LED Color Temperature Tuning With Reverse Power Balancing
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Solution Overview
Problem
Existing lighting control systems, particularly those using mechanical switches, pose safety concerns in gas-explosion prone areas and require manual operation, which can lead to contamination issues in environments like kitchens and hospitals. Additionally, prior solutions like infrared sensors have complex constructions and inefficient power control.
Innovation Solution
A microcontroller-based electronic switch with controllable semiconductor switching elements and various detection devices (infrared ray sensor, electrostatic induction sensor, or direct touch interface) that detects external motion signals to control lighting loads, allowing for on/off switching, dimming, and color temperature adjustment without manual contact, ensuring safe and efficient operation.
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 electrical arcs are generated causing safety hazards in gas-explosion prone areas
Solution Approach 1:
The patent replaces the mechanical switch with a solid-state electronic switch using a triac (thyristor) that controls power transmission through electronic switching rather than mechanical contact. This eliminates electrical arcs and sparks while maintaining reliable on/off control, making it safe for gas-explosion prone areas.
2Reliability
If solid-state electronic switch with mechanical toggle is used, then electrical arc is avoided, but hand contact is required causing contamination in kitchens and hospitals
Solution Approach 1:
The patent replaces the mechanical toggle switch with a touchless control interface that detects hand presence or motion through optical or capacitive sensors. This allows users to operate the electronic switch without direct contact, preventing contamination in environments like kitchens and hospitals while maintaining the arc-free safety benefits of solid-state switching.
Solution Approach 2:
The patent introduces an intermediary detection device (optical sensor or capacitive sensor) that mediates between the user's hand and the electronic switch circuit. The sensor detects the user's presence or gesture and triggers the triac switching without requiring direct hand contact with the switch mechanism, thus eliminating contamination risks.
3Object-affected harmful factors
If infrared sensor is used for touchless control, then hand contact is eliminated, but construction and circuit design become complicated
Solution Approach 1:
The patent integrates the detection function directly into the existing electronic switch circuit using a microcontroller unit that can serve both as the control processor and the detection interface. This multi-functional approach allows the same microcontroller to handle both the triac control logic and the touchless detection, simplifying the overall circuit design compared to separate dedicated infrared sensor circuits.
4Ease of operation
If prior art control methods are used, then basic on/off control is achieved, but efficient power transmission control to various electric impedances is lacking
Solution Approach 1:
The patent implements dynamic power transmission control by using the microcontroller to adjust the triac firing angle and duty cycle based on the detected load impedance and user requirements. This allows efficient power transmission to various electric impedances (different lighting loads) by optimizing the switching parameters in real-time, rather than using fixed on/off 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 solution provides a safe, efficient, and user-friendly control system for lighting that prevents electrical arcs, reduces contamination risks, and offers versatile control over lighting parameters through software-driven operation, integrating multiple functions without hardware complexity.
Implementation Method 1
detection devices (infrared ray sensor, electrostatic induction sensor, or direct touch interface) that detects external motion signals
Implementation Method 2
detection devices (infrared ray sensor, electrostatic induction sensor, or direct touch interface) that detects external motion signals
Data Source
AI summary
A color temperature switching scheme for an LED lighting device is disclosed. The color temperature switching scheme includes 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.