Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-09-23
1999-07-20
Nguyen, Matthew
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363132, H02M 3335
Patent
active
059263814
ABSTRACT:
A DC power supply apparatus includes an input-side rectifier which rectifies an input AC voltage and supplies the rectified voltage to a voltage-boosting converter. The voltage-boosting converter converts the supplied voltage to a voltage of a predetermined magnitude. The predetermined magnitude voltage is, then, converted to a high-frequency voltage by an inverter and applied to a primary winding of a transformer. An output-side rectifier rectifies a high-frequency voltage induced in a secondary winding of the transformer. The inverter includes IGBTs and diodes, which are connected in a full-bridge configuration. A capacitor is connected in parallel with each IGBT. When the IGBTs are rendered conductive by the charging and discharging of the capacitors, no current flows through the IGBTs, and when the IGBTs are rendered nonconductive, the voltages applied to the IGBTs are made to become zero.
REFERENCES:
patent: 5208738 (1993-05-01), Jain
patent: 5272313 (1993-12-01), Karino et al.
patent: 5406051 (1995-04-01), Lai
patent: 5771163 (1998-06-01), Moriguchi et al.
Moriguchi et al.; copending patent application 08/968,054 filed Nov. 12, 1997 entitled "Power Supply Apparatus for Plasma Arc Utilizing Equipment".
Moriguchi et al.; copending patent application 09/152,017 filed Sep. 11, 1998 entitled "Inverter and DC Power Supply Apparatus with Inverter Used Therein".
Shikata et al.; copending patent application 09/175,830 filed Oct. 20, 1998 entitled "DC Power Supply Apparatus".
Arai Toru
Fujiyoshi Toshikazu
Hamada Satoshi
Ishii Hideo
Moriguchi Haruo
Murray William H.
Nguyen Matthew
Sansha Electric Manufacturing Company Limited
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