EP1908337B1 - Adaptive regulation of the power of gas discharge lamps - Google Patents

Adaptive regulation of the power of gas discharge lamps Download PDF

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Publication number
EP1908337B1
EP1908337B1 EP06754719A EP06754719A EP1908337B1 EP 1908337 B1 EP1908337 B1 EP 1908337B1 EP 06754719 A EP06754719 A EP 06754719A EP 06754719 A EP06754719 A EP 06754719A EP 1908337 B1 EP1908337 B1 EP 1908337B1
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European Patent Office
Prior art keywords
value
desired value
lamp
gas discharge
difference
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EP06754719A
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German (de)
French (fr)
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EP1908337A1 (en
EP1908337B2 (en
Inventor
Stefan Zudrell-Koch
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Tridonic GmbH and Co KG
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Tridonicatco GmbH and Co KG
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    • 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
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • 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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions

Definitions

  • the invention relates to methods for controlling the operation of a gas discharge lamp.
  • Background of the present invention is quite generally the power control of gas discharge lamps, which are operated with alternating voltage, by means of an upstream operating device.
  • gas discharge lamps which are operated with alternating voltage, by means of an upstream operating device.
  • a ballast in particular an electronic ballast.
  • the ballast will then generate a drive value for the lamp power, this drive value in the case of AC powered gas discharge lamps, for example, the frequency of the supplied AC voltage, thus exploiting a dimming utilizing the known resonance curve of such lamps in a resonant load circuit.
  • the invention addresses this point and proposes a technique to ensure the power regulation of a gas discharge lamp even under the low dimming / low temperature conditions mentioned.
  • the central idea of the invention is that under such conditions the exact observance of the externally specified desired value (dimming value) is given a lower priority than the operation of the lamp at a stable operating point.
  • the invention thus according to a first aspect provides a method for controlling the operation of a gas discharge lamp.
  • externally setpoint for the lamp power ie a dimming setpoint is specified.
  • a parameter on the lamp is detected, which is an indication of the lamp power.
  • This parameter is returned as the actual value.
  • a drive value for the lamp power is generated as a function of the difference of the setpoint value and the said returned actual value, which is weighted by a controller function.
  • the setpoint is modified when it is detected on the basis of the controller difference that instabilities in the control loop are present.
  • the control loop comprises in particular the load circuit with the gas discharge lamp.
  • the modification of the setpoint will result in an increase of the setpoint above the externally set value, as regularly increasing the setpoint will result in more stable operation with higher dimming power.
  • Instability in the control loop can be detected when the controller difference, i. the difference between setpoint and actual value, has temporal variations. These can be cyclical, for example.
  • an instability of the control loop can also be detected if there is a static controller difference that can not be compensated by the normal controller function.
  • the modification of the setpoint may be limited to low external setpoints and / or low temperatures.
  • the modification of the setpoint can of course be canceled as soon as the control loop is recognized as stable again. Thus, then the lamp power will approach the externally specified value.
  • the modification of the desired value can be carried out continuously.
  • the modification of the reference value can be carried out with a time constant that is large in relation to the instabilities of the control loop and the dynamics of the control loop.
  • Such a controller function can be implemented digitally, but also analogously or hybrid.
  • control module for a lamp operating device which is designed for such a method and may be, for example, an ASIC or a microcontroller.
  • the invention also relates to control gear for gas discharge lamps, such as electronic ballasts (electronic ballasts for fluorescent lamps or high-pressure gas discharge lamps), which have such a control module or are suitable for supporting the aforementioned method.
  • electronic ballasts electronic ballasts for fluorescent lamps or high-pressure gas discharge lamps
  • the invention also relates to a computer software program product that implements such a method when running on a computing device.
  • Fig. 1 an electronic regulator circuit for the operation of a gas discharge lamp 2 is provided with the reference numeral 1.
  • This regulator circuit 1 can be implemented analog and / or digital.
  • the illustrated functions may be implemented by a microcontroller, and in particular by an ASIC.
  • the lamp 2 is part of a load circuit 3, which has an RL resonance circuit 4.
  • variable resistor Due to the operating point dependent impedance of a gas discharge lamp, this is shown schematically as a variable resistor.
  • the load circuit 3 is a high-frequency alternating voltage supplied, which is tapped at the midpoint 5 of a half-bridge circuit 6 with two electronic switches (FETs). The switches of the half-bridge are in turn supplied with a DC supply voltage V bus .
  • the circuit 1, which is part of an operating device for the lamp 2, is connected to a data bus 7, which can supply various commands, in particular set values for the power of the lamp 2 (so-called dimming values) to a dimming interface 8.
  • the dimming interface 8 is connected to a system controller 9 and is available this in bidirectional communication, wherein the system controller 9 has functions implemented via firmware.
  • the system controller is with a system memory 10 in bidirectional communication.
  • the circuit 1 has a system clock 11.
  • a signal 12 is tapped, which reflects the current power of the lamp 2.
  • Examples of such a signal are, for example, the lamp voltage and / or the lamp current.
  • This signal 12 is supplied to the circuit 1 and digitized there by an AD converter 13.
  • the system controller 9 depending on the externally supplied setpoint (Dimmwert) before a control value for the control circuit.
  • This predetermined control value is compared with the detected and digitized signal 12 and then fed to a controller 14 as a control difference.
  • a controller 14 a known control algorithm is implemented.
  • the controller 14 generates depending on the detected controller difference, a control value for a driver circuit 15, which in turn drives the switches of the half-bridge circuit 6, for example by means of PWM modulation.
  • the control value which is compared with the actual value 12, now depends not only on the externally predetermined value of the dimming interface 8. Rather, a controller difference detection unit 16 is provided which evaluates the controller difference and in particular determines the time profile and the static properties of the controller difference.
  • controller difference detection unit 16 may be configured to be statically unregulated Determine controller differences and / or detect instabilities of the controller difference, in particular cyclic type, and to send a corresponding controller difference detection signal to the system controller 9.
  • the system controller 9 can preset the control value deviating from the received via the dimming interface 8 external setpoint depending on the detected specifics in the controller difference and / or specifications for the controller difference detection circuit 16 do.
  • controller difference detection unit 16 can also be part of the controller 9 in the form of an evaluation algorithm.
  • controller difference detection unit 16 may also be designed as a (in particular hard-wired) logic circuit or as a hybrid unit.
  • control difference is preferably filtered by a hardwired logic circuit with respect to the amplitude and the time changes (see the "filtered" waveform in FIG. 2 ). That is, only when there is a change over a defined threshold during a defined period of time, a signal "Illegal controller difference" is set.
  • This signal is then evaluated by the firmware of the controller 9 and counted up when set signal, the setpoint and counted down when not set signal.
  • the step size and the clock rate of counting can be adjustable, for example, depending on the lamp power.
  • system controller 9 may also have the properties, in particular the dynamic properties of the controller function implemented in the controller 14 to adjust. For this purpose, for example, he can access parameter sets in the system memory 10.
  • Fig. 2 An example of this is in Fig. 2 shown.
  • the external predetermined setpoint is changed from a higher dimming value S2 to a low dimming value S1.
  • the controller difference can be as in Fig. 2 can be filtered, wherein at the time t 2, the filtered controller difference value exceeds a predetermined setpoint.
  • the system controller 9 causes a corresponding filtered signal from the controller difference detection unit 16 is supplied, that the target value is increased beyond the actually externally specified value S1 addition, in order to achieve a stabilization of the control loop.
  • the modulation of the target value carried out by the system controller 9 is carried out continuously in both directions (i.e., both in the change other than the externally set value and in the approach).
  • the time constant is relatively large (in comparison to the typical instabilities of the control loop or the dynamics of the control loop), so that it can be continuously checked whether the setpoint further approximated to the externally specified value, so usually can be further reduced.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

