Apparatus for induction heating 2.5 kW using a series resonant circuit

A device for induction heating of smaller iron components was designed and constructed. The shape of the work coil was matched to horseshoe heating. Required simplicity and robustness of the device excludes the use of water cooled work coil (made of copper tube) which is mainly used in the applications of induction heating. A HF Litz-wire was used in the construction of the work coil in our solution. A non-tradition conception of the input rectifier with a low DC-link capacity is used. This way a sufficiently high power factor can be achieved without any additional PFC circuit. A double acting inverter using a MOS-FET half-bridge is used for exciting the series resonant tank. The system description of the designed induction heater is presented including some important details.