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Proceedings Paper

Pseudorandom pulse code modulation of LEDs
Author(s): Ion Toma; Bojana Bjeljac; Ian Ashdown
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Paper 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.

Paper Details

Date Published: 14 September 2007
PDF: 6 pages
Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 666918 (14 September 2007); doi: 10.1117/12.732531
Show Author Affiliations
Ion Toma, Philips Lighting (Canada)
Bojana Bjeljac, Philips Lighting (Canada)
Ian Ashdown, Philips Lighting (Canada)

Published in SPIE Proceedings Vol. 6669:
Seventh International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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