LED Driver issue / Startup voltage issue

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neb

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#2669066 6-Mar-2021 15:47

wonderstuff:
I purchased a timer-relay from trademe (https://www.trademe.co.nz/Browse/Listing.aspx?id=2997473050) which allows the PSU to stabilise at 12V and this has solved the problem.

Just out of interest, would you be able to post a photo of the back of the circuit board? That rating of up to mains voltage (meaning 1-2kV if it's going to be UL rated) and 10A seems perhaps a trifle optimistic given the dimensions. I mean, it looks perfectly fine for lower-power DC use, but I wouldn't run it near its claimed limits.

wonderstuff

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#2669358 7-Mar-2021 10:01

>Just out of interest, would you be able to post a photo of the back of the circuit board? That rating of up to mains voltage (meaning 1-2kV if it's going to be UL rated) and 10A seems perhaps a trifle optimistic given the dimensions. I mean, it looks perfectly fine for lower-power DC use, but I wouldn't run it near its claimed limits.

Sorry, it is installed in a zippy box, under the house and cable tied up, so a bit challenging to get to now. As you say, should be fine for 12V DC.

If you are interested in the PCB for your own use, you could always ask the supplier to send a photo of the back - they are very responsive.

neb

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#2672040 11-Mar-2021 23:01

neb:
andrewNZ: Sounds like the inrush on the LEDs' is too high and the power supply is browning out.
Disconnecting the DC side will allow the power supply to charge the capacitors and then it can cope with the inrush.

If that is the problem, the OP could then look at inrush current limiting, for a DC supply rather than the usual mains-voltage input you could probably get by with an NTC thermistor and a MOSFET to switch it out of circuit once it's passing the full load.

Or you can use a dedicated device like this one, which you can get on a $30 eval board.

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