Pseudorandom pulse code modulation of LEDs

Ion Toma; Bojana Bjeljac; Ian Ashdown

doi:10.1117/12.732531

14 September 2007 Pseudorandom pulse code modulation of LEDs

Ion Toma, Bojana Bjeljac, Ian Ashdown

Proceedings Volume 6669, Seventh International Conference on Solid State Lighting; 666918 (2007) https://doi.org/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.

Citation Download Citation

Ion Toma, Bojana Bjeljac, and Ian Ashdown "Pseudorandom pulse code modulation of LEDs", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666918 (14 September 2007); https://doi.org/10.1117/12.732531

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