EP0996315B1 - Method and apparatus for generating a status signal representing the operating state of a high-pressure gas discharge lamp in a motor vehicle - Google Patents
Method and apparatus for generating a status signal representing the operating state of a high-pressure gas discharge lamp in a motor vehicle Download PDFInfo
- Publication number
- EP0996315B1 EP0996315B1 EP99120661A EP99120661A EP0996315B1 EP 0996315 B1 EP0996315 B1 EP 0996315B1 EP 99120661 A EP99120661 A EP 99120661A EP 99120661 A EP99120661 A EP 99120661A EP 0996315 B1 EP0996315 B1 EP 0996315B1
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- EP
- European Patent Office
- Prior art keywords
- lamp
- voltage
- status
- status signal
- gas discharge
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- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2928—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
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2921—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2925—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
Definitions
- the invention relates to a method and a device for generating a status signal about the operating state of a high-pressure gas discharge lamp in a motor vehicle.
- a method and a device which detects the operating states "lamp on” and “lamp off” are known from EP 0 459 126 B1.
- the parameter "lamp current” is evaluated for status detection, the status signal being set when a predetermined lamp current is exceeded and being reset when a minimum lamp current is undershot. It is also known from EP 0 459126 B1 to detect the lamp voltage. The lamp power is determined from the values of the lamp voltage and the lamp current during the ignition process and is then controlled as a function of time.
- the ballast system When the ignition is active, the ballast system generates a high-voltage ignition pulse that is superimposed on a defined open circuit voltage. Passive ignition can e.g. B. caused by strong acceleration of the lamp (road bumps). The lamp current is cut off, which leads to an immediate increase in the lamp voltage. Even before the maximum open circuit voltage has been reached, the gas path is still strongly ionized, causing the gas to ignite automatically without generating a high voltage pulse. Since on the one hand the active ignitions must be sensed for the reasons already mentioned, on the other hand the passive ignitions that occur in practice must not lead to faulty shutdown, a differentiation between these ignition processes is very important.
- the invention is able to distinguish between passive and active ignition processes and to set the status signal only when the ignition processes are successful and to reset it when the ignition processes are unsuccessful, which is not possible with the prior art circuit.
- the high-pressure gas discharge lamp can also be ignited again by means of a passive ignition process; Switching off the high-pressure gas discharge lamp and actively re-igniting by means of a high-voltage pulse is therefore unnecessary.
- the safety circuit does not initiate any further active ignition after a predetermined number of changes in the status signal, since this indicates a persistent fault in the high-pressure gas discharge lamp or the control circuit.
- a DC voltage source (B) - generally this is the vehicle battery - energizes a voltage converter (W), which provides the AC voltage required to operate the high-pressure gas discharge lamp (GDL).
- An ignition device (Z) connected downstream of the voltage converter (W) also generates the high-voltage pulses required to start the gas discharge.
- the safety circuit controls the voltage converter (W) depending on the status signal (status). By actuating the voltage converter (W), the safety circuit can in particular initiate an active ignition process of the high-pressure gas discharge lamp (GDL). Furthermore, the safety circuit generates when Errors and immediately after switching on the power supply an error signal (error) which is present at an input (R 1 ) of a reversible digital storage element (FF) and which influences the status signal generated by the digital storage element (FF).
- error error
- a detection device (E) detects the parameters lamp current (I) and lamp voltage (U) between the voltage converter (W) and the ignition device (Z) and applies a current signal (I1) and voltage signal (U1) proportional to these parameters to a comparator ( X1) and a window comparator (X2).
- the window comparator (X2) generates a logic H signal when a first current threshold (IS1) is exceeded; it delivers an L signal when a second current threshold (IS2) is undershot.
- the comparator (X1) tilts from L to H if a voltage threshold (US1) is exceeded.
- the current thresholds (IS1 and IS2) are selected so that an interference-free determination of the lamp current is guaranteed.
- the value of the voltage threshold (US1) is clearly above the minimum lamp nominal voltage and below the open circuit voltage, which is necessary to generate an ignition pulse.
