الفهرس 
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Abstract
Induction heating is a method of electrically heating conducting materials. Heat generated is based on eddy currents induced in the workpiece due to the presence of a varying magnetic field based on Michael Faraday discovery in 1831.This phenomenon has been used in many other fields such transformers, motors, and generators. The idea of efficient induction heating process is benefiting from the resonance property in which a reactive power is nullified. Many obstacles face the idea of resonance control depending on the process of heating, type of magnetic material being heated, and the hardware circuit complexity (parasitical parameters). The idea of tracking resonance frequency has been conventionally tackled by measuring phase shift between output voltage and current and adjusting the frequency to reach zero phase shift. This thesis tackles the resonance tracking of induction heating of ferromagnetic materials. Physical properties dependency on temperature of ferromagnetic material introduces problematic issues, which affects the equivalent inductance of the Induction Heating (IH) system. Each ferromagnetic material has a Curie temperature, which indicates the phase transition from ferromagnetism to paramagnetism. In this work, an estimator is proposed to estimate the equivalent inductance of the system and calculate the required operating frequency to ensure operating at the resonance condition. The proposed estimator mainly depends on the measured output current magnitude and the phase shift between the inverter output voltage and current. The design, analysis and control method are presented and discussed. The proposed estimator is tested and validated using Matlab/Simulink software simulation package. An experimental setup is designed to show the viability of the proposed estimator.