EP2138015B1 - Circuit permettant de produire une tension auxiliaire et de faire fonctionner au moins une lampe à décharge - Google Patents

Circuit permettant de produire une tension auxiliaire et de faire fonctionner au moins une lampe à décharge Download PDF

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Publication number
EP2138015B1
EP2138015B1 EP07728411A EP07728411A EP2138015B1 EP 2138015 B1 EP2138015 B1 EP 2138015B1 EP 07728411 A EP07728411 A EP 07728411A EP 07728411 A EP07728411 A EP 07728411A EP 2138015 B1 EP2138015 B1 EP 2138015B1
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EP
European Patent Office
Prior art keywords
coupled
terminal
auxiliary voltage
switch
capacitor
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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.)
Not-in-force
Application number
EP07728411A
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German (de)
English (en)
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EP2138015A1 (fr
Inventor
Peter Krummel
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Osram GmbH
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Osram GmbH
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Publication date
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Publication of EP2138015A1 publication Critical patent/EP2138015A1/fr
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Publication of EP2138015B1 publication Critical patent/EP2138015B1/fr
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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
    • H05B41/2825—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 by means of a bridge converter in the final stage
    • 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

Definitions

  • the present invention relates to a circuit arrangement for operating at least one discharge lamp having a first and a second input terminal for connecting a supply voltage, an inverter comprising at least a first and a second switch, which are coupled in series between the first and the second input terminal and between them a bridge center is defined, a drive circuit for at least the first and the second switch with an input for receiving a control signal and a device for generating an auxiliary voltage.
  • the auxiliary voltage comprises a first capacitor, a terminal for providing the auxiliary voltage, which is coupled via the first capacitor to a reference potential, a two-position controller having a first input to which the control signal is coupled in an inverted form, a second input which is connected to the Coupled to provide the auxiliary voltage, and an output, a switch having a control, a working and a reference electrode, wherein the control electrode is coupled to the output of the two-position controller, wherein the working electrode is coupled to the terminal for providing the auxiliary voltage, and an ohmic resistance.
  • the auxiliary power supply in standby has a different internal resistance as in normal operation, to reduce the power loss during normal operation.
  • An electronic operating device with an auxiliary voltage supply is known, which can either be fed via a transistor from the supply network or via an auxiliary winding of an existing boost converter choke.
  • FIG. 1 A generic, known from the prior art circuit arrangement is to illustrate the problem underlying the invention in Fig. 1 shown. It shows a section of an electronic ballast, which is usually connected via a filter circuit, a rectifier circuit, a PFC (Power Factor Correction) circuit with an AC mains. It is powered by the so-called intermediate circuit voltage U ZW , which is stabilized by means of a capacitor C UZW .
  • the intermediate circuit voltage U ZW in the present case feeds a half-bridge circuit comprising a first switch S1 and a second switch S2, and is usually of the order of 320 V.
  • the half-bridge center HM is coupled via a lamp inductor L to a discharge lamp La, which is a firing capacitor C 1 is connected in parallel, and which is coupled via a coupling capacitor C K to a reference potential. It has a controller 10, which can be digitally controlled via an interface 12, for example according to the DALI standard. In standby mode, ie with the inverter switched off, the controller 10 requires a power supply of about 2 mA, in normal operation, ie when the inverter is in operation, a power supply of about 30 mA. An "on" signal at the interface 12 causes a half-bridge driver circuit 14 to start operating and to drive the switches S1 and S2 in accordance with a default.
  • the interface evaluation made by the controller 10 must also be in the "off" state of the output circuit 16, the inverter with the switches S1 and S2, the lamp inductor L and the lamp La including wiring, be ready for use at any time, for example, to receive a new "on" command and evaluate. For this it is necessary to supply the controller 10 always in the "off” state with a voltage. Thus, to always keep the interface 12 in standby, standby losses occur, which are generally undesirable.
  • the known solution derives the standby current required for the controller 10 via an ohmic resistor R F and a two-point controller SSD controlled via a switch Q ISS directly from the intermediate circuit voltage U ZW .
