| 摘要 |
PROBLEM TO BE SOLVED: To enable induction heating by performing a switching control in the range from low frequency to high frequency driving a pulse transformer as a forced reset method so as to practically use the profitability of a direct drive control method of a pulse transformer. SOLUTION: Switching elements 13 (13a, 13b) in an inverter circuit are made as an IGBT, and a control signal is imputed to the gate of each the IGBT via a pulse transformer 20. A plurality of the inverter circuits are disposed in parallel, and respective pulse transformer 20 is disposed at each inverter circuit. A primary coil for each pulse transformer 20 is connected to one of control circuits, and to one side of the primary coil of the pulse transformer 20 a plus signal a negative signal is inputted to the other side alternately.
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