Electricity: power supply or regulation systems – Output level responsive – Using a transformer or inductor as the final control device
Patent
1995-02-21
1997-02-11
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a transformer or inductor as the final control device
307 64, 307 66, 363101, 320 48, 323259, G05F 116, H02J 700, H02J 900
Patent
active
056024622
ABSTRACT:
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 output voltage to the output terminals when a main AC power system connected to the input terminals has failed. The primary has multiple taps at different voltage levels and a buck-boost winding. The taps of the transformer are switched and the buck-boost winding is controlled to provide either buck, boost, or pass-by to allow control of the output voltage from the transformer to within a few percent of a desired voltage level despite large changes in the input voltage. A battery charger coupled to the auxiliary primary operates as a boost converter to provide current to charge the battery at a current level which tracks the input voltage from the AC power system, thereby providing a substantially unity power factor to the AC power system. The voltage control of the output voltage also controls the voltage at the output of the auxiliary primary to which the battery charger is connected, whereby the voltage applied to the charger is substantially regulated and the output power of the charger itself is substantially regulated. The charger can be operated in programmable modes to provide a desired charge configuration for the battery. Detection of faults in the AC power system is enhanced by accurate detection of the zero crossings of the input voltage from the AC power system, and by comparison of the AC input power waveform with an adaptive reference.
REFERENCES:
patent: 2417754 (1947-03-01), Hibbard
patent: 3445753 (1969-05-01), Maxwell
patent: 3614595 (1971-10-01), Paulden
patent: 3688177 (1972-08-01), Reeves et al.
patent: 3854082 (1974-12-01), Nasby et al.
patent: 3887858 (1975-06-01), Burkett et al.
patent: 4031463 (1977-06-01), Norberg
patent: 4096394 (1978-06-01), Ullman et al.
patent: 4207513 (1980-06-01), Hess, Jr.
patent: 4277692 (1981-07-01), Small
patent: 4366389 (1982-12-01), Hussey
patent: 4388534 (1983-06-01), Love et al.
patent: 4400624 (1983-08-01), Ebert, Jr.
patent: 4400625 (1983-08-01), Hussey
patent: 4467265 (1984-08-01), Hieholzer, Jr.
patent: 4472672 (1984-09-01), Pacholok
patent: 4473756 (1984-09-01), Brigden et al.
patent: 4488057 (1984-12-01), Clarke
patent: 4516035 (1985-05-01), Rhoads et al.
patent: 4549127 (1985-10-01), Taylor et al.
patent: 4549254 (1995-10-01), Kissel
patent: 4584514 (1986-04-01), Kaminski
patent: 4591779 (1986-05-01), Carpenter, Jr. et al.
patent: 4604530 (1986-08-01), Shibuya
patent: 4641042 (1987-02-01), Miyazawa
patent: 4673825 (1987-06-01), Raddi et al.
patent: 4692686 (1987-09-01), Thomas
patent: 4692854 (1987-09-01), Baxter, Jr. et al.
patent: 4694402 (1987-09-01), McEachern et al.
patent: 4695784 (1977-09-01), Reynolds
patent: 4713553 (1987-12-01), Townsend et al.
patent: 4716357 (1987-12-01), Cooper
patent: 4748341 (1988-05-01), Gupta
patent: 4763013 (1988-08-01), Gvoth, Jr. et al.
patent: 4763014 (1988-08-01), Model et al.
patent: 4782241 (1988-11-01), Baker et al.
patent: 4797936 (1989-01-01), Nakatsugawa et al.
patent: 4814934 (1989-03-01), Jones et al.
patent: 4843299 (1989-06-01), Hutchings
patent: 4860185 (1989-08-01), Brewer et al.
patent: 4890005 (1989-12-01), Schornack
patent: 4916329 (1990-04-01), Dang et al.
patent: 4920475 (1990-04-01), Rippel
patent: 4956563 (1990-09-01), Schornack
patent: 5019717 (1991-05-01), McCurrey et al.
patent: 5055703 (1991-10-01), Schornack
patent: 5166595 (1992-11-01), Leverich
patent: 5182518 (1993-01-01), Stich et al.
patent: 5184025 (1993-02-01), McCurrey et al.
patent: 5229650 (1993-07-01), Kita et al.
patent: 5229651 (1993-07-01), Baxter, Jr. et al.
patent: 5295078 (1994-03-01), Stich et al.
patent: 5315533 (1994-05-01), Stich et al.
patent: 5440179 (1995-08-01), Severinsky
patent: 5465011 (1995-11-01), Miller et al.
patent: 5532523 (1996-07-01), Tang
Reid, et al., "A New Concept: Intermittent Charging of Lead Acid Batteries in Telecommunication Systems", IEEE, pp. 67-71, May, 1984.
Deltec Corp., Advertisement, "A More Profitable Approach to LAN Protection", Varbusiness, Jun., 1994.
Heart Interface Corp., Press Release, "Regulator Allows Charging From Alternator", The Battery Man, pp. 31-32, Apr., 1995.
David O. Feder & Gino Carosella, "The Never-Ending Pursuit of Float Voltage Uniformity in Stationary Reserve Battery Plants", Power Quality Assurance, pp. 42-55, Jan./Feb. 1995.
Hubert Thomas G.
Layden David L.
Stich Frederick A.
Zahrte Donald K.
Berhane Adolf
Best Power Technology, Incorporated
Wong Peter S.
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