EP0752806A1 - Steuerungsanordnung für eine Gasentladungslampe - Google Patents

Steuerungsanordnung für eine Gasentladungslampe Download PDF

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Publication number
EP0752806A1
EP0752806A1 EP96110478A EP96110478A EP0752806A1 EP 0752806 A1 EP0752806 A1 EP 0752806A1 EP 96110478 A EP96110478 A EP 96110478A EP 96110478 A EP96110478 A EP 96110478A EP 0752806 A1 EP0752806 A1 EP 0752806A1
Authority
EP
European Patent Office
Prior art keywords
lamp
impedance
striking
ecu
extinguished
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Withdrawn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
EP96110478A
Other languages
English (en)
French (fr)
Inventor
Andrea Nepote
Dario Decurti
Oscar Blazic
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 EP0752806A1 publication Critical patent/EP0752806A1/de
Withdrawn legal-status Critical Current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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • H05B41/386—Controlling the intensity of light during the transitional start-up phase for speeding-up the lighting-up
    • 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
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting

Definitions

  • the present invention relates to a control device for a gas-discharge lamp, particularly for motor vehicles.
  • control device for a gas-discharge lamp comprising
  • a gas-discharge lamp Upon striking a gas-discharge lamp must be supplied with a high electric power which can cause rapid evaporation of the materials (metal halides, rare earths) contained within its interior. During this striking stage the electric power supplied to the lamp must also be suitably regulated in order to ensure that the light flux emitted has the desired characteristics.
  • the control unit which regulates the application of electric power to the lamp during striking must therefore have access to information about the time elapsed since the lamp was last extinguished.
  • control unit which is typically formed using a microprocessor, remains connected to the dc voltage supply source even when the lamp is extinguished.
  • This unit is, moreover, arranged to measure (for example by means of a counter) the time for which the lamp remains extinguished.
  • control unit regulates the electric power applied to the lamp on the basis of the time elapsed since it was last extinguished.
  • This arrangement has the disadvantage of having to have a specific connection between the voltage supply source and the control unit.
  • the object of the present invention is to provide a control device for a gas-discharge lamp which allows a differentiated control of such a lamp as a function of the time elapsed since it was last extinguished without requiring the control unit to be permanently supplied via a suitable supply line.
  • control device of the previously-specified type, characterised in that it further includes:
  • the invention is based on the observation that the impedance of the lamp measured immediately after its striking varies appreciably as a function of the time elapsed since the lamp was previously extinguished.
  • a gas-discharge lamp presents for example an impedance of about 200 Ohm if the striking follows immediately after the lamp has been extinguished, and an impedance of for example about 10 Ohm when the lamp is re-struck from cold, that is to say after a considerable time has elapsed since it was last extinguished.
  • the reference letter B indicates a low voltage dc source such as, for example, the battery on board a motor vehicle.
  • a dc/dc conversion circuit unit To the battery B is connected the input of a dc/dc conversion circuit unit generally indicated 1.
  • This circuit unit can comprise, for example, a dc/dc converter of the push-pull type and/or of other known types.
  • This circuit unit typically includes one or more electronic switches (not illustrated) which can be controlled in a pre-established manner by means of control signals applied to inputs 1a ... 1N of this unit.
  • an inverter generally indicated 2 which is connected to the gas-discharge lamp L.
  • the inverter 2 is of the totally controlled bridge type and includes four electronic switches S1-S4.
  • the lamp L is connected across one diagonal of the bridge circuit.
  • the secondary winding of a striking transformer TT is connected in series with this lamp.
  • An electronic control unit indicated ECU formed, for example, with the use of a microprocessor, is connected to the control inputs 1a-1N of the dc/dc conversion circuit unit 1 and to the control inputs of the electronic switches S1-S4 of the inverter 2.
  • a measurement resistor R is connected to the output of the circuit unit 1 in series with the bridge circuit of the inverter 2. The terminals of this resistor are connected to corresponding inputs of the electronic control unit ECU. In operation the resistor R allows the unit ECU to acquire information relating to the magnitude of the current flowing in the lamp L. This information can however be acquired from the unit ECU via other means or devices known per se.
  • the unit ECU is further connected to the upper and lower terminals of the bridge circuit of the inverter 2 by connections indicated 3 and 4, in such a way as to be able to acquire, during operation, information relating to the voltage applied to the lamp L. Also In this case, this Information may be acquired from the unit ECU in other known ways.
  • memory devices M Associated with the unit ECU are memory devices M of non-volatile type, preferably of the re-writable type.
  • the control unit ECU is arranged to acquire, at each striking of the lamp L, the voltage across the terminals of the resistor R which is indicative of the current flowing in the lamp, and the voltage across the terminals of the bridge of the inverter 2, which is indicative of the voltage applied to the lamp. On the basis of this information the unit ECU determines the impedance Z L of the lamp L at striking.
  • the unit ECU is therefore arranged to compare the thus-determined values of the impedance with the values stored in the memory devices M, and to determine on the basis of this comparison the time t off elapsed since the lamp L was last extinguished.
  • the control unit ECU therefore acts to control the dc/dc conversion circuit unit 1 and/or the inverter 2 in such a way that, immediately after the lamp L is struck, a variable electrical power is supplied to the lamp depending on a predetermined law stored in the said control unit, as a function of the time t off .
  • control of the striking of the lamp L is achievable by manual actuation of a control switch indicated S. Closure of this switch causes coupling of the dc/dc conversion unit 1 and the unit ECU to the dc supply voltage source B.
  • the unit ECU When the user opens the switch S to cause the lamp to be extinguished the unit ECU likewise no longer receives the supply voltage. However, thanks to the data stored in the non-volatile memory devices M and to the procedure for detection and comparison of the impedance presented by the lamp at striking the system is always able to perform a regulation of the electrical power applied to the lamp at striking as a function of the time elapsed since it was previously extinguished.
  • the memory devices M associated with the control unit ECU conveniently have stored therein data relating to the ratio between the impedance Z L of the lamp L at striking and the impedance Z LO of the said lamp during normal operation, upon variation of the time t off elapsed since the lamp was extinguished.
  • the control unit ECU is then correspondingly prearranged to acquire and store (in a non-volatile manner), during each striking period of the lamp L, the impedance presented by the said lamp during normal operation, and to determine at each striking of the lamp the ratio between the current impedance of the lamp at striking and the impedance of the lamp during normal operation in the preceding striking period.
  • the unit ECU compares the value of the thus-determined ratio with the values stored in the memory devices M and on the basis of this comparison determines the time t off elapsed since the lamp was previously extinguished.
  • Figure 2 is shown, by way of example, a graph based on the experimental detections made on a lamp.
  • This graph plots the variation of the ratio between the impedance Z L of a gas-discharge lamp at striking and the impedance Z LO of the same lamp during normal operation, plotted as a function of the elapsed time t off since it was extinguished.
  • Such a graph is stored in the memory devices M for example in the form of a table.
  • the variant of the invention now described allows a more precise regulation of the electrical power applied to the lamp L at striking as a function of the time elapsed since it was last extinguished.
  • the variant of the invention described above also makes it possible to render the control system of the lamp L self-adjusting, even in the case of possible replacement of the lamp L.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP96110478A 1995-07-06 1996-06-28 Steuerungsanordnung für eine Gasentladungslampe Withdrawn EP0752806A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000568A IT1276474B1 (it) 1995-07-06 1995-07-06 Dispositivo di controllo per una lampada a scarica di gas
ITTO950568 1995-07-06

