Display Power Circuit Short Circuit Protection
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Solution Overview
Problem
Existing display power supply circuits are prone to damage due to accidental short circuits, as they rely solely on monitoring the input voltage and lack effective protection mechanisms to prevent excessive current flow when the output voltage is shorted to ground.
Innovation Solution
A display power circuit with a monitor circuit that compares input and output voltages to detect short circuits, generating a shutdown signal to disable the power switching device when a predetermined threshold is exceeded, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power switching device is configured to deliver full power to the display with the control lead connected to ground, then the power delivery capability is improved, but the device becomes vulnerable to damage from output voltage short circuits
Solution Approach 1:
The monitor circuit continuously compares the output voltage to the input voltage before excessive current can damage the power switching device. By detecting voltage differential changes that indicate a short circuit condition and generating a shutdown signal in advance, the system prevents damage while allowing full power delivery during normal operation
Solution Approach 2:
The monitor circuit establishes a feedback mechanism that continuously monitors the voltage differential between input and output. When the output voltage drops abnormally close to the input voltage (indicating a short circuit), the feedback signal triggers the shutdown of the power switching device, thereby protecting it while maintaining full power capability during normal conditions
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 provides rapid detection and prevention of short circuits, effectively protecting the power switching device from damage by disabling it before excessive current can flow, improving the reliability of display power systems.
Implementation Method 1
A comparator monitors the input voltage and the output voltage to detect a short circuit of a display voltage supplied from the boost circuit, wherein the comparator generates a shut down signal based on a change of the output voltage relative to the input voltage exceeding a predetermined threshold
Data Source
AI summary
A display power circuit is provided. The display power circuit includes a power supply circuit that receives an input voltage and generates an output voltage to power a display. A power switching device couples the output voltage from the power supply circuit to provide a display voltage for the display. A monitor circuit generates a shut down signal based on a change of the output voltage relative to the input voltage exceeding a predetermined threshold indicating a short circuit condition of the display voltage. A control circuit disables the power switching device based on the shut down signal if the short circuit of the display voltage is detected.