Electric power conversion systems – Frequency conversion without intermediate conversion to d.c.
Reexamination Certificate
2006-01-31
2006-01-31
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
C363S160000
Reexamination Certificate
active
06992907
ABSTRACT:
The present invention relates a waveform transformation method and apparatus. It uses multilevel transformation module in series, and the output voltages of power modules at all levels are superposed to get the total output voltage, whereas each power transformation module realizes AC-to-AC direct conversion. The deviation between the output′ voltage and setting reference voltage at any time point is made as small as possible by selecting different transformation modules as current working circuit and selecting output voltage waveform of the each different transformation modules. The invention includes outputting n groups of electrical insulating AC and n transfonnation modules connected with AC. The wave transformation method and device of present invention eliminates the intermediate DC stage, so that the circuit is greatly simplified, the cost is reduced obviously and improve working efficiency. It makes voltage and current harmonics to be reduced and obtains higher power factor.
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patent: 6621721 (2003-09-01), York
patent: 1200846 (1998-12-01), None
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Berhane Adolf
Morgan & Finnegan , LLP
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