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

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