LED Lamp Dimming via Power-Signal Demodulation and Color Control
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Solution Overview
Problem
Existing LED dimming technologies face issues such as reduced luminous efficiency, flickering, complex wiring, and inconsistent voltage distribution due to electrolytic capacitors, and limited color temperature adjustment capabilities, leading to increased production costs and inventory pressures.
Innovation Solution
An LED lamp lighting system with a demodulating module to generate dimming control signals, a driving circuit to adjust power supply based on these signals, and a color temperature control device to blend LED unit colors, along with a capacitor voltage balancing mechanism to ensure consistent voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phase cutting/chopping is used for dimming control, then dimming effect is achieved, but luminous efficiency is reduced and flickering occurs
Solution Approach 1:
The patent introduces a demodulating module as an intermediary component that extracts dimming information from the power supply signal without directly modifying the LED driving signal. This mediator approach allows dimming control to be achieved while maintaining the integrity of the LED drive waveform, thereby preventing luminous efficiency reduction and flickering.
Solution Approach 2:
The patent replaces the traditional mechanical/electrical phase cutting method with a signal processing approach using demodulation technology. Instead of physically cutting the power waveform to control dimming, the system uses a demodulating module to extract dimensional information from the power signal and processes it through a driving circuit, substituting a more efficient electronic control mechanism.
2Ease of operation
If separate signal lines are used for dimming control in multiple lamps, then dimming control is achieved, but wiring complexity is greatly increased
Solution Approach 1:
The patent makes the power supply signal serve multiple functions: it provides both power to the LED lamp and carries dimming control information through modulation. The demodulating module extracts the dimming information from the power signal, allowing a single wire to perform both power transmission and control functions, thereby eliminating the need for separate dimming signal lines in multi-lamp applications.
Solution Approach 2:
The patent merges the power supply function and dimming control function into a single integrated system. By modulating the power supply signal to encode dimming information and using a demodulating module to extract this information, the system combines what were previously separate functions (power delivery and dimming control) into one unified approach, significantly reducing wiring complexity.
3Strength
If two electrolytic capacitors are connected in series to increase withstand voltage, then voltage stability is improved, but voltage distribution consistency deteriorates
Solution Approach 1:
The patent introduces a feedback mechanism through the demodulating module that continuously monitors and adjusts the voltage distribution across electrolytic capacitors. By extracting dimensional information from the power supply signal and using it to control the driving circuit, the system can compensate for voltage imbalances between series-connected capacitors, maintaining consistent voltage distribution while preserving the enhanced withstand voltage capability.
Data Source
AI summary
An LED lamp lighting system is disclosed, comprising a driving circuit, an LED module, and a demodulating module. The demodulating module is electrically connected to an external power supply and is configured to generate a dimming control signal by extracting dimming information embedded within a received external power signal. The driving circuit, also electrically connected to the external power supply and the demodulating module, is designed to convert the received external power signal into a driving power supply and adjust the driving power supply in accordance with the dimming control signal. The LED module, electrically connected to the driving circuit, receives the driving power supply and illuminates accordingly. This system enables precise dimming control of LED lamps by utilizing dimming information conveyed through the external power signal.