EP1322142B1 - Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe - Google Patents

Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe Download PDF

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Publication number
EP1322142B1
EP1322142B1 EP02022782A EP02022782A EP1322142B1 EP 1322142 B1 EP1322142 B1 EP 1322142B1 EP 02022782 A EP02022782 A EP 02022782A EP 02022782 A EP02022782 A EP 02022782A EP 1322142 B1 EP1322142 B1 EP 1322142B1
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EP
European Patent Office
Prior art keywords
circuit
voltage
electronic ballast
ballast according
lamp
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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
Application number
EP02022782A
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German (de)
English (en)
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EP1322142A1 (fr
Inventor
Frederick Stevens
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Tridonicatco GmbH and Co KG
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Tridonicatco GmbH and Co KG
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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
    • H05B41/295—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

Definitions

  • the present invention relates to an electronic ballast for operating at least one gas discharge lamp, which has a monitoring circuit, with the aid of which a rectifying effect occurring in the gas discharge lamp can be detected.
  • This different emissivity has the consequence that from one lamp electrode to the other, a higher current flows than in the reverse direction, so that the time profile of the lamp current during one of the two half-waves has an increase.
  • asymmetries arise which not only cause a greater flicker of light at the end of the service life of the gas discharge lamp, but in extreme cases lead to operation only during a half-cycle.
  • the gas discharge lamp acts in this case like a rectifier, which is why this effect is also referred to as a so-called "rectifying effect".
  • the object of the present invention is to specify an alternative possibility for detecting a rectification effect, which can be realized as simply as possible and enables reliable detection of a rectification effect.
  • the monitoring circuit comprises a filter by means of which the DC voltage generated by a rectifying effect is determined from the lamp voltage. Furthermore, an evaluation circuit is provided, by means of which it is determined whether the DC component lies within or outside a permissible range, wherein a position outside the permissible range is an indication of the presence of a rectifying effect.
  • the evaluation circuit is part of a digitally configured control circuit, wherein the measurement voltage supplied to the evaluation circuit is converted and evaluated by means of an analog / digital converter into a digital value consisting of at least 2 bits.
  • the filter is formed by a voltage divider connected to the load circuit, above which the lamp voltage drops, wherein a lower resistance of the voltage divider is bridged by a capacitor.
  • This capacitor has the task of largely suppressing the AC component of the voltage to be measured, so that at the connection point of the resistors forming the voltage divider, at which the measuring voltage for the evaluation circuit is removed, a DC voltage is generated, which of a superimposed low AC voltage.
  • the tapped measuring voltage in order to facilitate the evaluation of the tapped measuring voltage, it may be provided to first raise the measuring voltage by a predetermined value into a positive range. This can be done, for example, by a current source which is connected to a measuring line connecting the voltage divider to the evaluation circuit. Alternatively, it is possible to connect a resistor to the measuring line, whose further connection is connected to a positive supply potential.
  • control circuit detects at least one operating parameter of a smoothing circuit formed by a switching regulator for generating an intermediate circuit voltage and controls a controllable switch of the switching regulator as a function of the value of the detected operating parameter, the detected operating parameter being determined by means of an analog / Digital converter is converted into a digital bit consisting of at least 2 bit and the control circuit calculates a switching information for operating the switch based on this digital value in a digital control part. This switching information is then transmitted to a driver circuit, which converts them into a corresponding control signal for driving the switch.
  • the control of the intermediate circuit voltage is thus realized digitally and with an accuracy of more than 2 bits, whereby on the one hand a very high stability for the control is achieved and on the other hand a circuit is obtained which takes up only little space.
  • the monitoring circuit for detecting the rectification effect is also at least partially digital, can also be in a digital design the control circuits for the DC link voltage and the inverter high integration of the entire circuit can be achieved.
  • it may be provided to provide a single one instead of a plurality of analog / digital converters, which operates to convert all detected operating parameters or measured values in the time multiplex for the respective control circuits or the monitoring circuit.
  • the analogue to digital converters convert the detected values into digital values with an accuracy of 12 bits.
  • the electronic ballast shown in Fig. 1 is the input side connected via a high frequency filter 1 to the mains supply voltage U 0 .
  • a rectifier circuit 2 in the form of a full-bridge rectifier, which converts the mains supply voltage U 0 in a rectified input voltage for the smoothing circuit 3.
  • the smoothing circuit 3 is used for harmonic filtering and smoothing the rectified supply voltage and comprises a smoothing capacitor C1 and an inductor L1, a controllable switch in the form of a MOS field effect transistor S1 and a diode D1 having boost converter.
  • other types of switching regulators can be used instead of the boost converter used here.
  • an intermediate circuit voltage U Z applied across the smoothing circuit 3 is generated, which is supplied to the inverter 4.
  • the inverter 4 is formed by two further MOS field-effect transistors S2 and S3, which are arranged in a half-bridge arrangement.
