High power factor electronic ballast with fully differential circuit topology
US6271633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Nov 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast circuit for driving a gas discharge lamp from a mains voltage signal supply includes a ballast bridge unit that has an upper and lower signal line. A storage capacitor is coupled across the bridge unit. The bridge unit also includes an input converter bridge having at least two switches coupled in series at an input common terminal, wherein the upper switch is coupled to the upper signal line of the ballast bridge unit and the lower switch is coupled to the lower signal line. The ballast bridge also includes an output converter bridge having at least two switches coupled in series at an output common terminal. A reference voltage signal bridge in the ballast bridge unit includes at least two switches coupled in series at a reference voltage common terminal, so as to form a first differential voltage signal between the common input terminal and the reference voltage common terminal and a second differential voltage signal between the common output terminal and the reference voltage common terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.