EP0595333B1 - Circuit d'amorage pour une lampe à décharge hautepression à vapeur métallique - Google Patents

Circuit d'amorage pour une lampe à décharge hautepression à vapeur métallique Download PDF

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Publication number
EP0595333B1
EP0595333B1 EP93117526A EP93117526A EP0595333B1 EP 0595333 B1 EP0595333 B1 EP 0595333B1 EP 93117526 A EP93117526 A EP 93117526A EP 93117526 A EP93117526 A EP 93117526A EP 0595333 B1 EP0595333 B1 EP 0595333B1
Authority
EP
European Patent Office
Prior art keywords
capacitor
ignition
switch element
voltage
lamp
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 - Lifetime
Application number
EP93117526A
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German (de)
English (en)
Other versions
EP0595333A1 (fr
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.)
Tridonic Bauelemente GmbH
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Tridonic Bauelemente GmbH
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Application filed by Tridonic Bauelemente GmbH filed Critical Tridonic Bauelemente GmbH
Publication of EP0595333A1 publication Critical patent/EP0595333A1/fr
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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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices

Definitions

  • the invention relates to an ignition circuit for a high-pressure metal vapor discharge lamp according to the preamble of claim 1.
  • Such an ignition circuit is known from DE-OS 31 08 547 and DE-OS 37 36 542.
  • the so-called burner is usually arranged in an evacuated glass bulb.
  • the burner itself consists of a glass tube which has the electrodes at its ends and in which metal vapor, preferably metal halide, forms in the operating state.
  • the piston is provided with electrical connections, preferably a screw socket.
  • the electrical connections of the piston are connected to the connections of the electrodes of the burner via connecting wires.
  • the connecting wires can hold the burner in the piston in a centered position; but it is also possible to provide additional holding wires for the positioning of the burner.
  • High-pressure metal vapor discharge lamps of the type described above and the ignition circuits required for this purpose are often also used on ships or vehicles, such as, for example, crane runways or the like, where they are exposed to strong vibrations.
  • the vibrations can cause the lead wires to the burner to break in the evacuated piston.
  • Such a break has the consequence that the current flowing through the lamp in operation is abruptly interrupted due to the vacuum prevailing in the bulb, without an arc extending the switch-off time being able to form at the point of interruption.
  • the brief switch-off of the relatively high lamp current which can be, for example, 6 A, has the effect that the energy stored in the choke leads to a high voltage surge at the series circuit comprising surge capacitor and ignition capacitor and to flow out in the form of a current caused by the series circuit of these two capacitors tries.
  • This surge can destroy the capacitors, especially if they occur repeatedly. The latter is possible because the wire ends come into contact again at the breaking point as a result of the vibrations and are interrupted again, etc.
  • the invention has for its object to take a measure in an ignition circuit of the type described in the preamble, by means of which the destruction of the capacitors of this circuit can be avoided when using lamps with an evacuated glass bulb.
  • the fuse blows immediately, with the result that further operation of the lamp is impossible before the fuse is changed.
  • the lamp can also be replaced. In this way, the capacitors of the ignition circuit are permanently protected.
  • a gas spark gap is suitable for this, for example.
  • the breakdown voltage for a gas spark gap typically used here is approximately 600 to 1,000 V.
  • the gas spark gap In the non-ignited state, the gas spark gap has a very high resistance. If it ignited against it, the resistance is very low. With ignition, the voltage on the gas spark gap is reduced to a burning voltage that is significantly lower than the breakdown voltage.
  • Gas spark gaps with an operating voltage of approximately 20 to 60 V are typically used here. If the voltage applied to the gas spark gap in the ignited state falls below the operating voltage, the gas spark gap falls back into the non-conductive state.
  • the first switch element can be a SIDAC.
  • This component differs from the second switch element in that the maximum voltage and the minimum voltage differ from one another only to a small extent.
  • the ignition circuit shown in the drawing is provided with two connections 1, 2 for the AC network and is used to ignite a high-pressure metal discharge lamp 5.
  • a connection of the lamp 5 is connected to a mains connection 2.
