EP0811306A1 - Starter for a high-pressure gas-discharge lamp - Google Patents

Starter for a high-pressure gas-discharge lamp

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Publication number
EP0811306A1
EP0811306A1 EP96945836A EP96945836A EP0811306A1 EP 0811306 A1 EP0811306 A1 EP 0811306A1 EP 96945836 A EP96945836 A EP 96945836A EP 96945836 A EP96945836 A EP 96945836A EP 0811306 A1 EP0811306 A1 EP 0811306A1
Authority
EP
European Patent Office
Prior art keywords
capacitor
voltage
ignition device
ignition
charged
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.)
Granted
Application number
EP96945836A
Other languages
German (de)
French (fr)
Other versions
EP0811306B1 (en
Inventor
Ulrich Drews
Bernd Rothfuss
Thomas Kienzler
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 Automotive Lighting Reutlingen Germany GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0811306A1 publication Critical patent/EP0811306A1/en
Application granted granted Critical
Publication of EP0811306B1 publication Critical patent/EP0811306B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the invention relates to an ignition device for a
  • High-pressure gas discharge lamp in particular for use in headlights of motor vehicles, of the type defined in the preamble of claim 1.
  • an ignition transformer is provided, the primary winding of which a voltage is supplied.
  • the secondary winding transforms this voltage up to the voltage required to ignite the lamp.
  • a capacitor is arranged on the primary side in parallel with the series connection of the primary winding and a controllable switch, which is formed, for example, by a thyristor. This capacitor is charged for ignition to an effective voltage which is then present at this point in time. When a certain voltage is reached, the controllable switch is turned on and the capacitor is discharged to deliver the ignition pulse.
  • the ignition device according to the invention for a high-pressure gas discharge lamp with the characterizing features of claim 1 has the advantage of improving the takeover behavior, since in the critical area of takeover of the high pressure gas discharge lamp energy can be replenished from the ignition mode to the burning mode. This advantageously takes place in such a way that the capacitor discharge according to the invention does not have to provide the entire ignition energy at a high voltage level. This enables economical use of space when using cheaper and smaller components. This leads to both space and cost savings.
  • this is achieved according to the invention in that a second capacitor in series with a diode is provided in parallel with the capacitor, in that this second capacitor can be charged to a lower voltage than the first capacitor, and in that this second capacitor is then connected via the correspondingly polarized diode and the connected controllable switch is discharged into the primary winding when its voltage has become greater than that of the first capacitor when it is discharged.
  • the capacitance of the second capacitor is approximately 2 to 5 times as large as the capacitance of the first capacitor.
  • the voltage charging the first capacitor is large, preferably approximately 2 to 5 times as large as the voltage charging the second capacitor.
  • the first capacitor can be charged by a separately supplied voltage. This can also be referred to as the 3-letter concept.
  • the other which can be described as a 2-wire concept, consists in the fact that the second capacitor can be charged by an internally obtained voltage, which is preferably smaller by the voltage difference of a Zener diode than the voltage with which the first capacitor can be charged.
  • resistors are provided in series with the two capacitors, with the aid of which the time constants for charging the capacitors, taking into account the energy required to ignite the high-pressure gas discharge lamp and to transfer it to the burning mode is so selectable that the desired voltage is reached on the second capacitor when the controllable switch closes.
  • controllable switch is a spark gap, which switches through when a certain voltage is reached.
  • a voltage limiting element for. B. a varistor provided.
  • Fig. 1 shows a first exemplary embodiment of the ignition device designed according to the 3-Le ⁇ ter concept
  • Fig. 2 shows a second embodiment of the ignition device designed according to the invention according to the 2-Le ⁇ ter concept.
  • Fig. 1 a first embodiment of the ignition device designed according to the invention is shown, which is constructed according to the so-called 3-wire concept.
  • a high-pressure gas discharge lamp 10 is on one side via a secondary winding 16
  • Ignition transformer 14 connected to a first connecting line 11 of a power supply circuit, not shown in detail.
  • the second side of the high-pressure gas discharge lamp 10 is connected to a second connecting line 12 of the power supply circuit.
  • a first voltage ui is present between the connecting lines 11 and 12.
  • a third connecting line 13 supplies a further voltage U 2 between the connections 11 and 13. Via these three connecting lines, the high pressure gas discharge lamp 10 is supplied with both combustion and ignition energy.
  • the ignition energy is applied by the ignition device designed according to the invention with the aid of a pulse.
  • the ignition transformer 14 with a primary winding 15 and the secondary winding 16, which are closely coupled, Mistake.
  • a spark gap 17 is provided as an inexpensive controllable switch which suddenly becomes conductive when the breakdown voltage is reached, thus generating the firing pulse and allowing the current to flow through the primary winding 15.
  • first capacitor 18 Series connection of primary winding 15 and spark gap 17 is arranged em first capacitor 18. This first capacitor 18 is connected in series with a resistor 20 between the connecting lines 11 and 13 and is thus charged by the voltage U. In parallel with the first capacitor 18
  • a second capacitor 19 and a diode 22 Series connection of a second capacitor 19 and a diode 22 is provided.
  • the connection point of the capacitor 19 and the diode 22 is connected to the connecting line 12 via a resistor 21.
  • This second capacitor 19 is therefore in series with the resistor 21 between the connecting lines 11 and 12 and is thus charged by the voltage U1.
  • the diode 22 is poled so that its anode is connected to the connection point of the second capacitor 19 and the resistor 21, and that its cathode is connected to the connection point of the first capacitor 18 and the resistor 20, as well as the one connection of the spark gap 17 .
  • a varistor 23 is arranged between the connecting lines 11 and 12.
  • the mode of operation of the above-described embodiment of the ignition device designed according to the invention is as follows. About the applied voltage U t on the connecting line 13, which is only used during the ignition and therefore as
  • the first capacitor 18 is charged via the resistor 20 until the spark gap 17 breaks down.
