LED driver for 30W RGB floodlight

Discussion in 'The Projects Forum' started by Robin Gerritsen, May 25, 2016.

  1. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    Hello,

    I am new in this type of electronic circuits.

    I want to make a wake-up light with Arduino.

    I have a power supply:
    Input AC 85-265V 50/60Hz 0,3Amps
    Output DC 24 - 36V 900mA +/-5%
    (See picture)

    I have a 30W RGB floodlight.
    The red needs 20-24V and green and blue 30-34V.
    How can I regulate the voltage output of the power supply? It says it is 24-36V but how can I regulate this?
    The specifications are in the picture.


    Coding I can do, but I don't know where to start with the circuit.
    I know I need to use the PWM output pins to control the light.

    I know I need MOSFETS to drive these lights, but like I said, I really don't know where to begin.

    Any suggestions for a circuit for this project?
     
  2. bushrat

    Member

    Nov 29, 2014
    97
    22
    Any particular pattern you need? (red for x time, green for x time, blue for x time)
    Are they all driven by one pin or does each color have separate pin?
    What is the pinout of the LED module? How many pins and what are they?..
     
  3. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    I want to control each color separately. So I can mix the colors.
    I want to know what I need to make this work.
     
  4. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    PWM with Arduino is simple, you only need to use analogWrite() 0-255 to make the colors.
     
  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,769
    969
    That LED driver (power supply) won't really work for your LED as the output current is fixed at 900mA and your LED needs 350mA..
    You would more than likely overheat the LED and destroy it..

    That is a constant current power supply that WILL supply 900mA (not up to 900mA) over a range of 24 to 36 VDC..
    Its not like a constant voltage power supply that will supply up to its rated current at a fixed output voltage..
    And an LED needs to be FED current and does not "take" only the current it needs like a resistor or lightbulb,etc..

    Its not capable of driving the red LED either if it cannot regulate properly below 24 volts.. It may just blink on/off as thats what many do when they are not used in their stated range..

    You need 3 LED drivers.. 1 for each color..

    I would suggest getting a 48V regular (constant voltage) power supply and 3 meanwell LDD-350h led drivers.
    The meanwell drivers also accept a 5V PWM signal right from the arduino for dimming.. (make sure the arduino ground is also common (attached to) the 48v power supply ground.
     
  6. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    And I need to limit the voltage after the led driver so the red does not get more then 24V and green and blue not more then 36V.
    Right?

    So what I need is a 48V regular power supply.
    And those 3x LDD-350h drivers.

    And connect it like it's displayed in the standard application in the data sheet? With each LED on one driver
     
  7. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    And I need to connect the ground of the Arduino to the - of the powersupply. So I can just power my Arduino with 12V input from another source. And the - of this supply connects to the - of the 48V powersupply? so they all have the same ground?

    I was confused because the AC has an L-, N- and a GND-Cable so I didn't know which ground you meant.
    But now I think I understand.
     
  8. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    So this 48V power supply is fine?
    It's 48V 1Amp. And the 3 drivers are using 320Amps each by full power.
    By 24/7 use it's recommended to use 80% of it's maximum. But since the light is not always on, it's not a problem right?
     
  9. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    Sorry for the many posts, but I found a powersupply from Meanwell which os 48V 35W but it's 0.8Amps and the drivers are 320mA each (max).
    Is this powersupply good enough?
    Or do I need a 50W powersupply
    I can choose from RS-35(W)-48(V) or RS-50-48 which is 1.1Amps.

    And do I need to limit the voltage after the driver to protect the leds?
    Red needs 22-24V
    Green needs 30-34V
    Blue needs 30-34V
    How am I supposed to do this?
     
  10. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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  11. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
    Thanks you so much!
    I am going to order the LLDs and the powersupply!
     
  12. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
    1
  13. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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  14. Robin Gerritsen

    Thread Starter New Member

    May 25, 2016
    17
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    Yeah! I got it working!
    But I get another LED from miniinthebox because the green LED doesn't work.

    Now I can start programming :-D
     
  15. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Great job..
    be careful to NEVER look directly at the light.. Eye damage can happen in seconds with high power LEDs..
     
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