Uninterruptible power supplies with dual-sourcing capability and

Details Uninterruptible power supplies with dual-sourcing capability and Uninterruptible power supplies with dual-sourcing capability and

1999-09-22

2000-12-12

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 58, 307 68, H02M 545, H02M 5458

Patent

active

061607223

ABSTRACT:
An uninterruptible power supply (UPS) includes an AC source port configured to connect to an AC power source, a DC source port configured to connect to a DC power source and a load port configured to connect to a load. A rectifier circuit is operative to selectively couple the AC source port to first and second voltage busses through a first inductance. An inverter circuit is operative to selectively couple the load port to the first and second voltage busses through a second inductance. A bidirectional DC source coupling circuit is operative to couple the DC source port to the first and second voltage busses to provide bidirectional power transfer therebetween, preferably such that a voltage at the DC source port is maintained in a substantially fixed proportion to first and second DC voltages at respective ones of the first and second voltage busses. In one embodiment, the bidirectional DC source coupling circuit includes a transformer having first and second inductively coupled windings, the first winding having first and second end taps and a center tap coupled to the neutral bus. A switching circuit is operative to selectively couple the first end tap of the first winding to the first and second voltage busses. A rectifying circuit couples the second end tap of the first winding to the first and second voltage busses. A bidirectional DC-AC converter circuit is coupled between the second winding and the DC source port. Related operating methods are also discussed.

REFERENCES:
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patent: 5111376 (1992-05-01), Mehl
patent: 5229650 (1993-07-01), Kita et al.
patent: 5502630 (1996-03-01), Rokhvarg
patent: 5644483 (1997-07-01), Peng et al.
patent: 5710696 (1998-01-01), Reynolds et al.
patent: 5781422 (1998-07-01), Lavin et al.
patent: 5978236 (1999-11-01), Faberman et al.
patent: 6005362 (1999-12-01), Enjeti et al.
patent: 6014322 (2000-01-01), Higashi et al.

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