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and relay coil spike suppression

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nuckollsr(at)cox.net
Guest

Posted: Thu Aug 24, 2006 7:19 am Post subject: and relay coil spike suppression

At 07:15 AM 8/23/2006 -0700, you wrote:



 	  Quote: 	
		  



You missed my point and I am sorry.



I was looking for a statement from industry where the uni-directional 

transorb was NOT to be used. That its not mentioned to me says its OK as 

it is really a zener or a simple diode if properly connected and the 

voltage ratings recognized.



I know of no such statement as while it may be a silly application it will 

work just fine.


	


    I guess I misunderstood the term "work". If one selects a zener

    diode for some application, it's easy to assume that the designer

    needs the functionality of the device as a zener.

 	  Quote: 	
		  I was expecting a simple " its a stupid application but you are right" 

from you.


	


    I thought we were discussing the pros/cons of recommended

    techniques and the idea that your argument was offered as

    an off-topic ringer didn't occur to me. You wrote:



 >Please tell the LIST (specific link please) where a 50V uni-directional

 >Transorb device (properly connected) is different from a 50v diode

 >in coil suppression or forward conduction for that matter.



 >Of course if you use a Transorb alone as a diode its no better

 >than a diode so that configuration is not addressed.



    I missed the significance of the last sentence so

    I went off and crafted . . .



http://www.aeroelectric.com/temp/Relay_Coil_Suppression.pdf



    which illustrates the point.  My suggestion is that

    thrashing this little tid-bit added no value for those

    who choose to follow this thread. I will offer the following

    revision to what I wrote to wit:



    WAS: "In fact, you cannot use a uni-directional Transorb (or

         plain vanilla zener) unless combined with a diode to

         prevent forward conduction as shown in multitudes of

         catalogs and literature on relays."



    NOW: There is no practical value in utilization of a single

         unidirectional Transorb (or plain vanilla zener) because

         its functionality is limited to behavior that mimics

         the use of an ordinary diode as illustrated in cases

         3/4 and 5/6 in the link cited above.



         The industry wide practice for using a zener

         in the coil suppression network of relays is illustrated

         in cases 7/8 were the zener is turned over and a

         diode added to prevent forward conduction. In this

         instance, the zener's unique qualities as a voltage

         clamping device provide the desired spike suppression

         characteristics while minimizing effects on relay

         drop out delay.



     Bob . . .

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paulm(at)olypen.com
Guest

Posted: Thu Aug 24, 2006 11:53 am Post subject: and relay coil spike suppression

The end.



Clearly you are unwilling to say the bi-transorb is just as good as a diode 

and in some cases better.



Its time to say good by to this line of discussion



Paul

---

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nuckollsr(at)cox.net
Guest

Posted: Thu Aug 24, 2006 2:30 pm Post subject: and relay coil spike suppression

At 12:34 PM 8/24/2006 -0700, you wrote:



 	  Quote: 	
		  



The end.



Clearly you are unwilling to say the bi-transorb is just as good as a 

diode and in some cases better.



Its time to say good by to this line of discussion


	




    My sincere apologies . . . if that's what you were arguing, then

    no problem. I thought I made it clear that I had no argument with

    using ANY of the coil suppression techniques suggested by a whole

    variety of authors INCLUDING the bi-transorb, bi-filar coils, cap-resistor,

    resistor, diode-zener, diode or any other technique one wishes to

    embrace.



    The sum and substance of my position was (and still is) that I can

    demonstrate no reason for anyone to FAVOR any of those techniques over

    the others for the purpose of increasing relay life. In particular,

    I was objecting to a "new and improved" approach to selling coil

    suppression when, like laundry soap, the ultimate choice of any

    flavor would perform just fine. Under those circumstances, there's

    no reason for anyone to jerk out existing technologies based on concerns

    for shortened relay life . . . and similarly no reason not to

    use the most inexpensive or convenient technology at hand. That's

    what I meant by "practical value". Beyond that, anything that

    floats your personal boat will work just fine too. My head is

    always calculating the return-on-investment/cost-of-ownership

    considerations so my personal boat floats just fine on diodes.

    Bob . . .

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