Induction heating cooker and method for operating the same

Details Induction heating cooker and method for operating the same Induction heating cooker and method for operating the same

2005-08-30

2005-08-30

Leung, Philip H. (Department: 3742)

Electric heating

Inductive heating

With heat exchange

C219S625000, C219S663000, C219S649000

Reexamination Certificate

active

06936799

ABSTRACT:
An induction heating cooker capable of accurately discriminating whether the material of a cooking container placed in the induction heating cooker is magnetic or non-magnetic, using a phase change in a resonant capacitor voltage of an inverter circuit and a switching pulse signal of the inverter circuit, irrespective of the load of the cooking container, and a method for operating the induction heating cooker. The induction heating cooker includes a power supply for rectifying an AC voltage, filtering the rectified voltage, and supplying the filtered voltage as an input voltage of the induction heating cooker, an inverter circuit for heating a cooking container placed in the induction heating cooker, using the voltage supplied from the power supply, and a container material discriminating unit for discriminating whether a material of the cooking container is magnetic or non-magnetic, based on a resonant capacitor voltage of the inverter circuit and a switching pulse signal of the inverter circuit, upon an initial operation of the induction heating cooker, whereby the cooking container is selectively heated in accordance with the result of the discrimination.

REFERENCES:
patent: 3775577 (1973-11-01), Peters, Jr.
patent: 5648008 (1997-07-01), Barritt et al.
patent: 6153863 (2000-11-01), Snowball
patent: 6812440 (2004-11-01), Hirota et al.
patent: 1 347 669 (2003-09-01), None
patent: 03-114196 (1991-05-01), None

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