05483463 is referenced by 31 patents and cites 4 patents.

A UPS having a ferroresonant transformer is selectively switched from AC line voltage to an inverter by a control method and apparatus using fuzzy logic to select an optimum switching point. The control apparatus and method senses output load current, output voltage and input voltage. Output current is used to calculate output load as a percentage of full load. First membership functions relating to percent load, second membership functions relating to output voltage, third membership functions relating to input voltage switching points, and rules using percent load membership and output voltage membership as antecedents and values of input voltage switching points as consquents as determined by regulation characteristics of the ferroresonant transformer, are used to execute a fuzzy inference and generate dynamic input voltage switching points for comparison with line input voltage to control switching of the UPS between line and inverter sources.

Title
Uninterruptible power supply (UPS) and method
Application Number
8/100111
Publication Number
5483463
Application Date
July 30, 1993
Publication Date
January 9, 1996
Inventor
Shanshan Du
Troy
MI, US
Yu Qin
Troy
MI, US
Agent
Barnes Kisselle Raisch Choate Whitemore & Hulbert
Assignee
Controlled Power Company
MI, US
IPC
H02J 9/00
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