Tunable LED Lighting Device with Merged Control Circuit
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Solution Overview
Problem
Controllable lighting devices that mimic natural daylight are complex to manufacture and use, making their distribution and control difficult due to the intricacies of color temperature and brightness adjustments.
Innovation Solution
A lighting device with an LED light source comprising three strands (first, second, and third) with different correlated color temperatures, where the third strand is always active and can be independently driven, allowing for simple switching between the first and second strands using a switch controller, enabling easy adjustment of color temperature and brightness through a dimmable LED driver and external dimmers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED strands with different color temperatures are used to create tunable white light, then the adaptability and versatility of the lighting device is improved, but the device complexity increases due to the need for separate control circuits
Solution Approach 1:
The patent combines multiple LED strands with different color temperatures into a single lighting device and merges their control functions into one unified control circuit. The control circuit can selectively activate different LED strands (first strand with 2000K, second strand with 4000K, third strand with 6000K) to produce tunable white light, eliminating the need for separate control circuits for each strand while maintaining full adaptability.
2Ease of operation
If separate control circuits are used for each LED strand to enable independent control, then the ease of operation is improved, but the manufacturing precision and reliability requirements increase
Solution Approach 1:
The control circuit integrates multiple control functions into a single unified design that can selectively activate different LED strands. The circuit includes switching elements that can independently control each strand through a unified control interface, simplifying manufacturing while maintaining independent control capability for each LED strand.
3Ease of manufacture
If LED strands are connected in parallel to the power supply, then the ease of manufacture is improved, but the loss of energy increases due to intrinsic differences in electrical characteristics
Solution Approach 1:
The control circuit provides localized current control for each LED strand through individual switching elements. This allows the circuit to compensate for intrinsic electrical characteristic differences between strands by adjusting the current distribution locally, optimizing energy efficiency while maintaining the simple parallel connection structure for ease of manufacture.
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
This solution provides a tunable white light source with a 'glow dimming effect' that mimics natural daylight, enhancing user well-being by allowing easy control of color temperature and brightness, reducing manufacturing complexity and energy consumption through wireless communication and sensor integration.
Implementation Method 1
The lighting device includes an LED light source, wherein the LED light source includes a first LED strand for generating a first light, in particular a first white light
Data Source
AI summary
A lighting device including an LED light source, wherein the LED light source includes a first LED strand for generating a first light with a first correlated color temperature and a second LED strand for generating a second light with a second color temperature different from the first color temperature. The lighting device further comprises control electronics with a controllable LED driver for driving the LED light source, wherein the control electronics comprise a switch for switching between the first LED strand and the second LED strand so that either the first LED strand or the second LED strand is activated depending on the switch position. A lighting system comprising the lighting device is further disclosed.