- the output signals of the comparators (X1, X2) are connected to the reset input (R) and the set input (S) of the reversible digital memory element (FF).
- the digital memory element (FF) is designed here as an RS flip-flop with two reset inputs (R, R 1 ) and a set input (S), the set input (S) compared to the reset inputs (R, R 1 ) takes precedence.
- the output signal of the reversible digital storage element (FF) is the status signal (status) about the operating state of the high pressure gas discharge lamp (GDL).
- the transition of the status signal (status) from L to H represents an active ignition process.
- this digital status signal (status) can be used for various applications and in particular for controlling the voltage converter.
- the voltage converter (W) generates the maximum open circuit voltage; this results in a first ignition pulse on the high pressure gas discharge lamp (GDL) after a few milliseconds. If the high-pressure gas discharge lamp (GDL) becomes sufficiently low-resistance, the current flows from the voltage converter (W). This lamp current (I) sets the window comparator (X2) via the detection device (E) to the status signal (status) via the set input (S) of the digital storage element (FF).
- the high-pressure gas discharge lamp (GDL) goes out after the takeover the signal at the set input (S) is withdrawn again, but the status signal (status) remains set. Only when the immediately increasing converter voltage (U) becomes so great that the voltage signal (U1) proportional to the lamp voltage (U) exceeds the voltage threshold (US1) is the digital memory element (FF) reset via the input (R).
- the ballast system consisting of voltage converter (W) and ignition device (Z), generates an active ignition again; If the current flows, the status signal (status) becomes H. This process repeats itself until the ignition process has been successfully completed or until a defined number of status changes has been reached and the safety circuit (Si) aborts the process.
- the signal at the set input (S) of the digital storage element (FF) also changes to L. Does the increasing lamp voltage (U) cause automatic re-ignition before on Input of the comparator (X1) the voltage threshold (US1) is reached, there is no reset of the status signal (status); the passive ignition is therefore not counted.
- ballast system If the voltage (U1) at the comparator input exceeds the threshold (US1), there is no passive ignition and the status signal (status) is reset.
- the ballast system now generates a high-voltage pulse with the same sequence as when the high-pressure gas discharge lamp (GDL) was started for the first time. This process is also recognized and counted as active ignition.
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- Circuit Arrangements For Discharge Lamps (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Erzeugung eines Statussignales über den Betriebszustand einer Hochdruckgasentladungslampe in einem Kraftfahrzeug.The invention relates to a method and a device for generating a status signal about the operating state of a high-pressure gas discharge lamp in a motor vehicle.
Zum einwandfreien Betrieb einer Hochdruckgasentladungslampe durch ein Vorschaltgerät ist es notwendig, jederzeit den genauen Betriebszustand der Lampe zu kennen. Dazu zählt insbesondere der Zündvorgang; dieser muß aus sicherheitsrelevanten Gründen (Erzeugung von Hochspannung) zum Schutz elektronischer Bauelemente und zur Ablaufsteuerung überwacht werden. Um diese Anforderungen zu erfüllen, ist eine Schaltung erforderlich, die in der Lage ist, den Zündvorgang mit hoher Störsicherheit zu detektieren.For a high-pressure gas discharge lamp to operate properly with a ballast, it is necessary to know the exact operating state of the lamp at all times. This particularly includes the ignition process; this must be monitored for safety-related reasons (generation of high voltage) for the protection of electronic components and for sequence control. In order to meet these requirements, a circuit is required which is able to detect the ignition process with a high level of interference immunity.