  • the two-point controller SSD the control signal, which serves to turn on the half-bridge driver 14, supplied in an inverted form, so that the two-position controller starts its operation when the half-bridge driver 14 is turned off.
  • the controller 10 is no longer supplied with voltage via its operating supply circuit 18, the operating supply circuit comprising, by way of example, a capacitor C2 and two diodes D1 and D2, but via an auxiliary voltage V CC provided to a capacitor C VCC .
  • An input 20 of the two-point controller SSD is used to measure the voltage V CC .
  • Fig. 1 drawn current source ISS can be realized by an integrated circuit, in a very simplified form, however, also by an ohmic resistance.
  • the standby supply on the capacitor C VCC is only active when the output circuit is switched off via the interface 12.
  • the two-point controller SSD keeps the auxiliary voltage Vcc over the switched with the switch Q ISS power source ISS constant, by depending on the power consumption and height of the intermediate circuit voltage U ZW varies the duty cycle.
  • the standby power loss in this solution is about 0.5 to 1 W.
  • the required two-level current source is already integrated in some commercial half-bridge drivers in an advantageous manner.
  • circuit arrangement solves the problem of an additional auxiliary voltage supply for the normal "on” operation in that the circuit arrangement comprises a step-down converter which generates a regulated auxiliary voltage. It allows auxiliary voltage generation not only in standby mode but also in normal "on” operation, whereby standby power losses of 0.3 to 0.8 W can be achieved.
  • the disadvantage is that such a circuit arrangement is relatively expensive and requires a large number of components.
  • the object of the present invention is therefore to develop a generic circuit arrangement such that they basically allow a lower standby power loss with cost-effective implementation.
  • the present invention is based on the finding that the standby power loss can be significantly reduced by using a transformer.
  • the transformer is used as a flux converter, wherein the primary winding is coupled to the switch Q ISS , that a current through the primary winding leads to a change in the transmission ratio of the transformer current through the secondary winding, the secondary winding coupled to the capacitor C VCC is that a current through the secondary winding leads to a charging of the capacitor C VCC .
  • the current drawn from the intermediate circuit voltage U ZW drops by the factor of the transmission ratio compared with the in Fig. 1 shown circuit without transformer.
  • the power taken from the mains also decreases by the factor of the transformation ratio of the transformer.
  • a standby power loss of approximately 0.05 to 0.10 W can be achieved.
  • the primary winding and the ohmic resistor are connected in series, and this series circuit is coupled between the reference electrode of the switch and the first input terminal.
  • the device for generating the auxiliary voltage further comprises a first diode which is connected in parallel to the series circuit of the primary winding and the ohmic resistor and is arranged so that it allows a free-running of the current through the primary winding, and a second diode which is connected to the secondary winding in Series is connected, wherein the series circuit of secondary winding and second diode is coupled between the reference potential and the terminal for providing the auxiliary voltage.
  • the first and the second diode are preferably designed as fast recovery diodes.
  • a current source is coupled between the working electrode of the switch and the terminal for providing the auxiliary voltage. This is preferably realized particularly cost-effective by an ohmic resistance.
  • a further category of embodiments solves the second problem mentioned above in connection with the prior art: namely, it offers the advantage that it not only enables a reduction of the standby power loss, but also a continuous auxiliary voltage generation, ie an auxiliary voltage for the supply of the controller also in normal operation of the output circuit. This eliminates the operating supply circuit discussed in connection with the prior art.
  • the means for generating an auxiliary voltage further comprises a second capacitor having a first and a second terminal, wherein the capacitor is coupled to the bridge center and the primary winding such that a capacitive displacement current can flow through the primary winding.
  • this embodiment can also be used to generate a current through the secondary winding during normal operation and to charge the capacitor C VCC and thus to supply an auxiliary voltage to the controller.
  • the first terminal of the second capacitor is coupled to the bridge center and the second terminal of the second capacitor to the reference electrode of the switch. Since the switch is coupled to the primary winding such that a current through the switch generates a current through the primary winding, this ensures that a displacement current of the second capacitor leads to a current through the primary winding.
  • the auxiliary voltage generating device further comprises a third diode, the primary winding being coupled to the first input terminal via the third diode, the third diode being arranged to allow current to flow from the first input terminal to the primary winding the connection point between the primary winding and the third diode is coupled to the second terminal of the second capacitor.
