LED Brightness Control via Single-Wire Current Sensing
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Solution Overview
Problem
Conventional LED brightness control systems face complexity and high costs due to extensive wiring requirements and voltage drop limitations, making it difficult to connect multiple LED lamps and limiting flexible configuration.
Innovation Solution
The system incorporates a sensing switch connected to multiple LED control devices via a single wire, utilizing a current rectifying unit, transimpedance amplification unit, and Schmidt circuit to convert current signals into voltage and square wave signals, allowing for independent positioning of the sensing switch and simplified wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sensing switch is connected to multiple LED drivers via two wires to enable voltage sensing control, then the LED lamps can be controlled for brightness adjustment, but the wiring complexity significantly increases as the number of LED lamps increases
Solution Approach 1:
The patent replaces the conventional voltage sensing method with a current sensing method. The sensing switch detects current signals instead of voltage signals, and transmits these current signals through a single wire to the LED control devices. This substitution fundamentally changes the sensing mechanism from voltage-based to current-based, enabling simplified single-wire connectivity while maintaining control functionality.
Solution Approach 2:
The single wire serves multiple functions: it carries the current signal from the sensing switch to multiple LED control devices simultaneously, and also provides a common reference potential. This multi-functional use of a single wire eliminates the need for separate signal and reference wires, reducing wiring complexity while maintaining control capability.
2Adaptability or versatility
If the sensing switch is positioned far from the LED lamps to achieve independent positioning, then installation flexibility is improved, but significant voltage drop occurs in the connecting wires
Solution Approach 1:
The patent substitutes voltage sensing with current sensing. Current signals are less susceptible to voltage drop effects over long distances compared to voltage signals. The sensing switch detects current signals generated by environmental changes and transmits these current signals through the wire to LED control devices, maintaining signal integrity even when positioned far from the LED lamps.
3Productivity
If the sensing switch is connected to multiple LED drivers simultaneously to control more LED lamps, then the number of controllable lamps increases, but the voltage drop becomes significant and limits the number of connected lamps
Solution Approach 1:
The patent replaces voltage sensing with current sensing, which fundamentally changes how signals are transmitted. Current signals can be transmitted over longer distances and to multiple devices without significant voltage drop affecting performance. The sensing switch generates current signals that are transmitted through a single wire to multiple LED control devices, enabling control of more LED lamps simultaneously without the voltage drop limitations of conventional voltage sensing methods.
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 design reduces wiring complexity and manufacturing costs by enabling control of multiple LED lamps with a single wire, allowing for flexible configuration and efficient brightness adjustment.
Implementation Method 1
The current signal is converted into an optical signal by the optical output coupler
Implementation Method 2
A base of the optical receiving coupler receives the optical signal to generate a voltage signal corresponding to the current signal
Data Source
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AI summary
The present disclosure relates to an apparatus for controlling brightness of a LED lamp. The apparatus includes: a sensing switch and at least one LED control device. A transimpedance amplification unit converts a current signal into a voltage signal, and converts the voltage signal into a square wave signal in cooperation with a Schmidt circuit, such that the sensing switch can be connected to multiple LED control devices via a single wire, thereby controlling multiple LED lamps simultaneously. The sensing switch is independently disposed at a position to be sensed, therefore only a single wire is required to be disposed between the sensing switch and the LED control devices such that wiring is more easily implemented for the multiple LED control devices connected in parallel, and the number of the wires used is also greatly reduced, thereby simplifying the wiring between the sensing switch and the LED control devices and reducing a manufacture cost.