LED Optical Output Stabilization via Temperature Feedback Control
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Solution Overview
Problem
Solid state illumination systems, particularly those using LEDs, face challenges in maintaining consistent optical output due to temperature variations, which affect optical power and wavelength, complicating diagnostic applications like fluorescent microscopy that require precise and repeatable light sources.
Innovation Solution
A feedback system that characterizes the optical properties of LEDs and other optical elements as a function of temperature, using temperature sensors and controllable current sources to adjust electrical current, ensuring stable optical output across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED illumination systems are used in solid state illumination devices, then the system benefits from solid state reliability and efficiency, but the optical output becomes unstable due to temperature variations affecting optical power and wavelength
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the actual optical output of the LED illumination system and compares it to a desired target output. The controller automatically adjusts LED operating parameters (such as drive current) based on the feedback signal to compensate for temperature-induced variations, thereby maintaining stable optical output while preserving the reliability benefits of solid state LED technology
Solution Approach 2:
The patent changes the operating parameters of the LED (specifically drive current and wavelength) dynamically in response to temperature variations. By adjusting these parameters through the feedback controller, the system compensates for temperature effects on optical power and wavelength, maintaining consistent optical output despite temperature fluctuations
2Stability of the object's composition
If temperature compensation is implemented to maintain stable optical output, then optical stability improves, but system complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The patent uses a feedback control system that, while adding components, integrates them into a closed-loop architecture that automatically maintains optical stability. The feedback mechanism provides continuous monitoring and automatic correction, reducing the need for manual intervention and simplifying overall system operation despite the added complexity of temperature sensors and controllers
Solution Approach 2:
The system performs self-compensation for temperature effects through automatic feedback control. The controller autonomously adjusts LED operating parameters based on real-time temperature and optical output measurements, eliminating the need for external manual calibration or intervention and reducing operational complexity
3Stability of the object's composition
If real-time temperature monitoring and current adjustment are implemented, then optical power stability improves, but energy consumption increases due to additional active components
Solution Approach 1:
The feedback control system optimizes energy consumption by making adjustments only when necessary to maintain optical stability. The controller monitors temperature and optical output continuously but only activates current adjustment when deviations from the target output are detected, reducing unnecessary energy consumption while maintaining stable optical power
Solution Approach 2:
The system dynamically adjusts its level of active compensation based on actual operating conditions. When temperature is stable and optical output is within acceptable ranges, the system reduces adjustment frequency or amplitude, lowering energy consumption of the control system while maintaining optical power stability when needed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves ±1% power stability over a wide temperature range, providing consistent and repeatable optical energy for improved diagnostic accuracy and efficiency in molecular diagnostics.
Implementation Method 1
temperature sensors measure a temperature associated with each respective LED in the device
Implementation Method 2
electrical current to one or more of the LEDs can be adjusted based on the measured temperatures associated with each LED and its stored characterizing information
Implementation Method 3
multiple light emitting diodes (LEDs) configured to produce light at different wavelengths
Data Source
AI summary
A method is disclosed for maintaining a desired optical output in a solid state illumination device, where the device is configured to accommodate multiple light emitting diodes (LEDs) and to combine light from the LEDs to produce a single optical output. The method includes testing the LEDs before adding them into the device. The testing produces characterizing information that describes how one or more optical properties (e.g., optical power and/or peak wavelength) of the tested LED change with temperature. This characterizing information is stored in a computer-based memory of the device, and the tested LED is added (connected) into the device. Then, during operation, temperature sensors measure a temperature associated with each respective LED in the device, and electrical current to one or more of the LEDs can be adjusted based on the measured temperatures associated with each LED and its stored characterizing information.