The invention relates to a method for regulating the operation of a gas discharge lamp, said method comprising the following steps: a nominal value for the lamp power is set externally, a parameter indicating the actual lamp power is recorded and reinjected as the actual value, and a control value for the lamp power is generated according to the difference between the nominal value and the actual value, weighted by a regulator function. The nominal value is modified if instabilities of the regulating loop are identified on the basis of the regulator difference between the nominal value and the actual value.

Description

Die Erfindung bezieht sich auf Verfahren zur Regelung des Betriebs einer Gasentladungslampe.The invention relates to methods for controlling the operation of a gas discharge lamp.

Hintergrund der vorliegenden Erfindung ist ganz allgemein die Leistungsregelung von Gasentladungslampen, die mit Wechselspannung betrieben werden, mittels eines vorgeschalteten Betriebsgeräts. Im Falle von Leuchtstofflampen oder Hochdruck-Gasentladungslampen wird üblicherweise von einem Vorschaltgerät, insbesondere einem elektronischen Vorschaltgerät gesprochen.Background of the present invention is quite generally the power control of gas discharge lamps, which are operated with alternating voltage, by means of an upstream operating device. In the case of fluorescent lamps or high-pressure gas discharge lamps is usually spoken of a ballast, in particular an electronic ballast.

Bekannt ist es dabei, einem derartigen Betriebsgerät extern, beispielsweise über einen angeschlossenen Datenbus Sollwerte zuzuführen, die eine anzusteuernde Lampenleistung vorgeben.It is known in this case to externally supply to such an operating device, for example via a connected data bus, setpoints that specify a lamp power to be controlled.

Das Vorschaltgerät wird dann einen Ansteuerwert für die Lampenleistung erzeugen, wobei dieser Ansteuerwert im Fall von mit Wechselspannung versorgten Gasentladungslampen beispielsweise die Frequenz der zugeführten Wechselspannung ist, um somit ein Dimmen unter Ausnutzung der bekannten Resonanzkurve derartiger Lampen in einem Resonanzlastkreis auszunützen.The ballast will then generate a drive value for the lamp power, this drive value in the case of AC powered gas discharge lamps, for example, the frequency of the supplied AC voltage, thus exploiting a dimming utilizing the known resonance curve of such lamps in a resonant load circuit.

