Duty cycle brightness control for lighting device
US9713217B2 · kind B2 · utility
4Cited by
22References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2016 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Mar 24, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brightness control circuit for a DC-powered LED light uses a PWM generator. The LED brightness is a function of the duty cycle of a drive signal to a transistor connected in series with the LED. In several embodiments the duty cycle signal generated by the PWM is controlled by at least one momentary SPST switch, or, in one alternative, by first and second SPST switches operable in a make-before-break sequence in a voltage divider circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.