EP0871348B1 - Ballast pour l'opération parallèle indépendante de lampes luminescentes à gaz de basse pression - Google Patents

Ballast pour l'opération parallèle indépendante de lampes luminescentes à gaz de basse pression Download PDF

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Publication number
EP0871348B1
EP0871348B1 EP98106203A EP98106203A EP0871348B1 EP 0871348 B1 EP0871348 B1 EP 0871348B1 EP 98106203 A EP98106203 A EP 98106203A EP 98106203 A EP98106203 A EP 98106203A EP 0871348 B1 EP0871348 B1 EP 0871348B1
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EP
European Patent Office
Prior art keywords
ballast
circuit
gas discharge
voltage
switch
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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
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EP98106203A
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German (de)
English (en)
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EP0871348A1 (fr
Inventor
Gert Knobloch
Peter Haaf
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Vossloh Schwabe Elektronik GmbH
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Vossloh Schwabe Elektronik GmbH
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    • 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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the invention relates to an electronic ballast with the features of the preamble of the claim 1.
  • the invention relates to an externally controlled Ballast with an inverter whose Frequency specified by a controlled oscillator is.
  • E.g. is a free-swinging from EP 0 239 793 B1 electronic ballast became known, that can supply two gas discharge lamps at the same time.
  • a free-swinging inverter the two Series resonance circuits connected in parallel feeds.
  • Each series resonance circuit has its own low-pressure gas discharge lamp assigned.
  • the secondary pages of the both transmitters are connected to a detector circuit, via a trigger circuit to the control electrode a thyristor is connected. This is grounded in the Failure to base the base of an inverter transistor to deactivate them and thus shut down the ballast.
  • the thyristor is connected via a resistor combination from the DC link voltage with a holding current supplies, and thus permanently blocks the ballast.
  • an extinguishing capacitor is provided for each lamp briefly the thyristor current when the lamp is inserted takes over and thus blocks it.
  • the free-swinging ballast is regarding its frequency is not stable, so that is expected must be that the individual lamp used a Power must be higher than in normal operation. Now, for example because only a single gas discharge lamp no second lamp is required, the gas discharge lamp is overloaded. However is it is sometimes wished to use a lamp as an alternative operate one or two (or more) gas discharge lamps to be able to design options regarding of brightness.
  • the electronic ballast according to the invention has at least one inverter half bridge that is externally controlled by a control circuit.
  • the control circuit specifies the working frequency so that undesirable effects from the lamp circle on the Working frequency can be reduced or excluded.
  • the fixed frequency creates in the individual lamp circles Ratios regardless of the number of lamp circuits connected to the inverter half bridge are. This is the electronic ballast suitable for this, if necessary different discharge lamp numbers to use. For example, on one for two Ballast provided for gas discharge lamps only if only one is connected, it can be operated without being overloaded and thus its lifespan sinks. This way you will otherwise end up the lifetime of the overloaded gas discharge lamp Avoided or reduced UV emissions.
  • the electronic ballast is equipped with a voltage monitoring device provided that the burning voltage monitors each individual gas discharge lamp. As soon as even just one of the existing gas discharge lamps Has a burning voltage that exceeds a maximum value, becomes the control circuit of the inverter half bridge deactivated and the inverter half bridge becomes complete blocked. The shutdown is done by a first Switch with breakdown characteristics switched on which is the supply voltage of the control circuit below a threshold UVLO (Undervoltagelockout) pulls below which the control circuit blocks the inverter half bridge.
  • the first switch A second switch is connected in parallel Reinstall at least one gas discharge lamp Supply voltage of the control circuit for a short time further lowered so that the first switch can lock.
  • connection with the ballast can be done very poorly. This enables the second controlled switch for only the control power must be applied. So that can his control provided components the one Connect to the gas discharge lamp, low be loaded components. Capacitors can be lower Dielectric strength and high impedance resistors are used become. Above all, this enables use of components with very small dimensions and in particular of SMD components (Surface Mounted Devices).
  • Which creates an essentially fixed potential offset Circuit can be a zener diode or a other component such as a resistor.
  • a kink characteristic (Z diode, light emitting diode or the like) is however advantageous.
  • the detector circuit is preferred connected to a connection of the gas discharge lamp, with the filament of the gas discharge lamp DC voltage applied circuit point connected is.
  • the DC voltage is usually that DC link voltage.
  • the separation of the occurring signals can be made easier Way made by a filter circuit that contains in particular a high pass. For suppression of low-frequency interference frequencies can be low-pass filters be provided so that there is ultimately a bandpass characteristic or another suitable filter characteristic results.
