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Induction heat cooking device

  • US 9,035,223 B2
  • Filed: 02/19/2009
  • Issued: 05/19/2015
  • Est. Priority Date: 02/19/2008
  • Status: Active Grant
First Claim
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1. 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.

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