EP2132965B1 - Circuit pour le chauffage d'un filament - Google Patents

Circuit pour le chauffage d'un filament Download PDF

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Publication number
EP2132965B1
EP2132965B1 EP08707262A EP08707262A EP2132965B1 EP 2132965 B1 EP2132965 B1 EP 2132965B1 EP 08707262 A EP08707262 A EP 08707262A EP 08707262 A EP08707262 A EP 08707262A EP 2132965 B1 EP2132965 B1 EP 2132965B1
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EP
European Patent Office
Prior art keywords
filament
heating
voltage
circuit
switch
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.)
Revoked
Application number
EP08707262A
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German (de)
English (en)
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EP2132965A1 (fr
Inventor
Oliver Wynnyczenko
Dirk Dworatzek
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Tridonic GmbH and Co KG
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Tridonic GmbH and Co KG
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Application filed by Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2132965A1 publication Critical patent/EP2132965A1/fr
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Publication of EP2132965B1 publication Critical patent/EP2132965B1/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
    • H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions

Definitions

  • the present invention relates to circuits for heating at least one filament of gas discharge lamps, in particular fluorescent lamps, as can be found, for example, in electronic ballasts (ECGs) use.
  • ECGs electronic ballasts
  • ECGs electronic ballasts
  • Wendel carvingscen which are connected by means of a coupling element with a primary side, which is supplied with power.
  • 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.
  • This document seeks to solve the above-mentioned problem of overheating by the flyback converter can be operated in a fault mode with reduced power compared to the normal mode. Accordingly, a monitoring circuit is provided to detect the voltage of the secondary side of the coupling element. Upon detection of an out-of-standard voltage the fault mode is triggered and the heating power is reduced accordingly.
  • a gas discharge lamp for example a fluorescent lamp
  • 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.
  • the circuit is designed, as soon as the filament voltage reaches a desired value, to gradually reduce the heating power transmitted to the filament until the filament voltage drops below the nominal value.
  • a monitoring circuit for detecting the filament voltage is additionally provided in the heating circuit.
  • the heating circuit according to the invention is no longer provided a single fixed error mode, as has been proposed in the prior art. Rather, the heating power is reduced in several small gradual steps until the measured filament voltage is below a setpoint. Once, after a gradual reduction in heating power transfer, no overheating, i. If there is no more overvoltage at the helix, the helix will continue to operate at this frequency.
  • the coupling element is preferably clocked on the primary side by means of a switch whose switching frequency and / or duty cycle can be modified.
  • the heating circuit for heating the coil is preferably designed to reduce the transmitted heating power by gradually decreasing the switching frequency of the switch.
  • the transmitted heating power can be reduced by gradually reducing the on-time of the switch.
  • the heating circuit may include a controller for setting the target value.
  • the heating circuit has means for lamp type detection or filament detection, wherein the controller can define the desired value as a function of the type of lamp type or filament detection.
  • a comparator may be provided for comparing the filament voltage with the set point.
  • Different reference voltages can be connected to the reference input of the comparator.
  • the monitoring circuit of the heating circuit may also comprise an analog-to-digital converter.
  • the coupling element for transmitting the heating power can be designed as a flyback converter.
  • the invention further relates to a control device for lamps with such a circuit.
  • an electronic ballast for fluorescent lamps is provided with a circuit for heating at least one filament of a gas discharge lamp.
  • the circuit 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.
  • a monitoring circuit serves to detect the filament voltage. As soon as the filament voltage reaches a setpoint value, the voltage transmitted to the filament is transferred Heat output gradually reduced until the filament voltage drops below the setpoint.
  • a method for heating at least one filament of a gas discharge lamp is provided. Heating energy for the coil is transmitted from a primary side, which is supplied with power, to a secondary side, which is connected to the coil to be heated. At the same time the filament tension is detected. As soon as the filament voltage reaches a setpoint, the heating power transmitted to the filament is gradually reduced until the filament voltage drops below the setpoint.
  • the primary side is preferably clocked by means of a switch whose switching frequency and / or duty cycle is modified.
  • the transmitted heating power can be reduced by gradually decreasing the switching frequency of the switch.
  • the transmitted heating power can be reduced by gradually reducing the on-time of the switch.
  • the setpoint can be set as a function of a lamp type detection or coil detection.
  • heater circuit is used to provide electrical energy for coils 5, 6 of 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 1.
  • the primary side of the flyback converter 1 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
  • the flyback converter shown as an example it is also possible to use a heating circuit topology in which the primary side of the coupling element is formed by a primary winding connected in series with a switch, this series circuit being connected to the midpoint of two switches of an inverter (half bridge circuit) and For example, parallel to the potential lower switch by connecting the center point of the switch to ground.
  • electrical energy is transferred from the primary coil 2 to the secondary side, wherein the secondary side in the example shown 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 having.
  • the secondary side can thus supply one or more coils 5, 6.
  • the heat energy transmitted by the clocked flyback converter 1 essentially depends on the switching frequency and the switch-on time T on of the switch 12.
  • This switch 12 which may be designed, for example, as a field-effect transistor (FET) is driven by a heating control circuit 7, which is preferably implemented in hardware.
