EP2140735B1 - Ensemble circuit servant à amorcer et à faire fonctionner au moins une lampe à décharge - Google Patents

Ensemble circuit servant à amorcer et à faire fonctionner au moins une lampe à décharge Download PDF

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Publication number
EP2140735B1
EP2140735B1 EP07728402A EP07728402A EP2140735B1 EP 2140735 B1 EP2140735 B1 EP 2140735B1 EP 07728402 A EP07728402 A EP 07728402A EP 07728402 A EP07728402 A EP 07728402A EP 2140735 B1 EP2140735 B1 EP 2140735B1
Authority
EP
European Patent Office
Prior art keywords
coupled
circuit
transistor
auxiliary transistor
secondary winding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07728402A
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German (de)
English (en)
Other versions
EP2140735A1 (fr
Inventor
Bernd Rudolph
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Osram GmbH
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Publication date
Application filed by Osram GmbH filed Critical Osram GmbH
Publication of EP2140735A1 publication Critical patent/EP2140735A1/fr
Application granted granted Critical
Publication of EP2140735B1 publication Critical patent/EP2140735B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the present invention relates to a circuit arrangement for igniting and 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 main transistor in a half-bridge arrangement, which is coupled in series between the first and the second input terminal a first and a second output terminal for connecting the at least one discharge lamp, at least one lamp inductor coupled in series with the first output terminal, at least one output capacitor coupled in parallel with the first and second output terminals, a transformer having a primary winding and a first one and a second secondary winding, wherein a series circuit comprising the primary winding and the at least one lamp inductor is coupled between the half-bridge center and a reference potential; and a first control circuit for driving the first main transistor and a second control circuit for driving the second main transistor, wherein each control circuit has an input and an output, wherein the output of the first control circuit to the control electrode of the first main transistor and the output of the second control circuit to the control electrode the second
  • the frequency-dependent voltage divider of each time circuit comprises an ohmic resistance and a capacitor, wherein the voltage dropping across the capacitor is coupled to the control path of the first auxiliary transistor.
  • Zener diodes are provided which are used as relatively accurate thresholds for generating the blanking voltage for the discharge lamp, ie the voltage available across the lamp for ignition.
  • the current-limiting effect of the lamp choke is due to a possible saturation back, whereby the main transistors of the inverter can be destroyed. It should be noted, however, that operation of the lamp choke with light saturation is desirable because this results in low losses. Exactly at the point makes an increase in tolerances then negatively noticeable, since thereby the danger the saturation of the lamp choke is created. As a result, this would result in a reduction of the control losses in a greater dimensioning of the components of the circuit arrangement and thus in higher costs.
  • the present invention is therefore based on the object, the above-mentioned circuit arrangement such that a reduction of tax losses without risk of destruction of the main transistors of the inverter or without necessity, the main transistors of the inverter is more strongly dimensioned.
  • the present invention is based on the finding that a disadvantage of the prior art is that the capacitor of the frequency-dependent voltage divider is also problematic because it acts as an energy store at the control electrode of the first auxiliary transistor and thus by its charge and discharge an undesirable delay the voltage at the control electrode of the first auxiliary transistor relative to the current in the control electrode of the main transistor is formed.
  • the frequency-dependent voltage divider is realized in an inventive circuit arrangement by an inductor and a resistor, wherein the voltage dropping across the ohmic resistor is coupled to the control path of the first auxiliary transistor.
  • the Z-diodes affected by the above-mentioned disadvantages are replaced by a second Auxiliary transistor is connected in parallel with the inductance of the frequency-dependent voltage divider, wherein the second auxiliary transistor comprises a drive circuit which is designed to bridge the associated inductance in dependence on the voltage at the associated secondary winding by the second auxiliary transistor.
