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
Kevin R Mengelt, Michael J Cane, Mark L Schultz: Backup power system and method. Best Power Technology Incorporated, Foley & Lardner, November 26, 1996: US05579197 (147 worldwide citation)

A backup power system has power supply lines extending from input terminals, connectable to a main AC power system, and output terminals, connectable to a load, with a relay connected in a power supply line. The AC input power is monitored and when a fault in the power is detected, the relay is open ...


3
Douglas C Folts: Method and apparatus for providing battery charging in a backup power system. Best Power Technology Incorporated, Foley & Lardner, April 12, 1994: US05302858 (73 worldwide citation)

A battery in a back-up power system is charged during the time that power is available from the main AC power system by utilizing the main power transformer and the main inverter. When power is available from the main AC power source, an AC voltage appears across the primary of the transformer, whic ...


4
Steven J Paul, Phillip A Board, Michael W Hogan: Method and apparatus for stabilizing AC power supply systems connected to power factor correcting loads. Best Power Technology Incorporated, Foley & Lardner, June 20, 1995: US05426579 (27 worldwide citation)

Instabilities in the output voltage provided from an AC power supply system connected to a power factor correcting load are suppressed by a stabilizer which is connected across the output lines from the power supply system to the load. The stabilizing apparatus includes a rectifier having AC input n ...


5
Kevin R Mengelt: Method and apparatus for efficient phase and frequency coherence locking optimized for digital systems. Best Power Technology Incorporated, Foley & Lardner, December 5, 1995: US05473533 (14 worldwide citation)

Phase and frequency locking of a controlled signal to a reference signal is obtained in a digital phase locked loop using efficient computational procedures which are carried out rapidly with minimal computational burden on a digital processor. During each cycle of the controlled signal, the time di ...