Discharge lamp starting and operating circuit
US4355265A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Dec 15, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for starting and operating a low wattage high intensity discharge lamp from a source of AC line voltage. The circuit includes a glow starter device having a first terminal connected to a first bimetal, a second terminal connected to a second bimetal, and third terminal connected to a rigid conductive member, the bimetals being electrically connected together at one end which makes a normally closed contact with the rigid member in the quiescent state of the device. A choke coil and a capacitor are series connected in that order between one of the AC input terminals and the second terminal of the starter device, and a second AC input terminal is connected to the third terminal of the starter. The first and third terminals of the starter device are connected across the discharge lamp terminals. Upon initial energization of the circuit, short circuit current flows through the second and third terminals of the starter device to cause flexing of the second bimetal for separating the bimetals from the rigid member to provide an open circuit thereat and a switching transient across the lamp. Upon starting of the lamp, the lamp current flow through the first and second terminals …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.