Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-06-17
1993-04-20
Stephan, Steven L.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, 318116, H01L 4108
Patent
active
052045765
ABSTRACT:
A device for driving a piezoelectric element comprising a power condenser for charging the piezoelectric element. When the discharging operation of the piezoelectric element is started, the piezoelectric element is initially discharged to the high voltage side terminal of the power condenser via a discharging coil and then discharged to the ground via the discharging coil. When the discharging operation is carried out, the voltage at the terminal of the piezoelectric element drops to a minimum voltage. The start time of the discharge to the ground is controlled so that the minimum voltage becomes equal to a predetermined negative voltage.
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Copending U.S. Patent Application Ser. No. 295296 (filing date: Jan. 10, 1989).
Copending U.S. Patent Application Ser. No. 461236 (filing date: Jan. 5, 1990).
Dougherty Thomas M.
Stephan Steven L.
Toyota Jidosha & Kabushiki Kaisha
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