Ein Verfahren und eine Vorrichtung, welche die Betriebszustände "Lampe ein" und "Lampe aus" erkennt, ist aus der EP 0 459 126 B1 bekannt. Hierin wird zur Statuserkennung nur der Parameter "Lampenstrom" ausgewertet, wobei das Statussignal gesetzt wird, wenn ein vorgegebener Lampenstrom überschritten wird, und wieder zurückgesetzt wird, wenn ein minimaler Lampenstrom unterschritten wird. Aus der EP 0 459126 B1 ist zudem bekannt, die Lampenspannung zu erfassen. Aus den Werten der Lampenspannung und des Lampenstromes wird während des Zündvorganges die Lampenleistung bestimmt, welche dann zeitabhängig gesteuert wird.A method and a device which detects the operating states "lamp on" and "lamp off" are known from EP 0 459 126 B1. In this case, only the parameter "lamp current" is evaluated for status detection, the status signal being set when a predetermined lamp current is exceeded and being reset when a minimum lamp current is undershot. It is also known from EP 0 459126 B1 to detect the lamp voltage. The lamp power is determined from the values of the lamp voltage and the lamp current during the ignition process and is then controlled as a function of time.
Bei dieser bekannten Schaltung wird jedoch der Wert der Lampenspannung nicht zur Statuserkennung der Lampe herangezogen. Daraus ergibt sich der Nachteil, daß sogenannte "passive Zündvorgänge" durch diese Schaltung nicht erkannt werden.In this known circuit, however, the value of the lamp voltage is not used to identify the status of the lamp. This results in the disadvantage that so-called "passive ignition processes" are not recognized by this circuit.
Dies bedeutet: Bei einer aktiven Zündung wird vom Vorschaltsystem ein Hochspannungszündimpuls erzeugt, der einer definierten Leerlaufspannung überlagert ist. Eine passive Zündung kann z. B. durch starke Beschleunigung der Lampe (Fahrbahnunebenheiten) hervorgerufen werden. Hierbei kommt es zum Abriß des Lampenstromes, was ein sofortiges Ansteigen der Lampenspannung zur Folge hat. Noch vor dem Erreichen der maximalen Leerlaufspannung erfolgt aufgrund der noch stark ionisierten Gasstrecke ein selbständiges Nachzünden ohne Erzeugung eines Hochspannungsimpulses. Da einerseits die aktiven Zündungen aus bereits genannten Gründen sensiert werden müssen, andererseits die in der Praxis auftretenden passiven Zündungen nicht zum fehlerhaften Abschalten führen dürfen, ist eine Differenzierung zwischen diesen Zündvorgängen sehr wichtig.This means: When the ignition is active, the ballast system generates a high-voltage ignition pulse that is superimposed on a defined open circuit voltage. Passive ignition can e.g. B. caused by strong acceleration of the lamp (road bumps). The lamp current is cut off, which leads to an immediate increase in the lamp voltage. Even before the maximum open circuit voltage has been reached, the gas path is still strongly ionized, causing the gas to ignite automatically without generating a high voltage pulse. Since on the one hand the active ignitions must be sensed for the reasons already mentioned, on the other hand the passive ignitions that occur in practice must not lead to faulty shutdown, a differentiation between these ignition processes is very important.
Es ist daher die Aufgabe der Erfindung, ein Verfahren und eine möglichst einfache und kostengünstige Vorrichtung zu schaffen, die zur Steuerung der Hochdruckgasentladungslampe ein Statussignal über den Lampenbetriebszustand bildet, welche auch passive Zündvorgänge ermöglicht und nicht erfolgreiche passive Zündvorgänge erkennt.It is therefore the object of the invention to provide a method and a device which is as simple and inexpensive as possible and which, in order to control the high-pressure gas discharge lamp, forms a status signal relating to the lamp operating state, which also enables passive ignition processes and does not recognize successful passive ignition processes.
Diese Aufgabe wird durch die kennzeichnenden Merkmale der Ansprüche 1 und 2 gelöst.This object is achieved by the characterizing features of claims 1 and 2.
Neu gegenüber dem Stand der Technik ist die zusätzliche Verknüpfung mit dem Parameter Lampenspannung. Die Erfindung ist in der Lage, passive und aktive Zündvorgänge zu unterscheiden und nur bei erfolgreichen aktiven Zündvorgängen das Statussignal zu setzen und es bei nicht erfolgreichen passiven Zündvorgängen zurückzusetzen, was bei der Schaltung nach dem Stand der Technik nicht möglich ist.What is new compared to the state of the art is the additional link with the lamp voltage parameter. The invention is able to distinguish between passive and active ignition processes and to set the status signal only when the ignition processes are successful and to reset it when the ignition processes are unsuccessful, which is not possible with the prior art circuit.
