GB541489A - Improvements in and relating to electric discharge apparatus - Google Patents
Improvements in and relating to electric discharge apparatusInfo
- Publication number
- GB541489A GB541489A GB9304/40A GB930440A GB541489A GB 541489 A GB541489 A GB 541489A GB 9304/40 A GB9304/40 A GB 9304/40A GB 930440 A GB930440 A GB 930440A GB 541489 A GB541489 A GB 541489A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- transformer
- supplies
- lamp
- branch circuit
- 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
- 238000010438 heat treatment Methods 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 238000004804 winding Methods 0.000 abstract 2
- 230000004907 flux Effects 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
541,489. Supply circuits for discharge lamps. BRITISH THOMSON-HOUSTON CO., Ltd. May 27, 1940, No. 9304. Convention date, May 27, 1939. [Class 38 (iv)] [Also in Group XL] Starting, and pre-heating the electrodes of a gaseous discharge device is effected by supplying the device e.g. a lamp through a step-up auto transformer 8, the full (secondary) winding of which is connected to one electrode 2 of the lamp and a portion of the winding (the primary) is connected in a branch resonant circuit containing a reactional 10 and a capacitance 11 to the other electrode 3; the branch circuit supplies the heating current for both the filaments. As shown, the branch circuit includes the filament 3 and it supplies the filament 2 from a secondary 12 on the reactional 10 which is in the form of a transformer with air gaps 13 and a saturable magnetic shunt 15. When the lamp strikes the filament heating supply is reduced owing to the reduced flux through the secondary because of the magnetic shunt. In a modification the reactance 10 serving as a ballast is a plain reactor and the branch circuit is taken through the primary of an auxiliary transformer the secondary of which supplies the filament 2. In a further modification a secondary on the reactor 10 is connected to the filament 2 and to a tapping on the auto-transformer so that the voltage applied to it is the vector sum of the two sources which is much reduced when the discharge starts owing to the considerable phase-angle between them.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US541489XA | 1939-05-27 | 1939-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB541489A true GB541489A (en) | 1941-11-28 |
Family
ID=21989067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9304/40A Expired GB541489A (en) | 1939-05-27 | 1940-05-27 | Improvements in and relating to electric discharge apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB541489A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193393B (en) * | 1986-07-23 | 1990-11-21 | To Yuen | A starting and operating circuit for a fluorescent light |
-
1940
- 1940-05-27 GB GB9304/40A patent/GB541489A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193393B (en) * | 1986-07-23 | 1990-11-21 | To Yuen | A starting and operating circuit for a fluorescent light |
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