06184593 is referenced by 161 patents and cites 10 patents.

An electronic circuit, such as a UPS, interfaces a main ac power source and at least one secondary power source to a load. The secondary power source(s) may include one or more auxiliary generators, a flywheel motor generator or microturbine with high speed motor generator, and/or any of a variety of dc storage devices. The electronic circuit includes a dc bus, a first uncontrolled rectifier in combination with a first filter for coupling the main ac power supply to the dc bus, one or more additional uncontrolled rectifier(s) and filter(s) for coupling the auxiliary generator(s) to the dc bus, and a dc-to-ac inverter (between the dc bus and the load) for providing ac output power to the load. The advantages of reduced parts count, increased compatibility between the generator(s) and the electronic circuit, and a simpler method for paralleling many storage and generation devices with a very high power factor to the sources, regardless of the load power factor, are provided.

Title
Uninterruptible power supply
Application Number
9/363530
Publication Number
6184593 (B2)
Application Date
July 29, 1999
Publication Date
February 6, 2001
Inventor
Aaron M Jungreis
Cary
NC, US
Agent
Woodcock Washburn Kurtz Mackiewicz & Norris
US
Assignee
ABB Power T&D Company
NC, US
IPC
H02J 7/14
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