| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain an induction heating device capable of efficiently heating a heating load by executing optimal drive according to the heating load, and minimizing leakage magnetic flux or enabling low-loss driving. <P>SOLUTION: The heating coils 1, 2 composed of two coils arranged on nearly the same flat surface in nearly a concentric circle shape. A high-frequency power supply is provided with arms 5 to 7 with at least two switching elements connected in series. Among the three arms, the arm 5 is used as a common arm, and each resonant circuit is connected between the switching element of the common arm and the switching element of the other arms 6, 7, respectively. A control circuit 80 can select a method for controlling the magnitude of high-frequency current supplied to the heating coils 1, 2 from the high-frequency power supply part by making different the mutual phase difference of driving control signals supplied to the other arms 6, 7 of the high-frequency power supply in accordance with a setting state by an operation of an operation part 81, and a method of stopping an action of the common arm 5 to form a driving circuit with two coils 1, 2 connected in series at the high-frequency power supply. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
