WO2007122559A1 - Circuit de sortie de signal de tension, ballast et dispositif d'éclairage - Google Patents

Circuit de sortie de signal de tension, ballast et dispositif d'éclairage Download PDF

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Publication number
WO2007122559A1
WO2007122559A1 PCT/IB2007/051403 IB2007051403W WO2007122559A1 WO 2007122559 A1 WO2007122559 A1 WO 2007122559A1 IB 2007051403 W IB2007051403 W IB 2007051403W WO 2007122559 A1 WO2007122559 A1 WO 2007122559A1
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WO
WIPO (PCT)
Prior art keywords
voltage
capacitor
output circuit
signal output
voltage signal
Prior art date
Application number
PCT/IB2007/051403
Other languages
English (en)
Inventor
Jianming Liu
Zhenyuan Guan
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007122559A1 publication Critical patent/WO2007122559A1/fr

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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
    • H05B41/288—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 preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • 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
    • H05B41/2821—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 single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2822—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 single-switch converter or a parallel push-pull 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
    • 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
    • H05B41/288—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 preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions

Definitions

  • the present invention relates to gas discharge lamp, in particular to a voltage signal output circuit, ballast and lighting device that may suppress electromagnetic interference.
  • Electromagnetic interference widely exists in various electronic and electric apparatuses and causes many adverse effects to the apparatuses per se and to the power network.
  • a ballast is taken as an example to illustrate this further.
  • Fig. 1 is a schematic drawing of the ballast circuit for a fluorescent lamp.
  • said circuit includes a filtering circuit 111, a rectifying circuit 112, a frequency converting circuit 113 and a voltage signal output circuit 114.
  • the mains supply is filtered by filtering circuit 111 and is then input to the rectifying circuit 112 to be rectified, the DC voltage obtained after rectification is converted into high frequency oscillation voltage through a frequency converting circuit 113 and is supplied to the output circuit 114.
  • the output circuit 114 includes a resonance unit composed of coil LI l and capacitor CI l, which forms a resonance loop together with the output of the frequency converting circuit 113, and the fluorescent lamp 12 is coupled in parallel between the two terminals of capacitor CI l.
  • Fig. 2 is a wiring diagram showing the practical application of the ballast circuit of
  • Fig. 1 As shown in Fig. 2, the alternating current from the mains supply transformer 13 is input to the ballast circuit 11 through Live L and Neutral N, the ballast circuit 11 is connected across terminals C and D of the lamp 12 respectively via wires Wi and W 2 , and point B is the high frequency AC ground point within the ballast circuit 11 , which forms a high frequency AC low impedance with the Neutral N, and capacitance C p i and C p2 are respectively the distributed capacitance of the wires Wi and W 2 to the ground.
  • Fig. 2 the alternating current from the mains supply transformer 13 is input to the ballast circuit 11 through Live L and Neutral N
  • the ballast circuit 11 is connected across terminals C and D of the lamp 12 respectively via wires Wi and W 2
  • point B is the high frequency AC ground point within the ballast circuit 11 , which forms a high frequency AC low impedance with the Neutral N
  • capacitance C p i and C p2 are respectively the distributed capacitance of the wires Wi
  • ui(t) and u 2 (t) are respectively the AC voltages to ground at the terminals C and D of the lamp
  • ii(t) is a high frequency current caused by ui(t) flowing from wire Wi through the distributed capacitance C pl to the ground
  • i 2 (t) is a high frequency current caused by u 2 (t) flowing from wire W 2 through C p2 to the ground
  • i 3 (t) is a high frequency current flowing back to the ballast circuit 11 through the ground, the mains supply transformer 13 and the Neutral N.
  • u 2 (t) approximates 0 and generally, the voltage drop on wires Wi and W 2 can be neglected, so
  • f is the operating frequency of the fluorescent lamp. Since i 3 (t) flows back to the ballast circuit 11 through the ground, the mains supply transformer 13 and the Neutral N, it causes electromagnetic interference to the electric network, so it should be suppressed.
  • An object of the present invention is to provide a voltage signal output circuit having the advantage of suppressing electromagnetic interference.
  • a voltage signal output circuit comprising: a resonance unit, for generating a first voltage and a second voltage with respect to a reference potential; a phase shift unit, coupled to the resonance unit, for adjusting the relative phase of the first voltage to the second voltage so that the polarity of the first voltage is opposite to that of the second voltage with respect to the reference potential; and an output unit, for outputting the first voltage and the second voltage.
  • said reference potential is a ground potential.
  • said resonance unit includes a coil, a first capacitor and a second capacitor
