EP0323992A1 - Power supply circuit for an electric discharge lamp - Google Patents

Power supply circuit for an electric discharge lamp

Info

Publication number
EP0323992A1
EP0323992A1 EP88905835A EP88905835A EP0323992A1 EP 0323992 A1 EP0323992 A1 EP 0323992A1 EP 88905835 A EP88905835 A EP 88905835A EP 88905835 A EP88905835 A EP 88905835A EP 0323992 A1 EP0323992 A1 EP 0323992A1
Authority
EP
European Patent Office
Prior art keywords
discharge lamp
lamp
power supply
choke
current limiting
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
EP88905835A
Other languages
German (de)
French (fr)
Other versions
EP0323992B1 (en
Inventor
Rudolf Mühling
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.)
Ultralight AG
Original Assignee
Ultralight AG
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 Ultralight AG filed Critical Ultralight AG
Priority to AT88905835T priority Critical patent/ATE75363T1/en
Publication of EP0323992A1 publication Critical patent/EP0323992A1/en
Application granted granted Critical
Publication of EP0323992B1 publication Critical patent/EP0323992B1/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
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/391—Controlling the intensity of light continuously using saturable magnetic devices

Definitions

  • the invention relates to a power supply circuit for a gas discharge lamp operated at an alternating current source according to the preamble of claim 1.
  • Power supply circuits of this type are generally known.
  • Gas discharge lamps show a non-linearity between the discharge current (lamp current) and the lamp voltage.
  • the lamp voltage is a characteristic of the lamp and is largely independent of the lamp current. This shows, however, that with lamps of low power, the voltage decreases somewhat with increasing current. This makes it necessary to use current limiting measures to protect the lamp against destruction.
  • the lamp voltage increases slightly with increasing lamp current. Small changes in the supply voltage therefore result in large changes in current, so that in this case current-limiting measures for stabilization are also necessary.
  • ballasts In the case of gas discharge lamps fed from the AC network, such current-limiting measures implemented in so-called ballasts generally consist essentially of a current-limiting inductor which is connected in series with the lamp and generates a voltage drop which should be approximately one third to half of the mains voltage. Since the lamp acts as an approximately ohmic load, this voltage drop is out of phase with the lamp voltage by approximately 90 °.
  • the light etro of a gas discharge lamp is to be adjustable, a variation in the supply voltage is of little use, because with an optimized lamp S circuit has only a very limited influence on the luminous flux.
  • the requirement that the instantaneous supply voltage must be greater than the lamp lamp voltage in order to avoid the lamp going out also sets limits for the controllability.
  • the control is therefore carried out in practice in the ballast itself. Continuously variable lamp current controls in the part-load range are implemented with the aid of leading edge circuits or with transducers.
  • the ballast must therefore be designed accordingly from the outset.
  • parallel or series connections of current limiting chokes are used, which allows regulation only in relatively coarse steps if the effort is not to be too great. It should be noted in particular with respect to phase gating controls that these generate a broad harmonic spectrum, which is undesirable for the lamp.
  • the invention has for its object to provide a Stromver ⁇ supply circuit of the type mentioned, with which the power consumption of a gas discharge lamp can be adjusted in a wide range, the limits of which are in a ratio of up to about 3: 1 to each other.
  • the invention thus extends the known power supply circuit by three additional components, namely a regulating transformer, a capacitor and an auxiliary choke, the auxiliary choke being able to be designed for a small power compared to the current limiting choke and the regulating transformer also being designed only for a corresponding Adequate power must be designed in accordance with the auxiliary circuit consisting of the auxiliary choke and the capacitor.
  • the regulating transformer can be of a commercial type which is adapted to the supply system voltage.
  • the in the auxiliary circuit i.e. Current flowing in the auxiliary branch is only dependent on the voltage on the auxiliary circuit, i.e. in the minimum position of the transformer tap from the lamp voltage and in the maximum position from the voltage across the current limiting choke. Depending on whether the lamp voltage or the voltage across the current limiting choke is greater, the current flowing in the auxiliary branch will also be greater or less in the minimum or maximum position. If the current and voltage nominal values of the auxiliary choke are reached, the auxiliary branch is optimally dimensioned. It is therefore not possible to choose arbitrary capacitance values; if they are too high, the auxiliary choke is overloaded. Their maximum value is determined by the size of the auxiliary choke.
  • the control range results from the apparent power in the auxiliary branch, which is the vector sum of the apparent powers of the capacitor and auxiliary choke.