  • the voltage U * present between the connecting lines 11 and 12 charges . , which supplies the takeover voltage and later the operating voltage of the high-pressure gas discharge lamp 10, via the resistor 21 to the second capacitor 19.
  • the voltage U is always in this phase greater than the voltage U ;
  • An advantageous ratio for the voltages provides that U 2 is approximately 2 to 5 times as large as the voltage U- . , As a result, the diode 22 is blocked.
  • Capacitor falls below the value U c2 on the second capacitor 19, also the energy stored in the second capacitor 19, in addition to the energy stored in the first capacitor 18, is available and via the primary winding 15, highly transformed by means of the secondary winding 16, simultaneously and then jointly to the High pressure gas discharge lamp 10 is emitted.
  • the energy required after the high-pressure gas discharge lamp 10 has broken down during the transition from the ignition of the arc to the burning mode is thus replenished according to the invention by the staggered capacitor discharge to a substantially lower voltage level.
  • 2 shows a second exemplary embodiment of the ignition device designed according to the invention, which is constructed according to the so-called 2-wire concept.
  • a high-pressure gas discharge lamp 210 is connected on one side via a secondary winding 216 of an ignition transformer 214 to a first connecting line 211 of a power supply circuit, not shown in detail.
  • the second side of the high-pressure gas discharge lamp 210 is connected to a second connecting line 212 of the power supply circuit.
  • the high-pressure gas discharge lamp 210 is supplied with both combustion and ignition energy via these two connecting lines.
  • the ignition energy is applied by the ignition device designed according to the invention with the aid of a pulse.
  • the ignition transformer 214 is provided with a primary winding 215 and the secondary winding 216, which are closely coupled to one another.
  • a spark gap 217 is provided as a controllable switch which suddenly becomes conductive when the breakdown voltage is reached, thus generating the firing pulse and permitting the current to flow through the primary winding 215.
  • a first capacitor 218 is arranged in parallel with the series connection of primary winding 215 and spark gap 217. This first capacitor 218 is in series with a resistor 220 between the
  • connection lines 211 and 212 and is thus charged by the voltage O ⁇ .
  • the series connection of a second capacitor 219 and a diode 222 is provided in parallel with the first capacitor 218.
  • the connection point of capacitor 219 and diode 222 is connected to the connecting line 212 via the series connection of a resistor 224 and a Zener diode 225 and the resistor 220.
  • At the point of connection of this second capacitor 219 to the diode 222 there is an internally generated voltage U 2 which is lower than the voltage Uj by the voltage of the Zener diode 225.
  • Diode 222 is poled so that its anode is connected to the junction of second capacitor 219 and resistor 224, and its Cathode is connected to the connection point of the first capacitor 218 and the resistor 220, and the one connection of the spark gap 217.
  • a voltage limiting element 223, for. B. em varistor arranged.
  • the embodiment of the ignition device designed according to the invention is as follows, only the one deviating from the first embodiment being described here.
  • the charge of the second capacitor 219 to the voltage level U c -> takes place with the help of a part of the voltage U-.,
  • the internally generated voltage U_. This occurs by subtracting the breakdown voltage of the Zener diode 225 from the voltage U * ..
  • the dimensioning of the capacitors 218 and 219 which is carried out from the point of view of energy, is taken into account. It is also expedient that
  • Capacitance of the second capacitor 219 to be selected approximately 2 to 5 times as large as the capacitance of the first capacitor 218.
  • the value of resistor 224 may also be zero.
  • the ladder concept is the same as that explained in connection with the embodiment according to FIG. 1.
  • the total ignition energy does not have to be high in the inventive ignition device
  • the staggered capacitor discharge makes economical use of space possible. Furthermore, the use of cheaper capacitors is made possible and an improvement in the takeover behavior is achieved. In the critical area of taking over the high-pressure gas discharge lamp from the ignition to the burning mode, enough energy can be replenished at a low voltage level.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The invention concerns a high-pressure gas-discharge lamp (10) connected at one end via the secondary winding (16) of a starter transformer (14) to a line (11) and at the other end to a second line (12). A first voltage (U1) is therefore applied to the lamp. A third line (13) enables another voltage (U2) to be applied. The ignition energy is supplied in the form of a pulse. This is done by connecting in series with the primary winding (15) a spark gap (17) which allows a current pulse to pass when its breakdown voltage is reached. Connected in parallel with this series circuit is a first capacitor (18) which is charged by voltage (U2) through a series-connected resistor (20). In parallel with the first capacitor is a second capacitor (19) connected in series with a diode (22). The point at which the second capacitor and the diode are connected is joined to the second line (12) via a resistor (21). This second capacitor (19) is charged by voltage (U1). The ignition-current path is completed by a voltage-discharge limiter (23). Thus the discharge, when it occurs, is staggered, coming initially from the first capacitor and then from both.

Description

Zündvorrichtung für eine Hochdruck-GasentladungslampeIgnition device for a high pressure gas discharge lamp
Stand der TechnikState of the art
Die Erfindung geht aus von einer Zündvorrichtung für eineThe invention relates to an ignition device for a
Hochdruck-Gasentladungslampe, insbesondere für den Einsatz in Scheinwerfern von Kraftfahrzeugen, der im Oberbegriff des Anspruchs 1 definierten Gattung.High-pressure gas discharge lamp, in particular for use in headlights of motor vehicles, of the type defined in the preamble of claim 1.
