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Trigger an SCR to switch a negative voltage
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Riccardo
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« Reply #14 on: February 23, 2010, 05:55:40 PM »
Yes, that is what I thought, and that is what the wiki says. I was hoping Lyker would explain how he thinks that a resistor can change this as he seems quite adamant that it can be done.
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Alex Tsekenis
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« Reply #15 on: February 23, 2010, 06:26:32 PM »
He is right, Rgk does affect holding current.

I found these documents:

http://www.littelfuse.com/data/en/Application_Notes/AN1001.pdf
http://www.teccor.com/data/en/Application_Notes/AN1008.pdf
http://us.st.com/stonline/products/literature/an/3563.pdf

Especially the last one on page 7 has a graph that you will find useful.

I was not aware of this. I am not sure why this is so. Anyway, very useful.
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Regards,
Alex

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sharilewis
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« Reply #16 on: March 30, 2010, 05:07:19 AM »
I would check the holding current of the SCR you use, it needs to be greater than 1A in your circuit. Also, limit the gate pulse current with a resistor. That resistor will also have an affect on the holding current.
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Lyker
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« Reply #17 on: April 19, 2010, 12:16:40 PM »
An echo or a parrot?  Huh
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