Im Druchschrift US2003/0227264 A1 werden Instabilitäten einer Regelschleife auf Grundlage der Reglerdifferenz zwischen Soll- und Istwert erkannt.In the inscription US2003 / 0227264 A1 instabilities of a control loop are detected on the basis of the controller difference between setpoint and actual value.

Im Druchschrift US2005/0151483 A1 werden Instabilitäten in einer Lampe erkannt durch Schwankungen in der Lampenspannung und die Lampenleistung wird stufenweise erhöht um die Lampe zu stabilisieren, damit zeitliche Schwankungen in der Lampenhelligkeit beseitigt werden.In the inscription US2005 / 0151483 A1 Instabilities in a lamp are detected by fluctuations in the lamp voltage and the lamp power is gradually increased to stabilize the lamp so that temporal variations in lamp brightness are eliminated.

Es ist weiterhin bekannt, einen Parameter, wie beispielsweise die Lampenspannung und/oder den Lampenstrom zu erfassen, der die Lampenleistung wiedergibt. Ein derartiger Parameter wird also an das Betriebsgerät zurückgeführt und dann mit dem extern vorgegebenen Sollwert verglichen. Daraus ergibt sich wiederum eine Regeldifferenz, die durch einen mittels soft- und/oder hardwareimplementierten Regelalgorithmus gewichtet wird, um einen modifizierten Ansteuerwert für die Lampenleistung zu erzeugen. Ziel einer derartigen Regelung ist es natürlich, die Regeldifferenz auf Null zu führen, so dass die tatsächlich vorliegende Lampenleistung (so wie sie durch den entsprechenden Parameter wiedergegeben ist) dem extern vorgegebenen Sollwert weitgehend entspricht.It is also known to detect a parameter, such as the lamp voltage and / or the lamp current, which represents the lamp power. Such a parameter is thus returned to the operating device and then compared with the externally set value. This in turn results in a control difference by a soft- and / or hardware-implemented control algorithm is weighted to produce a modified drive value for the lamp power. The aim of such a scheme is, of course, to bring the control difference to zero, so that the actual lamp power present (as represented by the corresponding parameter) largely corresponds to the externally set value.

Neben der getreuen Wiedergabe des externen Sollwerts ist es natürlich auch ein Ziel einer jeden Leistungsregelung für Gasentladungslampen einen stabilen Betrieb auch bei unterschiedlichen Bedingungen, beispielsweise unterschiedlichen Dimmstufen und unterschiedlichen Umgebungstemperaturen zu gewährleisten. Bereits bei normalen Bedingungen (hohe Dimmwerte, übliche Umgebungstemperaturen) ist diese Aufgabe aufgrund der extremen Nichtlinearität einer Gasentladungslampe durchaus anspruchsvoll.In addition to the faithful reproduction of the external setpoint, it is of course also an objective of any power control for gas discharge lamps to ensure stable operation even under different conditions, for example different dimming levels and different ambient temperatures. Already under normal conditions (high dimming values, usual ambient temperatures) this task is quite demanding due to the extreme nonlinearity of a gas discharge lamp.

Gerade bei niedrigen Dimmwerten wird die Regelung durch die nichtlineare Abhängigkeit der Leistungsaufnahme von der Betriebsfrequenz erschwert. Geringste Frequenzänderungen könne daher in diesem Fall starke Änderungen der Lampenleistung bewirken.Precisely at low dimming values, the regulation is made more difficult by the non-linear dependence of the power consumption on the operating frequency. Lowest frequency changes could therefore cause strong changes in lamp power in this case.

Die Erfindung setzt an diesem Punkt an und schlägt eine Technik vor, um die Leistungsregelung einer Gasentladungslampe auch unter den genannten Bedingungen niedriger Dimmwerte/niedrige Temperaturen zu gewährleisten.The invention addresses this point and proposes a technique to ensure the power regulation of a gas discharge lamp even under the low dimming / low temperature conditions mentioned.

Zentraler Gedanke der Erfindung ist es dabei, dass bei derartigen Bedingungen die genaue Einhaltung des extern vorgegebenen Sollwerts (Dimmwerts) eine niedrigere Priorität als dem Betrieb der Lampe bei einem stabilen Arbeitspunkt eingeräumt wird.The central idea of the invention is that under such conditions the exact observance of the externally specified desired value (dimming value) is given a lower priority than the operation of the lamp at a stable operating point.

Genauer gesagt wird diese Aufgabe durch die Merkmale der unabhängigen Ansprüche gelöst. Die abhängigen Ansprüche bilden den zentralen Gedanken der Erfindung in besonders vorteilhafter Weise weiter.More specifically, this object is solved by the features of the independent claims. The dependent claims form the central idea of the invention in a particularly advantageous manner on.

