Three-Phase Converter Phase-Loss Switching Without Shutdown

The patent applies dynamics by enabling the converter to dynamically switch between different operating states (normal state, phase loss state, and shutdown state) based on real-time detection of phase loss conditions. The control method allows the system to adapt its operation mode according to the detected phase loss duration and severity, transitioning from a static shutdown approach to a dynamic state-management approach that maintains operation when possible while ensuring safety when necessary.

The patent changes the operational parameters of the converter by adjusting drive signals and control parameters based on the detected phase loss condition. When phase loss is detected, the system modifies operating parameters such as switching frequencies, drive signal patterns, and control loop gains to maintain stable operation in the phase loss state, rather than maintaining fixed parameters that would require shutdown upon any anomaly.

The patent segments the control system into distinct functional modules: a detection unit that identifies phase loss conditions, a state determination unit that evaluates the phase loss duration and severity, and a control unit that generates appropriate drive signals for different operating states. This segmentation allows the complex control logic to be organized into manageable, independent modules that can be implemented and maintained more easily.

The patent creates a universal control method that handles multiple operating scenarios (normal operation, phase loss detection, phase loss state maintenance, and shutdown conditions) through a single integrated control framework. The same control structure and detection mechanism serve multiple functions: detecting phase loss, determining operating state, generating appropriate drive signals, and managing transitions between states, thereby reducing overall system complexity compared to having separate specialized systems for each function.