LED Lighting Module Tunable Correlated Color Temperature Control
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Solution Overview
Problem
Existing LED lighting modules require complex and costly processors to control and adjust correlated color temperature and intensity, increasing production costs and complexity.
Innovation Solution
An LED lighting module with a dimmer unit, rectifier unit, and control unit that adjusts current flow through serially-connected LED strings with different correlated color temperatures, eliminating the need for a high-cost processor by using a simple circuit topology and control method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a processor is used to control and adjust the correlated color temperature and intensity of LED lighting modules, then the control precision and adjustment capability are improved, but the device complexity and production cost increase
Solution Approach 1:
The patent extracts the complex processor control function and replaces it with a simplified control circuit that uses basic electronic components (resistors, capacitors, transistors) to achieve the same control objectives. The control circuit directly manipulates LED string groups without requiring a processor, thereby reducing device complexity while maintaining control capability.
Solution Approach 2:
The patent replaces the expensive processor with inexpensive passive electronic components and simple active components. This substitution uses cheap, readily available components that can be easily replaced or adjusted, significantly reducing production cost while achieving the required control precision for correlated color temperature and intensity adjustment.
2Adaptability or versatility
If a processor is used to control and adjust the correlated color temperature and intensity of LED lighting modules, then the adjustment capability is improved, but the production cost increases
Solution Approach 1:
The patent removes the processor component entirely and extracts only the essential control functions, implementing them through a simple control circuit. This extraction eliminates the high cost associated with processors while preserving the ability to adjust correlated color temperature and intensity through manual or basic electronic control mechanisms.
Solution Approach 2:
The patent employs inexpensive electronic components such as resistors, capacitors, and transistors to replace the expensive processor. These cheap components can be easily manufactured and assembled, significantly reducing production cost while maintaining the adjustment capability for lighting control through alternative control methodologies.
3Adaptability or versatility
If multiple LED strings with different correlated color temperatures are used, then the tunable correlated color temperature is achieved, but the device complexity increases
Solution Approach 1:
The patent segments the LED lighting system into multiple independent LED string groups, where each group contains LEDs with different correlated color temperatures. This segmentation allows independent control of each group through simple circuitry, enabling tunable correlated color temperature without requiring complex processing to manage the diversity of LED strings.
Solution Approach 2:
The patent combines multiple LED string groups with different correlated color temperatures into a single lighting module, using a unified simple control circuit to manage all groups. This merging approach achieves tunable correlated color temperature output while avoiding the complexity of coordinating multiple separate control systems, as the simple control circuit handles all groups through basic electronic principles.
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 reduces production costs, allows for tunable correlated color temperature and dimmability, and ensures uniform light emission with symmetrical LED string arrangement, making it suitable for various indoor lighting fixtures.
Implementation Method 1
The LED lighting unit comprises a plurality of serially-connected LED strings, each of the LED strings has a predetermined correlated color temperature
Implementation Method 2
The rectifier unit is electrically connected with an output of the dimmer unit and configured to receive the first AC signal and convert the first AC signal into a first DC signal
Data Source
AI summary
An LED lighting module comprises a plurality of serially-connected LED strings, which include N LED strings from a first LED string to an Nth LED string, and each LED string has a specific driven voltage. The control method comprises steps of: (a) receiving an AC voltage signal and converting the AC input signal into a first AC signal; (b) receiving the first AC signal and converting the first AC signal into a first DC signal; and (c) if the first DC signal exceeds the sum of the driven voltages from the first LED string to an nth LED string, driving the serially-connected LED strings from the first LED string to the nth LED string sequentially, wherein n is smaller than or equal to N, so as to adjust the correlated color temperature of the light emitted by the LED lighting module.