Die Erfindung sieht also gemäß einem ersten Aspekt ein Verfahren zur Regelung des Betriebs einer Gasentladungslampe vor. Dabei wird extern ein Sollwert für die Lampenleistung, also ein Dimm-Sollwert vorgegeben. Es wird ein Parameter an der Lampe erfasst, der ein Indiz für die Lampenleistung ist. Dieser Parameter wird als Istwert zurückgeführt. Schließlich wird ein Ansteuerwert für die Lampenleistung abhängig von der durch eine Reglerfunktion gewichteten Differenz des Sollwerts und des genannten zurückgeführten Istwerts erzeugt. Erfindungsgemäß wird dabei der Sollwert modifiziert, wenn auf Grundlage der Reglerdifferenz erkannt wird, dass Instabilitäten in der Regelschleife vorliegen. Die Regelschleife umfasst insbesondere den Lastkreis mit der Gasentladungslampe. Durch die Modifizierung des Sollwerts wird also einem korrekten Betrieb mit stabilen Arbeitspunkt eine höhere Priorität als der genauen Abbildung des extern vorgegebenen Sollwerts eingeräumt.The invention thus according to a first aspect provides a method for controlling the operation of a gas discharge lamp. In this case, externally setpoint for the lamp power, ie a dimming setpoint is specified. A parameter on the lamp is detected, which is an indication of the lamp power. This parameter is returned as the actual value. Finally, a drive value for the lamp power is generated as a function of the difference of the setpoint value and the said returned actual value, which is weighted by a controller function. According to the invention, the setpoint is modified when it is detected on the basis of the controller difference that instabilities in the control loop are present. The control loop comprises in particular the load circuit with the gas discharge lamp. By modifying the setpoint, therefore, a correct operation with stable operating point is given a higher priority than the exact mapping of the externally specified setpoint.

Üblicherweise wird die Modifikation des Sollwerts in einer Erhöhung des Sollwerts über den extern vorgegebenen Wert hinaus bestehen, da regelmäßig eine Erhöhung des Sollwerts zu einem stabileren Betrieb bei höherer Dimmleistung führt.Usually, the modification of the setpoint will result in an increase of the setpoint above the externally set value, as regularly increasing the setpoint will result in more stable operation with higher dimming power.

Eine Instabilität in der Regelschleife kann erkannt werden, wenn die Reglerdifferenz, d.h. die Differenz zwischen Sollwert und Istwert, zeitliche Schwankungen aufweist. Diese können beispielsweise zyklischer Natur sein.Instability in the control loop can be detected when the controller difference, i. the difference between setpoint and actual value, has temporal variations. These can be cyclical, for example.

Alternativ oder zusätzlich kann eine Instabilität der Regelschleife auch dann erkannt werden, wenn eine statische Reglerdifferenz besteht, die durch die normale Reglerfunktion nicht ausgeregelt werden kann.Alternatively or additionally, an instability of the control loop can also be detected if there is a static controller difference that can not be compensated by the normal controller function.

Die Modifikation des Sollwerts kann auf niedrige externe Sollwerte und/oder niedrige Temperaturen beschränkt werden.The modification of the setpoint may be limited to low external setpoints and / or low temperatures.

Die Modifikation des Sollwerts kann natürlich zurückgenommen werden, sobald die Regelschleife wieder als stabil erkannt wird. Somit wird sich dann auch die Lampenleistung dem extern vorgegebenen Sollwert annähern.The modification of the setpoint can of course be canceled as soon as the control loop is recognized as stable again. Thus, then the lamp power will approach the externally specified value.

Die Modifikation des Sollwerts kann kontinuierlich durchgeführt werden.The modification of the desired value can be carried out continuously.

Die Modifikation des Sollwerts kann mit einer Zeitkonstante ausgeführt werden, die im Verhältnis zu den Instabilitäten der Regelschleife gross und der Dynamik der Regelschleife ist.The modification of the reference value can be carried out with a time constant that is large in relation to the instabilities of the control loop and the dynamics of the control loop.

Eine derartige Reglerfunktion kann digital, aber auch analog bzw. hybrid implementiert sein.Such a controller function can be implemented digitally, but also analogously or hybrid.

Ein weiterer Aspekt der Erfindung bezieht sich auf einen Steuerbaustein für ein Lampenbetriebsgerät, der für ein derartiges Verfahren ausgelegt ist und beispielsweise ein ASIC oder ein Mikrocontroller sein kann.Another aspect of the invention relates to a control module for a lamp operating device, which is designed for such a method and may be, for example, an ASIC or a microcontroller.

Die Erfindung bezieht sich auch auf Betriebsgeräte für Gasentladungslampen, wie beispielsweise EVGs (elektronische Vorschaltgeräte für Leuchtstofflampen oder Hochdruck-Gasentladungslampen), die einen derartigen Steuerbaustein aufweisen bzw. zur Unterstützung des eingangs genannten Verfahrens geeignet sind.The invention also relates to control gear for gas discharge lamps, such as electronic ballasts (electronic ballasts for fluorescent lamps or high-pressure gas discharge lamps), which have such a control module or are suitable for supporting the aforementioned method.

