Device for dimming a beacon light source used in a light based positioning system
US8432438B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2012 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Jun 19, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/195
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one aspect, the present disclosure relates to a dimmable beacon light source for a light based positioning system. In some embodiments, the light source includes a dimmer control switch configured to generate a dimmer signal having a desired light output level, a dimmable driver for controlling the light output of the light source, and a modulator for receiving the dimmer signal from the dimmer control switch, generating a digital pulse recognition signal by controlling the frequency of the dimmer signal to a desired frequency value, and transmitting the digital pulse recognition signal to the dimmable driver to drive the light output of the light source. In some embodiments, the digital pulse recognition signal is a pulse width modulated signal. In some embodiments, the digital pulse recognition signal has a duty cycle based on the dimmer signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.