| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the price of a high-frequency power supply suitable for feeding power to a high-frequency induction heating apparatus for composing a resonance circuit. <P>SOLUTION: A high-frequency power supply HFP1 has: a smoothing capacitor circuit comprising capacitors C<SB>11</SB>-C<SB>1n</SB>; a high-frequency power conversion circuit comprising IGBTQ<SB>11</SB>-Q<SB>14</SB>, or the like; a control circuit 11; an AC current detector 12; a current computer 14; an AC voltage detector 15; and an AC current detector 16. In the current computer 14, a current Idc* equivalent to a current Idc is obtained from a DC power supply for feeding DC power to the high-frequency power supply from an output current Io of the high-frequency power conversion circuit detected by the AC current detector 12, and a current Ic of the smoothing capacitor circuit detected by the AC current detector 16, based on an output voltage Vo of the high-frequency power conversion circuit. <P>COPYRIGHT: (C)2008,JPO&INPIT |