Schließlich bezieht sich die Erfindung auch auf ein Computersoftware-Programmprodukt, dass ein derartiges Verfahren implementiert, wenn es auf einer Recheneinrichtung läuft.Finally, the invention also relates to a computer software program product that implements such a method when running on a computing device.

Weitere Merkmale, Vorteile und Eigenschaften der vorliegenden Erfindung sollen nunmehr Bezug nehmend auf die Figuren der in der Anlage beigefügten Zeichnungen und anhand der folgenden detaillierten Beschreibung eines Ausführungsbeispiels näher erläutert werden.

Fig. 1
zeigt dabei eine schematische Ansicht einer erfindungsgemäßen Reglerschaltung und
Fig. 2
zeigt zeitliche Abläufe von Parametern in der Reglerschleife.
Further features, advantages and characteristics of the present invention will now be explained in more detail with reference to the figures of the attached drawings and to the following detailed description of an embodiment.
Fig. 1
shows a schematic view of a regulator circuit according to the invention and
Fig. 2
shows temporal sequences of parameters in the controller loop.

In Fig. 1 ist eine elektronische Reglerschaltung für den Betrieb einer Gasentladungslampe 2 mit dem Bezugszeichen 1 versehen. Diese Reglerschaltung 1 kann analog und/oder digital implementiert sein. Beispielsweise können die dargestellten Funktionen durch einen Mikrocontroller und insbesondere durch ein ASIC implementiert werden. Die Lampe 2 ist Teil eines Lastkreises 3, der eine RL-Resonanzschaltung 4 aufweist.In Fig. 1 an electronic regulator circuit for the operation of a gas discharge lamp 2 is provided with the reference numeral 1. This regulator circuit 1 can be implemented analog and / or digital. For example, the illustrated functions may be implemented by a microcontroller, and in particular by an ASIC. The lamp 2 is part of a load circuit 3, which has an RL resonance circuit 4.

Aufgrund der vom Betriebspunkt abhängigen Impedanz einer Gasentladungslampe ist diese schematisch als sich veränderbarer Widerstand dargestellt.Due to the operating point dependent impedance of a gas discharge lamp, this is shown schematically as a variable resistor.

Dem Lastkreis 3 wird eine hochfrequente Wechselspannung zugeführt, die am Mittenpunkt 5 einer Halbbrückenschaltung 6 mit zwei elektronischen Schaltern (FETs) abgegriffen wird. Die Schalter der Halbbrücke sind wiederum mit einer DC-Versorgungsspannung Vbus versorgt.The load circuit 3 is a high-frequency alternating voltage supplied, which is tapped at the midpoint 5 of a half-bridge circuit 6 with two electronic switches (FETs). The switches of the half-bridge are in turn supplied with a DC supply voltage V bus .

Wie in der Figur weiterhin ersichtlich, ist die Schaltung 1, die Teil eines Betriebsgeräts für die Lampe 2 ist, an eine Datenbusleitung 7 angeschlossen, die verschiedenartige Befehle, insbesondere Sollwerte für die Leistung der Lampe 2 (sogenannte Dimmwerte) einer Dimmschnittstelle 8 zuführen kann. Die Dimmschnittstelle 8 ist mit einem Systemcontroller 9 verbunden und steht mit diesem in bidirektionaler Kommunikation, wobei der System-Controller 9 über Firmware implementierte Funktionen aufweist. Der System-Controller ist mit einem Systemspeicher (system memory) 10 in bidirektionaler Kommunikation.As can also be seen in the figure, the circuit 1, which is part of an operating device for the lamp 2, is connected to a data bus 7, which can supply various commands, in particular set values for the power of the lamp 2 (so-called dimming values) to a dimming interface 8. The dimming interface 8 is connected to a system controller 9 and is available this in bidirectional communication, wherein the system controller 9 has functions implemented via firmware. The system controller is with a system memory 10 in bidirectional communication.

Weiterhin weist die Schaltung 1 wie üblich einen Systemtaktgeber (System Clock) 11 auf.Furthermore, as usual, the circuit 1 has a system clock 11.

Vom Lastkreis 3 wird ein Signal 12 abgegriffen, das die aktuelle Leistung der Lampe 2 wiedergibt. Beispiele für ein derartiges Signal sind beispielsweise die Lampenspannung und/oder der Lampenstrom.From the load circuit 3, a signal 12 is tapped, which reflects the current power of the lamp 2. Examples of such a signal are, for example, the lamp voltage and / or the lamp current.

Dieses Signal 12 wird der Schaltung 1 zugeführt und dort durch einen AD-Converter 13 digitalisiert.This signal 12 is supplied to the circuit 1 and digitized there by an AD converter 13.

