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
  • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
• • 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
  • H05B41/26—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
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

• the invention relates to an operating method for a high-pressure discharge lamp according to the preamble of patent claim 1.
• the published patent application EP 0 708 579 AI discloses an operating method for a high-pressure discharge lamp, in which the lamp is operated with a frequency-modulated alternating current.
• a metal halide high-pressure discharge lamp is operated with a frequency-modulated alternating current in order to excite acoustic resonances in a controlled manner to straighten the discharge arc, which is caused by convection.
• Patent specification EP 0 626 799 B1 describes the operation of a high-pressure discharge lamp with an alternating current, the frequency of which is tuned to a radial acoustic resonance in order to straighten the discharge arc which is curved due to convection.
• the frequency modulation of the lamp current in accordance with the above-cited published documents requires a considerable amount of circuitry.
• the operation of the high-pressure discharge lamp with an alternating current, the frequency of which is matched to a radial acoustic resonance, is also complex because, because of the manufacturing tolerances, a frequency tuning on the operating device is required for each lamp.
• the operation of the high-pressure discharge lamp with a rectangular current has the disadvantage that at high lamp currents, such as those are required for the operation of mercury-free metal halide high-pressure discharge lamps, not inconsiderable power loss occurs in the transistor switches and a comparatively high amount of radio interference is required due to broadband interference signals that are caused by the lamp.
• the operating method according to the invention is suitable for high-pressure discharge lamps, the discharge vessel of which surrounds a discharge space of essentially cylindrical geometry and in which electrodes and an ionizable filling for producing a light-emitting gas discharge are arranged, the aspect ratio, that is to say the quotient of the electrode spacing and inner diameter of the discharge vessel, preferably greater than 0.86 and particularly preferably even greater than 2.
• a discharge space of essentially cylindrical geometry is understood to mean that the inner wall of the discharge vessel is cylindrical, at least in the region of the gas discharge. According to the invention, such a high-pressure discharge lamp is operated with an essentially sinusoidal current at a frequency which is in a frequency range above 30 kilohertz and which is free of acoustic resonances.
• a high-pressure discharge lamp with the features described above in contrast to high-pressure discharge lamps with spherical or elliptical discharge vessels, have relatively large frequency ranges above 30 • kilohertz, which are free from acoustic resonances and for the stable Operation of the high pressure discharge lamp can be used.
• the high-pressure discharge lamp is therefore operated according to the invention with an essentially sinusoidal alternating current at a predeterminable frequency in such a frequency window without frequency modulation of the lamp current.
• the operating device can be considerably simplified by the operating method according to the invention. Compared to the operating method according to the published patent applications EP 0 708 579 AI and EP 0 386 990 A2, the part of the operating device required for frequency modulation is omitted.
• the operating method according to the invention allows less effort in radio interference suppression and less power loss at higher lamp currents, because the lamp does not generate any significant broadband interference signals with a sinusoidal lamp current.
• the high-pressure discharge lamp is preferably operated with a sinusoidal alternating current, the frequency of which lies in a frequency range between two adjacent acoustic resonances.
• a frequency range between two adjacent basic frequencies of acoustic resonances is particularly preferred, since when operating with a frequency from a correspondingly low frequency range for the lamp current, the ignition circuit and the radio interference suppression of the operating device can be designed in a simple manner.
• the aforementioned, resonance-free frequency range is wide enough to perform a power control of the high-pressure discharge lamp by changing the frequency of the lamp current.
• the high-pressure discharge lamp is preferably operated immediately after the ignition of the gas discharge with a power which is higher than the rated power, by applying a sinusoidal alternating current to the high-pressure discharge lamp, the frequency of which is reduced in comparison with the frequency of the lamp alternating current during the stationary operating state.
• a different, for example a higher, frequency is set for the lamp current than during the ignition phase.
• the figure shows a schematic representation of a high-pressure discharge lamp which is suitable for the operating method according to the invention and on the basis of which the operating method according to the invention is described by way of example.
