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Registered Member #1329
Joined: Mon Feb 18 2008, 07:31PM
Location: Harwinton Connecticut
Posts: 53
Hello Folks, Ihave not posted here in a year or so, but have been reading from time to time. The topic of the SCR clamp is exactly what I was looking for.
You see I have a number of hockey puck SCRs and was trying to test a couple of them. I have always used large stud SCR's previous to this.
So after testing a few and finding them all bad, I realized something must be wrong with my method. I was just using clip leads and a load and the firing voltage. No clamp. Then I see all the concern in the SCR Clamping post, and wondered why?
I understand the reasons from a IR loss perspective, but it seems that there is more to it. Is there a pressure sensitive contact inside the puck?
Is that what its all about. Cuz after squeezing my SCRs ... they all work. It may sound stupid but I have never used this style before. Is this actually designed into the SCR?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Yes the clamping force is necessary, because there is nothing internally holding the outer electrodes to the inner silicon puck--the clamp provides the force to do that. Without the clamp you will get get a week (or nonexistant) connection that can also damage the die by causing current imbalances.
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The SCR clamp thread and a question
