GB712815A - Improvements in or relating to circuits for operating electric discharge lamps - Google Patents
Improvements in or relating to circuits for operating electric discharge lampsInfo
- Publication number
- GB712815A GB712815A GB1006650A GB1006650A GB712815A GB 712815 A GB712815 A GB 712815A GB 1006650 A GB1006650 A GB 1006650A GB 1006650 A GB1006650 A GB 1006650A GB 712815 A GB712815 A GB 712815A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- circuit
- primary winding
- ballast
- capacitor
- 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
- H05B41/20—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
712,815. Supply and protective arrangements for space discharge apparatus. GENERAL ELECTRIC CO., Ltd., and CATES, J. May 25, 1951 [April 24, 1950], No. 10066/50. Class 38(4) In a supply circuit for one or a plurality of series-connected low-pressure heatablecathode electric discharge lamps T1, T2 wherein a cathode-heating transformer has a primary winding P connected across A.C. supply terminals L, N and heating secondary windings S1...S3 arranged for connection to the lamp cathodes F1...F4, and wherein there are lamp discharge current supply connections between the primary winding and secondary windings S1, S2, the primary winding is connected to the input terminals in series with a capacitor C4 forming part of lamp ballast impedance, and a further, non-resonant, capacitor C3 is connected in series with the primary winding as regards its connection across the lamp(s) to prevent the generation and flow of direct current through such winding should one cathode of a lamp fail to give adequate electron emission. As shown, the capacitor C3 may be in the discharge path and form part of the ballast, or it may be out of such path, Fig. 3 (not shown). The ballast includes a current wave-form improving choke I, the circuit includes radio interference suppression, condensers C2, C5, and the lamp(s) have starting strips E which may be earthed. The overall ballast may be inductive or capacitive, and a capacitive circuit may operate in parallel with an inductive circuit to reduce stroboscopic. flicker and to correct the power factor. Figs. 3, 4 and 6 (not shown), illustrate various single-lamp circuit arrangements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1006650A GB712815A (en) | 1950-04-24 | 1950-04-24 | Improvements in or relating to circuits for operating electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1006650A GB712815A (en) | 1950-04-24 | 1950-04-24 | Improvements in or relating to circuits for operating electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB712815A true GB712815A (en) | 1954-08-04 |
Family
ID=9960813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1006650A Expired GB712815A (en) | 1950-04-24 | 1950-04-24 | Improvements in or relating to circuits for operating electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB712815A (en) |
-
1950
- 1950-04-24 GB GB1006650A patent/GB712815A/en not_active Expired
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