AC Drive Thermal Control via Inverter Switching Frequency Reduction

The patent applies dynamics by transitioning from a static shutdown threshold to a dynamic temperature management approach. The controller continuously adjusts the switching frequency based on real-time temperature monitoring, allowing the system to adapt its operation to prevent overheating while maintaining continuous operation. This dynamic adjustment resolves the contradiction by protecting devices through active management rather than passive shutdown.

The patent changes the operating parameter of switching frequency in response to temperature conditions. When temperature exceeds the threshold, the controller reduces the switching frequency rather than shutting down the system. This parameter change allows the system to maintain operation at reduced capacity, protecting power switching devices from thermal damage while avoiding complete operational interruption.

The patent applies partial action by reducing the switching frequency only to the extent necessary to control temperature, rather than uniformly reducing all system operations. The controller monitors temperature and adjusts switching frequency proportionally, maintaining optimal efficiency at normal temperatures and applying frequency reduction only when and to the degree that temperature control is required.

The patent implements feedback control where the controller continuously monitors the temperature of power switching devices and uses this information to adjust the switching frequency. This closed-loop feedback system ensures that frequency reduction is applied only when temperature exceeds thresholds, automatically restoring normal frequency when temperatures are acceptable, thereby minimizing efficiency loss while achieving temperature control.