  • said phase shift unit is a transformer, the coil, a primary winding of the transformer, the first capacitor and the second capacitor are connected in series, the second capacitor is further connected in parallel to a secondary winding of the transformer, one terminal of the coil and the common connection terminal of the first capacitor, the second capacitor and the secondary winding are two input terminals of said voltage signal output circuit, the common connection terminal of the primary winding and the first capacitor and the common connection terminal of the secondary winding and the second capacitor are the same polarity terminals, and act as output terminals of said output unit for outputting said first voltage and said second voltage, respectively, and the ratio of turns of the primary winding to those of the secondary winding is 1 :1.
  • said voltage signal output circuit further comprises a third capacitor, one terminal of which is connected to the common connection terminal of said coil and said primary winding, and the other terminal of which is connected to the common connection terminal of said first capacitor, said second capacitor and said secondary winding.
  • said voltage signal output circuit further comprises a third capacitor, one terminal of which is connected to the common connection terminal of said primary winding and said first capacitor, and the other terminal of which is connected to the common connection terminal of said secondary winding and said second capacitor.
  • the capacitance value of said first capacitor is equal to that of said second capacitor.
  • said resonance unit includes a coil and a capacitor connected in series
  • said phase shift unit is a transformer
  • a primary winding of said transformer is connected in parallel with the capacitor
  • the transformer includes two secondary windings with their opposite polarity terminals connected in series
  • the pair of opposite polarity terminals connected in series are connected to the common connection terminal of the capacitor and the primary winding
  • the other pair of opposite polarity terminals are an output terminal for outputting the first voltage and an output terminal for outputting the second voltage of said output unit
  • one terminal of the coil and the common connection terminal of the capacitor and the primary winding are two input terminals of said voltage signal output circuit.
  • said resonance unit includes a coil and a capacitor
  • said phase shift unit is a transformer
  • one primary winding of the transformer is connected in series to the coil
  • the transformer includes two secondary windings with their opposite polarity terminals connected in series
  • the pair of opposite polarity terminals connected in series are connected to the primary winding
  • the other pair of opposite polarity terminals are connected respectively to the two terminals of the capacitor and act as an output terminal for outputting the first voltage and an output terminal for outputting the second voltage of the said output unit
  • one terminal of the coil and the pair of opposite polarity terminals connected in series are two input terminals of said voltage signal output circuit.
  • the ratio of turns of the two secondary windings is 1 :1.
  • Another object of the present invention is to provide a ballast having the advantage of suppressing electromagnetic interference. This object can be achieved by the following technical solution:
  • a ballast comprising a voltage signal output circuit as described above.
  • Another object of the invention is to provide a lighting device having the advantage of suppressing electromagnetic interference.
  • a lighting device comprising: at least one gas discharge lamp; and a ballast, wherein the ballast includes a voltage signal output circuit as described above, and said first voltage and said second voltage are coupled to the gas discharge lamp.
  • the voltage signal output circuit of the invention reduces the current flowing back to the power network and the electronic and electrical apparatuses through the reference potential point, thereby suppressing the electromagnetic interference caused to the power supply network and to the electronic apparatuses.
  • output circuit of the present invention has a compact structure, so it is good for reducing the cost and realizing miniaturization.
  • Fig. 1 is a schematic drawing of the ballast circuit for a fluorescent lamp.
  • Fig. 2 is a wiring diagram showing the practical application of the ballast circuit of Fig. 1.
  • Fig. 3 is a schematic drawing of the ballast circuit according to a preferred embodiment of the present invention.
  • Fig. 4 shows the analysis of the principle of the circuit as shown in Fig. 3.
  • Fig. 5 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • Fig. 6 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • Fig. 7 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • Fig. 8 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • the basic idea of the present invention is to provide voltages having opposite polarities with respect to a reference potential (e.g. the ground) on the two output terminals of the voltage signal output circuit, thus the current flowing from said two output terminals to the reference potential point will be completely or partly neutralized to reduce current flowing back to the power network and the electronic and electrical apparatuses through the reference potential point, thereby achieving the object of suppressing the electromagnetic interference.
  • a reference potential e.g. the ground
  • the circuit or element having a function of phase shift or generating phase difference is coupled to the resonance unit, so that the voltages at the two output terminals have opposite polarities.
  • ballast circuit as an example to illustrate the voltage signal output circuit of the present invention
  • the voltage signal output circuit of the present invention can also be applied to other electronic and electrical apparatuses.
  • all the following embodiments use a transformer as the phase shift unit that makes the voltages at the output terminals have opposite polarities, but the present invention does not exclude other phase shift circuits or elements.
