EP0891123A1 - A device for operating a gas-discharge lamp, particularly for motor vehicles - Google Patents

A device for operating a gas-discharge lamp, particularly for motor vehicles Download PDF

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Publication number
EP0891123A1
EP0891123A1 EP98112781A EP98112781A EP0891123A1 EP 0891123 A1 EP0891123 A1 EP 0891123A1 EP 98112781 A EP98112781 A EP 98112781A EP 98112781 A EP98112781 A EP 98112781A EP 0891123 A1 EP0891123 A1 EP 0891123A1
Authority
EP
European Patent Office
Prior art keywords
lamp
ignitor
transformer
winding
filter means
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Withdrawn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
EP98112781A
Other languages
German (de)
French (fr)
Inventor
Andrea Nepote
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.)
Marelli Europe SpA
Original Assignee
Magneti Marelli SpA
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 Magneti Marelli SpA filed Critical Magneti Marelli SpA
Publication of EP0891123A1 publication Critical patent/EP0891123A1/en
Withdrawn legal-status Critical Current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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • 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

Definitions

  • the present invention relates to a device for operating a gas-discharge lamp, particularly for use in motor-vehicle headlamps or lights.
  • control device comprising:
  • FIG. 1 A known device of this type is shown schematically in Figure 1 of the appended drawings.
  • the gas-discharge lamp is indicated L and the associated operating device comprises a ballast circuit B connected to an ignitor circuit I.
  • a filter F is interposed between the ignitor I and the lamp.
  • the filter F is a high-frequency filter with two inductors in series with the conductors which connect the ignitor to the lamp, and with two capacitors in parallel with these conductors.
  • the components of the filter F serve solely and exclusively for performing the filtering action which is directed towards limiting the emission of interference and all of these components are for operating at high voltages and are therefore quite expensive.
  • the object of the present invention is to provide a device for operating a gas-discharge lamp in which filtering to prevent interference radiation is achieved with a reduced number of additional components.
  • the filter means comprise, as the inductive component, the secondary winding of the transformer of the ignitor.
  • the secondary winding of the transformer comprises two winding portions and the filter means also comprise two capacitors connected between the opposite ends of these winding portions.
  • the ignitor I comprises a transformer T, particularly of the type known as a Tesla transformer.
  • the transformer T comprises a primary winding W1 connected to the ballast circuit B. In series with the primary winding W1 of the transformer T there is a discharge device SC.
  • the transformer T has a secondary winding comprising two winding portions W21 and W22.
  • the winding portion W21 has one end connected to the lamp L and the other end connected to one end of the winding portion W22 via a capacitor C1.
  • the other end of the winding portion W22 is connected to the lamp L.
  • a second capacitor C2 connected to the winding portions W21 and W22 in a manner such as to be substantially in parallel with the lamp L.
  • the transformer T with the secondary winding split into two portions and the ways in which these portions are connected to the capacitors C1 and C2 enable these winding portions to be used synergically both for applying the extra-high starting voltage to the lamp L, and as inductive components of a high-frequency filter for reducing the emission of interference.
  • the circuit formed by the capacitors C1, C2 and by the winding portions W21 and W22 corresponds to the circuit of the filter F according to the prior art.
  • a first structural solution may consist in the mounting of the entire ignitor I in the lamp-holder associated with the lamp.
  • At least the high-voltage capacitor C2 may be incorporated in the lamp-holder associated with the lamp L whilst the rest of the ignitor I may be formed as a structurally separate unit connected to the high-voltage capacitor C2 by means of a pair of insulated conductors.
  • the ignitor I and the associated filter capacitors may be physically incorporated in the base of the lamp.
  • Figure 3 shows a particularly advantageous embodiment of the transformer T.
  • the transformer T comprises a magnetic core MC on which the primary winding W1 is wound, this winding being formed, for example, by a single turn wound with a long pitch.
  • the two winding portions W21 and W22 which form the secondary side of the transformer are wound on top of one another on the core MC on top of the primary winding W1.
  • Each of these winding portions is advantageously constituted by a single layer of turns of conductive wire.
  • this stray capacitance is a capacitance in parallel and therefore also contributes to the filtering effect.

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  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Filters And Equalizers (AREA)

Abstract

The device comprises an ignitor (I) including a transformer (T) the secondary winding (W21, W22) of which is connected to the lamp (L) in order to apply a high starting voltage thereto upon ignition, and a filter circuit (F) comprising an inductive component and connected to the lamp (L) to prevent the emission of interference signals. The filter circuit comprises, as the inductive component, the secondary winding (W21, W22) of the transformer (T) of the ignitor (I).

