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100 Watt led driver question

Discussion in 'LEDs and Optoelectronics' started by Gregted, Sep 21, 2016.

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  1. Gregted

    Gregted

    1
    0
    Sep 21, 2016
    G'day all.

    I bought some 100 watt leds and a driver board to suit. I must say these are awesome. It is capable of 3.5 amps but I am running it at 1 amp as I can't seem to find anything about a safe operating temp, so only 30 odd watts but still amazing amount of light.

    The only thing I want to do is run a potentiometer in series with either the amp or voltage adjustment pot to allow me to turn the light up or down once the max amps or voltage is set.

    I have attached some pics of the boost converter with the blue trim pots visible.

    I have also attached a pic of the basic circuit for led adjustment and how I have tried to set max current and have brightness adjustment but this doesn't work.

    It's probably a common circuit but I can't get my head around it.

    Any help appreciated.

    Greg
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,553
    2,353
    Nov 17, 2011
    Theoretically possible, but the high power pots required are hard to find, expensive and will cause a lot of uselessly dissipated power (unless you plan to heat your appartment during cold nights :D).
    The LED driver you show has integrated pots (trom pots) for setting the current (cc-sdj) plus another one where the label is not readable. I suggest you replace the cc-adj pot by an external pot of the same value so you can adjust the current and therewith brightness using this external pot. As the driver is obviously a switch mode driver, this external pot will vary the ducty cycle (pulse/period ratio) of the LED current, thus avoiding unnecessary power loss.
     
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