Multi-LED Lighting Apparatus with PWM Color Temperature Control
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Solution Overview
Problem
Current lighting solutions lack flexibility and cost-effectiveness in adjusting optical parameters such as color temperature, which limits user satisfaction and light quality.
Innovation Solution
A lighting apparatus comprising multiple LED modules with different color temperature profiles, a constant current generator, and a driver that uses PWM signals to adjust light intensity and color temperature, allowing for stable and comfortable light output adjustments through a combination of LED modules and manual or remote control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED modules with different color temperature profiles are used, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The lighting system is divided into multiple LED modules, each emitting light with a different color temperature profile (first, second, and third profiles). This segmentation allows independent control of each module to achieve various mixed color temperatures, resolving the contradiction by providing wide adaptability through modular design while keeping each individual module relatively simple.
Solution Approach 2:
The driver circuit is designed to universally control multiple LED modules with different color temperature profiles using PWM signals. This multi-functional driver can adjust the intensity of each LED module independently, enabling a single device to provide various color temperature outputs (warm, neutral, cold white) without requiring separate control systems for each module.
2Ease of operation
If PWM signals are used to control LED intensity, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical dimming controls with electronic PWM (Pulse Width Modulation) control. The driver generates PWM signals to control the intensity of each LED module electronically, providing smooth and precise light intensity adjustment without mechanical moving parts. This substitution improves ease of operation while the integrated driver design keeps the overall system complexity manageable.
3Ease of manufacture
If multiple LED modules are controlled by a single constant current generator, then cost is reduced, but reliability may worsen
Solution Approach 1:
The patent merges multiple LED modules into a single circuit architecture controlled by one constant current generator. The driver intelligently distributes the constant current to different LED modules based on PWM control signals, allowing cost-effective manufacturing through component reduction while maintaining system reliability through electronic current management and protection circuits.
Solution Approach 2:
The system changes the current distribution parameters dynamically using PWM control. The constant current generator maintains a stable overall current while the driver adjusts the proportion of current allocated to each LED module. This parameter control approach allows cost-effective single-generator design while ensuring reliable operation through precise electronic current management.
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 flexible and stable adjustment of light output, providing a warmer or colder color temperature as needed, while maintaining high reliability and low costs, by mixing light outputs from multiple LED modules and controlling their intensities.
Implementation Method 1
The first LED module emits light with a first color temperature profile. The second LED module emits light with a second color temperature profile. The third LED module emits light with a third color temperature profile.
Implementation Method 2
a driver that uses PWM signals to adjust light intensity and color temperature
Data Source
AI summary
A lighting apparatus includes a first LED module, a second LED module, a third LED module, a constant current generator, a first switch, a third switch and a driver. The constant current generator is used for generating a constant current according to a major PWM signal. The first LED module and the third LED module are connected in parallel and share the constant current. The constant current is adjusted by changing a major duty ratio of the major PWM signal. The driver is used for generating the major PWM signal, a first PWM signal and a third PWM signal. The first color temperature profile, the second color temperature profile and the third color temperature profile have different spectrum distributions.