EP1915036B1 - Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension - Google Patents

Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension Download PDF

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Publication number
EP1915036B1
EP1915036B1 EP08150534A EP08150534A EP1915036B1 EP 1915036 B1 EP1915036 B1 EP 1915036B1 EP 08150534 A EP08150534 A EP 08150534A EP 08150534 A EP08150534 A EP 08150534A EP 1915036 B1 EP1915036 B1 EP 1915036B1
Authority
EP
European Patent Office
Prior art keywords
pressure discharge
low
transformer
lamp
winding
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
EP08150534A
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German (de)
English (en)
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EP1915036A1 (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
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Osram GmbH
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Filing date
Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP1915036A1 publication Critical patent/EP1915036A1/fr
Application granted granted Critical
Publication of EP1915036B1 publication Critical patent/EP1915036B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/282—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 EP 0 422 594 A1 discloses a dimming device for a fluorescent lamp.
  • 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 in opposite directions windings.
  • 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 connection of two lamps - are arranged in the same branch of current.
  • 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.
  • This variant of the invention is particularly well suited for the operation of three parallel-connected low-pressure discharge lamps. It is characterized by a particularly simple wiring of the lamp.
  • the two transformers act as a differential current transformer due to the opposite arrangement of their first and second windings.
  • the special turn ratio of 2: 1 between the first and second windings in both transformers ensures that all three current branches are symmetrical, since the second windings of the two transformers are traversed by the partial currents of two current branches.
  • it is ensured by the special arrangement of the windings of both transformers that on the one hand, the currents in the three current branches are balanced and on the other hand, the losses due to parasitic Capacities are compensated in each individual branch or in each individual lamp. Therefore, all three lamps shine brightly even in strong dimming.
  • 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 improved the light output and allows easy brightness control of the lamps by changing the AC frequency.
  • the 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 which consists essentially of the transistors T1, T2 and a (not shown) driving device for the transistors T1, T2 and the half-bridge capacitor C2.
  • 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 described further here.
  • the inductance L1 is connected at the center tap M1 between the transistors T1, T2 of the half-bridge inverter.
  • the inductor L1 To the inductor L1 is 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 Lampenbetried.
  • the ballast is used to operate three parallel-connected low-pressure discharge lamps, in particular fluorescent lamps L10, L11, L12
  • FIG. 1 the circuit arrangement of this ballast is shown schematically.
  • this ballast has two transformers Tr10, Tr11, each with two windings 10a, 10b, 11a, 11b.
  • the turns ratio of the windings 10a, 10b of the first transformer Tr10 is 2: 1.
  • the turns ratio of the windings 11a, 11b of the second transformer Tr11 is 2: 1.
  • the winding 10a of the transformer Tr10 is connected in the first current path, in series with the fluorescent lamp L10.
  • the second winding 10b of the transformer Tr10 is connected both in the second current path, in series with the fluorescent lamp L11, as well as in the third current path, in series with the fluorescent lamp L12.
  • the winding 10a is therefore traversed by the discharge current of the fluorescent lamp L10, while the winding 10b is traversed by the discharge currents of the fluorescent lamps L11 and L12.
  • the two windings 10a, 10b are wound in opposite directions, so that they are traversed in opposite directions by the discharge current of the lamps.
  • the first winding 11a of the transformer Tr11 is connected in the third current path, in series with the fluorescent lamp L12, while the second winding 11b is connected both in the first current path, in series with the fluorescent lamp L10, and in the second current path, in series with the fluorescent lamp L11, is switched.
  • the winding 11a is therefore traversed by the discharge current of the fluorescent lamp L12, while the winding 11b is traversed by the discharge currents of the fluorescent lamps L10 and L11.
  • the windings 11a, 11b are arranged in opposite directions, so that they are traversed in opposite directions by the discharge currents or lamp currents.
  • the first transformer Tr10 is the fluorescent lamps L10 to L12 immediately upstream
  • the second transformer Tr11 is the fluorescent lamps L10 to L12 immediately downstream. All three current paths are thus formed completely symmetrical.
  • the two transformers Tr10, Tr11 each act as differential current transformers and ensure that regardless of the dimming level, all three lamps light up the same brightly.

Landscapes

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

Claims (1)

