Load applicability detecting device for induction-heating cookin

Details Load applicability detecting device for induction-heating cookin Load applicability detecting device for induction-heating cookin

1988-02-11

1989-03-07

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 10493, 323901, 363 49, H05B 606

Patent

active

048108472

ABSTRACT:
A load applicability detecting device for induction-heating cooking apparatus includes a heating coil for an heating metallic cooking pans by means of electromagnetic induction, an inverter supplying the heating coil with high frequency currents, a soft starter for gradually decreasing an output frequency of the inverter at the time of the starting of the inverter, an input current detector for detecting the inverter input current at an initial stage of the starting of the inverter to obtain a detection signal, a reference signal generator for generating a reference signal in synchronization with the starting of the inverter, the level of the reference signal being varied with a predetermined time constant, and a comparator for comparing a detection signal generated by the input current detector with the reference signal generated by the reference signal generator to produce a load applicability detection signal in accordance with the difference between the levels of the detection signal and the reference signal.

REFERENCES:
patent: 3781505 (1973-12-01), Steigerwald
patent: 4180852 (1979-12-01), Koizumi et al.
patent: 4317016 (1982-02-01), Ito
patent: 4338503 (1982-07-01), Ito et al.
patent: 4356371 (1982-10-01), Kiuchi et al.
patent: 4467165 (1984-08-01), Kiuchi et al.
patent: 4599504 (1986-07-01), Ito
patent: 4617442 (1986-10-01), Okuda
patent: 4625271 (1986-11-01), Chetty et al.
patent: 4686340 (1987-08-01), Fukasawa

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