Lighting device, luminaire, and control method for the lighting device
US9992837B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2017 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | Dec 2, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device includes: a variable voltage source; a transistor which controls a current flowing through a light-emitting element; and a control circuit which causes the transistor to pass a current corresponding to a received instruction for a dimming level through the light-emitting element. When the received instruction instructs at least a predetermined dimming level, the control circuit causes a voltage drop in the transistor to become a first voltage by controlling the variable voltage source, and when the received instruction instructs a dimming level less than the predetermined dimming level, the control circuit causes the voltage drop to become a second voltage higher than the first voltage, by controlling the variable voltage source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.