Control method and apparatus for extending runtime on a portable lighting device
US10412805B1 · kind B1 · utility
2Cited by
13References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2018 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | May 16, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting apparatus is provided including a lighting unit arranged to emit light; a switching device disposed between a power source and the lighting unit; and a controller configured to set a drive signal based on a target luminance level of the lighting unit and control a switching operation of the switching device via a drive signal to regulate a supply of electric power from the power source to the lighting unit. The controller monitors a voltage of the power source and periodically adjusts the drive signal based on the voltage of the power source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.