Compact, Efficient Drive Circuit for a Piezoelectric Pump
Lyndon B. Johnson Space Center, Houston, Texas
Tuesday, August 01 2006
Piezoelectric actuators are charged in a time much shorter than the pump cycle.
Figure 1 depicts a switching circuit that drives a piezoelectric pump at a high voltage with a polarity that alternates at the desired mechanical pump frequency. This circuit offers advantages of (1) high energy efficiency relative to conventional direct-drive circuits and (2) compactness relative to conventional resonant drive circuits.
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