LED Driver Signal Segmentation for Dimming Efficiency
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Solution Overview
Problem
Existing LED lighting systems face challenges in achieving efficient dimming control, as conventional methods often result in lowered lighting efficiency or light-flickering due to interference with the waveform of the modulated input voltage, and require complex wiring for multiple LED lamps.
Innovation Solution
A dimming signal generating module and a signal combining processing module are employed to generate and combine dimming signals with power signals, allowing for efficient dimming control of LED lamps without the need for separate signal lines, thereby simplifying the installation and operation of multiple LED lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phase cutting is performed to adjust the effective value of input voltage for dimming control, then dimming effect is achieved, but lighting efficiency is lowered and light-flickering occurs
Solution Approach 1:
The patent segments the dimming control function into two independent parts: (1) phase cutting circuit that processes input voltage without affecting LED driving, and (2) separate dimming control circuit that receives dimming signal and controls LED luminance through independent voltage adjustment. This segmentation allows phase cutting to be performed for signal extraction while the LED driving voltage remains unaffected, thus maintaining lighting efficiency while achieving dimming control.
Solution Approach 2:
The patent introduces an intermediary dimming control circuit that acts as a mediator between the phase cutting circuit and the LED driving circuit. This intermediary circuit extracts dimming signals from the phase-cut waveform, processes them through filtering and rectification, and generates independent dimming control voltages that regulate LED luminance without interfering with the main power delivery, thereby eliminating light-flickering while preserving lighting efficiency.
2Ease of operation
If separate signal lines are provided for each LED lamp to receive dimming signals, then dimming control is achieved, but wiring complexity is greatly increased
Solution Approach 1:
The patent makes the existing power supply lines multi-functional by enabling them to carry both power delivery and dimming control signals simultaneously. The phase cutting circuit processes the input voltage waveform to extract dimming information, and this same waveform is used to drive the LEDs through the power supply. This universal use of the power lines for both power and control functions eliminates the need for separate dimming signal lines, greatly reducing wiring complexity while maintaining full dimming control capability.
Data Source
AI summary
An LED lighting system, an LED lamp, and a driving device thereof are provided. The driving device is adapted for connecting to an output terminal of a dimmer and the driving device comprises a signal analyzing module, a signal generating module, and a power conversion module. The signal analyzing module is configured to analyze an output signal from the output terminal of the dimmer, in order to output a power signal through a first dimming output terminal and to output a dimming control signal through a second dimming output terminal. The signal generating module is configured to receive and transform the dimming control signal into a dimming instruction signal. The power conversion module is configured to perform power conversion on the power signal based on the dimming instruction signal, in order to adjust power supplying to the LED module.