JP2010165696A5 - - Google Patents

Claims (12)

A top plate on which the pan is placed;
A heating coil provided under the top plate for heating the pan;
A drive circuit for converting an alternating voltage into a high frequency voltage and flowing a high frequency current through the heating coil;
A control circuit for controlling the drive circuit;
An electrode provided under the top plate;
A capacitance measuring means for measuring a capacitance between the electrode and a predetermined potential;
With
The induction heating cooker, wherein the control circuit determines that a spill has occurred when a capacitance between the electrode and a predetermined potential changes while driving the heating coil.   The induction heating cooker according to claim 1, wherein the control circuit determines that a spill has occurred based on an increase in capacitance between the electrode and a predetermined potential in a predetermined time.   2. The induction heating cooker according to claim 1, wherein the control circuit determines that boiling over has occurred when a capacitance between the electrode and a predetermined potential increases rapidly. The induction heating cooker according to any one of claims 1 to 3, wherein the control circuit stops the drive circuit when it is determined that a spill has occurred. The control circuit, if it is determined that boiling over has occurred, the induction heating of any one of claims 1 to 3, wherein the controller controls the drive circuit so as to reduce the high-frequency current to be supplied to the heating coil Cooking device. The induction heating cooker according to any one of claims 1 to 5 , wherein a plurality of the electrodes are arranged concentrically on the outside of the heating coil. Claim 6, wherein said control circuit, characterized in that to determine the boiling over when the electrostatic capacitance between the at least one predetermined potential of a plurality of electrodes disposed on the outside of the concentric of the heating coil is increased The induction heating cooker described. The induction heating cooker according to any one of claims 1 to 7 , wherein the control circuit prohibits the determination of boiling over for a predetermined time from the start of driving of the heating coil. A temperature sensor for detecting the temperature of the pan placed through the top plate;
The induction heating cooker according to any one of claims 1 to 8 , wherein when the temperature detected by the temperature sensor is equal to or lower than a predetermined value, the control circuit prohibits the determination of overflowing.   The induction heating cooker according to any one of claims 1 to 9, wherein the electrode is made of a nonmagnetic material.   The capacitance measuring means uses an IC that applies a high-frequency voltage between the plurality of electrodes and a predetermined potential, and measures the capacitance of the plurality of electrodes based on an attenuation level of the applied voltage. The induction heating cooker according to any one of claims 1 to 10.   The induction heating cooker according to any one of claims 1 to 11, wherein the predetermined potential is a ground potential.