Electric heating – Inductive heating – With heat exchange
Patent
1995-05-23
1997-12-23
Leung, Philip H.
Electric heating
Inductive heating
With heat exchange
219665, 219663, H05B 608
Patent
active
057009961
ABSTRACT:
The present invention relates to an induction heating cooker for supplying a predetermined resonant current to a heating coil to thereby carry out a cooking operation, the induction heating cooker including: a rectifying unit for full wave rectifying a commercial alternating current, a zero voltage detecting unit for detecting a zero potential of the commercial alternating current, a control unit for synchronizing with the zero potential of the commercial alternating current detected by the zero voltage detecting unit to thereby control the overall operations of the induction heating cooker, a variable frequency oscillating unit for receiving a control signal generated by the control unit to thereby generate an oscillating frequency, an inverter driving unit for generating a driving signal to thereby drive the switching element according to the oscillating frequency generated by the variable frequency oscillating unit, an inverter for receiving the direct current voltage generated from the rectifying unit according to the driving signal of the inverter driving unit to thereby generate a high frequency wave, a current detecting unit for detecting a current intensity change applied to the heating coil to thereby supply a predetermined intensity of resonant current to the heating coil driven by the inverter, and a comparison unit for comparing an input current intensity change of the heating coil detected by the current detecting unit with a reference current intensity previously established by a load setting unit to thereby generate and send a comparison voltage signal to a variable frequency oscillating unit, so that the oscillating frequency can be varied.
REFERENCES:
patent: 4145592 (1979-03-01), Mizukawa et al.
patent: 4467165 (1984-08-01), Kiuchi et al.
patent: 4540866 (1985-09-01), Okuda
patent: 4764652 (1988-08-01), Lee
patent: 4810847 (1989-03-01), Ito
patent: 4820891 (1989-04-01), Tanaka et al.
patent: 5376775 (1994-12-01), Lee
Lee Hae-Don
Shin Jong-Sub
Leung Philip H.
Samsung Electronics Co,. Ltd.
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