  • the additional components mentioned can be added to an existing ballast of a gas discharge lamp without any components having to be exchanged in the ballast or line connections having to be opened. It is therefore possible to subsequently connect the control circuit embodied by the invention to the existing ballast using a simple plug connection, which in the borderline case is only three-pole (including four-pole including a ground connection conductor), or else to separate from this again without impairing its normal functionality.
  • step-up transformer which is often required at higher lamp voltages, can therefore be avoided under certain circumstances by using the invention.
  • a replacement for a step-up transformer consists only of the high-voltage choke and the capacitor of the auxiliary branch, as will be explained later.
  • Another advantage of the invention is that the sinusoidal character of the current flowing through the lamp is further improved, which is known to be gentle on the lamp.
  • the drawing shows a gas discharge lamp (Lp) 1, which is connected in series with a current limiting choke 2 to an AC power supply network, the poles of which are designated P and N. Between the current limiting choke 2 and the lamp 1, an ignition device (ZG) 3 can optionally be arranged in a known manner, which is connected via an ignition switch 4 to the other pole N of the power supply system.
  • the current limiting choke is usually under consideration dimensioning of the lamp voltage, the mains voltage and the lamp power, so that special explanations for this are unnecessary at this point.
  • a regulating transformer 5 In parallel with the inputs of the lamp circuit described above, which are connected to the poles P and N of the power network, a regulating transformer 5 is connected, which has a movable tap 6, to which a series circuit comprising a capacitor 7 and an auxiliary choke 8 is connected. The other end of this series connection is connected to the connection point 9 between the lamp 1 and the current limiting choke 2 (or, in the case of an intermediate igniter, between the choke 2 and the ignitor 3).
  • the capacitance and inductance of the capacitor 7 and the auxiliary choke 8 are matched to one another such that the reactance of the capacitor 7 is approximately 1.3 to 2.6 times as large as that of the auxiliary choke 8.
  • the ratio of these reactances to one another has a noticeable influence on the size of the control range that can be achieved with the control circuit embodied by the invention. This will be discussed later.
  • the auxiliary choke 8 is dimensioned such that its reactance is approximately 2 to 5 times that of the current limiting choke 2.
  • the smaller reactances require higher capacitor values in order to achieve comparable control ranges.
  • a so-called 400 watt current limiting choke with a reactance of about 44 ⁇ at 50 Hz mains frequency and a so-called 250 W auxiliary choke with a reactance of about 90Jl or, in a second series of tests, a reactance of about 225 S were carried out using capacitors of different sizes in the auxiliary branch measurements.
  • the mains voltage was 230 V in all cases.
  • the lamp voltage and the lamp current as well as the relative luminous flux were measured and the lamp power was calculated.
  • a measurement was carried out without a regulating transformer and without an auxiliary branch. The values obtained are plotted in the table below.
  • the lamp power can be varied by more than a factor of 2, the width of the range of variation being crucially dependent on the size of the capacitor 7 in relation to the reactance of the auxiliary choke 8.
  • the achievable variation range increases, whereby it is shown that in order to achieve the factor 2 mentioned, the reactance of the capacitor 7 should not exceed 1.5 times that of the auxiliary choke 8.
  • the device of the invention can also be used to compensate for fluctuations in the lamp power, which could be caused by external influences, or a decrease in the luminous flux, which is caused by lamp aging.
  • an electronic phase shifter can be used in the circuit. This is particularly advantageous when control speeds are required that cannot be achieved with an electromechanically adjustable control transformer. It is important that the phase shifter has a phase control range comparable to the control range of the control transformer within the circuit.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

PCT No. PCT/EP88/00652 Sec. 371 Date Mar. 9, 1989 Sec. 102(e) Date Mar. 9, 1989 PCT Filed Jul. 20, 1988 PCT Pub. No. WO89/00804 PCT Pub. Date Jan. 26, 1989.A power supply circuit for an electric discharge lamp driven by an A.C. power supply has a regulating transformer connected in parallel with a current limiting reactor and an electric discharge lamp interconnected in series. The tap of the regulating transformer is connected by a condenser and an auxiliary reactance interconnected in series to the connection between the current limiting reactor and the electric discharge lamp. By adjusting the tap of the regulating transformer the performance of the lamp can be influenced within a wide range. In place of the regulating transformer an electronic phase shifter may also be used, which is particularly advantageous when regulating speeds are required that cannot be achieved by means of an electromechanically adjustable regulating transformer.

