EP1377135B1 - Circuit muni d'une détection d'approche de fonctionnement en mode capacitif pour alimenter une lampe à décharge - Google Patents

Circuit muni d'une détection d'approche de fonctionnement en mode capacitif pour alimenter une lampe à décharge Download PDF

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Publication number
EP1377135B1
EP1377135B1 EP03012453A EP03012453A EP1377135B1 EP 1377135 B1 EP1377135 B1 EP 1377135B1 EP 03012453 A EP03012453 A EP 03012453A EP 03012453 A EP03012453 A EP 03012453A EP 1377135 B1 EP1377135 B1 EP 1377135B1
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EP
European Patent Office
Prior art keywords
circuit
lamp
operating
regulation
current
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
EP03012453A
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German (de)
English (en)
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EP1377135A3 (fr
EP1377135A2 (fr
Inventor
Olaf Busse
Markus Heckmann
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
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Publication of EP1377135A3 publication Critical patent/EP1377135A3/fr
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Publication of EP1377135B1 publication Critical patent/EP1377135B1/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
    • H05B41/295—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
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2986—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
    • 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
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Definitions

  • the invention relates to an operating circuit for discharge lamps.
  • the invention refers to operating circuits that supply the discharge lamp with a high-frequency power supply, which is obtained via an oscillator circuit from a power supply.
  • the invention relates to the case where the power supply to the oscillator circuit is due to an AC power supply being rectified.
  • Such operating circuits are commonplace, especially in low-pressure discharge lamps, and therefore need not be explained in detail.
  • the oscillator circuit supplies a so-called load circuit, in which the discharge lamp is connected, and which is traversed by a high-frequency lamp current generated by the oscillator circuit.
  • the load circuit defines a resonant frequency that is influenced by various electrical parameters of the load circuit and, among other things, also depends on the operating state of the discharge lamp. Efforts are made to operate the load circuit in continuous operation of the discharge lamp relatively close to the resonant frequency. This has the advantage of low phase shifts between current and voltage and thus low reactive currents. This benefits in the component dimensioning, in particular a lamp choke.
  • the oscillator circuit generating the high-frequency power supply regularly includes switching elements. At low phase shifts due to a resonance-near operation, the switching losses in the switching elements are relatively small. This has advantages in terms of the efficiency of the operating circuit as well as the thermal load and the dimensioning of the switching elements.
  • the operating circuits can not easily be relatively accurate set to a resonance-near operation. Rather, for safety reasons, a relatively large distance from the nominal resonant frequency is maintained, which takes into account the listed variations and tolerances. This results in higher component costs and increased space requirements due to correspondingly larger dimensions and efficiency losses.
  • the comparison takes place at a turn-off edge of a switching transistor of a half-bridge oscillator circuit.
  • the invention is based on the technical problem of further improving an operating circuit for a discharge lamp having an oscillator circuit and a detection circuit for detecting the proximity to a capacitive operation of the load circuit.
  • the invention relates to an operating circuit of the type shown, wherein the detection circuit detects the height of the variations of the power supply corresponding fluctuations of the lamp current or a manipulated variable of a lamp control circuit.
  • the invention is characterized by a particularly favorable form of recognition of proximity to the capacitive operation by the detection circuit.
  • the detection circuit detects in a variant of the invention, the height of fluctuations of the lamp current corresponding to the frequency of the power supply.
  • the oscillator circuit is supplied with a rectified AC power supply
  • the supply power of the oscillator circuit varies with the variations of the rectified supply voltage (so-called DC link voltage) due to the AC frequency.
  • the DC link voltage is thus modulated at twice the frequency of the original AC voltage.
  • the doubling of the frequency is a consequence of the rectification. It is also theoretically conceivable that no frequency doubling occurs here; In any case, the modulation of the intermediate circuit voltage is related to the frequency of the original AC voltage.
  • This DC link voltage modulation is usually still measurable in the lamp current itself, even if the lamp current is determined by a current or power control circuit, which forms a preferred embodiment of the invention. Control circuits are limited depending on the technical complexity in a position to attenuate this modulation. If no control circuit is provided, the modulation of the DC link voltage is more noticeable in the lamp current.
