EP1189487B1 - Circuit électronique pour détecter l'usure des filaments de lampes à décharge - Google Patents

Circuit électronique pour détecter l'usure des filaments de lampes à décharge Download PDF

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Publication number
EP1189487B1
EP1189487B1 EP01118281A EP01118281A EP1189487B1 EP 1189487 B1 EP1189487 B1 EP 1189487B1 EP 01118281 A EP01118281 A EP 01118281A EP 01118281 A EP01118281 A EP 01118281A EP 1189487 B1 EP1189487 B1 EP 1189487B1
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EP
European Patent Office
Prior art keywords
voltage
operating device
capacitor
circuit part
input
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
EP01118281A
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German (de)
English (en)
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EP1189487A3 (fr
EP1189487A2 (fr
Inventor
Klaus Schadhauser
Harald Schmitt
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.)
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Publication of EP1189487A2 publication Critical patent/EP1189487A2/fr
Publication of EP1189487A3 publication Critical patent/EP1189487A3/fr
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Publication of EP1189487B1 publication Critical patent/EP1189487B1/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
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating 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
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the invention relates to a circuit arrangement for operating one or more low-pressure discharge lamps according to the preamble of claim 1. It is in particular a circuit which detects the breakage of a filament of a lamp and puts the circuit arrangement in a safe mode.
  • the life of a helical low-pressure discharge lamp is determined primarily by the life of the helices. If the coils are used up, the lamp voltage initially increases, accompanied by an undesired increase in temperature in the filament region of the lamp. Also, the lamp usually has a rectifying effect at this stage. Finally, the coil breaks, which can lead to the destruction of the lamp operating device and dangerous overheating of the lamp ends. For safe operation of the lamp and for the protection of the operating device, some cut-off devices are known:
  • the lamp voltage is used to obtain a criterion for the shutdown of the operating device (eg EP 0809923 ).
  • the lamp voltage is subject to strong fluctuations even in normal operation, so that in many cases no clear threshold can be specified at which a shutdown should be made.
  • the operating device a so-called coupling capacitor, which receives the DC component of the output voltage of the AC generator contained in the operating device.
  • the voltage at the coupling capacitor is used to detect the above-mentioned rectifying effect of the lamp.
  • a quantitative statement about the value of this voltage must be made and compared with a threshold.
  • the value of the voltage to be measured in normal operation is subject to strong fluctuations and therefore often no clear threshold can be specified. A reliable shutdown is therefore not possible or technically very expensive in many cases.
  • control gear for gas discharge lamps include an AC generator, which outputs at its output a voltage which has a DC component.
  • a half-bridge circuit may be used which contains two series-connected controlled switches.
  • these operating devices usually operate lamps that are not allowed to carry direct current. Therefore, in addition to other components, the lamp is usually connected to the AC voltage generator via a so-called coupling capacitor.
  • the coupling capacitor absorbs the DC component of the AC voltage source. For the purpose of switching off the operating device according to the invention, this DC voltage component can be filtered out via an averaging device.
  • a simple embodiment of the averaging is a first order low pass, which in the simplest case consists of only one resistor and one capacitor.
  • the DC voltage component of the coupling capacitor is now supplied to a circuit part responsible for the shutdown (hereinafter referred to as SD), which has a threshold characteristic at its input. It is important that this feed happens via a helix. In the case of a spiral break, the DC component of the coupling capacitor is missing at the input of the circuit part SD.
