Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1976-06-02
1977-12-27
Hohauser, Herman J.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 87, H02J 900
Patent
active
040656764
ABSTRACT:
A battery backup system for an AC energized DC supply has an AC line monitor for producing a pulse signal having a pulse width dependent on rise time of the AC signal and a frequency dependent on zero line crossings of the AC signal. The pulse signals are checked for frequency and pulse width by being used to control the charging time of a timing capacitor for a timer and to be compared with the pulse width of a predetermined reference pulse, respectively. The occurrence of a defect in the pulse signals stemming from either pulse testing criteria is effective to trigger an SCR circuit into conduction to connect a backup battery to the load devices to replace the DC power formerly being supplied by the AC line. After restoration of the AC power, the backup battery is removed following a fixed time delay to allow the AC powered DC supply to stabilize. A battery charging power supply is connected to the backup battery and is automatically switched between a battery "float-rate" and a "high-rate" charging operation following an AC outage and returned when the charging current indicates that the backup battery is fully charged.
REFERENCES:
patent: 3480791 (1969-11-01), Lesher
patent: 3509357 (1970-04-01), Studtman
Burton Lockwood D.
Halista Mitchell J.
Hohauser Herman J.
Honeywell Inc.
Marhoefer Laurence J.
LandOfFree
Battery backup for AC powered DC supply does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Battery backup for AC powered DC supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Battery backup for AC powered DC supply will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1040524