  • an alternating high-frequency driving of the two field effect transistors S2, S3, an alternating voltage is generated at the center tap, which is supplied to the load circuit 5 with the gas discharge lamp LA connected thereto.
  • This gas discharge lamp LA can in particular be a fluorescent tube.
  • the driving of the three MOS field-effect transistors S1 to S3 of the smoothing circuit 3 and of the inverter 4 is effected by a control circuit 6, which generates corresponding switching information and transmits it to a driver circuit 7.
  • the driver circuit 7 converts the switching information generated by the control circuit 6 into corresponding control signals for the gates of the three MOS field-effect transistors S1 to S3.
  • This switching information is generated in consideration of several operating parameters, which are tapped at different points of the smoothing circuit 3 and the load circuit 5 and the control circuit 6 are supplied.
  • the intermediate circuit voltage U Z itself as well as the current flowing through the inductance L1 or a voltage value corresponding to this current I L are measured on the one hand.
  • the operating parameter detected for the control of the inverter 4 is taken from the load circuit 5 and corresponds, for example, to the lamp voltage or the lamp current.
  • control circuit 6 has three analog / digital converters ADC 1 to ADC 3 on the input side, which convert the analog operating parameters taken from the smoothing circuit 3 or the load circuit 5 into digital values with an accuracy of at least 2 bits, preferably 12 bits.
  • the three digital values are then fed to a computational block 8, which, taking into account these current operating parameters, calculates control signals for the three switching elements S1 to S2 and transmits them to the driver circuit 7.
  • This digital version allows for a very precise control of the intermediate circuit voltage U Z and the power for the lamp LA and on the other hand offers the possibility of largely integrating the control circuit 6 and thus to make it very compact.
  • the control unit 6 is designed as a so-called application-specific integrated circuit (ASIC).
  • an evaluation circuit 10 is provided, which is also integrated in the control circuit 6.
  • the lamp LA is connected in parallel to a voltage divider 11 formed by three resistors R1 to R3 and a capacitor C3, at which a measuring signal is tapped off and supplied to the evaluation circuit 10.
  • the lower branch of the voltage divider 11 contains a parallel connection of the resistor R3 and the capacitor C3, wherein between this parallel circuit and the tapping point for the measurement signal, a further resistor R2 is arranged.
  • the measurement signal is again converted by a fourth analog / digital converter ADC4 into a digital value consisting of at least 2 bits, preferably 12 bits, and then processed or evaluated by the evaluation circuit 10 in a digital manner.
  • FIGS. 2a and 2b show, on the one hand, the time profile of the lamp voltage U LA (FIG. 2a) and, on the other hand, the input signal U tapped at the connection point between the two resistors R1 and R2 and supplied to the control circuit 6 i (Fig. 2b).
  • the task of the capacitor C3 is to largely suppress the AC component of the lamp voltage U LA .
  • Fig. 2a shown voltage applied to the lamp voltage U LA , which consists essentially of an AC signal with a very small - represented by the dotted line - DC component, a DC voltage signal is accordingly formed and the control circuit 6 is supplied, the only one superimposed low AC voltage.
  • the voltage divider 11 thus has the function of a filter which largely reverses the conditions present at the lamp LA.
  • the measuring signal U i shifted by the value ⁇ U should fluctuate periodically by this value ⁇ U.
  • the output signal, ie the voltage U LA present at the lamp LA already has a certain direct current, so that the measuring signal U i lies a little above the reference value ⁇ U.
  • the evaluation circuit 10 now determines whether this deviation from the reference signal .DELTA.U exceeds a predetermined upper limit up or down, which is shown in Fig. 2c by the two dotted lines.
  • the DC component is so small that at no time the upper or lower limit is exceeded, so that no rectifying effect is detected.
  • the DC voltage component of the lamp voltage U LA at the lamp LA is markedly higher, so that the measuring voltage U i shifted by the off-set voltage ⁇ U exceeds the upper limit several times.
  • This is detected by the evaluation circuit 10 and interpreted as having a rectifying effect.
  • the evaluation circuit 10 transmits a corresponding signal to the arithmetic block 8 of the control circuit 6 which, in response to this signal, either completely shuts off the electronic ballast or at least reduces the power supplied to the lamp LA in order to avoid excessive heating.
  • the capacitor C3 For the dimensioning of the voltage divider 11 provided in the capacitor C3 that this may not be too large, since the evaluation would otherwise be too slow. Furthermore, a large capacitor would be relatively expensive and would increase the cost of the circuitry. On the other hand, the capacitor must not be too small, otherwise the suppression of the AC voltage component would not be sufficient and, accordingly, the accuracy of the evaluation would be reduced.
  • FIG. 4 shows a further variant of the ballast according to the invention.
  • the lifting of the tapped off at the voltage divider 11 measurement signal takes place here not by an internal power source within the control circuit 6, but by a connected to the measuring line 12 resistor R4, which is connected at its other terminal to a positive supply voltage potential V +.
  • this variant is characterized by its simple structure and high reliability.
  • the advantage of the monitoring circuit according to the invention for detecting the rectification effect is that the circuit is very simple and requires no complicated additional components.
  • the digital processing of the measurement signal U i also ensures high reliability in detecting a rectification effect, with a rectifying effect in both directions of the lamp LA can be detected.
  • the four analog / digital converters ADC1 to ADC4 instead of the four analog / digital converters ADC1 to ADC4, only a single analog / digital converter can be used, which operates in time multiplex for processing the various operating parameters or measured values.
  • Another variant is to use two comparators instead of the fourth analog-to-digital converter ADC4 to determine whether the measurement signal is outside or within the allowable range.

