Variable high frequency ballast circuit
US4700113A · kind A · utility
116Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1981 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Dec 28, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable high-frequency ballast circuit for igniting and operating energy saver discharge lamps includes a high frequency inverter that energizes the lamps with a given high frequency voltage at which reliable lamp ignition is assured. The lamp current is monitored so as to automatically increase the lamp operating frequency to an optimum value as soon as the lamps ignite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.