Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1983-07-15
1984-12-11
Pellinen, A. D.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 46, H02J 906
Patent
active
044880570
ABSTRACT:
A power supply for a load such as a computer, which is sensitive to power interruptions. A switching regulator is coupled to both the AC power line and a rechargeable battery, and makes automatic transitions between AC operation and battery operation, utilizing a transistor switch and an energy storage transformer coupled to both power sources and to the load. The transistor switch is driven by a variable duty cycle control signal provided by a programmed current feedback circuit responsive to both output voltage and instantaneous switch current. The feedback circuit cuts off the switch each time the peak current through the switch reaches a value corresponding to the desired output voltage--thus improving control loop stability and maintaining a constant peak current through the switch to substantially eliminate ripple. The circuit enables one terminal of the battery to be connected to one terminal of the switching transistor, to minimize noise. A charging circuit recharges the battery whenever the AC power line is operating within normal limits.
REFERENCES:
patent: 4038559 (1977-07-01), Chun et al.
patent: 4150424 (1979-04-01), Nuechterlein
patent: 4177389 (1979-12-01), Schott
patent: 4238690 (1980-12-01), Clarke
patent: 4389702 (1983-06-01), Clemente et al.
Jennings Derek
Lessler Arthur L.
OPT Industries, Inc.
Pellinen A. D.
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