  • FET field-effect transistor
  • the coil heater as mentioned a clocked flyback converter 1, which with a defined on-time T on and frequency f is operated.
  • the switch control thus enables independent operation of the heating circuit.
  • 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 determined according to the invention by means of 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 clocked flyback converter 1 shown can be calculated by the microcontroller 9, for example, depending on the current dimming state of the lamp and an optionally (eg via the filament current) detected lamp type and then the heating control circuit 7 specified become.
  • 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 1 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 heat energy is discharged to the secondary side of the flyback converter 1.
  • the illustrated invention is now particularly adapted to detect the voltage of one or both coils 5, 6 and to take appropriate countermeasures in good time as soon as the filament voltage reaches or exceeds a certain threshold. If this threshold value is reached by the time-varying filament voltage over time, the heating power transmitted to the secondary side and to the filaments 5, 6 is gradually reduced until the filament voltage is again below the threshold value. Several small stages are provided for the heating power reduction.
  • 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 flyback converter 1 and the filament voltage can alternatively be done in other known ways.
  • the measurement or detection of the filament voltage is preferably carried out continuously and without interruption, so that the heating can be carried out reliably.
  • the threshold value with which the filament voltage is compared is selected so that the gas discharge lamp can be safely operated as long as the filament voltage is below this threshold. For filament voltages which are smaller than the threshold value, overheating of the coil 5, 6 and thus ignition via the potential difference of the coil 5, 6 is prevented.
  • this threshold value can be firmly defined in advance.
  • a corresponding setpoint value which is not to be exceeded, can therefore preferably be defined directly in a memory module 30 or by hardware in the heating circuit 7, see Fig. 2 , Alternatively, the setpoint can be stored in the microcontroller 9 and the heating circuit 7 are transmitted via the interface 8.
  • a comparator 31 is provided in the heating circuit 7, wherein the reference voltage of the memory module 30 is connected to a first input of the comparator 31 and the signal used for detecting the helical voltage signal 14 to a second input of the comparator 31.
  • the output signal of the comparator 31 is forwarded to the microcontroller 9 via a corresponding line 32.
  • the microcontroller 9 is thereby able to detect reaching or exceeding the predetermined setpoint value by the filament voltage and to reduce the on-time T on and / or the frequency f of the switching operations of the electronic switch 12 in stages the heat output for the coil 5, 6 accordingly gradually reduce.
  • heating circuit 7 which is suitable for different lamp or coil types. In further embodiments, it is thus ensured that, depending on the type of coil, a suitable threshold value can also be selected. If the heating circuit 7 can be operated with a plurality of different lamp types, it is preferable to use a lamp type detection known to the person skilled in the art and not described in more detail here.
  • the memory module 30 and / or the microcontroller 9 is designed to store, for different lamp types, in each case one desired value which represents the maximum value for the filament voltage. After preferably a lamp type detection, the filament voltage is now compared with the appropriate for the operated coils 5, 6 target value.
  • a comparator 31 can also be used here, see Fig. 2 to detect reaching the setpoint or the maximum value by the filament voltage.
  • the comparator 31 can therefore be used with selectively different reference values or reference voltages.
  • the secondary-side measurement of the filament voltage can alternatively be performed via an analog-to-digital converter 33 and not only via a simple comparator 31.
  • the tapped for detecting the filament voltage signal 14 is from the analog-to-digital converter 33rd digitized and forwarded to the microcontroller 9 via the digital line 8.
  • the microcontroller 9 is designed to store a desired value for different lamp types.
  • the threshold value is therefore wattage-specific and selected by the microcontroller 9, for example, based on a lamp or coil detection. Thus, different comparisons for different wattages can be performed by the microcontroller 9.
  • the microcontroller is able to gradually decrease the switching frequency f and / or the on-time T on of the electronic switch 12.
  • an unacceptably high secondary-side voltage or an inadmissibly high filament voltage is reacted in each case, in which the frequency f and / or the on-time T on the switch 12 is gradually reduced until the filament voltage is below the setpoint again.
  • the heating control circuit 7 is implemented by means of hardware, it can quickly detect such too high filament voltages and accordingly respond quickly by a suitable change in the turn-on and / or the frequency of the switch 12 for the flyback converter 1.
  • the setpoint values for the heating operation can be controlled by the software of the hardware implemented heating control circuit 7 Microcontroller 9 are specified 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 lamp used via the filament resistor, and depending on this type of lamp 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 request information from the heating control circuit 7 regarding the presence of too high a filament voltage or a possible filament overheating.
  • the microcontroller 9 can inform the operating device (electronic ballast electronic ballast) via outgoing commands 11.
  • Fig. 4 shows the timing of the helical voltage according to an embodiment of the present invention.
  • the filament voltage V w rises and reaches the threshold value Vo for a first time.
  • the switching frequency f of the electronic switch 12 can be reduced stepwise.
  • the adjustment of the heating power can be achieved by a gradual decrease in T on -time of the flyback converter 1.
  • the invention is also applicable to other clocked switch heating topologies, so that according to further embodiments of the present invention it can be used not only with flyback converter heating circuits but also with heating circuits with a tap on a half bridge.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • General Induction Heating (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Claims (17)