  • the threshold characteristic at the input of the circuit part SD only needs the DC voltage component of the coupling capacitor to be able to detect. This can be realized quite reliably without much effort. It should be noted, however, that apart from the DC component of the coupling capacitor, no further DC component is supplied to the input of the circuit part SD.
  • the threshold characteristic can be realized by a transistor. If a voltage is present at its input, it prevents the charging of a capacitor (referred to below as C7), which lies above its output terminals, for example. If the input voltage remains at Wendelbruch, the capacitor C7 charges up and triggers a shutdown of the operating device. The capacitor C7 is discharged during commissioning of the operating device. It thus prevents unwanted shutdown when starting the lamp.
  • the value of the capacitance of the capacitor C7 must be chosen so large that a shutdown can only be triggered after the DC component has stabilized on the coupling capacitor with an intact lamp. If the DC voltage component sets in, this is also an indication that the lamp has ignited properly. The DC voltage component on the coupling capacitor can thus also be used as "lamp burning" detection.
  • the shutdown of the operating device can be done by another controlled switch. If the other switch is activated, the above-mentioned AC voltage generator is put out of operation. This can be done in different ways. Usually an auxiliary voltage is required to generate drive signals in the AC generator. With the help of said further switch, the auxiliary voltage of the AC voltage generator can be suppressed and thus a shutdown of the operating device can be achieved. Some AC generators have a separate input to which a signal must be applied in order to enable the output signal of the AC generator (enabling signal).
  • this enable signal can be suppressed with said other switch for the purpose of shutdown.
  • the above-described circuit arrangement according to the invention for detecting a helix fracture is primarily suitable for only one helix, or for helices of a plurality of lamps connected in parallel, which are all at the same potential. If, in addition, coils are to be monitored which are at a different potential, this can be done in a different way, even with methods such as are already known from the prior art. In order to ensure a completely safe operation of a lamp, all filaments must be monitored, since it is not foreseeable which filament breaks first. Since the filaments belonging to a lamp are at very different potentials, especially during ignition, cost-effective implementations of the filament monitoring can generally not be applied simultaneously to both filaments.
  • the spiral monitoring according to the invention makes it possible in this context to combine it with other monitoring methods.
  • coils that are not monitored according to the invention by detecting the DC voltage component on the coupling capacitor can be monitored by another type. If the AC voltage generator requires an auxiliary voltage, it can be routed through the previously unmonitored coils. If these coils break, the auxiliary voltage supply is interrupted and the AC generator is switched off.
  • Another possibility for monitoring hitherto unmonitored helices is the detection of the AC voltage component at a lamp terminal.
  • the supply of the current for the gas discharge of the lamp takes place only at one end of the coil to be detected.
  • the applied AC voltage is coupled via a capacitor.
  • the amplitude of the decoupled AC voltage is substantially reduced. This can be exploited according to the invention to allow charging of the capacitor C7 to a value which, as described above, leads to a shutdown of the operating device. This is preferably done in that the discharge of the capacitor C7 is disturbed by another controlled switch.
  • the following requirement for the shutdown of a control gear is provided: If the lamp is changed after the shutdown, it should reset the shutdown and operation of the new lamp will be possible. According to the invention, we accomplish this by passing the charging current of the capacitor C7 over one or more coils. If the lamp is removed, the capacitor C7 discharges. If the voltage across the capacitor C7 falls below a predetermined value, the shutdown is reset.
