Single chip ballast control with power factor correction
US6956336B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2003 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Jul 8, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An integrated circuit provides a complete electronic ballast control with power factor correction for fluorescent lamps. The integrated circuit contains a simplified power factor correction (PFC) circuit to reduce component count and supply voltage requirements to reduce manufacturing costs while providing a robust control. The PFC circuit has a variable gain for fast response at high gain and optimized power factor control at low gain. An increased on time for the PFC switch when the input line voltage approaches zero dynamically reduces crossover distortion, thereby reducing total harmonic distortion. The integrated circuit incorporates a number of fault protections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.