EP1705964B1 - Ballast avec gradateur - Google Patents

Ballast avec gradateur Download PDF

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Publication number
EP1705964B1
EP1705964B1 EP06004878.2A EP06004878A EP1705964B1 EP 1705964 B1 EP1705964 B1 EP 1705964B1 EP 06004878 A EP06004878 A EP 06004878A EP 1705964 B1 EP1705964 B1 EP 1705964B1
Authority
EP
European Patent Office
Prior art keywords
lamp current
lamp
brightness
envelope
electronic ballast
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.)
Ceased
Application number
EP06004878.2A
Other languages
German (de)
English (en)
Other versions
EP1705964A3 (fr
EP1705964A2 (fr
Inventor
Klaus Fischer
Josef Kreittmayr
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
Publication of EP1705964A2 publication Critical patent/EP1705964A2/fr
Publication of EP1705964A3 publication Critical patent/EP1705964A3/fr
Application granted granted Critical
Publication of EP1705964B1 publication Critical patent/EP1705964B1/fr
Ceased 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
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/04—Dimming circuit for fluorescent lamps

Definitions

  • the present invention relates to an electronic ballast with a dimming device for controlling the lamp brightness of a low-pressure discharge lamp, and to a method for controlling the lamp brightness of a low-pressure discharge lamp.
  • Electronic ballasts for operating low-pressure discharge lamps are known in many designs. Usually, they include a rectifier circuit for rectifying an AC supply and charging a capacitor, often referred to as a smoothing capacitor. The voltage applied to this capacitor DC voltage is used to power an inverter or inverter (hereinafter inverter), which operates the low-pressure discharge lamp. Basically, an inverter from a rectified AC power supply or a DC power supply generates a power supply for the lamp, which has a much higher frequency than the mains frequency. Similar devices are also known for other lamp types, for example in the form of electronic transformers for halogen lamps.
  • Dimming devices for operating electronic ballasts for controlling the brightness of low-pressure discharge lamps are known per se.
  • a known possibility of brightness control is to adjust the regulation of the amplitude of the lamp current, the lamp power and thus the lamp brightness. This can be done by approximating or removing the operating frequency of the inverter from resonant frequencies of the lamp-inverter system.
  • the document US-A1-2002 / 0060537 discloses dimming from a gas discharge lamp using different dimming strategies in three different dimming ranges.
  • the three dimming strategies are analog operation, pulsed operation and superimposition of these two modes.
  • pulse width modulation PWM is used.
  • the invention is based on the technical problem of providing an improved electronic ballast with regard to lamp brightness control.
  • the invention provides that the high-frequency lamp current is amplitude-modulated with a modulation signal and thus the average lamp current is varied.
  • the maximums of the envelopes are reduced to reduce the brightness.
  • the amplitude difference between the minima and the maxima of the envelopes of the lamp current can be constant over a certain brightness range, but need not be.
  • the shape of the modulation signal is maintained in this brightness range. It only changes the DC component of the modulation signal.
  • the minimums of the envelope of the lamp current reach a lower limit.
  • This lower limit is not undershot by the envelope.
  • the lower limit may, depending on the embodiment of the invention, assume a positive finite value or else be set to zero. Between the phases with greater amplitude of the envelope, there are thus phases in which the amplitude of the envelope of the lamp current corresponds to the value of the lower limit.
  • pulse packets The phases in which the amplitude of the envelope is greater than the value of the lower bound define "pulse packets". These are from each other separated by phases with minimum amplitude of the envelope.
  • a pulse packet corresponds to a coherent period in which the amplitude of the envelope is greater than the minimum value and consists of several high-frequency lamp current oscillations. Between the pulse packets, the amplitude of the envelope corresponds to the lower limit, so it flows with positive finite lower limit, a high-frequency lamp current. If the lower limit is set to zero, no lamp current flows.
