Device for driving a piezoelectric element

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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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.

REFERENCES:
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patent: 4510464 (1985-04-01), Takahashi
patent: 4688536 (1987-08-01), Mitsuyasu
patent: 4732129 (1988-03-01), Takigawa et al.
patent: 4767959 (1988-08-01), Sakakibara et al.
patent: 4966119 (1990-10-01), Mitsuyasu et al.
patent: 5036263 (1991-07-01), Yamada et al.
patent: 5053668 (1991-10-01), Mitsuyasu
patent: 5057734 (1991-10-01), Tsuzuki et al.
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).

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