  • transistors used for the second auxiliary transistor usually switch at a voltage of 0.6 to 0.7V on the control path, that is, at such a voltage between the control and reference electrodes, whereas the already mentioned above Z-diode voltages by a factor of 10 over.
  • a preferred embodiment is characterized in that the second mentioned measure according to the invention, ie the measure which provides a second auxiliary transistor, which is connected in parallel with the associated inductance, is provided only in one of the two time circuits. This is particularly possible in load circuits of low operating quality, in which the difference between the ignition frequency and operating frequency is low and in which the lamp inductor is operated only slightly saturated when ignited.
  • the at least one second auxiliary transistor comprises a control electrode, a working electrode and a reference electrode, wherein the working electrode is coupled to the point of the associated voltage divider, at which the inductance is coupled to the ohmic resistance, wherein the reference electrode with the associated second Secondary winding is coupled.
  • the at least one timing circuit further comprises a current measuring resistor which is serially coupled between the associated secondary winding and the output of the associated timing circuit, wherein the voltage dropping across the current sensing resistor is coupled to the control electrode of the associated second auxiliary transistor.
  • the voltage which switches the second auxiliary transistor on and off is made dependent on the current in the control electrode of the respective main transistor.
  • a first further ohmic resistance is coupled between the working electrode of the at least one second auxiliary transistor and the point of the associated voltage divider, at which the inductance is coupled to the ohmic resistance.
  • An ohmic resistor provided at this point acts as a current limiting resistor and thus ensures that the current driven by the transformer continues to flow essentially through the current measuring resistor and thus keeps the second auxiliary transistor safely open.
  • a capacitor is coupled between the point at which the inductance of the respective voltage divider is coupled to the respective secondary winding, and the respective inductance.
  • a second further ohmic resistance is coupled between the current measuring resistor and the output of the associated timing circuit.
  • the figure shows a circuit arrangement according to the invention and a supply arrangement for this circuit arrangement and two lamps which are ignited or fed by means of this circuit arrangement.
  • the supply arrangement comprises two input terminals 1 and 2, which are intended for connection to an AC voltage source.
  • a rectifier bridge 3 with four diodes (4 to 7 inclusive) is connected.
  • a filter between the input terminals 1 and 2 on the one hand, and the rectifier bridge 3 on the other hand, may be provided.
  • An output terminal of the rectifier bridge 3 is connected to a first input terminal A of the circuit arrangement.
  • a second output terminal of the rectifier bridge 3 is connected to an input terminal B of the circuit arrangement.
  • the terminals A and B are connected by a capacitor 10 and also by a series connection of a first main transistor 11, a primary winding 12 of a current transformer and a load circuit 13, the details of which are listed below, and a capacitor 14.
  • the load circuit 13 comprises two substantially equal, parallel branches. Each of these branches comprises a discharge lamp 15 or 15 ', connected in series with a lamp choke 16 or 16'.
  • Each of the lamps 15, 15 ' has two preheatable electrodes. Belonging to a lamp 15, 15 'remote from a supply source electrode ends are connected by an output capacitor 17 and 17' to each other.
  • Each of these output capacitors 17, 17 'therefore represents a circuit element connected in parallel with the relevant lamp 15, 15'.
  • the series connection of the primary winding 12 of the transformer, the load circuit 13 and the capacitor 14 is connected in parallel with a second main transistor 20.
  • Each of the two main transistors 11 and 20 is of the NPN type.
  • the collector of the main transistor 11 is connected to the positive input terminal A of the circuit arrangement.
  • the emitter of this main transistor 11 is connected to the collector of the main transistor 20.
  • the emitter of this main transistor 20 is connected to the negative input terminal B of the circuit arrangement.
  • current negative feedback resistors in particular emitter resistors, may be provided for the main transistors 11 and 20.
  • the main transistors 11 and 20 in half-bridge arrangement is defines a half-bridge center HM.
  • the current transformer having the primary winding 12 has two secondary windings 30 and 31, respectively.
  • the secondary winding 30 is connected to a control circuit of the main transistor 11.
  • the secondary winding 31 is connected to a control circuit of the main transistor 20.