  • first switch can be a thyristor or a Transistor equivalent circuit can be used for this which contains a pnp transistor and an npn transistor, which are switched against each other with collectors and base are. The emitters form the ends of the switching path, with a base forming a control input.
  • the advantage of the transistor combination is that it is adjustable and preferably relatively low holding current, the with the ballast switched off from the DC link voltage must be removed, and thus a small one power loss occurring when the ballast is switched off has the consequence. If the holding current is very low, can the second switch can also be designed to be relatively high-resistance which can also be beneficial. Furthermore transistors are available as inexpensive SMD components.
  • the gas discharge lamps are individually one each Capacitor of a series resonance circuit connected in parallel, the series resonance circuits turn on in parallel connected the output of the inverter half bridge are. This leads to a decoupling of the gas discharge lamps from each other.
  • FIG. 1 In the single figure of the drawing is a block diagram of the ballast according to the invention, that in addition to a circuit for switching off Overvoltage on a connected gas discharge lamp another circuit component to enable one automatic restart contains.
  • an electronic ballast 1 shown in the schematic diagram, which is the operation of one or more low pressure gas discharge lamps 2a, 2b serves.
  • the electronic ballast 1 has one Mains rectifier and converter circuit 3, the one DC link voltage of approximately 400 volts to ground 4 delivers.
  • To generate the to operate the low pressure gas discharge lamps 2a, 2b required symmetrical AC voltage from the DC link voltage is used Inverter half bridge 6 in the present example is formed by two MOSFETs 7, 8. Their drain-source Lines are bridged by protective diodes.
  • the Inverter half bridge 6 is between the intermediate circuit voltage and ground 4 switched.
  • the Integrated circuit of the control circuit 11 is with an external circuit, not shown, which sets a certain working frequency. This means that on the output connections 12, 13 in push-pull Control signals for the MOSFETs 7, 8 with a given frequency so that the MOSFETs 7, 8 alternately however, do not open overlapping or conductive become.
  • the control circuit 11 has a supply voltage connection V CC , via which it is provided with operating voltage and at the same time with information as to whether it should control or block the MOSFETs 7, 8:
  • the control circuit 11 drives the MOSFETs 7, 8 alternately at and with a frequency which is predetermined by the external circuitry. If the supply voltage V CC falls below the threshold value UVLO, both MOSFETs 7, 8 are blocked.
  • a defined threshold value UVL undervoltage locking
  • the supply voltage is generated when the electronic ballast 1 is running, i.e. the connected Low-pressure gas discharge lamps 2a, 2b light up, from the one generated by the inverter half bridge 6 Square wave voltage.
  • the connection point 16 is by the connection of source and drain of the MOSFETs 7, 8 formed.
  • Via the capacitor C1 and C2 series connected diodes D1 and D2 are connected the inverter frequency of approximately 30 kHz charge packets to a smoothing connected to ground 4 or buffer capacitor C3, of which the Supply voltage to the corresponding supply voltage connection the control circuit 11 is performed.
  • An excess voltage is prevented by a Zener diode DZ1, which are connected to the anode of D1 and to their own anode is connected to ground.
  • a resistor R1 is provided, which has one end with the DC link voltage and with its other end is connected to the capacitor C3. About the resistance R1, capacitor C3 is charged with a low current, until the voltage on the capacitor C3 the Threshold voltage exceeds UVLI and the control circuit 11 starts.
  • Those to be operated by the electronic ballast Gas discharge lamps 2a, 2b are immediately above a respective resonance choke L1a, L1b and a respective one Coupling capacitor C4a, C4b to the connection point 16 connected to the output of the inverter half bridge 6 forms and with that of the control circuit 11th predetermined frequency between the intermediate circuit voltage and mass is switched back and forth.
  • the series connection of the resonance choke L1a and the coupling capacitor C4a is via a lamp holder, not shown connected to a terminal 21a of the gas discharge lamp 2a.
  • connection is made via a in the gas discharge lamp 2a lying coil 22a, to a connection 23a outside, which is connected to a resonance capacitor C5a further connection 24a of the gas discharge lamp 2a is connected to a coil 25a and over this to a connection 26a, which is connected to the intermediate circuit voltage lies.
  • the resonance inductor L1a and the resonance capacitor C5a form a series resonance circuit, which in undamped resonance case at the gas discharge lamp 2a a voltage drop that drops the intermediate circuit voltage can serve, the coupling capacitor C4a only the direct current separation of the gas discharge lamp 2 from the inverter half bridge 6, so that the lamp current contains no DC component.
  • An identically constructed, parallel connected Lamp branch contains the gas discharge lamp 2b and one Series resonance choke L1b a coupling capacitor C4b and a resonance capacitor C5b.
