Inverter Trip Control Using Temperature Sensing Circuit

The patent replaces the physical temperature sensing system with a virtual temperature estimation system. Instead of using actual temperature sensors to measure inverter temperature, the system calculates temperature based on electrical parameters (current, voltage, time) and thermal models, thereby reducing hardware complexity while providing sufficient accuracy for trip control decisions.

The patent introduces thermal models and calculation algorithms as intermediaries between electrical parameters and temperature determination. Instead of directly measuring temperature with physical sensors, the system uses electrical measurements (current, voltage, duration) combined with thermal resistance and capacitance models to estimate temperature, avoiding the need for complex temperature sensing hardware while maintaining adequate measurement precision for protection purposes.

The patent implements an automatic reset mechanism where the trip control system continuously monitors temperature and automatically resets the trip state when temperature returns to normal levels. This eliminates the need for manual reset operations while maintaining reliable protection, as the system serves itself by autonomously determining when safe operation can resume based on temperature feedback.

The patent implements a feedback-based trip control system that continuously monitors temperature and compares it against threshold values. The system provides feedback loops where temperature measurements inform trip decisions, and trip status influences continued monitoring. This ensures automatic cancellation only occurs when temperature genuinely returns to safe levels, maintaining both ease of operation and reliability by preventing premature reset while enabling automatic recovery.