Driving device for piezoelectric element

Details Driving device for piezoelectric element Driving device for piezoelectric element

1993-03-30

1994-09-27

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

H01L 4109, B41J 230

Patent

active

053509625

ABSTRACT:
A driving device for a piezoelectric element is provided which attains lower power consumption, low heat generation and low cost. To displace a piezoelectric element, a first switching transistor is rendered ON by a control circuit. The electric charges flow in the piezoelectric element from the power supply through the first switching transistor. This state is continued until a sufficient amount of electric charges are stored in the piezoelectric element. To restore the piezoelectric element thus displaced, a second switching transistor is rendered ON under the condition where the first switching transistor is OFF. In this condition, a resonance circuit is formed by the piezoelectric element and the coil. When the electric charges are flowing in the coil and a predetermined period of time has elapsed after the second switching transistor is rendered ON, the control circuit renders the second switching transistor OFF, whereby the current flowing in the coil flows into the power supply.

REFERENCES:
patent: 4529322 (1985-07-01), Ueda
patent: 4595854 (1986-06-01), Yano et al.
patent: 4767959 (1988-08-01), Sakakibara et al.
patent: 4947074 (1990-08-01), Suzuki
patent: 5036263 (1991-07-01), Yamada et al.
patent: 5095256 (1992-03-01), Ueyama et al.
patent: 5214340 (1993-05-01), Suzuki

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