Overcurrent Protection Circuit With Smooth Peak Current Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing overcurrent protection circuits have high power consumption and cannot restore normal working voltage after an overload is released.
Innovation Solution
The overcurrent protection circuit incorporates a smooth peak current control (SPCC) circuit, including a peak current detector and a peak current controller, to manage current overload and restore normal voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overcurrent protection circuit is directly turned off when overloaded, then the protection function is achieved, but the circuit cannot return to normal work after overload is released
Solution Approach 1:
The circuit transitions from a static off-state to a dynamic recovery process. The capacitor C1 charges during overload and discharges after overload release, automatically controlling the recovery timing. This dynamic behavior enables the circuit to adapt to changing conditions and restore normal operation without manual intervention.
Solution Approach 2:
The capacitor C1 acts as an intermediary element that mediates between the overload detection and the circuit shutdown/recovery process. It stores the overload information and controls the timing of the recovery, enabling smooth transition from protection state back to normal operation.
2Reliability
If the overcurrent protection circuit uses traditional design, then the protection function is provided, but the power consumption is large
Solution Approach 1:
The circuit uses periodic charging and discharging of capacitor C1 to detect overcurrent conditions and trigger protection only when necessary. During normal operation, the circuit consumes minimal power as the capacitor simply charges to the threshold voltage without continuous discharge activity.
Solution Approach 2:
The circuit changes the voltage parameter of capacitor C1 to detect overcurrent conditions. When Vc exceeds Vth, the protection is triggered. This parameter-based detection method is energy-efficient compared to continuous current monitoring.
Data Source
AI summary
Provided are an overcurrent protection circuit and a display device, where the overcurrent protection circuit includes a drive transistor, an operational amplifier, a buffer, a peak current detector, and a peak current controller; the output terminal of the operational amplifier is connected with the buffer, and the operational amplifier controls the drive transistor through the buffer; the output terminal of the peak current controller is electrically connected with the gate control terminal of the buffer; when the peak current detector does not detect an overload current, the peak current detector controls the operational amplifier to control the gate of the drive transistor; when the peak current detector detects an overload current, the peak current detector controls the peak current controller to control the gate of the drive transistor to maintain the overcurrent protection circuit to work.