{"id":5936,"date":"2019-04-03T15:37:40","date_gmt":"2019-04-03T07:37:40","guid":{"rendered":"https:\/\/www.langir.com\/?post_type=news&p=5936"},"modified":"2025-10-31T16:57:29","modified_gmt":"2025-10-31T16:57:29","slug":"piezo-switch","status":"publish","type":"news","link":"https:\/\/www.langir.com\/de\/news\/piezo-switch\/","title":{"rendered":"Piezo-Schalter"},"content":{"rendered":"
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Piezo switches<\/h1>\n\n\t\t<\/div>\n\t<\/div>\n
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\"Piezo<\/div>\n\t\t<\/figure>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n\t
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A\u00a0piezo switch<\/b>\u00a0is an electrical\u00a0switch<\/a>\u00a0based on the\u00a0piezoelectric effect<\/a>.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t

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A piezo switch<\/a>(sometimes referred to as Touch metal piezo switch) is an electrical switch based on the piezoelectric effect, designed to be installed in a location (or device) and application where they may be subject to vandalism or tampering, as in the case of pedestrian crossing switches, or fraudulent or unauthorized use, as in the case of vending machine switches. Anti vandal switch that are located on devices that are accessible to the public or which are located outside also have to be able to withstand dust, rain, snow, and frequent operation.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t

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The charge generated by the piezoelectric element in the switch is typically used to turn on an integrated semiconductor device such as a field effect transistor (FET), causing the switch assembly\u2019s output to be active, or \u201con\u201d. When the FET is on, current can flow through it as with a conventional metal contact-based switch. After the voltage pulse is dissipated in the gate resistor, the FET turns back \u201coff\u201d, its normal high impedance state. The piezoelectric effect is the generation of electric charge when certain materials are under stress. In the case of piezo switches<\/a>, the force could be compressive pressure that causes the (typically disc-shaped) piezo element to bend very slightly like a drumhead.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t

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Thus piezo switch<\/a> produce a single, brief \u201con\u201d pulse. This pulse can vary with the amount of pressure which is applied, since higher pressures generate higher voltages which take longer to dissipate. A capacitor may be used to store the charge to lengthen the time constant of the gate circuit and therefore the width of the pulse. With additional circuitry this pulse can be extended further or used to change the state of an output from steady \u201cOff\u201d to steady \u201cOn\u201d by toggling a flip-flop.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

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Advantages<\/h3>\n\n\t\t<\/div>\n\t<\/div>\n\n\t
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Piezo switch<\/a> have some interesting advantages over their conventional mechanical counterparts. One is that there are no moving parts, just the small deformation on the front plate and the piezo element (typically a few micrometers). This means the lifetime of such a switch can be ensured to be tens of millions of operations, since there is no wear involved. Another advantage is that they may easily be completely sealed from the environment and thus made weatherproof. They are often constructed with stainless steel housings such that they are resistant to damage by vandals or heavy use.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t

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Conventional electromechanical switches have moving parts that inevitably wear out
\nThe reliability of the electromechanical switches can be reduced by contaminants such as moisture and dust that will foul contact points
\nThe solution is a piezo switch<\/a> with no moving parts<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

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How a piezo switch working?<\/strong><\/h3>\n\n\t\t<\/div>\n\t<\/div>\n\n\t
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\"Piezo-switch-wiring-schemes-2wire\"
Piezo switch<\/figcaption><\/figure>\n<\/div>\n