Resonant Inverter Junction Temperature Estimation at High Switching Frequency

The patent introduces an intermediary calculation approach by using easily measurable voltage and power values as mediators to indirectly obtain the inverted current information. Instead of directly measuring the high-frequency switching current, the system uses voltage sensors and power measurements as intermediaries to derive the necessary current data through calculations involving impedance and power relationships, thereby avoiding the bandwidth limitations of direct current sensors.

The patent replaces the mechanical/electrical measurement system (direct current sensing) with a computational system. Instead of using physical current sensors that cannot handle high switching frequencies, the system substitutes direct measurement with mathematical calculations based on measurable voltage and power parameters, effectively replacing the physical measurement constraint with a computational solution that has no bandwidth limitations.

The patent implements preliminary thermal management by continuously estimating the junction temperature before it reaches dangerous levels. By using the derived current information from voltage and power measurements, the system can predict thermal conditions in advance and take preventive actions such as adjusting switching parameters or activating cooling mechanisms, thereby preventing thermal runaway while maintaining high switching speeds.

The patent establishes a feedback mechanism where the estimated junction temperature and current information are continuously monitored and fed back to the control system. This feedback loop allows the system to dynamically adjust operating parameters to maintain optimal thermal conditions, enabling sustained high-speed switching operations without exceeding temperature limits that would cause failure.