GB757080A - Improvements in and relating to operating circuits for electric discharge lamps - Google Patents
Improvements in and relating to operating circuits for electric discharge lampsInfo
- Publication number
- GB757080A GB757080A GB1240452A GB1240452A GB757080A GB 757080 A GB757080 A GB 757080A GB 1240452 A GB1240452 A GB 1240452A GB 1240452 A GB1240452 A GB 1240452A GB 757080 A GB757080 A GB 757080A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- lamps
- impedance
- transformer
- primary winding
- 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
- 238000004804 winding Methods 0.000 abstract 4
- 230000000087 stabilizing effect Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000010079 rubber tapping 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)
Abstract
757,080. Supply systems for space discharge apparatus. BROWN, R. Feb. 13, 1950 [Feb. 11, 1949], No. 12404/52. Divided out of 757,067. Class 38 (4). A circuit for two or more low-pressure fluorescent discharge lamps 10, 11 having filamentary electrodes 13... 16 comprises a resistive stabilizing impedance and a single transformer for supplying pre-heating current to all the lamp filaments, the primary winding 17 of such transformer being connected in shunt with at least one of the lamps and in series, across an A.C. supply, with the resistive impedance for that lamp or lamps in respect of which the shunt connection subsists. The impedance is such that its resistance is low when the impedance is cold and high when hot and may be an incandescent filament lamp 12. The transformer may be auto-wound, the preheating current being supplied from both primary winding tappings and a separate secondary winding 18. As shown, there are two series-connected lamps, but the Complete Specification drawing, not shown, illustrates two parallel connected lamps each having a separate stabilizing impedance and one having a series capacitor which during starting is in resonance, or nearly in resonance, with the transformer primary winding. Starting is arrested by two metal strips running closely along the whole lamp envelope, which strips may be the edges of a U-shaped conductor carrying part of the lamp fitting and connected to the lamp electrodes or to the supply through a resistance and/or a condenser. Specification 757,067 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1240452A GB757080A (en) | 1949-02-11 | 1949-02-11 | Improvements in and relating to operating circuits for electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1240452A GB757080A (en) | 1949-02-11 | 1949-02-11 | Improvements in and relating to operating circuits for electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB757080A true GB757080A (en) | 1956-09-12 |
Family
ID=10003966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1240452A Expired GB757080A (en) | 1949-02-11 | 1949-02-11 | Improvements in and relating to operating circuits for electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB757080A (en) |
-
1949
- 1949-02-11 GB GB1240452A patent/GB757080A/en not_active Expired
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