METHOD AND DEVICE FOR DETECTING DC CURRENT OF HIGH-FREQUENCY POWER SUPPLY

• Main Authors: KANO TOSHIYUKI, KURATA IWAO
• Format: Patent
• Language: English
• Published: 07.02.2008
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

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. SOLUTION: A high-frequency power supply HFP1 has: a smoothing capacitor circuit comprising capacitors C11-C1n; a high-frequency power conversion circuit comprising IGBTQ11-Q14, 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. COPYRIGHT: (C)2008,JPO&INPIT