PWM

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Hi freaks,

My question isn't really related to an AVR but I'll ask it anyway.

Some time ago I came across a thread with alternate PWM methods but can't find it anymore.

Do any of you know alternate PWM methods for controlling LED's which are more efficient regarding the heat production in the LED?

I think there is a method with a patent, but I don't know the name.

Thanks in advance

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You might be able to temper the edge of the pulse with a ramp or something, but I don't know how much effect it would have on the LED. If you do much more than that, I don't know if it could be called PWM anymore.

Regards,
Steve A.

The Board helps those that help themselves.

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The RMS value of a 25%, 50% and 99% duty 5V square wave is .25, .5 and .99 x 5V.... EXACTLY the same power in the led as if an adjustable power supply of that exact voltage was used. Now if you used a linear adjustable regulator like an LM317 to run the led instead of pwm... then the regulator would get a little warm. Is this what you meant?

Imagecraft compiler user

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u can connect from PWM Pin to Led anh u see...
okie

Dear.
Cybernetics 45...

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I found them again BAM and frequecy modulated PWM.
The objective is to make sure not all the leds are swiched on simultaneously to ruduce the high peak load on the PSU.