Lighting Device Brightness Attenuation Detection
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Solution Overview
Problem
Existing lighting devices face challenges in accurately distinguishing between thermal and optical attenuation of brightness, often requiring additional temperature sensors, which increase costs.
Innovation Solution
A lighting device comprising a light source, a driving module, a sensing module, and a control module that adjusts the current to the light source and compares brightness values before and after the current increase to determine if the attenuation is due to thermal or optical causes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an additional temperature sensor is used to sense the temperature of the light fixture, then the accuracy of determining thermal attenuation is improved, but the cost of the lighting device increases
Solution Approach 1:
The patent extracts the temperature sensing function from a separate temperature sensor and integrates it into the existing brightness detection system. By using the brightness detection module to indirectly sense temperature effects through brightness changes, the system eliminates the need for additional temperature sensing hardware while maintaining detection accuracy.
Solution Approach 2:
The brightness detection module is given multiple functions: it detects both optical attenuation (direct brightness measurement) and thermal attenuation (indirect temperature sensing through brightness changes). This multi-functionality allows the same module to replace what would traditionally require separate temperature and optical sensors.
2Measurement precision
If a current increase test is performed to distinguish thermal from optical attenuation, then the accuracy of attenuation type determination is improved, but the energy consumption increases
Solution Approach 1:
The patent implements periodic current increase tests rather than continuous high-current operation. The system performs brief test cycles where current is increased to drive the light source, measures brightness changes, then returns to normal operation. This periodic approach maintains detection accuracy while limiting energy consumption to only when necessary for measurement.
Solution Approach 2:
The system applies partial excessive action by temporarily increasing current beyond normal operating levels only during brief test periods. This excessive current is applied just enough to generate measurable brightness changes for detection, then immediately reduced to normal levels, balancing the need for accurate measurement with energy conservation.
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
Accurately differentiates between thermal and optical attenuation states, reducing misjudgment and potentially lowering costs by eliminating the need for additional temperature sensors.
Implementation Method 1
a light source (12), a driving module (14), a sensing module (16), and a control module (18). The light source (12) is configured to emit light to illuminate an environmental scene
Implementation Method 2
The sensing module (16) is configured to obtain a brightness value corresponding to the environmental scene
Data Source
AI summary
A lighting device includes a light source, a driving module, a sensing module, and a control module. The driving module is configured to drive the light source. The sensing module is configured to obtain a brightness value corresponding to the environmental scene. The control module is configured to control the driving module to use a first current to drive the light source, control the sensing module to obtain a first brightness value, control, when the first brightness value is less than a reference brightness value, the driving module to use a second current to drive the light source, control the sensing module to obtain a second brightness value, the second current being greater than the first current by a predetermined amplitude value, compare the second brightness value with the first brightness value, determine that the light source is in a thermal attenuation state or an optical attenuation state.