EP1836882B1 - Elektronisches vorschaltger[t (evg) - Google Patents

Elektronisches vorschaltger[t (evg) Download PDF

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Publication number
EP1836882B1
EP1836882B1 EP05850186A EP05850186A EP1836882B1 EP 1836882 B1 EP1836882 B1 EP 1836882B1 EP 05850186 A EP05850186 A EP 05850186A EP 05850186 A EP05850186 A EP 05850186A EP 1836882 B1 EP1836882 B1 EP 1836882B1
Authority
EP
European Patent Office
Prior art keywords
transformer
lamp
electronic ballast
winding
lamp arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05850186A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1836882A1 (de
Inventor
Werner Longhino
Thomas Mudra
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 PL05850186T priority Critical patent/PL1836882T3/pl
Publication of EP1836882A1 publication Critical patent/EP1836882A1/de
Application granted granted Critical
Publication of EP1836882B1 publication Critical patent/EP1836882B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 an electronic ballast (ECG) for operating a lamp arrangement according to the preamble of patent claim 1 or 4.
  • Discharge lamps are often operated with the aid of electronic ballasts, which transform the low-frequency power supply voltage into a high-frequency AC voltage. As a result, the efficiency of the lamps is increased and a longer life is achieved.
  • the invention has for its object to provide an electronic ballast (ECG) for operating a lamp assembly, in which over conventional solutions a uniformly bright lighting of all lamps and protection against premature ignition and electric shock are made possible with the lowest possible cost.
  • ECG electronic ballast
  • the electronic ballast according to the invention for operating a lamp arrangement with at least one lamp, in particular a low-pressure discharge lamp has at least one transformer for balancing the lamp currents, wherein the transformer has two windings which are associated with one or more lamps of the lamp assembly.
  • the transformer is designed as a saturation-symmetrizing throttle. On the one hand, this inductor balances the lamp currents, so that all the lamps shine uniformly bright both in the case of a single lamp whose ends and in a series connection of several lamps, while on the other hand it limits the occurring voltages by a defined saturation of the ferromagnetic transformer core.
  • the current at which the saturation occurs is set such that a decoupling of the windings of the transformer already occurs at a voltage substantially lower than that necessary for the ignition of the lamps. Tensions that cause premature ignition during the preheat phase and thus to a Damage to the lamps will be prevented. Furthermore, voltages are prevented which lead to unintentional ignition and thus to an accident risk of electric shock to the user. As a result, it is possible to dispense with separate safety circuits, as required in conventional solutions.
  • the saturation-balancing choke is set so that the saturation of the ferromagnetic core occurs at a current in the range of 5 - 50 mA.
  • the electronic ballast comprises a series resonant circuit consisting of a coil and a capacitor.
  • the windings of the transformers preferably have the same number of turns and are arranged with opposite winding system.
  • a first winding of the transformer is arranged in front of the lamp arrangement and a second winding of the transformer according to the lamp arrangement. This ensures that the currents are balanced in front of and behind a lamp assembly consisting of one or more lamps and all the lamps of the lamp assembly or the two ends of a single lamp shine uniformly bright.
  • a first winding of the transformer is arranged in front of the lamp assembly and a second winding of the transformer after the lamp assembly.
  • the first windings of the transformers are additionally preceded in each case by a winding of a further balancing transformer. Due to the fact that the two windings of the balancing transformer have the same number of turns and are designed with opposing winding directions, the balancing transformer also works as a differential current transformer and balances the partial currents in the parallel-connected winding Current branches. This measure ensures that all lamps of the lamp assembly shine brightly even in parallel-connected current branches.
  • the electronic ballast has two parallel-connected current branches, each having at least one lamp assembly, wherein the first winding of the transformer after the first lamp assembly and the second winding of the transformer is arranged after the second lamp assembly.
  • the lamp arrangement is preceded in each case by a winding of an additional balancing transformer in the parallel-connected current branches.
  • an additional balancing transformer in the parallel-connected current branches. This works, as already explained, as a differential current transformer and symmetrizes the partial currents in the parallel-connected current branches, to ensure that all the lamps of the lamp assembly shine the same bright.
  • the series resonant circuit is preferably arranged before the parallel connection of the two current branches.
  • the first winding of the transformer is connected to the first lamp assembly and the second winding of the transformer to the second lamp assembly, wherein the lamp assembly is preceded by a separate series resonant circuit in the current branches .
  • This symmetrizes the partial currents in the parallel-connected current branches, which may differ from each other, for example due to different manufacturing tolerances of the electronic components (coils, capacitors, etc.). This ensures that the lamps in the parallel-connected current branches light up brightly.
  • the described lamp arrangement may comprise one or more lamps according to one embodiment.
  • the electronic ballast is preferably designed as an inverter, in particular as a half-bridge inverter.
  • FIGS. 1 to 4 only the load circuit of the electronic ballast according to the invention and a drive electronics 1 is shown, to which a high-frequency alternating voltage generated by a half-bridge inverter, not shown, is supplied.
  • the components of the electrical ballast which are further upstream of the load circuit, such as the input filter and the rectifier, are well known in the prior art and are therefore not explained in detail below.
  • the load circuit initially consists of a coil L1 and a capacitor C1, which form a series resonant circuit, wherein the first terminal of the resonance capacitor C1 is connected to the resonance coil L1 and the second terminal of the capacitor C1 to the ground potential.