  • the low-pressure discharge lamp When operating a low-pressure discharge lamp with periodically modulated lamp current, the low-pressure discharge lamp is operated at several operating points of the lamp voltage / lamp current characteristic, that is to say the lamp characteristic. During the lower lamp current phases, the operating point is in a steeper region of the higher voltage characteristic line, while the larger lamp current phase is the lower operating point in a flatter lower voltage characteristic line FIG. 1 rather left or rather right.
  • the inverter can no longer provide the lamp voltage continuously.
  • the operating point lies in a range of lower characteristic slope and lower burning voltages during the phases with a larger lamp current and in a range of greater characteristic slope and higher lamp voltages during the phases with smaller lamp current.
  • the low-pressure discharge lamp is periodically operated only briefly in the critical range of small lamp currents, the burning voltage increases only slightly.
  • a preferred embodiment of the invention provides that a finite minimum lamp current amplitude is not undershot, but preferably should be so small that it only facilitates a rapid subsequent increase in amplitude.
  • the envelope is limited to large values.
  • the envelope does not exceed a maximum value. Starting from low brightnesses, this means that with increasing maxima and minima of the envelope of the lamp current, the maxima first reach this upper limit and then also do not exceed the corresponding value. A further increase in brightness can be achieved by increasing the minima. Phases with the maximum value of the envelope are interrupted by minima in the envelope and their surroundings. The maximum brightness is reached when the amplitude of the envelope always assumes its maximum value corresponding to the upper limit. Basically, this is a mirror image approach in relation to the lower limit explained above.
  • the rising edge of a phase with larger lamp current amplitudes is preferably carried out relatively steeply in comparison with the corresponding falling edge.
  • a rapid reduction of the envelope of the lamp current does not correspond to the inherent dynamics of the system of inverter and low-pressure discharge lamp. Because there are still many charge carriers in the discharge space of the low-pressure discharge lamp, the burning voltage of the low-pressure discharge lamp increases only slowly and the inverter can continue to couple power into the low-pressure discharge lamp.
  • an embodiment of the invention is adapted to modulate the envelope of the lamp current sawtooth or rounded sawtooth, the rising edge is much steeper than the falling.
  • the ratio between the peak and average value of the lamp current, the crest factor, can be kept small if the amplitude amplitude of the envelope of the lamp current is adequately selected. This suggests a longer life of the low pressure discharge lamp and inverter system.
  • an embodiment of the invention comprises a signal generator for generating a periodic signal and a circuit arrangement for limiting the periodic signal.
  • the limited periodic signal is used as a reference for controlling the modulation of the lamp current.
  • the signal is limited by a lower bound and possibly an upper bound.
  • the frequency response and the amplitude of the signal generated by the signal generator should preferably be able to be adapted to the particular embodiment of the invention. For example, it may be useful to make the frequency of the signal generated by the signal generator of the work area, ie the average lamp current dependent. For small lamp currents, it may be useful, for example, to increase the frequency of the sequence of maxima and minima of the envelope of the lamp current in order to give the charge carriers present in the discharge less time for recombination, even at a lower charge carrier density.
  • the output signal of the signal generator is synchronized with the phase position of the low-frequency, for example, as a result of rectification of a mains voltage supply voltage of the inverter. In this way, any beats noticeable as flickering of the lamp brightness can be avoided.
  • a preferred embodiment of the invention provides to control the inverter via a control loop.
  • the invention has a measuring device which measures the lamp current and converts it into a controlled variable.
  • this measuring device may also measure the operating frequency of the inverter or another variable related to the lamp current to convert it to a controlled variable.
