MATLAB-Based Automatic Load Adaptive Frequency Control of a SiC MOSFET-Based Current Fed Inverter for Surface Hardening Simulation

The heating cycle in an induction heating system with a parallel resonant inverter changes both the magnetic and electrical properties of the inductive load, as well as the resonant frequency of the parallel tank circuit. If the resonant system is unable to follow the new resonance frequency, the load's provided power will not reach its full capacity. An automatic frequency tracking system ensures a power factor of one, ensuring energy-efficient performance. This work discusses a closed-loop frequency tracking controller based on a phase-locked loop. using SiC-based technology, Continuous phase difference computation is used to track the frequency.Identifying the exact resonance frequency entails tweaking the frequency until the phase error between voltage and current is almost nil. A MATLAB 2021 simulation demonstrated the efficiency of our automated resonant frequency controller for a SiC MOSFET-based current-fed inverter.The efficiency has improved and the THD percentage has been lowered.