Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
2006-02-28
2006-02-28
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
C363S097000
Reexamination Certificate
active
07006365
ABSTRACT:
A switching power supply apparatus is provided that is not thermally destroyed even if the load remains short-circuited for a long time when the voltage of the commercially distributed alternating-current power supplied thereto is high. When the load connected between a positive and a negative output terminal is short-circuited, the short-circuited state is detected by an output voltage detection circuit, and a switching control circuit stops operating. At start-up, a current from a bridge rectifier circuit is fed, as a startup current, through a constant current circuit to the switching control circuit. Thus, even when the voltage of the commercially distributed alternating-current power is high, a constant current flows through the switching control circuit. This permits the power consumed with the load short-circuited when the input voltage from the commercially distributed alternating-current power is high to be approximated to that consumed when the input voltage is low.
REFERENCES:
patent: 4156273 (1979-05-01), Sato
patent: 4281378 (1981-07-01), Ogino et al.
patent: 5982649 (1999-11-01), Turner
patent: 6229366 (2001-05-01), Balakirshnan et al.
patent: 9-98574 (1997-04-01), None
patent: 10-304658 (1998-11-01), None
Berhane Adolf
Sharp Kabushiki Kaisha
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