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WO2008119376A1 - Montage de commande d'au moins une lampe fluorescente - Google Patents

Montage de commande d'au moins une lampe fluorescente Download PDF

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Publication number
WO2008119376A1
WO2008119376A1 PCT/EP2007/052997 EP2007052997W WO2008119376A1 WO 2008119376 A1 WO2008119376 A1 WO 2008119376A1 EP 2007052997 W EP2007052997 W EP 2007052997W WO 2008119376 A1 WO2008119376 A1 WO 2008119376A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
circuit arrangement
circuit
input
arrangement according
Prior art date
Application number
PCT/EP2007/052997
Other languages
German (de)
English (en)
Inventor
Jürgen Klier
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Priority to DE502007006528T priority Critical patent/DE502007006528D1/de
Priority to CN200780052228.3A priority patent/CN101637067B/zh
Priority to PCT/EP2007/052997 priority patent/WO2008119376A1/fr
Priority to AT07727469T priority patent/ATE498989T1/de
Priority to EP07727469A priority patent/EP2127499B1/fr
Publication of WO2008119376A1 publication Critical patent/WO2008119376A1/fr

Links

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

Definitions

  • Circuit arrangement for controlling at least one fluorescent lamp
  • the invention relates to a circuit arrangement for controlling at least one fluorescent lamp.
  • a possible cause of failure of fluorescent lamps is a reduced emissivity of the electrodes (so-called "end-of-life” effect). This effect occurs at the end of the life of a fluorescent lamp on one of the two electrodes. As a result, the discharge current through the lamp flows more easily in one direction than in the opposite direction.
  • the fluorescent lamp works in this case as a rectifier. In doing so, the emission-impoverished electrode heats up so much that high temperatures can occur at the lamp surface. In extreme cases, the glass bulb can melt in fluorescent lamps of small diameter.
  • An electronic ballast (ECG) to control the fluorescent lamp must detect this one such fault in time and either limit output current and output voltage to a non-critical value or turn off the fluorescent lamp.
  • WO 00/11916 uses as a detector two transistors whose base is connected to the emitter of the other transistor. The transistors determine a voltage window within which the detector does not become active. A problem in WO 00/11916 is the significant temperature coefficient of the base-emitter threshold, which affects the width of the voltage window, thus preventing sensitive adjustment of the circuit.
  • WO 97/43879 shows a circuit with two voltage comparators, which compare an input voltage with a fixed voltage window. Since the voltage at the coupling capacitor but not only depends on a possible rectification of the lamp, but also from the DC link voltage, deviations of the DC link voltage from the normal value can lead to false triggering. Such deviations occur when switching on the electronic ballast, but also in network interruptions, Netzunter- or network overvoltages and thus complicate a sensitive detector setting.
  • the object of the invention is to avoid the disadvantages mentioned above and in particular to specify a sensitive adjustable circuit arrangement with variably adjustable detection range.
  • a circuit arrangement for operating at least one fluorescent lamp comprising the following features: a half-bridge inverter with at least one downstream load circuit, at least one coupling capacitor, which is connected to the load circuit and to the half-bridge inverter,
  • the load circuit has connections for at least one fluorescent lamp
  • a detector circuit which compares a first voltage with a reference voltage and generates an output signal for driving the half-bridge inverter based on at least two comparators
  • the first voltage a voltage drop across the at least one coupling capacitor or a modified by a voltage divider
  • the detector circuit is constructed substantially symmetrical.
  • the detector circuit proposed in this case is particularly suitable for implementation in an integrated circuit because any tolerances of associated voltage divider resistors largely compensate each other. Another advantage is that for such an integrated solution, significantly higher sensitivity, i. a smaller detection window width can be set.
  • the predetermined value is in particular a normal value.
  • an embodiment is that the reference voltage a voltage drop across a further coupling capacitor or modified by a voltage divider Voltage drop corresponds to the other coupling capacitor.
  • a circuit arrangement is suitable for driving two fluorescent lamps.
  • a window width of the detector circuit is adjustable by an external signal.
  • the detector circuit preferably has a further connection via which the external signal is made available to the detector circuit.
  • a development consists in that the detector circuit comprises at least two voltage inputs and a voltage output, wherein - a first voltage input is connected to a reference voltage source,
  • a second voltage input is connected directly or via at least one resistor to a terminal of the at least one coupling capacitor and
  • the voltage output of the detector circuit is connected to the drive device of the half-bridge inverter.
  • the sensitivity of the detector circuit can be reduced by means of a resistor provided between the two voltage inputs of the detector circuit.
  • Another advantage is flexible usability of the detector circuit, in particular based on its symmetrical structure comprising the electrically equal voltage inputs.
  • the detector circuit comprises the following features: the first input is connected to a first voltage divider and to a positive input of a first comparator;
  • a tap of the first voltage divider is connected to a negative input of a second comparator
  • the second input is connected to a second voltage divider and to a positive input of the second comparator; - A tap of the second voltage divider is connected to a negative input of the first comparator;
  • An output of the first comparator is connected to an output of the second comparator and to the voltage output of the detector circuit.
  • the activation device comprises a shutdown device which switches off the half-bridge inverter when an abnormal operating state occurs.
  • the abnormal operating state may in particular be a fault of the fluorescent lamp.
  • the shutdown device can be implemented in the drive device, i. the
  • An embodiment consists in that the reference voltage is formed by a voltage divider which is connected in parallel to a DC voltage input of the half-bridge inverter, wherein the voltage divider has a tap at which the reference voltage is available.
  • Circuit arrangement in an electrical ballast is used and / or an electrical ballast comprises the described circuit.
  • circuit arrangement can be used for end-of-life detection and for switching off the fluorescent lamp.
  • Fig.l a circuit arrangement for operating a
  • 3 shows a detector circuit with three inputs
  • Fluorescent lamp with a detector circuit in which a window width is adjustable by means of an external signal
  • Fig.l shows a circuit arrangement for operating a fluorescent lamp LpIO comprising terminals 101, 102, 103 and 104.
  • a half-bridge inverter comprises an npn transistor QlO and an npn transistor QIl, wherein the emitter of the transistor Q10 is connected to the collector of the
  • Transistor QIl is connected. This center tap of the half-bridge inverter is designated by a node 105.