  • Voltage monitoring circuit 27 To monitor the on the gas discharge lamps 2a, 2b falling voltages is used Voltage monitoring circuit 27, the two circuit parts 27a, 27b, each containing the gas discharge lamps 2a, 2b are assigned. They are each one high-resistance resistor R2a, R2b with the lamp side End of the respective resonance choke L1a, L1b connected. Each circuit part 27a, 27b still contains on the input side an input resistor R3a, R3b with the respective Resistor R2a, R2b forms a voltage divider and the is connected to ground 4.
  • the input resistance R3a, R3b is one Downstream voltage doubler circuit 28a, 28b, the outputs a DC voltage signal with its output 29a, 29b, that of the lamp voltage of the respective Corresponds to gas discharge lamp 2a, 2b.
  • the outputs 29a, 29b of the subcircuits 27a, 27b are parallel to one another switched and with a control input 31 of a first controllable switch 32 connected to a End is connected to ground 4. Its other end is via a voltage offset circuit 33 with the supply voltage the control circuit 11 connected.
  • the switch 32 is turned on by an NPN transistor T1 and a pnp transistor T2 is formed.
  • the T1 emitter is connected to ground 4 and its collector is based on T2 connected.
  • the collector of T2 is at the base of T1 connected, which also has a resistor R4 and a capacitor C5 is connected to ground 4.
  • the base of T2 is through a resistor R5 and one Capacitor C6 connected to its emitter.
  • the transistors T1 and T2 form a bistable circuit which either assumes a non-conductive state in which the Distance from the emitter of T2 from the emitter of T1 is locked (locked state) or conducts (leading state).
  • the voltage offset circuit 33 which in the simplest case is formed by a Zener diode DZ2, has a voltage drop that is less than the threshold voltage UVLO.
  • the control circuit 11 is reactivated when the switch 32 conducts. If the voltage monitoring circuit 27 detects an excessively high voltage on the gas discharge lamp 2a or on the gas discharge lamp 2b, it switches the switch 32 to its conductive state, as a result of which the switch circuit 11 is blocked by lowering the supply voltage V CC under UVLO.
  • the supply voltage V CC is additionally connected via an optional resistor R7 to a controllable switch 34 which is connected to ground 4.
  • the switch 34 does not have to be a switch in the binary sense, but has a non-conductive state in which the current path from the resistor R7 to ground 4 is blocked, and a further state in which a certain current flow is permitted, which in the resistance of the Switch 34 can still have a relatively large value here.
  • the switch 34 is formed by a circuit the main part of which is an NPN transistor T3. His emitter is at ground 4 and its collector is connected to R7. Its basis is to avoid interference with a capacitor C10 connected to ground 4. Parallel to C10 a resistor R10 is provided, the T3 static holds in a non-conductive state. At the base of T3 are also two RC combinations 36a, 36b connected, belonging to tap circuits 37a, 37b, that of detection serve a lamp change. Any tap circuit 37a, 37b is a gas discharge lamp 2a, 2b assigned. On the output side, they are connected in parallel.
  • Each RC combination 36a, 36b has one on the input side Capacitor Clla, Cllb on, with one at each RC combination 36a, 36b leading resistor R11a, R11b forms a low pass.
  • the resistors form Rlla, R11b with input resistors R12a, R12b an ohmic voltage divider. Starting from this a capacitor C12a, C12b leads to the resistor R10 and forms a high pass with it.
  • further gas discharge lamps can also be provided be on the appropriate lamp branches with resonance choke and resonance capacitor and coupling capacitor connected and which other RC combinations 36 are assigned.
  • the inverter half bridge 6 provides an alternating voltage with which the low-pressure gas discharge lamps 2a, 2b are ignited and operated. Via the resistors R2a, R2b, the voltage monitoring circuit 27 detects a voltage that is less than a predetermined maximum value. Consequently, the voltage present at the control input 31 of the switch 32 does not exceed an ignition voltage which would be required to switch the switch 32 with a low resistance.
  • the low-pressure gas discharge lamp 2a and / or 2b shows an error which causes the operating voltage to rise inadmissibly, this is detected by the voltage monitoring circuit 27 and the switch 32 is ignited by a signal at its control input 31. It clamps the supply voltage V CC to a level below UVLO via the Zener diode DZ2. This completely blocks the inverter half bridge 6. This state is maintained by the switch 32 being held in place. A corresponding self-holding current is supplied from the DC link voltage via resistor R1.
  • the output capacitors of the subcircuits 27a, 27b can also be combined. It add up the capacitor the two subcircuits 27a, 27b Delivered loads what a switching off the half bridge 6 causes when both lamps 2a, 2b out of their sockets are removed. This serves to protect the half-bridge 6.
  • An electronic ballast 1 for the alternative Operation of one or more gas discharge lamps 2a, 2b points to the control of its inverter half bridge 6 a drive circuit 11 on the inverter frequency pretends.
  • the drive circuit 11 is in a locked state brought in by the inverter half bridge 6 locks. This is done using a thyristor-like Circuit that the supply voltage of the control circuit 11 decreased below a UVLO value.
  • a detector circuit provided the insertion of a new one Gas discharge lamp 2a, 2b recorded in their respective version. This is done by targeting a steep strong voltage rise at a connection of the gas discharge lamp accomplished that over the filament of the gas discharge lamp connected to the DC link voltage becomes.
  • the detector circuit contains a filter that the Filters out voltage rise and evaluates and interference voltages suppresses the otherwise faulty re-ignition processes could lead.

