Power Supply Overcurrent Cutoff for Display Devices

The overcurrent cutoff unit performs preliminary protection by detecting potential short circuit conditions before they cause damage. The shutdown controller continuously monitors the intermediate terminal voltage and preemptively activates the switching transistor to cut off current flow when abnormal conditions are detected, preventing inductor and switching element damage before it occurs.

The overcurrent cutoff unit acts as an intermediary protective layer between the voltage converter and the intermediate terminal. The switching transistor serves as a mediator that can rapidly insert or remove resistance in the current path, controlling current flow to prevent direct short circuits from causing catastrophic failure of downstream components.

The shutdown controller implements feedback control by continuously monitoring the intermediate terminal voltage and comparing it against expected operating ranges. When the voltage indicates a short circuit condition (abnormally low or zero voltage), the controller activates the switching transistor to cut off current. When normal operating voltage is restored, the feedback loop deactivates the switching transistor, automatically resuming normal operation without manual intervention.

The overcurrent cutoff unit provides dynamic protection by rapidly switching the switching transistor between on and off states based on real-time conditions. This dynamic response allows the system to adapt to changing operational states, cutting off current only when necessary and allowing normal current flow during healthy operation, thus minimizing productivity impact while maintaining reliability.