  • the device for generating an auxiliary voltage further comprises a third capacitor, which is connected in parallel to the ohmic resistance. This allows the time constant at which the second capacitor is charged and discharged and thus set the duration of a current flow through the primary winding and therefore also through the secondary winding.
  • a zener diode is connected in parallel with the first capacitor. This protects the provided auxiliary voltage against overvoltage.
  • FIGS. 2 to 4 illustrated embodiments for the same and similar components continue to be used. In this respect, the following will essentially refer to the differences from the circuit arrangement of Fig. 1 received.
  • Fig. 2 illustrated embodiment of a circuit arrangement according to the invention further comprises the Fig. 1 known operating supply circuit 18 for the controller 10.
  • the half-bridge driver 14 comprises a transformer TR whose primary winding PW is arranged in series with the ohmic resistor R F.
  • the switch Q ISS becomes conductive due to appropriate control by the two-point controller SSD, a current flows from the intermediate circuit voltage U ZW through the primary winding PW and the ohmic resistance R F via the switch Q ISS and the current source ISS to charge the capacitor Cvcc.
  • the primary winding PW can over the resistor R F and a diode D F free run.
  • the secondary winding SW feeds the capacitor C VCC via a diode D CC , at which the auxiliary voltage V CC is provided.
  • the freewheeling diode D F provides with the resistor R F for the demagnetization of the transformer TR.
  • the standby mode is active and the two-point controller SSD is activated.
  • the two-point controller SSD determines that the auxiliary voltage V CC has fallen below the lower threshold of the two-position controller SSD by sensing its input 20, the current source ISS is switched on via the switch Q ISS .
  • a current flows through the primary winding PW and thus, transformed with the transmission ratio, and current from the secondary winding SW via the diode D CC in the capacitor Cvcc.
  • the voltage V CC at the capacitor C VCC increases .
  • the current source ISS is switched off via Q ISS .
  • the primary energy stored in the transformer is discharged via the resistor R F and the freewheeling diode D F.
  • the embodiments of circuit arrangements according to the invention according to Fig. 3 and according to Fig. 4 do not require a separate operating supply circuit for the controller 10, that is, the controller 10 is also in normal operation, when the output circuit 16 is in operation, over the transformer TR powered.
  • a capacitor C S between the half-bridge center HM on the one hand and the diode D F and the primary winding PW of the transformer TR on the other hand is coupled.
  • the resistor R F is a capacitor C S / F connected in parallel.
  • the output circuit 16 is activated and simultaneously deactivated the two-point controller SSD. This is the standby auxiliary voltage generation, see the comments on this Fig. 2 , shut down.
  • the switch Q ISS separates the current source ISS from the auxiliary voltage V CC .
  • the inverter comprising the switches S1 and S2 alternately switches the potential at the half-bridge center HM at a predetermined frequency between U ZW and ground.
  • Step 1 The voltage at the half-bridge center HM of the output circuit 16 decreases from the intermediate circuit voltage U ZW to ground:
  • the capacitor C S via the primary winding PW, the parallel circuit of the ohmic resistor R F and the capacitor C S / F and charged via the switch S2 to the intermediate circuit voltage U ZW .
  • This is done with a time constant which results from the ohmic resistance R F , the capacitor C S / F and the transformed load at the terminal at which the auxiliary voltage V CC is supplied to the controller 10.
  • the secondary winding SW of the transformer TR charges the capacitor C VCC via the diode D CC .
  • the transmitted energy can be optimized and adjusted.
  • the capacitor C S was 150 pF
  • the gear ratio ü of the transformer TR was 10
  • the ohmic resistance R F was 5.6 k ⁇
  • the capacitor C S / F was 6.8 nF.
  • an auxiliary voltage of V CC equal to 15 V could be generated, which was loadable at 30 mA.
  • a Zener diode D Z can be provided, as shown in dashed lines.
  • the capacitor C S can be dimensioned very small, for example 100 to 150 pF.
  • Fig. 4 illustrated embodiment of a circuit arrangement according to the invention is a variant of the in Fig. 3 shown.
  • the capacitor C S is charged via the diode D S and the switch S2.
  • An energy transfer takes place here during the unloading process of the Capacitor C S instead, which takes place via the switch S1, the primary winding PW of the transformer TR, the parallel connection of the ohmic resistor R F and the capacitor C S / F and the diode D F.
  • the charging energy can be adjusted via the transmission ratio ü of the transformer TR and the time constant effective during the respective charging process.
  • the time constant is chosen in particular such that a full transhipment of the capacitor C S for generating a maximum current-time area by the primary winding PW is made possible.

