Variable DC Power for Jeep

Discussion in 'The Projects Forum' started by LED4LYF, Aug 26, 2010.

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  1. LED4LYF

    Thread Starter New Member

    Aug 26, 2010
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    Hi everyone
    I am a total noob so please bear with me. I am in the middle of makeing a light bar for my jeep and I am using some high power leds (SST-50).These will be wired in series. The specs of the leds are MaxVf 3.6v and 5A max. I am in need of a power supply that can use my car battery as a source voltage(12-14vdc) and output needs to be adjuatable from 0-15v(what ever my Vf of led string is, 3.6v x 4 leds=14.4v) and 4 to 5A fixed. Is there any way this can be done? I am no stranger to using solder, heatsinks and all that good stuff I just need help in the design. Any help would be appreciated.
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
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    If you're wanting to vary the brightness of the LEDs I'd keep the voltage at full and feed them with a variable duty cycle pulse. LEDs don't exactly dim like light bulbs do. From 0V you have a long period of nothing followed by a minimal amount of adjustment as the amount of current is varied through them while they're conducting.
     
  3. LED4LYF

    Thread Starter New Member

    Aug 26, 2010
    10
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    No I do not want to vary the brightness of them so I guess I need a fixed input voltage 12v (engine not running)(close to 14v egnine running). And a fixed 5A output and Vout needs to be my Vf of leds.
     
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
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  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Oops - this is a topic that is no longer open for discussion on the forums.

    Please see the "Automotive Guidelines" in the General Electronic Discussions forum.

    Vehicle exterior lighting is one of the prohibited topics.
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    SgtWookie is right.
    Vehicle exterior lighting is one of the prohibited topics.
    It is a safety matter.

    Bertus
     
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