GB646515A - Improvements in and relating to circuits for electric discharge devices - Google Patents

Improvements in and relating to circuits for electric discharge devices

Info

Publication number
GB646515A
GB646515A GB5644/48A GB564448A GB646515A GB 646515 A GB646515 A GB 646515A GB 5644/48 A GB5644/48 A GB 5644/48A GB 564448 A GB564448 A GB 564448A GB 646515 A GB646515 A GB 646515A
Authority
GB
United Kingdom
Prior art keywords
windings
lamps
electrode
voltages induced
operating
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
GB5644/48A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB646515A publication Critical patent/GB646515A/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

646,515. Supply systems for space discharge apparatus. BRITISH THOMSON-HOUSTON CO., Ltd. Feb. 25, 1948, No. 5644. Convention date, Feb. 28, 1947. [Class 38 (iv)] A circuit arrangement for a pair of discharge devices such as fluorescent lamps 1, 1<SP>1</SP> operating from lead and lag circuits, and in which the heating current supplied to the filamentary electrodes 3-6 is automatically reduced whilst the lamps are operating comprises a highreactance transformer 12 having a single primary winding 15, a pair of secondary windings 13, 14 connected respectively to the lamps direct and through a power factor correcting condenser 17, and three windings such as windings 18, 22, 26 for each filamentary electrode coupled respectively with the primary and two secondary windings and series-connected such that the winding 26 coupled with the secondary winding 14 bucks the voltages induced in the other two windings 18, 22. During preheating the voltages induced in windings 18, 22, 26 are respectively in phase and phase opposition resulting in a normal voltage applied across electrode 3. Whilst the lamps are operating the voltages induced in the respective windings 18, 22, 26 are displaced due to the phase displacements of the currents in the primary and secondary windings resulting in a reduced voltage applied to the electrode. An auxiliary electrode may be provided to assist starting and comprise an external strip 7, 7<SP>1</SP> extending along lamp envelope, such as a metallic paint, connected to one of the filamentary electrodes through a high impedance 8, 8<SP>1</SP>, such as is described in Specification 647,778, [Group XL (a)]. The transformer may be of the kind described in Specification 22527/47 (as open to inspection under Sect. 91).
GB5644/48A 1947-02-28 1948-02-25 Improvements in and relating to circuits for electric discharge devices Expired GB646515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US646515XA 1947-02-28 1947-02-28

Publications (1)

Publication Number Publication Date
GB646515A true GB646515A (en) 1950-11-22

Family

ID=22057382

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5644/48A Expired GB646515A (en) 1947-02-28 1948-02-25 Improvements in and relating to circuits for electric discharge devices

Country Status (1)

Country Link
GB (1) GB646515A (en)

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