  • Self-excited operating devices do not have a separate oscillator.
  • the drive signal for the circuit breaker is obtained from the load circuit.
  • the possibility of oscillator shutdown by means of auxiliary voltage interruption at Wendelbruch there is therefore not.
  • the shutdown in case of spiral breakage of the helix, which is not monitored by the DC voltage level at the coupling capacitor, by means of the above-explained detection of the AC voltage component. Then, however, this coil must not alone carry the charging current of the capacitor C7. Although the breakage of the helix would be detected, the subsequent charging of the capacitor C7 would be interrupted, so that no shutdown would come about. Therefore, according to the invention, both lamp filaments are used to provide the charging current for the capacitor C7.
  • capacitors are designated by the letter C, resistors by R, inductors by L, transistors by T and diodes by D, each followed by a number.
  • the operating device in FIG. 1 is designed for operation on an AC voltage network.
  • the mains voltage of, for example, 230Veff is connected.
  • D1, D2, D3, and D4 form a full-wave rectifier, which provides at its outputs P (plus) and M (ground) a DC voltage, hereinafter referred to as supply voltage available.
  • the capacitor C1 is connected between P and M.
  • An AC generator G draws its energy via P and M.
  • At the output O sets the AC generator G an alternating voltage with DC component for the operation of a gas discharge lamp ready.
  • the AC voltage generator G requires an auxiliary voltage H. Only for startup, the auxiliary voltage H is derived directly from the supply voltage via R1.
  • the auxiliary voltage H is generated via C3, which is connected to the terminal J2 of the coil W1.
  • D5, D6 and C2 serve to rectify and stabilize the AC voltage fed in via C3.
  • the lamp inductor L1 connects the output O of the AC generator G with the lamp filament W1 at the terminal J1.
  • the circuit for the gas discharge current through the lamp Lp is closed by the coil W2 at the terminal J3 via the coupling capacitor C5 to the mass M.
  • the resonance capacitor C4 is connected to the coil W1 at the terminal J2 and to the coil W2 at the terminal J4.
  • a circuit part SD contains the following components: T3, R2, D7, T4, C7, R5 and R6.
  • EDC of SD is the base of T4.
  • the emitter of T4 lies on the mass M. Between emitter and collector of T4 lies C7.
  • the voltage at the collector of T4 is supplied via a Zener diode D7 to the gate of T3.
  • D7 shows with the cathode on T4.
  • T3 is connected to the source on ground M.
  • the gate of T3 is connected to ground M via R2.
  • the drain of T3 is connected to the auxiliary voltage terminal H of the AC generator G.
  • R5 and R6 form a voltage divider. At the end of R6, the voltage divider is connected to ground M.
  • the collector of T4 is connected and thus also C7.
  • the charging current for C7 is fed. This is done via the helix W1 and R7 from the positive pole P of the supply voltage.
  • the potential at the input EDC of SD is so large (> 0.7V) that T4 is in the conducting state. C7 is therefore discharged and the potential at the collector of T4 is so low that the zener diode is not reverse-biased passes. If the potential of EDC drops so far ( ⁇ 0.7V) that T4 goes into the blocking state, then C7 is charged via R7, the filaments W1 and R5.
  • T3 is triggered and goes into the conductive state.
  • the auxiliary voltage H of the AC voltage generator G is short-circuited and thus switched off the operating device.
  • the input EDC of SD is driven from the junction of R3 and R4.
  • the other end of R4 is at ground M, the other end of R3 is at end J4 of filament W2.
  • C6 is switched parallel to R4.
  • the circuit consisting of R3, R4 and C6 acts as a low pass.
  • the DC component of the voltage applied to C5 via the coil W2 to the input EDC of SD is passed.
  • the potential at input EDC is so high in normal operation that the operating device is not switched off. If the coil W2 breaks, DC voltage is no longer present at terminal J4 of coil W2, the potential at input EDC drops below the threshold at which T4 is still in the conductive state and the operating unit is switched off.
  • the charging current of C7 is interrupted because of the missing coil W1.
