| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply circuit for a double frequency power supply melting furnace eliminating a possibility of mutual influence of a high frequency inverter output and a low frequency inverter output by the mutually different frequencies in the melting furnace the power of which is supplied in parallel from a double frequency power supply. SOLUTION: A melting furnace the power of which is supplied in parallel from double frequency power supply is structured so as to form at least two or more resonance circuits by connecting a series resonance circuit 4 to start with, a parallel resonance circuit 3 and a series resonance circuit 2 in this order, in the case of a voltage type inverter B, between its output and a melting furnace coil. In addition, it is considered as a variation to form at least two or more resonance circuits by connecting the parallel resonance circuit 3 to start with, the series resonance circuit 4 and a parallel resonance circuit 1 in this order, or to make one high frequency power supply as a power supply using the voltage type inverter B or the current type inverter A, and to make another low frequency power supply as a power supply using the current type inverter A or the voltage type inverter B. |
