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How to choose TVS diodes to dispel flyback surges from relay coils?
NiHaoMike:
--- Quote from: calzap on February 08, 2020, 07:36:44 am ---I know essentially nothing about practical use of opto-coupled triacs. I'll have to educate myself. Thanks for the suggestion.
--- End quote ---
Those are better known as SSRs.
calzap:
--- Quote from: NiHaoMike on February 08, 2020, 01:35:22 pm ---
--- Quote from: calzap on February 08, 2020, 07:36:44 am ---I know essentially nothing about practical use of opto-coupled triacs. I'll have to educate myself. Thanks for the suggestion.
--- End quote ---
Those are better known as SSRs.
--- End quote ---
OK. I was sleepy and should have realized that. :=\ Those I've used before.
DBecker:
--- Quote from: NiHaoMike on February 08, 2020, 01:35:22 pm ---
--- Quote from: calzap on February 08, 2020, 07:36:44 am ---I know essentially nothing about practical use of opto-coupled triacs. I'll have to educate myself. Thanks for the suggestion.
--- End quote ---
Those are better known as SSRs.
--- End quote ---
'SSR' usually refers to an assembly that includes an opto-isolated triac triggering a power triac, along with a handful of other components (input resistor, noise filtering, snubber).
ffrige:
@calzap: just curious, did you end up putting those TVS diodes parallel to the load or parallel to the switch? I wonder if the second option is better, because it keeps the voltage across the switch lower. Thanks!
wraper:
--- Quote from: jonpaul on February 05, 2020, 07:01:45 pm ---Use ordinary diode, 1N4004 for small relays, not a transient absorbing Zener
Jon
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Using regular diode has a huge downside. Relay turns off much slower, thus you will get way more contact arcing/ wear. https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=13C3311_AppNote&DocType=CS&DocLang=EN
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