Low Voltage Controller for LED Dimming and CCT Tuning
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Solution Overview
Problem
Conventional LED dimming systems face issues with compatibility, energy efficiency, and CCT tunability, leading to inconsistent performance, power factor imbalances, and limited control over LED lighting devices, particularly in residential and commercial settings.
Innovation Solution
A system utilizing two low-voltage controllers for dimming and CCT tuning, which converts these signals into PWM signals to control multiple LED light sources, maintaining an acceptable power factor and ensuring consistent dimming and CCT across all devices in a zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional TRIAC or phase-cut dimmers are used with LED-based lighting devices, then energy efficiency is improved, but dimming compatibility and performance consistency deteriorate
Solution Approach 1:
The patent introduces a dimming control circuit as an intermediary component between the conventional TRIAC dimmer and the LED driver. This control circuit receives the phase-cut signal from the dimmer, processes it to determine dimming level, and generates appropriate PWM control signals for the LED driver. This intermediary layer resolves the incompatibility between conventional dimmers and LED loads while maintaining energy efficiency.
2Ease of operation
If single channel wall dimmers are used, then installation simplicity is improved, but control versatility for multiple LED devices deteriorates
Solution Approach 1:
The dimming control circuit is designed with multi-functionality to handle various dimming signals (phase-cut, 0-10V, PWM) and control multiple LED devices simultaneously. The circuit can operate in different modes (single channel or multi-channel) and supports both dimming and CCT tuning functions, making it universally applicable to various lighting scenarios while maintaining simple installation through standard wiring interfaces.
3Device complexity
If conventional LED drivers are used, then device complexity is reduced, but power factor and harmonic distortion performance deteriorate
Solution Approach 1:
The patent introduces a power factor correction (PFC) circuit as an intermediary component in the LED driver system. This PFC circuit processes the input AC power before it reaches the LED driving circuitry, correcting power factor and reducing harmonic distortion. The PFC circuit acts as a mediator between the AC power source and the LED driver, improving power quality without significantly increasing overall system complexity.
4Measurement precision
If low voltage controllers are used for dimming and CCT tuning, then control precision is improved, but signal transmission distance and voltage drop issues worsen
Solution Approach 1:
The patent employs PWM (pulse-width modulation) signaling for transmitting dimming and CCT control commands. PWM signals are periodic digital signals that encode control information in the duty cycle rather than voltage level, making them immune to voltage drop and electrical noise. This periodic action allows precise control signals to be transmitted over long distances through standard low-voltage wiring without degradation, resolving the distance limitation of low-voltage analog controllers.
Data Source
AI summary
A dimming and correlated color temperature (CCT) tuning lighting system comprises a controller and multiple light-emitting diode (LED)-based lighting devices. Each lighting device comprises a control circuit, at least two LED driving circuits, and at least two types of LED-based light sources. When the controller receives low voltage dimming and CCT tuning signals from its inputs, it generates pulse-width modulated (PWM) dimming and CCT tuning signals delivered to the control circuit and at least two LED driving circuits in each of the multiple lighting devices, which then individually power the at least two types of LED-based light sources to emit a light with a lighting level and a CCT. The controller may be integrated in each of the multiple lighting devices to further simplify system design, ultimately achieving the lowest cost.