Electronics > Projects, Designs, and Technical Stuff
SSR vs mosfet with drivers, why is SSR so slow?
langwadt:
I've used back-to-back fets controlled by an isopower icoupler
T3sl4co1l:
10A but serial data or "2V signal to another pin"?
Are you sure you want all this functionality in a single device?
Such a description might actually be possible with GaN transistors these days, but it's not going to be cheap.
There is good reason why there are many kinds of optos and switches available today. It's not practical to use one for everything. :)
Tim
sourcecharge:
--- Quote from: JohanHoltby on August 30, 2019, 11:15:49 pm ---Sadly I don't know what I'm switching ;). It's a generic test module so it can be serial data, a 2 volt signa to an other pin on the DUT or maybe a supply current.
--- End quote ---
Well, I was going to suggest back to back mosfets too, but I think you could possibly damage the ICs, DUTs, or PS if the cutoff safety module grounds out the input to the test equipment.
My suggestion would be using zeners as + and - voltage bleeders, with a super quick burn fuse in series instead. Not sure if the fuse would burn in 1us though...
--- Quote from: langwadt on August 30, 2019, 11:58:38 pm ---I've used back-to-back fets controlled by an isopower icoupler
--- End quote ---
Can this be used without grounding one side of the back to back mosfets?
langwadt:
--- Quote from: sourcecharge on August 31, 2019, 10:56:55 am ---
--- Quote from: JohanHoltby on August 30, 2019, 11:15:49 pm ---Sadly I don't know what I'm switching ;). It's a generic test module so it can be serial data, a 2 volt signa to an other pin on the DUT or maybe a supply current.
--- End quote ---
Well, I was going to suggest back to back mosfets too, but I think you could possibly damage the ICs, DUTs, or PS if the cutoff safety module grounds out the input to the test equipment.
My suggestion would be using zeners as + and - voltage bleeders, with a super quick burn fuse in series instead. Not sure if the fuse would burn in 1us though...
--- Quote from: langwadt on August 30, 2019, 11:58:38 pm ---I've used back-to-back fets controlled by an isopower icoupler
--- End quote ---
Can this be used without grounding one side of the back to back mosfets?
--- End quote ---
everything on the output side is floating, that's what the icoupler is for.
here's a schematic of someone doing something similar,
https://m.eet.com/media/1179930/f1l.jpg
Richard Crowley:
Remember that most SSRs have built-in zero-crossing circuits which turn on only during the period when the mains waveform passes through zero volts. That would completely circumvent an kind of phase-angle triggering. You must be careful to get a SSR that allows phase triggering. I just assume that all SSRs are zero-crossing unless proved otherwise.
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