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Title: US4395639: Uninterruptible power supply with battery back-up
[ Derwent Title ]


Country: US United States of America

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Inventor: Bring, Karl-Birger; Oskarshamn, Sweden

Assignee: SAB NIFE Aktiebolag, Landskrona, Sweden
other patents from SAB NIFE AB (487725) (approx. 21)
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Published / Filed: 1983-07-26 / 1982-05-06

Application Number: US1982000375568

IPC Code: Advanced: H02J 9/06;
IPC-7: H02J 7/00;

ECLA Code: H02J9/06B;

U.S. Class: Current: 307/066; 320/135;
Original: 307/066; 320/013; 320/021;

Field of Search: 307/066,130 320/009,13,14,21,39,40,50

Priority Number:
1979-10-30  SE1979000009064

Abstract:     A charger in the form of a primary switched rectifier and transformer charges a battery and carries a load when the operating voltage is available to a sufficient extent. When a voltage drop or break in voltage automatically disconnects the battery from the charger, the load is supplied with voltage from the battery. The battery voltage is chopped into square wave form and transformed up via the secondary side of the transformer to the voltage required for the load. A diode is connected between the load and the battery allowing the battery voltage to act directly on the load as long as this voltage is sufficiently high.

Attorney, Agent or Firm: Schaffer, Murray ;

Primary / Asst. Examiners: Pellinen, A. D.; Dwyer, James L.

Maintenance Status: E2 Expired  Check current status

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Related Applications:
Application Number Filed Patent Pub. Date  Title
US1980000198362 1980-10-20       


       
Parent Case:

RELATED APPLICATION
    The present application is a continuation-in-part of Ser. No. 198,362 filed Oct. 20, 1980 now abondened.

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First Claim:
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What is claimed is:     1. A method of uninterruptedly maintaining a current supply to a load normally supplied from a main source comprising the steps of providing a battery, charging said battery via a charger comprising a primary switched rectifier and a charging transformer through which said main source is supplied when the voltage from the main source is available to a sufficient extent to provide on the secondary winding of said charging transformer an operating voltage for said load and a charging voltage for said battery and automatically disconnecting the battery from the charging voltage of the secondary winding upon a voltage drop or voltage interruption from the main source and supplying the load with voltage from the battery, the battery voltage being chopped into square wave form and transformed up via the secondary winding of the charging transformer to the voltage required for the load.

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Forward References: Show 30 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (30)   |   Backward references (2)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 6pp US3952772  1975-12 Miller et al.  Mobil Oil Corporation Intake piece adapted for emptying containers with liquid
Get PDF - 10pp US4087697  1978-05 Johnson  ESB Incorporated Rapid power transfer system
       
Foreign References: None

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