EP0111956B1 - Disposition de circuit pour mettre en marche des lampes à décharge à haute pression - Google Patents

Disposition de circuit pour mettre en marche des lampes à décharge à haute pression Download PDF

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Publication number
EP0111956B1
EP0111956B1 EP83201696A EP83201696A EP0111956B1 EP 0111956 B1 EP0111956 B1 EP 0111956B1 EP 83201696 A EP83201696 A EP 83201696A EP 83201696 A EP83201696 A EP 83201696A EP 0111956 B1 EP0111956 B1 EP 0111956B1
Authority
EP
European Patent Office
Prior art keywords
lamp
capacitor
circuit arrangement
current
diode
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.)
Expired
Application number
EP83201696A
Other languages
German (de)
English (en)
Other versions
EP0111956A1 (fr
Inventor
Hans Günter Ganser
Hans-Peter Dr. Stormberg
Ralf Dr. Schäfer
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Priority to AT83201696T priority Critical patent/ATE23246T1/de
Publication of EP0111956A1 publication Critical patent/EP0111956A1/fr
Application granted granted Critical
Publication of EP0111956B1 publication Critical patent/EP0111956B1/fr
Expired 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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/231—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for high-pressure lamps

Definitions

  • the invention relates to a circuit arrangement for operating high-pressure gas discharge lamps with pulsating direct current, consisting of a full-wave rectifier connected to an AC voltage network, the direct voltage of which is supplied to the discharge lamp via a current limiter connected in series with it, the output of the full-wave rectifier being connected in series by a diode and a capacitor is bridged, which at least partially discharges via the lamp after every half cycle of the mains AC voltage.
  • a problem with the operation of high pressure gas discharge lamps is the initial ignition of the lamps, i.e. the starting of the cold lamps and the re-ignition after each zero crossing of the mains alternating current or every direct current pulse.
  • high re-ignition voltages e.g., during the warm-up phase, which, depending on the lamp size, takes between 30 seconds and 5 minutes after the initial ignition, 500 to 1000V, it may be necessary that these can no longer be supplied by the voltage source and therefore the lamp goes out.
  • Almost all components of the circuit arrangement e.g. Switching transistors and capacitors can be designed for this voltage.
  • the re-ignition of the lamps is improved in that the capacitor changes after every half cycle of the AC mains voltage, ie in the vicinity of the zero crossings of the AC mains voltage, discharged at least partially via the lamp via a thyristor.
  • a high voltage of approximately 200 to 300 V is required across this capacitor for a time of approximately 1 msec before and after the zero crossing of the AC voltage in order to avoid reignition difficulties.
  • this capacitor has a capacitance of 2.2 I IF.
  • Such a capacitor is relatively large in space and would be difficult to insert into a circuit arrangement which, for example, should be able to be integrated into the lamp itself, for example into the lamp base.
  • the invention has for its object to provide a circuit arrangement for operating high-pressure gas discharge lamps, which enables a low re-ignition voltage during the warm-up phase of the lamp and manages with relatively small components.
  • This object is achieved in a circuit arrangement of the type mentioned at the outset according to the invention in that the capacitor has a value of 10 nF to 1 Il F and in that a high-resistance resistor with respect to the current limiter is connected in the circuit between the diode-side end of this capacitor and the lamp .
  • the invention is based on the knowledge that, in order to avoid reignition difficulties, it is sufficient if a very small current flows in the discharge circuit between the capacitor and the lamp, which current is between 1 and 30 mA, depending on the lamp size. This is achieved by limiting the current through the lamp through the high resistance. At the same time, a substantial discharge of the now relatively small capacitor is avoided.
  • the current limiter can be an ohmic resistor which is connected in series with a further diode.
  • the high-resistance resistor is advantageously connected to the lamp via a switching transistor, which leads to a reduction in the power loss in the high-resistance resistor.
  • the current limiter can also be an electronic ballast, e.g. a chopper or a flyback converter.
  • a further diode is connected in series to the electronic ballast and the lamp-side end of the high-resistance resistor is connected between this further diode and the ballast.
  • a switching transistor usually connected in series with the lamp is conductive in the vicinity of the zero crossings of the AC line voltage, so that a current can then flow from the capacitor to the lamp via the high-resistance resistor.
