CHAPTER ONE
INTRODUCTION AND LITUERATURE SURVEY
1.1 Introduction
Today Induction heating for cooking applications is speedily gaining popularity. Induction cooking technology not only offers the advantage of giving a better efficiency compared to the conventional solutions such as (gas and electric cookers), but also offers the advantages of rapid heating, direct heating, high power density, high reliability, low cost and non-acoustic noise [37].
Michael Faraday, in 1831, coiled two coils of wire onto an iron ring and noted that when an alternating current was passed through one of the coils, a voltage was induced in the other. This experiment represent the birth of electromagnetic induction technology [1].
The basic principle of induction heating, which is an applied form of Faraday’s discovery, is the fact that AC current flowing through a circuit affects the magnetic movement of a secondary circuit located near it. The variation of current inside the primary circuit provided the answer as to how the mysterious current is generated in the near secondary circuit.…show more content… By using this figure the working principle of induction cooker is studied. It can be divide the general steps which happen in induction cooker into some steps starting from AC supply voltage at 50 Hz is applied on the cooker circuit until finish by heating the food as follows. The AC voltage 220v is applied after then rectified to DC and then subsequently back to a high frequency AC source through an inverter. This high frequency current creates a high frequency alternating magnetic field through an induction coil. Therefore, placing a cooking pan below the induction coil will induce eddy current in the pan. As a result of which, heat energy will be produced on the surface of the pan. The internal resistance of the pan causes heat to be dissipated. Thus, it is the pan itself and not the heater that heats up and cooks the food