  • the potential at the collector of T4 drops, T3 blocks and the AC voltage generator is supplied with the necessary auxiliary voltage (H) for a restart.
  • FIG. 2 shows an exemplary embodiment of the disconnection according to the invention by means of spiral break detection in an operating device with a self-excited AC voltage generator G.
  • the device is supplied with a DC voltage via the connections DC + and DC-. This corresponds to the supply voltage from Figure 1.
  • DC + and DC- is the series circuit of two semiconductor switches T6 and T7, which are designed here as a MOSFET.
  • the junction between the transistors forms the output O of the half-bridge realized by the semiconductor switches T6 and T7.
  • the discharged at the output O load current is detected by a feedback device FB and each supplied to a drive circuit DR1 and DR2 for the semiconductor switches T6 and T7.
  • the drive circuits DR1 and DR2 are respectively between the gate and source of the semiconductor switches T6 and T7 and cause an alternating switching on and off of these semiconductor switches, whereby at the output O of the half-bridge applied with respect to DC-afflicted with a DC voltage component AC voltage.
  • the series circuit of R20 and D20 is connected between DC + and the half-bridge output O.
  • the other end of the Diac D21 is applied to the gate of the upper half-bridge transistor T6.
  • C20 is charged via R20 when the device is started up. If the voltage at C20 exceeds the triggering voltage of diac D21, the upper half-bridge transistor T6 is triggered and the oscillation of the half-bridge is initiated. D20 is used to discharge C20 during operation.
  • T3 is designed as a bipolar transistor in comparison to FIG.
  • the collector of T3 is connected through diode D26 to the gate of the lower half-bridge transistor (T7). If T3 is activated, a current flows through D26, which prevents the activation of T7.
  • the resistor R5 is not connected directly to the terminal J2 of the coil W1 as in FIG. Rather, it is connected to a series circuit of a resistor and a diode (R21, D22, R22, D23) both with J2 and to the terminal J4 of the coil W2.
  • the AC input EAC of the circuit part SD is connected via C21.
  • C21 only passes the AC voltage component of the potential to J2 on EAC.
  • a voltage divider comprising the resistors R25 and R26 between EAC and DC.
  • the anode of D25 and the cathode of D24 are connected.
  • the anode of D24 is at the low potential of the supply voltage (DC-) and is needed to evaluate the negative part of the AC voltage at EAC.
  • the cathode of D25 is connected to the capacitor C22.
  • the other terminal of C22 is at the low potential of the supply voltage (DC-).
  • C22 is designed to integrate the D24 and D25 rectified AC voltage applied to EAC.
  • the voltage applied to C22 is supplied to a voltage divider formed by the resistors R27 and R28.
  • the junction of R27 and R28 is connected to the base of transistor T5.
  • the emitter of transistor T4 is not directly connected to the low potential of the supply voltage (DC-) via the collector-emitter path of T5. If no AC voltage is present at EAC, T5 and therefore also T4 are no longer activated, which means that C7 can be charged and triggers a shutdown.
  • FIG. 3 shows a variant of the circuit diagram from FIG.
  • the signal from the coupling capacitor C5 is sometimes subject to considerable interference.
  • the cause of these disturbances is often the sporadic contact which a spiral, which is already broken, is constantly being restored.
  • These disturbances counteract the extension in Figure 3 with respect to Figure 1.
  • the connection between the averaging capacitor C6 and the base of T4 is no longer direct, but via the series connection of R31 and the emitter-collector path of the transistor T31.
  • the collector of T31 is connected to the base of T4 and connected to ground (M) for further interference suppression via the parallel connection of R34 and C31.
  • the base of T31 is over R33 with the mass (M) and over R32 and R35 with the positive pole (P) connected.
  • FIG. 3 Another variation in Figure 3 with respect to Figure 1 is the connection of R5. He is not connected as in Figure 1 at the terminal J2 of the coil W1, but connected via R35 to the positive pole (P). Thus, the shutdown when replacing the lamp is not reset, but only at a power failure.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (10)

