Power supply switch reference circuitry

Details Power supply switch reference circuitry Power supply switch reference circuitry

1995-06-05

1998-05-05

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

307 64, 365229, H02J 100

Patent

active

057478902

ABSTRACT:
An apparatus and method for switching between two power supplies, a primary power supply and a secondary power supply. The present invention generates a first reference voltage using the voltage of the primary power supply and the secondary power supply, wherein the primary power supply voltage is variable. The present invention also generates a second reference voltage based on the voltage of the primary power supply. The first and second reference voltages each have a different slope and the crossing point between these two reference voltages indicate that a switch between the primary power supply and the secondary power supply should occur.

REFERENCES:
patent: 5278798 (1994-01-01), Mijawaki
patent: 5426616 (1995-06-01), Kajigaya et al.
patent: 5541880 (1996-07-01), Campardo et al.

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