GB786067A - Improvements in or relating to electric circuit arrangements for operating gas or vapour filled electric discharge lamps - Google Patents
Improvements in or relating to electric circuit arrangements for operating gas or vapour filled electric discharge lampsInfo
- Publication number
- GB786067A GB786067A GB2432054A GB2432054A GB786067A GB 786067 A GB786067 A GB 786067A GB 2432054 A GB2432054 A GB 2432054A GB 2432054 A GB2432054 A GB 2432054A GB 786067 A GB786067 A GB 786067A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- capacitor
- inductor
- inductors
- supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 abstract 6
- 230000004907 flux Effects 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/16—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies
- H05B41/20—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch
- H05B41/23—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
- H05B41/232—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
- H05B41/2325—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
786,067. Supply systems for space discharge lamps. GENERAL ELECTRIC CO., Ltd., and CATES, J. Aug. 12, 1955 [Aug. 20, 1954], No. 24320/54. Class 38 (4). An electric circuit arrangement for operating from an A.C. supply one or a plurality of series-connected gas- or vapour-filled electric discharge lamps 3 comprises two long terminals 1, 2 between which the lamp is arranged to be connected, two input terminals 5, 6 for connection to the supply, a first inductor 7 connected between one lamp and one input terminal 1, 5 and a second inductor 8 serially connected with a capacitor 10 between the two input terminals 5, 6, the latter also being connected to the other lamp terminal 2; the two inductors are arranged with magnetic leakage between them on a common magnetic core 9 and in flux opposition when considered with reference to a current flowing through them in series, and the values of the inductors and of capacitor are such that the circuit is non- resonant at the supply frequency for which it is designed and the impedance of the capacitor 10 is substantially greater than that of the second inductor 8 at the said frequency whereby the starting voltage applied between the lamp terminals 1, 2 is greater than the supply voltage applied between the input terminals 5, 6 by reason only of phase relationships of voltages across the inductors and the capacitor. The inductors 7, 8 may have the same number of turns, and to prevent flicker at low ambient temperatures a resistor, not shown, may be serially connected on either side of the capacitor 10 or a tungsten filament lamp may be shunted across inductor 8. The lamp may be a L.P.M.V. fluorescent lamp and may have an earthed starting strip 4, and if instead of the cold-start electrodes shown it has preheatable electrodes these may be heated by one or two secondary windings wound over the inductor 8, in the former case the other electrode being heated by being connected in series between the capacitor 10 and input terminal 6. Inductor designs and circuit component parameters are described in the Specification. Specification 565,604 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2432054A GB786067A (en) | 1954-08-20 | 1954-08-20 | Improvements in or relating to electric circuit arrangements for operating gas or vapour filled electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2432054A GB786067A (en) | 1954-08-20 | 1954-08-20 | Improvements in or relating to electric circuit arrangements for operating gas or vapour filled electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB786067A true GB786067A (en) | 1957-11-13 |
Family
ID=10209842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2432054A Expired GB786067A (en) | 1954-08-20 | 1954-08-20 | Improvements in or relating to electric circuit arrangements for operating gas or vapour filled electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB786067A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3350605A (en) * | 1965-06-09 | 1967-10-31 | Thorn Electrical Ind Ltd | Transformer with two-part core for fluorescent lamp circuits |
-
1954
- 1954-08-20 GB GB2432054A patent/GB786067A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3350605A (en) * | 1965-06-09 | 1967-10-31 | Thorn Electrical Ind Ltd | Transformer with two-part core for fluorescent lamp circuits |
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