Description

Stromversorgungsschaltung für eine Gasentladungslampe Power supply circuit for a gas discharge lamp
Beschreibungdescription
Die Erfindung bezieht sich auf eine Stromversorgungsschal¬ tung für eine an einer Wechselstromquelle betriebene Gasent¬ ladungslampe nach dem Oberbegriff des Anspruchs 1. Stromver¬ sorgungsschaltungen dieser Art sind allgemein bekannt.The invention relates to a power supply circuit for a gas discharge lamp operated at an alternating current source according to the preamble of claim 1. Power supply circuits of this type are generally known.
Gasentladungslampen zeigen eine Nichtlinearität zwischen dem Entladungsstrom (Lampenstrom) und der Lampenspannung. Die Lampenspannung ist eine der Lampe eigentümliche Größe und in einem weiten Bereich vom Lampenstrom unabhängig. Dabei zeigt sich jedoch, daß bei Lampen kleiner Leistung mit zunehmender Stromstärke die Spannung etwas abnimmt. Dies macht den Einsatz von Strombegrenzungsmaßnahmen zum Schutz der Lampe gegen Zerstörung notwendig. Bei Lampen großer Leistung nimmt die Lampenspannung mit steigendem Lampenstrom geringfügig zu. Kleine Änderungen der Versor¬ gungsspannung haben daher große Stromänderungen zur Folge, sodaß in diesem Falle strombegrenzende Maßnahmen zur Stabili sierung ebenfalls notwendig sind.Gas discharge lamps show a non-linearity between the discharge current (lamp current) and the lamp voltage. The lamp voltage is a characteristic of the lamp and is largely independent of the lamp current. This shows, however, that with lamps of low power, the voltage decreases somewhat with increasing current. This makes it necessary to use current limiting measures to protect the lamp against destruction. In the case of lamps of high power, the lamp voltage increases slightly with increasing lamp current. Small changes in the supply voltage therefore result in large changes in current, so that in this case current-limiting measures for stabilization are also necessary.
Solche strombegrenzenden, in sogenannten Vorschaltgeräten realisierten Maßnahmen bestehen bei aus dem Wechselstrom¬ netz gespeisten Gasentladungslampen zumeist im wesentlichen aus einer Strombegrenzungsdrossel, die in Serie mit der Lampe geschaltet ist und einen Spannungsabfall erzeugt, der etwa ein Drittel bis zu Hälfte der Netzspannung betragen sollte. Da die Lampe als annähernd ohm'sche Last wirkt, ist dieser Spannungsabfall gegenüber der Lampenspannung um etwa 90° phasenverschoben.In the case of gas discharge lamps fed from the AC network, such current-limiting measures implemented in so-called ballasts generally consist essentially of a current-limiting inductor which is connected in series with the lamp and generates a voltage drop which should be approximately one third to half of the mains voltage. Since the lamp acts as an approximately ohmic load, this voltage drop is out of phase with the lamp voltage by approximately 90 °.
Wenn der Lichtetro einer Gasentladungslampe einstellbar sein soll, kommt hierfür eine Variation der Versorgungs¬ spannung nur wenig in Betracht, weil bei optimiertem Lampen- Stromkreis diese nur einen sehr begrenzten Einfluß auf den Lichtstrom hat. Auch setzt die Forderung, daß die Momentan- Versorgungsspannung größer als die Lampenbrennspannung sein muß, um ein Erlöschen der Lampe zu vermeiden, Grenzen für die Regelbarkeit. Die Regelung wird daher in der Praxis im Vorschaltgerät selbst vorgenommen. Stufenlosc Lampen- stromregelungen im Teillastbereich werden mit Hilfe von Phasenanschnittschaltungen oder mit Transduktoren reali¬ siert, das Vorschaltgerät muß daher von vornherein ent¬ sprechend gestaltet sein. Im Hochlastbereich greift man zu Parallel- oder Serienschaltungen von Strombegrenzungs¬ drosseln, was eine Regelung nur in relativ groben Stufen ermöglicht, wenn der Aufwand nicht zu groß werden soll. Speziell zu Phasenanschnittsteuerungen sei angemerkt, daß diese ein breites Oberwellenspektrum erzeugen, was für die Lampe unerwünscht ist.If the light etro of a gas discharge lamp is to be adjustable, a variation in the supply voltage is of little use, because with an optimized lamp S circuit has only a very limited influence on the luminous flux. The requirement that the instantaneous supply voltage must be greater than the lamp lamp voltage in order to avoid the lamp going out also sets limits for the controllability. The control is therefore carried out in practice in the ballast itself. Continuously variable lamp current controls in the part-load range are implemented with the aid of leading edge circuits or with transducers. The ballast must therefore be designed accordingly from the outset. In the high-load range, parallel or series connections of current limiting chokes are used, which allows regulation only in relatively coarse steps if the effort is not to be too great. It should be noted in particular with respect to phase gating controls that these generate a broad harmonic spectrum, which is undesirable for the lamp.
