GB738573A - Improvements in and relating to circuits for operating electric discharge lamps - Google Patents
Improvements in and relating to circuits for operating electric discharge lampsInfo
- Publication number
- GB738573A GB738573A GB2831651A GB2831651A GB738573A GB 738573 A GB738573 A GB 738573A GB 2831651 A GB2831651 A GB 2831651A GB 2831651 A GB2831651 A GB 2831651A GB 738573 A GB738573 A GB 738573A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- switch
- lamp
- shunted
- coil
- 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
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
- H05B41/18—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 a starting switch
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
738,573. Supply systems for space discharge lamps. THORN ELECTRICAL INDUSTRIES, Ltd. Aug. 7, 1952 [Dec. 3, 1951; Jan. 28, 1952], Nos. 28316/51 and 2339/52. Class 38 (4). A hot cathode discharge lamp 10 serially connected with a ballast impedance 14, 15 across input terminals 16, 20 is started by an electromagnetic relay having a first switch 21 arranged to serially interconnect the two filamentary electrodes 12, 18 of the lamp through the ballast to the source and having an operating coil 22 connected either in shunt, or as shown, in series, with a resistor 23 having a negative resistance/temperature coefficient; the circuit is such that, on starting, the switch 21 is closed to permit filament heating for a period predetermined by the time taken for the resistance of resistor 23 to fall due to heating thereof by current flow, whereupon the relay opens the first switch to start the lamp and maintains it open during running. As shown, the coil 22 and resistor 23 are shunted across the resistive part 14 of the ballast impedance and during running the resistor 23 is shunted by a second switch 24 of the relay. Two or more series-connected lamps may replace the single lamp shown, there being provided a respective first switch 21 for each lamp and all such switches operating sequentially. The circuit shown operates on D.C., but in a modification, not shown, for use on A.C., the coil 22 and resistor 23 in series are shunted across an auxiliary winding on the ballast inductance 15. In the embodiment wherein the coil 22 is shunted by resistor 23 such components are shunted, through an impedance, across the lamp the switch 21 being in this case normally open instead of normally closed as shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2831651A GB738573A (en) | 1951-12-03 | 1951-12-03 | Improvements in and relating to circuits for operating electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2831651A GB738573A (en) | 1951-12-03 | 1951-12-03 | Improvements in and relating to circuits for operating electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB738573A true GB738573A (en) | 1955-10-19 |
Family
ID=10273719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2831651A Expired GB738573A (en) | 1951-12-03 | 1951-12-03 | Improvements in and relating to circuits for operating electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB738573A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1029476B (en) * | 1954-05-31 | 1958-05-08 | Gottlob Widmann & Soehne Komma | Ignition and operating device for electric discharge lamps |
| DE1073624B (en) * | 1960-01-21 | Gottlieb Widmann 6. Söhne Kommanditgesellschaft, Schwenningen/Neckar | Ignition and operating equipment for electric discharge lamps with preheatable hot cathodes | |
| DE1100168B (en) * | 1958-08-01 | 1961-02-23 | Badischer Normteile Und Appbau | Circuit arrangement for the simultaneous lighting of a larger number of low-voltage fluorescent lamps |
| US4316121A (en) * | 1979-11-01 | 1982-02-16 | General Electric Company | Integrally ballasted fluorescent lamp unit |
-
1951
- 1951-12-03 GB GB2831651A patent/GB738573A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1073624B (en) * | 1960-01-21 | Gottlieb Widmann 6. Söhne Kommanditgesellschaft, Schwenningen/Neckar | Ignition and operating equipment for electric discharge lamps with preheatable hot cathodes | |
| DE1029476B (en) * | 1954-05-31 | 1958-05-08 | Gottlob Widmann & Soehne Komma | Ignition and operating device for electric discharge lamps |
| DE1100168B (en) * | 1958-08-01 | 1961-02-23 | Badischer Normteile Und Appbau | Circuit arrangement for the simultaneous lighting of a larger number of low-voltage fluorescent lamps |
| US4316121A (en) * | 1979-11-01 | 1982-02-16 | General Electric Company | Integrally ballasted fluorescent lamp unit |
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