Claims (20)

  1. Ballast électronique (1) en particulier pour le fonctionnement en parallèle d'au moins deux lampes à décharge à basse pression (2a, 2b), avec une source de tension continue (3) qui sert à alimenter au moins les lampes à décharge qui comportent chacune deux filaments (22, 25 ) comme électrodes,
    avec au moins un demi-pont (6) connecté à la source de tension continue (3), qui fournit une tension alternative au niveau d'une borne de sortie (16) et dont la borne de sortie (16) est connectée aux lampes à décharge (2) par l'intermédiaire de moyens de couplage (L1, C4),
    avec un circuit de commande (11) pour le demi-pont (6), qui est connecté au demi-pont (6) par l'intermédiaire de bornes de commande (12, 13) et commande celui-ci avec une fréquence déterminée et qui comporte une une entrée de tension d'alimentation connectée à une source de tension d'alimentation (Vcc),
    le circuit de commande (11) passant dans un mode de fonctionnement actif, dans lequel il commande le demi-pont (6) avec une fréquence donnée, lorsque la tension d'alimentation dépasse vers le haut une valeur seuil (UVLI),
    le circuit de commande (11) passant dans un mode de fonctionnement passif, dans lequel le demi-pont (6) est bloquant, lorsque la tension d'alimentation dépasse vers le bas la valeur seuil (UVL0),
    avec un premier interrupteur commandé (32) à caractéristique d'auto-maintien qui est placé entre la tension d'alimentation (Vcc) et la masse (4), afin d'abaisser celle-ci au-dessous de la valeur seuil (UVL0) lorsqu'il est fermé,
    caractérisé
    par le fait que le premier interrupteur commandé (32) est connecté en série avec un circuit (33) qui produit décalage de potentiel lorsque l'interrupteur (32) est fermé et qui est commandé par un circuit de surveillance (27) de la lampe à décharge (2a, 2b) de manière telle que l'interrupteur est fermé lorsque le circuit de surveillance (27) détecte un état non admissible au niveau d'au moins une lampe à décharge, afin que la tension d'alimentation (Vcc) soit abaissée à une valeur inférieure à la valeur seuil (UVL0), mais ne tombe pas zéro, et
    par le fait qu'il est prévu un second interrupteur commandé (34) qui peut prendre un état non passant et un état au moins partiellement passant dans lequel il commute le premier interrupteur (32) à l'état non passant et dont l'entrée de commande est connectée à un circuit de détection (36) qui est associé à la lampe à décharge (2a, 2b) concernée et détecte la connexion de la lampe à décharge (2a, 2b) au ballast (1).
  2. Ballast selon la revendication 1, caractérisé par le fait que le circuit (33) qui génère un décalage de potentiel essentiellement fixe est une diode Zener (DZ2).
  3. Ballast selon la revendication 2, caractérisé par le fait que la diode Zener (DZ1) présente une tension de claquage qui n'est que faiblement inférieure à la valeur seuil (UVL0).
  4. Ballast selon la revendication 1, caractérisé par le fait que le circuit (33) qui génère un décalage de potentiel essentiellement fixe est une résistance (R).
  5. Ballast selon la revendication 1, caractérisé par le fait que le circuit de détection (35) est connecté chaque fois à une borne (24a, 24b) de la lampe à décharge (2a, 2b), elle même connectée par l'intermédiaire du filament (25a, 25b) à un point de circuit alimenté en tension continue (tension de circuit intermédiaire).
  6. Ballast selon la revendication 1, caractérisé par le fait que le circuit de détection (35) comprend chaque fois un circuit filtre (36).
  7. Ballast selon la revendication 6, caractérisé par le fait que-le circuit filtre (36) présente une caractéristique passe-haut dans un domaine de fréquence prédéterminé.