Der Erfindung liegt die Aufgabe zugrunde, eine Stromver¬ sorgungsschaltung der eingangs genannten Art anzugeben, mit welchem die Leistungsaufnahme einer Gasentladungslampe in einem weiten Bereich, dessen Grenzen in einem Verhältnis bis zu etwa 3 : 1 zueinander stehen, eingestellt werden kann.The invention has for its object to provide a Stromver¬ supply circuit of the type mentioned, with which the power consumption of a gas discharge lamp can be adjusted in a wide range, the limits of which are in a ratio of up to about 3: 1 to each other.
Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Er¬ findung sind Gegenstand der Unteransprüche.This object is achieved by the characterizing features of claim 1. Advantageous embodiments of the invention are the subject of the subclaims.
Die Erfindung erweitert die bekannte Stromversorgungs¬ schaltung somit um drei zusätzliche Bauelemente, nämlich einen Regeltransformator, einen Kondensator und eine Hilfs¬ drossel, wobei die Hilfsdrossel für eine im Vergleich zur Strombegrenzungsdrossel kleine Leistung ausgelegt werden kann und auch der Regeltransformator nur für eine entspre- chend kleine Leistung ausgelegt zu sein braucht entsprechend dem aus der Hilfsdrossel und dem Kondensator bestehenden Hilfsstromkreis. Der Regeltransformator kann von handels¬ üblicher Bauart sein, der an die Versorgungsnetzspannung angepaßt ist.The invention thus extends the known power supply circuit by three additional components, namely a regulating transformer, a capacitor and an auxiliary choke, the auxiliary choke being able to be designed for a small power compared to the current limiting choke and the regulating transformer also being designed only for a corresponding Adequate power must be designed in accordance with the auxiliary circuit consisting of the auxiliary choke and the capacitor. The regulating transformer can be of a commercial type which is adapted to the supply system voltage.
Der im Hilf stromkreis, d.h. im Hilfszweig fließende Strom ist nur abhängig von der Spannung am Hilfsstromkreis, d.h. in der Minimumstellung des Transformatorabgriffs von der Lampenspanπung und in der Maximumstellung von der Spannung über der Strombegrenzungsdrossel. Je nachdem, ob die Lampen¬ spannung oder die Spannung über der Strombegrenzungsdrossel größer ist, wird auch der im Hilfszweig fließende Strom in der Minimum- oder Maximumstellung größer oder kleiner sein. Werden die Strom- und Spannungsnennwerte der Hilfsdrossel erreicht, ist der Hilfszweig optimal dimensioniert. Man kann daher nicht beliebige Kapazitätswerte wählen; sind sie zu hoch, wird die Hilfsdrossel überlastet. Ihr Maximalwert ist durch die Größe der Hilfsdrossel bestimmt.The in the auxiliary circuit, i.e. Current flowing in the auxiliary branch is only dependent on the voltage on the auxiliary circuit, i.e. in the minimum position of the transformer tap from the lamp voltage and in the maximum position from the voltage across the current limiting choke. Depending on whether the lamp voltage or the voltage across the current limiting choke is greater, the current flowing in the auxiliary branch will also be greater or less in the minimum or maximum position. If the current and voltage nominal values of the auxiliary choke are reached, the auxiliary branch is optimally dimensioned. It is therefore not possible to choose arbitrary capacitance values; if they are too high, the auxiliary choke is overloaded. Their maximum value is determined by the size of the auxiliary choke.
Der Regelbereich ergibt sich aus der Scheinleistung im Hilfszweig, die durch die Vektorsumme der Scheinleistungen von Kondensator und Hilfsdrossel ist.The control range results from the apparent power in the auxiliary branch, which is the vector sum of the apparent powers of the capacitor and auxiliary choke.
