LED Lighting Driver Feedback Control for Wide Output Voltage Range
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Solution Overview
Problem
Existing lighting control devices have a fixed output voltage range, making them incompatible with LED lighting of varying rated powers, especially after efficiency upgrades that reduce the required voltage.
Innovation Solution
A lighting control device with a wide output voltage range, featuring a driver that adjusts output power based on feedback pin voltage comparison, a feedback voltage output unit that generates a voltage unrelated to output power, and a dimming controller for brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a converter has a fixed output voltage range, then the converter can be designed and installed in advance to match the rated power, but the converter cannot control LED lighting with various rated powers after efficiency upgrades
Solution Approach 1:
The patent implements dynamic output voltage adjustment by comparing feedback voltage with reference voltages and dynamically selecting appropriate reference voltages based on the lamp module's characteristics. This allows the converter to adapt its output voltage range from 21V to 30V dynamically, resolving the contradiction between fixed design stability and adaptability to various rated powers.
Solution Approach 2:
The patent changes the operating parameters of the converter by introducing multiple reference voltages (first reference voltage for 21-25V range, second reference voltage for 26-30V range) and dynamically switching between them based on feedback voltage levels. This parameter change approach enables the converter to accommodate LED lighting with different rated powers while maintaining reliable operation.
2Loss of energy
If LED lighting efficiency increases, then the rated power decreases for maintaining the same brightness, but the LED lighting cannot be operated by the conventional converter
Solution Approach 1:
The patent enables dynamic adaptation to高效率 LED lighting by continuously monitoring feedback voltage and adjusting the reference voltage selection accordingly. When high-efficiency LED modules with lower rated power are connected, the feedback voltage falls into different ranges, triggering the selection of appropriate reference voltages that match the reduced power requirements, thus maintaining compatibility.
Solution Approach 2:
The patent uses feedback voltage from the lamp module to determine the appropriate reference voltage for comparison. This feedback mechanism allows the converter to automatically detect the connected LED lighting's power requirements and adjust its output characteristics accordingly, enabling seamless operation with both conventional and high-efficiency LED modules.
3Reliability
If separate converters are used for different rated voltages, then each converter can be optimized for its specific voltage range, but inventory management becomes complex
Solution Approach 1:
The patent implements a universal converter design that can handle multiple voltage ranges (21V-30V) within a single device by incorporating multiple reference voltages and a dynamic selection mechanism. This multi-functionality eliminates the need for separate converters for different voltage ranges, simplifying inventory management while maintaining optimized performance across all voltage levels.
Solution Approach 2:
The patent segments the voltage range into two sub-ranges (21-25V and 26-30V) with dedicated reference voltages for each segment. This segmentation allows the converter to maintain optimized control for each voltage range while using a single unified device, combining the benefits of specialized converters with the simplicity of a universal design.
Data Source
AI summary
Disclosed is a lighting control device. The lighting control device connected to a lamp module and configured to control light emission of the lamp module includes a driver configured to receive input power, output output power to the lamp module, and adjust a magnitude of the output power according to the result of comparison between a feedback pin voltage applied to a feedback pin and a threshold voltage, a feedback voltage output unit configured to output a feedback voltage unrelated to the output power to the feedback pin, and a dimming controller configured to receive a dimming level signal and output a dimming control signal for controlling the brightness of the lamp module to the feedback pin based on a target dimming level corresponding to the dimming level signal and a current dimming level corresponding to a current brightness of the lamp module.