EP2111085B1 - Chauffage intelligent par convertisseur à transfert indirect - Google Patents

Chauffage intelligent par convertisseur à transfert indirect Download PDF

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Publication number
EP2111085B1
EP2111085B1 EP09159438A EP09159438A EP2111085B1 EP 2111085 B1 EP2111085 B1 EP 2111085B1 EP 09159438 A EP09159438 A EP 09159438A EP 09159438 A EP09159438 A EP 09159438A EP 2111085 B1 EP2111085 B1 EP 2111085B1
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EP
European Patent Office
Prior art keywords
voltage
circuit
heating
coupling element
filament
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.)
Not-in-force
Application number
EP09159438A
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German (de)
English (en)
Other versions
EP2111085A1 (fr
Inventor
Dietmar Klien
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Tridonic GmbH and Co KG
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Tridonic GmbH and Co KG
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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
    • 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

Definitions

  • the present invention relates to circuits for heating gas discharge lamps, in particular fluorescent lamps, as they can be found, for example, in electronic ballasts (ECGs) use.
  • ECGs electronic ballasts
  • ECGs Electronic ballasts for fluorescent lamps are known from the prior art, which use Wendel carvingscen which are connected by means of a coupling element with a primary side, which is supplied with voltage.
  • a coupling element with a primary side, which is supplied with voltage.
  • the heating energy can be coupled transformer, capacitive, etc. in the primary circuit, which in turn is connected to the coils.
  • a coil heater for fluorescent lamps according to the flyback principle is for example from the US 5,703,441 known.
  • the WO 00/72640 A1 shows a filament heating with a heating transformer having a primary winding connected to the output of the inverter of the electronic ballast and the one located in a heating circuit with a coil secondary winding for heating each of the two electrodes of a gas discharge lamp.
  • a series circuit is provided which contains the primary winding of the heating transformer and an electronic switch device.
  • WO 03/045117 shows a converter, which is also switched off in case of error.
  • WO 00/72642 shows a heater that is powered starting from the midpoint of an inverter.
  • a fluorescent lamp and with a coupling element for transmitting the heating energy from a primary side to a secondary side "intelligent" in the sense that in the presence of except Standard operating parameters are met.
  • a circuit for heating at least one filament of a gas discharge lamp has a coupling element which transmits heating energy from a primary side, which is supplied with voltage, to a secondary side, which in turn is connected to at least one coil to be heated.
  • the transmission of heating energy is usually carried out under galvanic isolation.
  • a monitoring circuit which detects the current flow at least in the primary side of the coupling element, so that corresponding countermeasures can be taken by changing at least one operating parameter of the heating circuit when an impermissible current flow is detected.
  • the heating circuit can be switched to an error mode in which the energy transfer of the coupling element is limited to a predetermined value greater than zero. In this error mode, therefore, heating energy continues to be transmitted, albeit to a controlled degree.
  • a base load can be provided, which consumes the energy transmitted through the coupling element in the event that no lamp is used and thus there is no heating coil.
  • This base load may be due to resistors of a voltage divider be formed, which is also used to detect the secondary side voltage.
  • the coupling element can be clocked on the primary side by means of a switch, the switching frequency and / or duty cycle in the error mode compared to the regular operation modified, in particular reduced.
  • the change in the switching frequency and / or the duty cycle of the switch on the primary side of the coupling element thus represents a possibility of changing operating parameters of the heating circuit.
  • the monitoring circuit can also detect the voltage on the secondary side of the coupling element.
  • the monitoring circuit is preferably implemented by hardware, so that upon detection of a fault, a quick response can occur.
  • This hardware implemented monitoring circuit can send a message to a software controlled controller in the presence of the error mode.
  • a software-controlled controller can in principle transmit operating parameters to the hardware-implemented monitoring circuit at least in the error mode and / or during normal operation of the heating circuit.
  • a circuit for heating at least one filament of a gas discharge lamp wherein in turn a coupling element serves to heat energy from one with Supply voltage supplied primary side to a secondary side, which is connected to the coil to be heated.
  • a monitoring circuit may be provided to detect the voltage of a secondary side of the coupling element, and to take countermeasures by changing an operating parameter of the heating circuit upon detection of an out-of-standard voltage, in particular too high a voltage.
  • the coupling element may be capacitive or transformable.
