Design and Analysis of Zero Current Switching Resonant Inverter based High Frequency Induction Heating

Abstract

Abstract-This paper deals with design and analysis of Zero Current Switching (ZCS) resonant inverter based high frequency induction heating. The basic circuits consist of a half bridge inverter and an induction heating coil. This equipment works on the principle of eddy current induction. The high frequency current is given to the coil which acts as a primary winding of the transformer. The work piece acts like a short circuited secondary of the transformer. The heating effect is obtained by the eddy current induced in the work piece. Since eddy current is proportional to square of the frequency, heating effect will be high at high frequency. The heat can be varied by varying the frequency. When high frequency in the range of several hundred kHz is used, the switching losses will be more. To reduce the switching losses ZCS soft switching is employed in this work. Simulations are performed in MATLAB to understand the working of ZCS based high frequency induction heating. Also, hardware results are obtained using ZCS IC UC3865N.