Lamp ballast circuit and driving method thereof
US8415891B2 · kind B2 · utility
2Cited by
8References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2008 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Aug 15, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/282
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a lamp ballast circuit and a driving method. The lamp ballast circuit includes a voltage detector for detecting the level of a first voltage corresponding to an input voltage, a controller including an oscillator for changing the oscillation frequency according to the level of the first voltage, and an output unit for changing the frequency of the output voltage in correspondence to the oscillation frequency. Therefore, a lamp ballast circuit having less power consumption and that is operable by a lesser input current with less THD and a driving method thereof are realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.