to amplify the current to 1 amp

Discussion in 'The Projects Forum' started by kaznov, Feb 25, 2013.

  1. kaznov

    Thread Starter Member

    Mar 10, 2012
    30
    0
    Hi guys am designing a brightness control system using adruino board with atmega328 to light up 4 led lights each is 110 vac for indoor room, the problem that am facing difficulty figuring out what to use from the pwm output pin of the adruino chip to generate high current to power up the LED light which are 110 vac for my project

    all help is appreciated
    thanks
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,364
    Don't think you are going to get 110VAC from your arduino.
     
  3. DickCappels

    Moderator

    Aug 21, 2008
    2,659
    632
    If you are using complete LED lamps that operate directly from AC, your best bet is to use a transformer to sense the phase of the AC line, then based on that timing, fire a triac at the proper phase. To do you, your LED lamps must be rated for dimmer operation (some don't work well on dimmers).

    If you are using bare LEDs, you can find LED driver chips from companies like Power Integrations, Texas Instruments, and International Rectifier (to name but a few) that have dimmer inputs -usually analog. You can drive the dimming input by low pass filtering and buffering the output of your PWM.
     
  4. kaznov

    Thread Starter Member

    Mar 10, 2012
    30
    0
    Thank you DickCappels for the clear detailed answer
     
  5. tindel

    Active Member

    Sep 16, 2012
    568
    193
    Couldn't you just use a solid state relay and PWM controller to turn on/off the LED's with the arduino?
     
  6. DickCappels

    Moderator

    Aug 21, 2008
    2,659
    632
    It seems unlikely that a solid state relay would be fast enough to able to respond PWM from an AVR (Adurino). We're taking many tens of kHz or faster.
     
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