  • a and B designate input terminals for connection to an AC voltage network of 220 V, 50 Hz.
  • a full-wave rectifier 1 with four diodes, which generates a pulsating direct current, is connected to these input terminals, possibly via a line filter.
  • a high-pressure gas discharge lamp 3, in particular a metal halide discharge lamp, is connected in series with a current limiter 2 to the output of the full-wave rectifier 1.
  • the current limiter 2 is an electronic ballast, such as it is described for example in US-A 3890537.
  • the output of the full-wave rectifier 1 is also bridged by a series connection of a diode 4 and a capacitor 5. Between the diode-side end of the capacitor 5 and the lamp 3, a high-resistance resistor 6 is connected to the current limiter 2.
  • the lamp 3 After the lamp 3 has been ignited for the first time, it is in a warm-up phase which, depending on the lamp size, takes between about 30 seconds and 5 minutes. During this warm-up phase, relatively high re-ignition voltages are required after each mains AC voltage zero crossing so that the lamp does not go out. However, these high re-ignition voltages cannot normally be supplied by the electronic ballast 2 during the zero crossing of the AC mains voltage. Rather, the capacitor 5 is provided for this purpose, which charges during the peaks of the mains AC voltage periods and at least partially discharges via the lamp 3 in the vicinity of the zero crossings of the mains AC voltage. If the capacitor 5 were connected directly to the lamp 3, discharge currents of more than 100 mA would flow, which would require a very large capacitor.
  • the high-impedance resistor 6 reduces these currents from the capacitor 5 to 1 to 30 mA, depending on the lamp size. Surprisingly, it has been found that, compared to the mean lamp current, this very small discharge current during the zero crossings of the AC mains voltage is sufficient to re-ignite the lamp 3 with a relatively low voltage during its warm-up phase.
  • the capacitor 5 need only have a capacitance of 10 nF to 1 I IF. In a practical exemplary embodiment with a 45 W metal halide discharge lamp, the capacitor 5 had a capacitance of 200 nF and the resistor 6 had a value of 300 kOhm.
  • the capacitor 5 is charged via the diode 4 to the peak value of the AC line voltage (about 300V).
  • a current of approximately 1 mA flows from the capacitor 5 via the resistor 6 through the lamp 3; in this case the capacitor 5 is not completely discharged.
  • 45 W metal halide lamps go through their warm-up phase without reignition problems.
  • a further diode 7 is connected upstream of the electronic ballast 2 and the lamp-side end of the high-resistance resistor 6 is connected between this further diode 7 and the ballast 2.
  • the high-resistance resistor 6 contributes to reducing the discharge current from the capacitor 5 via the ballast 2 through the lamp 3 during the zero crossings of the AC mains voltage.
  • the further diode 7 prevents a reverse current from the capacitor 5 to the full-wave rectifier 1.
  • the electronic ballast 2 is, for example, a forward converter, its switching transistor is turned on near the zero crossings of the AC line voltage, so that during this time a current can flow from the capacitor 5 via the high-resistance resistor 6 directly to the lamp 3. Outside the zero crossings of the AC line voltage, the switching transistor of the electronic ballast 2 usually only works with a pulse duty factor of about 30%, so that the current from the capacitor 5 via the high-resistance resistor 6 is also interrupted with this pulse duty factor.
  • the power loss in the high-resistance resistor 6 is reduced to 30%, which, however, has no disadvantages for the ignition behavior of the lamp 3, since the additional current from the capacitor 5 only has to flow through the lamp 3 in the vicinity of the zero crossings of the AC mains voltage.
  • the circuit arrangement according to FIG. 1 has an ohmic resistor 12 of approximately 250 ohms, which is connected in series with a further diode 7 to avoid reverse currents.
  • the high-resistance resistor 6 is connected to the lamp 3 via a switching transistor 8.
  • This switching transistor 8 is switched on and off via a control circuit 9.
  • the control circuit 9 is regulated by the rectified mains voltage. If the instantaneous value of this rectified mains voltage falls short of a value of z. B. 50 V, the switching transistor 8 is turned on so that an additional current can flow from the capacitor 5 through the high-resistance resistor 6 through the lamp.
  • the switching transistor 8 is switched non-conductive by the control circuit 9 and thus the current through the high-resistance resistor 6 is interrupted. Power losses in the high-resistance resistor 6 thus only occur during approximately 10% of the mains AC voltage period. In this circuit for a 45 W metal halide discharge lamp, the power loss in the high-resistance resistor 6 is usually below 0.1 W.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (5)