  • the rectified AC power supply is converted by a PFC circuit (Power Factor Correction, so-called power factor correction) to a substantially constant DC voltage.
  • the PFC circuit serves to limit the harmonic content of the power consumption from the AC voltage network and usually charges a storage capacitor to the intermediate circuit DC voltage.
  • the DC link voltage is then modulated to some extent according to the AC voltage frequency.
  • the magnitude of the lamp current variations depends on the proximity to the resonant frequency and hence the proximity to the capacitive operation. This follows from the increase of the lamp current with increasing resonance proximity on the one hand and the modulation of the resonance proximity by the intermediate circuit voltage modulation on the other hand.
  • the level of fluctuations in the lamp current provides a particularly simple way of detecting proximity to capacitive operation.
  • this is a variable signal, for example, with the double mains frequency of the AC voltage network, which does not offer any significant metrological difficulties.
  • the conventional solutions for detecting the proximity to the capacitive operation associated with the operating frequency of the oscillator circuit itself and must be related to these phases which requires a considerably higher circuit complexity.
  • the lamp current must in many cases be measured for other reasons, for example in order not to exceed certain maximum values for safety reasons or to carry out the already mentioned current regulation. Then the invention is associated with a lower additional effort.
  • variable supply In the general wording of the invention in claim 1 and claim 2 is referred to by a variable supply.
  • This can, as stated above, be a rectified AC power supply on the one hand.
  • the invention also includes the case that the operating circuit is operated on a DC voltage source. Then eliminates the need for a rectifier or an already provided rectifier is ineffective.
  • the DC voltage or DC link voltage can be deliberately modulated.
  • this also has the advantage that as a result of the modulation results in a widening of the frequency spectrum of transmitted by the operating circuit to the DC voltage source high-frequency interference.
  • variable utility services in the sense of the claims can therefore also be consciously modulated DC supply services.
  • the invention also contemplates combination operating circuits which are intended for operation both on DC and AC sources.
  • the invention is directed alternatively to a detection of the height of the fluctuations of the lamp current even to the case that the lamp current is determined by a control circuit for controlling the load circuit, ie in particular the lamp current or the lamp power, in which case a manipulated variable of the control circuit, So the changes in the control circuit in the effort of the control circuit to keep the controlled variable, is detected.
  • the manipulated variable could then be understood as an illustration of the lamp current fluctuations, even if the latter does not occur or only to a small extent.
  • the control circuit preferably has an I-control element, that is to say an integrating element, in order to compensate for the comparatively slow parameter changes in the discharge lamp in the sense of the described impedance changes due to aging or other long-term fluctuations.
  • I-control element that is to say an integrating element
  • P-control element proportional element
  • another additional device for better consideration of the intermediate circuit voltage modulation.
  • control circuit and the rest of the control of the oscillator circuit can be effected by an integrated digital circuit, which only has to have a few additional functions.
  • digital circuit may be a programmable circuit or a so-called microcontroller, wherein the additional effort required for the invention may be limited to a mere software supplement.
  • Such a digital control circuit or such a microcontroller can in particular in addition to the control of the oscillator circuit and the control of the mentioned PFC circuit take over.
  • the operating circuit in the detection of a certain proximity to the capacitive operation is not, as in the prior art, switched off, but at least as a rule continues to operate.
  • the recognition of the proximity to the capacitive operation should thus lead to an influence on the mode of operation, so that this proximity is at least not further amplified or even reduced in order to be able to continue the operation.
  • the operating frequency of the oscillator circuit could be directly influenced.
  • the preferred solution in the case of a control circuit is to reduce the current setpoint or power setpoint of the current control circuit, which can have an indirect influence on the frequency.
  • the Operating circuit according to the invention thus designed to not approach too close to the capacitive operation in continuous operation and to counteract a further approximation when too close, but to continue the lamp operation. For this purpose, it is tolerated in particular to possibly change fixed parameters, such as the operating frequency or the lamp current, if necessary. In fact, from the point of view of the invention, it is more tolerable for the discharge lamp to become slightly darker in such cases than completely switched off.
