PIEZOELECTRIC TRANSFORMER WITH HIGH EFFECTIVE ELECTROMECHANICAL COUPLING FACTORS
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United States of America Patent
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Issued Date -
Jun 19, 2014
app pub date -
Aug 3, 2012
filing date -
Aug 9, 2011
priority date (Note) -
Abandoned
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Abstract
The present invention relates to a piezoelectric transformer comprising an elongate piezoelectric ceramic body adapted to operate in fundamental thickness mode. The elongate piezoelectric ceramic body comprises a central input or primary section coupled to adjacently arranged first and second output sections. High power conversion efficiency and zero-voltage switching capability is achieved by providing a primary side effective electromechanical coupling factor keff—P, which is larger than a secondary side electromechanical coupling factor, keff—S.
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