  • a controller is provided. The controller receives the controlled variable of the measuring device and a signal, which is related to the desired brightness, as an input signal (reference variable). From control variable and reference variable, the output signal of the controller determines the control of the inverter.
  • a further preferred embodiment of the invention provides a circuit arrangement for measuring the lamp resistance, for example in EP 0 422 255 B1 described.
  • the measured variable is converted into a controlled variable, for example a voltage signal, and serves as an additional input to the regulator.
  • the controller can control the inverter so that a tearing of the gas discharge by increasing the lamp current is prevented.
  • the invention can make do without additional power components in the load circuit, compact can be built if required. Therefore, the invention is preferably suitable for integration of the electronic ballast in low-pressure discharge lamps, in particular compact fluorescent lamps (CFL).
  • CFL compact fluorescent lamps
  • FIG. 1 the lamp voltage of a low-pressure discharge lamp according to the invention is shown as a function of the lamp current, ie the lamp characteristic.
  • the lamp voltage initially increases only moderately from a minimum at maximum lamp current when the lamp current is reduced; the dependence of the lamp voltage on the lamp current is low: brightness range 1 in FIG. 1 , With a further reduction of the lamp current, the lamp voltage increases more and more; the dependence of the lamp voltage on the lamp current is increasing more pronounced: brightness ranges 2 and 3 in FIG. 1 ,
  • the gas discharge breaks down when the required voltage from the inverter can not be continuously supplied.
  • the limited output voltage of the inverter thus defines the minimum lamp current at which the lamp can still be operated continuously, and thus the minimum brightness of the lamp at unmodulated lamp current.
  • the entire brightness range is subdivided into three brightness ranges.
  • the lamp current is modulated in a sawtooth manner as the brightness decreases, wherein the amplitude of the sawtooth-shaped modulation increases with decreasing brightness and the maxima of the sawtooth are "cut off" by an upper limit.
  • FIG. 2 a shows the lamp current just below the maximum brightness
  • FIG. 2 b shows the lamp current at a lower brightness than FIG. 2 a. It can be seen that the amplitude deviation of the sawtooth-shaped modulation changes.
  • the brightness is further reduced in a second range.
  • the amplitude deviation of the saw-tooth modulation is not changed, but the DC component of the modulation and the effective value of the lamp current continue to decrease by reducing the maximum lamp current amplitude, such as FIGS. 2 c and 2 d demonstrate.
  • FIG. 2 c shows the lamp current just at the border to the first brightness range
  • FIG. 2 d shows the lamp current at a lower brightness than FIG. 2 c.
  • the second brightness range is followed by a third brightness range. This extends to the minimum brightness.
  • the maximum amplitude of the lamp current is further reduced, decreasing the stroke of the sawtooth modulation and cutting off the sawtooth at values below the lower limit.
  • the lamp current amplitudes assume a presettable minimum value (MIN).
  • MIN minimum value
  • the envelope of the lamp current assumes a pulsed shape.
  • Each phase in which the amplitude of the envelope takes a value greater than the minimum value (MIN) defines a pulse packet. The further the maximum current amplitude and thus the stroke is reduced, the longer are the times with the minimum lamp current amplitudes.
  • the minimum lamp current amplitudes can be very small and even identical to zero, so that no or almost no lamp current flows. As the brightness decreases, the amplitudes in the pulse packets become smaller, the pulse packet durations less, and the distances between the pulse packets larger. The frequency of the modulation signal can increase.
  • FIG. 2 e shows the lamp current at a brightness close to the boundary to the second brightness range
  • Figure 2 f shows the lamp current at a lower brightness.
  • FIG. 3 shows a circuit arrangement according to the invention for controlling the lamp brightness.
  • a first signal DL is used, which behaves strictly monotone to the desired brightness.
  • This signal is fed to a sawtooth generator STG.
