Induction Heating System Using Self Oscillating Driver

Abstract

A high frequency induction heating system (IHS) has
been developed for the heating of small quantities of metal for
laboratory and diamond applications. The IHS load forms part of
a resonant circuit whose frequency is determined by the electrical
characteristics of the work-piece placed inside the heating coil. The
dynamic nature of the IHS load is such that it causes a shift in the
natural resonant frequency of the load circuit. Self oscillating driver
(SOD) control for the power sources enable continuous operations
at the resonant frequency of the tank circuit, resulting in a high
conversion efficiency due to dead time switching and maximum
power transfer to the load at all times. This paper describe SOD
control system for the prototype IHS. Some basic design criteria
as well as the actual implementation of the system are presented.
Simulation is obtained for proposed SOD using MATLAB software.
Experimental results are presented to illustrate the effectiveness of
the self oscillating driver (SOD)control system.