  • the control circuits are substantially similar to each other.
  • the ends of the secondary winding 30 are connected to each other via a diode 40 and a timing circuit comprising a series circuit of a capacitor 32, an inductor 33 and an ohmic resistor 34.
  • the timing circuit further comprises a first auxiliary transistor 35 whose base is connected to the connection point between the capacitor 32 and the inductor 33 on the one hand and the ohmic resistor 34 on the other.
  • a second auxiliary transistor 38 is provided, whose collector-emitter path is connected in parallel with a series resistor ohmic resistance 39 of the series circuit of capacitor 32 and inductance 33 arranged in parallel therewith.
  • an ohmic resistor 36 is connected, which serves as a current measuring resistor.
  • a second further ohmic resistor 37 is connected in series between the ohmic resistor 36 and the base of the main transistor 11.
  • a corresponding timing circuit 32 'to 40' connects the ends of the secondary winding 31 with each other.
  • a diode 50 is connected in anti-parallel to the main transistor 11.
  • a diode 50 ' is connected in anti-parallel to the main transistor 20.
  • Parallel to the main transistor 11 is still an ohmic resistor 51 and a capacitor 52 connected.
  • a circuit for starting the circuit comprises inter alia a series connection of a resistor 60 and a capacitor 61, which is connected in parallel with the capacitor 10.
  • a connection point between the resistor 60 and the capacitor 61 is connected to a bi-directional threshold element 62, in the present case a DIAC.
  • the other side of this threshold element 62 is connected via a resistor 63 to a point between the resistor 36 'and the diode 40' of the control circuit of the main transistor 20.
  • the node between the resistor 60 and the capacitor 61 is also connected to a diode 64.
  • the other side of this diode 64 is connected via a resistor 65 to the collector of the main transistor 20.
  • the circuit described operates as follows:
  • the terminals 1 and 2 are connected to an AC voltage of, for example, 230 V, 50 Hz.
  • a DC voltage is applied through the rectifier bridge 3 between the terminals A and B of the circuit arrangement. Consequently, current first flows from A through resistor 51, primary winding 12 of the current transformer, load circuit 13, and capacitor 14 to terminal B, causing the output capacitors 17, 17 'and capacitor 14 to charge.
  • the capacitor 61 is charged via the resistor 60.
  • the threshold voltage of the threshold element 62 is then reached, the capacitor 61 becomes, inter alia, via the resistors 63, 36 ', 37' and the base-emitter junction of the main transistor 20 discharged.
  • This discharge process ensures that the main transistor 20 becomes conductive for the first time.
  • the capacitor 14 in the circuit 14, 13, 12, 20, 14 is discharged. Since this discharge current also flows through the primary winding 12 of the current transformer, voltages in the two secondary windings 30 and 31 are induced. The induced voltage in the winding 31 has a sense of direction holding the main transistor 20 in a conducting state.
  • the elements 32 ', 33', 34 'of the timing circuit turn on the first auxiliary transistor 35' after elapse of a predetermined period of time. As a result, the main transistor 20 becomes non-conductive.
  • the current of the load circuit 13 then flows through the combination of the diode 50 and the capacitor 52 and through the capacitor 10 back to the capacitor 14.
  • the lamps 15, 15 ' are then not ignited.
  • the load circuit 13 in this case comprises a parallel connection of two practically identical branches, each of which consists of a series connection of a lamp inductor 16 and an output capacitor 17 (or 16 'and 17'). This circuit is not attenuated by the lamps 15, 15 '. Without the presence of the second auxiliary transistors 38 and 38 'in the timing circuits, the frequency of the current flowing through the load circuit 13 would be set practically at the resonant frequency of that circuit. As a result, such great voltages would be applied to the lamps 15 and 15 'that they would ignite with cold cathodes. In the case of defective lamps, this could also lead to an electrically inadmissible situation in the circuit 13 due to very high currents.
  • the time constant of the timing is influenced, in this case, by the fact that the series circuit of capacitor 32 and inductor 33 and 32 'and 33' is bridged by the ohmic resistor 39.
  • the voltage across the ohmic resistor 34 or 34 ' more quickly reaches the value at which the auxiliary transistor 35 or 35' becomes conductive, with the result that the associated main transistor 11 or 20 becomes nonconductive more rapidly. This causes the frequency of the circuit arrangement to reach a higher value.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (6)

