Single transistor ballast with filament preheating
US5608292A · kind A · utility
8Cited by
7References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1995 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Jun 15, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast circuit for driving a gas discharge having a source of pulsating and rectified AC (20), an energy storage circuit (30), a switch (40) that can have one end connected to an energy storage inductor and an opposite end that can be connected to circuit common; a control circuit (50) for opening and closing the switch (40) at a rate that is a function of at least a DC control current, a resonant circuit (60) that is coupled to the energy storage circuit (30) for energizing the gas discharge lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.