Bei einer bekannten Zündvorrichtung dieser Art wie sie in der DE 40 17 415 C2 beschrieben ist, ist ein Zündtransformator vorgesehen, dessen Primärwicklung eine Spannung zugeführt wird. Die Sekundärwicklung transformiert diese Spannung auf diejenige Spannung hoch, die zum Zünden der Lampe notwendig ist. Auf der Primärseite ist ein Kondensator parallel zu der Reihenschaltung der Primärwicklung und eines steuerbaren Schalters, der beispielsweise durch einen Thyristor gebildet wird, angeordnet. Dieser Kondensator wird zum Zünden auf eine zu diesem Zeitpunkt dann anliegende und wirksame Spannung aufgeladen. Bei Erreichen einer bestimmten Spannung wird der steuerbare Schalter durchgeschaltet und der Kondensator zur Abgabe des Zündimpulses entladen. Bei dieser bekannten Zündvorrichtung ist die gesamte Zündenergie und die in der kritischen Phase der Überleitung der Hochdruck- Gasentladungslampe vom Zünd- in den Brennbetrieb notwendige Energie von einem einzigen Kondensator aufzubringen. Dieser muß zum einem daher auf ein sehr hohes Spannungsniveau aufladbar sein und zum anderen die notwendige Kapazität aufweisen. Dies macht ein teures und aufwendiges Bauteil nötig, welches außerdem erheblichen Raumbedarf erfordert.In a known ignition device of this type, as described in DE 40 17 415 C2, an ignition transformer is provided, the primary winding of which a voltage is supplied. The secondary winding transforms this voltage up to the voltage required to ignite the lamp. A capacitor is arranged on the primary side in parallel with the series connection of the primary winding and a controllable switch, which is formed, for example, by a thyristor. This capacitor is charged for ignition to an effective voltage which is then present at this point in time. When a certain voltage is reached, the controllable switch is turned on and the capacitor is discharged to deliver the ignition pulse. In this known ignition device, the entire ignition energy and the energy required in the critical phase of the transfer of the high-pressure gas discharge lamp from the ignition to the combustion mode are to be provided by a single capacitor. On the one hand, this must be able to be charged to a very high voltage level and on the other hand must have the necessary capacity. This makes an expensive and complex component necessary, which also requires considerable space.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemaße Zündvorrichtung für eine Hochdruck- Gasentladungslampe mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil der Verbesserung des Übernahmeverhaltens, da im kritischen Bereich der Übernahme der Hochdruck-Gasentladungslampe vom Zündbetrieb in den Brennbetrieb Energie nachgeschoben werden kann. In vorteilhafter Weise erfolgt dies so, daß durch die erfindungsgemäß gestaffelte Kondensatorentladung nicht die gesamte Zündenergie auf hohem Spannungsniveau zur Verfügung gestellt werden muß. Dadurch ist eine ökonomische Raumausnutzung möglich bei Verwendung von preiswerteren und kleineren Bauelementen. Dies führt sowohl zu Platz- als auch zu Kostenersparnissen.The ignition device according to the invention for a high-pressure gas discharge lamp with the characterizing features of claim 1 has the advantage of improving the takeover behavior, since in the critical area of takeover of the high pressure gas discharge lamp energy can be replenished from the ignition mode to the burning mode. This advantageously takes place in such a way that the capacitor discharge according to the invention does not have to provide the entire ignition energy at a high voltage level. This enables economical use of space when using cheaper and smaller components. This leads to both space and cost savings.
Dies wird gemäß der Erfindung prinzipiell dadurch erreicht, daß parallel zum Kondensator ein zweiter Kondensator in Reihe mit einer Diode vorgesehen ist, daß dieser zweite Kondensator auf eine geringere Spannung aufladbar ist als der erste Kondensator, und daß dieser zweite Kondensator dann über die entsprechend gepolte Diode und den durchgeschalteten steuerbaren Schalter in die Primärwicklung entladen wird, wenn seine Spannung größer geworden ist, als die des ersten Kondensators bei dessen Entladung. In zweckmäßiger Ausgestaltung der Erfindung ist die Kapazität des zweiten Kondensators etwa 2- bis 5-fach so groß wie die Kapazität des ersten Kondensators.In principle, this is achieved according to the invention in that a second capacitor in series with a diode is provided in parallel with the capacitor, in that this second capacitor can be charged to a lower voltage than the first capacitor, and in that this second capacitor is then connected via the correspondingly polarized diode and the connected controllable switch is discharged into the primary winding when its voltage has become greater than that of the first capacitor when it is discharged. In an expedient embodiment of the invention, the capacitance of the second capacitor is approximately 2 to 5 times as large as the capacitance of the first capacitor.
In vorteilhafter Weiterbildung der Erfindung ist die den ersten Kondensator aufladende Spannung großer, vorzugsweise ca. 2- bis 5-fach so groß, als die den zweiten Kondensator aufladende Spannung.In an advantageous development of the invention, the voltage charging the first capacitor is large, preferably approximately 2 to 5 times as large as the voltage charging the second capacitor.
Die Erfindung laßt sich in zwei besonders vorteilhaftenThe invention can be divided into two particularly advantageous ones
Ausgestaltungen realisieren. Die eine besteht darin, daß der erste Kondensator von einer separat zugefuhrten Spannung aufladbar ist. Man kann dies auch als das 3-Leιterkonzept bezeichnen. Die andere, die als 2-Leιterkonzept zu bezeichnen ist, besteht darin, daß der zweite Kondensator von einer intern gewonnenen Spannung aufladbar ist, welche vorzugsweise um die Spannungsdifferenz einer Z-Diode geringer ist als diejenige Spannung, mit welcher der erste Kondensator aufladbar ist.Realize designs. One is that the first capacitor can be charged by a separately supplied voltage. This can also be referred to as the 3-letter concept. The other, which can be described as a 2-wire concept, consists in the fact that the second capacitor can be charged by an internally obtained voltage, which is preferably smaller by the voltage difference of a Zener diode than the voltage with which the first capacitor can be charged.