  1. Appareil électronique pour faire fonctionner une ou plusieurs lampes à décharge dans un gaz, qui contiennent des filaments, l'appareil ayant des caractéristiques suivantes
    - une première partie (SD) de circuit, qui exploite un signal à son entrée (EDC) tendant à ce que, si on passe au-dessus ou en dessous de seuls prescrits pendant un laps de temps prescrit, l'appareil soit mis dans un état sûr, qui doit empêcher une surcharge de l'appareil et/ou une surchauffe de lampes et/ou une mise en danger de l'homme par électrocution,
    - un générateur (G) de tension alternative, qui donne à sa sortie (O) une tension alternative ayant une composante de tension continue,
    - un circuit de phase, qui comporte au mois un condensateur (C5) absorbant au moins en partie ladite composante de tension continue
    caractérisé en ce que la tension est appliquée par ledit condensateur (C5) à la ladite entrée (EDC) de la première partie (SD) de circuit et cela par au moins un filament et par au moins une deuxième partie (AV) de circuit, qui fournit un signal qui correspond au moins à peu près à la moyenne de la tension sur ledit condensateur (C5), ladite entrée (EDC) de la première partie (SD) de circuit n'ayant pas, à l'exception par l'intermédiaire de la lampe, de liaison galvanique avec la sortie (O) du générateur (G) de tension alternative.
  2. Appareil suivant la revendication 1, caractérisé en ce que le générateur de tension alternative est un circuit en demi-pont ayant deux interrupteurs (T6, T7) commandés montés en série.
  3. Appareil suivant la revendication 1, caractérisé en ce que la deuxième partie (AV) de circuit comporte un passe-bas RC du premier degré pour former la moyenne.
  4. Appareil suivant la revendication 1, caractérisé en ce que ladite première partie (SD) de circuit comporte un interrupteur (T4) commandé qui, lorsque l'on passe en dessous d'un seuil de tension sur son électrode de commande autorise la charge d'un condensateur (C7) et, lorsque la tension sur ce condensateur (C7) passe au-dessus d'une valeur prescrite, met l'appareil dans un état sûr suivant la revendication 1.
  5. Appareil suivant la revendication 4, caractérisé en ce que le générateur (G) de tension alternative nécessite une tension (H) auxiliaire et/ou un signal de libération et l'état sûr de l'appareil est atteint par le fait que la tension (H) auxiliaire et/ou le signal de libération est désactivé au moyen d'un interrupteur commandé.
  6. Appareil suivant la revendication 1, caractérisé en ce que le générateur (G) de tension alternative nécessite une tension (H) auxiliaire et/ou un signal de libération et l'état sûr de l'appareil est atteint par le fait que la tension (H) auxiliaire et/ou le signal de libération est appliqué par au moins un filament qui est distinct des filaments de la partie caractéristique de la revendication 1.
  7. Appareil suivant la revendication 1, caractérisé en ce que la première partie (SD) de circuit a une deuxième entrée (EAC) et en ce que la composante de tension alternative de la tension fournie par le générateur (G) de tension alternative est appliquée par au moins un filament (W1), qui est distinct des filaments de la partie caractéristique de la revendication 1, à la deuxième entrée (EAC) de la première partie (SD) de circuit, l'appareil étant mis dans un état sûr, suivant la revendication 1, lorsque le niveau de la tension alternative sur la deuxième entrée (EAC) de la première partie (SD) de circuit devient inférieur à une valeur prescrite.
  8. Appareil suivant la revendication 4, caractérisé en ce que la phase dudit condensateur (C7) de la revendication 4 peut s'effectuer simultanément par plusieurs filaments (W1, W2) qui sont à des extrémités différentes d'une lampe, respectivement des diodes (D22, D23) qui sont polarisées de manière à autoriser une charge dudit condensateur (C7) étant montées dans chaque ligne dudit condensateur (C7) allant aux filaments.
  9. Appareil suivant la revendication 4 et 7,
    caractérisé en ce qu'un autre interrupteur (T5), qui s'ouvre lorsque le niveau de la tension alternative sur la deuxième entrée (EAC) de la première partie (SD) de circuit devient inférieur à une valeur prescrite est monté en série avec l'interrupteur commandé de la revendication 4 (T4).
  10. Appareil suivant la revendication 4, caractérisé en ce que seules sont exploitées des tensions à l'entrée (EDC) de la première partie (SD) de circuit, qui vont au-delà d'une fraction prescrite de la tension d'alimentation du générateur (G) de tension alternative.
EP01118281A 2000-09-18 2001-07-30 Circuit électronique pour détecter l'usure des filaments de lampes à décharge Expired - Lifetime EP1189487B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10046443 2000-09-18
DE10046443A DE10046443A1 (de) 2000-09-18 2000-09-18 Elektronische Schaltung zur Detektion des Wandelbruchs bei Gasentladungslampen