  • the coupling element may comprise a clocked flyback converter ("flyback power converter").
  • the invention also relates to a control gear with such a circuit.
  • an electronic ballast which has a heating circuit for at least one filament of a gas discharge lamp.
  • the transmission of the heating energy from a power supply to the coil to be heated is effected by means of a coupling element that is driven by a circuit implemented in hardware.
  • the implemented in hardware circuit may also monitor an operating parameter of the primary and / or secondary side of the coupling element.
  • a software-controlled circuit can be provided to transmit setpoints for the operation of the coupling element to the circuit implemented in hardware.
  • the invention also provides an electronic ballast for fluorescent lamps with a heating circuit, in which a monitoring circuit monitors at least one operating parameter of the heating circuit and transmits error messages with respect to the heating circuit to a software-controlled circuit.
  • the software-controlled circuit can change upon receipt of an error message at least one operating parameter of the ballast and in particular an operating parameter of the heating circuit depending on the current operating state of the ballast.
  • the invention further relates to methods for heating the coil of at least one gas discharge lamp and to methods for operating an electronic ballast.
  • heating circuit is used to provide electrical energy for coils 5, 6 a Gas discharge lamp, such as a fluorescent lamp.
  • the energy is transmitted from a primary side of a coupling element, which is supplied with voltage, toward a secondary side of the coupling element, wherein the secondary side is connected to at least one coil 5, 6.
  • the coupling element is designed as a clocked flyback converter.
  • the primary side of the flyback converter has a voltage supply and a primary coil 2 connected in series with a switch 12.
  • the voltage supply is a DC voltage supply, so that, for example, the intermediate circuit voltage or bus voltage V bus that is usually regulated by a smoothing circuit (PFC, Power Factor Correction Circuit) can be used in an electronic ballast.
  • PFC Power Factor Correction Circuit
  • electrical energy is transmitted from the primary coil 2 to the secondary side, the secondary side in the illustrated example depending on a branch starting from a first secondary coil 3 to a first coil 5 and a second secondary coil 4 towards a second coil 6 has.
  • the secondary side can thus supply one or more coils 5, 6.
  • the heat energy transmitted in the clocked flyback converter essentially depends on the switching frequency and the switch-on time T on of the switch 12.
  • This switch 12 which may be embodied as an FET, for example, is controlled by a heating control circuit 7 implemented in hardware.
  • the helical heater as mentioned on a clocked flyback converter, which is operated with a defined on-time T on and frequency f.
  • the switch control thus enables independent operation of the heating circuit, which, for example, when coupling the heating circuit to an inverter center point is not the case.
  • the independent operation of the heating circuit is just advantageous for preheating. Furthermore, there are design freedoms, which is advantageous for a dimming operation or a multi-lamp operation.
  • the setpoint values for the switch-on time T on and the frequency f of the switching operations of the electronic switch 12 are set according to the invention by a software-controlled circuit (microcontroller) 9 which communicates bidirectionally with the heating control circuit 7 (see reference numeral 8).
  • the specifications for the switch-on time T on and / or the switching frequency f of the illustrated switched-mode flyback converter can be determined by the microcontroller 9 For example, depending on the current dimming state of the lamp and a possibly (for example. Via the helical current) detected lamp type calculated and then the heating control circuit 7 are given.
  • the microcontroller 9 can receive, for example via an interface 10 dimming commands, for example, according to the DALI standard.
  • the primary side with the coil 2 and the switch 12 of the flyback converter transformer is connected in the illustrated example to an intermediate circuit voltage or bus voltage V bus , as this always has a substantially constant potential, thereby ensuring that at constant on time T on and frequency f of the electronic switch 12 a constant heating energy is delivered to the secondary side of the flyback converter.
  • the illustrated invention is now particularly designed to detect fault conditions of the heating circuit and to take appropriate countermeasures in a timely manner.
  • the heating control circuit 7 detects a fault condition and automatically transitions to an error mode.
  • This error mode can be, for example, that continues to heat energy is transferred with a value greater than zero by means of the coupling element to the secondary side.
  • the frequency f and / or the turn-on time of the switch 12 of the flyback converter is preferably reduced to reduce the primary-side filament current in the event of such a short-circuit condition.
  • heating energy continues to be transmitted.
  • the coupling element designed here as a flyback converter, are completely switched off, so that no heat energy is transmitted in error mode.