1. Dispositif de circuit pour le fonctionnement de lampes à décharge dans le gaz à haute pression avec du courant continu pulsé, constitué par un redresseur biphasé connecté au réseau de tension alternative, la tension continue du redresseur étant amenée à la lampe à décharge par l'intermédiaire d'un limiteur de courant monté avec cette dernière en série et la sortie du redresseur biphasé étant shuntée par un montage en série d'une diode et d'un condensateur, qui se décharge après chaque alternance de la tension alternative du réseau au moins partiellement par l'intermédiaire de la lampe, caractérisé en ce que le condensateur présente une valeur de 10 nF à 1 IlF et une résistance à valeur ohmique élevée par rapport au limiteur de courant est monté dans le circuit de courant entre l'extrémité du côté de la diode de ce condensateur et la lampe.
2. Dispositif de circuit selon la revendication 1, caractérisé en ce que le limiteur de courant est une résistance ohmique 12 qui est montée en série avec une autre diode 7.
3. Dispositif de circuit selon la revendication 1, caractérisé en ce que le limiteur de courant est un ballast électronique 2.
4. Dispositif de circuit selon l'une des revendications 1 ou 3, caractérisé en ce que la résistance de valeur ohmique élevée (6) est connectée à la lampe (3) par l'intermédiaire d'un transistor de commutation (8).
5. Dispositif de circuit selon la revendication 3, caractérisé en ce qu'une autre diode (7) est montée en série avec le ballast électronique (2) et que l'extrémité du côté de la lampe de la résistance à valeur ohmique élevée (6) est connectée entre cette autre diode et le ballast.
EP83201696A 1982-12-11 1983-12-01 Disposition de circuit pour mettre en marche des lampes à décharge à haute pression Expired EP0111956B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83201696T ATE23246T1 (de) 1982-12-11 1983-12-01 Schaltungsanordnung zum betrieb von hochdruckgasentladungslampen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3245924 1982-12-11
DE19823245924 DE3245924A1 (de) 1982-12-11 1982-12-11 Schaltungsanordnung zum betrieb von hochdruck-gasentladungslampen

Publications (2)

Publication Number Publication Date
EP0111956A1 EP0111956A1 (fr) 1984-06-27
EP0111956B1 true EP0111956B1 (fr) 1986-10-29

Family

ID=6180442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201696A Expired EP0111956B1 (fr) 1982-12-11 1983-12-01 Disposition de circuit pour mettre en marche des lampes à décharge à haute pression

Country Status (6)

Country Link
US (1) US4816721A (fr)
EP (1) EP0111956B1 (fr)
JP (1) JPS59117095A (fr)
AT (1) ATE23246T1 (fr)
CA (1) CA1229128A (fr)
DE (2) DE3245924A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3517248A1 (de) * 1985-05-13 1986-11-13 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zum betrieb von gasentladungslampen mit hoeherfrequentem strom
NL8701358A (nl) * 1987-06-11 1989-01-02 Philips Nv Schakelinrichting.
EP0740493B1 (fr) * 1990-09-25 2002-01-30 Matsushita Electric Works, Ltd. Appareil d'opération des lampes à décharge
CA2198173A1 (fr) * 1997-02-21 1998-08-21 Exacta Transformers Of Canada Ltd. Systeme de ballast de lampe a decharge haute intensite a microcontroleur et methode associee
JP5591124B2 (ja) * 2008-02-14 2014-09-17 コーニンクレッカ フィリップス エヌ ヴェ 放電ランプを制御する装置
RU2594353C2 (ru) * 2009-12-11 2016-08-20 Конинклейке Филипс Электроникс Н.В. Схема управления для управления нагрузочной цепью

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3066243A (en) * 1959-11-02 1962-11-27 Engelhard Hanovia Inc Starting and operating circuit for high pressure arc lamps
US3376470A (en) * 1965-08-12 1968-04-02 Atomic Energy Commission Usa Capacitor discharge circuit for starting and sustaining a welding arc
US3403293A (en) * 1966-07-29 1968-09-24 Philco Ford Corp Starter circuit for three-electrode gaseous discharge device
US3780342A (en) * 1972-03-01 1973-12-18 Gen Electric Ballast apparatus for starting and operating arc lamps
JPS5410850B2 (fr) * 1972-06-06 1979-05-10
US3890537A (en) * 1974-01-02 1975-06-17 Gen Electric Solid state chopper ballast for gaseous discharge lamps
NL179698B (nl) * 1974-09-18 1986-05-16 Philips Nv Gas- en/of dampontladingsstraler.
NL7809907A (nl) * 1978-10-02 1980-04-08 Philips Nv Menglichtinrichting.
JPS5551630A (en) * 1978-10-09 1980-04-15 Ichikoh Ind Ltd Illuminator
US4350933A (en) * 1980-11-26 1982-09-21 Honeywell Inc. Two-wire ballast for fluorescent tube dimming
US4500812A (en) * 1983-02-14 1985-02-19 Gte Products Corporation Electronic ballast circuit

Also Published As

Publication number Publication date
CA1229128A (fr) 1987-11-10
DE3245924A1 (de) 1984-06-14
US4816721A (en) 1989-03-28
JPS59117095A (ja) 1984-07-06
ATE23246T1 (de) 1986-11-15
EP0111956A1 (fr) 1984-06-27
DE3367315D1 (en) 1986-12-04

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