  • the other connection of the lamp 5 is connected to a superimposed ignition voltage device 4.
  • a series inductance 3, which is formed by a choke, is connected upstream of the superimposed ignition voltage device 4.
  • the ballast inductor 3 is on the one hand at the AC mains connection 1 and on the other hand is connected to a connection of a surge capacitor 6.
  • the other terminal of the surge capacitor 6 is connected to a terminal of an auxiliary ignition capacitor 7.
  • the other connection of the auxiliary ignition capacitor 7 is connected to the AC mains connection 2 via a fuse 16.
  • a resistor 8 is connected in parallel to the auxiliary ignition capacitor 7, which ensures compliance with the desired operating voltage range and the given limits for the phase position of the ignition pulses.
  • the connection point between the surge capacitor 6 and the auxiliary ignition capacitor 7 is connected via a high-frequency coil 14 to a connection of a first switch element 9.
  • a first switch element 9 In the present case, this is a SIDAC.
  • This switch element is normally non-conductive. It becomes conductive when the voltage applied to it exceeds a certain threshold voltage value. This applies in both polarity directions.
  • the first switch element 9 can also be a four-layer diode, for example.
  • the other connection of the switch element 9 is connected to a connection of a pulse transformer 10 connected as an autotransformer.
  • the other terminal of the pulse transformer is connected to the lamp 5.
  • the pulse transformer 10 is provided with a tap 13, which is connected to the connection point between the series inductance 3 formed by the choke and the surge capacitor 6.
  • the primary winding lies between the one connection and the tap 13.
  • the secondary winding lies between the tap 13 and the winding end connected to the lamp.
  • a transformer with separate primary and secondary windings can also be used.
  • a gas spark gap 15 is connected in parallel to the series circuit formed by the surge capacitor 6 and the auxiliary ignition capacitor 7.
  • the lamp 5 consists of the burner 17 and an evacuated glass bulb 18.
  • the electrodes are connected to corresponding connections on the piston 18 by connecting wires 19 which hold the burner 17 in the piston 18 in a centered position. But it is also possible that separate holding wires are provided for the burner 17.
  • the circuit works as follows: If the AC network is connected to the connections 1 and 2 and, for example, a positive half-wave begins, the surge capacitor 6 and the auxiliary ignition capacitor 7 are charged via the series inductance 3 formed by the choke during the rising phase of the half-wave. If the voltage across the surge capacitor 6 exceeds the voltage threshold value specified by the first switch element 9, the switch element 9 switches through, ie there is a sudden change from the non-conductive state to the conductive state. As a result, the surge capacitor 6 discharges through the switch element 9. This has the consequence that a voltage surge occurs at the tap 13 of the pulse capacitor 12, which imposes a superimposition on the mains voltage at the upper connection of the lamp 5 and can be several kV. This voltage surge leads to ionization of the lamp 5.
  • the series resonance circuit formed from the series inductance 3 and the auxiliary ignition capacitor 7 is triggered, with the result that a damped oscillation is produced.
  • This lies on the primary winding 11 of the pulse transformer 10 and is stepped up, so that after the voltage surge on the lamp 5, a decaying high-frequency oscillation of high voltage is present.
  • the resonance frequency of the series resonance circuit formed from the series inductor 3 and the auxiliary ignition capacitor 7 is selected such that at least the first half-wave of the decaying oscillation following the voltage surge strikes the still ionized lamp 5 if the lamp 5 has not already ignited the voltage surge. With the decay of the high-frequency oscillation below the voltage threshold value of the first switch element 9, this becomes non-conductive again. Then this process is repeated until the lamp ignites.
  • the gas spark gap 15 was therefore connected in parallel with the series connection of these capacitors.
  • the gas spark gap 15 is a discrete component that is normally non-conductive. However, if a maximum breakdown voltage of, for example, 800 V is exceeded on the gas spark gap, it suddenly becomes conductive, with the result that the energy stored in the inductor 3 does not flow as a current through the capacitors 6 and 7, but via the gas spark gap 15.
  • the fuse 16 is dimensioned such that it blows when the gas spark gap 15 breaks. This ensures that continued operation of a defective lamp 5 is not possible without replacing the blown fuse 16. When the fuse 16 is replaced, the defective lamp 5 can also be replaced.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Claims (5)

