EP2117032B1 - Agencement destiné au rayonnement UV d'objets - Google Patents

Agencement destiné au rayonnement UV d'objets Download PDF

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Publication number
EP2117032B1
EP2117032B1 EP09159395A EP09159395A EP2117032B1 EP 2117032 B1 EP2117032 B1 EP 2117032B1 EP 09159395 A EP09159395 A EP 09159395A EP 09159395 A EP09159395 A EP 09159395A EP 2117032 B1 EP2117032 B1 EP 2117032B1
Authority
EP
European Patent Office
Prior art keywords
lamp
voltage
gas discharge
starting
electrode
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.)
Not-in-force
Application number
EP09159395A
Other languages
German (de)
English (en)
Other versions
EP2117032A3 (fr
EP2117032A2 (fr
Inventor
Robert Sänger
Wilfried Henzler
Peter Dr. Schwarz-Kiene
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.)
Eta Plus Electronic GmbH and Co KG
Original Assignee
Eta Plus Electronic GmbH and Co KG
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 Eta Plus Electronic GmbH and Co KG filed Critical Eta Plus Electronic GmbH and Co KG
Publication of EP2117032A2 publication Critical patent/EP2117032A2/fr
Publication of EP2117032A3 publication Critical patent/EP2117032A3/fr
Application granted granted Critical
Publication of EP2117032B1 publication Critical patent/EP2117032B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel

Definitions

  • the invention relates to an arrangement for UV irradiation of objects, in particular for crosslinking of coatings, comprising a gas discharge space comprehensive, provided at both longitudinal ends with lamp electrodes and in the irradiation transverse to the lamp longitudinal direction or longitudinally aligned on the object elongated medium-pressure gas discharge lamp and a high voltage power supply for charging the lamp electrodes with AC voltage.
  • Such long arc lamps are mainly used in printing technology for curing of special UV-reactive paints and printing inks.
  • the excitation of the mercury plasma takes place via lamp electrodes, which are spaced apart over at least the width of the printing substrate.
  • mercury vapor pressures of up to about 0.1 MPa and correspondingly high alternating voltages between 150 V and 4 kV, a high UV yield with a long service life can be achieved.
  • These lamps can be ignited in the cold state (room temperature) by applying a comparable (only slightly increased) ignition voltage to the lamp operating voltage, since in this case the mercury vapor pressure is low and the ignition of the buffer gas (argon or similar noble gases) requires lower ignition voltages.
  • the lamp temperature increases during the start-up phase, causing the mercury vapor pressure and the pressure-dependent lamp operating voltage to rise to nominal values.
  • an immediate ignition despite high lamp temperature and associated high mercury vapor pressure is desirable.
  • the ignition under high pressure hot lamps is generally more difficult and requires much higher ignition field strengths, since the middle free path length between the collisions of the electrons with atoms is shorter, and accordingly less energy can be absorbed between two collisions. This can be compensated for by applying a higher voltage on the one hand or by shortening the effective length between the electrodes subjected to ignition voltage, for example.
  • conventional heterodyne ignitors for generating high ignition pulses are unsuitable, since these ignitors for the medium-frequency high voltage and the medium-frequency lamp current have too high reactance.
  • an ignition circuit for a high-intensity light source designed as a short arc lamp, for example an image projector, which comprises a high-voltage supply for the lamp electrodes and an auxiliary electrode which is controlled via a trigger circuit outside the discharge space.
  • the circuit serves primarily to smooth the luminous flux during polarity reversal.
  • the object of the invention is to further improve the devices known in the state of the art and, under difficult ignition conditions, to enable the most immediate (re) ignition with simple means, especially at high lamp temperatures.
  • a starting auxiliary electrode extending over a discharge region between the lamp electrodes outside the gas discharge space wherein an ignition circuit for triggering a between the lamp electrodes within the gas discharge space
  • the ignition circuit is designed to increase the voltage potential of the lamp electrodes relative to the auxiliary ignition electrode during the lamp ignition, wherein the two-ended Zündiselektrode is at a terminal end at ground potential and thus has a potential independent of the lamp electrodes potential.
  • the ignition circuit can thus be connected directly to the lamp electrodes, while the auxiliary electrode remains galvanically isolated from the lamp electrodes.
  • the ignition auxiliary electrode guided along the lamp can provide a field strength critical for impact ionization near a lamp electrode, so that the effective electrode spacing is initially significantly reduced.
  • a dielectrically impeded sliding discharge can be guided to the remote lamp electrode via the auxiliary ignition electrode, thus allowing a sheet transfer between the electrodes.
  • a rapid hot re-ignition in a medium-pressure long-arc lamp is possible.
  • a particularly advantageous embodiment provides that the ignition circuit generates one of the alternating voltage preferably superimposed as common mode voltage ignition auxiliary voltage. Due to the voltage superimposition, especially as common-mode voltage, the lamp electrodes are constantly at a high alternating voltage potential with respect to the auxiliary electrode during the ignition phase, in order to favor the above-described sliding discharge. Here, the lamp electrodes should still have a sufficiently high voltage difference against each other to convert the sliding discharge from one lamp electrode to another in an arc discharge.
  • the lamp electrodes are connected via leads to the high voltage power supply, wherein the ignition circuit is connected in the supply lines, so that no additional supply lines to the location of the lamp must be performed.
  • a further improvement can be achieved in that the high-voltage supply during lamp ignition delivers an ignition voltage which is higher than an operating voltage of the gas discharge lamp, and in that the ignition circuit is connected to the ignition circuit via a control unit AC voltage of the high voltage power supply or the lamp current of the gas discharge lamp derived switching signal can be activated. Thus, no additional synchronization for the ignition is required.
  • an ignition transformer for providing the ignition auxiliary voltage amounting to a multiple of the operating voltage. It is particularly advantageous if the ignition transformer has a primary winding and two secondary windings, wherein the primary winding is acted upon by AC voltage from the high voltage power supply or a separate voltage source and the secondary windings are in current-compensated circuit each between a tap of the primary winding and a lamp electrode. The primary winding thus generates a magnetic flux which penetrates both secondary windings in the same direction and brings the electrodes to a high potential, while in normal lamp operation, no voltage drop is caused.
  • Such a transformer works particularly well in the medium frequency range, because there the required components can be kept small. Accordingly, it is advantageous if the AC voltage is in the frequency range of 10 kHz to 1 MHz.
  • An advantageous implementation provides that the ignition circuit is connected to one of the lamp electrodes and on one side to the auxiliary ignition electrode, wherein the sliding discharge is triggered by the free, lying at a higher potential end of the auxiliary ignition electrode.
  • auxiliary ignition electrode is formed by a metallic component of the gas discharge lamp, in particular a reflector, a shutter or a housing part.
  • the lateral distance between the auxiliary ignition electrode and the gas discharge lamp during lamp ignition is smaller than in the subsequent lamp operation. This can be done in a simple way realize that the auxiliary ignition electrode is arranged on or formed by a retractable into the irradiation region between the gas discharge lamp and object shutter.
  • auxiliary ignition electrode is formed by a metallic conductor wire. It is also for the limitation of the field strength in the lamp tube advantageous if the auxiliary ignition electrode is preferably held in an insulating cladding outside at a lateral distance from a lamp tube or lamp envelope of the gas discharge lamp, so that there is no direct contact between the lamp envelope and auxiliary ignition electrode. This distance is an important aspect for a high lamp life.
  • the auxiliary ignition electrode may be formed by a lamp tube of the gas discharge lamp in combination with a surrounding fluid.
  • a liquid to be irradiated can flow through in an enveloping tube in the lamp longitudinal direction and at the same time be kept at a distance from the lamp tube.
  • the fluid should be sufficiently conductive and the lamp tube should have sufficient capacity to carry the current for the sliding discharge can.
  • the gas discharge lamp is of cylindrical design, the axial lamp length being more than twice, preferably more than five times, the lamp diameter.
  • the lamp arrangement shown in the drawing can generally be used for UV irradiation of objects, for example for surface treatment of printing substrates, for drinking water disinfection or for exhaust air treatment.
  • a UV irradiation unit or a gas discharge lamp 10 is provided, which is connected to a high voltage supply 12 and can be started (re) quickly by means of an ignition circuit 16 in the hot state via a Zündangeselektrode 14.
  • the gas discharge lamp 10 designed as a medium-pressure mercury lamp has a long cylindrical lamp tube 18 made of quartz glass, which delimits a gas discharge space 20. At the two ends of the lamp tube 18, a lamp electrode 22 is arranged in each case. The lamp electrodes 22, 22 'are connected via leads 24 to the high voltage power supply 12. A longitudinal side 26 of the lamp tube 18 is aligned with the surface of a substrate 28 to be irradiated. The UV radiation is therefore emitted here transversely to the lamp longitudinal direction on the substrate 28 shown in cross section. For example, a material web perpendicular to the plane of the Fig.
  • auxiliary ignition electrode 14 is outside of the gas discharge space 20 in an in Fig. 1 not shown to scale lateral distance and arranged extends over the discharge region or along the discharge gap between the lamp electrodes 22, 22 '.
  • auxiliary ignition electrode 14 may be provided a metal wire which is insulated in a cladding tube.
  • a metallic lamp component in particular a so-called shutter, in a dual function as auxiliary starting electrode.
  • shutter in a dual function as auxiliary starting electrode.
  • Shutter known per se can be moved into the radiation area between the lamp 18 and the object 28 in order to be able to interrupt or switch off the irradiation rapidly. In this case, the smaller distance of the closed shutter from the lamp during the shielding can be advantageously used for the electrode function.
  • the auxiliary ignition electrode 14 has a free end 30 and a connected via line 32 to the ignition circuit 16 terminal end 43, which is in the example shown at ground potential (earth terminal 36).
  • the high voltage supply 12 supplies the required lamp current in a medium frequency range of about 10 kHz to 1 MHz.
  • the plasma state is generated during a start or ignition phase by impact ionization in the gas discharge space.
  • an ignition voltage which is higher than the operating voltage, is provided to the lamp electrodes 22, 22 '.
  • an ignition auxiliary voltage is superimposed by means of the ignition circuit 16.
  • This sliding discharge then propagates in the course of one or more periods of ignition auxiliary voltage within the gas discharge space 20 to the other Lamp electrode 22 'out until finally the entire discharge path is ignited and the normal operating condition is reached.
  • Fig. 2 shows the voltage curve at the Fig. 1 apparent measuring points.
  • UL (t) is the AC voltage applied between the two lamp electrodes (no-load voltage when the lamp is not lit).
  • UZH (t) is the superimposed as common mode voltage increased ignition auxiliary voltage, which is applied between the lamp electrode 22 'and the auxiliary ignition electrode 14.
  • UE1 then designates the voltage of the lamp electrode 22 relative to the ignition auxiliary electrode 14 lying at ground potential.
  • the ignition circuit 16 is connected near the lamp 18 between the leads 24 of the electronic ballasts, for example, in a cabinet further distant high voltage power supply 12.
  • the capacitances 38 establish a connection of the high-voltage supply 12 to ground or ground potential, with a component lying on ground acting as a starting auxiliary electrode 14.
  • the ignition circuit 16 has an ignition transformer for providing the ignition auxiliary voltage. This consists of a primary winding 40 and two arranged in the leads 24 secondary windings 42.
  • the secondary windings 42 are designed in current-compensating winding, so that the current flowing through the lamp 18 operating current leads to no magnetization of the common core 44.
  • the number of turns of the primary winding 40 is smaller than the same number of turns the secondary windings 42.
  • the primary winding 40 is connected to a separate voltage source 46.
  • Fig. 4 shows a similar circuit in which the primary winding 40 is directly acted upon by the AC voltage from the high voltage supply 12.
  • a control unit 48 is provided which derives a control signal for the switch 50 from the rms value of the AC voltage supplied by the high-voltage supply 12.
  • the voltage difference between the open circuit voltage and the ignition voltage of the high voltage power supply 12 is detected and converted into a control signal for the switch 50.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Claims (13)

