EP1286572B1 - Ballast pour alimenter au moins une lampe à décharge basse-pression - Google Patents

Ballast pour alimenter au moins une lampe à décharge basse-pression Download PDF

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Publication number
EP1286572B1
EP1286572B1 EP02011284A EP02011284A EP1286572B1 EP 1286572 B1 EP1286572 B1 EP 1286572B1 EP 02011284 A EP02011284 A EP 02011284A EP 02011284 A EP02011284 A EP 02011284A EP 1286572 B1 EP1286572 B1 EP 1286572B1
Authority
EP
European Patent Office
Prior art keywords
low
ballast
pressure discharge
transformer
lamps
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
EP02011284A
Other languages
German (de)
English (en)
Other versions
EP1286572A3 (fr
EP1286572A2 (fr
Inventor
Juergen Klier
Rene Twardzik
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to EP08150534A priority Critical patent/EP1915036B1/fr
Publication of EP1286572A2 publication Critical patent/EP1286572A2/fr
Publication of EP1286572A3 publication Critical patent/EP1286572A3/fr
Application granted granted Critical
Publication of EP1286572B1 publication Critical patent/EP1286572B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B41/26—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
    • H05B41/282—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
    • H05B41/2825—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 by means of a bridge converter in the final stage
    • H05B41/2827—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 by means of a bridge converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations

Definitions

  • the invention relates to a ballast for operating at least one low-pressure discharge lamp according to the preamble of patent claim 1.
  • ballast for operating two parallel-connected low-pressure discharge lamps is disclosed on a half-bridge inverter.
  • the ballast has a transformer with two similar windings, which are each connected in one of the two lamp current branches. This transformer works as a differential current transformer. If one of the two lamps ignites earlier than the other, the ignition of the other lamp is supported by means of the transformer.
  • the US 4,574,222 discloses a circuit arrangement for operating parallel-connected discharge lamps with a transformer for balancing the currents in the parallel branches.
  • the DE 42 43 955 A1 discloses a ballast with an inverter for at least one parallel operated gas discharge lamp pair, which is associated with a balancing transformer with two oppositely acting windings.
  • the EP 0 422 594 A1 discloses a dimming device for a fluorescent lamp.
  • ballasts for operating a plurality of low-pressure discharge lamps
  • the problem often arises that the lamps shine differently brightly in dimming operation. If the lamps are arranged in different, parallel-connected current branches, this problem can be caused by different currents in the current branches. On the other hand, this problem also occurs in lamps, which - as in a series circuit of two lamps - in the same branch are arranged.
  • the ballast comprises an inverter provided with a downstream load circuit designed as a resonant circuit into which the lamps are connected, those lamps which are directly connected to the resonant circuit components often shine brighter than the downstream lamps.
  • Both transformers act as differential current transformers.
  • the first transformer ensures symmetrization of the currents in the two parallel-connected current branches, while the second transformer enforces a balancing of the total current before and after the parallel connection of the current branches.
  • the first transformer ensures that the lamps in the two branches light up brightly, while the second transformer ensures that the lamps arranged in the same branch - ie the series-connected lamps of each branch - shine the same brightly.
  • the second transformer compensates for the losses caused by parasitic capacitances. It symmetrizes in its effort to let equal currents flow in its windings, the leakage currents caused by parasitic capacitances.
  • ballast is therefore particularly well suited to the operation of four low-pressure discharge lamps, which are arranged in two parallel current branches, each with a series connection of two low-pressure discharge lamps.
  • this variant of the ballast is also suitable for operating a different number of low-pressure discharge lamps in the two parallel current branches. For example, it is possible to arrange two low-pressure discharge lamps connected in series in the first current branch and to operate only one low-pressure discharge lamp in the second current branch.
  • the ballast according to the invention is advantageously designed as an inverter with a downstream load circuit, wherein the electrical connections for the low-pressure discharge lamps or the power branches are arranged with the electrical connections for at least one low-pressure charge lamp in the load circuit to operate the lamps with a high-frequency alternating current can.
  • the operation of the lamps with a high-frequency alternating current improves the light output and allows easy brightness control of the lamps by changing the AC frequency.
  • a half-bridge inverter is used as the inverter, whose downstream load circuit is designed as a series resonant circuit.
  • the design of the load circuit as a series resonant circuit enables easy ignition of the low-pressure discharge lamps by means of the resonance peaking method.
  • the ballast has a half-bridge inverter consisting essentially of the transistors T1, T2 and a (not shown) driving device for the transistors T1, T2 and the half-bridge capacitor C2 consists.
  • the half-bridge inverter T1, T2 is supplied at its voltage inputs with a DC voltage U, which is generated in a known manner by filtering and rectification of the AC line voltage.
  • the filter and rectifier circuit of the ballast are therefore not shown in the figures and will not be further described here.
  • the inductance L1 is connected at the center tap M1 between the transistors T1, T2 of the half-bridge inverter.
  • the first terminal of the capacitor C1 is connected, while the second terminal of the capacitor C1 is connected to the ground potential.
  • the inductance L1 and the capacitor C1 form a series resonant circuit.
  • the first terminal of the resonance capacitor C1 is connected via a parallel connection of a plurality of low-pressure discharge lamps or a series connection of low-pressure discharge lamps or a combination of both with the first terminal of the half-bridge capacitor C2.
  • the second terminal of the half-bridge capacitor C2 is at ground potential.
  • Half of the supply voltage U of the half-bridge inverter is applied to the half-bridge capacitor C2.
  • the transistors T1, T2 are switched by means of the drive device in a known manner alternately with a frequency of more than 20 kHz, so that the center tap M1 is alternately connected to the ground potential and the positive potential U. Between the center tap M1 and the second terminal of the half-bridge capacitor C2 therefore flows a correspondingly high-frequency alternating current, with which the low-pressure discharge lamps are operated.