  1. Circuit pour amorcer et faire fonctionner au moins une lampe à décharge (15, 15'), comportant
    - une première connexion d'entrée (A) et une deuxième connexion d'entrée (B) pour connecter une tension d'alimentation ;
    - un onduleur qui comprend au moins un premier transistor principal (11) et un deuxième transistor principal (20) en demi-pont, lesquels sont couplés en série entre la première connexion d'entrée (A) et la deuxième connexion d'entrée (B) ;
    - une première et une deuxième connexions de sortie pour connecter l'au moins une lampe à décharge (15, 15') ;
    - au moins une lampe bobine (16, 16') qui est couplée en série à la première connexion de sortie ;
    - au moins un condensateur de sortie (17, 17') qui est couplé en parallèle avec la première et la deuxième connexions de sortie ;
    - un transformateur avec un enroulement primaire (12) et un premier enroulement secondaire (30) et un deuxième enroulement secondaire (31), un montage en série qui comprend l'enroulement primaire (12) et l'au moins une lampe bobine (16, 16') étant couplé entre le point central du demi-pont (HM) et un potentiel de référence ; et
    - un premier circuit de commande pour commander le premier transistor principal (11) et un deuxième circuit de commande pour commander le deuxième transistor principal (20), chaque circuit de commande comportant une entrée et une sortie, la sortie du premier circuit de commande étant couplée à l'électrode de commande du premier transistor principal (11) et la sortie du deuxième circuit de commande étant couplée à l'électrode de commande du deuxième transistor principal (20), l'entrée du premier circuit de commande étant couplée au premier enroulement secondaire (30) et l'entrée du deuxième circuit de commande étant couplée au deuxième enroulement secondaire (31), chaque circuit de commande comportant un circuit d'horloge (32 à 40 ; 32' à 40') dont la constante de temps varie en fonction de la tension appliquée à l'entrée du circuit de commande respectif, chaque circuit d'horloge (32 à 40 ; 32' à 40') comportant au moins un premier transistor auxiliaire (35 ; 35'), l'électrode de travail du premier transistor auxiliaire (35 ; 35') étant couplée à l'électrode de commande du transistor principal associé (11 ; 20) et l'électrode de référence du premier transistor auxiliaire (35 ; 35') étant couplée à un potentiel de référence, l'électrode de commande du premier transistor auxiliaire (35 ; 35') étant couplée au point central d'un diviseur de tension dépendant de la fréquence qui est couplé, d'une part, à l'enroulement secondaire respectif (30 ; 31) et, d'autre part, au potentiel de référence respectif,
    caractérisé en ce que le diviseur de tension, dépendant de la fréquence, de chaque circuit d'horloge (32 à 40 ; 32' à 40') comprend au moins une inductance (33 ; 33') et une résistance ohmique (34 ; 34'), la tension en chute au niveau de la résistance ohmique (34 ; 34') étant couplée au trajet de commande du premier transistor auxiliaire (35 ; 35'), au moins un circuit d'horloge (32 à 40 ; 32' à 40') comprenant un deuxième transistor auxiliaire (38 ; 38') qui est monté en parallèle avec l'inductance associée (33 ; 33'), le deuxième transistor auxiliaire (38 ; 38') comprenant un circuit de commande qui est conçu pour shunter l'inductance associée (33 ; 33') en fonction de la tension au niveau de l'enroulement secondaire associé (30 ; 31) au moyen du deuxième transistor auxiliaire (38 ; 38').
  2. Circuit selon la revendication 1, caractérisé en ce que l'au moins un deuxième transistor auxiliaire (38 ; 38') comporte une électrode de commande, une électrode de travail et une électrode de référence, l'électrode de travail étant couplée au point du diviseur de tension associé au niveau duquel l'inductance (33 ; 33') est couplée à la résistance ohmique (34 ; 34'), l'électrode de référence étant couplée au deuxième enroulement secondaire associé (30 ; 31).
  3. Circuit selon l'une des revendications 1 ou 2, caractérisé en ce que l'au moins un circuit d'horloge (32 à 40 ; 32' à 40') comprend en outre une résistance de mesure de courant qui est couplée en série entre l'enroulement secondaire associé (30 ; 31) et la sortie du circuit d'horloge associé (32 à 40 ; 32' à 40'), la tension en chute au niveau de la résistance de mesure de courant (36 ; 36') étant couplée à l'électrode de commande du deuxième transistor auxiliaire associé (38 ; 38').
  4. Circuit selon l'une des revendications précédentes, caractérisé en ce qu'une première autre résistance ohmique (39 ; 39') est couplée entre l'électrode de travail de l'au moins un deuxième transistor auxiliaire (38 ; 38') et le point du diviseur de tension associé au niveau duquel l'inductance (33 ; 33') est couplée à la résistance ohmique (34 ; 34').
  5. Circuit selon l'une des revendications précédentes, caractérisé en ce qu'un condensateur (32 ; 32') est couplé entre le point au niveau duquel l'inductance (33 ; 33') du diviseur de tension respectif dépendant de la fréquence est couplée à l'enroulement secondaire respectif (30 ; 31) et l'inductance respective (33 ; 33').
  6. Circuit selon l'une des revendications précédentes, caractérisé en ce qu'une deuxième autre résistance ohmique (37 ; 37') est couplée entre la résistance de mesure de courant (36 ; 36') et la sortie du circuit d'horloge associé (32 à 40 ; 32' à 40').
EP07728402A 2007-04-23 2007-04-23 Ensemble circuit servant à amorcer et à faire fonctionner au moins une lampe à décharge Not-in-force EP2140735B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/053945 WO2008128574A1 (fr) 2007-04-23 2007-04-23 Ensemble circuit servant à amorcer et à faire fonctionner au moins une lampe à décharge

