LED Control Apparatus Voltage Detection Extinction Mechanism
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Solution Overview
Problem
In vehicle lamps using LED strings, damaged LEDs can lead to uneven lighting, affecting both aesthetics and driving safety due to insufficient luminance, as existing systems fail to completely extinguish LEDs when some are damaged.
Innovation Solution
A control apparatus comprising an LED unit, voltage conversion unit, voltage difference detecting unit, control unit, hysteresis driving unit, and switching unit, which detects output voltage changes and controls the voltage conversion unit to stop converting input voltage when a predetermined voltage is not met, ensuring all LEDs are extinguished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED string continues to operate with some damaged LEDs, then the system maintains operational continuity, but the overall appearance becomes unaesthetic and driving safety is affected due to insufficient luminance
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the voltage across each LED or LED group. When a damaged LED causes voltage to exceed or fall below predetermined thresholds, the control unit receives feedback signals and automatically adjusts the driving state, switching off affected LED groups to maintain overall luminance and appearance quality.
Solution Approach 2:
The system dynamically adjusts the operating state of LED groups based on real-time voltage monitoring. The control unit can switch between different operating modes (all LEDs on, selective LED groups on, or all LEDs off) depending on the condition of individual LEDs, making the system adaptable to varying damage states while maintaining safety and aesthetics.
2Reliability
If a control apparatus is added to monitor and control LED operation, then complete extinction of damaged LEDs is achieved, but device complexity increases
Solution Approach 1:
The control apparatus monitors voltage conditions across the LED string and automatically determines when LEDs are damaged based on predetermined voltage thresholds. The system self-diagnoses LED conditions and self-corrects by switching off affected groups without requiring external intervention or complex processing, simplifying the overall control architecture.
Solution Approach 2:
The patent uses voltage threshold parameters as critical control points. By monitoring whether voltage across LED groups exceeds or falls below predetermined thresholds, the system converts complex LED status detection into simple parameter comparison, reducing control complexity while maintaining reliable damage detection.
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
The solution ensures that all LEDs are completely extinguished when at least one is damaged, maintaining lamp aesthetics and safety by preventing insufficient luminance in vehicle lamps.
Implementation Method 1
the voltage difference detecting unit is electrically connected to the LED unit for detecting an output voltage of the LED unit
Implementation Method 2
the transistor is electrically connected to the first resistor, the second resistor, and a negative terminal of the LED unit respectively
Data Source
AI summary
A control apparatus for light emitting diodes (LEDs) includes a voltage conversion unit connected to an LED unit to convert an input voltage to supply the LED unit. A voltage difference detecting unit is connected to the LED unit for detecting an output voltage of the LED unit, and the voltage difference detecting unit includes a first resistor, a second resistor and a transistor. A control unit is connected to the voltage difference detecting unit and a hysteresis driving unit, and the control unit cooperates with the voltage difference detecting unit to provide a predetermined voltage. When the output voltage is less than the predetermined voltage, the control unit notifies the hysteresis driving unit to control the switching unit to be short-circuited, so that the voltage conversion unit stops converting the input voltage to cause the LEDs to be completely extinguished.