In weiterer vorteilhafter Ausgestaltung der Erfindung ist vorgesehen, daß in Reihe mit den beiden Kondensatoren Widerstände vorgesehen sind, mit deren Hilfe die Zeitkonstanten der Aufladung der Kondensatoren unter Beachtung der erforderlichen Energie, die zur Zündung der Hochdruck-Gasentladungslampe und zu deren Überleitung in den Brennbetrieb notwendig ist, so wahlbar sind, daß am zweiten Kondensator dann die gewünschte Spannung erreicht ist, wenn der steuerbare Schalter schließt.In a further advantageous embodiment of the invention it is provided that resistors are provided in series with the two capacitors, with the aid of which the time constants for charging the capacitors, taking into account the energy required to ignite the high-pressure gas discharge lamp and to transfer it to the burning mode is so selectable that the desired voltage is reached on the second capacitor when the controllable switch closes.
In zweckmäßiger Ausgestaltung der Erfindung ist der steuerbare Schalter eine Funkenstrecke, welche bei Erreichen einer bestimmten Spannung durchschaltet.In an expedient embodiment of the invention, the controllable switch is a spark gap, which switches through when a certain voltage is reached.
Zum Schutz der die Zundschaltung versorgenden Spannungsversorgung gegen Spannungsstoße sowie zum Schließen des Zundstrompfades, ist in weiterer vorteilhafter Ausgestaltung der Erfindung zwischen den Eingangsklemmen der Zündvorrichtung ein Spannungsbegrenzungselement, z. B. ein Varistor, vorgesehen. ZeichnungIn order to protect the voltage supply supplying the ignition circuit against voltage surges and to close the ignition current path, a voltage limiting element, for. B. a varistor provided. drawing
Die Erfindung ist anhand mehrerer in der Zeichnung dargestellter Ausführungsbeispiele in der nachfolgenden Beschreibung naher erläutert. Es zeigen:The invention is explained in more detail in the following description with reference to several exemplary embodiments shown in the drawing. Show it:
Fig. 1 ein erstes Ausfuhrungsbeispiel der erfindungsgemaß gestalteten Zündvorrichtung nach dem 3-Leιterkonzept, undFig. 1 shows a first exemplary embodiment of the ignition device designed according to the 3-Leιter concept, and
Fig. 2 ein zweites Ausführungsbeispiel der erfindungsgemaß gestalteten Zündvorrichtung nach dem 2-Leιterkonzept .Fig. 2 shows a second embodiment of the ignition device designed according to the invention according to the 2-Leιter concept.
Beschreibung der AusfuhrungsbeispieleDescription of the exemplary embodiments
In Fig. 1 ist ein erstes Ausführungsbeispiel der erfindungsgemaß gestalteten Zündvorrichtung dargestellt, das nach dem sogenannten 3-Leιterkonzept aufgebaut ist. Eine Hochdruck-Gasentladungslampe 10 ist auf einer Seite über eine Sekundärwicklung 16 einesIn Fig. 1 a first embodiment of the ignition device designed according to the invention is shown, which is constructed according to the so-called 3-wire concept. A high-pressure gas discharge lamp 10 is on one side via a secondary winding 16
Zundtransfomators 14 mit einer ersten Anschlußleitung 11 einer nicht naher dargestellten Stromversorgungsschaltung verbunden. Die Hochdruck-Gasentladungslampe 10 ist auf ihrer zweiten Seite mit einer zweiten Anschlußleitung 12 der Stromversorgungs- Schaltung verbunden. Zwischen den Anschlußleitungen 11 und 12 liegt eine erste Spannung üi an. Eine dritte Anschlußleitung 13 liefert eine weitere Spannung U2 zwischen den Anschlüssen 11 und 13. Über diese drei Anschlußleitungen wird die Hocndruck- Gasentladungslampe 10 sowohl mit Brenn- als auch mit Zundenergie versorgt.Ignition transformer 14 connected to a first connecting line 11 of a power supply circuit, not shown in detail. The second side of the high-pressure gas discharge lamp 10 is connected to a second connecting line 12 of the power supply circuit. A first voltage ui is present between the connecting lines 11 and 12. A third connecting line 13 supplies a further voltage U 2 between the connections 11 and 13. Via these three connecting lines, the high pressure gas discharge lamp 10 is supplied with both combustion and ignition energy.
Die Zundenergie wird von der erfindungsgemaß gestalteten Zündvorrichtung mit Hilfe eines Impulses aufgebracht. Dazu ist der Zundtransformator 14 mit einer Primärwicklung 15 und der Sekundärwicklung 16, die eng miteinander gekoppelt sind, versehen. In Reihe mit der Primärwicklung 15 ist eine Funkenstrecke 17 als ein preiswerter steuerbarer Schalter vorgesehen, die bei Erreichen der Durchbruchsspannung schlagartig leitend wird, den Zundimpuls somit generiert und den Stromfluß durch die Primärwicklung 15 ermöglicht. Parallel zu derThe ignition energy is applied by the ignition device designed according to the invention with the aid of a pulse. For this purpose, the ignition transformer 14 with a primary winding 15 and the secondary winding 16, which are closely coupled, Mistake. In series with the primary winding 15, a spark gap 17 is provided as an inexpensive controllable switch which suddenly becomes conductive when the breakdown voltage is reached, thus generating the firing pulse and allowing the current to flow through the primary winding 15. Parallel to that
Reihenschaltung von Primärwicklung 15 und Funkenstrecke 17 ist em erster Kondensator 18 angeordnet. Dieser erste Kondensator 18 liegt in Reihe mit einem Widerstand 20 zwischen den Anschlußleitungen 11 und 13 und wird somit von der Spannung U aufgeladen. Parallel zu dem ersten Kondensator 18 ist dieSeries connection of primary winding 15 and spark gap 17 is arranged em first capacitor 18. This first capacitor 18 is connected in series with a resistor 20 between the connecting lines 11 and 13 and is thus charged by the voltage U. In parallel with the first capacitor 18
Reihenschaltung eines zweiten Kondensators 19 und einer Diode 22 vorgesehen. Der Verbindungspunkt von Kondensator 19 und Diode 22 ist über einen Widerstand 21 mit der Anschlußleitung 12 verbunden. Dieser zweite Kondensator 19 liegt also in Reihe mit dem Widerstand 21 zwischen den Anschlußleitungen 11 und 12 und wird somit von der Spannung Ul aufgeladen. Die Diode 22 ist so gepolt, daß ihre Anode an den Verbindungspunkt des zweiten Kondensators 19 und des Widerstands 21 angeschlossen ist, und daß ihre Kathode mit dem Verbindungspunkt des ersten Kondensators 18 und dem Widerstand 20, sowie dem einen Anschluß der Funkenstrecke 17, verbunden ist. Zum Schutz der nicht dargestellten Stromversorgungsschaltung vor Spannungsstoßen vom Zundtransformator 14 und zum Schließen des Zundstrompfades der Hochdruck-Gasentladungslampe 10 ist zwischen den Anschlußleitungen 11 und 12 em Varistor 23 angeordnet.Series connection of a second capacitor 19 and a diode 22 is provided. The connection point of the capacitor 19 and the diode 22 is connected to the connecting line 12 via a resistor 21. This second capacitor 19 is therefore in series with the resistor 21 between the connecting lines 11 and 12 and is thus charged by the voltage U1. The diode 22 is poled so that its anode is connected to the connection point of the second capacitor 19 and the resistor 21, and that its cathode is connected to the connection point of the first capacitor 18 and the resistor 20, as well as the one connection of the spark gap 17 . To protect the power supply circuit, not shown, against voltage surges from the ignition transformer 14 and to close the ignition current path of the high-pressure gas discharge lamp 10, a varistor 23 is arranged between the connecting lines 11 and 12.
