LED Lighting Apparatus with PWM Current Ratio Control
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Solution Overview
Problem
Current lighting solutions lack flexibility in adjusting color temperature and light intensity, which is essential for various applications, and are not cost-effective.
Innovation Solution
A lighting apparatus comprising a bridge circuit, current source, and multiple LED modules with PWM signals and resistor modules that allow for adjustable resistance and duty ratios to generate mixed color temperatures and light intensities, enabling flexible control of lighting output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional lighting systems are used, then the structure is simple, but the flexibility in adjusting color temperature and light intensity is limited
Solution Approach 1:
The lighting system is segmented into multiple LED modules (first LED module, second LED module, third LED module) with different color temperatures, each controlled independently through separate PWM signals. This segmentation allows flexible adjustment of overall color temperature and intensity by controlling individual modules, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent implements dynamic control of LED modules through PWM (pulse-width modulation) signals with adjustable duty ratios. The duty ratios of first, second, and third PWM signals can be dynamically adjusted to change the driving current ratios supplied to different LED modules, enabling real-time adjustment of mixed light color temperature and intensity while maintaining a relatively simple circuit structure.
2Adaptability or versatility
If LED modules with different color temperatures are used, then the lighting flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent uses three LED modules with different color temperatures (first LED module with first color temperature, second LED module with second color temperature, third LED module with third color temperature) that can serve multiple lighting needs. By controlling the duty ratios of PWM signals supplied to these modules, a single lighting apparatus can provide various color temperatures and intensities, eliminating the need for multiple separate lighting devices and reducing overall system complexity.
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
The solution provides a cost-effective and flexible means to adjust both color temperature and light intensity, enhancing lighting quality and user satisfaction across different environments.
Implementation Method 1
The bridge circuit is used for rectifying an input AC power to generate a DC power
Implementation Method 2
The current source receives the DC power to generate a driving current
Implementation Method 3
The first LED module emits a first light of a first color temperature
Implementation Method 4
The first LED module emits a first light of a first color temperature
Implementation Method 5
The second LED module emits a second light of a second color temperature
Implementation Method 6
The second LED module emits a second light of a second color temperature
Implementation Method 7
The switch is coupled to the current source to change at least a resistance parameter corresponding to a current ratio between the first LED module and the second LED module
Data Source
AI summary
A lighting apparatus includes a bridge circuit, a current source, a first LED module, a second LED module and a switch. The bridge circuit is used for rectifying an input AC power to generate a DC power. The current source receives the DC power to generate a driving current. The first LED module emits a first light of a first color temperature. The second LED module emits a second light of a second color temperature. The switch is coupled to the current source to change at least a resistance parameter corresponding to a current ratio between the first LED module and the second LED module to generate a mixed light of a mixed color temperature.