Description

The present invention relates to a device for operating a gas-discharge lamp, particularly for use in motor-vehicle headlamps or lights.
More specifically, the subject of the invention is a control device comprising:
  • an ignitor including a transformer the secondary winding of which is connected to the lamp in order to apply a high starting voltage thereto upon ignition, and
  • filter means comprising an inductive component and connected to the lamp to prevent the emission of interference signals.
    • A known device of this type is shown schematically in Figure 1 of the appended drawings. In this drawing, the gas-discharge lamp is indicated L and the associated operating device comprises a ballast circuit B connected to an ignitor circuit I.
    In the device according to the prior art shown in Figure 1, to prevent the emission of interference signals, a filter F is interposed between the ignitor I and the lamp. The filter F is a high-frequency filter with two inductors in series with the conductors which connect the ignitor to the lamp, and with two capacitors in parallel with these conductors.
    In the device of Figure 1, the components of the filter F serve solely and exclusively for performing the filtering action which is directed towards limiting the emission of interference and all of these components are for operating at high voltages and are therefore quite expensive.
    The object of the present invention is to provide a device for operating a gas-discharge lamp in which filtering to prevent interference radiation is achieved with a reduced number of additional components.
    This and other objects are achieved according to the invention by a device of the type specified above, characterized in that the filter means comprise, as the inductive component, the secondary winding of the transformer of the ignitor.
    Advantageously, according to a further characteristic of the invention, the secondary winding of the transformer comprises two winding portions and the filter means also comprise two capacitors connected between the opposite ends of these winding portions.
    In this solution only the capacitor connected between the ends of the portions of the secondary winding which are connected to the lamp has to be of the high-voltage type.
    Further characteristics and advantages of the invention will become clear from the following detailed description, given purely by way of non-limiting example, with reference to the appended drawings, in which:
  • Figure 1, which has already been described, is a schematic view of a device according to the prior art,
  • Figure 2 is a circuit diagram of a device according to the invention, and
  • Figure 3 is a schematic view of a transformer used in an ignitor and filter device according to the invention.
    • With reference to Figure 2, the ignitor I comprises a transformer T, particularly of the type known as a Tesla transformer.
    The transformer T comprises a primary winding W1 connected to the ballast circuit B. In series with the primary winding W1 of the transformer T there is a discharge device SC.
    In the device of Figure 2, the transformer T has a secondary winding comprising two winding portions W21 and W22.
    The winding portion W21 has one end connected to the lamp L and the other end connected to one end of the winding portion W22 via a capacitor C1. The other end of the winding portion W22 is connected to the lamp L.
    In the ignitor I there is a second capacitor C2 connected to the winding portions W21 and W22 in a manner such as to be substantially in parallel with the lamp L.
    The particular construction of the transformer T with the secondary winding split into two portions and the ways in which these portions are connected to the capacitors C1 and C2 enable these winding portions to be used synergically both for applying the extra-high starting voltage to the lamp L, and as inductive components of a high-frequency filter for reducing the emission of interference. In fact, it can easily be seen that, topologically, the circuit formed by the capacitors C1, C2 and by the winding portions W21 and W22 corresponds to the circuit of the filter F according to the prior art.
    The solution shown in Figure 2 thus achieves a saving of two inductors in comparison with the prior art. It also makes it possible to use only one high-voltage capacitor (the capacitor C2), whereas the other capacitor (C1) operates at low voltage.
    From a constructional point of view, it is generally advantageous to position the filter as close as possible to the lamp L. Accordingly, a first structural solution may consist in the mounting of the entire ignitor I in the lamp-holder associated with the lamp.
    Alternatively, at least the high-voltage capacitor C2 may be incorporated in the lamp-holder associated with the lamp L whilst the rest of the ignitor I may be formed as a structurally separate unit connected to the high-voltage capacitor C2 by means of a pair of insulated conductors.
    As a further alternative, the ignitor I and the associated filter capacitors may be physically incorporated in the base of the lamp.
    Figure 3 shows a particularly advantageous embodiment of the transformer T.
    In this embodiment, the transformer T comprises a magnetic core MC on which the primary winding W1 is wound, this winding being formed, for example, by a single turn wound with a long pitch.
    The two winding portions W21 and W22 which form the secondary side of the transformer are wound on top of one another on the core MC on top of the primary winding W1. Each of these winding portions is advantageously constituted by a single layer of turns of conductive wire.
    In this solution there is a stray capacitance between one turn and another in each secondary winding portion. However, since the various stray capacitances are in series with one another, the total resulting stray capacitance series is extremely low.
    As a result of the superimposition of the winding portions forming the secondary, there is in fact a further stray capacitance between these portions. Moreover, in the topological layout of the filter, this stray capacitance is a capacitance in parallel and therefore also contributes to the filtering effect.
    Naturally, the principle of the invention remaining the same, the forms of embodiment and details of construction may be varied widely with respect to those described and illustrated purely by way of non-limiting example, without thereby departing from the scope of the present invention as defined in the appended claims.

