Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-03-13
1994-12-27
Stephan, Steven L.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
340635, H01L 4108, G08B 2100
Patent
active
053768540
ABSTRACT:
A drive circuit for driving a piezoelectric element includes a transformer having a primary winding connected to a power source and a secondary winding connected to the piezoelectric element, a primary semiconductor element circuit connected to the primary winding for switching the current through the primary winding, and a secondary semiconductor element circuit connected to the secondary winding for switching the current through the secondary winding. A failure detection unit responsive to the potential at a predetermined point of the drive circuit is provided for detecting a failure in the piezoelectric apparatus and outputting a failure detection signal.
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Fujitsu Limited
LaBalle C.
Stephan Steven L.
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