Induction cooker design with quasi resonant topology using jitter drive method

Abstract

The principle of induction cooker is based on heating the metallic pan with circulating eddy currents induced by high frequency AC magnetic field. The coil within the induction cooker and the load (pan / pot) acts as a transformer if the load has an electrically conducting base. If the conducting base is ferromagnetic, then the power is transferred with high efficiency. In this document, the quasi resonant topology for induction heating is analyzed. Moreover, pan detection and the method to determine the amount of power delivered to the pan is covered. Jitter method and the three basic benefits of using jitter method during switching action is pointed out. An experimental prototype with a power rating of 2300W is constructed to test the validity of the proposed methods and control algorithms. It was observed that the quasi resonant topology is advantageous over half bridge topology when jitter method is used to drive the semiconductor switches. The test results of the prototype reveal that the current harmonics drawn from the utility is within the limits of the standard EN 61000-3-2.