Piezoelectric actuator system
US6411009B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2000 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Dec 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/043
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piezoelectric actuator has at least two piezoelectric actuator elements connected in series with each other mechanically and electrically and form a half bridge in an amplifier bridge circuit having a further half bridge formed by two series connected electronic switches which are operated or clocked by a control circuit such as a pulse modulator circuit for periodically energizing the piezoelectric actuators in push-pull fashion. A choke (22) is connected between the junction point (JP1) of the two piezoelectric actuators and the junction point (JP2) between the two electronic switches (23, 24) for assuring a loss free reverse charging of the two piezoelectric actuators functioning as electrical capacitors in the energizing bridge circuit (21). The choke 22 functions as an energy storage and the stored energy is used in the push-pull charging of the capacitors (19, 20) formed by the piezoelectric elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.