GB713734A - Improvements in supply circuits for electric discharge tubes - Google Patents
Improvements in supply circuits for electric discharge tubesInfo
- Publication number
- GB713734A GB713734A GB1761150A GB1761150A GB713734A GB 713734 A GB713734 A GB 713734A GB 1761150 A GB1761150 A GB 1761150A GB 1761150 A GB1761150 A GB 1761150A GB 713734 A GB713734 A GB 713734A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supply
- main winding
- tube
- capacitor
- electrodes
- 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 9
- 239000003990 capacitor Substances 0.000 abstract 3
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000001681 protective effect Effects 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
713,734. Supply systems for space discharge apparatus: protective arrangements. THORN ELECTRICAL INDUSTRIES. Ltd. May 8, 1951 [July 13, 19501, No. 17611/50. Class 38(4) In a supply circuit for one or a pair of hot-cathode electric discharge tubes, e.g. lamps D1, D2, each having two filamentary electrodes E1, E2, E3, E4, wherein at least part of the main winding W1 of a transformer F having filament heating windings W2...W4 is connected in shunt with the lamp(s) and at least part of such main winding is connected in series with a ballast capacitor C1 to A.C. supply terminals L, N, a further capacitor C2 is connected in series with the tube(s) and the firts mentioned at least part of the main winding to prevent the circulation of undirectional current through the latter should the thermionic emissions of the two electrodes of a tube become unequal as the tube ages. The ballast impedance includes a choke B, or two chokes, Figs. 3 and 4 (not shown), one connected in each supply lead. The secondary winding W3 is autoconnected, and the other secondary windings W2, W4 are separate from the main winding W1. Preferably the resonance frequency of the capacitor C1 and main winding W1 is near or equal to that of the supply to apply a voltage higher than that of the supply between the lamp electrodes before starting. With only part of the main winding connected across the supply, or across the tubes, the ratio provided by such transformer differs from 1:1. Figs 1... 4 (not shown), illustrate various single tube circuit arrangements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1761150A GB713734A (en) | 1950-07-13 | 1950-07-13 | Improvements in supply circuits for electric discharge tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1761150A GB713734A (en) | 1950-07-13 | 1950-07-13 | Improvements in supply circuits for electric discharge tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB713734A true GB713734A (en) | 1954-08-18 |
Family
ID=10098169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1761150A Expired GB713734A (en) | 1950-07-13 | 1950-07-13 | Improvements in supply circuits for electric discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB713734A (en) |
-
1950
- 1950-07-13 GB GB1761150A patent/GB713734A/en not_active Expired
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