Dual Power Contactor Switching for Abnormal Supply Conditions

The patent applies preliminary action by pre-configuring multiple exception detection circuits that monitor various power supply parameters (voltage, current, frequency) before exceptions occur. When any exception condition is detected, the system proactively switches from the abnormal power supply circuit to the standby circuit, rather than waiting for complete power failure. This resolves the contradiction by expanding the system's ability to handle diverse exceptions while maintaining reliable power supply through advance preparation and monitoring.

The patent applies segmentation by dividing the exception detection function into multiple independent detection circuits, each monitoring specific parameters (voltage exception detection, current exception detection, frequency exception detection). Each detection circuit independently monitors its parameter and triggers switching when its specific exception condition is met. This modular segmentation allows comprehensive exception coverage while keeping each detection module relatively simple, resolving the contradiction between expanded detection capability and system complexity.

The patent applies merging by integrating multiple exception detection circuits into a unified control architecture where all detection circuits connect to common switching control logic. The control switch and contactors are shared resources that all detection circuits can utilize. This merging approach allows comprehensive exception monitoring through multiple detection circuits while avoiding proportional increase in overall system complexity, as the switching execution mechanism remains unified and coordinated.