  • the sawtooth generator STG can be designed as a self-oscillating circuit.
  • the signal DL determines the DC component of the sawtooth signal, for example, DL can be proportional to the DC component of the sawtooth signal.
  • the sawtooth generator generates a signal ST, which is supplied to a clamping circuit.
  • the clamping circuit CL provides an output signal RV which is limited up and down. If ST assumes values which are greater than the value MAX, the output signal RV is limited to the value MAX (clamped). If ST assumes values smaller than MIN, RV is limited to MIN (clamped).
  • the original signal ST can also be completely above the value MAX or below the value MIN. In these cases, the output RV of the clamping circuit CL corresponds to a constant signal with the value MAX or MIN.
  • the clamped sawtooth signal RV is fed as a reference variable to a regulator REG.
  • the regulator REG can be implemented as a PI controller.
  • the regulator REG controls via its output signal MV, the operating frequency of the inverter INV, which operates the low-pressure discharge lamp. Further, the inverter INV provides a size CV which depends on the lamp current. The size CV may in particular be the lamp current itself or the operating frequency of the inverter.
  • the measuring device ME generated from the size CV, a signal AV, which is supplied to the regulator REG as a controlled variable.
  • the minimum value of the reference variable RV for the regulator REG corresponds to the value MIN.
  • the value MIN should preferably not be too small from a control engineering point of view.
  • the REG regulator should always be held in an active operating state instead of allowing its output signal to drop (rise) to a final value due to the supply voltage of the REG regulator. As a result, larger transient events can be avoided with increasing (falling) edge of the sawtooth-shaped modulation signal.
  • the Figures 4 af show the change of the sawtooth signal ST and the reference variable RV for driving the regulator REG with a change in the desired brightness from just below the maximum brightness to a low brightness.
  • a large part of the sawtooth signal is above the maximum value MAX.
  • Those Parts of the sawtooth signal which are above the value MAX are clamped to the value MAX.
  • the clamping device CL generates the reference variable RV, which largely corresponds to the maximum value MAX.
  • the reference variable RV corresponds to the signal ST, such as FIG. 4 a shows.
  • the desired brightness is reduced, so does the DC component of the sawtooth voltage ST.
  • the stroke of the amplitude modulation of the controlled variable RV increases, but only up to a maximum value which corresponds to the stroke of the sawtooth signal ST, such as FIG. 4 b shows.
  • phase MIN As the brightness decreases further, phases occur in which the sawtooth signal ST drops below the minimum value for the reference variable RV defined by the value MIN. During these phases, the reference variable RV is clamped by the clamping circuit CL to the minimum value MIN. The phases with decreasing DC component of the sawtooth signal ST become longer, like the FIGS. 4 e and f demonstrate. If the sawtooth signal ST is always smaller than the value MIN, the reference variable RV corresponds to the value MIN.
  • the inverter when the inverter is supplied with an intermediate circuit voltage, it will not be constant in time, but will have corresponding fluctuations in the periodicity of the supply network.
  • the frequency of the modulation signal is much larger. This can cause beats, which can be perceived as flickering of the low-pressure discharge lamp.
  • the phase angle of the sawtooth signal can be synchronized with the phase position of the line frequency. For example, it can be achieved by a suitable circuit that a rising edge of the sawtooth signal is always generated at the time of the network maximum.
  • the size of the MIN signal should be kept as small as possible in order to achieve the lowest possible brightness. With a small signal DL or MIN increases the risk of extinguishing the discharge. To prevent that from happening EP 0 422 255 B1 known circuit can be used to measure the discharge resistance. If this increases strongly, a demolition of the discharge is imminent. Based on the knowledge of the discharge resistance, the regulator REG can be supplied with an additional controlled variable, so that the lamp current is increased in the event of an imminent extinction of the lamp.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Claims (12)