  1. Circuit de chauffage pour le chauffage d'au moins un filament (5, 6) d'une lampe à décharge de gaz, présentant
    - un élément de couplage, qui transmet l'énergie de chauffage pour le filament (5, 6) depuis un primaire (2) alimenté en tension vers un secondaire (3, 4), qui est relié au filament (5, 6) à chauffer,
    - un circuit de surveillance pour détecter la tension de filament dans le secondaire de l'élément de couplage,
    - un circuit de commande, qui est relié au circuit de surveillance et adapté à réduire la puissance de chauffage transmise au filament (5, 6) en cas de dépassement d'une valeur de consigne pour la tension de filament,
    caractérisé en ce que
    la réduction a lieu progressivement jusqu'à ce que la tension de filament baisse sous la valeur de consigne et
    le circuit de commande est adapté à poursuivre ensuite le fonctionnement du chauffage avec cette puissance de chauffage réduite.
  2. Circuit selon la revendication 1,
    l'élément de couplage est cadencé dans le primaire au moyen d'un commutateur (12), dont la fréquence de commutation et/ou le rapport cyclique est modifiée par le circuit de commande pour ajuster la puissance de chauffage transmise.
  3. Circuit selon la revendication 2,
    qui est adapté à réduire la puissance de chauffage transmise par une diminution progressive de la fréquence de commutation du commutateur (12).
  4. Circuit selon la revendication 2,
    qui est adapté à réduire la puissance de chauffage transmise par une réduction progressive du rapport cyclique du commutateur (12).
  5. Circuit selon l'une des revendications précédentes,
    présentant un contrôleur (9) pour l'établissement et la transmission vers le circuit de commande de la valeur de consigne.
  6. Circuit selon la revendication 5,
    présentant des moyens pour la reconnaissance de type de lampe ou la reconnaissance de filament,
    le contrôleur (9) définissant la valeur de consigne en fonction de la reconnaissance de type de lampe ou la reconnaissance de filament.
  7. Circuit selon l'une des revendications précédentes,
    présentant un comparateur pour comparer la tension de filament avec la valeur de consigne.
  8. Circuit selon la revendication 7,
    différentes tensions de référence pouvant être raccordées à l'entrée du comparateur dédiée à la valeur de consigne.
  9. Circuit selon l'une des revendications 1 à 6,
    le circuit de surveillance présentant un convertisseur analogique-numérique.
  10. Circuit selon l'une des revendications précédentes,
    l'élément de couplage étant formé comme convertisseur Flyback.
  11. Appareil d'alimentation pour moyen d'éclairage,
    présentant un circuit de chauffage selon l'une des revendications précédentes.
  12. Ballast électronique pour lampes fluorescentes
    présentant un circuit de chauffage selon l'une des revendications 1 à 10.
  13. Procédé pour le chauffage d'au moins un filament d'une lampe à décharge de gaz,
    - de l'énergie de chauffage pour le filament (5, 6) étant transmise depuis un primaire (2) alimenté en tension vers un secondaire (3, 4), qui est relié au filament (5, 6) à chauffer,
    - la tension de filament étant détectée, et
    - dès que la tension de filament atteint une valeur de consigne, la puissance de chauffage transmise au filament (5, 6) étant progressivement réduite jusqu'à ce que la tension de filament baisse sous la valeur de consigne.
  14. Procédé selon la revendication 13,
    le primaire (2) étant cadencé au moyen d'un commutateur (12), dont la fréquence de commutation et/ou le rapport cyclique est modifiée.
  15. Procédé selon la revendication 14,
    la puissance de chauffage transmise est réduite par une diminution progressive de la fréquence de commutation du commutateur (12).
  16. Procédé selon la revendication 14,
    la puissance de chauffage transmise est réduite par une réduction progressive du rapport cyclique du commutateur (12).
  17. Procédé selon l'une des revendications 13 à 16,
    la valeur de consigne étant définie en fonction d'une reconnaissance de type de lampe ou d'une reconnaissance de filament.
EP08707262A 2007-04-04 2008-01-24 Circuit pour le chauffage d'un filament Revoked EP2132965B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007016322A DE102007016322A1 (de) 2007-04-04 2007-04-04 Schaltung zur Wendelheizung
PCT/EP2008/000551 WO2008122324A1 (fr) 2007-04-04 2008-01-24 Circuit pour le chauffage d'un filament

