Electric power conversion systems – Current conversion – With means to connect the input to diverse power sources
Patent
1998-12-15
2000-05-30
Han, Y. J.
Electric power conversion systems
Current conversion
With means to connect the input to diverse power sources
363 52, 363 55, H02M 110
Patent
active
06069811&
ABSTRACT:
A DC power supply apparatus includes a rectifier circuit which rectifies an input commercial AC voltage. The rectifier output voltage is smoothed in a smoothing capacitor. The DC voltage from the capacitor is converted to a high-frequency voltage in an inverter. The high-frequency voltage from the inverter is voltage-transformed by a transformer into a voltage-transformed, high-frequency voltage, which is then converted back into a DC voltage in a high-frequency-to-DC converter circuit. When an input commercial AC voltage is applied to the DC power supply apparatus, a pre-charging circuit pre-charges the smoothing capacitor from the input AC voltage. If a voltage having a magnitude larger than a prescribed value is applied to the DC power supply apparatus, an overvoltage protection circuit renders the rectifier circuit and the pre-charging circuit inoperative.
REFERENCES:
patent: 4437133 (1984-03-01), Rueckert
patent: 5272313 (1993-12-01), Karino et al.
patent: 5601741 (1997-02-01), Thommes
Shikata et al.; copending patent application 09/175,830 filed Oct. 20, 1998 entitled "DC Power Supply Apparatus".
Arai Toru
Fujiyoshi Toshikazu
Ikeda Tetsuro
Ishii Hideo
Moriguchi Haruo
Han Y. J.
Murray William H.
Sansha Electric Manufacturing Company Limited
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