| 摘要 |
PURPOSE:To automatically change over a heating effective area depending on a size of a pan bottom diameter so as to obtain a predetermined input by sequentially switching respective terminals of a heating coil by a control circuit so that an output of an input current sensing means is a set value as separately determined. CONSTITUTION:A control circuit 22 includes a switching means 21 for switching respective intermediate tap terminals 12, 13 and a desired terminal of respective terminals 10, 12 at the start of winding and at the end of winding and an input current sensing means 15 for sensing an input current value of an inverter circuit 2. Respective terminals of the heating coil 1 are sequentially switched over so that an output of the input current sensing means 15 is a set value as separately determined. Thus automatic switching is possible so that an effective area of the heating coil 1 can be increased/ decreased depending on a size of a pan bottom diameter, and the taps can be sequentially switched over until the input current value coincides with the set value to make the current value approach the set value. |
