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,
power factor
Nov 02, 2007
4 Replies
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.
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LED can be fed with VAC, of course it's blinking then. What's the LED's power factor supplied from VAC?
Marcin,
No, if you bias LEDs the wrong way, they blow up. Blinking LEDs are fed with an interrupted dc supply.
Ordinary diode connected in parallel but the opposite way round. When the voltage reverses the diode conducts and protects the LED.
However, blinking at mains frequency probably isn't too noticeable
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