  • the detection circuit compares the magnitude of the fluctuations with a predetermined threshold value and, as long as the threshold value is not exceeded, does not further influence the operation. If the threshold value is exceeded, the detection circuit can continuously change the operating frequency, the control setpoint value or another variable either in accordance with a control relationship or also change it by a predetermined fixed value, as shown in the exemplary embodiment. In any case, the comparison with the threshold value preferably gives a function of the detection circuit which normally does not influence the operation.
  • Figure 1 shows a schematic representation of a control device according to the invention
  • FIG. 2 a schematically shows the relationship between the intermediate circuit voltage, the discharge lamp current and the qualitative current form in switching elements of an oscillator circuit in an operating circuit according to the invention
  • FIG. 2b corresponds to FIG. 2a, but relates to a resonance-near operating state
  • FIG. 3 shows a block diagram of a program sequence in a control circuit of the operating circuit from FIG. 1.
  • reference numeral 1 denotes a low-pressure discharge lamp with two filament electrodes 2 and 3.
  • a ground terminal 4 and a DC link supply voltage 5 is a known per se oscillator half-bridge circuit with two switching transistors 6 and 7.
  • a high-frequency supply voltage for the discharge lamp 1 can be generated from the voltage applied to the terminal 5 rectified DC link supply voltage, which is obtained via a known rectifier bridge circuit with a PFC circuit from a mains voltage.
  • the PFC circuit which is not shown in FIG. 1, may be a so-called boost converter whose structure is known per se and is not of particular interest to the invention. It can also be another PFC circuit. However, despite PFC circuit remains a certain residual modulation of the intermediate circuit voltage with twice the mains frequency, usually at 100 Hz.
  • a so-called coupling capacitor 9 serves to decouple the discharge lamp 1 from DC components;
  • the lamp inductor 10 is used in particular to compensate for the locally negative derivation of the current-voltage characteristic of the discharge lamp 1.
  • the operating circuit is completely conventional.
  • the control terminals of the switching transistors 6 and 7, as indicated by dashed lines in Figure 1 controlled by control signals from a digital control circuit 12.
  • the digital control circuit 12 is a programmable microcontroller and detects via a measuring resistor 13 a signal indicating the magnitude of the current through the lamp inductor 10 signal.
  • control circuit 12 includes a current control circuit which controls the lamp current picked off via the resistor 13 to a substantially constant value I lamp .
  • the mode of operation of the control circuit 12 is shown in more detail in FIG.
  • the control circuit 12 can therefore measure the lamp current I Lamp via the measuring resistor 13, furthermore regulates the operating frequency of the half-bridge oscillator with the switching transistors 6 and 7 to a constant Lamp current and, finally, by evaluating the remaining modulation of the lamp current amplitude as a result of the modulation of the DC link voltage is able to detect an operation lying too close to a capacitive operation.
  • a threshold value is used for the difference between the lamp current amplitude maximum I max and minimum I min shown in FIGS. 2 a and 2 b.
  • FIGS. 2 a and 2 b schematically show the qualitative form of the fluctuations mentioned for a resonance-related but favorable operating state shown in FIG. 2 a and an unfavorable operating state shown in FIG. 2 b.
  • the lamp current is shown with its envelope, which illustrates the variations of the amplitude with the intermediate circuit voltage U zw .
  • the lamp current I Lamp oscillates at the operating frequency of the half-bridge oscillator circuit, which is indicated only schematically in FIGS. 2a and 2b.
  • FIG. 3 shows, in the form of a block diagram, the mode of operation of the operating circuit from FIG. 1.
  • the illustrated sequence runs as software stored in the microcontroller 12.
  • a measured intermediate circuit voltage (between the points 4 and 5 in FIG. 1) Uzw is subtracted from a desired intermediate value voltage U ZW target .
  • the difference is integrated via an integration element symbolized with I, multiplied by a normalization constant designated by k 3 , and used to control the PFC circuit (not shown in FIG. 1) to a constant output voltage.
  • the switching operations of a switching transistor of the PFC circuit such as a boost converter, clocked accordingly, ie ultimately changed the operating frequency of the switching transistor so that the output voltage and thus the intermediate circuit voltage U zw is as constant as possible.
  • This intermediate circuit voltage outputs the PFC circuit via the points 4 and 5 in FIG. 1 to the half-bridge oscillator formed by the switching transistors 6 and 7 and the load circuit containing the lamp 1.