Publications (3)

Publication Number Publication Date
EP1189487A2 EP1189487A2 (fr) 2002-03-20
EP1189487A3 EP1189487A3 (fr) 2005-01-05
EP1189487B1 true EP1189487B1 (fr) 2007-11-07

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ID=7656863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01118281A Expired - Lifetime EP1189487B1 (fr) 2000-09-18 2001-07-30 Circuit électronique pour détecter l'usure des filaments de lampes à décharge

Country Status (9)

Country Link
US (1) US6566822B2 (fr)
EP (1) EP1189487B1 (fr)
KR (1) KR20020021997A (fr)
CN (1) CN1345175A (fr)
AT (1) ATE377926T1 (fr)
AU (1) AU775944B2 (fr)
CA (1) CA2357379A1 (fr)
DE (2) DE10046443A1 (fr)
TW (1) TW522758B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10160790A1 (de) * 2001-01-12 2002-08-08 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Einschalten einer Teilschaltungsanordnung
US7116063B2 (en) * 2003-07-28 2006-10-03 Matsushita Electric Works, Ltd. Dimmable discharge lamp lighting device
CN1874645B (zh) * 2005-05-31 2010-09-29 电灯专利信托有限公司 用于将灯安全连接到设备地的装置

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DE3247863A1 (de) * 1982-12-23 1984-06-28 Siemens AG, 1000 Berlin und 8000 München Anordnung zur abschaltung eines wechselrichters
DE3608615A1 (de) * 1986-03-14 1987-09-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb von niederdruckentladungslampen
DE3805510A1 (de) 1988-02-22 1989-08-31 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb einer niederdruckentladungslampe
US5027034A (en) 1989-10-12 1991-06-25 Honeywell Inc. Alternating cathode florescent lamp dimmer
DE4120649A1 (de) * 1991-06-22 1992-12-24 Vossloh Schwabe Gmbh Ueberspannungsgeschuetztes vorschaltgeraet
DE4238409A1 (de) * 1992-11-13 1994-05-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb von Niederdruckentladungslampen
US5493181A (en) 1994-03-22 1996-02-20 Energy Savings, Inc. Capacitive lamp out detector
US5612597A (en) * 1994-12-29 1997-03-18 International Rectifier Corporation Oscillating driver circuit with power factor correction, electronic lamp ballast employing same and driver method
DE19505459A1 (de) 1995-02-17 1996-08-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer Entladungslampe
US5493180A (en) * 1995-03-31 1996-02-20 Energy Savings, Inc., A Delaware Corporation Lamp protective, electronic ballast
DE19619580A1 (de) * 1996-05-15 1997-11-20 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Sicherheitsabschaltung bei asymmetrischer Lampenleistung
US5952790A (en) * 1996-09-06 1999-09-14 General Electric Company Lamp ballast circuit with simplified starting circuit
DE19715342C1 (de) * 1997-04-12 1998-12-17 Vossloh Schwabe Gmbh Vorschaltgerät für unabhängigen Parallelbetrieb von Niederdruck-Gasentladungslampen
DE19728847C1 (de) * 1997-07-05 1998-08-20 Vossloh Schwabe Gmbh Spannungsgeregeltes Vorschaltgerät für Gasentladungslampen

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Publication number Publication date
EP1189487A3 (fr) 2005-01-05
AU7216701A (en) 2002-03-21
KR20020021997A (ko) 2002-03-23
TW522758B (en) 2003-03-01
DE50113223D1 (de) 2007-12-20
US6566822B2 (en) 2003-05-20
US20020047604A1 (en) 2002-04-25
AU775944B2 (en) 2004-08-19
EP1189487A2 (fr) 2002-03-20
CA2357379A1 (fr) 2002-03-18
DE10046443A1 (de) 2002-03-28
CN1345175A (zh) 2002-04-17
ATE377926T1 (de) 2007-11-15

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