Circuit arrangement for igniting and operating gas-discharge lamps
US5057752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1990 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Jun 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A novel circuit for igniting and operating gas discharge lamps, in particular metal vapour lamps, comprises a buffer capacitor (C4) connected to a direct-current voltage (1,2) and connected in parallel with a circuit consisting of a choke and a capacitor connected in series (L1, C1). An electronic switch (S), for example a transistor and a recovery diode (D), is connected in parallel with the capacitor (C1). A second choke-capacitor series circuit (L2, C3) connected in series with the metal vapour lamp (L) is connected in parallel with the capacitor (C1), which is connected in parallel with the electronic switch (S). A second capacitor (C2) is directly connected in parallel with the the metal vapour lamp (L). The ignition circuit and the power supply circuit for the metal vapour lamp (L) are combined in this fluorescent lamp ballast, thus obviating the need for a separate ignition circuit. In addition, the circuit operates independently of the supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.