Vorteilhafterweise kann so auch die Hochdruckgasentladungslampe mittels eines passiven Zündvorganges wieder gezündet werden; ein Abschalten der Hochdruckgasentladungslampe und aktives Neuzünden mittels eines Hochspannungsimpulses ist somit unnötig.Advantageously, the high-pressure gas discharge lamp can also be ignited again by means of a passive ignition process; Switching off the high-pressure gas discharge lamp and actively re-igniting by means of a high-voltage pulse is therefore unnecessary.
Besonders vorteilhaft ist, daß zur Erzeugung des Statussignales ausschließlich Signale verwendet werden, die zur Steuerung des Wandlers bereits vorhanden sind, was den erforderlichen Aufwand gering hält. Diese Signale werden durch drei einfache Bauteile (zwei Komparatoren und ein Flipflop) miteinander verknüpft. Die so ausgebildete erfindungsgemäße einfache Schaltungsanordnung führt das erfindungsgemäße Verfahren vollautomatisch aus.It is particularly advantageous that only signals that are already available to control the converter are used to generate the status signal, which keeps the effort required low. These signals are linked by three simple components (two comparators and a flip-flop). The simple circuit arrangement according to the invention designed in this way carries out the method according to the invention fully automatically.
Vorteilhaft ist auch, wenn die Sicherheitsschaltung nach einer vorgegebenen Anzahl von Wechseln des Statussignales keine weitere aktive Zündung einleitet, da dieses auf einen andauernden Fehler der Hochdruckgasentladungslampe oder der Ansteuerschaltung schließen läßt.It is also advantageous if the safety circuit does not initiate any further active ignition after a predetermined number of changes in the status signal, since this indicates a persistent fault in the high-pressure gas discharge lamp or the control circuit.
Im folgenden soll ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung sowie des erfindungsgemäßen Verfahrens anhand der Zeichnung dargestellt und erläutert werden.An exemplary embodiment of the device according to the invention and of the method according to the invention will be illustrated and explained below with reference to the drawing.
Die einzige Figur skizziert den der erfindungsgemäßen Vorrichtung zugrundeliegenden Schaltungsaufbau.The only figure outlines the circuit structure on which the device according to the invention is based.
Eine Gleichspannungsquelle (B) - im allgemeinen ist dies die Fahrzeugbatterie - bestromt einen Spannungswandler (W), der die zum Betrieb der Hochdruckgasentladungslampe (GDL) erforderliche Wechselspannung zur Verfügung stellt. Eine dem Spannungswandler (W) nachgeschaltete Zündeinrichtung (Z) erzeugt überdies die zum Starten der Gasentladung erforderlichen Hochspannungsimpulse.A DC voltage source (B) - generally this is the vehicle battery - energizes a voltage converter (W), which provides the AC voltage required to operate the high-pressure gas discharge lamp (GDL). An ignition device (Z) connected downstream of the voltage converter (W) also generates the high-voltage pulses required to start the gas discharge.
Weiterhin ist eine Sicherheitsschaltung vorhanden, welche in Abhängigkeit vom Statussignal (Status) den Spannungswandler (W) steuert. Durch Ansteuerung des Spannungswandlers (W) kann die Sicherheitsschaltung insbesondere einen aktiven Zündvorgang der Hochdruckgasentladungslampe (GDL) einleiten. Weiterhin erzeugt die Sicherheitsschaltung beim Auftreten von Fehlern sowie unmittelbar nach Einschalten der Spannungsversorgung ein Fehlersignal (Error), welches an einem Eingang (R1) eines umsteuerbaren digitalen Speicherelementes (FF) anliegt und das von dem digitalen Speicherelement (FF) erzeugte Statussignal beeinflußt.There is also a safety circuit that controls the voltage converter (W) depending on the status signal (status). By actuating the voltage converter (W), the safety circuit can in particular initiate an active ignition process of the high-pressure gas discharge lamp (GDL). Furthermore, the safety circuit generates when Errors and immediately after switching on the power supply an error signal (error) which is present at an input (R 1 ) of a reversible digital storage element (FF) and which influences the status signal generated by the digital storage element (FF).
