Uninterruptible power supply (UPS) and method

Details Uninterruptible power supply (UPS) and method Uninterruptible power supply (UPS) and method

1993-07-30

1996-01-09

Shoop, Jr., William M.

Boots, shoes, and leggings

395900, 395750, 364493, 307 64, 307 66, H02J 900

Patent

active

054834635

ABSTRACT:
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.

REFERENCES:
patent: 4475047 (1984-10-01), Ebert
patent: 5104109 (1992-04-01), Kubo
patent: 5176858 (1993-01-01), Tsukabe et al.
patent: 5327355 (1994-07-01), Chiba et al.
"An Adaptive AC Monitoring Algorithm for Microprocessor Controlled Parallel Processing UPSs," H. E. Menkes, AT&T Bell Laboratories, Parsippany, N.J., 1987 IEEE Publication CH2477-8/87/000-0512, IEEE INTELEC 1987 Conference Proceedings.
"Fuzzy and Neutral Network Controller," Yasuhiko Dote, 1990 IEEE Paper No. 087942-600-4/90/1100, pp. 1314-1329 published in IECON, 1990, 16th Annual Conference of IEEE Industrial Electronics Society, Nov. 27-30, 1990, vol. II, Publication No. 90CH2841-5.

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