Die Wirkungsweise der vorstehend beschriebenen Ausfuhrungsform der erfindungsgemaß gestalteten Zündvorrichtung ist folgende. Über die an der Anschlußleitung 13 anstehende Spannung Ut, die nur wahrend der Zündung gebraucht wird und daher alsThe mode of operation of the above-described embodiment of the ignition device designed according to the invention is as follows. About the applied voltage U t on the connecting line 13, which is only used during the ignition and therefore as
Hilfsspannung bezeichnet werden kann, wird der erste Kondensator 18 über den Widerstand 20 bis zum Durchschlag der Funkenstrecke 17 aufgeladen. Gleichzeitig ladt die zwischen den Anschlußleitungen 11 und 12 anstehende Spannung U*., welche die Ubernahmespannung und spater die Brennspannung der Hochdruck- Gasentladungslampe 10 liefert, über den Widerstand 21 den zweiten Kondensator 19 auf. In dieser Phase ist die Spannung U immer größer als die Spannung U;. Ein vorteilhaftes Verhältnis für die Spannungen sieht vor, daß U2 ca. 2- bis 5-fach so groß ist wie die Spannung U-.. Dadurch ist die Diode 22 gesperrt. Die Zeitkonstanten für die Aufladung der Kondensatoren, Tl = R20 * C18 für den ersten Kondensator 18, und T2 = R21 * C19 für den zweiten Kondensator 19, werden durch geeignete Auswahl der Widerstände 20 und 21 so gewählt, daß die gewünschte Spannung UC2 am zweiten Kondensator 19 erreicht ist, wenn die Funkenstrecke 17 durchschaltet. Bei der Wahl der Zeitkonstanten wird die vorher erfolgte Dimensionierung der Kondensatoren, die aus derAuxiliary voltage can be referred to, the first capacitor 18 is charged via the resistor 20 until the spark gap 17 breaks down. At the same time, the voltage U * present between the connecting lines 11 and 12 charges . , which supplies the takeover voltage and later the operating voltage of the high-pressure gas discharge lamp 10, via the resistor 21 to the second capacitor 19. The voltage U is always in this phase greater than the voltage U ; , An advantageous ratio for the voltages provides that U 2 is approximately 2 to 5 times as large as the voltage U- . , As a result, the diode 22 is blocked. The time constants for charging the capacitors, Tl = R 20 * C 18 for the first capacitor 18, and T2 = R 21 * C 19 for the second capacitor 19, are selected by suitable selection of the resistors 20 and 21 so that the desired one Voltage U C2 on the second capacitor 19 is reached when the spark gap 17 switches on. When selecting the time constants, the dimensioning of the capacitors, which has taken place previously, is taken into account
Energiebetrachtung vorgenommen wird, beachtet. Weiterhin ist es zweckmäßig, die Kapazität des zweiten Kondensators 19 etwa 2- bis 5-fach so groß wie die Kapazität des ersten Kondensators 18 zu wählen.Energy consideration is made, observed. Furthermore, it is expedient to select the capacitance of the second capacitor 19 approximately 2 to 5 times as large as the capacitance of the first capacitor 18.