Landscapes

  • Dc-Dc Converters (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (9)

  1. Circuit pour faire fonctionner au moins une lampe à décharge (La), comportant :
    - un premier et un deuxième raccordement d'entrée pour raccorder une tension d'alimentation ;
    - un onduleur qui comprend au moins un premier commutateur (S1) et un deuxième commutateur (S2) qui sont couplés en série entre les premier et deuxième raccordements d'entrée et entre lesquels est défini un centre de pont (HM) ;
    - un circuit d'amorçage pour au moins le premier commutateur (S1) et le deuxième commutateur (S2), avec une entrée pour la réception d'un signal de commande ;
    - un dispositif pour générer une tension auxiliaire (VCC), comprenant :
    - un premier condensateur (CVCC) ;
    - un raccordement destiné à fournir la tension auxiliaire (VCC), lequel est couplé à un potentiel de référence via le premier condensateur (CVCC) ;
    - un régulateur deux points (SSD) avec une première entrée à laquelle est couplé le signal de commande sous forme inversée, une deuxième entrée qui est couplée au raccordement destiné à fournir la tension auxiliaire (VCC), et une sortie ;
    - un commutateur (QISS) avec une électrode de commande, une électrode de travail et une électrode de référence, l'électrode de commande étant couplée à la sortie du régulateur deux points (SSD), l'électrode de travail étant couplée au raccordement destiné à fournir la tension auxiliaire (VCC) ; et
    - une résistance ohmique (RF) ;
    caractérisé en ce que le dispositif pour générer la tension auxiliaire (VCC) comprend également un transformateur (TR) avec un enroulement primaire (PW) et un enroulement secondaire (SW), le transformateur (TR) étant couplé de manière telle aux premier et deuxième raccordements d'entrée, au raccordement destiné à fournir la tension auxiliaire (VCC) et au commutateur (QISS) qu'un courant traversant le commutateur (QISS) est à l'origine d'un courant traversant l'enroulement primaire (PW), lequel est, additionnellement et conformément au rapport de transmission du transformateur, à l'origine d'un courant traversant l'enroulement secondaire (SW) et entraîne donc un chargement du premier condensateur (CVCC).
  2. Circuit selon la revendication 1, caractérisé en ce que :
    - l'enroulement primaire (PW) et la résistance ohmique (RF) sont montés en série et
    - ce montage en série est couplé entre l'électrode de référence du commutateur (QISS) et le premier raccordement d'entrée,
    - le dispositif pour générer la tension auxiliaire (VCC) comprenant en outre :
    - une première diode (DF) qui est montée en parallèle avec le montage en série composé de l'enroulement primaire (PW) et de la résistance ohmique (RF) et qui est disposée de manière telle qu'elle permet au courant de traverser librement l'enroulement primaire (PW) ; et
    - une deuxième diode (DCC) qui est montée en série avec l'enroulement secondaire (SW), le montage en série composé de l'enroulement secondaire (SW) et de la deuxième diode (DCC) étant couplé entre le potentiel de référence et le raccordement destiné à fournir la tension auxiliaire (VCC) .
  3. Circuit selon l'une des revendications 1 ou 2, caractérisé en ce qu'une source de courant (ISS) est couplée entre l'électrode de travail du commutateur (QISS) et le raccordement destiné à fournir la tension auxiliaire (VCC).
  4. Circuit selon la revendication 3, caractérisé en ce que la source de courant (ISS) est réalisée par une résistance ohmique.
  5. Circuit selon l'une des revendications précédentes, caractérisé en ce que le dispositif pour générer une tension auxiliaire (VCC) comprend en outre un deuxième condensateur (CS) avec un premier raccordement et un deuxième raccordement, lequel est couplé de manière telle au centre de pont (HM) et à l'enroulement primaire (PW) qu'un courant de déplacement capacitif peut traverser l'enroulement primaire (PW).
  6. Circuit selon la revendication 5, caractérisé en ce que le premier raccordement du deuxième condensateur (CS) est couplé au centre de pont (HM) et en ce que le deuxième raccordement du deuxième condensateur (CS) est couplé à l'électrode de référence du commutateur (QISS).
  7. Circuit selon la revendication 5, caractérisé en ce que le dispositif pour générer une tension auxiliaire (VCC) comprend en outre une troisième diode (DS), l'enroulement primaire (PW) étant couplé au premier raccordement d'entrée via la troisième diode (DS), la troisième diode (DS) étant disposée pour permettre un flux de courant du premier raccordement d'entrée vers l'enroulement primaire (PW), le point de liaison entre l'enroulement primaire (PW) et la troisième diode (DS) étant couplé au deuxième raccordement du deuxième condensateur (CS).
  8. Circuit selon l'une des revendications 5 à 7, caractérisé en ce que le dispositif pour générer une tension auxiliaire (VCC) comprend en outre un troisième condensateur (CS/F) qui est monté en parallèle avec la résistance ohmique (RF).
  9. Circuit selon l'une des revendications précédentes, caractérisé en ce qu'une diode Zener (DZ) est montée en parallèle avec le premier condensateur (CVCC).
EP07728411A 2007-04-23 2007-04-23 Circuit permettant de produire une tension auxiliaire et de faire fonctionner au moins une lampe à décharge Not-in-force EP2138015B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/053954 WO2008128575A1 (fr) 2007-04-23 2007-04-23 Circuiterie permettant de faire fonctionner au moins une lampe à décharge et procédé de production d'une tension auxiliaire

