EP0797377B1 - Circuit inverseur à pont amélioré pour lampes à décharge - Google Patents

Circuit inverseur à pont amélioré pour lampes à décharge Download PDF

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Publication number
EP0797377B1
EP0797377B1 EP97103848A EP97103848A EP0797377B1 EP 0797377 B1 EP0797377 B1 EP 0797377B1 EP 97103848 A EP97103848 A EP 97103848A EP 97103848 A EP97103848 A EP 97103848A EP 0797377 B1 EP0797377 B1 EP 0797377B1
Authority
EP
European Patent Office
Prior art keywords
circuit
lamp
turn
current path
sak
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.)
Expired - Lifetime
Application number
EP97103848A
Other languages
German (de)
English (en)
Other versions
EP0797377A1 (fr
Inventor
Thomas Dr. Siegmund
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0797377A1 publication Critical patent/EP0797377A1/fr
Application granted granted Critical
Publication of EP0797377B1 publication Critical patent/EP0797377B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • 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 a method and a Circuit for stabilizing the known half-bridge control in electronic circuits for the operation of Fluorescent lamps.
  • These fluorescent lamps are about so-called EVG, which are electronic ballasts, operated, which are arranged between the network and the lamp. It is a circuit with active and passive components that are used for ignition, current limiting, operation, safety shutdown and shutdown in general etc. and work in the high frequency range.
  • Luminaire housing leads to the advantageous density Assembly of the circuit boards, for example in a stack, if sufficient cooling is available.
  • the disadvantage the dense and compact arrangement of the circuits lies in the risk of mutual interference due to coupling processes. These are mainly due to the strong stray fields caused by the depending in the individual circuits Lamp chokes are out.
  • the outside a field circuit of the stray field especially with lamp chokes with a continuous outside lying air gap is corresponding during an ignition process the maximum current flow through the choke. This can lead to a not switched on, but even Individual lamp removed from the mains by a safety shutdown the lamp starts to ignite again unintentionally.
  • the half-bridge circuits are through an induction element connected to each other with a common core, by which the primary winding in the lamp current path and two secondary windings each in a control circuit of the switching elements of the respective half-bridge. At least one of the secondary windings one in the lamp current path Inductance, the induced interference voltage is derived and rectified via a diode. This in the intensity of high rectified dependent on the captured disturbance Electricity is supplied both to a capacity and to Supplying a safety shutdown circuit used which thereby activating a shutdown element. This makes one of Dependent and reliable on the intensity of the interference Operating mode of the circuit arrangement affected by the interference ensured.
  • FIG. 1 shows partly as a block diagram, partly in one detailed linking of examples that can actually be used Components the essential part according to the invention of the present invention.
  • a power supply the circuit and the lamp L omitted and the conventional circuits of a safety shutdown SAK and an electronic control circuit VS for preheating the filament is shown only as a block.
  • the voltages + UB1 and + UB2 are available from the power supply (not shown).
  • the lamp L receives an ignition and operating voltage, which is obtained from + UB2 against ground.
  • a lamp current path L a leads from a half-bridge center M to the hot end H of the lamp L and this to the circuit ground point Mp.
  • the high-frequency supply of the lamp L takes place via two half-bridge branches.
  • One half-bridge here called “upper” half-bridge, receives its supply voltage + UB2 from the power supply unit, not shown, and is constructed in a conventional manner with a bipolar npn transistor Q1.
  • the series resistors R 4 , R 7 and R 8 are low-resistance ME sheet resistors.
  • the second half-bridge here called “lower” half-bridge, has a transistor Q2 of the same type as transistor Q1 and is fed via the half-bridge or switching center M.
  • the safety shutdown circuit with a transistor Q5 in the present example is supplied by + UB1 via a resistor R 1 (for example 1M ⁇ ) and a capacitance C 5 essential to the invention (for example with 680 nF).
  • the resistor R 1, a Zener diode Z 4 and a diode D 9 lie one after the other in the path between the supply UB1 and the half-bridge center.