  • the coupling in the context refers not only to the direct connection between the output terminal and the phase shift unit, but also to connection in the way of coupling by means of other elements or circuits (e.g. capacitor, coil or photoelectric coupling device, etc.). In this specification, the connection shall be interpreted in such broad sense unless special notes are given.
  • Fig. 3 is a schematic drawing of the ballast circuit according to a preferred embodiment of the present invention.
  • the ballast circuit includes a filtering circuit 311, a rectifying circuit 312, a frequency converting circuit 313 and an output circuit 314.
  • the mains supply is input to the filtering circuit 311 through Live L and Neutral N to be filtered and is then input to the rectifying circuit 312 to be rectified, the DC voltage obtained after rectification is converted into high frequency oscillation voltage by the frequency converting circuit 313 and is supplied to the output circuit 314.
  • the filtering circuit 311, rectifying circuit 312 and frequency converting circuit 313 may be various forms of circuits suitable for the ballast, for example, the filtering circuit 311 may be a ⁇ type filtering circuit, and the rectifying circuit 312 may be a half- wave rectifying circuit.
  • the output circuit of the ballast is changed. As shown in
  • the output circuit 314 includes a coil L31, capacitors C31, C32 and C33 and a transformer, wherein the coil L31, a primary winding T31-a of the transformer, the capacitors C32 and C33 are connected in series in this order, one terminal of the capacitor C31 is connected to the common connection terminal of the coil L31 and the primary winding T31-a, and the other terminal thereof is commonly connected to capacitors C32 and C33, the capacitor C33 is also connected in parallel to the secondary winding T31-b of the transformer, and the ratio of turns of the primary winding T31-a of the transformer to those of the secondary winding T31-b is 1 : 1.
  • the output terminal A of the frequency converting circuit 313 is connected to the output circuit 314 through coil L31, and the output terminal B is connected to the high frequency AC ground point within the ballast and is connected to the common connection terminal of capacitors C31, C32 and C33.
  • the common connection terminal of the primary winding T31-a and capacitor C32 is connected to terminal C of the fluorescent lamp as one output terminal of the output circuit 314, and the common connection terminal of the secondary winding T31-b and capacitor C33 is connected to terminal D of the fluorescent lamp as the other output terminal of the output circuit 314.
  • the terminals of the primary winding T31-a and the secondary winding T31-b connected thereto should be terminals of the same polarity.
  • the coil L31, the primary winding T31-a, the capacitors C31 and C32 can form an LC resonance circuit, and the coil L31, the secondary winding T31-b and the capacitor C33 can form another LC resonance circuit. They are inductively coupled to each other through the transformer.
  • the transformer When the transformer is connected to terminals C and D in the way as shown in Fig. 3, the output voltages ui(t) and u 2 (t) to ground at terminals C and D shall be made to have opposite polarities, so the transformer also acts as a phase shift unit that adjusts the relative phase between the output voltages.
  • the oscillation frequency of the frequency converting circuit 313 is close to the resonance frequency of said resonance circuit, so a high voltage difference is generated between the two terminals C and D of the fluorescent lamp, thereby igniting the fluorescent lamp; during normal operation, most of the current flow through the fluorescent lamp 32, and coil LI l functions to limit current.
  • i 4 (t) is the current flowing through the primary winding T31-a of the transformer
  • is(t) is the lamp current of the fluorescent lamp 32
  • i 6 (t) is the current flowing through capacitor C32
  • i 7 (t) is the current flowing through capacitor C33
  • ig(t) is the current in the secondary winding T31-b of the transformer
  • ui(t) and u 2 (t) are respectively the AC voltages to ground at the two terminals C and D of the lamp, i.e. they are the AC voltages across capacitors C32 and C33.
  • C32 and C33 are the values of capacitance of capacitors C32 and C33. It can be derived from formulae (5), (6) and (7) that
  • Fig. 5 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • the circuit structure of this embodiment is substantially the same as that shown in Fig. 3, and the difference therebetween mainly lies in the output circuit, so only the output circuit 514 is described with reference to Fig. 5.
  • the capacitor C31 is omitted as compared to Fig. 3, thus the LC resonance circuit originally formed of coil L31, primary winding T31-a, and capacitors C31 and C32 becomes an LC resonance circuit formed of coil L31, primary winding T31-a, and capacitor C32.
  • the output circuit 514 of Fig. 5 and the output circuit 314 of Fig. 3 are equivalent to each other as far as the circuit function of making the polarities of the output voltages at the two terminals of the lamp opposite, so the working principle thereof will not be detailed herein.
  • Fig. 6 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • the circuit structure of this embodiment is substantially the same as that shown in Fig. 3, and the difference therebetween mainly lies in the output circuit, so only the output circuit 614 is described with reference to Fig. 6.
  • one terminal of capacitor C31 ' is connected to terminal C or the common connection terminal of the primary winding T31-a and the capacitor C32, and the other terminal thereof is connected to terminal D or the common connection terminal of the secondary winding T31-b and the capacitor C33.
  • Fig. 7 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • the circuit structure of this embodiment is substantially the same as that shown in Fig. 3, and the difference therebetween mainly lies in the output circuit, so only the output circuit 714 is described with reference to Fig. 7.
