LED Control Circuit Synchronization Signal Reduces Transmission Lines
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Solution Overview
Problem
Existing light emitting diode (LED) lamp string modules face issues with increased complexity and cost due to the need for multiple power and signal transmission lines, especially when one module becomes abnormal, as current control methods either fail to drive remaining modules in series connections or require excessive control lines in parallel connections.
Innovation Solution
A light emitting diode control circuit with a synchronization signal is introduced, comprising a signal coupling unit, operational amplifier, synchronization and control logic unit, light signal generating unit, output logic unit, and current output unit, which reduces the number of transmission lines by using a synchronization clock signal generated from rectified power to drive LEDs simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting diode lamp string modules are connected in series, then the connection is simple and easy to install, but the control signal cannot be transmitted to drive all remaining modules when one module becomes abnormal
Solution Approach 1:
The system segments the control signal transmission by introducing synchronization clocks and address signals that allow each module to be independently addressed and controlled, enabling the controller to selectively drive specific modules even when others are abnormal
Solution Approach 2:
The patent introduces an intermediary control circuit within each module that receives and processes control signals, allowing the controller to communicate with individual modules through a standardized interface while maintaining series connection simplicity
2Reliability
If light emitting diode lamp string modules are connected in parallel, then the remaining modules can still be controlled when one module is abnormal, but the amount of control lines and address lines increases proportionally
Solution Approach 1:
The patent merges the control line and address line functions into a single integrated control signal transmission path, where the controller sends combined control signals that include both addressing and control information, eliminating the need for separate control and address lines for each module
Solution Approach 2:
The control circuit within each module is designed to be universal, capable of receiving and processing the same control signal format regardless of which module it is, allowing a single control line to address and control any module in the system
3Adaptability or versatility
If many power transmission lines and signal transmission lines are used to control the colors and intensities of the light emitting diode lamp string modules, then the control functionality is comprehensive, but the cost increases
Solution Approach 1:
The system uses periodic synchronization clocks to transmit control information, where control data is embedded in periodic signal cycles, allowing multiple control functions to be transmitted through a single time-multiplexed channel
Solution Approach 2:
The patent controls different LED parameters (color, intensity) by changing the characteristics of the control signal itself, such as pulse width modulation for intensity control and frequency encoding for color selection, rather than using separate lines for each parameter
Data Source
AI summary
A light emitting diode control circuit with synchronization signal includes a signal coupling unit, an operational amplifier, a synchronization and control logic unit, a light signal generating unit, an output logic unit and at least a current output unit. The synchronization and control logic unit sends a synchronization clock signal to the light signal generating unit. The light signal generating unit sends a light control signal to the output logic unit. According to the light control signal, the output logic unit is configured to control the current output unit to drive at least a light emitting diode.