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led ballast

led ballast

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Because an bad failure behaviour of one ballast, i decided to replace all old led ballasts in garden fixtures.
Now i converted with halogen transformer + led spot.

This is an working ballast at 11k hours (circa), but i don't think it is going to last.

this is the failed ballast:
http://www.lighting-gallery.net/gallery/displayimage.php?album=2569&pos=1&pid=104543
http://www.lighting-gallery.net/gallery/displayimage.php?album=2569&pos=0&pid=104544

IMG_3005.JPG IMG_3006.JPG IMG_2993.JPG IMG_2994.JPG

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Filename:IMG_3006.JPG
Album name:marcopete87 / Ballast
Keywords:Miscellaneous
File Size:590 KB
Date added:Feb 22, 2015
Dimensions:2465 x 1848 pixels
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URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-104610
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Medved
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Feb 22, 2015 at 10:32 AM Author: Medved
What I see there as another clear error is the rating of the R3:
It is clearly exposed to the full input voltage, where even when the dissipated power may be still OK, as far as I remember the 0805 (it isn't bigger than that) are rated for dielectric breakdown not above 300V. For such mains use you would need at least 750V rating, so at least 3 units (or 2x of the 1206 size) in series. That would really be the absolute minimum...

No more selfballasted c***

marcopete87
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Feb 22, 2015 at 05:10 PM Author: marcopete87
so, this is an "nice" design... nice to firefighters!

Medved, do you think the electrolitic cap is going to leak?
http://www.lighting-gallery.net/gallery/displayimage.php?album=2569&pos=0&pid=104611

i don't know why leak appear in the same side of failed ballast cap (positive).
Medved
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Feb 22, 2015 at 11:31 PM Author: Medved
If the mess would be around both leads, I would be guessing for a soldering flux residue.
But as it is just around the positive, I'm afraid you are right, the cap is failing...

It is more around the positive, because the material transport caused by the electrolysis tends to keep the negative side plugged...

No more selfballasted c***

marcopete87
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Feb 23, 2015 at 05:21 PM Author: marcopete87
ok, thank you again Medved!
How about 12V led lamp with electronic halogen transformer?
I replaced 3 lamps with this combination (i'm using them as testing).
Medved
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Feb 23, 2015 at 11:30 PM Author: Medved
If there is at least one 20W halogen left on the secondary (to keep the "transformer" circuit oscillating properly), it usually works. Without that the "transformer" does not operate correctly and usually leads to flicker and even stresses in the LED's (equivalent to power ON surge charging the capacitor, but happening every mains half cycle, so every 10ms).
But anyway, these have limited length of the output wires to just about 2m, can not imagine that for a garden installation...

No more selfballasted c***

marcopete87
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Feb 24, 2015 at 12:09 AM Author: marcopete87
I put transformer in pilon (10cm of wire) and seems to work fine without visible flickering (i choosed an low power power supply, max 60W).
Medved
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Feb 27, 2015 at 01:16 PM Author: Medved
And what about leaving all the installation with 12VAC in all the garden wiring and put the common toroid transformer into the fuse box in house?
And I doubt those "halogen transformers" would be anything more reliable than the LED ballasts, mainly when in the same price range...

No more selfballasted c***

marcopete87
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Feb 27, 2015 at 01:28 PM Author: marcopete87
i can't, because 230v will be mixed with 12vac due common neutral and an 230v pl lamp.
However, this is for testing pourpose, so in future i can remove 230v and buy some 12v 2A toroid transformer (this have 5 sections), but it don't have fuses at all, because it have only RCD and circuit breakers.
Medved
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Feb 27, 2015 at 01:45 PM Author: Medved
With "fuse box" I mean the box, where is all the protection, so in your case the circuit breakers,...

And indeed, mixing with 230V circuit is not acceptable at all. It would have to be either all kept as 230V, or all switched over to the 12V (so all 12 LED's). With LED's the standard 5A circuit should be able to handle the power even at 12V...

No more selfballasted c***

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