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power factor

Discussion in 'Electrical Engineering' started by Marcin Bartnicki, Nov 2, 2007.

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  1. Hi.

    I need an information about LED's (Light Emitting Diode) power factor- cos
    (fi). I know that question is seemingly strange but I hope that someone
    could help me.



    Marcin,
     
  2. charles

    charles Guest

    LEDs are fed with a dc voltage. where there may be a power factor
    variation would be due to the power supply feeding the LED. That will
    depend on the design of the power supply.
     
  3. LED can be fed with VAC, of course it's blinking then.
    What's the LED's power factor supplied from VAC?

    Marcin,
     
  4. charles

    charles Guest


    No, if you bias LEDs the wrong way, they blow up. Blinking LEDs are fed
    with an interrupted dc supply.
     
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