Es ist ein besonderer Vorteil der Erfindung, daß die genann¬ ten zusätzlichen Bauelemente zu einem bestehenden Vorschalt¬ gerät einer Gasentladungslampe nachträglich hinzugefügt werden können, ohne daß in dem Vorschaltgerät irgendwelche Bauelemente auszutauschen wären oder Leitungsverbindungen geöffnet werden müßten. Es ist daher möglich, die von der Erfindung verkörperte Regelschaltung mit einer einfachen, im Grenzfall nur dreipoligen (unter Einschluß eines Masse¬ verbindungsleiters vierpoligen) Steckverbindung nachträglich an das bestehende Vorschaltgerät anzuschließen oder auch von diesem wieder zu trennen, ohne dessen übliche Funktions¬ tüchtigkeit zu beeinträchtigen.It is a particular advantage of the invention that the additional components mentioned can be added to an existing ballast of a gas discharge lamp without any components having to be exchanged in the ballast or line connections having to be opened. It is therefore possible to subsequently connect the control circuit embodied by the invention to the existing ballast using a simple plug connection, which in the borderline case is only three-pole (including four-pole including a ground connection conductor), or else to separate from this again without impairing its normal functionality.
Da in der "Maximum"-Stellung des Abgriffs am Regeltrans¬ formator an der Lampe eine Spannung wirksam ist, die höher als die übliche, von der Strombegrenzungsdrossel abgege¬ bene Spannung ist, wird in vorteilhafter Weise die Gesamt¬ anordnung zündwilliger-. Ein sogenannter Step-up-Transfor- mator, der bei höheren Lampenspannungen häufig erforderlich ist, läßt sich durch den Einsatz der Erfindung daher unter Umständen vermeiden. Im Grenzfall, wenn auf eine Regelung der Lampenleistung verzichtet werden kann, besteht ein solcher Ersatz für einen Step-up-Transformator nur aus der Hi fsdrossel und dem Kondensator des Hilfszweiges, wie später noch erläutert wird.Since in the "maximum" position of the tap on the control transformer on the lamp a voltage is effective which is higher than the usual voltage emitted by the current limiting choke, the overall arrangement advantageously becomes more readily ignitable. A so-called step-up transformer, which is often required at higher lamp voltages, can therefore be avoided under certain circumstances by using the invention. In the limit, when there is no need to regulate the lamp power, such a replacement for a step-up transformer consists only of the high-voltage choke and the capacitor of the auxiliary branch, as will be explained later.
Ein weiterer Vorteil der Erfindung besteht darin, daß der Sinuscharakter des durch die Lampe fließenden Stroms noch verbessert wird, was bekanntermaßen lampenschonend ist.Another advantage of the invention is that the sinusoidal character of the current flowing through the lamp is further improved, which is known to be gentle on the lamp.
Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung näher erläutert.The invention is explained in more detail below with reference to the drawing.
Die Zeichnung zeigt eine Gasentladungslampe (Lp) 1, die mit einer Strombegrenzungsdrossel 2 in Serie an ein Wechsel¬ stromversorgungsnetz angeschaltet ist, dessen Pole mit P und N bezeichnet sind. Zwischen der Strombegrenzungsdrossel 2 und der Lampe 1 kann ggf. in bekannter Weise ein Zünd¬ gerät (ZG) 3 angeordnet sein, das über einen Zündschalter 4 mit dem anderen Pol N des Stromnetzes verbunden ist. Die Strombegrenzungsdrossel ist üblicherweise unter Berück- sichtigung der Lampenspannung, der Netzspannung und der Lampenleistung dimensioniert, sodaß sich spezielle Ausfüh¬ rungen hierzu an dieser Stelle erübrigen.The drawing shows a gas discharge lamp (Lp) 1, which is connected in series with a current limiting choke 2 to an AC power supply network, the poles of which are designated P and N. Between the current limiting choke 2 and the lamp 1, an ignition device (ZG) 3 can optionally be arranged in a known manner, which is connected via an ignition switch 4 to the other pole N of the power supply system. The current limiting choke is usually under consideration dimensioning of the lamp voltage, the mains voltage and the lamp power, so that special explanations for this are unnecessary at this point.
