EP1741319A1 - Dispositif pour produire un train d'impulsions de tension electrique, notamment pour faire fonctionner des lampes a decharge capacitive - Google Patents

Dispositif pour produire un train d'impulsions de tension electrique, notamment pour faire fonctionner des lampes a decharge capacitive

Info

Publication number
EP1741319A1
EP1741319A1 EP05747449A EP05747449A EP1741319A1 EP 1741319 A1 EP1741319 A1 EP 1741319A1 EP 05747449 A EP05747449 A EP 05747449A EP 05747449 A EP05747449 A EP 05747449A EP 1741319 A1 EP1741319 A1 EP 1741319A1
Authority
EP
European Patent Office
Prior art keywords
voltage
switching elements
voltage pulse
choke
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.)
Withdrawn
Application number
EP05747449A
Other languages
German (de)
English (en)
Inventor
Wolfgang Heering
Hans-Peter Daub
Richard Winkelmann
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Universitaet Karlsruhe
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 Universitaet Karlsruhe filed Critical Universitaet Karlsruhe
Publication of EP1741319A1 publication Critical patent/EP1741319A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/2806—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without electrodes in the vessel, e.g. surface discharge lamps, electrodeless discharge lamps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • the present invention relates to a device for generating electrical voltage pulse trains, in particular for operating capacitive discharge lamps, with at least two controllable switching elements for generating the voltage pulse trains from a DC voltage of a voltage source applied to an input.
  • Suitable electrical voltage pulse sequences must be generated and applied for the efficient operation of barrier discharges in dielectrically disabled discharge lamps.
  • Dielectric-barrier discharge lamps (DBE) have different capacities depending on the design.
  • the ballasts required to operate these lamps must be adapted to the capacity of the discharge lamp. So far, this has led to a restriction of the available lamp types and lamp sizes, since different ballasts are required for different lamp types and lamp sizes, or a special adaptation of the ballasts to the respective lamp has to be carried out.
  • Ballasts for dielectrically handicapped discharge lamps are known to date, which use a full-bridge circuit arrangement to generate a high-frequency sine-like AC voltage from a DC voltage.
  • An example of this is the ballast from J. Kunze et al. , "Resonant Power Supply for Barrier Discharge UV Excimer Sources" IEEE Industry Application Society Annual Meeting, Houston, USA, 1992, pages 750-753.
  • EP 0781078 A2 discloses a circuit arrangement for generating voltage pulse trains for the operation of dielectrically impeded discharges, which generates a unipolar voltage pulse train.
  • This circuit arrangement has one of an input Voltage-fed charging circuit with a charging capacitor, a discharge and pulse circuit with fast controllable switching elements and a pulse transformer with a load that can be connected to it. By suitable control of the switching elements, the electrical energy stored in the charging capacitor is periodically transmitted to the load, the DBE, via the pulse transformer.
  • ballasts must also be adapted to the capacity of the connected discharge lamp by a specialist.
  • EP 1110434 B1 describes an electronic ballast and an operating method for a discharge lamp with dielectrically impeded discharge, in which a swinging over of the dielectric discharge is used to initiate re-ignition and thus to improve the efficiency of the lamp.
  • EP 1176853 AI describes a circuit topology of a device for operating a discharge lamp with dielectrically impeded discharge, which has two or four inverse diodes for regenerating energy that is not required.
  • a circuit arrangement known as ARCPI Advanced Resonant Commutated Pole Inverter
  • ARCPI Advanced Resonant Commutated Pole Inverter
  • the throttle is switched via a separate switch only for reloading in the charging circuit in order to To be able to switch switching elements in voltage zero crossings.
  • An implementation of this circuit technology for the operation of lights is not known due to the different requirements.
  • the object of the present invention is to provide a device for generating electrical voltage pulse trains which is particularly suitable for the operation of dielectrically disabled discharge lamps and which enables an automatic adaptation to the capacity of the load to be operated.
  • the object is achieved with the device according to
  • the present device with at least two controllable switching elements for generating unipolar or bipolar voltage pulse sequences from a DC voltage of a voltage source present at an input is characterized in that a storage choke which can be operated via the switching elements as a controlled current source is arranged between the switching elements, so that a charging time of the storage choke that can be set by the switching elements, the rise times of voltage pulses of the voltage pulse sequences at a load coupled to the output of the device can be influenced, and that inverse diodes for the recovery of unnecessary choke energy Connect the choke to the positive or negative pole of the DC voltage source
  • the development of the present device is based on the knowledge that a dielectric barrier discharge lamp has the optimum lamp efficiency if the rising edge of the voltage applied to the lamp has a certain steepness.
  • the ballast can then be adapted to the lamp by suitably setting this slope or the associated rise time of the voltage.
  • the slope of the voltage rising edge and optionally also the falling edge can be changed solely by controlling the switching elements differently, so that the circuit no longer has to be modified to adapt to different loads.
  • This is realized by a controlled current source in the form of a storage choke in the circuit arrangement, via whose charging time, which can be controlled via the switching elements, the rise time and thus the steepness of the rise edge of the voltage pulses on the load can be influenced.