  • the node 105 is further connected to a coil L10 whose remaining terminal is connected to the terminal 101 of the fluorescent lamp LP10.
  • the collector of the transistor Q10 is connected to a supply voltage Vbus, the emitter of the Transistor QIl is connected to ground.
  • a capacitor ClO is connected in parallel with the fluorescent lamp LpIO to their terminals 102 and 104, and the terminal 103 of the fluorescent lamp LP10 is connected to ground through a capacitor C1l.
  • the circuit arrangement of Fig.l comprises a detector circuit Detl with inputs inl and in2, an output out, two comparators ComplO and Compll (each having a positive input, a negative input and an output) and resistors R13, R14, R16 and R17.
  • the terminal 103 of the fluorescent lamp LpIO is connected via a resistor RIO to the input inl, the input in2 is connected to the supply voltage Vbus via a resistor RIl.
  • the detector circuit Detl is constructed as follows: The positive input of the comparator ComplO is connected to the input inl. The input inl is connected to ground via a voltage divider comprising the resistors R13 and R16, the tap between the resistors R13 and R16 being connected to the negative input of the comparator Compl1. The input in2 is connected to the positive input of the comparator Compl1 and to ground via a voltage divider comprising the resistors R14 and R17. The tap between the resistors R14 and R17 is connected to the negative input of the comparator ComplO. The outputs of the comparators ComplO and Compll are connected to each other and to the output out of the detector circuit Detl.
  • a drive device Al is provided, which is driven via the output out of the detector circuit Detl and in turn connected to the respective base of the transistors QlO and QIl and this is activated or deactivated accordingly.
  • the transistors Q10 and Q11 are alternately switched by the drive device A1, so that the node 105 of the half-bridge inverter is alternately connected to the supply voltage Vbus and to the ground potential.
  • the capacitor CIl (also referred to as coupling capacitor) is ideally charged to half the supply voltage Vbus between the node 105 and the terminal 103 of the fluorescent lamp LpIO flows an alternating current whose frequency is determined essentially by a switching clock of the transistors QlO and QIl.
  • the alternating current flows through the two electrodes of the fluorescent lamp LpIO and the capacitor ClO (also referred to as resonance capacitor).
  • the ignition voltage for the fluorescent lamp LpIO is made available to the capacitor ClO, for example by an increase in resonance. After ignition of the discharge of the lamp LpIO the alternating current flows substantially over the discharge path of the lamp, the capacitor ClO is almost bypassed in this case.
  • the detector circuit Detl comprises a symmetrically constructed window comparator with the voltage dividers R13 / R16 and R14 / R17 and the comparators ComplO and Compll.
  • the (voltage) comparators ComplO and Compll respectively measure the voltage between one of the inputs inl and in2 and the center tap of the voltage divider connected to the other input in2 or inl.
  • the detector circuit is activated when the two input voltages at the inputs inl and in2 differ by more than one set sensitivity (half window width) regardless of their sign.
  • the drive device Al Upon activation of the detector circuit Detl, the drive device Al is preferably switched off.
  • the detector circuit allows detection of the shift of the voltage drop across the capacitor CIl in the positive or negative direction. If this shift is greater than a preset threshold value, an error case of the fluorescent lamp LpIO is detected, the detector circuit Detl sends a signal to the control device Al via the output out, which stops or activates the activation of the fluorescent lamp LpIO via the transistors Q10 and Q11 Driving the transistors QlO and QIl zufroid only a reduced current of the fluorescent lamp LpIO.
  • these are switched off or dangerous overheating of the fluorescent lamp can be effectively prevented.
  • the outputs of the comparators ComplO and Compll are of the "open collector" type and therefore can be interconnected to provide a corresponding OR combination of the respective output signals at the output out.
  • the window width is set via a divider ratio of the two voltage dividers, e.g.
  • the largest required sensitivity (smallest window width) is set. If necessary, this sensitivity can be reduced by a resistor arranged externally between the two inputs inl and in2.
  • a resistor arranged externally between the two inputs inl and in2.
  • FIG.l an electronic ballast for a fluorescent lamp LpIO is shown.
  • the voltage across the capacitor CIl is compared with the supply voltage Vbus.
  • a factor of 2 between the two voltages can be set by appropriate dimensioning of the series resistors:
  • detector circuit shows a circuit arrangement with two fluorescent lamps Lp20 and Lp21.
  • the structure of the circuit largely corresponds to Fig.l.
  • the detector circuit can be extended by one input in each case.
  • 3 shows an example of a detector circuit with three inputs in1, in2, in3 and an output out, comprising three comparators Comp30, Comp31, Comp32 and three voltage dividers R33 / R36, R34 / R37, R35 / R38.
  • the input inl is connected to the positive terminal of the comparator Comp30 and to the ground via the voltage divider R33 / R36.
  • the input in2 is connected to the positive terminal of the comparator Comp31 and to the ground via the voltage divider R34 / R37.
  • the input in3 is connected to the positive terminal of comparator Comp32 and to ground via voltage divider R35 / R38.
  • the center tap of the voltage divider R33 / R36 is connected to the negative terminal of the comparator Comp31.
  • the center tap of the voltage divider R34 / R37 is connected to the negative terminal of the comparator Comp32.
  • the center tap of the voltage divider R35 / R38 is connected to the negative terminal of the comparator Comp30.
  • Detector circuit Det4 in which the window width can be controlled by an external signal.
  • the wiring of the detector circuit Det4 largely corresponds to Fig.l, only the emitter of the transistor Q41 is now connected via a resistor R4 to ground and to an input B of the detector circuit Det4.
  • the detector circuit Det4 further comprises two inputs inl, in2, an output out, two comparators Comp40, Comp41 and four voltage dividers R42 / R46, R43 / R47, R44 / R48, R45 / R49.
  • the voltage divider R42 / R46 connects the input inl to the terminal B, the voltage divider R43 / R47 connects the input inl to ground, the voltage divider R44 / R48 connects the input in2 to the terminal B and the voltage divider R45 / R49 connects the input in2 Dimensions .
  • the center tap of the voltage divider R42 / R46 is connected to the negative input of the comparator Comp41.
  • the center tap of the voltage divider R43 / R47 is connected to the positive input of the comparator Comp40.
  • the center tap of the voltage divider R44 / R48 is connected to the negative input of the comparator Comp40.
  • the center tap of the voltage divider R45 / R49 is connected to the positive input of the comparator Comp41.
  • the window width is presently ⁇ 10%, with 10OmV control voltage ⁇ 5%.
  • a control signal depending on the lamp power (voltage across resistor R4) or lamp current, as shown here, will make the detector circuit more sensitive if needed.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