Der Systemcontroller 9 gibt abhängig von dem extern zugeführten Sollwert (Dimmwert) einen Stellwert für die Regelschaltung vor. Dieser vorgegebene Stellwert wird mit dem erfassten und digitalisierten Signal 12 verglichen und dann als Regeldifferenz einem Regler 14 zugeführt. In dem Regler 14 ist ein an sich bekannter Regelalgorithmus implementiert. Der Regler 14 erzeugt abhängig von der erfassten Reglerdifferenz einen Ansteuerwert für eine Treiberschaltung 15, die wiederum die Schalter der Halbbrückenschaltung 6 beispielsweise mittels PWM-Modulation ansteuert.The system controller 9, depending on the externally supplied setpoint (Dimmwert) before a control value for the control circuit. This predetermined control value is compared with the detected and digitized signal 12 and then fed to a controller 14 as a control difference. In the controller 14, a known control algorithm is implemented. The controller 14 generates depending on the detected controller difference, a control value for a driver circuit 15, which in turn drives the switches of the half-bridge circuit 6, for example by means of PWM modulation.

Erfindungsgemäß hängt nunmehr der Stellwert, der mit dem Istwert 12 verglichen wird, nicht nur von dem extern vorgegebenen Wert von der Dimmschnittstelle 8 ab. Vielmehr ist eine Reglerdifferenz-Erfassungseinheit 16 vorgesehen, die die Reglerdifferenz auswertet und insbesondere den zeitlichen Verlauf sowie die statischen Eigenschaften der Reglerdifferenz ermittelt.According to the invention, the control value, which is compared with the actual value 12, now depends not only on the externally predetermined value of the dimming interface 8. Rather, a controller difference detection unit 16 is provided which evaluates the controller difference and in particular determines the time profile and the static properties of the controller difference.

Beispielsweise kann die Reglerdifferenz-Erfassungseinheit 16 dazu ausgelegt sein, statisch nicht ausgeregelte Reglerdifferenzen zu ermitteln und/oder Instabilitäten der Reglerdifferenz, insbesondere zyklischer Art, zu erfassen und ein dementsprechendes Reglerdifferenz-Erfassungssignal an den System-Controller 9 zu senden.For example, the controller difference detection unit 16 may be configured to be statically unregulated Determine controller differences and / or detect instabilities of the controller difference, in particular cyclic type, and to send a corresponding controller difference detection signal to the system controller 9.

Wenn also die Reglerdifferenz-Erfassungseinheit 16 derartige Merkmale der Reglerdifferenz erfasst, kann der System-Controller 9 abhängig von den erfassten Besonderheiten in der Reglerdifferenz den Stellwert abweichend von dem über die Dimmschnittstelle 8 empfangenen externen Sollwert vorgeben und/oder Vorgaben für die Reglerdifferenz-Erfassungsschaltung 16 machen.If, therefore, the controller difference detection unit 16 detects such characteristics of the controller difference, the system controller 9 can preset the control value deviating from the received via the dimming interface 8 external setpoint depending on the detected specifics in the controller difference and / or specifications for the controller difference detection circuit 16 do.

Die Reglerdifferenz-Erfassungseinheit 16 kann im übrigen auch Teil des Controllers 9 sein in Form eines Auswertealgorithmus implementiert sein.Incidentally, the controller difference detection unit 16 can also be part of the controller 9 in the form of an evaluation algorithm.

Allerdings kann die Reglerdifferenz-Erfassungseinheit 16 auch als (insbesondere festverdrahtete) Logikschaltung oder als Hybrideinheit ausgebildet sein.However, the controller difference detection unit 16 may also be designed as a (in particular hard-wired) logic circuit or as a hybrid unit.

Bevorzugt wird die Regeldifferenz in einem ersten Schritt von einer festverdrahtete Logikschaltung in Bezug auf die Amplitude und die zeitlichen Änderungen gefiltert (siehe Signalverlauf "Gefiltert" in Figur 2). D.h., erst wenn eine Änderung über einem definierten Schwellenwert während einer definierten Zeitdauer besteht, wird ein Signal "unzulässige Reglerdifferenz" gesetzt.In a first step, the control difference is preferably filtered by a hardwired logic circuit with respect to the amplitude and the time changes (see the "filtered" waveform in FIG FIG. 2 ). That is, only when there is a change over a defined threshold during a defined period of time, a signal "Illegal controller difference" is set.

Dieses Signal wird dann von der Firmware des Controllers 9 ausgewertet und bei gesetztem Signal der Sollwert hochgezählt und bei nicht gesetztem Signal heruntergezählt. Die Schrittweite und die Taktrate des Zählens kann einstellbar sein, bspw. in Abhängigkeit von der Lampenleistung.This signal is then evaluated by the firmware of the controller 9 and counted up when set signal, the setpoint and counted down when not set signal. The step size and the clock rate of counting can be adjustable, for example, depending on the lamp power.

Im übrigen kann der System-Controller 9 auch ggf. die Eigenschaften, insbesondere die dynamischen Eigenschaften der in dem Regler 14 implementierten Reglerfunktion einstellen. Gerade zu diesem Zweck kann er beispielsweise Parametersätze in dem Systemspeicher 10 zugreifen.Otherwise, the system controller 9 may also have the properties, in particular the dynamic properties of the controller function implemented in the controller 14 to adjust. For this purpose, for example, he can access parameter sets in the system memory 10.