  • ballast Current with which the choke then reloads the capacity of the connected load.
  • the rise time of the voltage at the load is thus set with the size of the current which drives the storage inductor.
  • a measuring device is used for the direct or indirect detection of the rise time of the voltage at the load in connection with a digital regulation, which controls the switching processes of the switching elements for charging and discharging the storage choke in such a way that a specifiable one Rise time or steepness of the voltage rising edges is observed.
  • ballast Sizes and thus capacities are to be used for illuminated advertising purposes.
  • the ballast can also be used for other loads to be operated with electrical voltage pulse trains that require comparable transient charging currents.
  • FIG. 1 shows a first example of an embodiment of the present device for generating bipolar voltage pulse sequences
  • FIG. 2 shows an example of control signals for operating the device according to FIG. 1
  • 3 shows an example of the course of the lamp voltage with different charging times of the storage inductor of the device according to FIG. 1
  • 4 shows a second example of an embodiment of the present device for generating unipolar voltage pulse sequences
  • 5 shows an example of control signals for operating the device according to FIG. 4
  • 6 shows an example of a measuring circuit for detecting the rise time of the lamp voltage
  • FIG. 7 shows a third example of an embodiment of the present device for generating voltage pulse trains.
  • FIG. 1 shows a first example of a possible embodiment of the present device which is based on the circuit concept of the ARCPI circuit. This circuit concept was changed in the present device in such a way that an independent adaptation of the ballast to the capacity of the barrier discharge of a DBE is possible.
  • the Circuit arrangement is composed of four switching elements IGBT1, IGBT2, MOS1 and MOS2, which are connected to form a bridge circuit. There is one between the two first switching elements IGBT1 and IGBT2 and the two second switching elements MOS1 and MOS2
  • Storage choke Ll arranged, which is operated as a controlled current source.
  • the voltage pulse sequences that can be generated by suitable control of the four switching elements are applied to the transformer TR by means of a separating capacitance C2 for decoupling direct currents.
  • the unipolar square wave voltage at the output of the upper half bridge becomes a bipolar square wave voltage on the primary side of the transformer.
  • the load is present on the secondary side of the transformer, in the present example a dielectric barrier discharge lamp, which is represented by the equivalent circuit diagram with the capacitances Cdl, Cgap, Cd2 and the plasma current II.
  • the rise and fall times of the voltage at the barrier discharge of the discharge lamp can be set by differently long charging times of the storage inductor L1, which makes up the essential component of this circuit. This influences the coupling of power into the barrier discharge and enables adaptation to different capacities of the barrier discharge.
  • the output voltage V A of the bridge circuit is together with the current I Li via the storage inductor Ll and the associated control signals for the switching elements implemented by power semiconductors in FIG. 2.
  • the switching elements can of course also be realized by semiconductor elements other than those shown. Also, for example, MOSFETs can also be used instead of the IGBT's IGBT1 and IGBT2.
  • the bridge control signals for the operation of the circuit arrangement in FIG. 1 can be seen in FIG. Due to the charging time of the storage inductor, which can be controlled via the combination of the switching processes and which serves as an inductive energy store, the rising edge and the voltage pulses generated during the discharge can be set. This is done by a corresponding control circuit in which the switching cycles can be configured.
  • Figure 3 shows an example of different rising edges of the lamp voltage U a , which are obtained by different charging times of the choke L1.
  • the stress curve was calculated on the basis of a simulation model.
  • a ballast for dielectrically disabled discharge lamps is provided, with which the voltage in the parameters frequency, amplitude, rise time and fall time as well as pulse-pause ratio (duty cycle) can be changed in the following areas:
  • Frequency f 1 kHz - 200 kHz, especially 20 kHz - 100 kHz tftnction / V / ftbf ll / k: 10 nS - 1000 nS, especially 90 ns - 500 ns duty cycle: 0.1% - 99, 9% especially 1% - 70%,
  • ⁇ U lamp 0 V - 10 kV, especially 0 V - 4 kV.
  • a measuring device 2 is preferably used to record the rise time or slope of the generated voltage pulses, which feeds the measurement data to a digital control 1.
  • the digital control monitors these rise times and controls the loading times of the storage inductor Ll in order to maintain a predeterminable edge steepness. This is indicated schematically in Figure 4.
  • FIG. 4 shows a further example of an embodiment of the present device with which, in contrast to the circuit arrangement of FIG. 1, is unipolar
  • Voltage pulses are generated.
  • only two switching elements IGBT1 and MOS2 are required in order to be able to generate the unipolar voltage pulse sequences with an adjustable slope.
  • the storage choke Ll is also arranged within the bridge circuit. This configuration of the device also enables the ballast to be independently adapted to a capacitive load by controlling or regulating the rise time of the voltage edge.
  • a particular advantage of this embodiment of the device over the bipolar variant of the figure 1 consists in the lower component expenditure and the smaller voltage time area, which is present on the primary side of the transformer TR. This means that a smaller cross-sectional area is required for the transformer core than for the bipolar variant if it is to be ensured that the transformer core does not become saturated.
