Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2011-07-05
2011-07-05
Nguyen, Hai L (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S530000
Reexamination Certificate
active
07973595
ABSTRACT:
A power switch circuit includes a first switch transistor connected to a main power supply, which supplies a first voltage, a second switch transistor connected in series to the first switch transistor and to a backup power supply, which supplies a second voltage. A switch control unit controls activation and deactivation of the first and second switch transistors so that either one of a voltage corresponding to the first voltage and a voltage corresponding to the second voltage is selectively output to a connection node between the first and second transistors. The first switch transistor includes a first diode, which is formed so that a direction from the main power supply toward the connection node defines a forward direction, and a second diode, which is formed so that a direction from the connection node toward the backup power supply defines a forward direction.
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patent: 2008-086100 (2008-04-01), None
Bergere Charles
Freescale Semiconductor Inc.
Nguyen Hai L
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