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Which (and how many) LDD modules to use?


Post Number:#1 Post Tue Mar 03, 2015 5:00 pm
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Hi everybody,

I do have a DIY LED lighting system, which uses the following units:
White LEDs => 10W, 9-12V, 1000mA LEDs,
Blue LEDs => 10W, 10-11V, 1000mA LEDs,

I'm planning to dimm those lights by using my arduino build, by adding LDD Meanwell boards composed by:

Boards: http://www.ebay.com/itm/1piece-5UP-Ldd- ... 3cec1b0d69
Drivers: http://www.ebay.com/itm/5pcs-meanwell-l ... 3ce30ac47b

I'd first set the power supply to 11V output just because of the blue LEDs, of course...

Above hardware's choice is the correct one?
How many LEDs could I hook to each LDD driver/module?

Any particular advice about wirying diagramm?

Thanks in advance your feedback
B'rgds,
Sergio

Post Number:#2 Post Tue Mar 03, 2015 7:18 pm
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Hi!

Welcome Sérgio!

Firstly, how many LEDs you will use?

The LEDs will be in parallel or serie?

Have you checked this topic? With $20 is possible buy 10 PCBs. :)

Best regards.
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Post Number:#3 Post Tue Mar 03, 2015 8:24 pm
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Hi Fernando, thanks for your welcome & below's reply.

My LEDs are in paralel, feeded by (2 different circuits) 1 x Power Supply offering 12v @ 29A (PWM Ready) and 1 x Computer's PS offering 15A.

I do have 4 alumminum bars with 8 x 10W LEDs each one.

Yes, I've red the topic you've told me, and this is a very interesting option for the boards!

Wait your advice for how many LDDs and how ro manage the voltage (or they'll have the same output as the input?)

Thanks!
Sergio

Post Number:#4 Post Tue Mar 03, 2015 9:20 pm
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LEDs in parallel isn't good idea.
Is needed 1 LDD to each LED because the maximum current is 1000 mA.
Is better use a power supply of 48V with 4 LEDs in serie. On this case is needed 8 LDD only.
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Post Number:#5 Post Wed Mar 04, 2015 12:55 am
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LEDs in parallel isn't good idea.
Is needed 1 LDD to each LED because the maximum current is 1000 mA.


OK, I see...

Is better use a power supply of 48V with 4 LEDs in serie. On this case is needed 8 LDD only.


Then I'd need 8 Power supplies @ 48V each (rated "4A" each one) + 8 LDDs?
The PSs should be like this one => http://www.ebay.com/itm/AC110-220V-to-D ... 1c4d498740 ? The investment will be somehow huge just with the PSs...

This mean that I will also use 8 Arduino Pins, or I could be consolidating/gouping 2 LDDs on each Pin?

Sorry for so many questions...

Post Number:#6 Post Wed Mar 04, 2015 9:23 am
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Hi!

Only 1 power supply is enough for all LEDs.

For 8 series at 1A the total current is 8A because the drivers will be in parallel.

You can use 1 PWM pin to 2 or more channels if you want.

Best regards.
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Post Number:#7 Post Wed Mar 04, 2015 10:59 am
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Sorry Fernando, I don't catch the idea...

For 8 series at 1A the total current is 8A because the drivers will be in parallel.


If I do have 8 series of 4 x 12V LEDs each (running @ 1000mA each), then I should need 384V and 32A for lighting the 32 LEDs with just one PS, isn't it?
However, if I do have 48V PS, and running the LEDs in series, I could only run 4 x 12V LEDs for each PS... that's my doubt.

B'rgds

Post Number:#8 Post Wed Mar 04, 2015 7:11 pm
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OMG!

Not at all!

When the LEDs are in parallel the current increase and voltage stays the same.

When the LEDs are in serie the voltage increase and current stays the same.

In others words for 4 LEDs in serie the voltage is 48V and current is 1A.

As you have 8 series in parallel the voltage is 48V and current 8A.

Also is needed 3V for LDD so, adjust the power supply to 51V if each LED is working at 12V.
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