  • Another advantage is the possibility of triggering the lamp to re-ignite when the switch MOS2 is closed, if the voltage across the gap capacitance (Cgap) has not dropped too much after the first ignition. In the present example, this is achieved by closing the switch approx. 1-3 ⁇ s after the first ignition. As a result, the charge stored on the dielectric capacitors can also be used for generating radiation.
  • FIG. 5 in turn shows the bridge control signals, the voltage V A and the current I L ⁇ via the storage inductor Ll.
  • the rising edge of the voltage across the load can be set or regulated in a wide range independently of the size of the capacity of the load over the length of the charging time of the storage inductor L1 which can be controlled with the switching elements IGBTl and MOS2.
  • IGBTl and MOS2 switching elements
  • MOSFET for controlling the charging time of the storage choke Ll possible.
  • a direct one can be used to measure the rise time of the lamp voltage with the measuring device 2
  • This current is tapped by a current measuring coil with n turns. I c / n flows through them. This means that electrical isolation from the lamp voltage is achieved. If this current is at a maximum at the time of the switchover, it charges the capacitor Ci to a maximum voltage. Then the resistor Ri takes over the further current flow. In the time until the next positive voltage edge d. slowly over resistors Ri and R 2 . A positive voltage edge occurs again at the beginning of the new period Ci is reloaded. This process is repeated periodically. A peak value is stored in the capacitor C x . The voltage at O. is directly dependent on the maximum dU a / dt. Since it is available throughout the entire period and only drops slowly, sampling is not critical in terms of time. It is measured with an A / D converter about 2 ⁇ s after charging and used to calculate the manipulated variable for controlling the rising flank.
  • Switching elements used power semiconductors can regulate the speed of the rising flank. This regulation is sufficient to set rising edges in the range between 100 ns and 500 ns. In this way, an automatic adaptation of the ballast to different lamp types can be achieved.
  • the energy that can be stored in a storage choke currently in use is therefore sufficient to charge a capacitor with a capacitance of 4nF by a ⁇ U of 2 kV.
  • FIG. 7 finally shows a further example of an embodiment of the present device, with which unipolar voltage pulses are also generated.
  • S1 and S2 are used for switching elements, with D1 to D4 diodes.
  • the storage inductor Ll is loaded between the switching elements S1 and S2. If the storage choke Ll has stored enough energy, the switching element S2 is rendered non-conductive, so that the current no longer flows through the elements D4 and S2, but rather charges the lamp (DBE) via the capacitor C2 and the transformer TR. The voltage at the lamp and at point V A increases. Will the
  • the ignition voltage of the lamp If the ignition voltage of the lamp is reached, it ignites and the energy is absorbed by it. If the lamp does not ignite or does not absorb all of the energy provided, there is a voltage surge at the lamp and at point V A. If the voltage surge at V A is large enough compared to the voltage supply at the input, then the current in the storage choke Ll turns around and flows back into the voltage supply via the inverse diode D2. As soon as the reverse current flows through the inverse diode D2, the switching element S1 is switched off almost without voltage and thus with little loss
  • the switching element S2 is switched on hard (lossy) (made conductive).
  • the lamp ignites a second time, caused by the remaining charge on the lamp (DBE). If not all energy is absorbed by the lamp during the second ignition, a negative voltage builds up between the points V A and the negative supply connection after the second lamp ignition. This voltage is then reduced in a circulating current via the components D4, S2, D3 and Ll until the entire energy is converted into heat. There is no further energy in the circuit, ie no parasitic oscillation processes take place until the next charging process of the storage inductor.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un dispositif pour produire un train d'impulsions de tension électrique, notamment pour faire fonctionner des lampes à décharge capacitive. Ce dispositif comprend au moins deux éléments de commutation (S1, S2) pouvant être commandés, servant à produire des trains d'impulsions de tension unipolaires et bipolaires à partir d'une tension continue provenant d'une source de tension et appliquée à une entrée. Ce dispositif est caractérisé en ce qu'une bobine d'accumulation (L1), fonctionnant comme source de courant commandée par l'intermédiaire des éléments de commutation (S1, S2), est placée entre ces derniers (S1, S2) de sorte qu'un temps de charge de la bobine d'accumulation (L1) pouvant être ajusté par l'intermédiaire des éléments de commutation (S1, S2) puisse influer sur le temps de montée des impulsions de tension du train d'impulsions de tension appliquées à une charge couplée à la sortie. Ledit dispositif est également caractérisé en ce que des diodes inverses servant à réacheminer l'énergie non utilisée raccordent la bobine d'accumulation (L1) au pôle positif ou négatif de la source de tension continue. Le dispositif selon l'invention permet de réaliser un ballast pour des lampes à décharge à barrière diélectrique, qui s'adapte automatiquement à la capacité de la lampe à décharge concernée.
EP05747449A 2004-04-30 2005-04-29 Dispositif pour produire un train d'impulsions de tension electrique, notamment pour faire fonctionner des lampes a decharge capacitive Withdrawn EP1741319A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004021243A DE102004021243B3 (de) 2004-04-30 2004-04-30 Vorrichtung zur Erzeugung von elektrischen Spannungsimpulsfolgen, insbesondere zum Betrieb von kapazitiven Entladungslampen und ihre Verwendung
PCT/DE2005/000793 WO2005107339A1 (fr) 2004-04-30 2005-04-29 Dispositif pour produire un train d'impulsions de tension electrique, notamment pour faire fonctionner des lampes a decharge capacitive

