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Topic: Diode in SERIES with Relay Coil (Read 674 times) previous topic - next topic

mech_eng

Jun 22, 2013, 05:00 pm Last Edit: Jun 22, 2013, 05:03 pm by mech_eng Reason: 1
What would be a good diode to prevent a NO relay from closing when reverse polarity is applied to a circuit via a drunk wiring said circuit by placing a diode in series with the coil, assuming relay current is less than 300mA?

Note: This is NOT for back EMF protection, just trying to prevent frying a SABERTOOTH if  wired up backwards and flip on the switch which controls a relay

Grumpy_Mike

Use a series diode rather than a parallel one. To minimise voltage drop use a Shockley diode.
http://en.wikipedia.org/wiki/Shockley_diode

Henry_Best


Use a series diode rather than a parallel one. To minimise voltage drop use a Shockley diode.
http://en.wikipedia.org/wiki/Shockley_diode

Did you really mean a Shockley diode or did you mean a Schottky diode?

Grumpy_Mike



Use a series diode rather than a parallel one. To minimise voltage drop use a Shockley diode.
http://en.wikipedia.org/wiki/Shockley_diode

Did you really mean a Shockley diode or did you mean a Schottky diode?


OK
http://en.wikipedia.org/wiki/Schottky_diode
I am dyslexic.

PeterH

I haven't got my head around the circuit that this would be protecting, but if you want to arrange that a solenoid can be operated by a forward voltage but not a reverse voltage then a series diode seems to me to be a sensible way to do it.
I only provide help via the forum - please do not contact me for private consultancy.

Henry_Best




Use a series diode rather than a parallel one. To minimise voltage drop use a Shockley diode.
http://en.wikipedia.org/wiki/Shockley_diode

Did you really mean a Shockley diode or did you mean a Schottky diode?


OK
http://en.wikipedia.org/wiki/Schottky_diode
I am dyslexic.


So is my son, so you have my sympathy.

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