Wenn die Lampe 2 bei niedrigen Temperaturen und/oder niedrigen Dimmwerten betrieben wird, ist es ein bekanntes Phänomen, dass die Regelschleife instabil wird, was sich darin äußert, dass eine statische, nicht ausregelbare Reglerdifferenz entsteht und/oder die Regeldifferenz hohe Instabilitäten (Schwankungen) aufweist.If the lamp 2 is operated at low temperatures and / or low dimming values, it is a well-known phenomenon that the control loop becomes unstable, which manifests itself as a static, irreversible controller difference and / or the control difference high instabilities (fluctuations) having.

Ein Beispiel dafür ist in Fig. 2 dargestellt. In Fig. 2 ist angenommen, dass zu einem Zeitpunkt t1 der externe vorgegebene Sollwert von einem höheren Dimmwert S2 auf einen niedrigen Dimmwert S1 geändert wird.An example of this is in Fig. 2 shown. In Fig. 2 It is assumed that at a time t 1, the external predetermined setpoint is changed from a higher dimming value S2 to a low dimming value S1.

Bei diesem Sollwertsprung ergibt sich eine übliche und als solche unproblematische verhältnismäßig kurzzeitige Reglerdifferenz, die wie in Fig. 2 ersichtlich ausgeregelt werden kann. Allerdings treten bei dem Betrieb bei niedrigem Sollwert, d.h. nach dem Zeitpunkt t1, beginnend etwa mit dem Zeitpunkt t2 Stabilitäten in der Reglerdifferenz auf, die sich resonanzartig in steigenden im wesentlichen zyklischen Amplituden aufschwingen können.In this setpoint jump results in a usual and as such unproblematic relatively short-term controller difference, as in Fig. 2 can be corrected. However, in the case of operation at a low setpoint value, ie after time t 1 , starting at about the time t 2, stabilities occur in the controller difference, which can soar up in response to increasing substantially cyclic amplitudes.

Die Reglerdifferenz kann wie in Fig. 2 dargestellt gefiltert werden, wobei zu dem Zeitpunkt t2 der gefilterte Reglerdifferenzwert einen vorgegebenen Sollwert überschreitet. Zu einem Zeitpunkt t3, bei dem also anhand eines erneuten Überschreitens des zulässigen Maximalwerts für die Reglerdifferenz eine zyklische Instabilität der Reglerdifferenz und somit eine Instabilität der Reglerschleife erkannt wird, veranlasst der System-Controller 9, dem ein entsprechendes gefiltertes Signal von der Reglerdifferenz-Erfassungseinheit 16 zugeführt wird, dass der Sollwert über den eigentlich extern vorgegebenen Sollwert S1 hinaus erhöht wird, um eine Stabilisierung der Regelschleife zu erzielen. Im dargestellten Beispiel sie angenommen, dass sich durch die Erhöhung bis zu einem Zeitpunkt t4 tatsächlich wie anhand des gefilterten Reglerdifferenzsignals erkannt, eine Stabilisierung der Regelschleife ergeben hat. Allerdings wird zu einem Zeitpunkt t5 festgestellt, dass die Zurücknahme des Sollwerts zwischen dem Zeitpunkt t4 und t5 durch den System-Controller 9, um also die Leistung der Lampe 2 wieder näher an den extern vorgegebenen Dimmwert 8 zu bringen, sich die Regelschleife wieder destabilisiert hat.The controller difference can be as in Fig. 2 can be filtered, wherein at the time t 2, the filtered controller difference value exceeds a predetermined setpoint. At a point in time t 3 , in which a cyclical instability of the controller difference and thus an instability of the controller loop is detected on the basis of a renewed exceeding of the permissible maximum value for the controller difference, the system controller 9 causes a corresponding filtered signal from the controller difference detection unit 16 is supplied, that the target value is increased beyond the actually externally specified value S1 addition, in order to achieve a stabilization of the control loop. In the example shown, it is assumed that the increase up to a point in time t 4 actually results in the same way the filtered controller difference signal detected, has resulted in a stabilization of the control loop. However, it is determined at a time t 5 that the withdrawal of the desired value between the time t 4 and t 5 by the system controller 9, so as to bring the power of the lamp 2 closer to the externally predetermined dimming value 8 again, the control loop has destabilized again.

Dies ist ein Anlaß für den System-Controller 9, wiederum kontinuierlich (und nicht etwa durch einen Sollwertsprung) in einem Zeitraum zwischen den Zeitpunkten t5 und t6 den Sollwert über den extern vorgegebenen Sollwert hinaus zu erhöhen.This is a cause for the system controller 9, again continuously (and not by a setpoint jump) in a period between the times t 5 and t 6 to increase the target value beyond the externally set value addition.