La présente invention concerne un montage de commande d'au moins une lampe fluorescente, le montage ayant les caractéristiques suivantes : (i) un onduleur demi-pont qui comprend au moins un circuit de charge connecté en aval; (ii) au moins un condensateur de couplage relié au circuit de charge et à l'onduleur demi-pont; (iii) un dispositif de commande destiné à l'onduleur demi-pont, le circuit de charge présentant des bornes de connexion destinées à la lampe fluorescente; (iv) un circuit de détection qui compare une première tension à une tension de référence et produit au moyen de deux comparateurs un signal de sortie destiné à commander l'onduleur demi-pont, la première tension correspondant à une chute de tension aux bornes du ou des condensateurs de couplage ou à une chute de tension aux bornes du ou des condensateurs, modifiée par un diviseur de tension.
PCT/EP2007/052997 2007-03-29 2007-03-29 Montage de commande d'au moins une lampe fluorescente WO2008119376A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE502007006528T DE502007006528D1 (de) 2007-03-29 2007-03-29 Schaltungsanordnung zur ansteuerung mindestens einer leuchtstofflampe
CN200780052228.3A CN101637067B (zh) 2007-03-29 2007-03-29 用于激励至少一个荧光灯的电路装置
PCT/EP2007/052997 WO2008119376A1 (fr) 2007-03-29 2007-03-29 Montage de commande d'au moins une lampe fluorescente
AT07727469T ATE498989T1 (de) 2007-03-29 2007-03-29 Schaltungsanordnung zur ansteuerung mindestens einer leuchtstofflampe
EP07727469A EP2127499B1 (fr) 2007-03-29 2007-03-29 Montage de commande d'au moins une lampe fluorescente

