
Water has been the enemy of technology for decades because of its damaging effects. Touch sensors have been known to work improperly (or not at all) when they come in contact with water. ON Semiconductor’s solution to Touch and Proximity sensing simplifies and speeds up the design by utilizing a differential sensing technique that eliminates many of the problems with operating under wet conditions (spilt liquids or being operated in the rain), long sensing traces, operating in noisy environments, and special assembly techniques.
The differential sensing automatically neutralizes electronic noise as both inputs receive the same signal and thus it cancels out.  The differential detection is 5 times better compared to single input detection.
Sensor Lead length is equalized by the differential input. The capacitance between the sensing leads being neutralized.
The sensing pattern on the printed circuit board only needs a few millimeter air gap below a thin protective panel. No need for special light guides or conductive adhesives.
All of this is just part of the LC717A00 and LC717A10 Capacitive Touch IC. For more information please review Capacitive Touch Sensor Application Note and Design Note.
The Touch control panel in this example was designed using the ON Semiconductor LC717A00 Capacitive Touch IC and with a simple layout of the sensors it can be operated in the rain! So what was wrong with the Washing Machine to cause it to spray water over everything? The pipe that fills the drum had come loose.
What mishaps have happened to you where technology could have helped?

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