Over-voltage Protection Circuit for LED Modules
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Solution Overview
Problem
Electronic devices using LEDs for backlighting face component damage due to delayed over-voltage protection triggering in 2D mode, as the over-voltage protection voltage is set the same for both 2D and 3D modes, leading to prolonged activation and potential damage.
Innovation Solution
An over-voltage protection circuit with a control unit, over-voltage detection module, trigger module, and adjustment module that adjusts the detection voltage proportion based on 2D/3D signal inputs, allowing for quicker over-voltage protection in 2D mode by increasing the detection voltage proportion when a 2D signal is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the over-voltage protection voltage is set the same for both 2D and 3D modes, then the protection threshold is consistent across modes, but the protection triggering time is excessively long in 2D mode causing component damage
Solution Approach 1:
The patent applies dynamics by making the over-voltage protection threshold adjustable based on operating mode. The control unit dynamically changes the detection voltage proportion according to whether the device is in 2D or 3D mode, allowing the protection threshold to adapt to different work voltages and achieve timely protection in both modes
Solution Approach 2:
The patent changes the detection voltage proportion parameter based on operating mode. When in 2D mode, the detection voltage proportion is increased to accelerate protection triggering, while in 3D mode the proportion is decreased to match the higher work voltage, thus resolving the time delay issue without compromising protection effectiveness
2Speed
If the detection voltage proportion is increased for 2D mode, then the protection triggering speed improves, but the detection voltage proportion becomes mode-dependent requiring additional control logic
Solution Approach 1:
The patent applies preliminary action by having the control unit pre-adjust the detection voltage proportion based on the detected operating mode before over-voltage conditions occur. This proactive adjustment ensures the protection circuit is optimized for the current mode, achieving fast triggering without complex real-time calculations
Solution Approach 2:
The control unit performs multiple functions: it controls the LED module operation and simultaneously manages the over-voltage detection by adjusting the detection voltage proportion. This multi-functionality reduces the need for separate dedicated circuits, thereby limiting the increase in device complexity
Data Source
AI summary
An over-voltage protection circuit for executing an over-voltage protection for a LED module of an electronic device. The over-voltage protection circuit includes a control unit and an over-voltage detection module, a trigger module and an adjustment module. The LED module includes a positive input port. The over-voltage detection module detects a voltage of the positive input port of the LED module and produce a detection voltage proportional to the voltage of the positive input port. The control unit controls the LED module to work or do not work according to the detection voltage. The trigger module produces corresponding trigger signals according to a 2D signal or a 3D signal output by a 2D/3D signal port. The adjustment module adjusts the proportion between the detection voltage and the voltage of the positive input port according to the trigger signal.