US4658155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive circuit for a piezoelectric actuator
Assignee: Omron Corp
•
Filing: 1986-04-21
•
Granted: 1987-04-14
•
Expires: 2006-04-21
Abstract
Abstract A drive circuit for a piezoelectric actuator includes a pair of power input terminals for supplying either AC or DC power, with the piezoelectric actuator being connected between these power input terminals. A device for supplying current for driving the piezoelectric actuator in one direction is interposed between one of the power input terminals and an end of the piezoelectric actuator. Further, there is provided connected in parallel to the piezoelectric actuator a switching circuit which turns into a high resistance state when the device is on and serves as an active discharge path for the electric charges of the piezoelectric actuator.
Inventors
- 👤 Masatoshi Ohba
- 👤 Ryuichi Sato
- 👤 Tsutomu Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:23
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/802; H10N30/20; H10N30/204
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A drive circuit used for driving a piezoelectric actuator, comprising: a pair of power input terminals for receiving any one of AC or DC power; a piezoelectric actuator connected between the power input terminals; means for supplying current for driving the piezoelectric actuator in one direction interposed between one of the power input terminals and an end of the piezoelectric actuator; switching means having a high resistance state when switched on and serving as an active discharge path for the electric charges of the piezoelectric actuator when said drive circuit is switched off, and switching means being connected in parallel to the piezoelectric actuator and; discharge prohibiting means for maintaining said switching means in the high resistance state when said pair of input terminals receives any one of AC or DC power.
Claim 2
Dependent Claim
132 words
A drive circuit used for driving a piezoelectric actuator, comprising: a pair of power input terminals for receiving any one of AC or DC power; a piezoelectric actuator connected between the power input terminals; means for supplying current for driving the piezoelectric actuator in one direction interposed between one of the power input terminals and an end of the piezoelectric actuator; switching means having a high resistance state when switched on and serving as an active discharge path for the electric charges of the piezoelectric actuator when said drive circuit is switched off, and switching means being connected in parallel to the piezoelectric actuator and; discharge prohibiting means for maintaining said switching means in the high resistance state when said pair of input terminals receives any one of AC or DC power.
Claim 3
Dependent Claim
22 words
A drive circuit for a piezoelectric actuator according to claim 1, wherein said current supplying means comprises a half wave rectifying circuit.
Claim 4
Dependent Claim
50 words
A drive circuit for a piezoelectric actuator according to claim 1, wherein AC power is supplied and said switching means assumes a high resistance state with respect to the piezoelectric actuator during the period of one of the half cycles of the AC input including the period near zero crossing.
Claim 5
Dependent Claim
144 words
A drive circuit for a piezoelectric actuator according to claim 1, wherein said switching means comprises: a capacitor which is shortcircuited during the period in which the piezoelectric actuator is charged and driven, and is charged by the voltage across the piezoelectric actuator when the charging and the driving of the piezoelectric actuator have ceased; and a switching device which turns into a high resistance state with respect to the piezoelectric actuator by being turned off during the period in which the piezoelectric actuator is charged and driven and rapidly discharges the charged electric charges of the piezoelectric actuator by being turned on by the voltage across the capacitor when the charging and driving of the piezoelectric actuator has ceased; and said discharge prohibiting means comprises a diode which turns off the switching device during one of the half cycles of the AC input.
References Cited (Backward Citations)
US3679918A
Cited
US3683210A
Cited
US3743868A
Cited
US3989042A
Cited
US4044297A
Cited
US4093883A
Cited
US4054936A
Cited
US4065096A
Cited
US4318062A
Cited
US4376255A
Cited
US4395651A
Cited
US4431975A
Cited
US4409638A
Cited
US4520289A
Cited
US4568849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |