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Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
I have been looking for several days now for a place that carries high voltage, high amperage SCRs, like the ones that are used here for capacitor discharge into rail guns and coil guns. I would order from E-bay, however I need several identical ones for a reasonable amount of money. For now I need 4kA 500V modules, but I may need something even larger in the future. Neither Digikey or Mouser, which appear to be the popular sources here, look like they have what I am looking for, although Mouser looks like it is great for just about everything else.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
And if digikey or mouser did have an item like that, i have no doubt you'd pat thru the nose for it.
I can't really suggest a place to look, but dont stop watching Ebay. I have 4 identical 1kV 400A 5.1KApk puck-type SCRs I got for $40 on Ebay, and they came pre-clamped (on massive heat sinks, but who cares). Unfortunately for me I un-clamped them because I needed the heatsinks for another application.
I'd offer to sell them ,but now I too have some massive capacitors!
You will often find them sold in fours like this, because they are used in a bridge configuration in massive light dimmers.
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
New question: After looking at CH Technologies (thanks rp181) i found this beauty among more moderately sized modules. However, they did not have 'SCRs' but a good deal of Thyristors. Are these the same things as SCRs? I have heard of them being used as high voltage pulse switches, but I have no understanding of how they work. Would they work on my test bed of 60J @ 300V or on my full scale project of 1-5kJ @ 450-900V? Also, since CH Tech requires a quote, how much did you pay for your stud SCR's rp181, if you don't mind sharing?
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
thyristors used to mean a two terminal device, 4layer npnp structure, voltage triggered switch. Basically an SCR with out the gate, and triggered by a controlled forward breakdown.
edit: and ofcourse digikey has pucks,
but i would try ebay first, if you have a tight budget.
Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
Electroholic wrote ...
thyristors used to mean a two terminal device, 4layer npnp structure, voltage triggered switch. Basically an SCR with out the gate, and triggered by a controlled forward breakdown.
edit: and ofcourse digikey has pucks,
but i would try ebay first, if you have a tight budget.
Atleast in Finland "thyristor" means exactly the same thing as an SCR.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Electroholic wrote ...
thyristors used to mean a two terminal device, 4layer npnp structure, voltage triggered switch. Basically an SCR with out the gate, and triggered by a controlled forward breakdown.
What you describe is a DIAC. Some say that SCR and TRIAC are both a type of thyristor, others say that SCR and thyristor is the same thing.
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