14 September 2007 Pseudorandom pulse code modulation of LEDs
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Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 666918 (2007); doi: 10.1117/12.732531
Event: Optical Engineering + Applications, 2007, San Diego, California, United States
Abstract
We introduce an alternative to pulse width modulation (PWM) for LED intensity control called "Pseudorandom Pulse Code Modulation." Rather than using a single pulse with a variable duty factor to control the time-averaged LED drive current, we generate a pseudorandom pulse code to perform the same function. The advantages of this technique include: 1) the ability to control multiple channels without the need for dedicated PWM hardware circuitry; 2) drive current averaging; and 3) reduction of acoustic noise due to magnetostriction.
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Ion Toma, Bojana Bjeljac, Ian Ashdown, "Pseudorandom pulse code modulation of LEDs", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666918 (14 September 2007); doi: 10.1117/12.732531; https://doi.org/10.1117/12.732531
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KEYWORDS
Light emitting diodes

Modulation

Acoustics

Magnetostrictive materials

Microcontrollers

Power supplies

Clocks

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