Power Voltage Generating Circuit Short Circuit Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display panel drivers and panels can be damaged due to undetected weak signals of short circuits, leading to potential fires or other accidents, as existing power voltage generators fail to sense these weak signals effectively without affecting display quality.
Innovation Solution
A power voltage generating circuit with an input capacitor, inductor, input switching element, control switching element, diode, and output capacitor that monitors voltage drops and current sensing during specific periods to detect short circuits, turning off the input switching element when a reference voltage drop or threshold current is reached, thereby preventing further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power voltage generator continuously monitors the load to detect short circuits, then the reliability of protection is improved, but the device complexity increases due to additional monitoring components and control circuits
Solution Approach 1:
The control switching element serves dual functions: it controls the power voltage output to the gate driver and simultaneously acts as a monitoring point for detecting short circuits in the display panel. By integrating these two functions into a single component, the patent avoids adding separate monitoring components, thus improving reliability while minimizing device complexity.
Solution Approach 2:
The system uses its own control switching element and existing control signals to perform both power delivery and safety monitoring functions. The control switching element's on/off state and the control signals already present in the system are leveraged for detection purposes, eliminating the need for external or additional dedicated monitoring hardware.
2Speed
If the power voltage generator stops providing power immediately upon detecting a short circuit, then the protection speed is improved, but the loss of time occurs during the monitoring period before detection
Solution Approach 1:
The system performs preliminary monitoring of the control switching element's state and control signals during normal operation. By continuously observing these parameters in advance, the system can detect short circuit conditions as soon as they occur, enabling immediate protection response without significant detection delay.
Solution Approach 2:
The system uses feedback from the control switching element's operation state and control signals to continuously monitor for abnormal conditions. This real-time feedback mechanism allows the system to detect short circuits promptly and respond immediately by stopping power voltage output, thus improving protection speed while minimizing detection time.
Data Source
AI summary
A power voltage generating circuit includes an input capacitor including a first end connected to an input node, and a second end connected to a ground, an inductor, an input switching element connected between the input node and a first end of the inductor, a control switching element including a control electrode connected to a switching controller configured to apply a switching control signal, an input electrode connected to a resistor, and an output electrode connected to a second end of the inductor, a diode including a first electrode connected to the second end of the inductor, and a second electrode connected to an output node, and an output capacitor connected between the output node and the ground, wherein the input switching element is configured to be turned off when a short circuit of a load connected to the output node is detected in a monitoring period.