Overcurrent Protection Circuit Dynamic Mode Switching

The patent implements dynamic switching between pulse-by-pulse operation and off-latch operation based on the detected overcurrent condition. When a ground fault is detected (coil current exceeds threshold and output voltage drops), the system transitions to off-latch operation to ensure adequate protection. For temporary overcurrents like AC load changes, pulse-by-pulse operation maintains voltage stability. This dynamic adaptation resolves the contradiction by selecting the appropriate protection mode based on real-time system state.

The patent changes the operational parameters of the overcurrent protection circuit based on the detected condition. By monitoring both coil current magnitude and output voltage level, the system adjusts the protection operation mode: using pulse-by-pulse for minor overcurrents and off-latch for severe ground faults. This parameter-based decision-making ensures adequate protection while minimizing unnecessary shutdowns that would affect output voltage stability.

The patent implements dynamic control of the forced OFF period duration based on the type of overcurrent condition detected. For ground faults, the system extends the forced OFF period to ensure adequate protection effectiveness. For temporary overcurrents like AC load changes, the system uses shorter pulse-by-pulse interruptions that maintain productivity. This dynamic adjustment of shutdown duration resolves the contradiction between protection effectiveness and productivity.