Publications (2)

Publication Number Publication Date
EP2132965A1 EP2132965A1 (fr) 2009-12-16
EP2132965B1 true EP2132965B1 (fr) 2010-11-03

Family

ID=38521306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08707262A Revoked EP2132965B1 (fr) 2007-04-04 2008-01-24 Circuit pour le chauffage d'un filament

Country Status (5)

Country Link
EP (1) EP2132965B1 (fr)
CN (1) CN101682974B (fr)
AT (1) ATE487359T1 (fr)
DE (2) DE102007016322A1 (fr)
WO (1) WO2008122324A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010029511B4 (de) * 2010-05-31 2014-10-09 Osram Gmbh Schaltungsanordnung zum Betreiben einer Entladungslampe
DE102010064032A1 (de) * 2010-12-23 2012-06-28 Tridonic Gmbh & Co. Kg Geregelte Wendelheizung für Gasentladungslampen
DE102015107694A1 (de) * 2015-05-18 2016-11-24 Zed Ziegler Electronic Devices Gmbh Gasentladungslampe sowie Vorrichtung zu deren Temperierung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5703441A (en) 1995-11-02 1997-12-30 General Electric Company Multi-function filament-heater power supply for an electronic ballast for long-life dimmerable lamps
DE19956391A1 (de) * 1999-11-24 2001-05-31 Nobile Ag Verfahren und Vorschaltgerät zum Starten und Betreiben einer Leuchtstofflampe
US6819063B2 (en) * 2002-12-13 2004-11-16 Bruce Industries, Inc. Sensing voltage for fluorescent lamp protection
DE10303277A1 (de) * 2003-01-28 2004-07-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Start und Betrieb von Gasentladungslampen mit heizbaren Elektrodenwendeln
CN2692956Y (zh) * 2003-12-07 2005-04-13 王维鹏 荧光灯电子镇流器灯丝加热电路
JP4561350B2 (ja) * 2004-12-20 2010-10-13 東芝ライテック株式会社 放電灯点灯装置及び照明器具並びに照明システム
DE102005018761A1 (de) 2005-04-22 2006-10-26 Tridonicatco Gmbh & Co. Kg Intelligente Flyback-Heizung

Also Published As

Publication number Publication date
EP2132965A1 (fr) 2009-12-16
DE502008001715D1 (de) 2010-12-16
CN101682974A (zh) 2010-03-24
DE102007016322A1 (de) 2008-10-09
ATE487359T1 (de) 2010-11-15
WO2008122324A1 (fr) 2008-10-16
CN101682974B (zh) 2013-02-06

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