  1. Arrangement d'irradiation aux UV d'objets, notamment pour la réticulation de revêtements, comprenant
    a) une lampe à décharge gazeuse à moyenne pression (10), comprenant un espace de décharge de gaz (20), munie à ses deux extrémités longitudinales d'électrodes de lampe (22) et orientée sur l'objet (28) par le côté longitudinal lors de l'irradiation, et
    b) une alimentation en haute tension (12) pour appliquer une tension alternative aux électrodes de lampe (22),
    c) une électrode d'aide à l'amorçage (14) qui s'étend sur une zone de décharge entre les électrodes de lampe (22) à l'extérieur de l'espace de décharge de gaz (20), et
    d) un circuit d'amorçage (16) pour déclencher, au moyen de l'électrode d'aide à l'amorçage (14), une décharge gazeuse qui se propage entre les électrodes de lampe (22) à l'intérieur de l'espace de décharge de gaz (20),
    e) le circuit d'amorçage (16) augmentant le potentiel de tension des électrodes de lampe (22) par rapport à l'électrode d'aide à l'amorçage (14) pendant l'amorçage de la lampe,
    caractérisé en ce que
    f) une extrémité (34) de l'électrode d'aide à l'amorçage (14) se trouve au potentiel de la terre.
  2. Arrangement selon la revendication 1, caractérisé en ce que le circuit d'amorçage (16) génère une tension d'aide à l'amorçage superposée à la tension alternative, de préférence sous la forme d'une tension en mode commun.
  3. Arrangement selon l'une des revendications 1 ou 2, caractérisé en ce que le circuit d'amorçage (16) est raccordé aux électrodes de lampe (22) et en ce que l'électrode d'aide à l'amorçage (14) est isolée galvaniquement des électrodes de lampe (22).
  4. Arrangement selon l'une des revendications 1 à 3, caractérisé en ce que les électrodes de lampe (22) sont reliées à l'alimentation en haute tension (12) par le biais de câbles d'arrivée (24) et en ce que le circuit d'amorçage (16) est disposé dans les câbles d'arrivée (24).
  5. Arrangement selon l'une des revendications 1 à 4, caractérisé en ce que l'alimentation en haute tension (12), pendant l'amorçage de la lampe, délivre une tension d'amorçage accrue par rapport à la tension de service de la lampe à décharge gazeuse (10).
  6. Arrangement selon l'une des revendications 1 à 5, caractérisé en ce que le circuit d'amorçage (16) peut être activé par le biais d'une unité de commande (48) par un signal de commutation dérivé de la tension alternative de l'alimentation en haute tension (12) ou du courant de lampe de la lampe à décharge gazeuse (10).
  7. Arrangement selon l'une des revendications 1 à 6, caractérisé par un transformateur d'amorçage (40, 42, 44) pour délivrer la tension d'aide à l'amorçage, le transformateur d'amorçage possédant un enroulement primaire (40) et deux enroulements secondaires (42), l'enroulement primaire (40) étant exposé à la tension alternative de l'alimentation en haute tension (12) ou d'une source de tension (46) séparée et les enroulements secondaires (42) se trouvant dans un circuit à compensation de courant à chaque fois entre une prise de l'enroulement primaire (40) et une électrode de lampe (22).
  8. Arrangement selon l'une des revendications 1 à 7, caractérisé en ce que le circuit d'amorçage (16) est raccordé à l'une des électrodes de lampe (22) et d'un côté à l'électrode d'aide à l'amorçage (14), la décharge superficielle étant déclenchée par le biais de l'extrémité libre (30) de l'électrode d'aide à l'amorçage (14).
  9. Arrangement selon l'une des revendications 1 à 8, caractérisé en ce que la tension alternative se trouve dans la plage de fréquences de 10 kHz à 1 MHz.
  10. Arrangement selon l'une des revendications 1 à 9, caractérisé en ce que l'électrode d'aide à l'amorçage (14) est formée par un composant métallique de la lampe à décharge gazeuse (10), notamment un réflecteur, un obturateur ou une partie du boîtier, et en ce que l'écart latéral entre l'électrode d'aide à l'amorçage (14) et la lampe à décharge gazeuse (10) pendant l'amorçage de la lampe est plus petit que pendant le fonctionnement de la lampe qui suit.
  11. Arrangement selon l'une des revendications 1 à 9, caractérisé en ce que l'électrode d'aide à l'amorçage (14) est formée par un fil conducteur métallique.
  12. Arrangement selon l'une des revendications 1 à 11, caractérisé en ce que l'électrode d'aide à l'amorçage (14) est maintenue du côté extérieur à un écart latéral d'un tube de lampe (18) de la lampe à décharge gazeuse (10), de sorte qu'il n'existe aucun contact direct entre l'électrode d'aide à l'amorçage (14) et le tube de lampe (18).
  13. Arrangement selon l'une des revendications 1 à 9, caractérisé en ce que l'électrode d'aide à l'amorçage (14) est formée par un tube de lampe (18) de la lampe à décharge gazeuse (10) en combinaison avec un fluide environnant.
EP09159395A 2008-05-06 2009-05-05 Agencement destiné au rayonnement UV d'objets Not-in-force EP2117032B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008023817A DE102008023817A1 (de) 2008-05-06 2008-05-06 Anordnung zur UV-Bestrahlung von Objekten