Publications (1)

Publication Number Publication Date
EP0752806A1 true EP0752806A1 (de) 1997-01-08

Family

ID=11413704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110478A Withdrawn EP0752806A1 (de) 1995-07-06 1996-06-28 Steuerungsanordnung für eine Gasentladungslampe

Country Status (2)

Country Link
EP (1) EP0752806A1 (de)
IT (1) IT1276474B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0987928A1 (de) * 1998-09-15 2000-03-22 Quality Light Electronics S.A.S. Di Francesco Celso E C. Resonanzzündgerät für Entladungslampen
FR2824229A1 (fr) * 2001-02-26 2002-10-31 Koito Mfg Co Ltd Circuit d'allumage de lampe a decharge, notamment pour lampe d'automobile
WO2004089044A1 (en) * 2002-10-31 2004-10-14 Delta Power Supply Lamp conditioning system
EP1670294A3 (de) * 2004-12-07 2006-11-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Betriebsgerät und Verfahren zum Betreiben von Gasentladungslampen
CN121602415A (zh) * 2026-01-28 2026-03-03 华润电力(盘锦)有限公司 一种新能源基地调相机同步失稳分析方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648000A1 (fr) * 1989-06-02 1990-12-07 Koito Mfg Co Ltd Circuit d'allumage pour lampe a decharge sous haute pression pour vehicules
EP0459126A1 (de) * 1990-05-14 1991-12-04 Hella KG Hueck & Co. Verfahren und Einrichtung zum Starten einer Hochdruckgasentladungslampe in Kraftfahrzeugen
EP0536535A1 (de) * 1991-09-09 1993-04-14 Matsushita Electric Industrial Co., Ltd. Apparat zur Regelung des Leuchtens einer Entladungslampe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648000A1 (fr) * 1989-06-02 1990-12-07 Koito Mfg Co Ltd Circuit d'allumage pour lampe a decharge sous haute pression pour vehicules
EP0459126A1 (de) * 1990-05-14 1991-12-04 Hella KG Hueck & Co. Verfahren und Einrichtung zum Starten einer Hochdruckgasentladungslampe in Kraftfahrzeugen
EP0536535A1 (de) * 1991-09-09 1993-04-14 Matsushita Electric Industrial Co., Ltd. Apparat zur Regelung des Leuchtens einer Entladungslampe

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0987928A1 (de) * 1998-09-15 2000-03-22 Quality Light Electronics S.A.S. Di Francesco Celso E C. Resonanzzündgerät für Entladungslampen
US6191537B1 (en) 1998-09-15 2001-02-20 Quality Light Electronics S.A.S. Solid state resonance igniter for control of the number of high voltage pulses for hot restrike of discharge lamps
FR2824229A1 (fr) * 2001-02-26 2002-10-31 Koito Mfg Co Ltd Circuit d'allumage de lampe a decharge, notamment pour lampe d'automobile
WO2004089044A1 (en) * 2002-10-31 2004-10-14 Delta Power Supply Lamp conditioning system
EP1670294A3 (de) * 2004-12-07 2006-11-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Betriebsgerät und Verfahren zum Betreiben von Gasentladungslampen
US7248000B2 (en) 2004-12-07 2007-07-24 Patent-Treuhand-Gesellschaft für elektrisch Glühlampen mbH Operating device and method for operating gas discharge lamps
CN1802060B (zh) * 2004-12-07 2010-09-29 电灯专利信托有限公司 用于气体放电灯工作的工作装置和方法
CN121602415A (zh) * 2026-01-28 2026-03-03 华润电力(盘锦)有限公司 一种新能源基地调相机同步失稳分析方法及系统

Also Published As

Publication number Publication date
IT1276474B1 (it) 1997-10-31
ITTO950568A1 (it) 1997-01-06
ITTO950568A0 (it) 1995-07-06

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