  8. Ballast selon la revendication 6, caractérisé par le fait que le circuit filtre (36) présente une caractéristique passe-bas dans un domaine de fréquence prédéterminé.
  9. Ballast selon la revendication 1, caractérisé par le fait que le second interrupteur (34) est connecté entre la tension d'alimentation (Vcc) et la masse (4) et par le fait que l'interrupteur (34) abaisse la tension d'alimentation (Vcc) du circuit de commande (11) à une valeur plus basse que le premier interrupteur (32) lorsqu'au moins le circuit de détection (35) placé en amont délivre un signal.
  10. Ballast selon la revendication 1, caractérisé par le fait que le premier interrupteur commandé (32) est formé d'un transistor pnp (T2) et d'un transistor npn (T1), dont les bases et les collecteurs sont connectés entre eux alternativement et dont les émetteurs constituent les bornes de connexion extérieures du circuit de l'interrupteur (32), une base (31) formant une entrée de commande (31).
  11. Ballast selon la revendication 1, caractérisé par le fait que le premier interrupteur commandé (32) est un thyristor.
  12. Ballast selon la revendication 1, caractérisé par le fait que le second interrupteur commandé (34) est un transistor (T3).
  13. Ballast selon la revendication 12, caractérisé par le fait que le second interrupteur commandé (34) est un transistor npn (T3) fonctionnant en circuit émetteur dont le collecteur est connecté à la tension d'alimentation (Vcc) via une résistance et dont l'émetteur est connecté à la masse (4).
  14. Ballast selon la revendication 13, caractérisé par le fait que la base du transistor (T3) est connectée à la masse (4) par l'intermédiaire d'une résistance (R8) à forte valeur ohmique.
  15. Ballast selon la revendication 1, caractérisé par le fait que les circuits de surveillance (35a, 35b) pour détecter l'amorçage d'au moins une lampe à décharge (2a, 2b) sont formés d'un branchement série d'un diviseur de tension à caractéristique passe-bas, d'un filtre passe-haut et d'un filtre passe-bas.
  16. Ballast selon la revendication 1, caractérisé par le fait que les lampes à décharge (2a, 2b) sont connectées chacune séparément à un circuit résonant série (L1a, C5a; L1b, C5b) d'élévation de tension.
  17. Ballast selon la revendication 1, caractérisé par le fait que l'élément de couplage pour connecter les lampes à décharge au demi-pont (6) est un condensateur de couplage (C4) pour réduire les composantes de courant continu.
  18. Ballast selon la revendication 1, caractérisé par le fait que le premier circuit de surveillance (27) pour la surveillance de la tension aux bornes de la lampe à décharge (2) comporte un trajet de courant (R2a, R2b) à forte valeur ohmique qui à partir d'une extrémité d'une bobine de résonance (L1a, L1b) dont l'autre extrémité est connectée au demi-pont (6), mène à une résistance reliée à la masse (4) et forme un diviseur de tension (R2a, R3a; R2b, R3b) avec celle-ci .
  19. Ballast selon la revendication 18, caractérisé par le fait qu'un circuit redreseur de tension (28) est connecté au diviseur de tension (R2a, R3a; R2b, R3b).
  20. Ballast selon la revendication 19, caractérisé par le fait que le circuit redreseur de tension (28a, 28b) comporte une sortie (29a, 29b) qui est connectée à l'entrée de commande (31) du premier interrupteur commandé (32).
EP98106203A 1997-04-12 1998-04-04 Ballast pour l'opération parallèle indépendante de lampes luminescentes à gaz de basse pression Expired - Lifetime EP0871348B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19715342A DE19715342C1 (de) 1997-04-12 1997-04-12 Vorschaltgerät für unabhängigen Parallelbetrieb von Niederdruck-Gasentladungslampen
DE19715342 1997-04-12

