EP2257134B1 - Agencement de commutation destiné au fonctionnement d'une commutation en série d'au moins deux lampes à décharge basse pression et procédé correspondant - Google Patents

Agencement de commutation destiné au fonctionnement d'une commutation en série d'au moins deux lampes à décharge basse pression et procédé correspondant Download PDF

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Publication number
EP2257134B1
EP2257134B1 EP10161981A EP10161981A EP2257134B1 EP 2257134 B1 EP2257134 B1 EP 2257134B1 EP 10161981 A EP10161981 A EP 10161981A EP 10161981 A EP10161981 A EP 10161981A EP 2257134 B1 EP2257134 B1 EP 2257134B1
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EP
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Prior art keywords
connection
arrangement
pair
capacitor
terminal
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Not-in-force
Application number
EP10161981A
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German (de)
English (en)
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EP2257134A1 (fr
Inventor
Bernd Rudolph
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Osram GmbH
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Osram GmbH
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    • 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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps

Definitions

  • Circuit arrangement for operating a series circuit of at least two low-pressure gas discharge lamps and corresponding method
  • the invention relates to a circuit arrangement for operating a series connection of at least one first and one second low-pressure gas discharge lamp, having an input with a first and a second input terminal for applying an AC supply voltage, an output having at least a first terminal arrangement, the first and a second terminal pair for connecting the first low-pressure gas discharge lamp, and a second connection arrangement, which has a first and a second terminal pair for connecting the second low-pressure gas discharge lamp, wherein a first terminal of the second terminal pair of the first terminal arrangement with a first terminal of the first terminal pair of the second terminal arrangement is coupled, a resonant circuit having a coupled between the first input terminal and a first terminal of the first terminal pair of the first terminal arrangement resonant choke and a resonance capacitor r, which is coupled between the first terminal pair of the first terminal arrangement and the second terminal pair of the second terminal arrangement.
  • the invention also relates to a method of operating a series circuit of at least a first and a second low-pressure gas discharge lamp on such a circuit arrangement.
  • Circuit arrangements for operating a series circuit of a plurality of low-pressure gas discharge lamps are already known from the prior art.
  • Such circuitry includes a resonant circuit including a resonant choke and a resonant capacitor; the resonance capacitor is connected in parallel with the series connection of the gas discharge lamps.
  • the interest is in particular the preheating of electrodes of the gas discharge lamps. It is state of the art to use additional heating coils on the resonance choke for this purpose. By such an approach, on the one hand, not inconsiderable continuous heating powers occur in the electrodes, which adversely affects the efficiency of the entire system including the circuit arrangement and the gas discharge lamps. On the other hand, several heating coils - three additional heating coils are usually used in a series connection of two gas discharge lamps - consuming to wrap, lead and isolate. In particular, the isolation of many additional heating coils is costly.
  • the circuit arrangement described in this document comprises a heating circuit with the aid of which the electrodes of two gas discharge lamps can be preheated.
  • a heating circuit has, for a series connection of two lamps, a separate heating transformer, a bridge rectifier, two transistors (one of which is a voltage-proof power supply), a plurality of diodes, as well as a plurality of ohmic resistors.
  • circuit arrangement of the type mentioned further comprises a capacitive voltage divider.
  • This voltage divider has a parallel to the first terminal assembly coupled first capacitor and a parallel to the second connection arrangement coupled second capacitor.
  • the effect according to the invention is achieved by a capacitive voltage divider, by means of which an electrical voltage applied between the first connection pair of the first connection arrangement and the second connection pair of the second connection arrangement is divided.
  • a capacitive voltage divider by means of which an electrical voltage applied between the first connection pair of the first connection arrangement and the second connection pair of the second connection arrangement is divided.
  • the ratio of the current intensity of the current flowing through the "outer" electrodes - those electrodes which are coupled to the first terminal pair of the first terminal arrangement and the second terminal pair of the second terminal arrangement - during preheating to the current intensity of this current during operation that is after ignition of the gas discharge lamps.
  • the ratio of the current of the Dauerterrorismstroms to the current of the preheating, or the ratio of the Treasureroniados to preheating reduced.
  • This reduction is attributable to the fact that the current intensity of the current flowing via the "outer" electrodes of the gas discharge lamps or via the resonance capacitor is determined directly by the amplitude of the voltage applied to the resonance capacitor.