• This lamp is a mercury-free high-pressure discharge lamp with a power consumption of 25 watts to 35 watts, which is intended for use in a motor vehicle headlight.
• the discharge vessel 1 of this lamp has a tubular, cylindrical middle section 10, which consists of sapphire.
• the open ends of section 10 are each closed by a ceramic closure piece 11 or 12 made of polycrystalline aluminum oxide.
• the inner diameter of the circular cylindrical section 10 is 1.5 millimeters.
• Two electrodes 2, 3 are arranged in the longitudinal axis of the discharge vessel 1, so that their discharge-side ends protrude into the interior of the central, cylindrical section 10 and are at a distance of 4.2 millimeters.
• the ionizable filling enclosed in the discharge vessel 1 consists of xenon with a cold filling pressure of 5000 hectopascals and a total of 4 milligrams of the iodides of sodium, dysprosium, holmium, thulium and thallium.
• the electrodes 2 and 3 are each connected to an electrical connection 16 and 17 of the lamp base 15 via a power supply 4 and 5, respectively.
• the discharge vessel 1 is surrounded by a translucent outer bulb 14.
• the acoustic resonance frequencies of the high-pressure discharge lamp can be calculated from the electrode spacing, the inner diameter of the cylindrical section 10 and from the speed of sound in the discharge medium, which is approximately 560 m / s.
• the fundamental frequency of the longitudinal acoustic resonance is 70 kilohertz.
• the basic frequency of the azimuthal acoustic resonance is 230 kilohertz and the basic frequency of the radial acoustic resonance is 476 kilohertz. This means that the fundamental frequency of the aforementioned acoustic resonances in the discharge space is in each case caused by an alternating current with a frequency frequency that is half as large as that of the aforementioned resonances would be excited.
• the high-pressure discharge lamp is operated with a sinusoidal alternating current, the frequency of which lies either in the frequency range from 50 kilohertz to 100 kilohertz or in the frequency range from 150 kilohertz to 200 kilohertz, for example with a sinusoidal alternating current of 75 kilohertz or 175 kilohertz.
• the first-mentioned frequency range thus lies between the fundamental frequency of the longitudinal acoustic resonance, which is excited by an alternating current of 35 kilohertz, and the fundamental frequency of the azimuthal acoustic resonance, which is excited by an alternating current of 115 kilohertz.
• the second frequency range lies between the fundamental frequency of the azimuthal acoustic resonance, which is excited by an alternating current of 115 kilohertz, and the fundamental frequency of the radial acoustic resonance, which is excited by an alternating current of 238 kilohertz.
• the operating voltage of the high-pressure discharge lamp is approximately 30 volts to 50 volts and the effective value of the sinusoidal lamp current is approximately 0.6 amperes.
• the color temperature of the light emitted by the lamp is approximately 4000 Kelvin and the color rendering index is approximately 70.
• the operating method according to the invention can also be applied to the high-pressure discharge lamp disclosed in the published patent application DE 103 12 290. be applied.
• This lamp is a mercury-free metal halide high-pressure discharge lamp with an electrical power consumption of approximately 35 watts.
• This lamp is intended for use in a vehicle headlight. It has a two-sided sealed discharge vessel 30 made of quartz glass with a volume of 24 mm 3 , in which an ionizable filling is enclosed gas-tight and which is surrounded by an outer bulb. In the area of the discharge space, the inner contour of the discharge vessel is circular-cylindrical and its outer contour is ellipsoidal.
• the inside diameter of the discharge space is 2.6 mm and its outside diameter is 6.3 mm.
• the distance between the two lamp electrodes is 4.2 mm.
• the ionizable filling enclosed in the discharge vessel consists of xenon with a cold filling pressure of 11800 hPa, 0.25 mg sodium iodide, 0.18 mg scandium iodide, 0.03 mg zinc iodide and 0.0024 mg indium iodide.

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• Circuit Arrangements For Discharge Lamps (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (9)

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Family Cites Families (12)

• 2003
  • 2003-07-23 DE DE10333740A patent/DE10333740A1/de not_active Withdrawn
• 2004
  • 2004-07-19 JP JP2006520659A patent/JP2006528409A/ja not_active Withdrawn
  • 2004-07-19 KR KR1020067001496A patent/KR20060035780A/ko not_active Application Discontinuation
  • 2004-07-19 US US10/564,839 patent/US20070108913A1/en not_active Abandoned
  • 2004-07-19 EP EP04762413A patent/EP1647165A1/de not_active Ceased
  • 2004-07-19 CN CNA2004800212368A patent/CN1826842A/zh active Pending
  • 2004-07-19 CA CA002533255A patent/CA2533255A1/en not_active Abandoned
  • 2004-07-19 WO PCT/DE2004/001562 patent/WO2005011337A1/de not_active Application Discontinuation
  • 2004-07-21 TW TW093121735A patent/TW200511898A/zh unknown

Non-Patent Citations (1)

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