  • Another fault condition may be that there is no load on the secondary side, ie, for example, the lamp with the coils 5, 6 is not used or at least one coil is broken. Since the coupling element of the heating circuit normally continues to transmit heating energy to the secondary side in this case as well, the voltage on the secondary side will increase to impermissibly high values on the secondary side, so that components on the secondary side can be damaged.
  • a voltage divider R3, R4 is provided in the illustrated embodiment, at the midpoint of which a signal 14 for the heating control circuit 7 is tapped. The detection of the secondary-side voltage of the coupling element can alternatively or in addition to the detection of the primary-side helical flow 13 done.
  • An impermissibly high secondary-side voltage represents another fault condition.
  • a suitable countermeasure may be that the frequency f and / or the switch-on time T on of the switch 12 is reduced, so that a significantly reduced heating energy compared to the normal operating state Secondary side is transmitted. Alternatively, the transmission of the heating energy can also be stopped here.
  • the heating control circuit 7 is implemented by means of hardware, it can quickly detect such error conditions and accordingly also respond quickly by a suitable change of an operating parameter for the coupling element (change in the turn-on and / or the frequency of the switch in the present example).
  • the setpoint values for the heating mode can be specified by the hardware-implemented heating control circuit 7 for the normal operation and / or the error mode by the software-controlled microcontroller 9 via the bidirectional communication channel 8.
  • the hardware-implemented heating control circuit 7 automatically reacts very quickly to any detected fault conditions, but also simultaneously reports such an error condition to the microcontroller 9.
  • the microcontroller 9 Independently of the secondary-side voltage detection of the heating control circuit 7 by means of the voltage divider R3, R4, the microcontroller 9 detects the filament current through the resistor R1, so as to detect the type of inserted lamp via the filament resistor, and depending on this lamp type detection the corresponding setpoint specifications for the heating control circuit 7 to make.
  • the communication via the bidirectional channel 8 between the heating control circuit 7 and the controller 9 is preferably digital.
  • the microcontroller 9 can query the heating control circuit 7 for information regarding the presence of an error and possibly also the type of an error (short circuit or idle state without load, etc.).
  • the reduced heating energy transmitted in the fault mode is reduced by the resistors R3, R4 as a base load whose series resistance is thus dimensioned such that the voltage applied during the transmission of the reduced heating energy in the fault mode on the secondary side is limited to a permissible value.
  • sets the divider ratio of R3, R4, the cut-off voltage, ie the voltage from which an impermissibly high secondary voltage is closed and countermeasures are taken.
  • the voltage divider R3, R4 thus has a double function.
  • the series resistance can, for example, be dimensioned so that when transmitting a heating energy of 50 mW in fault mode, the voltage applied to 15 V is limited. At 15 V, damage to the secondary-side components provided can be ruled out.
  • a heating energy of 50 MW is large enough to generate a measurement current sufficient for measurement through the resistor R1.
  • the implemented in hardware heating control circuit 7 thus ensures that the heating circuit protects itself quickly. If this protection mechanism were implemented by a software controlled circuit, the protection reaction might be too slow to avoid damaging the transistor 12.
  • the microcontroller 9 queries a fault condition of the heating control circuit 7 or the heating control circuit transmits from itself the microcontroller 9 a fault condition and possibly also the nature of the error, the microcontroller 9 via outgoing commands 11, the operating device (electronic ballast EVG) in total switch to a fault mode.
  • the operating device electronic ballast EVG
  • the reaction of the microcontroller 9 to the message or the query of a fault condition of the heating circuit depends on the current operating state of the device. Possible through the Microcontroller 9 initiated actions in the operating device are, for example, switching off the inverter or waiting for a lamp replacement.
  • Fig. 2 schematically shows a state diagram as implemented by software in the microcontroller 9.
  • the software is first started in the STARTUP SOFTWARE state.
  • the known preheating begins in the PREHEAT state and, after completion of the preheating, the ignition of the lamp begins. If the lamp is successfully ignited, the system switches to RUN mode. Only when the lamp is in the RUN state, an error of the heating circuit is evaluated by the microcontroller 9. If there is an error starting from the state RUN, then ERROR is switched to the error mode.
  • the microcontroller 9 waits for the replacement of the lamp, since it can detect the presence of a lamp with coils via the resistor R1. After the lamp has been replaced, the state RELAMP is assumed, from which a restart of the lamp is possible.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Dc-Dc Converters (AREA)
  • Synchronizing For Television (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)