  1. Ballast pour faire fonctionner plusieurs lampes à décharge à basse pression, le ballast ayant trois branches de courant qui sont montées en parallèle et dans lesquelles sont montées respectivement des bornes électriques pour au moins une lampe (L10, L11, L12) à décharge à basse pression,
    caractérisé en ce que
    - le ballast comporte un transformateur (Tr10) pour symétriser des courants de lampe,
    - le transformateur (Tr10) a un premier enroulement (10a) et un deuxième enroulement (10b), le premier enroulement (10a) ayant deux fois plus de spires que le deuxième enroulement (10b),
    - le ballast a un deuxième transformateur (Tr11) pour symétriser le courant de lampe, le deuxième transformateur (Tr11) ayant un premier enroulement (11a) et un deuxième enroulement (11b) et le premier enroulement (11a) a deux fois plus de spire que le deuxième enroulement (11b),
    - les enroulements (10a, 10b, 11a, 11b) des transformateurs (Tr10, Tr11) sont disposés de façon à ce que, lorsque des lampes (L10, L11, L12) à décharge à basse pression sont raccordées, les courants dans les lampes passent d'abord dans les enroulements (10a, 10b, et 11a, 11b) de l'un des deux transformateurs (Tr10 et Tr11) puis dans les lampes (L10, L11, L12) à décharge à basse pression et ensuite seulement dans les enroulements (11a, 11b et 10a, 10b) de l'autre transformateur (Tr11 et Tr10),
    - le premier enroulement (10a) du premier transformateur (Tr10) est disposé de façon à ce que, lorsque des lampes (L10, L11, L12) à décharge à basse pression sont raccordées, il est traversé par le courant de la lampe (L10) à décharge à basse pression ou des lampes à décharge à basse pression montées dans la première branche de courant,
    - le deuxième enroulement (10b) du premier transformateur (Tr10) est disposé de manière à ce que, lorsque des lampes (L10, L11, L12) à décharge à basse pression sont raccordées, il est parcouru par les courants des lampes (L11, L12) à décharge à basse pression montées dans la deuxième et dans la troisième branche de courant, les deux enroulements (10a, 10b) du premier transformateur (tr10) étant enroulés en sens contraire,
    - le premier enroulement (11a) du deuxième transformateur (Tr11) est disposé de façon à ce que, lorsque des lampes (110, L11, L12) à décharge à basse pression sont raccordées, il est parcouru par le courant de la lampe (112) à décharge à basse pression ou des lampes à décharge à basse pression montées dans la troisième branche de courant,
    - le deuxième enroulement (11b) du deuxième transformateur (Tr11) est disposé de manière à ce que, lorsque des lampes (L10, L11, L12) à décharge à basse pression sont raccordées, il est parcouru par les courants des lampes (L10, L11) à décharge à basse pression montées dans la première et dans la deuxième branche de courant, les deux enroulements (11a, 11b) du deuxième transformateur (Tr11) étant enroulés en sens contraire.
EP08150534A 2001-07-23 2002-05-22 Appareil de montage destiné au fonctionnement d'au moins une lampe à décharge basse tension Expired - Lifetime EP1915036B1 (fr)

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
EP02011284A EP1286572B1 (fr) 2001-07-23 2002-05-22 Ballast pour alimenter au moins une lampe à décharge basse-pression

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP02011284.3 Division 2002-05-22
EP02011284A Division EP1286572B1 (fr) 2001-07-23 2002-05-22 Ballast pour alimenter au moins une lampe à décharge basse-pression

Publications (2)

Publication Number Publication Date
EP1915036A1 EP1915036A1 (fr) 2008-04-23
EP1915036B1 true EP1915036B1 (fr) 2010-02-24

Family

ID=7692230

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02011284A Expired - Lifetime EP1286572B1 (fr) 2001-07-23 2002-05-22 Ballast pour alimenter au moins une lampe à décharge basse-pression
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

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP02011284A Expired - Lifetime EP1286572B1 (fr) 2001-07-23 2002-05-22 Ballast pour alimenter au moins une lampe à décharge basse-pression

Country Status (5)

Country Link
US (1) US6717371B2 (fr)
EP (2) EP1286572B1 (fr)
AT (2) ATE413086T1 (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
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
US7589478B2 (en) * 2003-02-10 2009-09-15 Masakazu Ushijima Inverter circuit for discharge lamps for multi-lamp lighting and surface light source system
CN1817068A (zh) * 2003-07-04 2006-08-09 皇家飞利浦电子股份有限公司 用于操作多个负动态阻抗负载的系统
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
US7279851B2 (en) * 2003-10-21 2007-10-09 Microsemi Corporation Systems and methods for fault protection in a balancing transformer
US7187140B2 (en) * 2003-12-16 2007-03-06 Microsemi Corporation Lamp current control using profile synthesizer
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
US20100060184A1 (en) * 2006-05-31 2010-03-11 Koninklijke Philips Electronics N.V. Method and system for operating a gas discharge lamp
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
US8305002B2 (en) * 2007-11-26 2012-11-06 Semiconductor Components Industries, Llc Method and structure of forming a fluorescent lighting system
TW200948201A (en) * 2008-02-05 2009-11-16 Microsemi Corp Arrangement suitable for driving floating CCFL based backlight
US8093839B2 (en) 2008-11-20 2012-01-10 Microsemi Corporation Method and apparatus for driving CCFL at low burst duty cycle rates
WO2011074309A1 (fr) * 2009-12-15 2011-06-23 シャープ株式会社 Dispositif onduleur, dispositif d'éclairage pour écran équipé de ce dernier, et écran
WO2012012195A2 (fr) 2010-07-19 2012-01-26 Microsemi Corporation Arrangement de commande de chaîne de led avec dispositif d'équilibrage de courant sans dissipation
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
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Also Published As

Publication number Publication date
ATE459232T1 (de) 2010-03-15
EP1915036A1 (fr) 2008-04-23
US6717371B2 (en) 2004-04-06
US20030015974A1 (en) 2003-01-23
EP1286572B1 (fr) 2008-10-29
DE10134966A1 (de) 2003-02-06
CA2394409A1 (fr) 2003-01-23
DE50214247D1 (de) 2010-04-08
DE50212951D1 (de) 2008-12-11
ATE413086T1 (de) 2008-11-15
EP1286572A3 (fr) 2005-01-19
EP1286572A2 (fr) 2003-02-26

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