GB755776A - Improvements in or relating to electric circuits for starting and operating fluorescent lamps - Google Patents

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

Info

Publication number
GB755776A
GB755776A GB14283/54A GB1428354A GB755776A GB 755776 A GB755776 A GB 755776A GB 14283/54 A GB14283/54 A GB 14283/54A GB 1428354 A GB1428354 A GB 1428354A GB 755776 A GB755776 A GB 755776A
Authority
GB
United Kingdom
Prior art keywords
winding
lamp
impedance
extension
starting
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
GB14283/54A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB755776A publication Critical patent/GB755776A/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

755,776. Supply systems for space discharge lamps. TELEFONAKTIEBOLAGET L. M. ERICSSON. May 14, 1954 [May 16, 1953], No. 14283/54. Class 38 (4). A fluorescent electric discharge lamp starting and operating circuit, comprising a filamentary preheatable electrode gas-discharge lamp 1 serially connected with an inductive ballast winding 4 across A.C. source terminals A, B, in parallel with a similar lamp 2 serially connected with an inductive ballast winding 5 and at least one condenser 6 across said source terminals, is provided with an electrode heating transformer 8 for heating one or both electrodes 3 of each lamp at least during starting thereof, the primary winding of the transformer 8 being connected to the source terminals A, B, respectively through a part only of the first winding 4 and at least through an impedance, as shown, an extension of the second winding 5; the voltage appearing across the impedance is arranged to be dependent upon the current passing through the second lamp 2 and the value of the impedance is such that the primary winding voltage when the lamps are operating is less than that across terminals A, B or is substantially zero, whereby the electrode heating current is reduced from the value obtaining before the lamps started running. In modifications various arrangements and connections of the winding 5, its extension and the condenser 6 are described, and a further condenser 6 may replace the extension of winding 5.
GB14283/54A 1953-05-16 1954-05-14 Improvements in or relating to electric circuits for starting and operating fluorescent lamps Expired GB755776A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE755776X 1953-05-16

Publications (1)

Publication Number Publication Date
GB755776A true GB755776A (en) 1956-08-29

Family

ID=20326594

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14283/54A Expired GB755776A (en) 1953-05-16 1954-05-14 Improvements in or relating to electric circuits for starting and operating fluorescent lamps

Country Status (1)

Country Link
GB (1) GB755776A (en)

Similar Documents

Publication Publication Date Title
GB755776A (en) Improvements in or relating to electric circuits for starting and operating fluorescent lamps
GB919753A (en) Circuit arrangement for energizing electric discharge devices
ES267433A1 (en) High frequency lighting systems and ballast circuits therefor
GB1317661A (en) Circuit arrangements for dimming discharge lamps
GB760674A (en) Improvements relating to starting circuits for electric discharge lamps
GB713734A (en) Improvements in supply circuits for electric discharge tubes
GB739045A (en) Improvements in dimming circuits for electric discharge lamps
GB762489A (en) Improvements in or relating to electric circuit arrangements for starting and operating at least one low pressure electric discharge lamp
GB723932A (en) Improvements relating to circuit arrangements for starting and operating hot-cathodeelectric discharge lamps
GB639295A (en) Improvements in supply circuits for electric discharge tubes
GB912181A (en) Improvements in or relating to circuit arrangements for fluorescent lamps
GB757080A (en) Improvements in and relating to operating circuits for electric discharge lamps
GB720264A (en) Improvements in operating circuits for electric discharge lamps
GB587660A (en) Circuit arrangements for electric discharge lamps
GB828750A (en) Improvements in circuits for electric discharge lamps
GB703255A (en) Improvements in electric circuit arrangements for operating low pressure electric discharge lamps having preheatable electrodes
GB567377A (en) Improved circuit arrangement for operating electric discharge lamps
GB786067A (en) Improvements in or relating to electric circuit arrangements for operating gas or vapour filled electric discharge lamps
GB730024A (en) Improvements in or relating to circuit arrangements for operating electric dischargelamps having heatable electrodes
GB830202A (en) Improvements in or relating to circuit arrangem operating electric lamps
GB756431A (en) Improvements in and relating to circuits for starting and operating electric discharge tubes
GB754993A (en) Improvements in or relating to circuits comprising two gas and/or vapour filled electric discharge tubes
GB712815A (en) Improvements in or relating to circuits for operating electric discharge lamps
GB782854A (en) Improvements in and relating to electric discharge tube circuits
GB772525A (en) Improvements in or relating to circuit arrangements comprising gas and/or vapour filled electric discharge tubes