Transformerless power conversion circuit for grid-connected...

Details Transformerless power conversion circuit for grid-connected... Transformerless power conversion circuit for grid-connected...

2005-12-29

2008-10-21

Sterrett, Jeffrey L. (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C323S222000, C323S266000, C363S098000

Reexamination Certificate

active

07440300

ABSTRACT:
A transformerless power conversion circuit is interconnected with an electric grid and converts an input DC power provided by a power generator into an AC power and feeding the AC power into the grid. The power conversion circuit includes a buck-boost converter converting the input DC power into two sets of DC power levels; and at least one half-bridge inverter converting the two sets of DC power levels into the AC power for feeding into the grid. The isolating transformer can be eliminated and the common ground problem for DC side and AC side is also solved. The power conversion circuit has significant improvement for device size, manufacture cost and conversion efficiency.

REFERENCES:
patent: 5592371 (1997-01-01), Rajashekara et al.
patent: 5654591 (1997-08-01), Mabboux et al.
patent: 6281595 (2001-08-01), Sinha et al.
patent: 6933626 (2005-08-01), Oughton, Jr.
patent: 6961250 (2005-11-01), Lin et al.
patent: 7276886 (2007-10-01), Kinder et al.
patent: 7333349 (2008-02-01), Chang et al.
patent: 2004/0165408 (2004-08-01), West et al.

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