  • the voltage signal output circuit 714 of the present embodiment includes a coil L71, a capacitor C71 and a transformer T2.
  • the coil L71 is connected in series to the capacitor C71, and the capacitor C71 is connected to the primary winding T2-a of the transformer T2 in parallel
  • the output terminal A of the frequency converting circuit 313 is connected to the output circuit 714 through coil L71
  • the output terminal B thereof is connected to the high frequency AC ground point within the ballast and is connected to the common connection terminal of the capacitor C71 and the primary winding T2-a.
  • the transformer T2 includes two secondary windings
  • T2-bl and T2-b2 which are connected in series to each other through one pair of opposite polarity terminals, and the other pair of opposite polarity terminals are respectively connected to terminals C and D of the fluorescent lamp as two output terminals of the output circuit 714, said pair of opposite polarity terminals that are connected in series are also connected to the common connection terminal of the capacitor C71 and the primary winding T2-a.
  • the coil L71 and the capacitor C71 can form an LC resonance circuit, the output of which is coupled to terminals C and D of the fluorescent lamp through transformer T2. Since the opposite polarity terminals of the two secondary windings T2-bl and T2-b2 are connected in series, the output voltages Ui(t) and u 2 (t) to ground at terminals C and D have opposite polarities, thus transformer T2 functions as a phase shift unit that adjusts the relative phase between the output voltages to ground.
  • Fig. 8 is a schematic drawing of the ballast circuit according to another preferred embodiment of the present invention.
  • the circuit structure of this embodiment is substantially the same as that shown in Fig. 3, and the difference therebetween mainly lies in the output circuit, so only the output circuit 814 is described with reference to Fig. 8.
  • the voltage signal output circuit 814 of the present embodiment includes a coil L71, a capacitor C71 ' and a transformer T2. As shown in Fig. 8, coil L71 is connected in series to the primary winding T2-a of transformer T2, the output terminals A and B of the frequency converting circuit 313 are connected to the output circuit 814 through the coil L71 and the primary winding T2-a, and the output terminal B is also connected to the high frequency AC ground point within the ballast.
  • the transformer T2 includes two secondary windings T2-bl and T2-b2 which are connected in series to each other through one pair of opposite polarity terminals, and the other pair of opposite polarity terminals are respectively connected to the two terminals of capacitor C71 ', and the two terminals of capacitor C71 ' are respectively connected to terminals C and D of the fluorescent lamp 32 as two output terminals of the output circuit 814.
  • the output circuit as shown in Fig. 8 is in substance an LC resonance circuit, wherein the coil L71 and capacitor C71 ' are coupled to each other through the transformer T2.
  • transformer T2 functions as a phase shift unit that adjusts the relative phase between the output voltages to ground.
  • the oscillation frequency of the frequency converting circuit 313 is close to the resonance frequency of said resonance circuit, so a high voltage difference is generated across the two terminals C and D of the fluorescent lamp, thereby igniting the fluorescent lamp; during normal operation, most of the current flow through the fluorescent lamp 32, and coil L71 functions to limit current.
  • the ratio of the turns of the two secondary windings T2-bl and T2-b2 is 1 :1, so that voltages Ui(t) and u 2 (t) at the two terminals of the lamp have opposite polarities and equal amplitude.
  • a fluorescent lamp is used as an example in the illustration above, this does not mean that this invention can only be applied to the fluorescent lamp, in fact, the above-mentioned embodiments are also suitable for various light sources that emits light directly or indirectly through discharging by gas, metal vapor or the mixed gases of various gases and vapors.
  • the above embodiments describe only the case of one tube, the present invention is also applicable to a group of gas discharge lamps consisting of at least two lamps connected in series or in parallel or in a series-parallel, and in this case, the output terminal of the voltage signal output circuit as described above could be connected to the two terminals of the group of gas discharge lamps.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Circuit de sortie de signal de tension comprenant les éléments suivants: unité de résonance générant une première et une seconde tensions par rapport à un potentiel de référence; unité de déphasage, couplée à l'unité de résonance, pour le réglage de la phase relative de la première tension par rapport à la seconde de sorte que la polarité de la première tension est opposée à celle de la seconde tension par rapport au potentiel de référence; et unité de sortie produisant les première et seconde tensions. le présent modèle d'utilité concerne également un ballast et une lampe d'éclairage utilisant le circuit de sortie. Le circuit de sortie du signal de tension du présent modèle d'utilité permet de réduire l'intensité au terminal de sortie qui retourne au réseau d'alimentation électrique et au dispositif électrique et électronique via le point de potentiel de référence, ceci en produisant des tensions de polarité inverse, ce qui supprime les interférences électromagnétique pour le réseau d'alimentation électrique et le dispositif électronique. De plus, le présent circuit de sortie offre une structure compacte, ce qui est avantageux en termes de réduction des coûts et miniaturisation.
PCT/IB2007/051403 2006-04-21 2007-04-19 Circuit de sortie de signal de tension, ballast et dispositif d'éclairage WO2007122559A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200620100079.6 2006-04-21
CNU2006201000796U CN2927599Y (zh) 2006-04-21 2006-04-21 电压信号输出电路、镇流器和照明装置

