Single switch electronic dimming ballast
US6784622B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Dec 5, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast for driving at least one gas discharge lamp from a source of AC power which has a substantially sinusoidal line voltage at a given line frequency includes a rectifying circuit; a valley fill circuit; and an inverter circuit connectable to the at least one gas discharge lamp; The inverter circuit has a single controllably conductive device and an inductor; the inductor connectable to the at least one gas discharge lamp; the inverter circuit being adapted to draw current from the source of AC power whereby the total current drawn from the source of AC power has a total harmonic distortion below about 33.3%; and whereby the lamp current crest factor below about 2.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.