Parallel mit den Eingängen der vorbeschriebenen Lampenschal¬ tung, die mit den Polen P und N des Stromnetzes verbunden sind, ist ein Regeltransformator 5 verbunden, der einen beweglichen Abgriff 6 hat, an den eine Reihenschaltung aus einem Kondensator 7 und einer Hilfsdrossel 8 angeschaltet ist. Das andere Ende dieser Reihenschaltung ist mit dem Ver¬ bindungspunkt 9 zwischen Lampe 1 und Strombegrenzungsdrossel 2 (bzw. bei zwischengeschaltetem Zündgerät zwischen Drossel 2 und Zündgerät 3) verbunden.In parallel with the inputs of the lamp circuit described above, which are connected to the poles P and N of the power network, a regulating transformer 5 is connected, which has a movable tap 6, to which a series circuit comprising a capacitor 7 and an auxiliary choke 8 is connected. The other end of this series connection is connected to the connection point 9 between the lamp 1 and the current limiting choke 2 (or, in the case of an intermediate igniter, between the choke 2 and the ignitor 3).
Die Kapazität und die Induktivität von Kondensator 7 und Hilfsdrossel 8 sind aufeinander so abgestimmt, daß die Reaktanz des Kondensators 7 etwa 1,3 bis 2,6 mal so groß ist, wie die der Hilfsdrossel 8. Das Verhältnis dieser Reaktanzen zueinander hat einen merklichen Einfluß auf die Größe des Regelbereiches, der mit der durch die Erfindung verkörperten Regelschaltung erzielbar ist. Hierauf wird später noch eingegangen.The capacitance and inductance of the capacitor 7 and the auxiliary choke 8 are matched to one another such that the reactance of the capacitor 7 is approximately 1.3 to 2.6 times as large as that of the auxiliary choke 8. The ratio of these reactances to one another has a noticeable influence on the size of the control range that can be achieved with the control circuit embodied by the invention. This will be discussed later.
In Bezug auf die Strombegrenzungsdrossel 2 ist die Hilfs¬ drossel 8 derart dimensioniert, daß ihre Reaktanz etwa das 2- bis 5-fache von der der Strombegrenzungsdrossel 2 beträgt. Die kleineren Reaktanzen erfordern höhere Kondensatorwerte, um vergleichbare Regelbereichsbreiten zu erzielen.With regard to the current limiting choke 2, the auxiliary choke 8 is dimensioned such that its reactance is approximately 2 to 5 times that of the current limiting choke 2. The smaller reactances require higher capacitor values in order to achieve comparable control ranges.
Nachfolgend werden mit der Erfindung erzielte Versuchser¬ gebnisse tabellarisch zusammengefaßt.Test results achieved with the invention are summarized below in tabular form.
Mit einer Quecksilberdampf-Hochdrucklampe einer Leistung von 400 W, einer sogenannten 400-Watt-Strombegrenzungs- drossel einer Reaktanz von etwa 44Λ bei 50 Hz Netzfrequenz und einer sogenannten 250 W Hilfsdrossel einer Reaktanz von etwo 90Jl bzw., in einer zweiten Versuchsreihe, einer Reaktanz von etwa 225 S , wurden unter Verwendung von Kondensatoren unterschiedlicher Größen im Hilfszweig Messun¬ gen ausgeführt. Die Netzspannung betrug in allen Fällen 230 V. Es wurden dabei jeweils in der Minimumstellung und in der Maximumstellung des Abgriffs 6 am Regeltransformator 5 u.a. die Lampenspannung und der Lampenstrom sowie der relative Lichtstrom gemessen und die Lampenleistung errechnet. Im Vergleich dazu wurde eine Messung ohne Regeltransformator und ohne Hilfszweig durchgeführt. Die erhaltenen Werte sind in der nachfolgenden Tabelle aufgetragen.With a high pressure mercury vapor lamp with a power of 400 W, a so-called 400 watt current limiting choke with a reactance of about 44Λ at 50 Hz mains frequency and a so-called 250 W auxiliary choke with a reactance of about 90Jl or, in a second series of tests, a reactance of about 225 S, were carried out using capacitors of different sizes in the auxiliary branch measurements. The mains voltage was 230 V in all cases. In the minimum position and in the maximum position of the tap 6 on the regulating transformer 5, the lamp voltage and the lamp current as well as the relative luminous flux were measured and the lamp power was calculated. In comparison, a measurement was carried out without a regulating transformer and without an auxiliary branch. The values obtained are plotted in the table below.
ohne 120 4,12 494 42 In dieser Tabelle bedeuten: without 120 4.12 494 42 In this table:
