LED Color Temperature Tuning With Constant Light Output
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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 solid-state electronic switches have complexities in circuit design and inefficient power transmission.
Innovation Solution
A microcontroller-based electronic switch with controllable semiconductor switching elements and a detection device, such as an infrared ray sensor or electrostatic induction sensor, that converts external motion signals into control signals to manage on/off and dimming operations, ensuring safe and efficient power transmission without manual contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical switches are used for lighting control, then manual operation is achieved, but safety concerns arise in gas-prone environments due to electric sparks
Solution Approach 1:
The patent replaces mechanical switches with solid-state electronic switches that use semiconductor devices (triacs, thyristors) to control lighting. This substitution eliminates the mechanical contact that generates electric sparks, thereby resolving the safety issue in gas-prone environments while maintaining ease of operation through electronic control
2Object-affected harmful factors
If solid-state electronic switches are used to avoid electric arcs, then safety is improved, but circuit design complexity increases
Solution Approach 1:
The patent introduces optical coupling elements as intermediaries between the control circuit and the power switching elements. This optical coupling isolates the control side from the high-power side, simplifying the overall circuit design while maintaining safety by preventing direct electrical contact and arc generation
Solution Approach 2:
The patent employs zero-crossing-point detection to automatically synchronize the switching action with the AC power cycle. This self-synchronizing mechanism eliminates the need for complex timing circuits, reducing design complexity while maintaining safe operation by ensuring switching occurs at optimal points in the power cycle
3Ease of operation
If mechanical toggle switches are used for on/off control, then manual operation is simple, but hand contact causes contamination in places like kitchens and hospitals
Solution Approach 1:
The patent replaces mechanical toggle switches with touchless electronic control interfaces that detect hand presence or motion and automatically activate or adjust lighting. This eliminates the need for direct hand contact with switches, preventing contamination in sensitive environments like kitchens and hospitals while maintaining simple operation through automatic detection
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 apparatus, preventing electrical arcs and allowing for touchless operation, thereby reducing contamination risks and enhancing safety and efficiency in controlling lighting systems.
Implementation Method 1
a detection device, such as an infrared ray sensor or electrostatic induction sensor
Implementation Method 2
a detection device, such as an infrared ray sensor or electrostatic induction sensor
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.