Method for operating a piezoelectric speaker
US10820091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2019 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Feb 27, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/802
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for operating a piezoelectric speaker for generating sound waves in the audible wavelength spectrum and/or in the ultrasonic range includes at least partially charging a piezo actuator of the piezoelectric speaker with electrical energy of an energy unit and then at least partially discharging the piezo actuator. The method also includes determining at least one present electrical piezo actuator voltage of the piezo actuator. A future input voltage for the piezo actuator is compared with the present electrical piezo actuator voltage prior to charging and/or discharging, and a future differential voltage is derived therefrom. Furthermore, an embodiment of the method can include returning a part of the energy needed to charge the piezo actuator to the energy unit during discharging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.