LED Circuit Color Temperature Adjustment via Series-Parallel Topology
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Solution Overview
Problem
The LED industry faces challenges in designing and manufacturing LED strings with adjustable color temperature to meet specific design specifications and simulate natural light, as existing technologies struggle to efficiently adjust color temperature while maintaining cost-effectiveness.
Innovation Solution
The proposed LED circuit adjusts color temperature by combining LED strings connected in parallel and series, utilizing resistors, regulator modules, and switch assemblies to control current and voltage, allowing for flexible adjustment of color temperature curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED strings with fixed color temperature are used, then manufacturing is simple and cost-effective, but color temperature adjustment capability is lost
Solution Approach 1:
The LED lighting system is segmented into multiple LED strings, each with different color temperatures (e.g., warm white 3000K, natural white 6504K, cold white 9300K). Each string can be independently controlled through separate circuit paths, allowing the system to achieve color temperature adjustment by selectively activating different segments rather than requiring complex adjustment circuits for a single LED string.
2Adaptability or versatility
If multiple LED strings with different color temperatures are connected in parallel, then color temperature adjustment range is improved, but circuit complexity increases
Solution Approach 1:
Multiple LED strings with different color temperatures are merged into a single parallel circuit configuration that shares common power supply connections. The patent combines several LED strings with different color temperatures into one integrated circuit structure, where all strings receive power from the same power supply through parallel branches, simplifying the overall circuit design while maintaining color temperature adjustment capability.
3Use of energy by moving object
If series connection is used for LED strings, then voltage utilization is improved, but current control complexity increases
Solution Approach 1:
The patent employs dynamic switching mechanisms that can change the circuit configuration from series to parallel connections based on operating conditions. This dynamic reconfiguration allows the system to optimize voltage utilization when in series mode while simplifying current control when switching to parallel mode, providing flexibility in handling different operational requirements without being constrained by a fixed connection topology.
4Adaptability or versatility
If natural light simulation is implemented with gradual color temperature change, then lighting quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent achieves natural light simulation by using multiple LED strings with different color temperatures that can be independently controlled. Instead of using expensive tunable LED chips or complex color mixing systems, the invention employs standard LED strings with fixed color temperatures, controlling them through simple on/off switching or dimming circuits. This approach uses cost-effective, readily available components to simulate the gradual color temperature changes of natural light.
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 enables precise adjustment of color temperature, simulating natural light by gradually increasing color temperature from low to high, enhancing design flexibility and cost-effectiveness in LED string manufacturing.
Implementation Method 1
The present white LEDs mostly are made by coating a layer of pale yellow phosphor on a blue LED (near-UV, wavelength is from 450 nm to 470 nm). LED string emit first, and then illuminate to the phosphor, so that it looks white.
Implementation Method 2
LED string emit first, and then illuminate to the phosphor, so that it looks white.
Data Source
AI summary
An LED circuit with color temperature adjustment comprises a first LED string, a resistor, and a second LED string. The first LED string has a first color temperature. The resistor is connected in series with the first string. The second LED string has a second color temperature. The first LED string is connected in parallel with the second LED string. The second color temperature is higher than the first color temperature. The integrated color temperature of the first LED string and the second LED string increases when the total current of the first LED string and the second LED string increases. The present disclosure not only can provide an LED circuit with color temperature adjustment, but also can provide an LED circuit which can adjust the color temperature by the combinations of the LED strings connected in parallel or series.