Publications (2)

Publication Number Publication Date
EP0871348A1 EP0871348A1 (fr) 1998-10-14
EP0871348B1 true EP0871348B1 (fr) 2000-06-07

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EP98106203A Expired - Lifetime EP0871348B1 (fr) 1997-04-12 1998-04-04 Ballast pour l'opération parallèle indépendante de lampes luminescentes à gaz de basse pression

Country Status (8)

Country Link
US (1) US6011358A (fr)
EP (1) EP0871348B1 (fr)
AT (1) ATE193798T1 (fr)
DE (2) DE19715342C1 (fr)
DK (1) DK0871348T3 (fr)
ES (1) ES2147037T3 (fr)
GR (1) GR3033853T3 (fr)
PT (1) PT871348E (fr)

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US7081722B1 (en) * 2005-02-04 2006-07-25 Kimlong Huynh Light emitting diode multiphase driver circuit and method
DE102007015508B4 (de) * 2007-03-28 2016-04-28 Tridonic Gmbh & Co Kg Digitale Steuerschaltung eines Betriebsgeräts für Leuchtmittel sowie Verfahren zum Betreiben eines Betriebsgerätes
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DE4140557A1 (de) * 1991-12-09 1993-06-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb einer oder mehrerer niederdruckentladungslampen
JP2600004Y2 (ja) * 1992-09-16 1999-09-27 株式会社小糸製作所 車輌用放電灯の点灯回路
DE4243955B4 (de) * 1992-12-23 2010-11-18 Tridonicatco Gmbh & Co. Kg Vorschaltgerät für mindestens ein parallel betriebenes Gasentladungslampen-Paar
JP3447776B2 (ja) * 1993-09-17 2003-09-16 池田デンソー株式会社 放電灯点灯装置
IT1275608B1 (it) * 1994-06-09 1997-08-06 Ars Spa Dispositivo per la regolazione della tensione elettrica di alimentazione di lampade elettroluminescenti
US5770925A (en) * 1997-05-30 1998-06-23 Motorola Inc. Electronic ballast with inverter protection and relamping circuits

Also Published As

Publication number Publication date
ATE193798T1 (de) 2000-06-15
US6011358A (en) 2000-01-04
EP0871348A1 (fr) 1998-10-14
PT871348E (pt) 2000-11-30
DE59800169D1 (de) 2000-07-13
DK0871348T3 (da) 2000-08-28
DE19715342C1 (de) 1998-12-17
ES2147037T3 (es) 2000-08-16
GR3033853T3 (en) 2000-10-31

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