Share Email Print
cover

Proceedings Paper

Pseudorandom pulse code modulation of LEDs
Author(s): Ion Toma; Bojana Bjeljac; Ian Ashdown
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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)

© SPIE. Terms of Use
Back to Top