14 September 2007 Pseudorandom pulse code modulation of LEDs
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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