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Car Magnetic Contact

A magnetic field (from an electromagnet or a permanent magnet) will cause the reeds to attract each other, thus completing an electrical circuit. The spring force of the reeds causes them to separate, and open the circuit, when the magnetic field ceases. Another...

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Car Magnetic Contact

A magnetic field (from an electromagnet or  a permanent magnet) will cause the reeds to attract each other, thus completing  an electrical circuit. The spring force of the reeds causes them to separate,  and open the circuit, when the magnetic field ceases. Another configuration  contains a non-ferromagnetic normally-closed contact that opens when the  ferromagnetic normally-open contact closes. A thin layer of non-ferromagnetic  material is applied to the reed switch contact area to serve as an electrical  contact switching (wear) surface and, for normally-open contacts, as a magnetic  spacer whose thickness is important in controlling the magnetic field level at  which the contact opens (the drop-out). Reed switch contacts are typically Rh,  Ru, Ir, or W. There are also versions of reed switches with mercury  "wetted" contacts. Such switches must be mounted in a particular  orientation. Otherwise drops of mercury may bridge the contacts even when not  activated.

 

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WHAT IS THE REED SWITCH (REED SWITCH) RELEASE TIME?

The reed switch (reed switch) release time is the time required for the switch to turn on after the magnetic field is removed. Taking a relay as an example, when the coil power is turned off, a large back-EMF generation results in rapid opening of the reed. The release time is about 20 μs to 50 μs. If a diode is connected across the coil, this eliminates the back-sensing pulse pressure (which can be from 100V to 200V) and the switch turn-on time is slowed down to about 300μs.

Some designers need a short release time, but they cannot have potential back-sensing pulse-voltage coupling in sensitive digital circuits, so they add a 12 V to 24 V Zener diode in series with a rectifier diode and Coils are connected in parallel. At this time, when the coil power is turned off, the voltage is the reversed Zener voltage value, so that the switch can be turned on within 100 μs.



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