GB1365922A - Circuits for supplying power to fluorescent lamps - Google Patents

Circuits for supplying power to fluorescent lamps

Info

Publication number
GB1365922A
GB1365922A GB309471A GB309471A GB1365922A GB 1365922 A GB1365922 A GB 1365922A GB 309471 A GB309471 A GB 309471A GB 309471 A GB309471 A GB 309471A GB 1365922 A GB1365922 A GB 1365922A
Authority
GB
United Kingdom
Prior art keywords
circuit
lamp
heater
circuits
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
GB309471A
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.)
Victor Products Ltd
Original Assignee
Victor Products 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 Victor Products Ltd filed Critical Victor Products Ltd
Priority to GB309471A priority Critical patent/GB1365922A/en
Publication of GB1365922A publication Critical patent/GB1365922A/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
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • 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

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

1365922 Supply circuits for discharge lamps; intrinsically safe circuits VICTOR PRODUCTS (WALLSEND) Ltd 25 Jan 1972 [25 Jan 1971 18 Nov 1971] 3094/71 and 53633/71 Heading H2H A circuit for supplying power to a discharge lamp 17 comprises parallel branches 12, 13 containing capacitive and inductive reactances 14 and 18 respectively and a third branch 21 containing a reactance 22 which forms with the reactance 18 a circuit which is at least approximately tuned to the frequency of a supply 24. The supply has a high frequency and the lamp has a low thermal capacity heater 25 connected across a resistor 20. When the source 24 is switched on there is only a small damping of the series resonant circuit 18, 22 since resistors 19, 23 are small and since the resistor 20 is shunted by the heater 25. When the lamp strikes, its low impedance shunts a high resistance 16 and damps the tuned circuit causing the voltage to fall. A power factor correcting capacitor 14 limits the lamp current and a second heater 26 may be supplied by a transformer 28. The circuit is designed so that short circuits or breakage of the lamp heater cause de-tuning of the resonant circuit with a consequential reduction in the voltage. High energy sparks are therefore not produced so that the circuit is intrinsically safe and may be used in a hazardous atmosphere.
GB309471A 1971-11-18 1972-01-25 Circuits for supplying power to fluorescent lamps Expired GB1365922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB309471A GB1365922A (en) 1971-11-18 1972-01-25 Circuits for supplying power to fluorescent lamps

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5363371 1971-11-18
GB309471A GB1365922A (en) 1971-11-18 1972-01-25 Circuits for supplying power to fluorescent lamps

Publications (1)

Publication Number Publication Date
GB1365922A true GB1365922A (en) 1974-09-04

Family

ID=26238016

Family Applications (1)

Application Number Title Priority Date Filing Date
GB309471A Expired GB1365922A (en) 1971-11-18 1972-01-25 Circuits for supplying power to fluorescent lamps

Country Status (1)

Country Link
GB (1) GB1365922A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee