EP0293138A1 - Lampes à sodium à basse pression - Google Patents

Lampes à sodium à basse pression Download PDF

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Publication number
EP0293138A1
EP0293138A1 EP88304564A EP88304564A EP0293138A1 EP 0293138 A1 EP0293138 A1 EP 0293138A1 EP 88304564 A EP88304564 A EP 88304564A EP 88304564 A EP88304564 A EP 88304564A EP 0293138 A1 EP0293138 A1 EP 0293138A1
Authority
EP
European Patent Office
Prior art keywords
lamp
circuit
discharge lamp
high frequency
pressure sodium
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.)
Withdrawn
Application number
EP88304564A
Other languages
German (de)
English (en)
Inventor
Sydney Alfred Rigden
Karam Hussain Malik
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.)
Ledvance Ltd
Original Assignee
Osram GEC 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 Osram GEC Ltd filed Critical Osram GEC Ltd
Publication of EP0293138A1 publication Critical patent/EP0293138A1/fr
Withdrawn legal-status Critical Current

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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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2925—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/22—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent vapour of an alkali metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium

Definitions

  • the present invention relates to low pressure sodium vapour electric discharge lamps, that is to say, lamps of the kind consisting of a sealed elongate discharge tube, containing metallic sodium and a rare gas filling under low pressure, held within a cylindrical outer bulb having on its inner surface a coating transparent to sodium emission but a good reflector of infra-red radiation.
  • the rare gas filling used in the discharge tube is commonly in the form of a mixture comprising 99% neon and 1% argon.
  • the argon is included since it has a lower excitation potential than neon. This Penning mixture of neon and argon thereby reduces the voltage necessary for igniting the lamp.
  • a common cause of lamp failure is argon clean up which results in a gradual increase in the lamp starting voltage and eventual failure to start.
  • a low-pressure sodium vapour electric discharge lamp of the kind referred to has a discharge tube filling consisting of neon alone and is connected into a circuit capable of supplying a high frequency current to the lamp.
  • an operating circuit for a low pressure sodium vapour electric discharge lamp comprises a pair of input terminals for connection to an alternating current mains supply, a pair of output terminals for connection to the terminals of a low pressure sodium vapour electric discharge lamp of the kind referred to, and means for deriving from the alternating current mains supply an output frequency in the range 40 to 200kHz at the output terminals, sufficient to start and operate the lamp.
  • the circuit can also be used to operate lamps having the conventional filling of neon and argon, and whilst, in such a case, the lamps will be subject to the usual argon clean up, this will not significantly affect the lamp operation in the circuit.
  • the outer bulb of the lamp may be evacuated.
  • the inner surface of the outer bulb which has an infra-red reflecting film is also coated with a silica anti-reflection film to improve the light output of the lamp. Experiments have shown that this improvement can be of the order of 4-5%.
  • the frequencies generated by the lamp operating circuits in accordance with the invention may cause interference in certain radio wavebands.
  • an inductance/capacitance network may be incorporated into the supply circuit.
  • FIG. 1 A circuit capable of supplying a high frequency current to a sodium lamp in accordance with the invention is shown in Figure 1 by way of example only.
  • the circuit includes a pair of input terminals T for connecting a bridge rectifier B and a smoothing circuit, provided by a capacitor CI and a resistor R1, to an alternating current mains supply.
  • the resistor R1 limits the charging current of capacitance C1.
  • the rectified output from the bridge rectifier and smoothing circuit is applied to a sawtooth generator, provided by a resistor R2, a capacitor C2 and a diac D2, which acts as a trigger to start the circuit.
  • a sawtooth generator provided by a resistor R2, a capacitor C2 and a diac D2, which acts as a trigger to start the circuit.
  • the capacitance C2 is charged via R2.
  • capacitance C2 passes a short current pulse into the gate circuit of a transistor T2 thus charging the gate capacitance.
  • a capacitor C5 connected across the lamp L, and an inductance L1 in series with the lamp L provide a resonant circuit which is triggered into resonance by the sawtooth generator circuit, so as to apply a high frequency voltage across the lamp.
  • the transistor T2 only carries current when diac D2 triggers and then the high frequency self resonance begins (due to feedback via inductances L3 and L4).
  • the sawtooth generator shuts down via diode D1 which effectively prevents the diac D2 reaching its breakdown voltage.
  • the oscillator circuit will shut down, should the fuse F fail for any reason.
  • the high frequency current through the lamp is around 0.5 amps; the circuit may be used to supply a current of up to 200kHz to a 90 or 135 watt lamp.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP88304564A 1987-05-29 1988-05-20 Lampes à sodium à basse pression Withdrawn EP0293138A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8712665 1987-05-29
GB878712665A GB8712665D0 (en) 1987-05-29 1987-05-29 Low pressure sodium lamps

Publications (1)

Publication Number Publication Date
EP0293138A1 true EP0293138A1 (fr) 1988-11-30

Family

ID=10618119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88304564A Withdrawn EP0293138A1 (fr) 1987-05-29 1988-05-20 Lampes à sodium à basse pression

Country Status (3)

Country Link
EP (1) EP0293138A1 (fr)
JP (1) JPS63301492A (fr)
GB (2) GB8712665D0 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6031339A (en) * 1999-01-03 2000-02-29 Hewlett-Packard Company Efficient electronic ballast for fluorescent tubes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1539514A1 (de) * 1966-08-05 1969-11-06 Patra Patent Treuhand Natrium-Niederdruck-Entladungslampe mit Grundgasfuellung
US4544863A (en) * 1984-03-22 1985-10-01 Ken Hashimoto Power supply apparatus for fluorescent lamp
EP0191537A1 (fr) * 1985-02-15 1986-08-20 Koninklijke Philips Electronics N.V. Lampe à décharge à sodium à basse pression

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL38736C (fr) * 1933-11-04
US2025585A (en) * 1934-07-07 1935-12-24 Gen Electric Method of operating vapor electric lamps
GB448585A (en) * 1935-05-21 1936-06-11 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Improvements in electric discharge devices
GB955656A (en) * 1959-05-19 1964-04-15 A E I Lamp And Lighting Compan Operation of electric discharge lamps
GB1189983A (en) * 1966-07-13 1970-04-29 Gavaert Agfa N V Apparatus for Copying Graphic Originals
GB2110890B (en) * 1981-12-07 1985-06-26 Krauss Innovatron Frequency controlled excitation of a gas discharge lamp
NL8205026A (nl) * 1982-12-29 1984-07-16 Philips Nv Inrichting voorzien van een met tenminste twee inwendige elektroden uitgeruste metaaldampontladingsbuis.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1539514A1 (de) * 1966-08-05 1969-11-06 Patra Patent Treuhand Natrium-Niederdruck-Entladungslampe mit Grundgasfuellung
US4544863A (en) * 1984-03-22 1985-10-01 Ken Hashimoto Power supply apparatus for fluorescent lamp
EP0191537A1 (fr) * 1985-02-15 1986-08-20 Koninklijke Philips Electronics N.V. Lampe à décharge à sodium à basse pression

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEE PROCEEDINGS, vol. 128, no. 6, part A, September 1981, pages 397-414, Old Woking, Surrey, GB; J.W. DENNEMAN: "Low-pressure sodium discharge lamps" *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 69 (E-389)[2126], 18th March 1986, page 45 E 389; & JP-A-60 218 761 (CANON K.K.) 01-11-1985 *

Also Published As

Publication number Publication date
GB2205197A (en) 1988-11-30
GB8712665D0 (en) 1987-07-01
JPS63301492A (ja) 1988-12-08
GB8806215D0 (en) 1988-04-13

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