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Related Experiment Video

Updated: Jun 3, 2026

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes

Operation of Laboratory Photobioreactors with Online Growth Measurements and Customizable Light Regimes

Published on: October 28, 2021

Automatic diagnosis and control of distributed solid state lighting systems.

Jianfei Dong¹, Willem van Driel, Guoqi Zhang

¹Delft University of Technology, Delft, the Netherlands. j.dong@tudelft.nl

|April 1, 2011

Summary

This study introduces an automated method to detect and fix LED failures in solid-state lighting (SSL) systems. The system uses unique frequencies for each LED to diagnose issues and reconfigure controls, ensuring uniform illumination.

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Area of Science:

Electrical Engineering
Optoelectronics
Illumination Systems

Background:

LED degradations in distributed solid-state lighting (SSL) systems reduce illumination levels and uniformity.
Existing literature lacks automatic schemes for diagnosing and compensating LED degradations.

Purpose of the Study:

To propose a novel design concept for automatically diagnosing and compensating LED degradations in distributed SSL systems.
To address the challenge of poor observability in diagnosing LED failures due to unmeasured individual LED outputs.

Main Methods:

Utilizing pulse width modulated (PWM) drive currents with unique fundamental frequencies for each LED.
Applying signal processing techniques to estimate individual LED illumination flux.
Developing statistical tests for diagnosing LED degradation.

Main Results:

Successfully estimated individual LED illumination flux.
Developed statistical tests to accurately diagnose LED degradation.
Demonstrated re-optimization of drive current duty cycles to compensate for failed LEDs.

Conclusions:

The proposed system effectively diagnoses and compensates for LED degradations in distributed SSL systems.
The novel approach using unique PWM frequencies enhances observability for fault detection.
The method ensures the restoration of uniform illumination distribution despite LED failures.