Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1994-03-16
1998-03-31
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 66, 307 85, 365229, H02J 700
Patent
active
057342040
ABSTRACT:
A backup apparatus includes a main body power supply for applying a voltage from a main body to loads during a normal operation, a first backup power supply for applying a power supply voltage to a specific load of the loads when a voltage of the main body power supply drops, a second backup power supply for applying a power supply voltage to the specific load when a voltage of the first backup lower supply drops, a first threshold voltage generator for generating a first threshold voltage generated by the first backup power supply, a second threshold voltage generator for generating a second threshold voltage generated by the second backup power supply, a comparator for comparing the first threshold voltage with the second threshold voltage, a first switch circuit for switching the power supply voltage applied to the specific load from the main body power supply to the first backup power supply when the voltage of the main body power supply drops, and a second switch circuit for switching the power supply voltage applied to the specific load from the first backup power supply to the second backup power supply in accordance with a comparison result from the comparator when the voltage of the first backup power supply drops.
REFERENCES:
patent: 4277692 (1981-07-01), Small
patent: 4401895 (1983-08-01), Petkovsek
patent: 4659942 (1987-04-01), Volp
patent: 4673826 (1987-06-01), Masson
patent: 4675539 (1987-06-01), Nichol
patent: 4692145 (1987-09-01), Weyant
patent: 5148042 (1992-09-01), Nakazoe
patent: 5177371 (1993-01-01), Faulk
patent: 5278798 (1994-01-01), Miyawaki
patent: 5300674 (1994-04-01), Shimamoto
Canon Kabushiki Kaisha
Kaplan Jonathan
Shoop Jr. William M.
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