  • circuit arrangement according to the invention it is possible with the circuit arrangement according to the invention to reliably preheat the outer electrodes of the gas discharge lamps; On the other hand, the circuit arrangement according to the invention results in significantly reduced losses in continuous operation. This succeeds in the circuit arrangement according to the invention without the use of a large number of expensive active and passive components, as described in the subject matter according to document DE 44 25 859 A1 be used.
  • the circuit arrangement according to the invention solves the above object with only a capacitive voltage divider, which makes them more cost-effective and component reduced as the known circuit arrangements can be made.
  • the capacitance values of both the first and second capacitors are preferably smaller than the capacitance value of the resonance capacitor. In this way, a reliable ignition of the gas discharge lamps can be made possible.
  • the capacitance values of the first and second capacitors may be 5% to 25% of the capacitance value of the resonant capacitor.
  • the first and the second capacitor should be chosen so large that the parasitic capacitances of the first and the second terminal arrangement do not affect the voltage distribution across the lamps.
  • the first and the second capacitor each have a capacitance value from a value range of 10 pF to 5 nF, preferably from a value range of 100 pF to 2.5 nF. Then, the above requirements regarding the voltages at the gas discharge lamps are satisfied.
  • the capacitance value of the first capacitor may be 1 nF and the capacitance value of the second capacitor 560 pF and the capacitance value of the resonant capacitor 10 may be nF.
  • the capacitance value of the first capacitor preferably differs from the capacitance value of the second capacitor.
  • the gas discharge lamps are ignited sequentially, that is, one after the other.
  • the first breaks Voltage to a first of the gas discharge lamps, which has an immediate increase in the voltage across the other gas discharge lamp and thereby the ignition of this gas discharge lamp result.
  • the ratio of the capacitance values of the two capacitors is preferably in a value range of 0.5 to 0.8. For example, this ratio may be 2/3.
  • the present circuit arrangement comes with only a single additional winding at the resonance choke (provided that two gas discharge lamps are operated).
  • the resonance choke as a component can thus in comparison to the prior art be made much easier and cheaper; the additional winding can be isolated from the main winding of the resonance choke without much effort.
  • more winding space is available for the main winding of the resonance choke, so that the thermal problems occurring in the prior art are effectively counteracted.
  • a dummy element in particular a choke, can be coupled between the terminals of the first terminal pair of the first terminal arrangement and / or between the terminals of the second terminal pair of the second terminal arrangement.
  • An inventive method is designed to operate a series circuit of at least a first and a second low-pressure gas discharge lamp to a circuit arrangement of the type mentioned.
  • an electrical voltage applied between the first connection pair of the first connection arrangement and the second connection pair of the second connection arrangement is divided by means of a capacitive voltage divider, which has a first capacitor coupled in parallel with the first connection arrangement and coupled in parallel with the second circuit arrangement having second capacitor.
  • a circuit arrangement 1 shown in the figure comprises an input 2 with a first input terminal 3 and a second input terminal 4.
  • the second input terminal 4 represents a reference potential of a control unit, not shown in the figure. With this reference potential is also not shown in the figure and coupled by the control unit controllable inverter, which provides a supply AC voltage U v .
  • This alternating supply voltage U v is applied between the first and the second input terminal 3, 4.
  • the AC supply voltage U v generated by the inverter from a DC link DC voltage, which is not shown in the figure DC bus capacitor is applied.
  • the DC link DC voltage is applied between a DC link 5 and the reference potential 4 of the control unit.
  • the circuit arrangement 1 also comprises an output with a first and a second connection arrangement, respectively for connecting a low-pressure gas discharge lamp 6, 7.
  • the first connection arrangement comprises a first terminal pair 8 with a first and a second terminal 8a, 8b and a second terminal pair 9 with a first and a second terminal 9a, 9b.
  • the second connection arrangement comprises a first connection pair 10 with a first connection 10a and a second connection 10b and a second connection pair 11 with a first connection 11a and a second connection 11b.
  • the first terminal 9a of the second terminal pair 9 of the first terminal arrangement is directly connected to the first terminal 10a of the first terminal pair 10 of the second terminal arrangement.
  • the first input terminal 3 of the input 2 is coupled via a resonance choke 12 to the first terminal 8a of the first terminal pair 8 of the first terminal arrangement.
  • the resonant choke 12 together with a resonant capacitor 13 forms a resonant circuit of the circuit arrangement 1.
  • the resonant capacitor 13 is between the second terminal 8b of the first terminal pair 8 of the first terminal arrangement and the second terminal 11b of the second terminal pair 11 of the second Connection arrangement switched.
  • the inductance value of the resonance choke 12 in the exemplary embodiment is 1.3 mH and the capacitance value of the resonance capacitor 13 is 7.5 nF.