Publications (2)

Publication Number Publication Date
EP2138015A1 EP2138015A1 (fr) 2009-12-30
EP2138015B1 true EP2138015B1 (fr) 2012-04-11

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Application Number Title Priority Date Filing Date
EP07728411A Not-in-force EP2138015B1 (fr) 2007-04-23 2007-04-23 Circuit permettant de produire une tension auxiliaire et de faire fonctionner au moins une lampe à décharge

Country Status (6)

Country Link
US (1) US8098022B2 (fr)
EP (1) EP2138015B1 (fr)
KR (1) KR101387051B1 (fr)
CN (1) CN101658074B (fr)
AT (1) ATE553633T1 (fr)
WO (1) WO2008128575A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009009535A1 (de) * 2009-02-18 2010-08-19 Osram Gesellschaft mit beschränkter Haftung Schaltung zur Ansteuerung eines Betriebsgeräts für eine Lichtanwendung, Betriebsgerät und Verfahren zum Betrieb der Schaltung
DE102010029981A1 (de) * 2010-06-11 2011-12-15 Osram Gesellschaft mit beschränkter Haftung Elektronisches Betriebsgerät für Gasentladungslampen mit verringerter Verlustleistung und Verfahren zum Betreiben des Betriebsgerätes
EP2546967B1 (fr) 2011-07-15 2014-01-29 OSRAM GmbH Procédé d'alimentation de sources lumineuses et dispositif associé
KR102083301B1 (ko) * 2013-06-12 2020-03-03 삼성전자 주식회사 전원공급부， 그 전원공급방법 및 그것을 구비한 디스플레이장치
FR3036013B1 (fr) * 2015-05-07 2019-01-25 Ge Energy Power Conversion Technology Limited Circuit d'attaque de grille pour reduire le couplage parasite
CN106787888B (zh) * 2016-12-26 2019-04-02 安徽大学 一种三电平anpc变换器中点电压平衡控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4018865A1 (de) 1990-01-20 1991-12-19 Semperlux Gmbh Elektronisches vorschaltgeraet zum betrieb von entladungslampen
DE10106438A1 (de) * 2001-02-09 2002-08-14 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorschaltgerät zum Betrieb von elektrischen Lampen
US7161305B2 (en) * 2004-05-19 2007-01-09 Monolithic Power Systems, Inc. Method and apparatus for single-ended conversion of DC to AC power for driving discharge lamps
DE102005025626A1 (de) * 2005-06-03 2006-12-07 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektronisches Vorschaltgerät für mindestens eine Lampe
DE102005041076A1 (de) * 2005-08-30 2007-03-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Betrieb mindestens einer ektrischen Lampe

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Publication number Publication date
US8098022B2 (en) 2012-01-17
ATE553633T1 (de) 2012-04-15
WO2008128575A1 (fr) 2008-10-30
EP2138015A1 (fr) 2009-12-30
KR101387051B1 (ko) 2014-04-18
CN101658074B (zh) 2013-11-20
US20100148699A1 (en) 2010-06-17
KR20100017276A (ko) 2010-02-16
CN101658074A (zh) 2010-02-24

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