    Claims (7)

    1. A device for operating a gas-discharge lamp (L), particularly for motor vehicles, comprising:
      an ignitor (I) including a transformer (T) the secondary winding (W21, W22) of which is connected to the lamp (L) in order to apply thereto a high starting voltage upon ignition, and
      filter means (F) comprising an inductive component and connected to the lamp (L) to prevent the emission of interference signals,
      the device being characterized in that the filter means comprise, as the inductive component, the secondary winding (W21, W22) of the transformer (T) of the ignitor (I).
    2. A device according to Claim 2, characterized in that the secondary winding of the transformer (T) comprises two winding portions (W21, W22) and the filter means comprise two capacitors (C1, C2) connected between the opposite ends of the winding portions (W21, W22).
    3. A device according to Claim 2, characterized in that it comprises a high-voltage capacitor (C2) connected between the ends of the winding portions (W21, W22) between which the lamp (L) is connected.
    4. A device according to Claim 2 or Claim 3, characterized in that each winding portion (W21, W22) is formed by a single layer of turns around a magnetic core (MC), the layer of turns forming one portion (W21) being disposed around the layer of turns forming the other portion (W22).
    5. A device according to any one of the preceding claims, characterized in that the ignitor (I) and the filter means (W21, W22, C1, C2) are mounted in the lamp-holder associated with the lamp (L).
    6. A device according to Claim 3, characterized in that the high-voltage capacitor (C2) is mounted in the lamp-holder associated with the lamp (L).
    7. A device according to any one of Claims 1 to 3, characterized in that the ignitor (I) and the associated filter means (C2, C2) are physically incorporated in the base of the lamp (L).
    EP98112781A 1997-07-11 1998-07-09 A device for operating a gas-discharge lamp, particularly for motor vehicles Withdrawn EP0891123A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    IT97TO000628A IT1293443B1 (en) 1997-07-11 1997-07-11 CONTROL DEVICE FOR A GAS DISCHARGE LAMP, PARTICULARLY FOR VEHICLES.
    ITTO970628 1997-07-11

    Publications (1)

    Publication Number Publication Date
    EP0891123A1 true EP0891123A1 (en) 1999-01-13

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98112781A Withdrawn EP0891123A1 (en) 1997-07-11 1998-07-09 A device for operating a gas-discharge lamp, particularly for motor vehicles

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    EP (1) EP0891123A1 (en)
    IT (1) IT1293443B1 (en)

    Cited By (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0933977A2 (en) * 1998-01-31 1999-08-04 Hella KG Hueck & Co. Device for igniting and operating a high pressure discharge lamp in a vehicle
    EP0933975A2 (en) * 1998-01-31 1999-08-04 Hella KG Hueck & Co. Ignition transformer
    WO2000069224A1 (en) * 1999-05-07 2000-11-16 Koninklijke Philips Electronics N.V. Ignitor for high intensity discharge lamps
    EP1056315A2 (en) * 1999-05-26 2000-11-29 Hella KG Hueck & Co. Circuit for operating AC high pressure discharge lamps for a vehicle
    EP1056314A2 (en) * 1999-05-26 2000-11-29 Hella KG Hueck & Co. Circuit for operating AC high pressure discharge lamps for a vehicle
    EP1077590A2 (en) * 1999-08-19 2001-02-21 VOGT electronic AG High voltage starting module
    WO2004043118A1 (en) * 2002-11-04 2004-05-21 Koninklijke Philips Electronics N.V. Igniting pulse booster circuit
    WO2006026943A1 (en) * 2004-08-31 2006-03-16 Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh Method for operation of a high pressure discharge lamp operating device for a high pressure discharge lamp and high pressure discharge lamp with an operating device
    WO2007138507A1 (en) * 2006-05-31 2007-12-06 Koninklijke Philips Electronics N.V. Method and system for operating a gas discharge lamp
    EP1971192A3 (en) * 2007-03-15 2012-06-27 Vossloh-Schwabe Deutschland GmbH Control gear with improved EMC compliance

    Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5055747A (en) * 1990-07-20 1991-10-08 Intent Patents A.G. Self-regulating, no load protected electronic ballast system
    WO1992009183A1 (en) * 1990-11-14 1992-05-29 Neon Dynamics Corporation Switching excitation supply for argon-mercury discharge tubes
    GB2276714A (en) * 1993-03-30 1994-10-05 Bosch Gmbh Robert Headlight for vehicles
    DE19624724A1 (en) * 1995-06-29 1997-01-09 Valeo Vision EMC filter unit e.g. for motor vehicle discharge-type headlamp connector
    DE19645752A1 (en) * 1995-11-06 1997-05-15 Koito Mfg Co Ltd Discharge lamp e.g. headlamp for motor vehicle
    DE19610388A1 (en) * 1996-03-16 1997-09-18 Bosch Gmbh Robert Ignition device e.g. for discharge lamp of motor vehicle

    Patent Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5055747A (en) * 1990-07-20 1991-10-08 Intent Patents A.G. Self-regulating, no load protected electronic ballast system
    WO1992009183A1 (en) * 1990-11-14 1992-05-29 Neon Dynamics Corporation Switching excitation supply for argon-mercury discharge tubes
    GB2276714A (en) * 1993-03-30 1994-10-05 Bosch Gmbh Robert Headlight for vehicles
    DE19624724A1 (en) * 1995-06-29 1997-01-09 Valeo Vision EMC filter unit e.g. for motor vehicle discharge-type headlamp connector
    DE19645752A1 (en) * 1995-11-06 1997-05-15 Koito Mfg Co Ltd Discharge lamp e.g. headlamp for motor vehicle
    DE19610388A1 (en) * 1996-03-16 1997-09-18 Bosch Gmbh Robert Ignition device e.g. for discharge lamp of motor vehicle

    Cited By (17)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0933977A3 (en) * 1998-01-31 2001-01-10 Hella KG Hueck & Co. Device for igniting and operating a high pressure discharge lamp in a vehicle
    EP0933975A2 (en) * 1998-01-31 1999-08-04 Hella KG Hueck & Co. Ignition transformer
    EP0933975A3 (en) * 1998-01-31 2000-11-02 Hella KG Hueck & Co. Ignition transformer
    EP0933977A2 (en) * 1998-01-31 1999-08-04 Hella KG Hueck & Co. Device for igniting and operating a high pressure discharge lamp in a vehicle
    WO2000069224A1 (en) * 1999-05-07 2000-11-16 Koninklijke Philips Electronics N.V. Ignitor for high intensity discharge lamps
    EP1056315A3 (en) * 1999-05-26 2001-09-12 Hella KG Hueck & Co. Circuit for operating AC high pressure discharge lamps for a vehicle
    EP1056314A2 (en) * 1999-05-26 2000-11-29 Hella KG Hueck & Co. Circuit for operating AC high pressure discharge lamps for a vehicle
    EP1056315A2 (en) * 1999-05-26 2000-11-29 Hella KG Hueck & Co. Circuit for operating AC high pressure discharge lamps for a vehicle
    EP1056314A3 (en) * 1999-05-26 2001-09-12 Hella KG Hueck & Co. Circuit for operating AC high pressure discharge lamps for a vehicle
    EP1077590A2 (en) * 1999-08-19 2001-02-21 VOGT electronic AG High voltage starting module
    EP1077590A3 (en) * 1999-08-19 2001-12-12 VOGT electronic AG High voltage starting module
    WO2004043118A1 (en) * 2002-11-04 2004-05-21 Koninklijke Philips Electronics N.V. Igniting pulse booster circuit
    US7378803B2 (en) 2002-11-04 2008-05-27 Koninklijke Philips Electronics N. V. Igniting pulse booster circuit
    CN1709014B (en) * 2002-11-04 2011-07-06 皇家飞利浦电子股份有限公司 Igniting pulse booster circuit
    WO2006026943A1 (en) * 2004-08-31 2006-03-16 Patent-Treuhand- Gesellschaft Für Elektrische Glühlampen Mbh Method for operation of a high pressure discharge lamp operating device for a high pressure discharge lamp and high pressure discharge lamp with an operating device
    WO2007138507A1 (en) * 2006-05-31 2007-12-06 Koninklijke Philips Electronics N.V. Method and system for operating a gas discharge lamp
    EP1971192A3 (en) * 2007-03-15 2012-06-27 Vossloh-Schwabe Deutschland GmbH Control gear with improved EMC compliance

    Also Published As

    Publication number Publication date
    ITTO970628A1 (en) 1999-01-11
    IT1293443B1 (en) 1999-03-01

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