Dual mode solid state inverter circuit for starting and ballasting gas discharge lamps
US4060751A · kind A · utility
79Cited by
10References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1976 |
| Grant date | Nov 29, 1977 |
| Priority date | — |
| Expiry date | Mar 1, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable frequency ac source drives a gas discharge lamp connected as a damping element in an otherwise high Q L-C circuit. Commutation of the ac source voltage is initiated as the instantaneous current drawn from the source equals a predetermined reference current level. Prior to lamp ignition the ac source drives the L-C circuit at resonance causing a voltage buildup which initiates an ignition. After ignition the source limits lamp current to provide a ballasting function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.