  • the ballast for operating low-pressure discharge lamps in particular of fluorescent lamps, which are each provided with two heatable electrode coils for generating a gas discharge. Each electrode coil has two electrical connections, via which the electrode coil can be acted upon by means of a (not shown) heater H in a known manner with a heating current to enable a gentle lamp operation.
  • the ballast is used to operate four low-pressure discharge lamps, in particular fluorescent lamps L40, L41, L42, L43.
  • FIG. 1 the circuit arrangement of this ballast is shown schematically.
  • the ballast has a transformer Tr40 with two windings 40a, 40b same number of turns. The first winding 40a is connected in the first branch, in series with the series connection of the low-pressure discharge lamps L40 and L41.
  • the second winding 40b is connected in the second branch, in series with the series connection of the low-pressure discharge lamps L42 and L43.
  • the two windings 40a, 40b are arranged in the current branches such that they are traversed in opposite directions by the discharge currents of the lamps or the partial currents in the current branches.
  • the transformer Tr40 acts as a differential current transformer and ensures symmetrization of the partial currents in the two parallel-connected current branches.
  • the ballast further has a second transformer Tr41 with two windings 41a, 41b of the same number of turns.
  • the first winding 41a is immediately before the parallel connection of the two current branches and the second winding 41b is arranged immediately after the parallel connection of the two current branches, so that the two windings 41a, 41b are traversed in opposite directions by the total current of the two parallel current branches.
  • the second transformer Tr41 also operates as a differential current transformer. It forces a balancing of the total current immediately before and after the parallel connection of the two current branches. The losses due to parasitic capacitances are thereby compensated, so that the lamps L41 and L43 shine as brightly as the lamps L40 and L42 even with strong dimming.
  • the ballast is used to operate three low-pressure discharge lamps, in particular fluorescent lamps L50, L51, L52.
  • FIG. 2 the circuit arrangement of this ballast is shown schematically.
  • the ballast has a transformer Tr50 with two windings 50a, 50b of the same number of turns. The first winding 50a is connected in the first branch, in series with the series connection of the low-pressure discharge lamps L50 and L51.
  • the second winding 50b is connected in the second branch, in series with the low-pressure discharge lamp L52.
  • the two windings 50a, 50b are arranged in the current branches so that they are traversed in opposite directions by the partial currents in the current branches.
  • the transformer Tr50 acts as a differential current transformer and ensures symmetrization of the partial currents in the two parallel-connected current branches.
  • the ballast further has a second transformer Tr51 with two windings 51a, 51b of the same number of turns.
  • the first winding 51 a is immediately before the parallel connection of the two current branches and the second winding 51 b is arranged immediately after the parallel connection of the two current branches, so that the two windings 51a, 51b are traversed in opposite directions by the total current of the two parallel current branches.
  • the second transformer Tr51 also works as a differential current transformer. It forces a balancing of the total current immediately before and after the parallel connection of the two current branches.
  • the invention serves the ballast for the operation of two low-pressure discharge lamps, in particular fluorescent lamps L60, L61.
  • FIG. 3 the circuit arrangement of this ballast is shown schematically.
  • the ballast has a transformer Tr60 with two windings 60a, 60b of the same number of turns. The first winding 60a is connected in the first branch, in series with the discharge path of the low-pressure discharge lamp L60.
  • the second winding 60b is connected in the second branch, in series with the discharge path of the low-pressure discharge lamp L61.
  • the two windings 60a, 60b are arranged in the current branches such that they are traversed in opposite directions by the discharge currents of the lamps or the partial currents in the current branches.
  • the transformer Tr60 acts as a differential current transformer and ensures symmetrization of the partial currents in the two parallel-connected current branches.
  • the ballast further has a second transformer Tr61 with two windings 61a, 61b of the same number of turns.
  • the first winding 61a is immediately before the parallel connection of the two current branches and the second winding 61b is arranged immediately after the parallel connection of the two current branches, so that the two windings 61a, 61b are traversed in opposite directions by the total current of the two parallel current branches.
  • the second transformer Tr61 also works as a differential current transformer. It forces a balancing of the total current immediately before and after the parallel connection of the two current branches. The losses due to parasitic capacitances are compensated by this, so that the two ends of the lamps L60 and L61 shine brightly even with strong dimming.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Claims (4)

