Selectable LED Control for Color Temperature and Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lighting control systems, particularly those using phase-cut dimmers, are inadequate for efficiently adjusting the color temperature and brightness of LED lamps, as they do not offer the same level of control and flexibility as incandescent lamps, and existing LED control technologies lack the ability to seamlessly integrate with traditional dimming systems.
Innovation Solution
A selectable adjustable control system for LED lamps that includes a microcontroller and LED driver, allowing for the combination of LEDs with different correlated color temperatures (CCT) to produce a combined white light with adjustable brightness, using a user-adjustable DC input voltage and a plurality of CCT selection values, and can operate in various modes including constant power/color temperature, power variation, and CCT variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase-cut dimmers are used to adjust LED brightness, then compatibility with traditional dimming systems is improved, but control precision over color temperature is worsened
Solution Approach 1:
The patent segments the LED system into multiple independent LED channels, each with different correlated color temperatures (CCT). By controlling the intensity of each channel separately through PWM dimming, the system achieves precise CCT control while maintaining compatibility with traditional phase-cut dimmers at the input stage.
Solution Approach 2:
The system dynamically adjusts the intensity of each LED channel based on user input and desired CCT targets. The controller continuously modifies the PWM duty cycles of individual LED channels to achieve the target color temperature and brightness levels, enabling dynamic and precise color temperature control.
2Adaptability or versatility
If multiple LEDs with different CCTs are combined to achieve adjustable color temperature, then control flexibility is improved, but device complexity is worsened
Solution Approach 1:
The patent combines multiple LEDs with different correlated color temperatures into a single integrated lighting module. By merging these different CCT LEDs and controlling them through a unified PWM dimming system, the patent achieves adjustable color temperature output while managing device complexity through integrated control architecture.
Solution Approach 2:
The system uses universal PWM dimming control that can simultaneously manage multiple LED channels with different CCTs. This multi-functional approach allows a single control system to handle both brightness adjustment and color temperature regulation, reducing the need for separate control circuits for each function.
3Measurement precision
If PWM dimming is used for precise LED control, then control precision is improved, but compatibility with existing dimming systems is worsened
Solution Approach 1:
The patent introduces an intermediary control stage that converts traditional phase-cut dimmer input signals into PWM control signals for the individual LED channels. This intermediary conversion layer maintains compatibility with existing dimming systems while enabling precise PWM-based control of multiple LED channels with different CCTs.
Solution Approach 2:
The system replaces the direct electrical connection between traditional dimmers and LEDs with an electronic conversion stage that translates phase-cut signals into PWM signals. This substitution allows the system to maintain compatibility with mechanical/electrical dimming infrastructure while utilizing modern electronic PWM control for precise LED channel 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 precise control over color temperature and brightness of LED lamps, ensuring compatibility with existing dimming systems and providing users with flexible lighting options, enhancing energy efficiency and usability.
Implementation Method 1
a first LED (light emitting diode) that is configured to emit a first white light of a first correlated color temperature (CCT); a second LED that is configured to emit a second white light of a second CCT
Implementation Method 2
for the first white light to mix with the second white light to yield a combined white light having a combined-light CCT with a combined-light brightness
Implementation Method 3
receive a user-adjustable DC input voltage Vin from a selectable control device, wherein the selectable control device comprises a plurality of CCT selection values; and distribute supply power to the first LED and second LED
Data Source
AI summary
Disclosed embodiments provide techniques and devices for changing the color temperature and/or brightness of an LED lamp utilizing a selectable control device. The selectable control device may include one or more buttons, sliders, and/or rotary knobs. The buttons, sliders, and/or rotary knobs may be coupled to resistors, including variable resistors (potentiometers), that utilize resistance shunting. In embodiments, the shunt resistance varies under different dialing conditions (configuration of the selectable control device), so as to obtain different current ratios and achieve the purpose of mixing different color temperatures.