Beim Durchschlag der Funkenstrecke 17 erfolgt ein Stromfluß im Primärkreis, bestehend aus dem ersten Kondensator 18, der Primärwicklung 15 und der Funkenstrecke 17. Dieser Stromfluß erzeugt gemäß dem Übersetzungsverhältnis des Zündtransformators 14 eine Spannung in der Sekundärwicklung 16, die zum Durchschlag in der Hochdruck-Gasentladungslampe 10 führt. Nach diesem Durchschlag muß dafür gesorgt werden, daß der Lichtbogen in der Hochdruck-Gasentladungslampe 10 stabilisiert wird. Dazu muß Energie nachgeliefert werden. Dies erfolgt erfindungsgemäß besonders dadurch, daß dann, wenn die Spannung Uci am erstenWhen the spark gap 17 breaks down, a current flows in the primary circuit, consisting of the first capacitor 18, the primary winding 15 and the spark gap 17. This current flow generates a voltage in the secondary winding 16 in accordance with the transmission ratio of the ignition transformer 14, which leads to breakdown in the high-pressure gas discharge lamp 10 leads. After this breakdown, it must be ensured that the arc in the high-pressure gas discharge lamp 10 is stabilized. To do this, energy must be supplied. This takes place according to the invention particularly in that when the voltage U ci at the first
Kondensator den Wert Uc2 am zweiten Kondensator 19 unterschreitet, auch die im zweiten Kondensator 19 gespeicherte Energie, zusätzlich zu der im ersten Kondensator 18 gespeicherten Energie, zur Verfügung steht und über Primärwicklung 15, hochtransformiert mittels der Sekundärwicklung 16, gleichzeitig und dann gemeinsam an die Hochdruck-Gasentladungslampe 10 abgegeben wird. Die nach dem Durchschlag der Hochdruck-Gasentladungslampe 10 beim Übergang von der Zündung des Lichtbogens in den Brennbetrieb notwendige Energie wird also erfindungsgemäß durch die gestaffelte Kondensatorentladung auf wesentlich niedrigerem Spannungsniveau nachgeschoben. In Fig. 2 ist ein zweites Ausführungsbeispiel der erfindungsgemaß gestalteten Zündvorrichtung dargestellt, das nach dem sogenannten 2-Leιterkonzept aufgebaut ist. Eine Hochdruck-Gasentladungslampe 210 ist auf einer Seite über eme Sekundärwicklung 216 eines Zundtransfomators 214 mit einer ersten Anschlußleitung 211 einer nicht naher dargestellten Stromversorgungsschaltung verbunden. Die Hochdruck-Gasentladungslampe 210 ist auf ihrer zweiten Seite mit einer zweiten Anschlußleitung 212 der Stromversorgungs- schaltung verbunden. Zwischen den Anschlußleitungen 211 und 212 liegt eine Spannung U-. an. über diese beiden Anschlußleitungen wird die Hochdruck-Gasentladungslampe 210 sowohl mit Brenn- als auch mit Zundenergie versorgt.Capacitor falls below the value U c2 on the second capacitor 19, also the energy stored in the second capacitor 19, in addition to the energy stored in the first capacitor 18, is available and via the primary winding 15, highly transformed by means of the secondary winding 16, simultaneously and then jointly to the High pressure gas discharge lamp 10 is emitted. The energy required after the high-pressure gas discharge lamp 10 has broken down during the transition from the ignition of the arc to the burning mode is thus replenished according to the invention by the staggered capacitor discharge to a substantially lower voltage level. 2 shows a second exemplary embodiment of the ignition device designed according to the invention, which is constructed according to the so-called 2-wire concept. A high-pressure gas discharge lamp 210 is connected on one side via a secondary winding 216 of an ignition transformer 214 to a first connecting line 211 of a power supply circuit, not shown in detail. The second side of the high-pressure gas discharge lamp 210 is connected to a second connecting line 212 of the power supply circuit. There is a voltage U- between the connecting lines 211 and 212 . on. The high-pressure gas discharge lamp 210 is supplied with both combustion and ignition energy via these two connecting lines.
Die Zundenergie wird von der erfindungsgemaß gestalteten Zündvorrichtung mit Hilfe eines Impulses aufgebracht. Dazu ist der Zundtransformator 214 mit einer Primärwicklung 215 und der Sekundärwicklung 216, die eng miteinander gekoppelt sind, versehen. In Reihe mit der Primärwicklung 215 ist eine Funkenstrecke 217 als ein steuerbarer Schalter vorgesehen, der bei Erreichen der Durchbruchsspannung schlagartig leitend wird, den Zundimpuls somit generiert und den Stromfluß durch die Primärwicklung 215 ermöglicht. Parallel zu der Reihenschaltung von Primärwicklung 215 und Funkenstrecke 217 ist ein erster Kondensator 218 angeordnet. Dieser erste Kondensator 218 liegt in Reihe mit einem Widerstand 220 zwischen denThe ignition energy is applied by the ignition device designed according to the invention with the aid of a pulse. For this purpose, the ignition transformer 214 is provided with a primary winding 215 and the secondary winding 216, which are closely coupled to one another. In series with the primary winding 215, a spark gap 217 is provided as a controllable switch which suddenly becomes conductive when the breakdown voltage is reached, thus generating the firing pulse and permitting the current to flow through the primary winding 215. A first capacitor 218 is arranged in parallel with the series connection of primary winding 215 and spark gap 217. This first capacitor 218 is in series with a resistor 220 between the
Anschlußleitungen 211 und 212 und wird somit von der Spannung Oλ aufgeladen. Parallel zu dem ersten Kondensator 218 ist die Reihenschaltung eines zweiten Kondensators 219 und einer Diode 222 vorgesehen. Der Verbindungspunkt von Kondensator 219 und Diode 222 ist über die Reihenschaltung eines Widerstands 224 und einer Z-Diode 225 sowie des Widerstandes 220 mit der Anschlußleitung 212 verbunden. Am Verbindungspunkt dieses zweiten Kondensators 219 mit der Diode 222 liegt also eine intern erzeugte Spannung U2 an, die um die Spannung der Z-Diode 225 niedriger ist als die Spannung Uj. Die Diode 222 ist so gepolt, daß ihre Anode an den Verbindungspunkt des zweiten Kondensators 219 und des Widerstands 224 angeschlossen ist, und daß ihre Kathode mit dem Verbindungspunkt des ersten Kondensators 218 und dem Widerstand 220, sowie dem einen Anschluß der Funkenstrecke 217, verbunden ist. Zum Schutz der nicht dargestellten Stromversorgungsschaltung vor Spannungsstoßen vom Zundtransformator 214 und zum Schließen des Zundsti ompfades der Hochdruck-Gasentladungslampe 210 ist zwischen den Anschlußleitungen 211 und 212 em Spannungsbegrenzungselement 223, z. B. em Varistor, angeordnet.Connection lines 211 and 212 and is thus charged by the voltage O λ . The series connection of a second capacitor 219 and a diode 222 is provided in parallel with the first capacitor 218. The connection point of capacitor 219 and diode 222 is connected to the connecting line 212 via the series connection of a resistor 224 and a Zener diode 225 and the resistor 220. At the point of connection of this second capacitor 219 to the diode 222, there is an internally generated voltage U 2 which is lower than the voltage Uj by the voltage of the Zener diode 225. Diode 222 is poled so that its anode is connected to the junction of second capacitor 219 and resistor 224, and its Cathode is connected to the connection point of the first capacitor 218 and the resistor 220, and the one connection of the spark gap 217. To protect the power supply circuit, not shown, from voltage surges from the ignition transformer 214 and to close the ignition path of the high-pressure gas discharge lamp 210, a voltage limiting element 223, for. B. em varistor arranged.
