Patent ID: 8796599

Claim:
An induction heat cooking device comprising: a top plate made of a material through which an infrared light is transmitted; a heating coil configured to receive a high frequency current to heat a cooking container placed on the top plate by induction; an inverter circuit configured to provide the high frequency current to the heating coil; an operation unit including an operation mode setting unit configured to set an operation mode of the inverter circuit and a heating power setting unit configured to set a heating power of the inverter circuit, wherein the operation mode includes a preheating heating mode operating at a first power setting for performing preheating before performing heating; an infrared sensor configured to detect an infrared light that is emitted from a bottom surface of the cooking container and transmitted through the top plate; a notification unit, a control unit configured to perform operations comprising: when the operation mode is set to the preheating heating mode, causing the inverter to provide a first heating output to the heating coil; prevent any change to the heating power when a heating power setting different from the first power setting is input by the user via the heating power setting unit while the operation mode is in the preheating mode; determining an incremental output value of the infrared sensor; when the increment output value of the infrared sensor is more than a first predetermined increment value: causing the notification unit to notify a user that the preheating is finished; and causing the operation mode to be changed to a waiting mode in which the inverter outputs a second heating output to the heating coil that is lower than the first heating output, and when the user inputs a heating power setting while the operation mode is in the waiting mode, causing the operation mode to be changed to a heating mode in which the inverter outputs a third heating output to the heating coil corresponding to the heating power setting input by the user while the operation mode is in the waiting mode.