Eine Erfassungseinrichtung (E) erfaßt zwischen dem Spannungswandler (W) und der Zündeinrichtung (Z) die Parameter Lampenstrom (I) und Lampenspannung (U) und legt jeweils ein zu diesen Parametem proportionales Stromsignal (I1) und Spannungssignal (U1) an einen Komparator (X1) und einen Fensterkomparator (X2). Der Fensterkomparator (X2) erzeugt ein logisches H-Signal, wenn eine erste Stromschwelle (IS1) überschritten wird; er liefert ein L-Signal, wenn eine zweite Stromschwelle (IS2) unterschritten wird. Der Komparator (X1) kippt von L nach H, wenn eine Spannungsschwelle (US1) überschritten wird. Die Stromschwellen (IS1 und IS2) sind so gewählt, daß eine störungssichere Bestimmung des Lampenstromes garantiert ist. Der Wert der Spannungsschwelle (US1) liegt deutlich oberhalb der minimalen Lampen-Nennspannung und unterhalb der Leerlaufspannung, die notwendig ist, um einen Zündimpuls zu generieren.A detection device (E) detects the parameters lamp current (I) and lamp voltage (U) between the voltage converter (W) and the ignition device (Z) and applies a current signal (I1) and voltage signal (U1) proportional to these parameters to a comparator ( X1) and a window comparator (X2). The window comparator (X2) generates a logic H signal when a first current threshold (IS1) is exceeded; it delivers an L signal when a second current threshold (IS2) is undershot. The comparator (X1) tilts from L to H if a voltage threshold (US1) is exceeded. The current thresholds (IS1 and IS2) are selected so that an interference-free determination of the lamp current is guaranteed. The value of the voltage threshold (US1) is clearly above the minimum lamp nominal voltage and below the open circuit voltage, which is necessary to generate an ignition pulse.
Die Ausgangssignale der Komparatoren (X1, X2) sind mit dem Reset-Eingang (R) und dem Set-Eingang (S) des umsteuerbaren digitalen Speicherelementes (FF) verbunden. Das digitale Speicherelement (FF) ist hier als RS-Flipflop mit zwei Reset-Eingängen (R, R1) und einem Set-Eingang (S) ausgebildet, wobei der Set-Eingang (S) gegenüber den Reset-Eingängen (R, R1) Vorrang hat.The output signals of the comparators (X1, X2) are connected to the reset input (R) and the set input (S) of the reversible digital memory element (FF). The digital memory element (FF) is designed here as an RS flip-flop with two reset inputs (R, R 1 ) and a set input (S), the set input (S) compared to the reset inputs (R, R 1 ) takes precedence.
Das Ausgangssignal des umsteuerbaren digitalen Speicherelementes (FF) ist das Statussignal (Status) über den Betriebszustand der Hochdruckgasentladungslampe (GDL). Der Übergang des Statussignals (Status) von L nach H stellt einen aktiven Zündvorgang dar. In der Sicherheitsschaltung (Si) kann dieses digitale Statussignal (Status) für verschiedene Anwendungen und insbesondere zur Ansteuerung des Spannungswandlers verwendet werden.The output signal of the reversible digital storage element (FF) is the status signal (status) about the operating state of the high pressure gas discharge lamp (GDL). The transition of the status signal (status) from L to H represents an active ignition process. In the safety circuit (Si), this digital status signal (status) can be used for various applications and in particular for controlling the voltage converter.