U, = Spannung an der Lampe 1, I, = Lampenstrom N. = errechnete LampenleistungU, = voltage at lamp 1, I, = lamp current N. = calculated lamp power
E = relativer Lichtstrom in Skalenteilen (Skt) einer linearen SkalaE = relative luminous flux in scale parts (Skt) of a linear scale
Man kann aus der Tabelle entnehmen, daß die Lampenleistung um mehr als den Faktor 2 variierbar ist, wobei die Breite des Variationsbereiches maßgeblich von der Größe des Konden¬ sators 7 im Verhältnis zur Reaktanz der Hilfsdrossel 8 ab¬ hängt. Mit wachsender Kapazität nimmt der erzielbare Varia¬ tionsbereich zu, wobei sich zeigt, daß zur Erzielung des genannten Faktors 2 die Reaktanz des Kondensators 7 das 1,5-fache von der der Hilfsdrossel 8 nicht überschreiten sol lte.It can be seen from the table that the lamp power can be varied by more than a factor of 2, the width of the range of variation being crucially dependent on the size of the capacitor 7 in relation to the reactance of the auxiliary choke 8. With increasing capacitance, the achievable variation range increases, whereby it is shown that in order to achieve the factor 2 mentioned, the reactance of the capacitor 7 should not exceed 1.5 times that of the auxiliary choke 8.
Man erkennt aus der Tabelle auch, daß in Maximum-Stellung des Abgriffs am Regeltransformator, in welcher der Abgriff auf dem Potential des N-Poles des Stromnetzes liegt und der Regeltransformator daher für den Hilfszweig unwirksam ist, in allen Fällen eine höhere Lampenleistung als bei Verzicht auf die von der Erfindung verkörperte RegelSchaltung er¬ reicht wird, wie das Vergleichsbeispiel am Ende der Tabelle zeigt. Wenn auf den Regeltransformator und somit auf die Regelbarkeit der Lampenleistung verzichtet wird, ist es daher mit Hilfe des dann verbliebenen Teilmerkmals der Er¬ findung, nämlich der Serienschaltung aus Kondensator und Hilfsdrossel im Hilfszweig, noch immer möglich, eine Steige¬ rung der Lampenleistung ohne Verwendung eines Step-up-Trans- formators bzw. ohne Änderung an der Strombegrenzungsdrossel zu erzielen.It can also be seen from the table that in the maximum position of the tap on the control transformer, in which the tap is at the potential of the N pole of the power supply system and the control transformer is therefore ineffective for the auxiliary branch, in all cases a higher lamp power than when it is dispensed with to the control circuit embodied by the invention is achieved, as the comparative example at the end of the table shows. If the regulating transformer and thus the controllability of the lamp power are dispensed with, it is therefore still possible with the help of the then remaining partial feature of the invention, namely the series connection of capacitor and auxiliary choke in the auxiliary branch, an increase in the lamp power without use of a step-up transformer or without changing the current limiting choke.
Es versteht sich, daß unter Zuhilfenahme einer Servoeinrich- 8 -It goes without saying that with the help of a servo device 8th -
tung der Erfindung ay h dazu verwendet werden kann, Schwan¬ kungen der Lampenleistung, die durch äußere Einflüsse hervorgerufen werden könnten, oder einen Lichtstromrückgang, der durch Lampenalterung bedingt ist, ausgeregelt werden können.device of the invention can also be used to compensate for fluctuations in the lamp power, which could be caused by external influences, or a decrease in the luminous flux, which is caused by lamp aging.
Anstelle eines Regeltransformators kann in der Schaltung ein elektronischer Phasenschieber verwendet werden. Ein solcher ist besonders dann vorteilhaft, wenn Regelgeschwin¬ digkeiten gefordert werden, die sich mit einem elektrome¬ chanisch nachstellbaren Regeltransformator nicht erzielen lassen. Wichtig ist, daß der Phasenschieber einen dem Regelbereich des Regeltransformators innerhalb der Schaltung vergleichbaren Phasenregelbereich aufweist. Instead of a regulating transformer, an electronic phase shifter can be used in the circuit. This is particularly advantageous when control speeds are required that cannot be achieved with an electromechanically adjustable control transformer. It is important that the phase shifter has a phase control range comparable to the control range of the control transformer within the circuit.

