PWM control of vibration motors for mobile electronic devices
US9041321B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2014 |
| Grant date | May 26, 2015 |
| Priority date | — |
| Expiry date | Jun 30, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/032
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved vibration motor controller and method maintains a substantially consistent vibration over time, despite decreasing battery voltage over time, with the controller used in a mobile communication device, the mobile communication device powered by a battery having a maximum charge voltage and a minimum charge voltage, the controller being operative for monitoring the available voltage at the battery; driving the vibration motor using pulse width modulation with a motor voltage which is less than the minimum charge voltage of the battery; and controlling the pulse width modulation used to drive the vibration motor in a manner to provide a substantially consistent power level despite fluctuations in voltage of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.