Publications (2)

Publication Number Publication Date
EP2140735A1 EP2140735A1 (fr) 2010-01-06
EP2140735B1 true EP2140735B1 (fr) 2011-04-20

Family

ID=38375674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728402A Not-in-force EP2140735B1 (fr) 2007-04-23 2007-04-23 Ensemble circuit servant à amorcer et à faire fonctionner au moins une lampe à décharge

Country Status (6)

Country Link
US (1) US8076864B2 (fr)
EP (1) EP2140735B1 (fr)
CN (1) CN101641999B (fr)
AT (1) ATE506835T1 (fr)
DE (1) DE502007007030D1 (fr)
WO (1) WO2008128574A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6554888B2 (ja) * 2015-04-15 2019-08-07 富士電機株式会社 スイッチング電源装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469028A (en) * 1978-03-20 1995-11-21 Nilssen; Ole K. Electronic ballast drawing sinusoidal line current
NL8201631A (nl) * 1982-04-20 1983-11-16 Philips Nv Gelijkstroom-wisselstroomomzetter voor het ontsteken en met wisselstroom voeden van een gas- en/of dampontladingslamp.
NL8402351A (nl) * 1984-07-26 1986-02-17 Philips Nv Gelijkstroom-wisselstroomomzetter voor het voeden van een metaaldampontladingsbuis.
NL8500155A (nl) * 1985-01-22 1986-08-18 Philips Nv Elektrische inrichting voor het regelen van de lichtsterkte van althans een ontladingslamp.
EP0759265B1 (fr) * 1995-03-10 2001-10-31 Koninklijke Philips Electronics N.V. Dispositif de commutation
WO2000024233A2 (fr) * 1998-10-16 2000-04-27 Electro-Mag International, Inc. Circuit regulateur
DE19905487A1 (de) * 1999-02-11 2000-08-31 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb mindestens einer Niederdruckentladungslampe
WO2002047441A1 (fr) * 2000-12-04 2002-06-13 Koninklijke Philips Electronics N.V. Agencement de circuit de ballast
JP2005183291A (ja) * 2003-12-22 2005-07-07 Matsushita Electric Works Ltd 放電灯点灯装置、及び照明器具

Also Published As

Publication number Publication date
CN101641999B (zh) 2013-02-06
US8076864B2 (en) 2011-12-13
WO2008128574A1 (fr) 2008-10-30
ATE506835T1 (de) 2011-05-15
DE502007007030D1 (de) 2011-06-01
US20100033104A1 (en) 2010-02-11
EP2140735A1 (fr) 2010-01-06
CN101641999A (zh) 2010-02-03

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