Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-05-08
2007-05-08
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S539000, C327S540000, C327S541000, C327S542000, C323S312000, C323S313000, C323S314000
Reexamination Certificate
active
10902957
ABSTRACT:
A constant voltage circuit is disclosed that includes an output control transistor and an overcurrent protection circuit. The overcurrent protection circuit includes a proportional current generation circuit part, a current division circuit part, a division ratio control circuit part, a current-voltage conversion circuit part, and an output current control circuit part. When the output voltage of the current-voltage conversion circuit part reaches a predetermined voltage, the output current control circuit part prevents an increase in the output current of the output control transistor so as to reduce a voltage output from an output terminal. When the voltage output from the output terminal is reduced to a predetermined limit voltage, the division ratio control circuit part changes the division ratio of the current division circuit part so that a current supplied to the current-voltage conversion circuit part increases so as to reduce the output current of the output control transistor.
REFERENCES:
patent: 5444595 (1995-08-01), Ishikawa et al.
patent: 5642252 (1997-06-01), Sakamoto et al.
patent: 6429631 (2002-08-01), Inaba et al.
patent: 6879501 (2005-04-01), Mori
patent: 7049879 (2006-05-01), Osamura et al.
patent: 7-46291 (1995-05-01), None
Agari Hideki
Nagata Toshihisa
Yoshii Kohji
Dickstein & Shapiro LLP
Lam Tuan T.
Nguyen Hiep
Ricoh & Company, Ltd.
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