LED Color Temperature Switching With Constant Light Intensity
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Solution Overview
Problem
Existing lighting control systems, particularly those using mechanical switches, pose safety concerns in environments prone to gas explosions and require manual operation, which can lead to contamination issues. Additionally, prior electronic switch solutions, such as those using infrared sensors, are complex or inefficient in power transmission control.
Innovation Solution
A microcontroller-based electronic switch system that incorporates controllable semiconductor switching elements and detection devices like infrared sensors or electrostatic induction sensors to provide contactless operation, enabling on/off switch control, dimming, and color temperature management by interpreting motion signals and adjusting power levels to the lighting loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical-type electric switch is used for on/off control, then manual operation is simple, but electric sparks may be generated causing safety hazards in gas-prone environments
Solution Approach 1:
The patent replaces the mechanical-type electric switch with a solid-state electronic switch using a triac (controllable semiconductor switching element). This substitution eliminates mechanical contacts that generate electric sparks, thereby improving safety in gas-prone environments while maintaining switching functionality through electronic control mechanisms.
2Reliability
If solid-state electronic switch with mechanical toggle is used, then switching control is achieved, but hand contact is required causing contamination risks
Solution Approach 1:
The patent replaces the mechanical toggle switch with a touchless electronic control system using infrared sensors or electrostatic induction sensors. This substitution eliminates the need for hand contact with mechanical components, preventing contamination in environments like kitchens and hospitals, while maintaining intuitive operation through motion detection or proximity sensing.
Solution Approach 2:
The patent introduces detection devices (infrared sensors or electrostatic induction sensors) as intermediaries between the user and the electronic switch. These sensors detect motion or proximity signals without requiring direct contact, thereby preventing contamination while enabling easy operation through non-contact control mechanisms.
3Reliability
If infrared sensor based touchless switch is used, then contamination is avoided, but circuit design becomes complicated
Solution Approach 1:
The patent integrates multiple control functions (on/off switching, dimming control, and timer management) into a single microcontroller-based electronic switch system. This universal design allows the system to perform various functions using a unified circuit architecture, reducing overall complexity compared to separate specialized circuits for each function while maintaining touchless operation capabilities.
Solution Approach 2:
The patent combines the detection device, microcontroller, and controllable switching elements into an integrated electronic switch system. By merging these components into a unified circuit design, the patent simplifies the overall system architecture while maintaining touchless operation and multiple control functions, avoiding the complexity of separate independent circuits.
4Ease of operation
If prior electronic switch solutions are used, then touchless operation is achieved, but power transmission control is inefficient
Solution Approach 1:
The patent implements a microcontroller-based control system that monitors and adjusts power transmission to lighting loads in real-time. The system uses feedback from detection devices to optimize power delivery, enabling efficient dimming control and power management while maintaining touchless operation, thereby improving power transmission efficiency compared to prior electronic switch solutions.
Solution Approach 2:
The patent uses a controllable semiconductor switching element (triac) that can dynamically adjust its conduction state based on control signals from the microcontroller. This dynamic control enables precise power transmission management, allowing efficient power delivery adjustment while maintaining touchless operation capabilities, thereby resolving the inefficiency in power transmission control.
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 system provides a safe, user-friendly, and efficient means of controlling lighting systems, avoiding electrical arcs and contamination risks while allowing for seamless integration of multiple control functions without hardware complexity, enabling precise control of lighting power and color temperature.
Implementation Method 1
detection devices like infrared sensors or electrostatic induction sensors to provide contactless operation
Implementation Method 2
A controllable semiconductor switching element, such as a triac, has nearly zero voltage between two output-electrodes in conduction mode and nearly zero current through two output-electrodes in cut-off mode
Implementation Method 3
a first lighting load for emitting light with a first color temperature, a second lighting load for emitting light with a second color temperature
Data Source
AI summary
A color temperature switching scheme for an LED lighting device is disclosed. The color temperature switching scheme comprises a plurality of different color temperature performances correspondingly generated by a plurality of different paired combinations of a first electric power allocated to a first LED load emitting a light with a first color temperature and a second electric power allocated to a second LED load emitting a light with a second color temperature such that a mingled color temperature between the first color temperature and the second color temperature can be generated thru a light diffuser. For tuning the mingled color temperature of the LED lighting device a reverse yet complementary power adjustment process for distributing a total electric power T between the first LED circuit and the second LED circuit is required such that a total light intensity remains unchanged while the mingled color temperature is being adjusted.