GB682716A - Means for controlling the candle-power of luminous electric discharge tubes - Google Patents
Means for controlling the candle-power of luminous electric discharge tubesInfo
- Publication number
- GB682716A GB682716A GB14936/50A GB1493650A GB682716A GB 682716 A GB682716 A GB 682716A GB 14936/50 A GB14936/50 A GB 14936/50A GB 1493650 A GB1493650 A GB 1493650A GB 682716 A GB682716 A GB 682716A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transductor
- tubes
- transformer
- windings
- groups
- 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
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/391—Controlling the intensity of light continuously using saturable magnetic devices
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
682,716. Supply systems for space discharge apparatus. ALLMANNA SVENSKA ELEKTRISKA AKTIEBOLAGET. June 15, 1950 [June 20, 1949; March 13, 1950], No. 14936/50. Class 38 (iv). The light output of one or more groups of one or two series-connected tubes is controlled by an adjustable impedance connected on the secondary side of each lamp group supply transformer, the latter having separate windings for heating the tube electrodes. In the preferred embodiment shown, the primary winding of a high reactance transformer 35 is auto-connected with the discharge current supplying secondary winding in a series circuit comprising the tubes 1, 2, undirectional valves 41 and the selfexcitation windings 39, 40 of a two-cored transductor 36. The tube current is controlled by variation of a rheostat 25 in the energizing circuit, comprising a rectifier 26 and a current transformer 33 in the supply line 6, of seriesconnected transductor windings 42, 43. A resistor 30 shunts the tubes to by-pass part of the no-load current to permit very low levels of illumination, and further tube groups may be connected to conductors 47, 48 for simultaneous control. In other embodiments a separate ballast reactor and double-wound normal reactance transformer may replace that shown, and a rheostat replaces the transductor; or a single transductor may control all the groups through a plurality of further transformers, one for each group.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE682716X | 1949-06-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB682716A true GB682716A (en) | 1952-11-12 |
Family
ID=20314956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14936/50A Expired GB682716A (en) | 1949-06-20 | 1950-06-15 | Means for controlling the candle-power of luminous electric discharge tubes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB682716A (en) |
-
1950
- 1950-06-15 GB GB14936/50A patent/GB682716A/en not_active Expired
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