Induction heat cooking device

An induction heat cooking device comprising:

• a top plate made of a material through which an infrared light is transmitted;
• a heating coil for receiving a high frequency current to heat a cooking container placed on the top plate by induction;
• an inverter circuit for providing the high frequency current to the heating coil;
• an operation unit including an operation mode setting unit for setting an operation mode of the inverter circuit;
• an infrared sensor for detecting an infrared light that is emitted from a bottom surface of the cooking container and transmitted through the top plate and outputting a voltage signal variable according to an intensity of the detected infrared light;
• a control unit for controlling an output of the inverter circuit, based on an output of the infrared sensor and a setting inputted to the operation unit;
• and
• a notification unit,
• wherein the operation mode includes a preheating mode for performing preheating before performing heating,
• wherein when the operation mode is set to a preheating mode, the control unit starts operation under the preheating mode for preheating the cooking container with a first heating output corresponding to the preheating mode, and wherein the control unit monitors a voltage difference between the voltage signal outputted from the infrared sensor under the preheating mode and a reference voltage signal outputted from the infrared sensor at a beginning of the preheating mode and, when the monitored voltage difference becomes equal to or larger than a first predetermined threshold value, the control unit causes the notification unit to notify a user that the preheating is finished, and changes the operation mode to a waiting mode for performing heating with a second heating output that is lower than the first heating output.