  • the first terminal of the resonance capacitor C1 is further connected via a series and / or parallel connection of a lamp arrangement 2 with the first terminal of a half-bridge capacitor C2 and the second terminal of the half-bridge capacitor C2 to the ground potential.
  • the ballast according to the invention is used to operate a lamp assembly with at least one low-pressure discharge lamp, which are each provided with two preheatable electrode coils for generating a gas discharge. In order to enable a gentle lamp operation, the electrode coils can be acted upon by a heating device H with a heating current.
  • the electrical ballast is used to operate a single lamp LA1.
  • FIG. 1 shows the schematic circuit structure of this ballast.
  • the lamp LA1 is connected between the first terminal of the resonance capacitor C1 and the first terminal of the half-bridge capacitor C2 in the load circuit.
  • the electronic ballast has a transformer Tr1 designed as saturation-balancing choke with two windings 4a, 4b of the same number of turns and the opposite winding system.
  • the windings 4a, 4b are connected in series with the lamp LA1, magnetically coupled to one another via a ferromagnetic core and flowed in opposite directions from the lamp current.
  • the first winding 4a of the transformer Tr1 is connected in front of the lamp LA1 and the second winding 4b of the transformer Tr1 after the lamp LA1 in the load circuit of the half-bridge inverter, so that the transformer Tr1 operates as a differential current transformer and symmetrizes the lamp currents in front of and behind the lamp LA1.
  • the transformer Tr1 designed as a saturation-balancing choke assumes both the symmetrization of the lamp current necessary for uniformly bright illumination of the ends of the lamp LA1 and the limitation of the occurring voltages by a defined saturation of the ferromagnetic transformer core at a current in the range of 5 -50 mA.
  • FIG. 2 shows a schematic representation of a circuit arrangement of a suitable for operation of two parallel lamp assemblies 2 electronic ballast, wherein two parallel-connected current branches are connected to the first terminal of the resonant capacitor C1 and to the first terminal of each of a half-bridge capacitor C2, in the two connected in series Lamps LA2, LA3 and LA4, LA5 are connected.
  • a respective transformer Tr2, Tr3 is provided in each of the two current branches connected in parallel, a first winding 6a or 8a of the transformers being arranged upstream of the lamp arrangement 2 and a second winding 6b or 8b of the transformers downstream of the lamp arrangement 2 is.
  • the windings 6a, 6b and 8a, 8b are each designed with opposite sense winding at the same number of turns and form a differential current transformer, which balances the lamp currents immediately before and behind the lamp assembly 2.
  • the two transformers Tr2, Tr3 are designed as saturation-balancing chokes, which both the uniformly bright illumination of the series-connected lamps LA2, LA3 and LA4, LA5 necessary symmetrization of the lamp currents as well as the limitation of the voltages occurring by the assume defined set saturation of the ferromagnetic transformer core.
  • the first windings 6a, 8a of the transformers Tr2, Tr3 are each preceded in turn by a winding 10a, 10b of a balancing transformer Tr4, which does not operate in the saturation region.
  • This also acts as a differential current transformer and balances the partial currents in the parallel-connected current branches, so that the lamps LA2, LA3 in the first branch, even with strong dimming shine as bright as the lamps LA4, LA5 in the second branch.
  • the electric ballast is used to operate two lamp assemblies 2 in parallel current branches.
  • FIG. 3 shows the schematic circuit structure of this ballast.
  • a lamp LA6. LA7 is switched. That is, in this embodiment, the series resonant circuit is arranged before the parallel connection of the current branches.
  • a first winding 12a of the saturable-balancing transformer Tr5 is arranged after the first lamp LA6 and a second winding 12b of this transformer Tr5 after the second lamp LA7, wherein the lamps LA6, LA7 in the parallel-connected current branches each have a winding 14a or 14b a balancing transformer Tr6 is connected upstream (ie, a transformer that does not work in the saturation region).
  • a balancing transformer Tr6 is connected upstream (ie, a transformer that does not work in the saturation region).
  • saturation-balancing choke Tr5 assumes both the symmetry of the lamp currents necessary for uniformly bright illumination of the lamps and the limitation of the occurring voltages by a defined saturation of the ferromagnetic transformer core at a current in the range of 5-50 mA ,
  • FIG. 4 also shows a schematic circuit arrangement of a suitable for the operation of two parallel lamp assemblies 2 electronic ballast.
  • This variant uses two parallel-connected current branches, which are each designed with a series resonant circuit consisting of a resonance capacitor C1 and a resonance coil L1, wherein a lamp LA8, LA9 is connected to the first terminal of the resonance capacitors C1 and to the first terminal of a half-bridge capacitor C2.
  • a first winding 16a of a saturable-balancing transformer Tr7 is arranged after the first lamp LA8 and a second winding 16b of this transformer after the second lamp LA9. This symmetrizes the partial currents in the parallel-connected current branches, since these may differ from each other, for example due to different manufacturing tolerances of the capacitors and coils used.
  • the saturation-balancing choke Tr7 assumes both the symmetry of the lamp currents necessary for uniformly bright illumination of the lamps LA8, LA9 and the limitation of the occurring voltages by a defined saturation of the ferromagnetic transformer core at a current in the range of 5 to 50 mA and the associated security against inadvertent ignition of the lamp.
  • the safety regulations thumb test
  • an electronic ballast for operating a lamp assembly having at least one lamp, in particular a low-pressure discharge lamp, and at least one transformer for balancing the lamp currents, wherein the transformer has two windings, which are associated with one or more lamps of the lamp assembly.
  • the transformer is designed as a saturation-symmetrizing throttle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Glass Compositions (AREA)
  • Furan Compounds (AREA)
EP05850186A 2005-01-11 2005-12-20 Elektronisches vorschaltger[t (evg) Not-in-force EP1836882B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05850186T PL1836882T3 (pl) 2005-01-11 2005-12-20 Statecznik elektroniczny (EVG)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005001326A DE102005001326A1 (de) 2005-01-11 2005-01-11 Elektronisches Vorschaltgerät (EVG)
PCT/DE2005/002295 WO2006074629A1 (de) 2005-01-11 2005-12-20 Elektronisches vorschaltgerät (evg)

