Transactions on Engineering and Sciences Design and Implementation of AC-AC ZVS Converter with High Efficiency for Induction Heating

Induction heating is the best method of providing fast, consistent heat for vast selection of manufacturing applications which involve bonding or changing the properties of metals or other electrically-conductive materials. Our project explains the analysis and design of a new AC–AC resonant converter applied to domestic induction heating. The project is based on the half-bridge series resonant inverter topology. The ordinary circuit of an AC-AC converter for induction heating typically includes a controlled rectifier and a frequency controlled current source or a voltage source inverter. It is a well known fact that the input rectifier does not ensure a sine wave input current, and is characterized by a low power .Recently many studies of high power factor rectifiers with a single switch have been made. The working is based on hard switching and only single output frequency is obtained. Output voltage is very low so that current flow through the inductor is very high. It affects the efficiency of the system. The aim of this project is to propose a new topology to improve the efficiency while reducing the number of switching devices. The proposed topology is based on the series resonant half-bridge topology and requires only two rectifier diodes. It can operate with zero-voltage switching conditions during both turn-on and turn-off transitions. As a consequence, the efficiency can be increased and the number of switching device is reduced and also multiple output frequency can be obtained.