Die Funktionsweise der skizzierten Schaltungsanordnung, welche das erfindungsgemäße Verfahren ausführt, ist folgende:The functioning of the circuit arrangement outlined, which carries out the method according to the invention, is as follows:
Beim Anschalten der Gleichspannungsquelle (B) an das Vorschaltgerät der Hochdruckgasentladungslampe (GDL) befindet sich das digitale Speicherelement (FF) durch ein von der Sicherheitsschaltung (Si) erzeugtes Fehlersignal (Error) in einer definierten Ruhelage: Status = L. Der Spannungswandler (W) erzeugt die maximale Leerlaufspannung; daraus resultiert nach einigen Millisekunden ein erster Zündimpuls an der Hochdruckgasentladungslampe (GDL). Wird die Hochdruckgasentladungslampe (GDL) ausreichend niederohmig, kommt es zum Stromfluß aus dem Spannungswandler (W). Dieser Lampenstrom (I) setzt über die Erfassungseinrichtung (E) den Fensterkomparator (X2) über den Set-Eingang (S) des digitalen Speicherelementes (FF) das Statussignal (Status) auf H. Verlöscht die Hochdruckgasentladungslampe (GDL) nach der Übernahme, wird das Signal am Set-Eingang (S) wieder zurückgenommen, das Statussignal (Status) bleibt jedoch gesetzt. Erst wenn die sofort ansteigende Wandlerspannung (U) so groß wird, daß das zur Lampenspannung (U) proportionale Spannungssignal (U1) die Spannungsschwelle (US1) überschreitet, wird das digitale Speicherelement (FF) über den Eingang (R) zurückgesetzt. Das Vorschaltsystem, bestehend aus Spannungswandler (W) und Zündeinrichtung (Z), erzeugt erneut eine aktive Zündung; kommt es zum Stromfluß, wird das Statussignal (Status) wieder H. Dieser Vorgang wiederholt sich, bis der Zündvorgang erfolgreich abgeschlossen ist oder bis eine definierte Anzahl von Statuswechseln erreicht ist und die Sicherheitsschaltung (Si) den Vorgang abbricht.When the DC voltage source (B) is connected to the ballast of the high-pressure gas discharge lamp (GDL), the digital storage element (FF) is in a defined idle state due to an error signal (Error) generated by the safety circuit (Si): Status = L. The voltage converter (W) generates the maximum open circuit voltage; this results in a first ignition pulse on the high pressure gas discharge lamp (GDL) after a few milliseconds. If the high-pressure gas discharge lamp (GDL) becomes sufficiently low-resistance, the current flows from the voltage converter (W). This lamp current (I) sets the window comparator (X2) via the detection device (E) to the status signal (status) via the set input (S) of the digital storage element (FF). The high-pressure gas discharge lamp (GDL) goes out after the takeover the signal at the set input (S) is withdrawn again, but the status signal (status) remains set. Only when the immediately increasing converter voltage (U) becomes so great that the voltage signal (U1) proportional to the lamp voltage (U) exceeds the voltage threshold (US1) is the digital memory element (FF) reset via the input (R). The ballast system, consisting of voltage converter (W) and ignition device (Z), generates an active ignition again; If the current flows, the status signal (status) becomes H. This process repeats itself until the ignition process has been successfully completed or until a defined number of status changes has been reached and the safety circuit (Si) aborts the process.
Kommt es während des Betriebs zu einer Unterbrechung im Lampenstrom (I), wechselt auch hier zunächst das Signal am Set-Eingang (S) des digitalen Speicherelementes (FF) auf L. Führt die ansteigende Lampenspannung (U) zu einem selbsttätigen Nachzünden, bevor am Eingang des Komparators (X1) die Spannungsschwelle (US1) erreicht wird, erfolgt kein Zurücksetzen des Statussignales (Status); die passive Zündung wird somit nicht gezählt.If there is an interruption in the lamp current (I) during operation, the signal at the set input (S) of the digital storage element (FF) also changes to L. Does the increasing lamp voltage (U) cause automatic re-ignition before on Input of the comparator (X1) the voltage threshold (US1) is reached, there is no reset of the status signal (status); the passive ignition is therefore not counted.
