Piezo actuator driving circuit

Details Piezo actuator driving circuit Piezo actuator driving circuit

1993-07-29

1995-12-26

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, 310315, H01L 4108

Patent

active

054790620

ABSTRACT:
A driving circuit which drives piezo element connected to a movable member, thereby moving the movable member. A current from a DC power source flows in an induction device. During each drive cycle, a switch mechanism cuts the current in the induction device to induce a driving voltage from the induction device. The switch mechanism cuts the current in the induction device at a first moment in a respective drive cycle occurring when the current is increasing. The driving voltage becomes substantially flat at a second moment during the respective drive cycle occurring after the first moment in the respective drive cycle. A voltage detection device detects the driving voltage induced from the induction device and compares the driving voltage with a predetermined reference level. In accordance with the comparison by the voltage detection device at the second moment during each drive cycle, a control unit determines a first moment for the next drive cycle. More specifically, when the driving voltage is lower than the reference level, the control unit determines the first moment for the next drive cycle to be delayed to cut the current in the induction device at a larger current level. When the driving voltage is larger then the reference level, the control unit determines the first moment for the next drive cycle to be advanced to cut the current in the induction device at a lower current level.

REFERENCES:
patent: 4866326 (1989-09-01), Niikawa et al.
patent: 5204576 (1993-04-01), Misuyasu
patent: 5208505 (1993-05-01), Mitsuyasu
patent: 5214340 (1993-05-01), Suzuki
patent: 5350962 (1994-09-01), Sakaida et al.
patent: 5376854 (1994-12-01), Oouchi

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