Serializing SCRs
Fusion, Wed Aug 30 2006, 07:08AMIt 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
Re: Serializing SCRs
dan, Wed Aug 30 2006, 07:19AM
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.
dan, Wed Aug 30 2006, 07:19AM
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.
Re: Serializing SCRs
Fusion, Wed Aug 30 2006, 01:09PM
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!
Fusion, Wed Aug 30 2006, 01:09PM
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!
Re: Serializing SCRs
Steve Conner, Wed Aug 30 2006, 01:23PM
Terry Fritz's SISG system (described elsewhere on this board) is the best solid-state high voltage switch I've ever seen anywhere. Ever.
Steve Conner, Wed Aug 30 2006, 01:23PM
Terry Fritz's SISG system (described elsewhere on this board) is the best solid-state high voltage switch I've ever seen anywhere. Ever.
Re: Serializing SCRs
Fusion, Wed Aug 30 2006, 04:58PM
I suposoe to be:
Did it work?
Thanks!
Fusion, Wed Aug 30 2006, 04:58PM
I suposoe to be:
Did it work?
Thanks!
Re: Serializing SCRs
Self Defenestrate, Thu Aug 31 2006, 04:46AM
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.
Self Defenestrate, Thu Aug 31 2006, 04:46AM
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.
Re: Serializing SCRs
Fusion, Thu Aug 31 2006, 07:59AM
I do not known/found TDU´s site, what is it?
Iwill read about coilgun, sounds powerful!
Fusion, Thu Aug 31 2006, 07:59AM
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 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 do not known/found TDU´s site, what is it?
Iwill read about coilgun, sounds powerful!
Re: Serializing SCRs
Fusion, Fri Sept 01 2006, 06:34AM
I seen they use a spring powered switch. As I can see they not only switch active but also return.
Here are the best SCRs that I found:
Fusion, Fri Sept 01 2006, 06:34AM
I seen they use a spring powered switch. As I can see they not only switch active but also return.
Here are the best SCRs that I found:
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