Überschreitet die Spannung (U1) am Komparatoreingang die Schwelle (US1), erfolgt keine passive Zündung und das Statussignal (Status) wird zurückgesetzt. Das Vorschaltsystem erzeugt jetzt einen Hochspannungsimpuls mit identischem Ablauf wie beim ersten Starten der Hochdruckgasentladungslampe (GDL). Dieser Vorgang wird also auch als aktive Zündung erkannt und gezählt.If the voltage (U1) at the comparator input exceeds the threshold (US1), there is no passive ignition and the status signal (status) is reset. The ballast system now generates a high-voltage pulse with the same sequence as when the high-pressure gas discharge lamp (GDL) was started for the first time. This process is also recognized and counted as active ignition.
- BB
- GleichspannungsquelleDC voltage source
- Ee
- Erfassungseinrichtungdetector
- FFFF
- (umsteuerbares) digitales Speicherelement(Reversible) digital storage element
- GDLGDL
- HochdruckgasentladungslampeHigh-pressure gas discharge lamp
- R, R1 R, R 1
- (Reset-) Eingänge (des digitalen Speicherelementes)(Reset) inputs (of the digital storage element)
- SS
- (Set-) Eingang (des digitalen Speicherelementes)(Set) input (of the digital storage element)
- SiSi
- Sicherheitsschaltungsafety circuit
- X1X1
- Komparatorcomparator
- X2X2
- Fensterkomparatorwindow
- ZZ
- Zündeinrichtungignition device
- II
- Lampenstromlamp current
- I1I1
- zum Lampenstrom proportionales Stromsignalcurrent signal proportional to lamp current
- UU
- Lampenspannunglamp voltage
- U1U1
- zur Lampenspannung proportionales Spannungssignalvoltage signal proportional to lamp voltage
- IS1IS1
- oberer Sollwert des Lampenstromes (obere Stromschwelle)upper setpoint of the lamp current (upper current threshold)
- IS2IS2
- unterer Sollwert des Lampenstromes (untere Stromschwelle)lower setpoint of lamp current (lower current threshold)
- US1US1
- Sollwert der Lampenspannung (Spannungsschwelle)Lamp voltage setpoint (voltage threshold)
- Errorerror
- Fehlersignalerror signal
- Statusstatus
- Statussignalstatus signal
Claims (5)
- Method for generating a status signal representing the operating state of a high-pressure gas discharge lamp in a motor vehicle, wherein an alternating current voltage is generated from a direct current voltage, the alternating current voltage of an ignition device (Z) is supplied for igniting the high-pressure gas discharge lamp (GDL), a lamp voltage (U) and a lamp current are measured, the actual value of the lamp voltage (U or U1) and of the lamp current (I or I1) is compared with a theoretical value, and wherein a status signal (status) is formed which is able to assume the values "Lamp on" and "Lamp off", characterised in that the status signal (status) is set and stored when the lamp current (I or I1) exceeds an upper theoretical value (IS1) and is rest when the lamp current drops below a lower theoretical value (IS2) and the lamp voltage (U or U1) exceeds a theoretical value (US1).
- Device for generating a status signal representing the operating state of a high-pressure gas discharge lamp in a motor vehicle with a direct current voltage source (B) which is connected to a voltage transformer (W), with an ignition device (Z) between the voltage transformer (W) and the high-pressure discharge lamp (GDL), and with a recording device (E) for recording the lamp voltage (U) and the lamp current (I), characterised in that the recording device (E) transmits a current signal (I1) proportional to the recorded lamp current (I) to the input of a window comparator (X2), in that the recording device (E) transmits a voltage signal (U1) proportional to the recorded lap voltage (U) to the input of a comparator (X1), in that the output of the comparator (X1) is connected to a first input ( R) and the output of the window comparator (X2) is connected to a second input (S) of a reversible digital storage element (FF), and in that the output signal of the reversible storage element (FF) is the status signal (status) representing the operating state of the high-pressure gas discharge lamp (GDL).
- Device according to Claim 2, characterised in that a safety circuit (Si) actuates the voltage transformer (W) for initiating an active ignition of the high-pressure gas discharge lamp (GDL) when the status signal (status) is reset.
