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the easiest would be a SSR with zero cross switching built in. after that would be a triac driven with a zero cross optotriac. although the zero cross switching might be unnecessary for snubbing i've added a TVS to a digital wall timer to switch a pump for a hydroponic garden, but i'm not sure how kosher that is but it worked. otherwise the turn off spike would crash the timer
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I hooked up a test circuit with my triac and optocoupler to my solenoid valve. The solenoid was connected to 120vac. I used a 5v trigger to simulate the output from a uP. Worked the first time. Boom. (That's a good boom...not a chip getting fried boom).
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
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Posts: 600
Judging by the datasheet I just looked at, unless I'm missing something, that's pretty much ALL that's in there, so it doesn't sound like you're saving much with an SSR.
I don't think you save much with one SSR vs. making one up to about 20 amps. but if you need many SSRs or more than about 20 amps, building them becomes cheaper again.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You're saving the time and effort of doing the snubber calculations/tests. If you buy a SSR and it doesn't work with an inductive load, that's the manufacturer's fault. You're also saving the labour of assembling the parts into a module. Those two savings are worthwhile for industry people, so we have a market for ready-made SSRs.
For really nasty loads, I've used back-to-back SCRs with the gates driven by pulse transformers. I apply a high frequency pulse train during the whole time that the SCR is supposed to be on, so if it drops out from a lack of current, it'll fire again at the earliest opportunity. I also use extra drive voltage and soak some of it up in a potential divider that presents a 100 ohm load to the gate. I haven't found a load that this couldn't drive. It'll "dim" vacuum cleaners, NSTs, rectifiers with huge filter caps etc. Total overkill.
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triacs and triggering