Claims

Stromversorgungsschaltung für eine GasentladungslampePatentansprüche Power supply circuit for a gas discharge lamp
1. Stromversorgungsschaltung für eine an einer Wechselstrom¬ quelle betriebenen Gasentladungslampe, enthaltend eine Strom¬ begrenzungsdrossel, deren eines (erstes) Ende mit dem einen (ersten) Anschluß der Gasentladungslampe verbunden ist, während ihr anderes (zweites) Ende und der andere (zweite) Anschluß der Gasentladungslampe zur Verbindung mit den Polen der Wechselstromquelle bestimmt sind, d a d u r c h geken n ¬ z e i c n et , daß der Serienschaltung aus Strombegrenzungs¬ drossel (2) und Gasentladungslampe (1) ein Regeltransformator (5) parallelgeschaltet ist, dessen Abgriff (6) über eine Reihenschaltung aus einem Kondensator (7) und einer Hilfs¬ drossel (8) mit dem Verbindungspunkt (9) von Strombegren¬ zungsdrossel (2) und Gasentladungslampe (1) verbunden ist und daß die Reaktanz des Kondensators (7) etwa das 1,3- bis 2,5-fache der Reaktanz der Hilfsdrossel (8) beträgt.1. Power supply circuit for a gas discharge lamp operated at an alternating current source, comprising a current limiting choke, one (first) end of which is connected to one (first) connection of the gas discharge lamp, while the other (second) end and the other (second) Connection of the gas discharge lamp for connection to the poles of the alternating current source are determined, characterized in that the series circuit comprising current limiting choke (2) and gas discharge lamp (1) is connected in parallel with a regulating transformer (5) whose tap (6) is connected via a Series connection of a capacitor (7) and an auxiliary choke (8) is connected to the connection point (9) of the current limiting choke (2) and gas discharge lamp (1) and that the reactance of the capacitor (7) is approximately 1.3- is up to 2.5 times the reactance of the auxiliary choke (8).
2. Stromversorgungsschaltung nach Anspruch 1, d a d u rc h g e k en n z e i c h n et , daß die Reaktanz der Hilfsdrossel (8) etwa 1,5 bis 5 mal so groß wie die Reaktanz der Strombegren¬ zungsdrossel (2) ist. 2. Power supply circuit according to claim 1, dadu rc hgek en nzeichn et that the reactance of the auxiliary choke (8) is about 1.5 to 5 times as large as the reactance of the current limiting throttle (2).
3. Stromversorgungsschaltung nach Anspruch 1, d adurch gekennze i chnet , daß der Abgriff (6) des Regeltrans¬ formators (5) zwischen Maximal- und Minimalstellungen ver¬ stellbar ist, in denen er sich auf dem Potential des zweiten Anschlusses (N) der Gasentladungslampe (1) bzw. auf dem Potential des zweiten Anschlusses (P) der Strombegrenzungs¬ drossel (2) befindet.3. Power supply circuit according to claim 1, characterized by the fact that the tap (6) of the regulating transformer (5) is adjustable between maximum and minimum positions, in which it is at the potential of the second terminal (N) Gas discharge lamp (1) or at the potential of the second connection (P) of the current limiting choke (2).
4. Stromversorgungsschaltung nach einem der vorhergehenden Ansprüche, dadurch gekennzei chnet , daß als ein¬ stellbares Glied anstelle des Regeltransformators (5) ein elektronischer Phasenschieber mit vergleichbarem Regel¬ bereich vorgesehen ist. 4. Power supply circuit according to one of the preceding claims, characterized in that an electronic phase shifter with a comparable control range is provided as an adjustable member instead of the control transformer (5).
EP88905835A 1987-07-20 1988-07-20 Power supply circuit for an electric discharge lamp Expired - Lifetime EP0323992B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88905835T ATE75363T1 (en) 1987-07-20 1988-07-20 POWER SUPPLY CIRCUIT FOR A GAS DISCHARGE LAMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3723971 1987-07-20
DE19873723971 DE3723971A1 (en) 1987-07-20 1987-07-20 POWER SUPPLY CIRCUIT FOR A GAS DISCHARGE LAMP

Publications (2)

Publication Number Publication Date
EP0323992A1 true EP0323992A1 (en) 1989-07-19
EP0323992B1 EP0323992B1 (en) 1992-04-22

Family

ID=6331962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88905835A Expired - Lifetime EP0323992B1 (en) 1987-07-20 1988-07-20 Power supply circuit for an electric discharge lamp

Country Status (6)

Country Link
US (1) US5015922A (en)
EP (1) EP0323992B1 (en)
JP (1) JPH02500147A (en)
AT (1) ATE75363T1 (en)
DE (2) DE3723971A1 (en)
WO (1) WO1989000804A1 (en)

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US5239239A (en) * 1992-03-26 1993-08-24 Stocker & Yale, Inc. Surrounding a portion of a lamp with light regulation apparatus
US11087913B2 (en) 2017-05-15 2021-08-10 General Electric Company Transformer system

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AU644388B2 (en) * 1989-10-05 1993-12-09 United States of America, as represented by the Secretary, U.S. Department of Commerce, The Diagnostic kit and diagnostic method utilizing carbohydrate receptors

Also Published As

Publication number Publication date
WO1989000804A1 (en) 1989-01-26
ATE75363T1 (en) 1992-05-15
JPH02500147A (en) 1990-01-18
EP0323992B1 (en) 1992-04-22
DE3723971A1 (en) 1989-02-02
US5015922A (en) 1991-05-14
DE3870432D1 (en) 1992-05-27

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