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Publication Number Publication Date
WO2007122559A1 true WO2007122559A1 (fr) 2007-11-01

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TW (1) TW200843557A (fr)
WO (1) WO2007122559A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009049674A1 (fr) * 2007-10-17 2009-04-23 Osram Gesellschaft mit beschränkter Haftung Ballast électronique et procédé pour faire fonctionner une lampe à décharge
WO2010027392A1 (fr) * 2008-09-05 2010-03-11 Lutron Electronics Co., Inc. Ballast électronique possédant une topologie de circuit résonant asymétrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI638585B (zh) * 2017-06-02 2018-10-11 興訊科技股份有限公司 低電磁干擾照明裝置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999025001A1 (fr) * 1997-11-07 1999-05-20 Koninklijke Philips Electronics N.V. Unite d'eclairage et dispositif d'affichage a cristaux liquides
EP1429585A1 (fr) * 2001-07-16 2004-06-16 Harison Toshiba Lighting Corporation Dispositif de fonctionnement d'une lampe a decharge a barriere dielectrique
EP1542347A1 (fr) * 2002-08-06 2005-06-15 Sharp Corporation Circuit inverseur, dispositif de commande de tubes fluorescents, dispositif de retroeclairage et afficheur a cristaux liquides

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999025001A1 (fr) * 1997-11-07 1999-05-20 Koninklijke Philips Electronics N.V. Unite d'eclairage et dispositif d'affichage a cristaux liquides
EP1429585A1 (fr) * 2001-07-16 2004-06-16 Harison Toshiba Lighting Corporation Dispositif de fonctionnement d'une lampe a decharge a barriere dielectrique
EP1542347A1 (fr) * 2002-08-06 2005-06-15 Sharp Corporation Circuit inverseur, dispositif de commande de tubes fluorescents, dispositif de retroeclairage et afficheur a cristaux liquides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009049674A1 (fr) * 2007-10-17 2009-04-23 Osram Gesellschaft mit beschränkter Haftung Ballast électronique et procédé pour faire fonctionner une lampe à décharge
WO2010027392A1 (fr) * 2008-09-05 2010-03-11 Lutron Electronics Co., Inc. Ballast électronique possédant une topologie de circuit résonant asymétrique
US8067902B2 (en) 2008-09-05 2011-11-29 Lutron Electronics Co., Inc. Electronic ballast having a symmetric topology

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Publication number Publication date
CN2927599Y (zh) 2007-07-25
TW200843557A (en) 2008-11-01

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