Claims (16)

  1. Ballast électronique pour au moins une lampe à décharge gazeuse (LA), de préférence pour un tube fluorescent, comportant un montage redresseur (2), apte à être raccordé à une source de tension alternative (U0), un circuit de filtrage (3), qui est raccordé à la sortie du montage redresseur (2) et qui est destiné à générer une tension de circuit intermédiaire (Uz) et un onduleur (4) qui est alimenté par la tension du circuit intermédiaire (Uz) et à la sortie duquel est raccordé un circuit de charge (5) contenant des raccords pour la lampe (LA), et comportant également un circuit de surveillance destiné à détecter un effet redresseur généré dans la lampe à décharge gazeuse (LA), caractérisé en ce que le circuit de surveillance comporte un filtre (11) qui permet de déterminer, à partir de la tension de la lampe, la part de tension continue produite par un effet redresseur, et en ce que le circuit de surveillance comporte en outre un circuit d'analyse (10) qui permet de constater si la part de tension continue se situe à l'intérieur ou à l'extérieur d'un domaine toléré, un positionnement en dehors du domaine toléré désignant un effet redresseur, le circuit d'analyse (10) étant une partie intégrante d'un circuit de commande (6) numérique et la tension de mesure acheminée vers le circuit d'analyse (10) étant convertie en une valeur numérique formée par au moins 2 bits au moyen d'un convertisseur analogique/numérique (ADC4) et étant analysée par le circuit d'analyse (10).
  2. Ballast électronique selon la revendication 1, caractérisé en ce que le filtre est formé par un diviseur de tension (11) raccordé au circuit de charge (5), une résistance (R3) du diviseur de tension (11), agencée en dessous du point de prélèvement du diviseur de tension (11), étant pontée par un condensateur (C3).
  3. Ballast électronique selon la revendication 2, caractérisé en ce qu'une résistance (R2) supplémentaire est agencée entre le montage parallèle, formé par la résistance (R3) et le condensateur (C3), et le point de prélèvement.
  4. Ballast électronique selon la revendication 2 ou 3, caractérisé en ce que la tension de mesure prélevée sur le diviseur de tension (11) est augmentée dans un domaine positif selon une valeur prédéfinie avant l'analyse par le circuit d'analyse (10).
  5. Ballast électronique selon la revendication 4, caractérisé en ce que pour augmenter la tension de mesure, il est prévu une source de courant (Lq), qui peut être raccordée à la ligne de mesure (12) reliant le diviseur de tension (11) au circuit d'analyse (10).
  6. Ballast électronique selon la revendication 5, caractérisé en ce que la source de courant (Lq) est raccordée par l'intermédiaire d'un élément de commutation (Sq) activé par le circuit d'analyse (10).
  7. Ballast électronique selon la revendication 4, caractérisé en ce que pour augmenter la tension de mesure, il est prévu une résistance (R4), qui est raccordée à la ligne de mesure (12) reliant le diviseur de tension (11) au circuit d'analyse (10) et qui est raccordé à un potentiel de tension d'alimentation (V+) via son raccord supplémentaire.
  8. Ballast électronique selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit de filtrage (3) est formé par un régulateur de commutation et le circuit de commande (6) détecte au moins un paramètre de service (UI, IL, UZ) du circuit de filtrage (3) et active un commutateur (S1) réglable du régulateur de commutation en fonction de la valeur du paramètre de service (Ui, IL, UZ) détecté, le circuit de commande (6) comportant au moins un convertisseur analogique/numérique (ADAC1, ADAC2) pour convertir le paramètre de service (Ui, IL, UZ) détecté en une valeur numérique formée par au moins 2 bits, et le circuit de commande (6) calculant sur la base d'une valeur numérique dans un circuit de réglage (8) numérique une information de commutation pour l'actionnement du commutateur (S1) réglable du régulateur de commutation et la transmettant à un circuit d'excitation (7), qui transforme cette information de commutation en un signal de commande correspondant pour activer le commutateur (S1).
  9. Ballast électronique selon la revendication 8, caractérisé en ce que le circuit de commande (6) détecte la tension du circuit intermédiaire (UZ).
  10. Ballast électronique selon la revendication 8 ou 9, caractérisé en ce que le circuit de commande (6) détecte en outre au moins un paramètre de service du circuit de charge (5), le circuit de commande (6) comportant un convertisseur analogique/numérique (ADAC3) supplémentaire pour transformer ce paramètre de service en une valeur numérique formée par au moins 2 bits, calculant sur la base d'une valeur numérique dans un circuit de réglage (8) numérique une information de commutation pour l'actionnement de l'onduleur (4) et la transmettant au circuit d'excitation (7), qui transforme cette information de commutation en un signal de commande correspondant pour activer l'onduleur (4).
  11. Ballast électronique selon la revendication 10, caractérisé en ce que le circuit de commande (6) détecte le courant de la lampe.
  12. Ballast électronique selon l'une quelconque des revendications 8 à 11, caractérisé en ce que le circuit de commande (6), pour convertir tous les paramètres de service détectés ou les valeurs de mesure détectées, comporte un seul convertisseur analogique/numérique fonctionnant en multiplexage.
  13. Ballast électronique selon l'une quelconque des revendications 8 à 12, caractérisé en ce que le ou les convertisseurs analogiques/numériques (ADAC1-ADAC4) convertissent le ou les paramètres de service détectés ou les valeurs de mesure détectées en valeurs numériques avec une précision de 12 bits.
  14. Ballast électronique selon l'une quelconque des revendications 8 à 13, caractérisé en ce que le circuit de commande (6) est conçu sous forme de circuit intégré spécifique à l'application.
  15. Ballast électronique selon l'une quelconque des revendications précédentes, caractérisé en ce que le circuit d'analyse (10) déconnecte le ballast électronique lorsqu'il détecte un effet redresseur.
  16. Ballast électronique selon l'une quelconque des revendications 1 à 15, caractérisé en ce que le circuit d'analyse (10) réduit la puissance acheminée vers la lampe (LA) lorsqu'il détecte un effet redresseur.
EP02022782A 2001-12-20 2002-10-11 Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe Expired - Lifetime EP1322142B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10163033 2001-12-20
DE10163033A DE10163033A1 (de) 2001-12-20 2001-12-20 Elektronisches Vorschaltgerät mit Überwachungsschaltung zum Erkennen des in einer Gasentladungslampe auftretenden Gleichrichteffekts

