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 in settings like kitchens and hospitals. Additionally, prior solutions like infrared sensors have complex constructions and inefficient power control mechanisms.
Innovation Solution
A microcontroller-based electronic switch with controllable semiconductor switching elements and detection devices like infrared ray sensors or electrostatic induction sensors, which convert external motion signals into control signals to manage lighting loads' power levels and color temperatures without manual contact, ensuring safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical-type electric switch is used, then manual on/off control is achieved, but electric sparks may ignite fire in gas-prone environments
Solution Approach 1:
The patent replaces mechanical switches with solid-state electronic switches (triacs or thyristors) that control power transmission through semiconductor elements rather than mechanical contact. This substitution eliminates the generation of electric sparks while maintaining manual control capability through touchless operation using infrared sensors or electrostatic induction sensors.
2Ease of operation
If mechanical toggle or spring button is used for electronic switch operation, then manual operation is facilitated, but hand contact causes contamination in kitchens and hospitals
Solution Approach 1:
The patent replaces mechanical toggle switches and spring buttons with touchless control mechanisms. Infrared sensors detect motion signals and electrostatic induction sensors detect proximity signals to activate the electronic switch without requiring hand contact. This maintains ease of operation while eliminating contamination risks in sensitive environments like kitchens and hospitals.
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 and convert them into control signals, allowing touchless operation while maintaining intuitive user control of the lighting system.
3Object-generated harmful factors
If infrared sensor is used for touchless control, then contamination is prevented, but construction becomes complicated
Solution Approach 1:
The patent integrates the detection device with the electronic switch into a unified control unit. The same detection device can operate in different modes (motion detection for on/off control, proximity detection for dimming) depending on the control signal received, reducing the need for separate components and simplifying the overall construction while maintaining touchless operation capabilities.
4Ease of operation
If prior art control systems are used, then basic on/off control is achieved, but power control efficiency is insufficient
Solution Approach 1:
The patent implements dynamic power control by varying the conduction angle of the triac or thyristor based on detection signals. The electronic switch can adjust power transmission continuously rather than simply on/off, enabling efficient dimming control and adaptive lighting that responds to user presence and environmental conditions, thereby improving power control efficiency.
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 safe, efficient, and user-friendly control system for lighting, preventing electrical arcs and contamination, with the ability to manage lighting power levels and color temperatures seamlessly, enhancing safety and usability in various environments.
Implementation Method 1
detection devices like infrared ray sensors or electrostatic induction sensors, which convert external motion signals into control signals
Implementation Method 2
detection devices like infrared ray sensors or electrostatic induction sensors, which convert external motion signals into control signals
Implementation Method 3
A plurality of controllable semiconductor switching elements like triacs or thyristors are connected in parallel between the power source and a plurality of lighting loads
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.