Time-Division Power Extraction for Ghost-Free LED Switch-Off
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Solution Overview
Problem
Existing power extraction methods for electronic switches, particularly in conjunction with AC loads like LED lamps, result in high power consumption and incomplete or false switching off, leading to issues like 'ghost fire' and inefficiencies, hindering their adoption in consumer markets.
Innovation Solution
A virtual and parallel power extraction method using time division, where an AC load and an electronic switch are connected in parallel and controlled by time division devices to ensure power is not supplied simultaneously, leveraging energy storage characteristics to manage power distribution efficiently during switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If leakage current power extraction scheme is used for series connection of electronic switch and AC load, then the load can be turned off, but power consumption of electronic switch during normal operation and wireless communication is relatively high
Solution Approach 1:
The patent segments the power extraction function into two separate devices: a load end time division power extraction control device connected with the load, and a switch end time division power extraction control device connected with the power supply. This segmentation allows each device to independently manage power extraction during different time periods, reducing the power consumption burden on the electronic switch while maintaining reliable switching off through coordinated operation.
2Reliability
If current limiting mode is adopted to enable load to not work when lamp is turned off, then switching off is achieved, but LED lamp flickers periodically or cannot be turned off completely (ghost fire phenomenon)
Solution Approach 1:
The patent implements periodic action by using time division control where the load end device and switch end device alternately extract power during different time periods within each AC cycle. This periodic coordination ensures that power is completely extracted during the off period, preventing ghost fire and flicker phenomena while maintaining reliable switching off.
3Ease of operation
If electronic switch is used with AC load, then load control is achieved, but power consumption during wireless communication is high and popularization in consumer market is difficult
Solution Approach 1:
The patent merges the power extraction function with the existing load control functionality by integrating time division power extraction control devices at both the load end and switch end. This merging allows the system to perform both load control and power extraction using the same control infrastructure, reducing additional power consumption during wireless communication while maintaining ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively reduces power consumption and ensures complete switching off of loads like LED lamps, eliminating 'ghost fire' and enhancing the efficiency and popularity of electronic switches in consumer markets.
Implementation Method 1
use energy storage characteristics of the alternating current load and a power supply of the electronic switch
Data Source
AI summary
A virtual and parallel power extraction method by using time division, comprising an alternating current load (1), a load end time-division power extraction control device (2), a switch end time-division power extraction control device (3), and a switch end power supply load (4). The alternating current load (1) is connected in parallel with the load end time-division power extraction control device (2); the switch end time-division power extraction control device (3) is connected in parallel with the switch end power supply load (4); a combination body formed by connecting the alternating current load (1) with the load end time-division power extraction control device (2) in parallel and the combination body formed by connecting the switch end time-division power extraction control device (3) with the switch end power supply load (4) in parallel are together connected in series in an alternating current circuit. The present invention provides an efficient power extraction method between an electronic switch and a connected load on the premise of having no a neutral line, and particularly solves the problem that the electronic switch is falsely turned off or incompletely turned off for a low-power LED lamp.