Over-voltage Protection Circuit with Time-Range Noise Filtering
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Solution Overview
Problem
Existing over-voltage protection methods often result in false shutdowns due to external noise interference, leading to instability in back-end circuits, as they typically turn off the voltage output immediately once the threshold is exceeded without distinguishing between genuine over-voltage conditions and noise-induced fluctuations.
Innovation Solution
An over-voltage protection method that determines whether the output signal exceeds a preset threshold and, if so, monitors this condition within a specified time range to ensure the voltage remains elevated before triggering a control signal to stop or lower the output, thereby differentiating between genuine over-voltage conditions and noise-induced fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the voltage output is turned off immediately when the output voltage exceeds the threshold voltage, then the response speed is fast, but false shutdown due to noise interference cannot be avoided
Solution Approach 1:
The patent performs a preliminary time-range check before executing the shutdown action. When over-voltage is detected, the system verifies whether the condition persists for a predetermined time period before triggering the shutdown. This preliminary verification maintains fast response to genuine over-voltage while filtering out transient noise, thus resolving the contradiction between response speed and anti-noise capability.
2Reliability
If a time-range verification is added to detect whether the voltage remains above the threshold for a predetermined time, then false shutdown is avoided, but the response time increases
Solution Approach 1:
The patent optimizes the predetermined time period parameter to balance reliability and response time. By carefully selecting the duration of the time-range verification, the system achieves sufficient noise filtering while minimizing the delay in protecting the back-end components. This parameter optimization resolves the contradiction between preventing false shutdown and maintaining fast protection response.
Data Source
AI summary
Embodiments of the present disclosure provide an over-voltage protection method, an over-voltage protection device and a display device. When the voltage value of the output signal is greater than the first preset voltage threshold, it is determined whether the voltage value of the output signal meets the preset over-voltage protection condition. If the voltage value of the output signal is detected to meet the preset over-voltage protection condition, the first control signal is output to stop output of the output signal or lower the voltage value of the output signal.