Claims (10)

  1. Circuit pour l'identification du type d'une lampe à décharge de gaz avec au moins un filament de chauffage (5, 6), présentant
    - un élément de couplage cadencé au moyen d'un commutateur (12), l'élément de couplage transmettant de l'énergie de chauffage depuis un côté primaire (2) alimenté en tension vers un côté secondaire, qui est relié au filament (5, 6) à chauffer,
    dans lequel le commutateur (12) est commandé par un circuit de commande de chauffage (7) implémenté par du hardware,
    - une charge de base disposée dans le côté secondaire et formée par des résistances d'un diviseur de tension (R3, R4) qui, au cas où aucune lampe n'est mise en place, consomme l'énergie transmise par l'élément de couplage,
    - un signal au point central du diviseur de tension (R3, R4) du côté secondaire pour le circuit de commande de chauffage (7), destiné à la détection de la tension du côté secondaire, une résistance (R1) du côté secondaire destinée à la détection du courant à travers le filament (6), qui est connecté en série avec le filament (6) et le diviseur de tension (R3, R4), et
    - un contrôleur (9), qui identifie le type de la lampe mise en place à partir de la détection du courant de filament, en particulier à partir de la résistance de filament, le circuit de commande de chauffage (7) détectant (R2) une circulation de courant dans le côté primaire de l'élément de couplage et, au cas où le courant du côté primaire dépasse une valeur de seuil prédéterminée, la transmission d'énergie de l'élément de couplage est limitée à une valeur prédéterminée supérieure à zéro de telle sorte qu'un courant de mesure suffisant pour réaliser une mesure est généré à travers la résistance (R1) pour la détection du courant à travers le filament (6).
  2. Circuit selon la revendication 1,
    dans lequel le côté primaire (2) est alimenté en tension à partir d'une tension continue ou d'une tension de réseau redressée.
  3. Circuit selon la revendication 2,
    dans lequel le côté primaire (2) est alimenté en tension à partir d'une tension de circuit intermédiaire continue d'un ballast électronique.
  4. Circuit selon la revendication 1,
    dans lequel le contrôleur (9) effectue une spécification de valeur de consigne pour un circuit de commande de chauffage (7) en fonction de l'identification du type de lampe.
  5. Circuit selon l'une des revendications précédentes,
    le circuit étant alimenté par une tension continue, qui est générée de préférence par un circuit de filtrage, par exemple un circuit de correction de facteur de puissance.
  6. Circuit selon la revendication 1,
    dans lequel l'élément de couplage est un convertisseur Flyback, qui est cadencé du côté primaire au moyen d'un commutateur.
  7. Appareil d'alimentation pour moyen d'éclairage, en particulier appareil multi-lampes,
    présentant un circuit selon l'une des revendications précédentes.
  8. Procédé pour l'identification du type de lampe mis en place dans un appareil d'alimentation,
    dans lequel un élément de couplage est alimenté avec une tension continue et est cadencé au moyen d'un commutateur (12), de manière à transmettre de l'énergie de chauffage depuis un côté primaire (2) vers un côté secondaire relié à un filament de chauffage de la lampe,
    dans lequel un circuit de commande de chauffage (7) implémenté par du hardware commande le commutateur (12), et
    dans lequel le courant de filament est mesuré dans le côté secondaire, et il en est conclu au type de lampe ou il est conclu au type de lampe à partir de la résistance de filament déterminée à partir du courant de filament mesuré dans le côté secondaire,
    dans lequel le circuit de commande de chauffage (7) identifie un état d'erreur et passe de manière autonome à un mode d'erreur, pour continuer à transmettre de l'énergie de chauffage dans le côté secondaire au moyen de l'élément de couplage, pour générer à travers la résistance (R1) un courant de mesure suffisant pour réaliser une mesure,
    dans lequel une charge de base, qui est disposée dans le côté secondaire, consomme l'énergie transmise par l'élément de couplage au cas où aucune lampe n'est mise en place,
    la charge de base étant formée par des résistances d'un diviseur de tension, et
    le circuit de commande de chauffage (7) détecte une tension du côté secondaire au moyen du diviseur de tension,
    dans lequel le circuit de commande de chauffage (7) détecte une circulation de courant dans le côté primaire de l'élément de couplage et, au cas où le courant du côté primaire dépasse une valeur de seuil prédéterminée, la transmission d'énergie de l'élément de couplage est limitée à une valeur prédéterminée.
  9. Procédé selon la revendication 8,
    dans lequel le côté primaire (2) est alimenté en tension à partir d'une tension continue ou d'une tension de réseau redressée.
  10. Procédé selon la revendication 9,
    dans lequel le côté primaire (2) est alimenté en tension à partir d'une tension de circuit intermédiaire continue d'un ballast électronique.
EP09159438A 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur à transfert indirect Not-in-force EP2111085B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005018761A DE102005018761A1 (de) 2005-04-22 2005-04-22 Intelligente Flyback-Heizung
EP06723975.6A EP1872630B2 (fr) 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur a transfert indirect

