Lamp ballast
US4001637A · kind A · utility
24Cited by
3References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1975 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Jun 12, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/392
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast circuit for coupling a lamp to an AC power source and having in series between the source and lamp a non-dissipative current limiting capacitor feeding a rectifier, the output of the rectifier being connected to a smoothing filter. The ballast lends itself particularly to use in connection with a dimmer control, and permits the use of a secondary path or bypass around the dimmer control through another capacitor feeding a rectifier formed as a diode bridge, thereby providing a minimum current level path to the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.