Dim mode start for electrodeless lamp ballast
US8836240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2012 |
| Grant date | Sep 16, 2014 |
| Priority date | — |
| Expiry date | Jan 18, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast for energizing a lamp at a lighting level selected from a plurality of lamp lighting levels. The ballast includes a buck converter circuit configured to receive a DC voltage signal having a substantially constant magnitude. The buck converter circuit has a duty cycle for generating a lamp voltage output signal from the DC voltage signal. The lamp voltage output signal has a magnitude that is varied by the duty cycle to energize the lamp at the plurality of lamp lighting levels. A controller is configured to receive a dim input signal indicative of the selected lamp lighting level and to provide a control signal to the buck converter circuit as a function of the dim input signal. The control signal indicates a particular duty cycle corresponding to a lamp voltage output signal having a magnitude for energizing the lamp at the selected lamp lighting level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.