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP06723975.6 Division 2006-04-03
EP06723975.6A Division EP1872630B2 (fr) 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur a transfert indirect
EP06723975.6A Division-Into EP1872630B2 (fr) 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur a transfert indirect

Publications (2)

Publication Number Publication Date
EP2111085A1 EP2111085A1 (fr) 2009-10-21
EP2111085B1 true EP2111085B1 (fr) 2012-05-23

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ID=36329195

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06723975.6A Not-in-force EP1872630B2 (fr) 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur a transfert indirect
EP09159438A Not-in-force EP2111085B1 (fr) 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur à transfert indirect

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EP06723975.6A Not-in-force EP1872630B2 (fr) 2005-04-22 2006-04-03 Chauffage intelligent par convertisseur a transfert indirect

Country Status (5)

Country Link
EP (2) EP1872630B2 (fr)
CN (1) CN101164386A (fr)
AT (1) ATE434372T1 (fr)
DE (2) DE102005018761A1 (fr)
WO (1) WO2006111263A1 (fr)

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DE102012007449B4 (de) * 2012-04-13 2024-02-22 Tridonic Gmbh & Co Kg Verfahren zum Betreiben eines LLC-Resonanzwandlers für ein Leuchtmittel, Wandler und LED-Konverter

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DE19923945A1 (de) 1999-05-25 2000-12-28 Tridonic Bauelemente Elektronisches Vorschaltgerät für mindestens eine Niederdruck-Entladungslampe
EP1452073A1 (fr) 2001-11-23 2004-09-01 Koninklijke Philips Electronics N.V. Dispositif de chauffage d'electrodes d'une lampe a decharge

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Also Published As

Publication number Publication date
EP2111085A1 (fr) 2009-10-21
ATE434372T1 (de) 2009-07-15
WO2006111263A1 (fr) 2006-10-26
CN101164386A (zh) 2008-04-16
DE102005018761A1 (de) 2006-10-26
EP1872630A1 (fr) 2008-01-02
DE502006004002D1 (de) 2009-07-30
EP1872630B2 (fr) 2018-04-11
EP1872630B1 (fr) 2009-06-17

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