LED Power Supply Overcurrent Protection via Impedance Compensation
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Solution Overview
Problem
LEDs experience overcurrent and reduced service life when connected to power supply apparatuses due to low impedance, leading to potential damage to both the LED and the power supply, especially when installed in a no-load state with continuous power supply.
Innovation Solution
A power supply apparatus for LEDs that includes a detector to determine if an LED is connected, a voltage dropper to regulate current, and a control switch to change the power path, ensuring that the current flowing through the LED is equal to or lower than a predetermined current until a constant current is controlled, thereby preventing overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the LED is connected to the power supply apparatus in a no-load state with continuous power supply, then the power supply can operate immediately, but a high surge current flows through the LED due to low impedance, causing damage and shortening service life
Solution Approach 1:
The patent applies preliminary action by detecting whether an LED is connected before full power is applied. The detector checks for LED presence, and only when detection confirms LED connection does the control switch enable full power supply. This prevents surge current damage by ensuring the LED is ready to receive power before it is applied, resolving the contradiction between immediate operation capability and LED service life.
2Ease of operation
If the LED is connected to the power supply apparatus, then the lighting device can function, but the low impedance of the LED causes momentary energy discharge that generates overcurrent, damaging both the LED and power supply apparatus
Solution Approach 1:
The patent uses an intermediary approach by introducing a detector and control switch as mediating components between the power supply and LED. The detector acts as an intermediary that monitors LED connection status, and the control switch serves as an intermediary that regulates power flow based on detection results. This intermediary mechanism prevents overcurrent damage while maintaining lighting function by controlling when full power is applied to the LED.
3Adaptability or versatility
If the power supply apparatus operates in a no-load state, then it can be installed with continuous power supply, but the stored energy creates a hazard that threatens user safety when the LED is subsequently connected
Solution Approach 1:
The patent implements feedback by using a detector that continuously monitors LED connection status and provides feedback to the control switch. When the detector senses LED connection, it sends feedback signals that trigger the control switch to enable power supply. This feedback mechanism ensures safe operation during installation with continuous power supply by preventing power discharge to unconnected LEDs, thus protecting user safety while maintaining installation flexibility.
Data Source
AI summary
A power supply apparatus for LED is provided. The power supply apparatus for LED includes a detector, a voltage dropper, and a control switch. The detector detects whether an LED is connected to the power supply apparatus. The voltage dropper drops a voltage applied to the LED. The control switch is connected to the voltage dropper in parallel, and changes a path of a power applied to the LED according to the detected result of the detector. Accordingly, the power supply apparatus for LED compensates for a low impedance of an LED to an impedance equal to or higher than a predetermined impedance at a time when connection of the LED is detected, thereby inhibiting an overcurrent from flowing in the LED.