LED Fixture Single Sensor Aggregate Parameter Control
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Solution Overview
Problem
The complexity and cost of hardware increase significantly when multiple groups of LEDs with different characteristics require separate sensing circuits for parameters like light output, forward voltage, and temperature, leading to increased complexity and reduced accuracy due to cross-talk between sensors.
Innovation Solution
A single sensing device measures the total operative parameter of multiple LED groups operated simultaneously, allowing the control circuit to derive individual group parameters, reducing hardware requirements and minimizing disruption to normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensing circuits are provided for each group of LEDs, then measurement precision of individual group parameters is improved, but device complexity and hardware cost increase significantly
Solution Approach 1:
The patent merges multiple separate sensing circuits into a single sensing device that measures the aggregate operative parameter of all LED groups. The control circuit then mathematically derives individual group parameters from these aggregate measurements, eliminating the need for multiple physical sensors and reducing hardware complexity while maintaining measurement capability.
Solution Approach 2:
The single sensing device is designed to measure the total operative parameter across all LED groups simultaneously, making it a universal measuring instrument. This multi-functional approach allows one device to perform the role of multiple specialized sensors, reducing overall system complexity.
2Measurement precision
If separate sensing circuits are provided for each group of LEDs, then individual group parameter measurement is improved, but hardware cost increases
Solution Approach 1:
Multiple expensive individual sensors are merged into a single sensing device that measures aggregate parameters. The control circuit processes these measurements to derive individual group data, significantly reducing hardware costs while maintaining the ability to control each LED group independently.
3Measurement precision
If multiple separate sensors are used, then individual LED group monitoring accuracy is improved, but cross-talk between sensors increases causing reduced accuracy
Solution Approach 1:
The patent eliminates cross-talk errors by merging multiple separate sensors into a single sensing device. Since there is only one sensor measuring the aggregate output, there are no adjacent sensors to interfere with each other, completely removing the cross-talk problem while still enabling individual group control through mathematical derivation.
4Measurement precision
If moments in time are obtained by de-activating and activating LED groups, then operative parameter measurement is enabled, but disruption to normal operation increases
Solution Approach 1:
The control circuit implements periodic measurement cycles where LED groups are temporarily activated or deactivated in a repeating pattern. This periodic action allows the single sensing device to measure aggregate parameters at different time points, enabling derivation of individual group characteristics while minimizing disruption through systematic timing.
Solution Approach 2:
The control circuit plans and coordinates the activation/deactivation sequences in advance, determining optimal measurement moments before they occur. This preliminary planning ensures that measurements are taken at the most appropriate times with minimal disruption to overall LED operation.
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
This approach simplifies the control of LED groups, reduces hardware costs, minimizes cross-talk errors, and allows for more stable and accurate light output control with reduced flicker impact, while maintaining normal operation and enabling higher frequency feedback loops.
Implementation Method 1
a light sensor arranged to receive part of the monochrome light output of the plurality of LEDs
Implementation Method 2
a cover provided with a coating or coatings of phosphor or phosphorous materials arranged to receive at least part of the monochrome light output and to emit light having a different frequency or frequency spectrum
Data Source
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AI summary
An LED fixture is described, the LED fixture comprising: -a plurality of LEDs, in use providing a light output; -a cover being provided with a plurality of different coatings of phosphor or phosphorous materials, each coating being arranged to substantially receive the light output of a subset of the plurality of LEDs; - a light sensor arranged below the cover and arranged to receive part of the light output of the plurality of LEDs.