- Device according to Claim 3, characterised in that the safety circuit transmits an error signal (error) when an error occurs and immediately after the voltage supply is switched on to an input (R1) of the reversible digital storage element (FF) for resetting the status signal (status).
- Device according to Claim 3 or 4, characterised in that the safety circuit prevents the initiation of an active ignition of the GDL by the disconnection of the voltage transformer when the number of changes of the status signal (status) exceeds a predetermined number.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19848757 | 1998-10-22 | ||
| DE19848757A DE19848757A1 (en) | 1998-10-22 | 1998-10-22 | Method and device for generating a status signal about the operating state of a high-pressure gas discharge lamp in a motor vehicle |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0996315A2 EP0996315A2 (en) | 2000-04-26 |
| EP0996315A3 EP0996315A3 (en) | 2000-05-10 |
| EP0996315B1 true EP0996315B1 (en) | 2004-04-28 |
Family
ID=7885317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99120661A Expired - Lifetime EP0996315B1 (en) | 1998-10-22 | 1999-10-19 | Method and apparatus for generating a status signal representing the operating state of a high-pressure gas discharge lamp in a motor vehicle |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0996315B1 (en) |
| AT (1) | ATE265799T1 (en) |
| DE (2) | DE19848757A1 (en) |
| ES (1) | ES2218931T3 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4017415C2 (en) * | 1989-06-02 | 1994-04-14 | Koito Mfg Co Ltd | Circuit arrangement for operating a high-pressure discharge lamp for a vehicle headlight |
| JP2587720B2 (en) * | 1990-10-19 | 1997-03-05 | 株式会社小糸製作所 | Lighting circuit for vehicle discharge lamps |
| DE4136488A1 (en) * | 1991-11-06 | 1993-05-13 | Bayer Ag | DIALKENYL COMPOUNDS, THEIR PRODUCTION AND USE AS A REACTIVE THINNER FOR OXIDATIVELY CROSSLINKING ALKYD RESINS |
| DE4136486A1 (en) * | 1991-11-06 | 1993-05-13 | Hella Kg Hueck & Co | High power gas discharge lamp ballast for ignition and operation of lamp - uses bridge stage switched between DC mode for lamp ignition and AC mode for subsequent operation of lamp |
| US5453667A (en) * | 1992-06-30 | 1995-09-26 | Toshiba Lighting & Technology Corporation | Inverter having frequency changing function |
| JP3447776B2 (en) * | 1993-09-17 | 2003-09-16 | 池田デンソー株式会社 | Discharge lamp lighting device |
| US5487088A (en) * | 1993-10-28 | 1996-01-23 | Infilco Degremont, Inc. | Apparatus for monitoring lamp system status |
| JP3280540B2 (en) * | 1995-05-12 | 2002-05-13 | 株式会社小糸製作所 | Discharge lamp lighting circuit |
| JP3210570B2 (en) * | 1996-02-29 | 2001-09-17 | 株式会社小糸製作所 | Discharge lamp lighting circuit |
| JP3210584B2 (en) * | 1996-07-25 | 2001-09-17 | 株式会社小糸製作所 | Discharge lamp lighting circuit |
-
1998
- 1998-10-22 DE DE19848757A patent/DE19848757A1/en not_active Withdrawn
-
1999
- 1999-10-19 DE DE59909313T patent/DE59909313D1/en not_active Expired - Lifetime
- 1999-10-19 EP EP99120661A patent/EP0996315B1/en not_active Expired - Lifetime
- 1999-10-19 AT AT99120661T patent/ATE265799T1/en not_active IP Right Cessation
- 1999-10-19 ES ES99120661T patent/ES2218931T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19848757A1 (en) | 2000-04-27 |
| ATE265799T1 (en) | 2004-05-15 |
| EP0996315A2 (en) | 2000-04-26 |
| ES2218931T3 (en) | 2004-11-16 |
| EP0996315A3 (en) | 2000-05-10 |
| DE59909313D1 (en) | 2004-06-03 |
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