Publications (2)

Publication Number Publication Date
EP1836882A1 EP1836882A1 (de) 2007-09-26
EP1836882B1 true EP1836882B1 (de) 2008-12-03

Family

ID=35967061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05850186A Not-in-force EP1836882B1 (de) 2005-01-11 2005-12-20 Elektronisches vorschaltger[t (evg)

Country Status (8)

Country Link
US (1) US7675242B2 (zh)
EP (1) EP1836882B1 (zh)
CN (1) CN101099416B (zh)
AT (1) ATE416598T1 (zh)
CA (1) CA2594279A1 (zh)
DE (2) DE102005001326A1 (zh)
PL (1) PL1836882T3 (zh)
WO (1) WO2006074629A1 (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005060345A1 (de) * 2005-12-16 2007-06-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Betreiben mindestens einer ersten und einer zweiten Lampe
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
DE102007054805A1 (de) * 2007-11-16 2009-05-20 Tridonicatco Schweiz Ag Schaltungsanordnung zum Betreiben von Gasentladungslampen, bspw. HID-Lampen
TW200948201A (en) * 2008-02-05 2009-11-16 Microsemi Corp Arrangement suitable for driving floating CCFL based backlight
US8493052B2 (en) * 2009-05-27 2013-07-23 Articulate Labs, Inc. Apparatus and technique to drive a variable load via transformer secondary winding
DE102010010235B9 (de) * 2009-10-19 2013-04-18 Exscitron Gmbh Vorrichtung zur Ansteuerung einer Mehrzahl von LED-Strängen
EP2534746A2 (en) * 2010-02-08 2012-12-19 Koninklijke Philips Electronics N.V. Driver circuit for driving a load circuit
US9343996B2 (en) 2014-02-04 2016-05-17 Pavel Dourbal Method and system for transmitting voltage and current between a source and a load

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01189897A (ja) * 1988-01-26 1989-07-31 Tokyo Electric Co Ltd 放電灯点灯装置
ATE147926T1 (de) * 1992-09-24 1997-02-15 Knobel Lichttech Schaltungsanordnung zum betrieb einer leuchtstofflampe und zur messung des lampenstroms
DE69524593T2 (de) * 1995-09-27 2002-08-08 Koninklijke Philips Electronics N.V., Eindhoven Vorschaltgerät mit Symmetriertransformator für Leuchtstofflampen
EP0855850B1 (en) * 1997-01-27 2001-08-29 MAGNETEK S.p.A. A power supply for discharge lamps with balanced resonant circuit
DE10036952A1 (de) * 2000-07-28 2002-02-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Reduzierung der Klemmenspannung von Betriebsgeräten für Gasentladungslampen
TWI256860B (en) * 2001-06-29 2006-06-11 Hon Hai Prec Ind Co Ltd Multi-tube driving system
DE10134966A1 (de) * 2001-07-23 2003-02-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorschaltgerät zum Betrieb mindestens einer Niederdruckentladungslampe
TW595263B (en) * 2002-04-12 2004-06-21 O2Micro Inc A circuit structure for driving cold cathode fluorescent lamp
US7187139B2 (en) * 2003-09-09 2007-03-06 Microsemi Corporation Split phase inverters for CCFL backlight system

Also Published As

Publication number Publication date
WO2006074629A1 (de) 2006-07-20
PL1836882T3 (pl) 2009-06-30
ATE416598T1 (de) 2008-12-15
DE102005001326A1 (de) 2006-07-20
DE502005006178D1 (de) 2009-01-15
EP1836882A1 (de) 2007-09-26
CA2594279A1 (en) 2006-07-20
US20080106215A1 (en) 2008-05-08
CN101099416B (zh) 2011-06-22
US7675242B2 (en) 2010-03-09
CN101099416A (zh) 2008-01-02

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