GB772525A - Improvements in or relating to circuit arrangements comprising gas and/or vapour filled electric discharge tubes - Google Patents
Improvements in or relating to circuit arrangements comprising gas and/or vapour filled electric discharge tubesInfo
- Publication number
- GB772525A GB772525A GB9141/55A GB914155A GB772525A GB 772525 A GB772525 A GB 772525A GB 9141/55 A GB9141/55 A GB 9141/55A GB 914155 A GB914155 A GB 914155A GB 772525 A GB772525 A GB 772525A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- circuit
- filament heating
- winding
- windings
- 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
772,525. Supply systems for space discharge tubes. PHILIPS ELECTRICAL INDUSTRIES, Ltd. March 29, 1955 [April 1, 1954], No. 9141/55. Class 38 (4). In a circuit arrangement comprising a gas and/or vapour-filled electric discharge tube, e.g. a fluorescent lamp 1 having two filament electrodes 12, 13 and a combined filament heating and arc discharge current supply transformer 6 having two filament heating current supply windings 5-16 and 18-2 for supplying the electrodes, the transformer has a ferromagnetic shunt 7 making it magnetically leaky, the filament heating windings .are positioned one on each side of the shunt 7, and the filament heating circuits each include a separate respective winding 14, 17 of a separate auxiliary transformer 15; the latter windings are magnetically coupled together and the transformer 15 has the property of low impedance when on load but high impedance when on no load whereby should one filament heating circuit be interrupted the impedance of the winding 14 or 17 in the other circuit becomes so high that the electrode in the said other circuit is not brought to an electron-emissive temperature, thereby preventing initiation of the discharge in the lamp when one electrode is unheated. As shown, the transformer 6 is auto-wound, comprising a primary winding 2-8 with a tapping at 11 for connection to A.C. input terminals 9, 10 and a discharge current supplying secondary winding 2-3 and 4-5. The lamp may have on the inner or outer side of its envelope an electrically conductive coating not shown to facilitate ignition. Suitable values and constructions of circuit components are described in the Specification. Specification 771,940 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL772525X | 1954-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB772525A true GB772525A (en) | 1957-04-17 |
Family
ID=19829897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9141/55A Expired GB772525A (en) | 1954-04-01 | 1955-03-29 | Improvements in or relating to circuit arrangements comprising gas and/or vapour filled electric discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB772525A (en) |
-
1955
- 1955-03-29 GB GB9141/55A patent/GB772525A/en not_active Expired
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