  1. Ballast électronique avec variateur pour commander la luminosité d'une lampe à décharge basse pression, conçu pour fonctionner avec un courant de lampe modulé périodiquement, caractérisé en ce que le variateur est conçu pour régler le courant de lampe pour la commande de la luminosité de la lampe de la manière suivante :
    - en cas de baisse de la luminosité, les maxima et les minima de l'enveloppante du courant de lampe diminuent ;
    - si la luminosité continue de baisser, la modulation périodique de l'enveloppante du courant de lampe est superposée par une limite inférieure (MIN), au besoin égale à zéro, de l'amplitude du courant de lampe, de façon à avoir une modulation périodique de l'enveloppante du courant de lampe en paquets d'impulsions de courant de lampe avec des amplitudes du courant de lampe au-dessus de la limite inférieure (MIN),
    - étant précisé que si la luminosité continue de baisser, les largeurs des paquets d'impulsions diminuent et les intervalles entre les paquets d'impulsions, l'amplitude de l'enveloppante correspondant à la limite inférieure (MIN) dans les intervalles, augmentent.
  2. Ballast électronique selon la revendication 1, dans lequel le variateur est conçu pour que la limite inférieure (MIN) corresponde à une valeur positive de l'enveloppante du courant de lampe.
  3. Ballast électronique selon la revendication 1 ou 2, dans lequel le variateur est conçu pour que l'enveloppante du courant de lampe soit limitée en cas de luminosité intense et maximale par une valeur maximale (MAX).
  4. Ballast électronique selon la revendication 1, 2 ou 3, dans lequel le variateur est conçu pour que les flancs ascendants de la modulation périodique, par rapport aux flancs descendants, soient en pente raide.
  5. Ballast électronique selon la revendication 4, dans lequel le variateur est conçu pour moduler l'enveloppante du courant de lampe pour la commande de la luminosité en forme de dents de scie ou en forme de dents de scie arrondies.
  6. Ballast électronique selon l'une des revendications précédentes, dans lequel le variateur comporte un générateur de signal (STG) destiné à générer un signal périodique (ST) pour la modulation du courant de lampe, et un agencement de circuit (CL) pour limiter le signal périodique (ST) selon éventuellement une limite maximale et la limite minimale (MAX, MIN).
  7. Ballast électronique selon l'une des revendications précédentes, dans lequel le variateur comporte un générateur de signal (STG) destiné à générer un signal périodique (ST) pour la modulation du courant de lampe, et un dispositif de synchronisation du signal périodique avec la tension d'alimentation d'un inverseur (INV) destiné à générer le courant de lampe, le signal de sortie du générateur de signal (STG) étant synchronisé avec la position de phase de la tension d'alimentation, variant à basse fréquence, de l'inverseur (INV).
  8. Ballast électronique selon l'une des revendications précédentes, avec
    - un inverseur (INV) pour générer le courant de lampe,
    - un dispositif de mesure (ME) pour mesurer le courant de lampe ou une grandeur dépendante du courant de lampe et pour générer une grandeur réglée (AV),
    - un régulateur (REG), commandé par le variateur, pour la commande de l'inverseur (INV).
  9. Ballast électronique selon la revendication 8 avec un moyen qui est destiné à empêcher la rupture de la décharge gazeuse et qui est conçu pour mesurer la résistance de lampe et pour transformer la résistance de lampe en une grandeur réglée supplémentaire.
  10. Lampe à décharge basse pression avec un ballast électronique intégré selon l'une des revendications précédentes.
  11. Procédé pour commander la luminosité d'une lampe à décharge basse pression au moyen d'un ballast électronique avec variateur conçu pour fonctionner avec un courant de lampe modulé périodiquement, caractérisé en ce que le variateur de lumière règle le courant de lampe pour la commande de la luminosité de la lampe de la manière suivante :
    - en cas de baisse de la luminosité, les maxima et les minima de l'enveloppante du courant de lampe diminuent ;
    - si la luminosité continue de baisser, la modulation périodique de l'enveloppante du courant de lampe est superposée par une limite inférieure (MIN), au besoin égale à zéro, de l'amplitude du courant de lampe, de façon à avoir une modulation périodique de l'enveloppante du courant de lampe en paquets d'impulsions de courant de lampe avec des amplitudes du courant de lampe au-dessus de la limite inférieure (MIN),
    - étant précisé que si la luminosité continue de baisser, les largeurs des paquets d'impulsions diminuent et les intervalles entre les paquets d'impulsions, l'amplitude de l'enveloppante correspondant à la limite inférieure (MIN) dans les intervalles, augmentent.
  12. Procédé selon la revendication 11 utilisant un ballast selon l'une des revendications 1 à 10.
EP06004878.2A 2005-03-22 2006-03-09 Ballast avec gradateur Ceased EP1705964B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005013309A DE102005013309A1 (de) 2005-03-22 2005-03-22 Vorschaltgerät mit Dimmvorrichtung

