Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-04-22
2008-04-22
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S407000
Reexamination Certificate
active
07362161
ABSTRACT:
A power supply switching circuit includes a detection circuit which detects a reduction in a voltage level of the main power supply and outputs a detection signal; a first switch circuit which connects a main power supply to an internal power supply node before a reduction in voltage level is detected and disconnects the main power supply from the internal power supply node when the reduction in voltage level to the predetermined detection level is detected; and a second switch circuit which disconnects the subordinate power supply from the internal power supply node before a reduction in voltage level is detected, connects the subordinate power supply to the internal power supply node from when the reduction in voltage level is detected to when the data backup is completed and subsequently disconnects the subordinate power supply from the internal power supply node when the data backup is completed.
REFERENCES:
patent: 5502682 (1996-03-01), Yoshimura
patent: RE36179 (1999-04-01), Shimoda
patent: 10-243573 (1998-09-01), None
Nixon & Peabody LLP
OKI Electric Industry Co., Ltd.
Studebaker Donald R.
Tra Quan
LandOfFree
Power supply switching circuit, data processing device, and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power supply switching circuit, data processing device, and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply switching circuit, data processing device, and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2749957