  • the half-bridge oscillator with the switching transistors 6 and 7 supplies the current flowing through the lamp 1 lamp current I lamp, which is measured via the sensing resistor 13 by the microcontroller 12th This is symbolized by the arrow emerging from the half-bridge oscillator in FIG. 3 to the right.
  • the lamp current is rectified and amplified by the elements labeled with the corresponding electrotechnical switching symbols, then in a designated PT 1 Low-pass filter in the sense of averaging filtered and finally ADkonelt.
  • This detection circuit calculates the fluctuations of the lamp current amplitude over a period of 10 ms, i. the difference between the maximum and the minimum of the lamp current amplitude or the envelope within the said period. If this difference exceeds a value of, for example, 50 mA, the detection circuit increases its output signal, otherwise it lowers it. The detection circuit thus assumes that in the normal case no output signal is necessary and in this normal case has the output signal 0 (which is also not further reduced). If the threshold of 50 mA is exceeded, the output signal is increased by a certain fixed value and increased again by this fixed amount after the expiry of the 10 ms period, as long as the 50 mA threshold is exceeded.
  • the output signal is lowered stepwise, with preferably smaller increments than the increase being used. This happens up to an output signal of 0, unless the threshold value for the lamp current fluctuations is exceeded again beforehand.
  • the detection circuit thus detects by means of the threshold value too close to the capacitive operation, reacts with an output signal to this detection and drives the output signal back slowly as soon as this detection no longer applies.
  • the described output signal is limited in consideration of conceivable measurement errors and then subtracted in the symbolized by a minus sign differential element of a lamp current setpoint I Lamp Soll . From this corrected lamp current setpoint, in turn, the average value of the lamp current I Lamp averaged by the digital mean value element is subtracted.
  • the difference between them is integrated and multiplied by the normalization constant symbolized by k 1 .
  • the integrated and normalized difference between the lamp current setpoint corrected by the detection circuit and the lamp current actual value is then added to the value in the symbol symbolized by a circle in accordance with the arrow described with offset in order to perform an operating point adjustment.
  • This value stands for a period duration, which in turn is limited with regard to conceivable measurement errors and used to drive the switching transistors 6 and 7 of the half-bridge oscillator.
  • the PFC circuit is regulated to a constant intermediate circuit voltage with a setpoint U ZW target .
  • the modulation of the intermediate circuit voltage transmitted by the PFC circuit influences the lamp current via the half-bridge oscillator, which is regulated by a second control circuit to a lamp current desired value I lamp desired .
  • a simple slow 1-loop application because only long-term drift effects must be considered.
  • This lamp current setpoint is corrected by a third control circuit, in which the detection circuit is connected, so that the threshold value of 50 mA for the lamp current amplitude modulation is not permanently exceeded.
  • the invention has only a slow further control loop in the sense of an additional software branch, for which no further measured value determination is necessary. Rather, the already measured and digitized lamp current is used.
  • the illustrated control can be supplemented by a further control element in the lamp current control circuit, with which the 100 Hz modulation of the lamp current is attenuated.
  • a simple I-controller a PI controller can be used. This does not change the fact that, albeit smaller, lamp current modulations remain. Even if the Lampenstromomodulationen would be completely compensated, they could so far for the inventive detection of proximity to the capacitive operation use, as the control signal of the lamp current control circuit is used as a representative of the fluctuations of the lamp current. The fluctuations of the lamp current would then to a certain extent only exist in terms of control technology and no longer physically available.
  • the invention also relates to this variant. Incidentally, even with perfect lamp current regulation, the current would break in the capacitive range.
  • the intermediate circuit voltage U zw in FIG. 2 or between the connection 5 and ground 4 in FIG. 1 could also be a deliberately modulated voltage from a DC voltage source. This would not change the principle of this embodiment. In this case, however, the PFC circuit would be superfluous.
  • the invention thus makes it possible, with a small additional outlay, to achieve a very precise tuning of the operating circuit, despite component tolerances and lamp aging processes, to an average resonance-related continuous operation.
  • the lamp operation continues and made only a certain power reduction due to the change of the current setpoint. From the perspective of the user, the lamp, which shines with barely noticeably reduced brightness, is far less expensive than a non-functional lamp.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (11)