  • an additional winding 14 is wound on the same component, via which the inner electrodes of the gas discharge lamps 6, 7 can be preheated.
  • the internal electrodes of the gas discharge lamps 6, 7 are understood to mean those electrodes which are connected to the second terminal pair 9 of the first terminal arrangement and to the first terminal pair 10 of the second terminal arrangement.
  • the additional winding 14 is coupled via a capacitor 15 to the second terminal 9b of the second terminal pair 9 of the first terminal arrangement.
  • the auxiliary winding 14 is connected to the second terminal 10b of the first terminal pair 10 of the second terminal arrangement.
  • Those electrodes of the gas discharge lamps 6, 7 which are coupled to the first terminal pair 8 of the first terminal arrangement and the second terminal pair 11 of the second terminal arrangement are referred to below as outer electrodes.
  • a capacitive voltage divider 16 is connected in parallel with the resonance capacitor 13.
  • the capacitive voltage divider 16 comprises a first capacitor 16a and a second capacitor 16b.
  • the first capacitor 16a is between the first terminal 8a of the first terminal pair 8 and the first terminal 9a of the second terminal pair 9 of the first terminal arrangement connected.
  • the first capacitor 16a is connected in parallel to the first terminal arrangement.
  • the second capacitor 16b is connected between the first terminal 10a of the first terminal pair 10 and the first terminal 11a of the second terminal pair 11 of the second terminal arrangement.
  • the second capacitor 16b is connected in parallel to the second terminal arrangement.
  • the capacitive voltage divider 16 must be coupled to the outer terminals 8, 11.
  • the connection point arranged between the capacitors 16a, 16b must be connected to exactly one of the connections 9 (9a or 9b) or 10 (10a or 10b).
  • the capacitance values of the first and second capacitors 16a, 16b in the exemplary embodiment are 1 nF and 560 pF, respectively.
  • the circuit arrangement 1 also has a first and a second coupling capacitor 17, 18.
  • the first terminal 11a of the second terminal pair 11 of the second terminal arrangement is connected via the first coupling capacitor 17 to the DC link 5, that is electrically decoupled from the DC link 5 by means of the first coupling capacitor 17.
  • the first terminal 11a of the second terminal pair 11 of the second terminal arrangement is connected via the second coupling capacitor 18 to the reference potential 4 of the control unit.
  • the two coupling capacitors 17, 18 ensure that no direct currents can flow via the gas discharge lamps 6, 7. Such DC currents could lead to an apparent inhomogeneity of the gas discharge lamps 6, 7 radiated light lead (cataphoresis).
  • the advantage is achieved by the symmetrical arrangement of the coupling capacitors 17, 18, that the current load of the DC link capacitor is the lowest.
  • a throttle 19 is connected between the first and the second connection 8a, 8b of the first connection pair 8 of the first connection arrangement. Accordingly, a throttle 20 is connected between the first and the second connection 11a, 11b of the second connection pair 11 of the second connection arrangement.
  • the throttles 19, 20 have the task of minimizing the Treasureußpare or the pin currents of the gas discharge lamps 6, 7.
  • the control unit initiates the preheat phase by setting the frequency of the AC supply voltage U V to a preheat frequency.
  • the alternating supply voltage U V is thus set such that the gas discharge lamps 6, 7 are not yet ignited.
  • the presence of the capacitive voltage divider 16 makes it possible to set the voltage applied to the resonance capacitor 13 during the preheating phase to a value which is higher than the ignition voltage of a single gas discharge lamp 6, 7. In this way, the outer electrodes of the gas discharge lamps 6, 7 with relatively high currents - the current strength of the current flowing through the resonant capacitor 13 current is determined by the amplitude of the voltage - acted upon and thereby reliably preheated.
  • the ratio of the current intensity of the continuous heating current flowing in operation via the outer electrodes to the current intensity of the preheating current flowing through the resonance capacitor 13 during the preheating phase is reduced by the use of the capacitive voltage divider 16. So also reduces the ratio of the continuous heating power to the preheating. In other words, the current strength of the Treasureitesstroms can be reduced and thereby lower Treasurefilpositione be achieved. These losses can be further reduced by means of the throttles 19, 20.
  • the frequency of the AC supply voltage U V is lowered so that the gas discharge lamps 6, 7 ignite. Due to the different capacitance values of the capacitors 16a, 16b, the ignition of the gas discharge lamps 6, 7 takes place sequentially. This means that the gas discharge lamps 6, 7 are ignited one after the other.
  • a circuit arrangement 1 which enables reliable preheating of electrodes of a series connection of at least two gas discharge lamps 6, 7.
  • the circuit arrangement 1 comes without additional cost-intensive and technically complex preheating circuits; It can be produced inexpensively and reduced component.
  • Reliable preheating of the electrodes is ensured by a capacitive voltage divider 16 including first and second capacitors 16a, 16b. It is unnecessary to use a plurality of additional windings on the resonance choke 12, it is sufficient only an additional winding 14, which can be wound without much effort and with a few turns.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (5)

