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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I have a few of these what I think are solid state relays that I removed from some old switching power supplies.
First, how do I use these? I input 4-7V dc on the two smaller terminals and the two big ones turn on, right? What is the switching element, scr/triac? Does it remain turned on until next zero crossing? Can this be used for the "solid state variac"?
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Since it specifies the output to be AC, it could be a triac inside. But it could possibly be two mosfets or two IGBTs in anti-series. In series but facing opposite ways, so Drain would be connected to Drain or Source to Source on mosfets
Easiest way to find out would be to take a 9v battery and a 50 ohm or so resistor across the output leads. Use another voltage source to provite a trigger voltage and then see if it stays on after the trigger is removed.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
If it's truly a "solid state relay", it's likely the two MOSFET drains are present on those output pins as ConKbot indicated.
Solid-state relays are typically optical/opto-isolated MOSFETs or IGBTs. I don't think they're intended to be driven in anything other than cutoff or saturation, because they're not designed to dissipate power (potted in epoxy).
Grab your ohmmeter out and check out the resistance that appears across the output pins when you apply 5V. If you get a reasonable (milliohms - tens of milliohms) resistance, it wouldn't surprise me if that they might be designed to be driven from 5V logic.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Bi lateral mosfet or IGBT switch is actually very cost-ineffective when compared to triacs for AC control. Just think how huge would mosfet need to be to maintain 1,5V drop at like 10amps.
Bilateral switches are largely used in those small integrated photo-relays and switch low voltages.
Since relay is 240V AC 16A I'm pretty much confident that it's a triac. Some guys work with these regularly on our forums and have confirmed that. For large inductive loads triac is also proffered because it doesn't interrupt current.
I guess you could check that by feeding it with some DC through output; triac will not turn off after turned on.
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Solid state relays
