PE Line Cutoff Circuit for Abnormal Ground Connection Protection

The patent introduces a control circuit as an intermediary between the protection circuit and the charging circuit. This control circuit includes a detection unit that monitors the voltage across the battery terminals to determine when the connected electronic device is fully charged, and a control unit that adjusts the charging current accordingly. This intermediary layer enables the power bank to detect charging status and regulate current without compromising the protection circuit's safety functions.

The patent designs the control circuit to perform multiple functions: it detects the charging status of connected electronic devices, regulates charging current to prevent overcharging, and works cooperatively with the existing protection circuit. By making the control circuit multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby limiting the increase in overall circuit complexity while achieving overcharging prevention.

The patent utilizes the existing voltage signals present in the charging circuit for detection purposes. The detection unit monitors the voltage across the battery terminals, which is already being maintained by the charging circuit's voltage regulation function. By repurposing these existing voltage signals for detection rather than introducing separate active sensing circuits, the patent achieves accurate charging status detection while minimizing additional energy consumption.