LED Lighting Device with Sensor-Based Current Control
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Solution Overview
Problem
Conventional lighting technologies, such as incandescent and fluorescent lights, are inefficient and have short lifespans, while solid state light emitters like LEDs face challenges in maintaining consistent color output due to intensity variations over time and temperature changes, necessitating innovative solutions for energy efficiency, color rendering, and prolonged service life.
Innovation Solution
A lighting device comprising at least two groups of solid state light emitters with a sensor to adjust current based on the intensity of combined light, ensuring consistent color output by using circuitry to compensate for variations in emission intensity and ambient temperature, thereby maintaining color consistency and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solid state light emitters are used to improve energy efficiency and lifespan, then energy consumption is reduced and service life is extended, but color consistency deteriorates due to intensity variations over time and temperature
Solution Approach 1:
The patent employs sensors to detect the intensity of combined light from multiple solid state light emitter groups and uses circuitry to adjust current applied to individual groups based on detected intensity. This feedback mechanism compensates for variations in emission intensity over time and temperature, maintaining consistent color output while preserving the energy efficiency benefits of solid state lighting.
Solution Approach 2:
The patent divides solid state light emitters into multiple groups that can be independently controlled with different currents. This dynamic control allows the system to adapt to temperature changes and aging effects by adjusting the relative contribution of each group, thereby maintaining color consistency without sacrificing the low energy consumption characteristics.
2Illumination intensity
If multiple solid state light emitters are used to improve color rendering, then color quality is enhanced, but device complexity increases due to need for multiple groups and control circuitry
Solution Approach 1:
The patent segments solid state light emitters into multiple groups, where each group contains emitters of different types (e.g., different wavelengths or colors). This segmentation enables improved color rendering by combining light from multiple groups while allowing independent current control to maintain color consistency, managing complexity through modular organization.
Solution Approach 2:
The patent uses a single sensor and control circuitry system that serves multiple functions: detecting intensity from multiple light emitter groups, processing the combined signal, and adjusting currents to multiple groups simultaneously. This multi-functionality enhances color rendering quality without proportionally increasing device complexity.
3Illumination intensity
If current is increased to maintain brightness as LEDs age, then illumination intensity is maintained, but energy consumption increases and lifespan is reduced
Solution Approach 1:
The patent uses sensors to continuously monitor the intensity of light from solid state light emitter groups and feeds this information back to the control circuitry. This enables the system to detect when emitters are aging and their output is declining, allowing for intelligent current adjustment that maintains brightness while minimizing energy consumption and avoiding excessive stress that would reduce lifespan.
Solution Approach 2:
The patent dynamically changes the current parameter applied to different groups of solid state light emitters based on detected intensity levels. By adjusting current levels optimally for each group based on their individual performance and aging characteristics, the system maintains overall brightness while managing energy consumption and extending the operational life of the light emitters.
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 solution provides a lighting device with stable and consistent color output, improved energy efficiency, and extended service life by dynamically adjusting current to counteract intensity and temperature-related changes in LED emission.
Implementation Method 1
A lighting device is provided which includes at least first and second groups of solid state light emitters... the first group solid state light emitters when illuminated emit light of a first wavelength... the second group solid state light emitters when illuminated emit light of a second wavelength
Implementation Method 2
at least a first sensor, the first sensor being positioned such that if the first group of solid state light emitters and the second group of solid state light emitters are illuminated, the first sensor will be exposed to combined light
Data Source
AI summary
A lighting device comprises groups of solid state light emitters, a sensor and circuitry. If the emitters are illuminated, the sensor is exposed to combined light from the groups, and senses only a portion of the combined light. The circuitry adjusts current applied to at least one of the emitters based on an intensity of the light sensed. Also, a device comprising emitters, a circuit board and a sensor, at least one of the emitters being positioned on the first circuit board and the sensor being spaced from the circuit board. Also, a lighting device comprising emitters, a sensor, and circuitry which adjusts current applied an emitters based on detection by the first sensor, the circuitry comprising a differential amplifier circuit. Also, a lighting device, comprising light emitters and circuitry which adjusts current applied to only some of the emitters based on ambient temperature. Also, methods of lighting.