Electric power conversion systems – Current conversion – Having plural converters for single conversion
Reexamination Certificate
2005-12-06
2008-03-04
Sterrett, Jeffrey (Department: 2838)
Electric power conversion systems
Current conversion
Having plural converters for single conversion
C363S095000
Reexamination Certificate
active
07339806
ABSTRACT:
A DC-AC inverter has an adjustment device for adjusting wave shape of output thereof includes a feedback circuit, and a zero-crossing detector; the feedback circuit will detect and measure output voltage of the inverter, and feedback-control the inverter to make the inverter output a demanded stable fixed voltage, thus preventing the output voltage of the inverter from changing owing to an input voltage and the loading effect caused by electric appliances connected thereto; the zero-crossing detector is used to detect and measure the frequency and wave shape of the output of the DC-AC inverter therefore the DC-AC inverter can be further connected in parallel to another DC-AC inverter or an utility grid when the feedback circuit is used to feedback-control the inverter for the inverter to provide a demanded stable fixed voltage output.
REFERENCES:
patent: 4439821 (1984-03-01), Grippe
patent: 4862339 (1989-08-01), Inou et al.
patent: 5267138 (1993-11-01), Shores
patent: 7057907 (2006-06-01), Oh
patent: 2003/0197995 (2003-10-01), Hua et al.
patent: 2005/0111242 (2005-05-01), Oh
Rosenberg , Klein & Lee
Sterrett Jeffrey
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