Publications (1)

Publication Number Publication Date
EP1741319A1 true EP1741319A1 (fr) 2007-01-10

Family

ID=34969017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05747449A Withdrawn EP1741319A1 (fr) 2004-04-30 2005-04-29 Dispositif pour produire un train d'impulsions de tension electrique, notamment pour faire fonctionner des lampes a decharge capacitive

Country Status (3)

Country Link
EP (1) EP1741319A1 (fr)
DE (1) DE102004021243B3 (fr)
WO (1) WO2005107339A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103088080B (zh) 2004-10-07 2016-02-17 味之素株式会社 生产碱性物质的方法
CN102474963A (zh) * 2009-06-30 2012-05-23 皇家飞利浦电子股份有限公司 用于将dc转换成ac脉冲电压的电路
EP2389047B1 (fr) 2010-05-14 2012-11-28 Karlsruher Institut für Technologie Agencement de commutation et procédé pour le fonctionnement efficace d'une charge capacitive
DE102014005669B4 (de) * 2014-04-19 2017-10-26 Iie Gmbh & Co. Kg Vorrichtung und Verfahren zum Betreiben eines Lichterzeugers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19548003A1 (de) * 1995-12-21 1997-06-26 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zur Erzeugung von Impulsspannungsfolgen, insbesondere für den Betrieb von dielektrisch behinderten Entladungen
DE19839336A1 (de) * 1998-08-28 2000-03-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektronisches Vorschaltgerät für Entladungslampe mit dielektrisch behinderten Entladungen
DE19839329A1 (de) * 1998-08-28 2000-03-09 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektronisches Vorschaltgerät für Entladungslampe mit dielektrisch behinderten Entladungen
EP1176853B1 (fr) * 1999-10-18 2008-04-02 Ushio Denki Kabushiki Kaisya Source d'eclairage de lampe a decharge a barriere dielectrique
DE10011484A1 (de) * 2000-03-09 2001-09-13 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verbessertes Pulsbetriebsverfahren für eine Stille Entladungslampe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005107339A1 *

Also Published As

Publication number Publication date
DE102004021243B3 (de) 2005-12-29
WO2005107339A1 (fr) 2005-11-10

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