INDUCTION HEATING APPARATUS AND INDUCTION HEATING COOKER PROVIDED WITH SAME
First Claim
1. An induction heating apparatus comprising:
- an inverter circuit which includes two switching devices connected in series and outputs an AC signal by driving the two switching devices;
a control portion which drives and controls the two switching devices; and
a plurality of resonant circuits each of which includes a respective resonant capacitor and a respective heating coil and connects to a connecting point between the two switching devices so as to supply constantly the AC signal from the inverter circuit to the plurality of heating coils,whereinthe control portion drives and controls the plurality of switching devices, by using, as an operating range, a frequency range higher than a highest resonance frequency, or a frequency range lower than lowest resonance frequency, out of respective resonance frequencies of the plurality of resonant circuits, andthe respective heating coils in the plurality of resonant circuits are combined to form at least a single induction heating source, whereby an object to be heated is inductively heated by the at least a single induction heating source.
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Accused Products
Abstract
An induction heating apparatus according to the present invention includes: an inverter circuit which outputs an AC signal through ON and OFF operations of a plurality of switching devices; a control portion which drives and controls the plurality of switching devices; and a plurality of resonant circuits which includes respective resonant capacitors and respective heating coils for inductively heating an object to be heated; wherein the switching devices are driven and controlled, by using, as an operating range, a frequency range higher than a highest resonance frequency, or a frequency range lower than lowest resonance frequency, out of respective resonance frequencies of the plurality of resonant circuits, and the respective heating coils in the plurality of resonant circuits are combined to form at least a single induction heating source.
43 Citations
14 Claims
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1. An induction heating apparatus comprising:
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an inverter circuit which includes two switching devices connected in series and outputs an AC signal by driving the two switching devices; a control portion which drives and controls the two switching devices; and a plurality of resonant circuits each of which includes a respective resonant capacitor and a respective heating coil and connects to a connecting point between the two switching devices so as to supply constantly the AC signal from the inverter circuit to the plurality of heating coils, wherein the control portion drives and controls the plurality of switching devices, by using, as an operating range, a frequency range higher than a highest resonance frequency, or a frequency range lower than lowest resonance frequency, out of respective resonance frequencies of the plurality of resonant circuits, and the respective heating coils in the plurality of resonant circuits are combined to form at least a single induction heating source, whereby an object to be heated is inductively heated by the at least a single induction heating source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification
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- Resources
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Current AssigneePanasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
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Original AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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InventorsKurose, Yoichi, Kitaizumi, Takeshi, Ishimaru, Naoaki
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Application NumberUS13/514,566Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current219/620CPC Class CodesH05B 6/062 for cooking plates or the likeH05B 6/44 having more than one coil o...