Es ist festzuhalten, dass die von dem System-Controller 9 ausgeführte Modulation des Sollwerts in beiden Richtungen (d.h. sowohl in der Änderung abweichend vom extern vorgegeben Wert wie auch beider Annäherung) kontinuierlich ausgeführt wird. Die Zeitkonstante ist verhältnismässig gross (im Vergleich zu den typischeg Instabilitäten der Regelschleife bzw. der Dynamik der Regelschleife), so dass laufend überprüft werden kann, ob der Sollwert weiter an den extern vorgegeben Wert angenähert, also üblicherweise weiter erniedrigt werden kann.It should be noted that the modulation of the target value carried out by the system controller 9 is carried out continuously in both directions (i.e., both in the change other than the externally set value and in the approach). The time constant is relatively large (in comparison to the typical instabilities of the control loop or the dynamics of the control loop), so that it can be continuously checked whether the setpoint further approximated to the externally specified value, so usually can be further reduced.

Claims (13)

  1. Method for regulating the operation of a gas discharge lamp,
    having the following steps:
    - external presetting of a desired value for the lamp power,
    - acquisition and feedback of a parameter that reproduces the actual lamp power as an actual value, and
    - generation of a control value for the lamp power as a function of the difference between the desired value and the actual value that is weighted by a regulator function,
    wherein the desired value is increased internally above the externally preset desired value if instabilities of the regulating loop are identified on the basis of the regulator difference between the desired value and the actual value.
  2. Method according to claim 1,
    wherein the desired value is modified if the regulator difference shows temporal fluctuations.
  3. Method according to claim 1 or 2,
    wherein the desired value is modified if there is a static regulator difference.
  4. Method according to one of the preceding claims, wherein the desired value is only modified in the case of low external desired values.
  5. Method according to one of the preceding claims, wherein the modification of the desired value is retracted again as soon as the regulating loop is stable again.
  6. Method according to one of the preceding claims, wherein the modification of the desired value is carried out continuously.
  7. Method according to one of the preceding claims, wherein the modification of the desired value is executed with a time constant which is large in relation to the instabilities of the regulating loop.
  8. Method according to one of the preceding claims, wherein the regulator function is implemented digitally.
  9. Control module for a lamp-operating unit which is designed to carry out a method according to one of the preceding claims.
  10. Control module according to claim 9, characterised in that
    it is an ASIC.
  11. Operating unit for gas discharge lamps,
    having a control module according to claim 9 or 10.
  12. Operating unit for gas discharge lamps according to claim 11,
    characterised in that
    it is an electronic ballast for a fluorescent lamp or a high-pressure gas discharge lamp.
  13. Computer software programming product
    which implements a method according to one of claims 1 to 8 when it runs on a computing device.
EP20060754719 2005-07-28 2006-07-12 Adaptive regulation of the power of gas discharge lamps Not-in-force EP1908337B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005035466A DE102005035466A1 (en) 2005-07-28 2005-07-28 Adaptive regulation of the power of gas discharge lamps
PCT/EP2006/006824 WO2007012403A1 (en) 2005-07-28 2006-07-12 Adaptive regulation of the power of gas discharge lamps

Publications (3)

Publication Number Publication Date
EP1908337A1 EP1908337A1 (en) 2008-04-09
EP1908337B1 true EP1908337B1 (en) 2009-11-18
EP1908337B2 EP1908337B2 (en) 2015-05-06

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Application Number Title Priority Date Filing Date
EP20060754719 Not-in-force EP1908337B2 (en) 2005-07-28 2006-07-12 Adaptive regulation of the power of gas discharge lamps

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EP (1) EP1908337B2 (en)
AT (1) ATE449529T1 (en)
DE (2) DE102005035466A1 (en)
WO (1) WO2007012403A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009032028A1 (en) * 2009-07-07 2011-01-13 Tridonicatco Gmbh & Co. Kg Method for operating gas discharge lamps at low outside temperatures and equipment designed for this purpose
DE102010042020A1 (en) * 2010-10-06 2012-04-12 Osram Ag Circuit and method for controlling a lamp

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5382881A (en) * 1992-12-28 1995-01-17 North American Philips Corporation Ballast stabilization circuitry for eliminating moding or oscillation of the current envelope in gas discharge lamps and method of operating
US5623187A (en) * 1994-12-28 1997-04-22 Philips Electronics North America Corporation Controller for a gas discharge lamp with variable inverter frequency and with lamp power and bus voltage control
US5734232A (en) * 1995-11-07 1998-03-31 U.S. Philips Corporation Circuit arrangement
DE10225881A1 (en) * 2002-06-11 2004-01-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Discharge lamp operating circuit with circuit for detecting proximity to a capacitive operation
JP2005227748A (en) * 2004-01-14 2005-08-25 Sanyo Electric Co Ltd Projection type vido display device

Also Published As

Publication number Publication date
DE102005035466A1 (en) 2007-02-01
ATE449529T1 (en) 2009-12-15
EP1908337A1 (en) 2008-04-09
DE502006005415D1 (en) 2009-12-31
EP1908337B2 (en) 2015-05-06
WO2007012403A1 (en) 2007-02-01

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