  1. Agencement de circuit (1) pour faire fonctionner un montage en série d'au moins une première et une deuxième lampe à décharge basse pression (6, 7), avec
    - une entrée (2) avec une première et une deuxième borne d'entrée (3, 4) pour appliquer une tension alternative d'alimentation (Uv),
    - une sortie (8, 9, 10, 11) avec au moins un premier ensemble de bornes (8, 9) comportant une première et une deuxième paire de bornes (8, 9) pour connecter la première lampe à décharge basse pression (6), et un deuxième ensemble de bornes (10, 11) comportant une première et une deuxième paire de bornes (10, 11) pour connecter la deuxième lampe à décharge basse pression (7), une première borne (9a) de la deuxième paire de bornes (9) du premier ensemble de bornes (8, 9) étant couplée avec une première borne (10a) de la première paire de bornes (10) du deuxième ensemble de bornes (10, 11),
    - un circuit résonant avec une inductance résonante (12) couplée entre la première borne d'entrée (3) et une première borne (8a) de la première paire de bornes (8) du premier ensemble de bornes (8, 9), et un condensateur résonant (13),
    caractérisé en ce que
    le condensateur résonant (13) est monté entre la deuxième borne (8b) de la première paire de bornes (8) du premier ensemble de bornes et la deuxième borne (11b) de la deuxième paire de bornes (11) du deuxième ensemble de bornes,
    l'agencement de circuit (1) comprend en outre un diviseur de tension capacitif (16), lequel comporte un premier condensateur (16a) couplé en parallèle avec le premier ensemble de bornes (8, 9) et un deuxième condensateur (16b) couplé en parallèle avec le deuxième ensemble de bornes (10, 11),
    le premier condensateur (16a) étant monté entre la première borne (8a) de la première paire de bornes (8) et la première borne (9a) de la deuxième paire de bornes (9) du premier ensemble de bornes,
    et le deuxième condensateur (16b) étant monté entre la première borne (10a) de la première paire de bornes (10) et la première borne (11a) de la deuxième paire de bornes (11) du deuxième ensemble de bornes.
  2. Agencement de circuit (1) selon la revendication 1, caractérisé en ce que pour une fréquence de fonctionnement de la tension alternative d'alimentation (Uv) dans une plage de valeurs comprises entre environ 40 kHZ et environ 50 kHz, le premier et le deuxième condensateur (16a, 16b) présentent chacun une valeur de la capacité comprise dans une gamme de valeurs allant de 10 pF jusqu'à 5 nF, de préférence comprise entre une gamme de valeurs allant de 100 pF jusqu'à 2,5 nF.
  3. Agencement de circuit (1) selon la revendication 1 ou 2, caractérisé en ce qu'un enroulement auxiliaire (14) est enroulé sur l'inductance résonante (12), et qui est couplé avec une deuxième borne (9b) de la deuxième paire de bornes (9) du premier ensemble de bornes (8, 9) et avec une deuxième borne (10b) de la première paire de bornes (10) du deuxième ensemble de bornes (10, 11).
  4. Agencement de circuit (1) selon l'une des revendications précédentes, caractérisé en ce qu'un élément réactif (19, 20), en particulier une inductance (19, 20), est couplé entre les bornes (8a, 8b) de la première paire de bornes (8) du premier ensemble de bornes (8, 9) et/ou entre les bornes (11a, 11b) de la deuxième paire de bornes (11) du deuxième ensemble de bornes (10, 11).
  5. Procédé pour faire fonctionner un montage en série d'au moins une première et une deuxième lampe à décharge basse pression (6, 7) sur un agencement de circuit (1) avec une entrée (2) avec une première et une deuxième borne d'entrée (3, 4) pour appliquer une tension alternative d'alimentation (Uv), avec une sortie (8, 9, 10, 11) avec au moins un premier ensemble de bornes (8, 9) comportant une première et une deuxième paire de bornes (8, 9) pour connecter la première lampe à décharge basse pression (6), et un deuxième ensemble de bornes (10, 11) comportant une première et une deuxième paire de bornes (10, 11) pour connecter la deuxième lampe à décharge basse pression (7), une première borne (9a) de la deuxième paire de bornes (9) du premier ensemble de bornes (8, 9) étant couplée avec une première borne (10a) de la première paire de bornes (10) du deuxième ensemble de bornes (10, 11), avec un circuit résonant avec une inductance résonante (12) couplée entre la première borne d'entrée (3) et une première borne (8a) de la première paire de bornes (8) du premier ensemble de bornes (8, 9), et un condensateur résonant (13),
    caractérisé en ce que le condensateur résonant (13) est monté entre la deuxième borne (8b) de la première paire de bornes (8) du premier ensemble de bornes et la deuxième borne (11b) de la deuxième paire de bornes (11) du deuxième ensemble de bornes,
    une tension électrique appliquée entre la première paire de bornes (8) du premier ensemble de bornes (8, 9) et la deuxième paire de bornes (11) du deuxième ensemble de bornes (10, 11) est divisée au moyen d'un diviseur de tension capacitif (16), lequel comporte un premier condensateur (16a) couplé en parallèle avec le premier ensemble de bornes (8, 9) et un deuxième condensateur (16b) couplé en parallèle avec le deuxième ensemble de bornes (10, 11),
    le premier condensateur (16a) étant monté entre la première borne (8a) de la première paire de bornes (8) et la première borne (9a) de la deuxième paire de bornes (9) du premier ensemble de bornes,
    et le deuxième condensateur (16b) étant monté entre la première borne (10a) de la première paire de bornes (10) et la première borne (11a) de la deuxième paire de bornes (11) du deuxième ensemble de bornes.
EP10161981A 2009-05-20 2010-05-05 Agencement de commutation destiné au fonctionnement d'une commutation en série d'au moins deux lampes à décharge basse pression et procédé correspondant Not-in-force EP2257134B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009022072A DE102009022072A1 (de) 2009-05-20 2009-05-20 Schaltungsanordnung zum Betreiben einer Reihenschaltung von mindestens zwei Niederdruck-Gasentladungslampen und entsprechendes Verfahren

