Apparatus for controlling position of voice coil motor using voltage/frequency conversion techniques
US10554163B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Sep 27, 2018 |
| Grant date | Feb 4, 2020 |
| Priority date | — |
| Expiry date | Sep 27, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for controlling a position of a voice coil motor (VCM) includes a coil disposed to face a magnetic member provided on one surface of a lens carrier; a driving circuit applying a superimposed current, including a driving current and a position detecting current, to the coil; a filter circuit extracting an alternating current (AC) voltage from a voltage across the coil; a voltage/frequency conversion circuit converting the AC voltage extracted by the filter circuit into a frequency signal; and a digital control circuit detecting positional information of the VCM based on a frequency component of the frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.