GB828750A - Improvements in circuits for electric discharge lamps - Google Patents

Improvements in circuits for electric discharge lamps

Info

Publication number
GB828750A
GB828750A GB33278/57A GB3327857A GB828750A GB 828750 A GB828750 A GB 828750A GB 33278/57 A GB33278/57 A GB 33278/57A GB 3327857 A GB3327857 A GB 3327857A GB 828750 A GB828750 A GB 828750A
Authority
GB
United Kingdom
Prior art keywords
lamp
lamps
transformer
filamentary
electrode heating
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
GB33278/57A
Inventor
Donald Frederick Chapman
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.)
Thorn Electrical Industries Ltd
Original Assignee
Thorn Electrical Industries 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 Thorn Electrical Industries Ltd filed Critical Thorn Electrical Industries Ltd
Priority to GB33278/57A priority Critical patent/GB828750A/en
Publication of GB828750A publication Critical patent/GB828750A/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

828,750. Supply circuits for space-discharge lamps. THORN ELECTRICAL INDUSTRIES Ltd. Oct. 3, 1958 [Oct. 24, 1957], No. 33278/57. Class 38 (4). An operating circuit for two or more discharge lamps 16, 16<SP>1</SP> in parallel comprises a lamp electrode heating transformer 10, the primary winding of which is connected across the supply terminals 12, 13 in series with a capacitor 11 for power factor improvement, each lamp having a serially connected ballast choke 17 or 17<SP>1</SP> whilst secondary windings 14, 15 of the transformer 10 are connected to the filamentary electrodes of the lamp 16 and the secondary winding 19 connected to one of the filamentary electrodes of lamp 16<SP>1</SP> the other filamentary electrode of which is connected in series with the discharge path of lamp 16. Thus the lamps operate sequentially and when both lamps 16, 16<SP>1</SP> are started the primary winding of transformer 10 carries two currents, phase displaced by a considerable angle, thus reducing the electrode heating currents. The circuit may be modified to include more than two lamps, the reduction in electrode heating current taking place after the last lamp has started.
GB33278/57A 1957-10-24 1957-10-24 Improvements in circuits for electric discharge lamps Expired GB828750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB33278/57A GB828750A (en) 1957-10-24 1957-10-24 Improvements in circuits for electric discharge lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB33278/57A GB828750A (en) 1957-10-24 1957-10-24 Improvements in circuits for electric discharge lamps

Publications (1)

Publication Number Publication Date
GB828750A true GB828750A (en) 1960-02-24

Family

ID=10350849

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33278/57A Expired GB828750A (en) 1957-10-24 1957-10-24 Improvements in circuits for electric discharge lamps

Country Status (1)

Country Link
GB (1) GB828750A (en)

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