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Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
Location:
Posts: 55
It is possible to serialize SCRs like in the attached figure in order to switch great voltages? I have simulated them and seems to work fine, but I do not know if it works with real SCRs with little differences in parameters
Registered Member #223
Joined: Mon Feb 20 2006, 06:42PM
Location: Ottawa, Ontario, Canada
Posts: 125
what’s with the photo diodes? When you series them you need to switch them at the same time in order to avoid over-volting the other SCRs. What is your application? Single SCR's units are available up to 1200v or so which is enough from most coilgun/low voltage pulse applications. Anything with a higher voltage a triggered spark gap would be better since getting series SCRs to trigger at the same time can be difficult.
Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
Location:
Posts: 55
You are right: I switch all the photodiodes at the same time. I would use IR ones because nanoseconds response. My idea is that thyristors does not switch on until there is voltage at both gate and anode, so must activate all at same time. I need lots of kilovolts and do not like buying expensive scrs, so it is less costly buying less voltage ones and serialize. Bigest SCRs has at maximum ratings a maximum di/dt, so I think they are not suitable with capacitors banks discharge. Look at HSDL-5420 and 4420 pairs, they are fast and very cheap!
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
What are you trying to do with the stack? The schematic will work, but might not be so good for the general scr applications(coilguns 'n such). Check out TDU's site for some scr stacking experiences.
Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
Location:
Posts: 55
Self Defenestrate wrote ...
What are you trying to do with the stack? The schematic will work, but might not be so good for the general scr applications(coilguns 'n such). Check out TDU's site for some scr stacking experiences.
I want make main power supply and switch for different projects I do not known/found TDU´s site, what is it? Iwill read about coilgun, sounds powerful!
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Serializing SCRs
