Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-01-24
2009-12-29
Nguyen, Lamson D (Department: 2861)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S243000
Reexamination Certificate
active
07638992
ABSTRACT:
A drive power control device according to the present invention includes a transistor, which is input with a driving signal before current amplification into a base thereof, and which amplifies a current of the driving signal to drive an actuator; a switching element, which switches an input of a supply voltage to a collector of the transistor between on and off; and a voltage comparator, which compares a base voltage and a collector voltage of the transistor, and which controls the switching element such that the input of the supply voltage to the collector is turned off when a predetermined voltage difference occurs, and the input of the supply voltage to the collector is turned on when a predetermined voltage difference does not occur.
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patent: 5293077 (1994-03-01), Seki et al.
patent: 6501236 (2002-12-01), Smith
patent: 7038433 (2006-05-01), Fan et al.
patent: 2000-218776 (2000-08-01), None
patent: 2002-166580 (2002-06-01), None
Nguyen Lamson D
Seiko Epson Corporation
Sughrue & Mion, PLLC
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