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[DPRG] calculating diode protection in snubber circuit.

Subject: [DPRG] calculating diode protection in snubber circuit.
From: Rick Bickle rbickle at intconsys.com
Date: Mon Nov 20 09:55:54 CST 2006


I would think that the diode should at least be able to handle the coil
current. When the coil is turned off, it will continue the same current
flow for a short time. The voltage rating should be the coil voltage
plus a safety margin. Sounds like You're OK with 1A diodes.


-----Original Message-----
From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org] On
Behalf Of William James
Sent: Monday, November 20, 2006 8:37 AM
Subject: [DPRG] calculating diode protection in snubber circuit.

I am checking out some diodes in a snubber circuit and would like to
know if they are hefty enough. Does anyone know the calculations or rule
of thumb for calculating what size a diode needs to be. 

The schotsky diode are placed across the coil in a relay. The resistance
of the coil is 1.3kOhms and the voltage is 24 volts. That means that the
coil is drawing 18mA.  The diodes are rated for 1 amp. I don't know the
inductance of the coil. 



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