Die Wirkungsweise der vorstehend beschriebenen zweitenThe operation of the second described above
Ausfuhrungsform der erfindungsgemaß gestalteten Zündvorrichtung ist folgende, wobei nur die von der ersten Ausfuhrungsform abweichende hier beschrieben wird. Die Ladung des zweiten Kondensators 219 auf das Spannungsniveau Uc-> erfolgt mit Hilfe eines Teiles der Spannung U-., die intern erzeugte Spannung U_. Diese entsteht durch Subtraktion der Durchbruchsspannung der Zenerdiode 225 von der Spannung U*.. Die Zeitkonstante für den ersten Kondensator 218, Tl = R22o * C21β, und die Zeitkonstante für den zweiten Kondensator 219, T2 = C-19 * (R220 + R224) 1 werden durch geeignete Auswahl der Widerstände 220, und 224 so gewählt, daß die gewünschte Spannung Uc2 am zweiten Kondensator 219 erreicht ist, wenn die Funkenstrecke 217 durchschaltet . Bei der Wahl der Zeitkonstanten wird die vorher erfolgte Dimensionierung der Kondensatoren 218 und 219, die aus der Energiebetrachtung vorgenommen wird, beachtet. Weiterhin ist es zweckmäßig, dieThe embodiment of the ignition device designed according to the invention is as follows, only the one deviating from the first embodiment being described here. The charge of the second capacitor 219 to the voltage level U c -> takes place with the help of a part of the voltage U-., The internally generated voltage U_. This occurs by subtracting the breakdown voltage of the Zener diode 225 from the voltage U * .. The time constant for the first capacitor 218, Tl = R 22 o * C 21β , and the time constant for the second capacitor 219, T2 = C-19 * (R220 + R2 24 ) 1 are selected by suitable selection of the resistors 220, and 224 so that the desired voltage U c2 is reached at the second capacitor 219 when the spark gap 217 switches through. When selecting the time constant, the dimensioning of the capacitors 218 and 219, which is carried out from the point of view of energy, is taken into account. It is also expedient that
Kapazität des zweiten Kondensators 219 etwa 2- bis 5-fach so groß wie die Kapazität des ersten Kondensators 218 zu wählen. Der Wert des Widerstands 224 kann unter Umstanden auch Null sein.Capacitance of the second capacitor 219 to be selected approximately 2 to 5 times as large as the capacitance of the first capacitor 218. The value of resistor 224 may also be zero.
Die weitere Wirkungsweise dieser Ausfuhrungsform nach dem 2-The further mode of operation of this embodiment after the 2-
Leiterkonzept ist gleich derjenigen, die im Zusammenhang mit der Ausfuhrungsform gemäß Fig. 1 erläutert wurde.The ladder concept is the same as that explained in connection with the embodiment according to FIG. 1.
In vorteilhafter Weise muß bei der erfindungsgemaßen Zündvorrichtung nicht die gesamte Zundenergie auf hohemAdvantageously, the total ignition energy does not have to be high in the inventive ignition device
Spannungsniveau zur Verfugung gestellt werden. Die gestaffelte Kondensatorentladung macht eine ökonomische Raumau∑nutzung möglich. Weiterhin ist die Verwendung kostengünstigerer Kondensatoren ermöglicht sowie eine Verbesserung des Ubernahmeverhaltens erzielt. Im kritischen Bereich der Übernahme der Hochdruck-Gasentladungslampe vom Zund- in den Brennbetrieb kann genügend Energie auf niedrigem Spannungsniveau nachgeschoben werden. Voltage level will be provided. The staggered capacitor discharge makes economical use of space possible. Furthermore, the use of cheaper capacitors is made possible and an improvement in the takeover behavior is achieved. In the critical area of taking over the high-pressure gas discharge lamp from the ignition to the burning mode, enough energy can be replenished at a low voltage level.

