INDUCTION HEATING DEVICE HAVING IMPROVED TARGET OBJECT DETECTION ACCURACY AND INDUCTION HEATING SYSTEM INCLUDING THE SAME

Disclosed herein is an induction heating device having improved target object detection accuracy and an induction heating system including the same. The induction heating device according to an implementation of this application includes a first working coil unit including first and second working coils connected in parallel to each other, a first inverter unit configured to apply resonant current to at least one of the first and second working coils by performing a switching operation, a first semiconductor switch connected to the first working coil to turn on or off the first working coil, a second semiconductor switch connected to the second working coil to turn on or off the second working coil, and a control unit configured to freely resonate the resonant current by controlling respective operations of the first inverter unit and the first and second semiconductor switches and detect a working coil with a target object located thereon among the first and second working coils based on the number of pulses or a frequency of the freely resonating resonant current.