Driver circuit for controlling a piezoelectric actuator in charge mode
US6246152A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/483
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A driver circuit for controlling a piezoelectric actuator in a charge mode includes an amplifier having a first input terminal for receiving a control voltage, a second input terminal, and a main final stage with a main output terminal connected to the piezoelectric actuator. The amplifier also includes an additional final stage with an additional output terminal connected to the second input terminal. The main final stage and the additional final stage are connected in parallel with one another so that a current which passes through the main output terminal is proportional in accordance with a predefined factor to a current which passes through the additional output terminal. The driver circuit includes a device having a constant capacitance connected to the second input terminal so that an electrical charge transferred to the piezoelectric actuator is correlated with the control voltage in accordance with the predefined factor and the capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.