Title:
POWER CONVERTERS WITH AC AND DC OPERATING MODES AND METHODS OF OPERATION THEREOF
Document Type and Number:
WIPO Patent Application WO2001065659
Kind Code:
A3
Abstract:
A power converter suitable for use in an uninterruptible power supply (UPS) includes first and second voltage busses, an input port having a first terminal coupled to one of the first and second voltage busses, a neutral bus and an output terminal. A first switching circuit selectively couples a second terminal of the input port to the first and second voltage busses. A second switching circuit selectively couples the first and second voltage busses to the output terminal. A third switching circuit selectively couples the first and second voltage busses to the neutral bus. Preferably, the first, second and third switching circuits are operative to produce an AC output voltage at the output terminal from a DC input voltage at the input port such that alternating ones of the first and second terminals of the first input port are referenced to the neutral bus for successive first and second half cycles of the AC output voltage. According to other embodiments, a DC voltage generating circuit is operative to produce respective first and second DC voltages on first and second voltage busses. A first switching circuit is operative to selectively couple the first and second voltage busses to the output terminal. A storage circuit connected to the output terminal includes a capacitive storage element, a rectifying circuit coupling the capacitive storage element to the output terminal, and a second switching circuit operative to selectively couple the capacitive storage element to the output terminal.
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Inventors:
JOHNSON ROBERT W JR
Application Number:
PCT/US2001/005594
Publication Date:
March 14, 2002
Filing Date:
February 22, 2001
Export Citation:
Assignee:
POWERWARE CORP (US)
International Classes:
H02J9/06; H02M1/10; H02M7/538; (IPC1-7): H02J9/06; H02M5/458
Domestic Patent References:
| WO1994023482A1 | 1994-10-13 |
Foreign References:
| US5126585A | 1992-06-30 | |||
| US5253157A | 1993-10-12 | |||
| US5463283A | 1995-10-31 | |||
| US5610805A | 1997-03-11 | |||
| EP0420628A2 | 1991-04-03 | |||
| US5119283A | 1992-06-02 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 08 30 June 1998 (1998-06-30)
PATENT ABSTRACTS OF JAPAN vol. 018, no. 023 (M - 1541) 14 January 1994 (1994-01-14)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30)
PATENT ABSTRACTS OF JAPAN vol. 018, no. 023 (M - 1541) 14 January 1994 (1994-01-14)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30)
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