  1. Circuit pour faire fonctionner une lampe (1) à décharge comprenant
    un circuit (6, 7) oscillateur de production d'une puissance d'alimentation en haute fréquence pour un circuit (1, 8 à 11) de charge comportant la lampe (1) à décharge à partir d'une puissance (5) d'alimentation variable
    et un circuit (12, 13) de détection pour détecter que l'on est près d'un fonctionnement en mode capacitif du circuit (1, 8 à 11) de charge,
    caractérisé en ce que le circuit (12, 13) de détection détecte le niveau des fluctuations du courant (ILamp) de la lampe correspondant aux variations de la puissance (5) d'alimentation.
  2. Circuit pour faire fonctionner une lampe (1) à décharge comprenant
    un circuit (6, 7) oscillateur de production d'une puissance d'alimentation en haute fréquence pour un circuit (1, 8 à 11) de charge comportant la lampe (1) à décharge à partir d'une puissance (5) d'alimentation variable,
    un circuit (12, 13) de détection que l'on est près du fonctionnement en mode capacitif du circuit (1, 8 à 11) de charge
    et un circuit (12, 13) de régulation de la lampe pour réguler le circuit (1, 8 à 11) de charge sur une valeur (ILamp-Soll) de consigne de la lampe,
    caractérisé en ce que le circuit (12, 13) de détection détecte le niveau des fluctuations d'une grandeur de réglage du circuit (12, 13) de régulation de la lampe correspondant aux variations de la puissance (5) d'alimentation.
  3. Circuit suivant la revendication 1 ou 2, qui est conçu pour adapter, en réponse à la détection que l'on est près d'un fonctionnement en mode capacitif par le circuit (12, 13) de détection, le fonctionnement de circuit (6, 7) d'oscillateur, de façon à ce que la proximité du fonctionnement en mode capacitif ne soit pas augmentée davantage et de façon à pouvoir poursuivre le fonctionnement.
  4. Circuit suivant l'une des revendications précédentes, comprenant un circuit (12, 13) de régulation du courant pour réguler le courant (ILamp) de la lampe sur une valeur (ILamp-Soll) de consigne de courant.
  5. Circuit suivant l'une des revendications précédentes, comprenant un circuit de régulation de puissance pour réguler la puissance de la lampe pour une valeur de consigne de puissance.
  6. Circuit suivant la revendication 4 et 5, qui est conçu pour diminuer, en réponse à une détection que l'on est près d'un fonctionnement en mode capacitif, par le circuit 10, 13 de détection, la valeur (ILamp-Soll) de consigne de régulation.
  7. Circuit suivant l'une des revendications 4 à 6, dans lequel le circuit (12, 13) de régulation a un élément de régulation I.
  8. Circuit suivant l'une des revendications précédentes, dans lequel le circuit (12, 13) de détection effectue une comparaison du niveau des fluctuations à une valeur de seuil prescrite.
  9. Circuit suivant l'une des revendications précédentes, comprenant un circuit PFC qui alimente le circuit (6, 7) d'oscillateur en une puissance (5) en tension continue, qui est raccordé à un redresseur et qui est réglé sur la tension (5) continue.
  10. Circuit suivant l'une des revendications précédentes, qui est conçu pour une puissance d'alimentation en tension alternative et qui a un redresseur de production d'une puissance (5) en tension continue.
  11. Circuit suivant la revendication 9, dans lequel un microcontrôleur (12) comporte un circuit de commande forcé pour le circuit (6, 7) d'oscillateur et pour le circuit PFC.
EP03012453A 2002-06-11 2003-05-30 Circuit muni d'une détection d'approche de fonctionnement en mode capacitif pour alimenter une lampe à décharge Expired - Lifetime EP1377135B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10225881A DE10225881A1 (de) 2002-06-11 2002-06-11 Entladungslampenbetriebsschaltung mit Schaltung zur Detektion der Nähe zu einem kapazitiven Betrieb
DE10225881 2002-06-11