Publications (3)

Publication Number Publication Date
EP1705964A2 EP1705964A2 (fr) 2006-09-27
EP1705964A3 EP1705964A3 (fr) 2010-01-27
EP1705964B1 true EP1705964B1 (fr) 2013-11-06

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Application Number Title Priority Date Filing Date
EP06004878.2A Ceased EP1705964B1 (fr) 2005-03-22 2006-03-09 Ballast avec gradateur

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US (1) US7327099B2 (fr)
EP (1) EP1705964B1 (fr)
CN (1) CN1849030B (fr)
DE (1) DE102005013309A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2482639C2 (ru) 2007-12-14 2013-05-20 Конинклейке Филипс Электроникс Н.В. Регулируемое светогенерирующее устройство
DE102009047289A1 (de) * 2009-11-30 2011-06-22 Osram Gesellschaft mit beschränkter Haftung, 81543 Verfahren zur Einstellung eines elektronischen Vorschaltgeräts, elektronisches Vorschaltgerät und Abgleicheinheit

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Publication number Priority date Publication date Assignee Title
ES2049790T3 (es) 1989-10-09 1994-05-01 Siemens Ag Adaptador electronico.
DE3943350A1 (de) 1989-12-29 1991-07-04 Zumtobel Ag Verfahren und vorschaltgeraet zum dimmen von leuchtstoffroehren
NL9000202A (nl) * 1990-01-29 1991-08-16 Philips Nv Schakelinrichting.
GB2277415B (en) * 1993-04-23 1997-12-03 Matsushita Electric Works Ltd Discharge lamp lighting device
US5684367A (en) * 1996-01-16 1997-11-04 Osram Sylvania Inc. Color control and arc stabilization for high-intensity, discharge lamps
JP3600976B2 (ja) * 1998-07-14 2004-12-15 三菱電機株式会社 放電灯点灯装置
US6198234B1 (en) * 1999-06-09 2001-03-06 Linfinity Microelectronics Dimmable backlight system
US6198236B1 (en) * 1999-07-23 2001-03-06 Linear Technology Corporation Methods and apparatus for controlling the intensity of a fluorescent lamp
US6307765B1 (en) * 2000-06-22 2001-10-23 Linfinity Microelectronics Method and apparatus for controlling minimum brightness of a fluorescent lamp
KR100345965B1 (ko) * 2000-09-15 2002-08-01 페어차일드코리아반도체 주식회사 복합 디밍 회로
JP4259008B2 (ja) * 2001-03-05 2009-04-30 東芝ライテック株式会社 電球形蛍光ランプ
EP1410695B1 (fr) * 2001-05-08 2006-06-14 Koninklijke Philips Electronics N.V. Modulation de largeur d'impulsion pour le fonctionnement de lampes haute pression
WO2002098186A1 (fr) * 2001-05-25 2002-12-05 Matsushita Electric Works, Ltd. Ballast electronique pour lampe a decharge a haute intensite
US7116063B2 (en) * 2003-07-28 2006-10-03 Matsushita Electric Works, Ltd. Dimmable discharge lamp lighting device

Also Published As

Publication number Publication date
US20060214605A1 (en) 2006-09-28
CN1849030A (zh) 2006-10-18
CN1849030B (zh) 2011-05-25
EP1705964A3 (fr) 2010-01-27
DE102005013309A1 (de) 2006-09-28
EP1705964A2 (fr) 2006-09-27
US7327099B2 (en) 2008-02-05

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