Claims

Ansprüche Expectations
1. Zündvorrichtung für eine Hochdruck-Gasentladungslampe (10, 210) , insbesondere für den Einsatz in Scheinwerfern von Kraftfahrzeugen, mit einem Zündtransformator (14, 214), dessen Primärwicklung (15, 215) eine Spannung zuführbar ist, dessen Sekundärwicklung (16, 216) mit dem hochtransformierten Wert der Spannung die Hochdruck- Gasentladungslampe (10, 210) zündet, wobei auf der Primärseite ein Kondensator (18, 218) parallel zur1. Ignition device for a high-pressure gas discharge lamp (10, 210), in particular for use in headlights of motor vehicles, with an ignition transformer (14, 214), the primary winding (15, 215) of which a voltage can be supplied, the secondary winding (16, 216 ) ignites the high-pressure gas discharge lamp (10, 210) with the highly transformed value of the voltage, a capacitor (18, 218) parallel to the primary side
Reihenschaltung der Primärwicklung (15, 215) und eines steuerbaren Schalters (17, 217) vorgesehen ist, bei Einschaltung der Versorgungsspannung (Ui) der Kondensator (18, 218) geladen wird, und der Kondensator (18, 218) bei Erreichen einer bestimmten Spannung durch das Durchschalten des steuerbaren Schalters (17, 217) zur Abgabe der Spannung entladen wird, dadurch gekennzeichnet, daß parallel zum Kondensator (18, 218) ein zweiter Kondensator (19, 219) in Reihe mit einer Diode (22, 222) vorgesehen ist, daß dieser zweite Kondensator (19, 219) auf eine geringere Spannung aufladbar ist als der erste Kondensator (18, 218), und daß dieser zweite Kondensator (19, 219) dann über die entsprechend gepolte Diode (22, 222) und den durchgeschalteten steuerbaren Schalter (17, 217) in die Primärwicklung (15, 215) entladen wird, wenn seine Spannung (Uc2) größer geworden ist, als die (UCι) des ersten Kondensators (18, 218) bei dessen Entladung. Series connection of the primary winding (15, 215) and a controllable switch (17, 217) is provided, the capacitor (18, 218) is charged when the supply voltage (Ui) is switched on, and the capacitor (18, 218) when a certain voltage is reached is discharged by switching the controllable switch (17, 217) to deliver the voltage, characterized in that a second capacitor (19, 219) is provided in series with a diode (22, 222) in parallel with the capacitor (18, 218) that this second capacitor (19, 219) can be charged to a lower voltage than the first capacitor (18, 218), and that this second capacitor (19, 219) then via the correspondingly polarized diode (22, 222) and the switched through controllable switch (17, 217) is discharged into the primary winding (15, 215) when its voltage (U c2 ) has become greater than that (U C ι) of the first capacitor (18, 218) when it is discharged.
2. Zündvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Kapazität des zweiten Kondensators (19, 219) etwa 2- bis 5-fach so groß ist wie die Kapazität des ersten Kondensators (18, 218).2. Ignition device according to claim 1, characterized in that the capacitance of the second capacitor (19, 219) is approximately 2 to 5 times as large as the capacitance of the first capacitor (18, 218).
3. Zündvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die den ersten Kondensator (18, 218) aufladende Spannung (U. in Fig. 1, U-. in Fig. 2), großer ist, vorzugsweise ca. 2- bis 5-fach so groß, als die den zweiten Kondensator (19, 219) aufladende Spannung (Ui in 3. Ignition device according to claim 1 or 2, characterized in that the first capacitor (18, 218) charging voltage (U. in Fig. 1, U- . In Fig. 2), is greater, preferably about 2- to 5 times as large as the voltage charging the second capacitor (19, 219) (Ui in
4. Zündvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der erste Kondensator (18) von einer separat (13) zugefuhrten Spannung (U_) aufladbar ist.4. Ignition device according to one of claims 1 to 3, characterized in that the first capacitor (18) from a separately (13) supplied voltage (U_) can be charged.
5. Zündvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der zweite Kondensator (219) von einer intern gewonnenen Spannung (U2 in Fig. 2) aufladbar ist, welche vorzugsweise um die Spannungsdifferenz einer Z-Diode (225) geringer ist als diejenige Spannung (Ui) , mit welcher der erste Kondensator (218) aufladbar ist.5. Ignition device according to one of claims 1 to 3, characterized in that the second capacitor (219) from an internally obtained voltage (U 2 in Fig. 2) can be charged, which is preferably lower by the voltage difference of a Zener diode (225) is the voltage (Ui) with which the first capacitor (218) can be charged.
6. Zündvorrichtung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß in Reihe mit den beiden Kondensatoren6. Ignition device according to one of the preceding claims, characterized in that in series with the two capacitors
(18, 19; 218, 219) Widerstände (20, 21; 220, 224 und 220) vorgesehen sind, mit deren Hilfe die Zeitkonstanten der Aufladung der Kondensatoren (18, 19; 218, 219) unter Beachtung der erforderlichen Energie, die zur Zündung der Hochdruck- Gasentladungslampe (10, 210) und zu deren(18, 19; 218, 219) resistors (20, 21; 220, 224 and 220) are provided, with the aid of which the time constants for charging the capacitors (18, 19; 218, 219) are taken into account, taking into account the energy required for Ignition of the high pressure gas discharge lamp (10, 210) and their
Überleitung in den Brennbetrieb notwendig ist, so wahlbar sind, daß am zweiten Kondensator (19, 219) dann die gewünschte Spannung erreicht ist, wenn der steuerbare Schalter (17, 217) schließt. Transfer to the burner mode is necessary, so selectable that the desired voltage is reached on the second capacitor (19, 219) when the controllable switch (17, 217) closes.
7. Zündvorrichtung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß der steuerbare Schalter (17, 217) eine Funkenstrecke ist, welche bei Erreichen einer bestimmten Spannung durchschaltet.7. Ignition device according to one of the preceding claims, characterized in that the controllable switch (17, 217) is a spark gap, which switches through when a certain voltage is reached.
8. Zündvorrichtung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß zwischen den Eingangsklemmen (11, 12; 211, 212) der Zündvorrichtung ein Spannungsbegrenzungselement (23; 223), insbesondere ein Varistor, zum Schließen des Zündstrompfades vorgesehen ist. 8. Ignition device according to one of the preceding claims, characterized in that between the input terminals (11, 12; 211, 212) of the ignition device, a voltage limiting element (23; 223), in particular a varistor, is provided for closing the ignition current path.
EP96945836A 1995-12-01 1996-10-28 Starter for a high-pressure gas-discharge lamp Expired - Lifetime EP0811306B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19544838 1995-12-01
DE19544838A DE19544838A1 (en) 1995-12-01 1995-12-01 Ignition device for a high pressure gas discharge lamp
PCT/DE1996/002047 WO1997021329A1 (en) 1995-12-01 1996-10-28 Starter for a high-pressure gas-discharge lamp

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DE19544838A1 (en) 1997-06-05
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EP0811306B1 (en) 2001-10-17
JPH10513605A (en) 1998-12-22
KR19980701830A (en) 1998-06-25

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