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/052997 WO2008119376A1 (fr) 2007-03-29 2007-03-29 Montage de commande d'au moins une lampe fluorescente

Publications (1)

Publication Number Publication Date
WO2008119376A1 true WO2008119376A1 (fr) 2008-10-09

Family

ID=38686674

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/052997 WO2008119376A1 (fr) 2007-03-29 2007-03-29 Montage de commande d'au moins une lampe fluorescente

Country Status (5)

Country Link
EP (1) EP2127499B1 (fr)
CN (1) CN101637067B (fr)
AT (1) ATE498989T1 (fr)
DE (1) DE502007006528D1 (fr)
WO (1) WO2008119376A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010081571A3 (fr) * 2009-01-16 2011-01-06 Osram Gesellschaft mit beschränkter Haftung Circuit de détection et procédé d'excitation d'une lampe fluorescente

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043879A1 (fr) 1996-05-10 1997-11-20 Philips Electronics N.V. Source d'alimentation pour alimenter et allumer une lampe a decharge a gaz
WO2000011916A1 (fr) 1998-08-20 2000-03-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour faire fonctionner au moins une lampe a decharge
US6400095B1 (en) * 1997-12-23 2002-06-04 Tridonic Bauelemente Gmbh Process and device for the detection of the rectifier effect appearing in a gas discharge lamp
EP1233657A2 (fr) * 2001-02-20 2002-08-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit de protection pour tube fluorescent
DE202005013675U1 (de) 2005-08-30 2005-12-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH EVG für Entladungslampen mit EoL Überwachungsschaltung
WO2006117809A1 (fr) * 2005-05-04 2006-11-09 Stmicroelectronics S.R.L. Systeme de commande pour lampe a decharge

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1794894B (zh) * 2004-12-25 2011-03-30 鸿富锦精密工业（深圳）有限公司 冷阴极荧光灯驱动装置
CN2795894Y (zh) * 2005-05-19 2006-07-12 上海联能科技有限公司 冷阴极荧光灯驱动电路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997043879A1 (fr) 1996-05-10 1997-11-20 Philips Electronics N.V. Source d'alimentation pour alimenter et allumer une lampe a decharge a gaz
US6400095B1 (en) * 1997-12-23 2002-06-04 Tridonic Bauelemente Gmbh Process and device for the detection of the rectifier effect appearing in a gas discharge lamp
WO2000011916A1 (fr) 1998-08-20 2000-03-02 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour faire fonctionner au moins une lampe a decharge
EP1233657A2 (fr) * 2001-02-20 2002-08-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit de protection pour tube fluorescent
WO2006117809A1 (fr) * 2005-05-04 2006-11-09 Stmicroelectronics S.R.L. Systeme de commande pour lampe a decharge
DE202005013675U1 (de) 2005-08-30 2005-12-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH EVG für Entladungslampen mit EoL Überwachungsschaltung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010081571A3 (fr) * 2009-01-16 2011-01-06 Osram Gesellschaft mit beschränkter Haftung Circuit de détection et procédé d'excitation d'une lampe fluorescente
US8754582B2 (en) 2009-01-16 2014-06-17 Osram Gesellschaft Mit Beschraenkter Haftung Detector circuit and method for actuating a fluorescent lamp

Also Published As

Publication number Publication date
DE502007006528D1 (de) 2011-03-31
EP2127499B1 (fr) 2011-02-16
CN101637067B (zh) 2013-06-19
ATE498989T1 (de) 2011-03-15
EP2127499A1 (fr) 2009-12-02
CN101637067A (zh) 2010-01-27

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