GB828750A - Improvements in circuits for electric discharge lamps - Google Patents
Improvements in circuits for electric discharge lampsInfo
- Publication number
- GB828750A GB828750A GB33278/57A GB3327857A GB828750A GB 828750 A GB828750 A GB 828750A GB 33278/57 A GB33278/57 A GB 33278/57A GB 3327857 A GB3327857 A GB 3327857A GB 828750 A GB828750 A GB 828750A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- lamps
- transformer
- filamentary
- electrode heating
- 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
- 238000010438 heat treatment Methods 0.000 abstract 3
- 239000003990 capacitor Substances 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
828,750. Supply circuits for space-discharge lamps. THORN ELECTRICAL INDUSTRIES Ltd. Oct. 3, 1958 [Oct. 24, 1957], No. 33278/57. Class 38 (4). An operating circuit for two or more discharge lamps 16, 16<SP>1</SP> in parallel comprises a lamp electrode heating transformer 10, the primary winding of which is connected across the supply terminals 12, 13 in series with a capacitor 11 for power factor improvement, each lamp having a serially connected ballast choke 17 or 17<SP>1</SP> whilst secondary windings 14, 15 of the transformer 10 are connected to the filamentary electrodes of the lamp 16 and the secondary winding 19 connected to one of the filamentary electrodes of lamp 16<SP>1</SP> the other filamentary electrode of which is connected in series with the discharge path of lamp 16. Thus the lamps operate sequentially and when both lamps 16, 16<SP>1</SP> are started the primary winding of transformer 10 carries two currents, phase displaced by a considerable angle, thus reducing the electrode heating currents. The circuit may be modified to include more than two lamps, the reduction in electrode heating current taking place after the last lamp has started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33278/57A GB828750A (en) | 1957-10-24 | 1957-10-24 | Improvements in circuits for electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33278/57A GB828750A (en) | 1957-10-24 | 1957-10-24 | Improvements in circuits for electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB828750A true GB828750A (en) | 1960-02-24 |
Family
ID=10350849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33278/57A Expired GB828750A (en) | 1957-10-24 | 1957-10-24 | Improvements in circuits for electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB828750A (en) |
-
1957
- 1957-10-24 GB GB33278/57A patent/GB828750A/en not_active Expired
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