  1. Ballast pour faire fonctionner plusieurs lampes à décharge à basse pression, dans lequel
    - le ballast a un transformateur ( Tr40 ; Tr50 ; Tr60 ) de symétrisation des courants de lampes,
    - le ballast a deux branches de courant montées en parallèle, dans lesquelles sont montées respectivement des bornes électriques pour au moins une lampe ( L40 à L43 ; L50 à L52 ; L60, L61 ) à décharge à basse pression,
    - le transformateur ( Tr40 ; Tr50 ; Tr60 ) a un premier enroulement ( 40a ; 50a ; 60a ) qui est monté dans la première branche de courant et un deuxième enroulement ( 40b ; 50b ; 60b ) ayant le même nombre de spires qui est monté dans la deuxième branche de courant en ayant le sens d'enroulement opposé,
    caractérisé en ce que
    - le ballast a un deuxième transformateur ( Tr41 ; Tr51 ; Tr61 ) de symétrisation de tout le courant juste avant et derrière le montage en parallèle des branches de courant, dans lequel
    - le deuxième transformateur ( Tr41 ; Tr51 ; Tr61 ) a un premier ( 41a ; 51a ; 61a ) et un deuxième ( 41b ; 51b ; 61b ) enroulement ayant le même nombre de spires, le premier enroulement ( 41a ; 51a ; 61a ) étant monté avant le montage en parallèle des branches de courant et le deuxième enroulement ( 41b ; 51b ; 61b ) derrière le montage en parallèle des branches de courant, et
    - le premier ( 41a ; 51a ; 61a ) et le deuxième ( 41b ; 51b ; 61b ) enroulement du deuxième transformateur ( Tr41 ; Tr51 ; Tr61 ) sont disposés de manière à ce que, lorsque des lampes ( L40 à L43 ; L50 à L52 ; L60, L61 ) à décharge à basse pression sont raccordées, elles sont parcourues en sens inverse par le courant total du montage en parallèle des branches de courant.
  2. Ballast suivant la revendication 1, caractérisé en ce que la première et la deuxième branche de courant ont respectivement des bornes électriques pour deux lampes ( L40, L41, L42, L43 ) à décharge à basse pression à monter en série.
  3. Ballast suivant la revendication 1, caractérisé en ce que la première branche de courant a des bornes électriques pour le montage en série de deux lampes ( L50, L51 ) à décharge à basse pression et la deuxième branche de courant a des bornes électriques pour une lampe ( L52 ) à décharge à basse pression.
  4. Ballast suivant l'une ou plusieurs des revendications précédentes, caractérisé en ce que le ballast est constitué en onduleurs ( T1, T2 ) ayant un circuit de charge en aval, les bornes électriques des lampes à décharge à basse pression ou les branches de courant ayant les bornes électriques pour au moins une lampe à décharge à basse pression étant montées dans le circuit de charge.
EP02011284A 2001-07-23 2002-05-22 Ballast pour alimenter au moins une lampe à décharge basse-pression Expired - Lifetime EP1286572B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08150534A EP1915036B1 (fr) 2001-07-23 2002-05-22 Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10134966A DE10134966A1 (de) 2001-07-23 2001-07-23 Vorschaltgerät zum Betrieb mindestens einer Niederdruckentladungslampe
DE10134966 2001-07-23

