1
Frederick A Stich, Thomas G Hubert, David L Layden, Donald K Zahrte: Uninterruptible power system. Best Power Technology Incorporated, Foley & Lardner, February 11, 1997: US05602462 (281 worldwide citation)

An uninterruptible power system has a transformer with a primary connected to input terminals, a secondary connected to output terminals, a static switch connected between the input terminals and the primary, and an auxiliary primary connected to an inverter which is supplied by a battery to provide ...


2
Frederick A Stich, Edward G Beistle: Method and apparatus for determination of battery run-time in uninterruptible power system. Best Power Technology Corporation, Foley & Lardner, March 15, 1994: US05295078 (167 worldwide citation)

The run-time on battery power available from an uninterruptible power system is accurately determined both during supply of power from the battery through an inverter to the load and during the time where power is supplied directly from an AC power system to the load. During power outages where powe ...


3
Frederick A Stich, Donald K Zahrte Sr, Richard V Baxter Jr, Douglas C Folts, Thomas G Hubert, Juan M Medina, William J Hazen, Edward G Beistle: Back-up uninterruptible power system. Best Power Technology, Foley & Lardner, May 24, 1994: US05315533 (150 worldwide citation)

A back-up uninterruptible power system has a power supply path from input terminals connected to AC power system lines to normally supply power to a load. Upon the occurrence of a line fault, a static switch in the power supply path interrupts the connection between the AC power lines and the load a ...


4
Yang Hwa, Yang Ren Tzung: Internal card type uninterruptible power system. Mitac International, June 9, 1993: GB2262170-A (133 worldwide citation)

An internal card type uninterruptible power system 7 is to be used in combination with a computer 2 that is normally operated by line power. The system 7 includes a battery pack 9 which is charged when the line power is available and which is actuated to supply power to the computer 2 when the line ...


5
Vytautas F Janonis, Roland K Massatti, Regis E Novitskey: Uninterruptible power system. Northrop Grumman Corporation, Philip A Florenzo, March 18, 1997: US05612580 (115 worldwide citation)

An uninterruptible power supply for providing continuous power from a power source line to a load is provided. In particular, the uninterruptible power supply may either operate in an "Off-Line" mode or one of two "On-Line" modes. The uninterruptible power supply operates in the "Off-Line" mode when ...


6
Cary Winch, David Layden, Craig Edevold: Modular method and apparatus for building an uninterruptible power system (UPS). Powerware Corporation, Leydig Voit & Mayer, October 30, 2001: US06310783 (98 worldwide citation)

An electrical cabinet or chassis for an uninterruptible power system (UPS system) includes universal bays or slots that can receive either power modules or battery backs. The back plane of the slot has separate connector terminals for battery packs and power modules. The slots may also receive batte ...


7
Richard N Bowyer, Geoffrey West: Uninterruptible power system with a flywheel-driven source of standby power. Atlas Energy Systems, Baker Maxham Jester & Meador, July 8, 1997: US05646458 (87 worldwide citation)

An UPS (uninterruptible power system) includes an UPS power conditioning unit that provides conditioned AC power to a critical load. The UPS power conditioning unit includes a variable speed drive that operates in response to AC utility power or to a standby DC input by providing a motor drive signa ...


8
Carlos F Gottfried: Uninterruptible power system. Power Group International, Dula Shields & Egbert, July 17, 1984: US04460834 (74 worldwide citation)

The present device is power system for providing an uninterruptible power supply to an external load comprising a flywheel generator, a first motor, a standby generator, and a transfer controller. The flywheel generator is adapted to supply energy to the external load. The first motor is drivingly c ...


9
Robert E Hull, Robert S Gemp: Load balancing system for ups rectifiers. Westinghouse Electric, C M Lorin, September 12, 1978: US04114048 (68 worldwide citation)

In order to maintain a balanced load between power rectifiers operating in parallel within an uninterruptible power system, individual closed loops are established for regulating the direct current voltage at the output of the rectifiers and an open loop generates a reference voltage for each of suc ...


10
Randhir S Malik: Secondary power supply for an uninterruptible power system. International Business Machines Corporation, Bernard D Bogdon, Andrew Dillon, December 5, 2000: US06157168 (61 worldwide citation)

A secondary power supply with a battery charging circuit for use with a primary power supply having an AC power relay coupled to a AC power source and a DC/DC power converter is disclosed. The secondary power supply includes a battery bank having positive and negative terminals, wherein the negative ...