LED Power Supply Safe Lamp Replacement Control
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Solution Overview
Problem
Existing LED illumination systems lack a method to safely replace LED lamps without stopping the electricity supply, which is necessary due to the potential for reduced light intensity and shortened lifespan when a single LED element disconnects or is shorted, and there is no teaching on how to handle this situation in the related art.
Innovation Solution
An LED illumination system with a power supply device that includes a current feedback control unit, a first voltage comparison unit, and a semiconductor switch element, allowing for safe mounting and demounting of LED lamps by detecting the electric current and voltage states, enabling constant current control and safe voltage adjustments to prevent electric shock during demounting and ensure constant current operation during mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If LED lamp replacement is performed in existing LED illumination systems, then the LED lamp can be replaced, but the electricity supply must be stopped which causes interruption of illumination
Solution Approach 1:
The power supply device performs preliminary detection of the LED lamp mounting state before replacement operations. The detection unit checks whether the LED lamp is properly mounted, and the control unit prepares the circuit state in advance by opening the switch or reducing output voltage when demounting is detected, ensuring safe replacement without interruption to the overall illumination system.
2Ease of operation
If LED lamp demounting is performed without voltage reduction, then replacement operation is simple, but electric shock hazard occurs due to high voltage
Solution Approach 1:
The power supply device applies preliminary anti-action by detecting when the LED lamp is demounted and automatically reducing the output voltage to a safe level before the user completes the demounting operation. This prevents electric shock hazard while maintaining ease of operation, as the voltage reduction occurs automatically without requiring user intervention.
Solution Approach 2:
The detection unit continuously monitors the LED lamp mounting state and provides feedback to the control unit. When demounting is detected, the control unit responds by reducing the output voltage to a safe level, creating a closed-loop control system that ensures operator safety while maintaining operational simplicity.
3Illumination intensity
If LED elements are connected in series to ensure constant current and brightness, then light intensity is maintained, but if one element disconnects or shorts, the entire LED lamp fails or current increases dangerously
Solution Approach 1:
The power supply device uses feedback control by detecting the voltage across the LED lamp and comparing it with expected values. When an abnormality such as disconnection or short circuit is detected in the LED elements, the control unit responds by opening the switch or reducing output voltage, preventing dangerous current increases and protecting the entire illumination system.
4Object-affected harmful factors
If the power supply device stops electricity supply during LED lamp replacement, then safety is ensured, but illumination interruption occurs
Solution Approach 1:
The power supply device applies local quality by isolating only the specific circuit portion where the LED lamp is being replaced. The switch unit opens or voltage reduction occurs only in the LED lamp circuit, while other parts of the illumination system continue to receive power normally, maintaining overall illumination continuity while ensuring safety during local replacement operations.
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
Enables safe replacement and restoration of LED lamps without stopping the electricity supply, maintaining light intensity and extending the lifespan of the LED illumination system by detecting and managing the states of LED lamp connection and disconnection.
Implementation Method 1
a current feedback control unit having a detection resistor to detect an electric current flowing through the load
Implementation Method 2
a semiconductor switch element connected in series between the load and the detection resistor
Data Source
AI summary
An LED illumination system includes: a load including an LED lamp; and a power supply device, the LED lamp configured to be physically mounted on and demounted from the power supply device, the power supply device comprising: a current feedback control unit; a first voltage comparison unit configured to determine whether the load is in a mounted state; a voltage feedback control unit configured to decrease the voltage of the power supply device to a safe voltage when demounting, and to increase the voltage of the power supply device to perform the constant current control when mounting; and a semiconductor switch element connected in series between the load and the detection resistor, wherein the mounted and demounted states of the load is detected by a voltage of a main electrode of a high potential side of the semiconductor switch element.