GB895970A - Improvements in or relating to circuits for starting and operating electric discharge lamps - Google Patents

Improvements in or relating to circuits for starting and operating electric discharge lamps

Info

Publication number
GB895970A
GB895970A GB4090558A GB4090558A GB895970A GB 895970 A GB895970 A GB 895970A GB 4090558 A GB4090558 A GB 4090558A GB 4090558 A GB4090558 A GB 4090558A GB 895970 A GB895970 A GB 895970A
Authority
GB
United Kingdom
Prior art keywords
lamps
starting
terminals
coils
supply
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
Application number
GB4090558A
Inventor
Donald Dunthorne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB4090558A priority Critical patent/GB895970A/en
Publication of GB895970A publication Critical patent/GB895970A/en
Expired legal-status Critical Current

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

895,970. Supply systems for space discharge apparatus. GENERAL ELECTRIC CO. Ltd. Dec. 3, 1959 [Dec. 18, 1958], No. 40905/58. Class 38 (4). A starting and operating circuit for two or more electric discharge lamps includes two branches connected in parallel between the input terminals 1, 2 of a D.C. supply for the discharge currents, each branch comprising a ballast resistor 4 or 8, a choke coil 3 or 7 and lamps such as L1 to L8 or L9 to L16, the choke coils 3, 7 being wound on a common magnetic core in opposite senses so that the discharge currents in the two branches produce equal and opposite magnetic fluxes in the core, and starting terminals 14, 17 to which an alternating voltage to facilitate starting can be applied. In operation, and as applied to a train lighting installation, the input terminals 1 and 2 are supplied from the D.C. track circuit and the A.C. starting terminals 14, 17 are supplied from a power transistor oscillator 13 fed from the train's batteries and provided with a further output terminal 15. Transformers 19, only two of which are shown, each having three secondary windings 20, 21, 22, provide electrode heating current for the lamps and are connected in parallel between the terminals 14, 15 with a resistor 23, of negative temperature coefficient of resistance, in circuit to limit the heating current at starting. A starting voltage comprising the direct voltage across terminals 1 and 2 together with the alternating voltage across terminals 14 and 17 appears across the lamps L1 to L8, and by way of the coupled coils 3 and 7, across the lamps L9 and L10. When the lamps have started the high inductance of the coils 3 and 7, resulting from the fact that the discharge currents flowing through them produce no net magnetizing flux, prevents current passing from the A.C. terminals 14 and 17 to the direct current source, and the amount of this current passing through the lamps is limited by a capacitor 18 connected between terminal 17 and a terminal 16 of the supply 13.
GB4090558A 1958-12-18 1958-12-18 Improvements in or relating to circuits for starting and operating electric discharge lamps Expired GB895970A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4090558A GB895970A (en) 1958-12-18 1958-12-18 Improvements in or relating to circuits for starting and operating electric discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4090558A GB895970A (en) 1958-12-18 1958-12-18 Improvements in or relating to circuits for starting and operating electric discharge lamps

Publications (1)

Publication Number Publication Date
GB895970A true GB895970A (en) 1962-05-09

Family

ID=10417196

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4090558A Expired GB895970A (en) 1958-12-18 1958-12-18 Improvements in or relating to circuits for starting and operating electric discharge lamps

Country Status (1)

Country Link
GB (1) GB895970A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2525848A1 (en) * 1982-04-21 1983-10-28 Helvar Oy METHOD AND APPARATUS FOR PROVIDING HIGH FREQUENCY ALTERNATING CURRENT TO A FLUORESCENCE LAMP

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2525848A1 (en) * 1982-04-21 1983-10-28 Helvar Oy METHOD AND APPARATUS FOR PROVIDING HIGH FREQUENCY ALTERNATING CURRENT TO A FLUORESCENCE LAMP
GB2119184A (en) * 1982-04-21 1983-11-09 Helvar Oy High frequency current supply method and apparatus
US5034660A (en) * 1982-04-21 1991-07-23 Oy Helvar Method of and apparatus for supplying high frequency alternating current to a fluorescence lamp

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