Abstract
Piezoelectric Transformer based resonant power converters
are an attractive alternative to magnetic power converters in
applications requiring a power level currently less than 100W.
Among the benefits are a power density up to 40W/cm3, a low
profile, reduced radiated EMI and high system efficiency due
to zero voltage switching commutation. The main criteria to
take advantage of these benefits are, despite the fact that a PT
is a piezoelectric capacitor, is optimization the transformer to
behave inductively as a means to avoid excessive hard
switching losses. With this objective, the inverse mathematical
problem has been solved, that directly links wanted electrical
specifications to the mechanical dimensions of a radial mode
piezoelectric transformer. The novel outcome of this study is
that the soft switching ability is directly linked to the ratio
between the active volume of the primary and secondary
sections and independent on all other parameters. Eight
different radial mode PTs has been constructed that verifies
this result in practice. Based on one of these designs the
efficiency for a half-bridge resonant converter operating in
zero-voltage- switching mode has been measured to in-between
93% and 97% depending on the output power.
Original language | English |
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Title of host publication | Applied Power Electronics Conference and Exposition |
Publisher | IEEE |
Publication date | 2011 |
Pages | 498-504 |
ISBN (Print) | 978-1-4244-8083-8 |
Publication status | Published - 2011 |
Event | 2011 26th Annual IEEE Applied Power Electronics Conference and Exposition - Fort Worth, United States Duration: 6 Mar 2011 → 10 Mar 2011 Conference number: 26 https://ieeexplore.ieee.org/xpl/conhome/5740654/proceeding |
Conference
Conference | 2011 26th Annual IEEE Applied Power Electronics Conference and Exposition |
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Number | 26 |
Country/Territory | United States |
City | Fort Worth |
Period | 06/03/2011 → 10/03/2011 |
Internet address |