Publications (2)

Publication Number Publication Date
EP1322142A1 EP1322142A1 (fr) 2003-06-25
EP1322142B1 true EP1322142B1 (fr) 2006-04-12

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EP02022782A Expired - Lifetime EP1322142B1 (fr) 2001-12-20 2002-10-11 Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe

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EP (1) EP1322142B1 (fr)
AT (1) ATE323398T1 (fr)
DE (2) DE10163033A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357538B4 (de) * 2003-12-10 2014-08-28 Vossloh-Schwabe Deutschland Gmbh Vorschaltgerät mit verbesserter Lampenüberwachung
EP1878321B1 (fr) 2005-05-04 2010-04-07 STMicroelectronics Srl Systeme de commande pour lampe a decharge
DE102009055720A1 (de) * 2009-11-26 2011-06-01 Bag Engineering Gmbh Elektronisches Vorschaltgerät und Beleuchtungsgerät

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3626209A1 (de) * 1986-08-02 1988-02-04 Telefunken Electronic Gmbh Vorschaltgeraet fuer wenigstens eine entladungslampe
DE19619580A1 (de) * 1996-05-15 1997-11-20 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Sicherheitsabschaltung bei asymmetrischer Lampenleistung
US6005354A (en) * 1996-10-21 1999-12-21 International Rectifier Corporation Ballast IC with shut-down function
AU738151B2 (en) * 1997-12-23 2001-09-13 Tridonic Bauelemente Gmbh Process and device for the detection of the rectifier effect appearing in a gas discharge lamp
US6160361A (en) * 1998-07-29 2000-12-12 Philips Electronics North America Corporation For improvements in a lamp type recognition scheme

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Publication number Publication date
ATE323398T1 (de) 2006-04-15
DE50206374D1 (de) 2006-05-24
EP1322142A1 (fr) 2003-06-25
DE10163033A1 (de) 2003-07-03

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