Driving apparatus for piezo-actuator having abnormality detecting function
US6384512B1 · kind B1 · utility
17Cited by
1References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 7, 2001 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | Nov 7, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2093
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a driving apparatus for piezo-stacks, a controller repeats switching operation for turning switching elements on/off to thereby attain a determined piezo-actuator voltage. An abnormality detecting circuit determines abnormality of the piezo-stacks by comparing the number of times of charging and the number of times of discharging, or charging/discharging time periods at this occasion with those at normal time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.