The disclosed induction heating cooking device includes a boiling-over detection portion which is adapted to reduce heating output from an inverter to a pre-set value if the amount of change of a capacitance detected by a capacitance detection portion from a reference value (Vo) is equal to or more
The disclosed induction heating cooking device includes a boiling-over detection portion which is adapted to reduce heating output from an inverter to a pre-set value if the amount of change of a capacitance detected by a capacitance detection portion from a reference value (Vo) is equal to or more than an output reduction threshold value (ΔV2), and further is adapted to stop heating, if the amount of change is equal to or more than an output stop threshold value (ΔV3). In this case, the output stop threshold value is provided for each of the plurality of the electrodes, which can absorb impedance variations in the plurality of the electrodes formed through pattern printing using conductive films, thereby uniformizing their sensitivity to boiling over in any directions.
대표청구항▼
1. An induction heating cooking device comprising: a top board on which a heating container is placed;a heating coil, which is provided under the top board and is adapted to inductively heat the heating container;an inverter for supplying a high-frequency electric current to the heating coil;a plura
1. An induction heating cooking device comprising: a top board on which a heating container is placed;a heating coil, which is provided under the top board and is adapted to inductively heat the heating container;an inverter for supplying a high-frequency electric current to the heating coil;a plurality of electrodes provided on a back surface of the top board, around a periphery of the heating coil;a capacitance detection portion adapted to supply a high-frequency signal to the electrodes and to detect a capacitance in each of the electrodes;a storage portion capable of storing the detected capacitance as a reference value;a control portion adapted to perform control such that a heating output from the inverter comes to have a first set value set at start of induction heating; anda boiling-over detection portion that includes a plurality of storage areas that store initial capacitances associated with each of the plurality electrodes, wherein the boiling-over detection portion determines, for each electrode, whether respective differences between the initial capacitance stored in the storage areas that are associated with the plurality of electrodes and a reference value have changed by a first amount of change associated with a given electrode, wherein when the capacitance has changed by the first amount of change associated with the electrode, a boiling-over state is determined, wherein the first amount of change corresponds to a threshold capacitance value and the threshold capacitance value at which a boiling-over state is determined is different for each of the plurality of electrodes;wherein the boiling-over detection portion is adapted to stop a heating operation of the inverter or to reduce the heating output from the inverter to a second set value smaller than the first set value, upon detecting a boiling-over state,wherein the electrodes are provided in a linear shape, along the heating coil around an outer periphery of the heating coil. 2. The induction heating cooking device according to claim 1, wherein the boiling-over detection portion is adapted to: execute reference-value updating processing for storing a newest capacitance as a reference value in the storing portion, when the capacitance detected by the capacitance detection portion has been changed from the reference value by an amount less than a second amount of change; andstop the reference-value updating processing, when the capacitance detected by the capacitance detection portion has been changed from the reference value by an amount equal to or more than the second amount of change. 3. The induction heating cooking device according to claim 2, wherein the boiling-over detection portion is further adapted to reduce the heating output from the inverter to a third set value smaller than the first set value, when the capacitance detected by the capacitance detection portion has been changed from the reference value by an amount equal to or more than a third amount of change which is larger than the second amount of change but is smaller than the first amount of change. 4. The induction heating cooking device according to claim 1, further comprising a manipulation portion provided on the top board, wherein, for any of the electrodes near the manipulation portion, the first amount of change is set to be larger than those for the other electrodes. 5. The induction heating cooking device according to claim 1, wherein the boiling-over detection portion is adapted to change the first amount of change, such that the first amount of change comes to be larger with increasing set output of the heating coil. 6. A method for heating an item comprising: providing an induction heating cooking device that includes: a top board on which a heating container is placed;a heating coil, which is provided under the top board and which is configured to inductively heat the heating container;an inverter for supplying a high-frequency electric current to the heating coil;a plurality of electrodes provided on a back surface of the top board, around a periphery of the heating coil, wherein the electrodes are provided in a linear shape, along the heating coil around an outer periphery of the heating coil;a capacitance detection portion adapted to supply a high-frequency signal to the electrodes and to detect a capacitance in each of the electrodes;a storage portion capable of storing the detected capacitance as a reference value;a control portion adapted to perform control such that a heating output from the inverter comes to have a first set value set at start of induction heating; anda boiling-over detection portionfor each electrode determining, by the boiling-over detection portion, whether a difference between a capacitance of the electrode and a reference value has changed by a first amount of change associated with the electrode;determining that a boiling-over state has occurred when the capacitance has changed by the first amount of change associated with the electrode, wherein the first amount of change corresponds to a threshold capacitance value and the threshold capacitance value at which a boiling-over state is determined is different for each of the plurality of electrodes; anddiscontinuing, by the boiling-over detection portion, a heating operation of the inverter or reducing the heating output from the inverter to a second set value smaller than the first set value, upon determining that a boiling-over state has occurred. 7. The method according to claim 6, further comprising: executing, by the boiling-over detection portion, a reference-value updating process for storing a newest capacitance as a reference value in the storing portion, when the capacitance detected by the capacitance detection portion has changed from reference value by an amount less than a second amount of change; andceasing the reference-value updating processing when the capacitance detected by the capacitance detection portion has changed from the reference value by an amount equal to or more than the second amount of change. 8. The method according to claim 7, further comprising: reducing, by the boiling-over detection portion, the heating output from the inverter to a third set value smaller than the first set value when the capacitance detected by the capacitance detection portion has been changed from the reference value by an amount equal to or more than a third amount of change which is larger than the second amount of change but is smaller than the first amount of change. 9. The method according to claim 6, wherein the induction heating cooking device further comprises a manipulation portion provided on the top board, wherein, for any of the electrodes near the manipulation portion, the first amount of change is set to be larger than those for the other electrodes. 10. The method according to claim 6, further comprising: changing, by the boiling-over detection portion, the first amount of change such that the first amount of change increases with an increasing set output of the heating coil.
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이 특허에 인용된 특허 (3)
Clothier, Brian L., Boil detection method and computer program.
Berkcan Ertugrul ; Saulnier Emilie Thorbjorg ; Wilson Paul Randall ; Badami Vivek Venugopal, Monitoring and control system for monitoring the boil state of contents of a cooking utensil.
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