Backup battery power controller having channel regions of transi

Details Backup battery power controller having channel regions of transi Backup battery power controller having channel regions of transi

1993-02-11

1994-08-23

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 66, 3072962, 307355, H02J 902

Patent

active

053410343

ABSTRACT:
A power control circuit (10) is operable to select between a backup battery (14) on a terminal (16) and a primary power supply voltage on a terminal (12) to output a voltage to a powered device (20). The two voltages are compared by a comparator (28) that drives a well bias node (44) with transistors (36) and (38). The comparator (28) selects the highest of two voltages on either the battery supply terminal (16) or the power supply terminal (12) to power the node (44), which node (44) is then connected to the wells of switching transistors (40) and (42) which are operable to select the battery terminals (16) in the event of a fail of the power supply on terminal (12). This decision is made with a power failure device (20). In the event that both the primary power supply voltage falls below a predetermined threshold and the battery supply voltage is at a higher level, the battery (14 ) is selected for output on the line (18).

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