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Registered Member #215
Joined: Sun Feb 19 2006, 09:14PM
Location:
Posts: 30
Ok, well I've been doing research and looking into this kinda thing, but it's confusing the hell out of me. I found a few site that showed me this:
What's the 9v battery for? It looks like he's running it in series with his bank voltage so it will appear +9v more. Resistor is obvisly for limiting current to the gate. Is that the proper way to trigger an SCR? [To have a higher gate voltage then anode?]
Link to site:
It's been a long week...maybe I'm just not thinking strieght...
Thanks once again for all your help...you guys are lifesavers...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
A voltage between gate and cathode, and the current that it causes to flow, is what triggers the SCR. So there's a mistake in that schematic which shows the trigger voltage connected between gate and ANODE (or the cap bank connected backwards)
Registered Member #215
Joined: Sun Feb 19 2006, 09:14PM
Location:
Posts: 30
So basicly, instead of attaching the 9v negitive to the anode, it should be connected to the cathode? Seems easy enough...is there any other precaution I should be aware of doing it this way? I dont want my 9 volt battery to go 'pop' Already blew up a AA battery...but that was another project
Registered Member #215
Joined: Sun Feb 19 2006, 09:14PM
Location:
Posts: 30
Aight, well I tried sample circuit #1, and the LED turns on, but the thyristor won't latch. Is this normal for a huge power SCR like this? I have a 5P4M SCR in a TO-220 package which latches normally when tested in this manner.
[Edit: Currently reading the wiki page, whoever drew those pictures has some mad paint skills ]
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
the larger teh SCR the more power needed for it to latch. I think that you need about .5a for it to stay latched, and about .3a on the gate to trigger it.
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Triggering SCR's
Let me grab you a datasheet here... [this isnt the one in the pic, just used it as an example]
Voltage code = 12 [1.2kV]
Already blew up a AA battery...but that was another project 