Publications (2)

Publication Number Publication Date
EP2257134A1 EP2257134A1 (fr) 2010-12-01
EP2257134B1 true EP2257134B1 (fr) 2012-11-21

Family

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Application Number Title Priority Date Filing Date
EP10161981A Not-in-force EP2257134B1 (fr) 2009-05-20 2010-05-05 Agencement de commutation destiné au fonctionnement d'une commutation en série d'au moins deux lampes à décharge basse pression et procédé correspondant

Country Status (5)

Country Link
US (1) US8354797B2 (fr)
EP (1) EP2257134B1 (fr)
KR (1) KR20100125193A (fr)
CN (1) CN101896031B (fr)
DE (1) DE102009022072A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081718A (en) * 1975-05-20 1978-03-28 Nec Sylvania Corporation Discharge lamp lighting device using a backswing booster
JP2810662B2 (ja) * 1987-12-23 1998-10-15 松下電工株式会社 放電灯点灯装置
DE69017940T2 (de) * 1989-04-28 1995-11-16 Philips Electronics Nv Wechselrichter zum Speisen zweier Gas und / oder Dampfentladungslampen.
DE4425859A1 (de) 1994-07-21 1996-01-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen
US6630797B2 (en) * 2001-06-18 2003-10-07 Koninklijke Philips Electronics N.V. High efficiency driver apparatus for driving a cold cathode fluorescent lamp
DE10252834A1 (de) * 2002-11-13 2004-05-27 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Vorrichtung zum Betreiben von Entladungslampen mittels eines Transformators mit vier Wicklungen und entsprechendes Verfahren

Also Published As

Publication number Publication date
EP2257134A1 (fr) 2010-12-01
CN101896031B (zh) 2014-07-09
KR20100125193A (ko) 2010-11-30
US20100295459A1 (en) 2010-11-25
CN101896031A (zh) 2010-11-24
US8354797B2 (en) 2013-01-15
DE102009022072A1 (de) 2010-11-25

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