LED Lighting Apparatus with Segmented Series for Color Temperature Control
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Solution Overview
Problem
Current lighting technologies, particularly LED-based systems, face challenges in achieving balanced light efficiency and flexibility, as they often require multiple light sources to achieve desired color temperatures and brightness levels, which can lead to increased complexity and reduced lifespan due to constant operation.
Innovation Solution
A lighting apparatus comprising a rectifier, constant current circuits, and multiple LED series with distinct color temperatures, controlled by a controller that generates PWM signals to adjust the light output, allowing for mode switching and backup functionality, along with a motion sensor and wireless communication for external command integration, to optimize energy use and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED series with different color temperatures are used to achieve adjustable color temperature and brightness, then light efficiency and flexibility are improved, but device complexity increases
Solution Approach 1:
The lighting apparatus is divided into multiple LED series (first LED series with main color temperature, second LED series with low color temperature, third LED series with high color temperature), each controlled by separate constant current circuits. This segmentation allows independent control of each LED series to achieve different color temperatures and brightness levels, resolving the contradiction by providing adjustability while maintaining manageable complexity through modular design
Solution Approach 2:
The system dynamically adjusts the driving currents to each LED series based on operational status and control signals. The controller can switch between different operational modes (first mode with only first LED series, second mode with all LED series) and adjust brightness levels dynamically, providing flexibility without requiring permanent complex circuitry for all possible states
2Reliability
If multiple LED series operate constantly to provide backup functionality, then reliability is improved, but LED lifespan is reduced due to constant operation
Solution Approach 1:
The system implements periodic switching between operational modes rather than continuous operation of all LED series. The controller alternates between first mode (only first LED series operates) and second mode (all LED series operate), allowing non-operating LEDs to rest and extend their lifespan while maintaining backup functionality when needed
Solution Approach 2:
The second and third LED series are prepared in advance as backup components but remain inactive during normal operation. This preliminary preparation ensures immediate backup availability while avoiding the degradation that would result from continuous operation, thus extending overall system lifespan while maintaining reliability
3Adaptability or versatility
If PWM control signals are used to adjust light output, then flexibility and light efficiency are improved, but control complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: generating PWM control signals for dimming, switching between operational modes, and coordinating multiple constant current circuits. This multi-functionality consolidates control complexity into a single component rather than requiring separate control circuits for each LED series, resolving the contradiction by providing flexibility through integrated 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 enhances light efficiency and flexibility by allowing for adjustable color temperature and intensity, extends the lifespan of LEDs by using backup series when not needed, and enables remote control of lighting modes, thereby improving overall performance and user satisfaction.
Implementation Method 1
a rectifier converts an alternating current power to a direct current power
Implementation Method 2
LED lighting, a solid-state lamp that uses light-emitting diodes as the source of light
Implementation Method 3
The light emitting diodes shows a new type of illumination
Data Source
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AI summary
A lighting apparatus includes a rectifier, a constant current circuit, a first LED series, a second LED series, a third LED series and a controller. The rectifier converts an alternating current power to a direct current power. The constant current circuit generates a first driving current, a second driving current and a third driving current derived from the direct current power. The controller has a first mode to only turn on the first LED series and to turn off the second LED series and the third LED series. The controller has a second mode to adjust the first PWM signal, the second PWM signal and the third PWM signal to generate a corresponding color temperature.