AN INDUCTION HEATING DEVICE HAVING IMPROVED DETECTION ACCURACY ABOUT MATERIAL OF OBJECT TO BE HEATED

摘要

The present invention relates to an induction heating device with improved detection accuracy of a material to be heated. In addition, the induction heating device according to an embodiment of the present invention includes a working coil, first and second switching elements for performing a switching operation, and an inverter unit, an inverter unit and an inverter unit for applying a resonant current to the working coil through a switching operation. The first cut-off is connected between the working coils, and the resonance current applied to the working coil flows in the first cut-off, and it is connected to a current transformer that converts the size of the resonance current flowing in the first cut-off, and is connected to the current transformer to receive a resonant current whose size is converted. A current sensing circuit unit that outputs a first voltage based on the provided resonance current, a voltage sensing circuit unit connected to the inverter unit to receive a switching voltage applied to the second switching element, and to output a second voltage based on the supplied switching voltage, An AND circuit unit that receives first and second voltages from the current sensing circuit unit and the voltage sensing circuit unit, respectively, and outputs a pulse based on the first and second voltages, and a pulse is provided from the AND circuit unit, and the width of the received pulse is determined. It includes a control unit for determining the material of the object to be heated existing on the upper side of the working coil.