Backup battery switch

Details Backup battery switch Backup battery switch

1996-11-18

1999-03-23

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Converging with plural inputs and single output

307 64, 327 63, 327 99, H03K 1762

Patent

active

058865616

ABSTRACT:
A switching circuit for switching between a main power supply and a battery power supply includes a comparator, a p-channel battery power transfer transistor, a p-channel main power transfer transistor and an inverter. The comparator operates on the main power supply and is connected on input to the main power supply and to the battery power supply. The comparator compares the voltage level of the main power supply with the voltage level of the battery power supply and provides a selection signal which is low when the voltage level of the battery power supply is higher than the voltage level of the main power supply. The p-channel battery power transfer transistor is controlled by the selection signal and transfers the battery supply signal to a switched power supply node. The inverter operates on the battery power supply and inverts the voltage level of the selection signal. The p-channel main power transfer transistor is controlled by the inverter and transfers the main power supply to the switched power supply node.

REFERENCES:
patent: 4617473 (1986-10-01), Bingham
patent: 4730121 (1988-03-01), Lee et al.
patent: 4806789 (1989-02-01), Sakihama et al.
patent: 4908790 (1990-03-01), Little et al.
patent: 5237699 (1993-08-01), Little et al.
patent: 5315549 (1994-05-01), Scherpenberg et al.
patent: 5557229 (1996-09-01), Eitan

Affiliated with

Also associated with

Rating

Backup battery switch does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Backup battery switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backup battery switch will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2130183