LED Driving System Power Line Signal Transmission Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED light string driving systems based on power line signal transmission suffer from unstable light emission due to weak signal generation capabilities, leading to inconsistent display effects.
Innovation Solution
A light-emitting diode driving system comprising a switch unit with a main and secondary power supply, controlled by a unit with a power conversion device and single-chip microcomputer, ensuring continuous power and signal delivery through alternating high and low level signals, maintaining the switch unit in a turned-on state and stabilizing the LED light string operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a Zener diode and capacitor are used as signal generation circuit, then the number of signal cables is reduced, but the driving capability of the signal generation circuit becomes weak and the light string display effect becomes unstable
Solution Approach 1:
The patent divides the power supply system into main power supply and secondary power supply channels, each providing power through separate switch units (first switch and second switch). This segmentation ensures that each channel can independently control power delivery to different LED light string groups, preventing the instability caused by a single weak signal generation circuit while still reducing cable complexity through the power line carrier approach.
Solution Approach 2:
The patent changes the power delivery parameters by using two different power supply voltages (main power supply voltage and secondary power supply voltage) that are both higher than the LED forward voltage. This parameter change enables strong driving capability through the power line, resolving the weak driving issue of conventional signal generation circuits while maintaining signal transmission through the same power line.
2Loss of information
If the switch unit is turned off to send signal voltage, then signal transmission is achieved, but the LED light string enters non-operating state causing unstable light emission
Solution Approach 1:
The patent ensures continuous power delivery to the LED light string by using two switch units that operate in complementary fashion. While one switch is turning off to transmit the signal, the other switch remains on to maintain power supply continuity. This eliminates the interruption in power delivery that causes unstable light emission, while still achieving signal transmission through the power line voltage changes.
Solution Approach 2:
The patent implements periodic switching of the two switch units in response to control signals. The switches alternate between on and off states in a periodic manner, creating a continuous power delivery pattern that maintains stable LED operation. This periodic action ensures that at any given time, at least one switch is conducting power, preventing the non-operating state that causes light emission instability.
Data Source
AI summary
A light-emitting diode driving system for transmitting a signal based on a power line comprising a switch unit, a control unit, a main power supply, and a secondary power supply, wherein the switch unit comprises a main input end, a secondary input end, an output end, and a controlled end. When the control unit is in an operating state, the switch unit is turned on. When the control unit outputs a high level signal to control the switch unit to be turned on, the main power supply outputs a main direct current power source to the switch unit, and when the control unit outputs a low level signal to control the switch unit to be turned on, the secondary power supply outputs a secondary direct current power source to the switch unit. The system can make the light emission effect of the light string more stable.