  1. Circuit (4) d'amorçage pour une lampe à décharge (5) à vapeur métallique à haute pression connectée à une source de courant alternatif, de préférence au réseau à courant alternatif, comprenant un ballast (3) qui est formé d'une bobine, un condensateur d'impulsion (6), un condensateur d'amorçage (7), un premier élément de commutation (9) qui, au moins dans une direction de polarité est conducteur au-dessus d'une tension maximale déterminée et non-conducteur en-dessous d'une tension minimale et avec un transformateur d'impulsion (10), la bobine, le condensateur d'impulsion (6) et le condensateur d'amorçage (7) formant un circuit série, le premier élément de commutation (9) et l'enroulement primaire du transformateur d'impulsion (10) connecté en série avec ledit premier élément de commutation étant connectés en parallèle avec le condensateur d'impulsion (6) et la bobine, l'enroulement secondaire du transformateur d'impulsion (10) et la lampe (5) formant également un circuit série qui est connecté à la source à courant alternatif, caractérisé par le fait qu'un coupe-circuit (16) à fusible est en outre connecté en série avec le circuit série formé du condensateur d'amorçage (7) et du condensateur d'impulsion (6), le circuit série formé du condensateur d'amorçage (7) et du condensateur d'impulsion (6) et du coupe-circuit (16) à fusible étant connecté à la source de courant alternatif (1,2), par le fait qu'un second élément de commutation (15) est connecté en parallèle avec le circuit série formé du condensateur d'amorçage (7) et du condensateur d'impulsion (6), lequel élément de commutation, au moins dans une direction de polarité, est conducteur au-dessus d'un tension maximale déterminée et non conducteur en-dessous d'une tension minimale, et par le fait que le coupe circuit (16) à fusible est dimensionné de telle sorte qu'il fonde lorsque le second élément de commutation (15) devient conducteur.
  2. Circuit d'amorçage selon la revendication 1, caractérisé par le fait que le deuxième élément de commutation (15) est un espacede décharge gazeuse.
  3. Circuit d'amorçage selon la revendication 2, caractérisé par le fait que la tension d'activation de l'espace de décharge gazeuse est comprise entre environ 600 et 1000 V et la tension d'arc est comprise entre environ 20 et 60 V.
  4. Circuit d'amorçage selon l'une des revendications précédentes caractérisé par le fait que le premier élément de commutation (9) est un SIDAC.
  5. Circuit d'amorçage selon l'une des revendications précédentes caractérisé par le fait que l'enroulement primaire (11) et l'enroulement secondaire (12) du transformateur d'impulsion (10) sont reliés électriquement et forment un auto-transformateur.
EP93117526A 1992-10-28 1993-10-28 Circuit d'amorage pour une lampe à décharge hautepression à vapeur métallique Expired - Lifetime EP0595333B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4236403A DE4236403A1 (de) 1992-10-28 1992-10-28 Zündschaltung für eine Hochdruckmetalldampfentladungslampe
DE4236403 1992-10-28

Publications (2)

Publication Number Publication Date
EP0595333A1 EP0595333A1 (fr) 1994-05-04
EP0595333B1 true EP0595333B1 (fr) 1997-03-12

Family

ID=6471564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93117526A Expired - Lifetime EP0595333B1 (fr) 1992-10-28 1993-10-28 Circuit d'amorage pour une lampe à décharge hautepression à vapeur métallique

Country Status (3)

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EP (1) EP0595333B1 (fr)
AT (1) ATE150248T1 (fr)
DE (2) DE4236403A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4406534C2 (de) * 1993-06-11 1998-10-29 Tridonic Bauelemente Zündgerät für Kaltstartentladungslampen
DE19544842A1 (de) * 1995-12-01 1997-06-05 Bosch Gmbh Robert Eingangsbeschaltung für eine Zündvorrichtung einer Hochdruck-Gasentladungslampe
DE19909529A1 (de) * 1999-03-04 2000-09-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Einseitig gesockelte Hochdruckentladungslampe mit im Sockel integrierter Zündvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4342948A (en) * 1979-09-20 1982-08-03 David Engineering Limited Electric discharge lamp control converter circuits
US4339695A (en) * 1980-06-05 1982-07-13 Unicorn Electrical Products High pressure sodium lamp ballast circuit
US4339692A (en) * 1980-11-18 1982-07-13 The Nuarc Company, Inc. Power supply for HID lamp
DE3736542A1 (de) * 1987-10-28 1989-05-11 Zumtobel Ag Zuendschaltung fuer eine hochdruckmetalldampfentladungslampe

Also Published As

Publication number Publication date
EP0595333A1 (fr) 1994-05-04
DE4236403A1 (de) 1994-07-07
DE59305732D1 (de) 1997-04-17
ATE150248T1 (de) 1997-03-15

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