Power Supply Abnormality Detection for Buck Output Overvoltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Buck chips in display panel driving circuits can experience unstable duty ratios due to external disturbances, leading to excessively high output power supplies that exceed voltage specifications, potentially causing component damage.
Innovation Solution
A power supply abnormality detection circuit that compares the output power supply with a preset reference, generating a control signal to switch the power supply management module to a power-off state when abnormality is detected, thereby preventing circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the buck chip operates without external disturbance, then the output power supply is stable and within specification, but when disturbed by external environment, the duty ratio becomes unstable and the output power supply becomes too high
Solution Approach 1:
The patent implements a feedback mechanism by comparing the actual output power supply voltage with a preset reference voltage through a comparator. When the output voltage exceeds the reference voltage due to external disturbances, the comparator generates a signal that triggers the power supply management module to adjust or shut down the power supply, thereby maintaining stability and preventing component damage.
Solution Approach 2:
The patent employs preliminary action by establishing a protection mechanism before damage occurs. The comparison module continuously monitors the output power supply voltage and is pre-configured with a reference voltage threshold. When abnormality is detected (output voltage exceeds reference voltage), the system proactively activates the power supply management module to shut down the output, preventing potential component burnout before it happens.
2Reliability
If the output power supply is continuously monitored and abnormality detection is implemented, then circuit damage is prevented, but the device complexity increases due to additional comparison and control modules
Solution Approach 1:
The patent uses a feedback-based protection mechanism where a comparator continuously compares the output voltage with a reference voltage and feeds back the comparison result to the power supply management module. This feedback loop enables automatic abnormality detection and protection without requiring complex control logic, thus maintaining reliability while minimizing additional circuit complexity.
Solution Approach 2:
The protection system is designed to be self-service in nature. The comparison module automatically detects voltage abnormalities by comparing output voltage with reference voltage, and the power supply management module autonomously responds by shutting down the power supply when abnormality is detected. This self-service mechanism eliminates the need for external monitoring or complex control systems, achieving circuit protection with minimal added complexity.
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
This solution reduces the risk of circuit damage, improves safety, and minimizes losses and costs by promptly shutting off the output power supply when abnormal conditions occur.
Implementation Method 1
the comparison module is configured to compare a current output power supply with a preset reference power supply to obtain a first comparison signal
Implementation Method 2
the control module further comprises a first transistor, wherein a first terminal of the first transistor is electrically connected to the first output terminal to receive the first comparison signal
Data Source
AI summary
The present application relates to a power supply abnormality detection circuit and a display terminal, where the circuit includes a power supply conversion module for converting an input power supply into an output power supply; a comparison module for comparing a current output power supply with a preset reference power supply to obtain a first comparison signal; a control module for generating a control signal based on the first comparison signal; and a power supply management module for determining a first operation state corresponding to normality of the output power supply and a second operation state corresponding to abnormality of the output power supply based on the control signal.