Piezoelectric element drive circuit

Details Piezoelectric element drive circuit Piezoelectric element drive circuit

1989-11-27

1990-08-07

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, H01L 4108

Patent

active

049470744

ABSTRACT:
Disclosed is a piezoelectric element drive circuit which comprises a charge circuit for charging the piezolectric element in response to an external signal, and a switching circuit connected between the terminals of the piezoelectric element via reactor means to allow a current flow in one direction selected in response to an external signal for transferring the charges supplied from the charge circuit and stored in the piezoelectric element from its high-potential side to its low-potential side whereby the piezoelectric element is charged to be in the opposite polarity.
Optionally, the power stored in the piezoelectric element is regenerated at the power source instead of charging the piezoelectric element in the opposite polarity.
With the above drive circuit, the power once supplied to the piezoelectric element from the power source is cyclically used for improved power efficiency.

REFERENCES:
patent: 4109174 (1978-08-01), Hodgson
patent: 4353004 (1982-10-01), Kleinschmidt
patent: 4498089 (1985-02-01), Scardovi
patent: 4595854 (1986-06-01), Yano
patent: 4644212 (1987-02-01), Moritugu et al.
patent: 4688536 (1987-08-01), Mitsuyasu
patent: 4705003 (1987-11-01), Sakakibara et al.
patent: 4732129 (1988-03-01), Takigawa et al.
patent: 4743789 (1988-05-01), Puskas
patent: 4749897 (1988-06-01), Natsume et al.
patent: 4767959 (1988-08-01), Sakakibara et al.

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