Title:
INDUCTION HEATING COOKING UTENSIL
Document Type and Number:
Japanese Patent JP3216564
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the production of a pot interference noises due to a difference in an operating frequency between burners by controlling a conducting ratio to both heating coils in which a peak current value of both electrodes obtained by heating coil current detecting means is within a given range of each coil.
SOLUTION: To a positive side of the side of a DC power source 1 of an induction heating cooking utensil, one end of a heating coil 4 is connected via primary winding of a current transformer 10 constituting heating coil current detecting means, and the other end of the heating coil 4 is connected to a collector of a reversed conductive diode built-in IGBT5 of a first switching element. An emitter of IGBT5 is connected to a negative side of the DC power source 1, and the heating coil 4 and the IGBT5 are connected in series to the DC power source 1. A first resonance capacitor 6 is connected to the IGBT5 in parallel so as to form the heating coil 4 and a resonance circuit, and serial connection between a reversed conductive diode built-in IGBT7 of a second switching element and a second resonance capacitor 8 is connected to the heating coil 4 in parallel.
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Inventors:
Kiyoshi Izaki
Daisho Ogata
Hidekazu Yamashita
Daisho Ogata
Hidekazu Yamashita
Application Number:
JP8498697A
Publication Date:
October 09, 2001
Filing Date:
April 03, 1997
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H05B6/12; (IPC1-7): H05B6/12
Domestic Patent References:
| JP3119682A | ||||
| JP5199768A |
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)