Methods and apparatus for driving a transducer
US10795443B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2018 |
| Grant date | Oct 6, 2020 |
| Priority date | — |
| Expiry date | Dec 3, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B1/045
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Embodiments described herein relate to methods and apparatus for driving a haptic transducer with a driving signal. The method comprises estimating, based on a current through the haptic transducer and a terminal voltage across the haptic transducer, a back electromotive force, EMF, voltage representative of a velocity of a mass in the haptic transducer; comparing a phase of a voltage signal derived from the terminal voltage with a phase of the estimated back EMF voltage; and based on the comparison, adjusting a frequency or a phase of an output signal, wherein the driving signal is derived from the output signal, such that a frequency of the driving signal converges to a resonant frequency of the haptic transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.