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP08150534A Division EP1915036B1 (fr) 2001-07-23 2002-05-22 Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension

Publications (3)

Publication Number Publication Date
EP1286572A2 EP1286572A2 (fr) 2003-02-26
EP1286572A3 EP1286572A3 (fr) 2005-01-19
EP1286572B1 true EP1286572B1 (fr) 2008-10-29

Family

ID=7692230

Family Applications (2)

Application Number Title Priority Date Filing Date
EP08150534A Expired - Lifetime EP1915036B1 (fr) 2001-07-23 2002-05-22 Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension
EP02011284A Expired - Lifetime EP1286572B1 (fr) 2001-07-23 2002-05-22 Ballast pour alimenter au moins une lampe à décharge basse-pression

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP08150534A Expired - Lifetime EP1915036B1 (fr) 2001-07-23 2002-05-22 Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension

Country Status (5)

Country Link
US (1) US6717371B2 (fr)
EP (2) EP1915036B1 (fr)
AT (2) ATE459232T1 (fr)
CA (1) CA2394409A1 (fr)
DE (3) DE10134966A1 (fr)

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DE10200022A1 (de) * 2002-01-02 2003-07-17 Philips Intellectual Property Schaltungsanordnung zum Betrieb einer oder mehrerer Lampen
US7589478B2 (en) * 2003-02-10 2009-09-15 Masakazu Ushijima Inverter circuit for discharge lamps for multi-lamp lighting and surface light source system
JP2004335443A (ja) * 2003-02-10 2004-11-25 Masakazu Ushijima 多灯点灯の放電管用インバータ回路及び面光源システム
JP2007519174A (ja) * 2003-07-04 2007-07-12 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 複数の負の動的インピーダンス負荷を動作するためのシステム
US7187139B2 (en) 2003-09-09 2007-03-06 Microsemi Corporation Split phase inverters for CCFL backlight system
ATE458382T1 (de) * 2003-10-06 2010-03-15 Microsemi Corp Stromteilungsschema und einrichtung für mehrfach- ccf-lampenbetrieb
WO2005043592A2 (fr) * 2003-10-21 2005-05-12 Microsemi Corporation Transformateurs d'equilibrage pour lampes commandees en parallele
US7265499B2 (en) * 2003-12-16 2007-09-04 Microsemi Corporation Current-mode direct-drive inverter
US7112929B2 (en) 2004-04-01 2006-09-26 Microsemi Corporation Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system
US7250731B2 (en) * 2004-04-07 2007-07-31 Microsemi Corporation Primary side current balancing scheme for multiple CCF lamp operation
US7755595B2 (en) 2004-06-07 2010-07-13 Microsemi Corporation Dual-slope brightness control for transflective displays
DE102005001326A1 (de) * 2005-01-11 2006-07-20 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektronisches Vorschaltgerät (EVG)
US7173382B2 (en) * 2005-03-31 2007-02-06 Microsemi Corporation Nested balancing topology for balancing current among multiple lamps
DE102005030114A1 (de) * 2005-06-28 2007-01-18 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Betrieb mindestens einer elektrischen Lampe und mindestens einer LED
US7242151B2 (en) * 2005-06-29 2007-07-10 Lien Chang Electronic Enterprise Co., Ltd. Multiple lamp balance transformer and drive circuit
TWI282465B (en) * 2005-10-21 2007-06-11 Innolux Display Corp Balance controlling circuit for cold cathode fluorescent lamps
WO2007138507A1 (fr) * 2006-05-31 2007-12-06 Koninklijke Philips Electronics N.V. Procédé et système pour faire fonctionner une lampe à décharge de gaz
CN101461289A (zh) * 2006-05-31 2009-06-17 皇家飞利浦电子股份有限公司 用于操作气体放电灯的方法和系统
EP2042005A2 (fr) * 2006-07-07 2009-04-01 Koninklijke Philips Electronics N.V. Circuit d'équilibrage de courant
US8120262B2 (en) * 2006-11-09 2012-02-21 O2Micro Inc Driving circuit for multi-lamps
US7592757B2 (en) * 2007-03-29 2009-09-22 Magna International Inc. System and method for dimming one or more light source
DE102007037686A1 (de) * 2007-08-09 2009-02-12 Friedrich Onno Habben Leuchtvorrichtung und Verfahren zum Bereitstellen einer Beleuchtungsanordnung
CN101365280B (zh) * 2007-08-09 2014-03-12 皇家飞利浦电子股份有限公司 灯驱动电路
WO2009070153A1 (fr) * 2007-11-26 2009-06-04 Semiconductor Components Industries, L.L.C. Procédé et structure de formation d'un système d'éclairage fluorescent
TW200939886A (en) 2008-02-05 2009-09-16 Microsemi Corp Balancing arrangement with reduced amount of balancing transformers
US8093839B2 (en) 2008-11-20 2012-01-10 Microsemi Corporation Method and apparatus for driving CCFL at low burst duty cycle rates
US20120217893A1 (en) * 2009-12-15 2012-08-30 Sharp Kabushiki Kaisha Inverter device, illumination device for display device provided with the same, and display device
US9030119B2 (en) 2010-07-19 2015-05-12 Microsemi Corporation LED string driver arrangement with non-dissipative current balancer
DE102010041632A1 (de) 2010-09-29 2012-03-29 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben mindestens zweier Halbleiterlichtquellen
DE102010041618A1 (de) 2010-09-29 2011-12-22 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben mindestens zweier Halbleiterlichtquellen
DE102010041613A1 (de) 2010-09-29 2012-03-29 Osram Ag Schaltungsanordnung zum Betreiben mindestens zweier Halbleiterlichtquellen
US8754581B2 (en) 2011-05-03 2014-06-17 Microsemi Corporation High efficiency LED driving method for odd number of LED strings
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Also Published As

Publication number Publication date
EP1286572A3 (fr) 2005-01-19
US6717371B2 (en) 2004-04-06
ATE413086T1 (de) 2008-11-15
EP1915036A1 (fr) 2008-04-23
DE50212951D1 (de) 2008-12-11
CA2394409A1 (fr) 2003-01-23
EP1915036B1 (fr) 2010-02-24
ATE459232T1 (de) 2010-03-15
EP1286572A2 (fr) 2003-02-26
DE50214247D1 (de) 2010-04-08
US20030015974A1 (en) 2003-01-23
DE10134966A1 (de) 2003-02-06

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