Electromagnetic induction cooking apparatus capable of providing

Details Electromagnetic induction cooking apparatus capable of providing Electromagnetic induction cooking apparatus capable of providing

1986-11-25

1988-06-07

Paschall, M. H.

Electric heating

Metal heating

Of cylinders

219 1079, 219 10490, H05G 612

Patent

active

047498366

ABSTRACT:
An electromagnetic induction cooking apparatus having a heating coil, an inverter for supplying an input power to the coil, and a load-identifying circuit. The coil comprises two coils elements. The first coil elements has a first number (N.sub.1) of turns, and the second coil element has a second number (N.sub.2) of turns. The load-identifying circuit identifies the material of a load (e.g., a pan) and selects the first coil element or the second coil element in accordance with the material of the load. When the circuit selects the first coil element, a first DC voltage is applied to the inverter, and the inverter generates and supplies a first high-frequency current of frequency f.sub.1 to the first coil element. When the circuit selects the second coil element, a second DC voltage is applied to the inverter, and the inverter generates and supplies a second high-frequency current of frequency f.sub.2 to the second coil element. The ratio of N.sub.2 to N.sub.1 (N.sub.2 /N.sub.1) is about four to six times the product of the ratio of E.sub.2 to E.sub.1 (E.sub.2 /E.sub.1 ) and the (-1/4)th power of the ratio of f.sub.2 to f.sub.1 (f.sub.2 /f.sub.1).

REFERENCES:
patent: 4115677 (1978-09-01), Yamamura et al.
patent: 4280038 (1981-07-01), Havas et al.
patent: 4464553 (1984-08-01), Ikeda
patent: 4549056 (1985-10-01), Okatsuka et al.
patent: 4595814 (1986-06-01), Ogino et al.

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