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Registered Member #580
Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
When using a mains constant current LED driver in series with a solid state relay, when 'off' the LEDS keep flashing. What method should be used to stop this from happening?
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Use a real coil'n'contacts relay, which has an off current much nearer to zero, than an SSR, whose off current is clearly enough to keep your load active.
Either that, or parallel a heavier load, like a light bulb, with your constant current LED driver input, to load the SSR's off current to below the driver's minimum working voltage. A bulb would be the ideal load for this, as cold, its resistance is an order of magnitude lower than hot, so it will load better when cold, and waste less when hot.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
'normally' the led + resistor would be an indicator across the actual load, which would be of low enough resistance to ensure that the L.E.D. does not illuminate.
Why use an SSR to drive just an LED? Try it with your intended main load and the LED will not light.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
It's probably the current through the snubber capacitor is enough to turn the LED on. I would think that a resistor in series with the LED driver circuit would knock the volts low enough to switch it off more reliably; perhaps 100k or so; it forms an RC circuit with the snubber which would be about 1e-6F, so you want the roll off to be well below the mains frequency, so that would be about 1.6 hz, sounds OK unless I've stuffed the maths up (quite possibly).
Registered Member #580
Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
Sulaiman wrote ...
why use an SSR to drive just an LED?
There is a reed switch, switching the SSR, switching the constant current driver, to a string of LEDs.
Apparently there is a concern about the "wasted electricity" caused by the flashing LEDs, or by the solution put in place to stop the flashing which would use even more. I then showed its less than 1 watt and cant even measure it and that the low voltage control transformer uses 1w constantly.
Registered Member #2529
Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
If you're using a snubber cap with the SSR then you may be able to replace it with a faster TRIAC with better dv/dt characteristics and ditch the snubber entirely.
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Mains constant current LED driver wont turn 'off'
