| 摘要 |
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 (N1) of turns, and the second coil element has a second number (N2) 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 f1 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 f2 to the second coil element. The ratio of N2 to N1 (N2/N1) is about four to six times the product of the ratio of E2 to E1 (E2/E1 ) and the (-1/4)th power of the ratio of f2 to f1 (f2/f1).
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