Publications (3)

Publication Number Publication Date
EP2117032A2 EP2117032A2 (fr) 2009-11-11
EP2117032A3 EP2117032A3 (fr) 2011-03-16
EP2117032B1 true EP2117032B1 (fr) 2012-04-25

Family

ID=40756247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09159395A Not-in-force EP2117032B1 (fr) 2008-05-06 2009-05-05 Agencement destiné au rayonnement UV d'objets

Country Status (3)

Country Link
EP (1) EP2117032B1 (fr)
AT (1) ATE555493T1 (fr)
DE (1) DE102008023817A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0181666B1 (fr) * 1984-11-06 1990-01-03 Koninklijke Philips Electronics N.V. Lampe à décharge haute-pression
DE19916474A1 (de) 1999-04-13 2000-10-26 Ist Metz Gmbh Bestrahlungsgerät
JP2002270386A (ja) * 2001-03-13 2002-09-20 Ushio Inc 光源装置
JP2006344495A (ja) * 2005-06-09 2006-12-21 Ushio Inc 放電ランプ点灯装置

Also Published As

Publication number Publication date
EP2117032A3 (fr) 2011-03-16
ATE555493T1 (de) 2012-05-15
DE102008023817A1 (de) 2009-11-19
EP2117032A2 (fr) 2009-11-11

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