Dimmable LED Lamp Efficiency Control via Photo Sensor
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Solution Overview
Problem
Lamps are not operated optimally in terms of efficiency, as the efficiency of light emission to power supplied ratio is influenced by temperature and not maximized at maximum output, leading to suboptimal light emission.
Innovation Solution
A method and system to determine efficiency values at different dimming levels, using a photo sensor to record brightness and a control device to automate the process, ensuring the lamp operates at the dimming level that maximizes efficiency, with temperature equilibrium consideration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the lamp is operated at maximum output, then the power supplied is maximized, but the efficiency of light emission to power supplied ratio is not maximized due to temperature effects
Solution Approach 1:
The patent applies parameter changes by systematically varying the dimming level parameter to identify the optimal operating point. The control device adjusts the dimming level through predefined steps, measuring efficiency at each level to determine which parameter setting maximizes the efficiency ratio. This resolves the contradiction by finding a specific power level that optimizes efficiency rather than simply operating at maximum power.
2Loss of time
If efficiency measurements are taken immediately after setting dimming levels, then the measurement process is faster, but the temperature has not reached equilibrium leading to inaccurate efficiency values
Solution Approach 1:
The patent applies preliminary action by implementing a waiting period before efficiency measurements are taken. The control device is configured to delay the efficiency measurement until a predetermined time has elapsed after setting each dimming level, allowing the temperature to reach equilibrium. This preliminary waiting action ensures accurate measurements without significantly extending the total measurement process time.
3Use of energy by moving object
If multiple dimming levels are tested to find the most efficient operating point, then the efficiency is maximized, but the complexity of the operation increases
Solution Approach 1:
The patent applies self-service by implementing an automated measurement and evaluation process. The control device automatically cycles through multiple dimming levels, performs efficiency measurements at each level, compares the results, and identifies the optimal operating point without requiring manual intervention. This automation resolves the contradiction by making the complex multi-level testing process as simple as initiating a single command.
4Ease of operation
If automated control is implemented to determine efficiency values at different dimming levels, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the control device to perform multiple functions within a single integrated unit. The control device not only adjusts dimming levels but also measures efficiency values, compares results, determines optimal operating points, and controls the timing of measurements. This multi-functionality resolves the contradiction by consolidating what would otherwise require multiple separate devices into one unified system.
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
Enables particularly efficient light emission by identifying and operating at the dimming level with the highest efficiency value, enhancing energy usage and operational simplicity.
Implementation Method 1
A photo sensor 3 can be used for this purpose, for example. The detection of the brightness values can be carried out particularly precisely if the relative positioning between the lamp 2 and the photo sensor 3 is kept unchanged while carrying out step (a).
Data Source
Figure 1
AI summary
The method involves automatically determining performance values of a lamp (2) by a control device (4) during different dim-levels, where the lamp is provided with a light source e.g. LED. Intensity values of light radiation (7) output from the lamp are detected by a photo sensor (3) to determine the performance values of the lamp. Time-dependent temperature measurement is performed in a region of the lamp using a temperature device for determining waiting period. The control device is connected with an electronic ballast (5) over a bus (6). An independent claim is also included for a system for operating a dimmable lamp.