Circuits for operating electric discharge lamps
US4227118A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1978 |
| Grant date | Oct 7, 1980 |
| Priority date | — |
| Expiry date | Nov 17, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric discharge lamp circuit arrangement wherein rapid starting of the lamp is obtained by charging a ballast impedance capacitance via a unidirectional current conducting path in a sense such as to breakdown a voltage breakdown device in the control electrode lead of a controllable switching device connected with the lamp to provide a current path between the supply terminals comprising, in series, the capacitance, heating means for the lamp main electrodes and the switching device. On breakdown, the switching device temporarily conducts to complete the series path and cause a pulse of current to flow through the heating means, whereafter the capacitor recharges and a further current pulse is produced. The unidirectional current path may extend through the breakdown device or by-pass the breakdown device via a rectifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.