Publications (3)

Publication Number Publication Date
EP1377135A2 EP1377135A2 (fr) 2004-01-02
EP1377135A3 EP1377135A3 (fr) 2006-05-03
EP1377135B1 true EP1377135B1 (fr) 2007-07-25

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Application Number Title Priority Date Filing Date
EP03012453A Expired - Lifetime EP1377135B1 (fr) 2002-06-11 2003-05-30 Circuit muni d'une détection d'approche de fonctionnement en mode capacitif pour alimenter une lampe à décharge

Country Status (5)

Country Link
US (1) US6707262B2 (fr)
EP (1) EP1377135B1 (fr)
AT (1) ATE368368T1 (fr)
CA (1) CA2431713A1 (fr)
DE (2) DE10225881A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10225880A1 (de) * 2002-06-11 2003-12-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Entladungslampenbetriebsschaltung mit einer Stromregelschaltung und einer Schaltung zur Detektion der Nähe zu einem kapazitiven Betrieb
DE102005035466A1 (de) * 2005-07-28 2007-02-01 Tridonicatco Gmbh & Co. Kg Adaptive Regelung der Leistung von Gasentladungslampen
EP2124510B1 (fr) * 2008-05-16 2013-01-02 Infineon Technologies Austria AG Procédé de commande d'une lampe fluorescente et appareil de montage de lampes
DE102013216878A1 (de) * 2013-08-23 2015-02-26 Osram Gmbh Zweistufiger getakteter elektronischer Energiewandler
DE102018203599B4 (de) * 2018-03-09 2024-02-22 Inventronics Gmbh Schaltungsanordnung zum betreiben einer vorzugsweise leuchtmittel aufweisenden last

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723098A (en) * 1980-10-07 1988-02-02 Thomas Industries, Inc. Electronic ballast circuit for fluorescent lamps
EP0338109B1 (fr) * 1988-04-20 1994-03-23 Zumtobel Aktiengesellschaft Convertisseur pour lampe à décharge
US4928038A (en) * 1988-09-26 1990-05-22 General Electric Company Power control circuit for discharge lamp and method of operating same
US5075599A (en) * 1989-11-29 1991-12-24 U.S. Philips Corporation Circuit arrangement
US5696431A (en) * 1996-05-03 1997-12-09 Philips Electronics North America Corporation Inverter driving scheme for capacitive mode protection
US5914572A (en) * 1997-06-19 1999-06-22 Matsushita Electric Works, Ltd. Discharge lamp driving circuit having resonant circuit defining two resonance modes
ATE220849T1 (de) * 1997-12-23 2002-08-15 Tridonicatco Gmbh & Co Kg Elektronisches vorschaltgerät
ATE213901T1 (de) * 1997-12-23 2002-03-15 Tridonic Bauelemente Verfahren und vorrichtung zum erfassen des in einer gasentladungslampe auftretenden gleichrichteffekts
US6331755B1 (en) * 1998-01-13 2001-12-18 International Rectifier Corporation Circuit for detecting near or below resonance operation of a fluorescent lamp driven by half-bridge circuit

Also Published As

Publication number Publication date
EP1377135A3 (fr) 2006-05-03
EP1377135A2 (fr) 2004-01-02
US20030227264A1 (en) 2003-12-11
DE50307753D1 (de) 2007-09-06
DE10225881A1 (de) 2004-01-08
US6707262B2 (en) 2004-03-16
CA2431713A1 (fr) 2003-12-11
ATE368368T1 (de) 2007-08-15

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