  • the lower half-bridge branch is triggered via a diode with symmetrical, non-controllable breakdown behavior, a DIAC DI.
  • the base circuit is supplied by transistor Q 2 via the DIAC DI in series with Zener diode Z 4 from capacitance C 5 and voltage source UB 1 in series with resistor R 1 .
  • a diode D 12 connects as an essential component of the invention, which is connected to the safety shutdown circuit SAK and the capacitance C. 5 is connected.
  • the two half-bridge transistors Q1 and Q2 each receive a diode D 4 or D 5 connected antiparallel to enable the choke circuit to run freely in the lamp circuit La.
  • the safety shutdown circuit SAK is connected via a resistor R 23 and a shutdown transistor Q7 to the base circuit of the transistor Q2. Finally, there is a connection between the hot end H of the lamp L and the safety shutdown circuit.
  • a resonance capacitance C 6 is arranged parallel to the lamp L and on the inside thereof.
  • the essential for the operation of the circuit described above is that the lower half-bridge transistor Q2 is controlled via the winding RK c of the toroidal choke. Interference from the primary winding a in the lamp circuit causes an interference voltage to occur on the winding c on the secondary side. This voltage affects the circuit components that drive the turn-off transistor Q7.
  • the diode D 12 additionally inserted into the circuit according to the invention rectifies the function of the voltage induced on the winding RK c on the secondary side and feeds an additional current into the capacitance C 5 and thus contributes to the additional supply of the circuit components of the safety shutdown.
  • High-frequency interference voltages coupled in from the outside due to the low lamp resistance in normal Operation in the system is greatly damped and therefore have only a minor impact Influence on the system of electronic circuit and lamp, that could disrupt the operation.
  • the shutdown transistor Q7 is controlled by the safety shutdown circuit SAK.
  • the result is a low resistance connection between the base of transistor Q2 and the ground.
  • the thereby removed control of the "lower" half-bridge transistor Q2 allows the oscillation process to end.
  • the capacitance C 5 discharges to about 1.5 volts.
  • the high-frequency interference coupled in from the outside via feed lines or adjacent lamp chokes causes an interference voltage induced on the winding RK c .
  • This interference voltage is present on the diode D 12 .
  • the voltage rectified by diode D 12 will be greater than the voltage normally present at capacitor D 5 .
  • the diode D 12 conducts and supplies an additional current to supply the components of the safety shutdown circuit SAK.
  • the shutdown transistor Q7 receives a stronger base current control from the safety shutdown circuit SAK and thus has a more damping effect on the control of the transistor Q2.
  • the greater the energy coupling due to a fault the more energy is fed into the shutdown, the more the transistor Q7 is driven.
  • the high-frequency energy coupled into the lamp circuit from outside is diverted by the diode D 12 regardless of the type and strength of the coupling and regardless of whether it comes from one or more neighboring sources of interference and is used to supply the circuit components of the safety shutdown circuit SAK.
  • FIGS. 2 and 3 show the voltage profiles measured at the capacitance C 5 on a test setup of two adjacent electronic ballasts.
  • the voltage curve according to FIG. 2a shows the high-frequency coupling via the lamp choke LD into a switched-off second electronic ballast EVG2 not constructed according to the invention by an adjacent electronic ballast EVG1 which is in the “preheating / ignition” operating state.
  • the upper curve is the measured ignition voltage curve U v in the device EVG1 that is just switched on.
  • the middle curve shows the corresponding preheating current I v in the EVG1 device.
  • the voltage curve according to FIG. 2b shows the high-frequency coupling via the lamp choke LD into a switched-off second electronic ballast EVG2 constructed according to the invention by an adjacent electronic ballast EVG1, which is in the “preheating / ignition” operating state.
  • the safety shutdown according to the invention remains effective with the same interference voltage.
  • the voltage at C 5 remains lower.
  • the voltage curve according to FIG. 3a shows the high-frequency coupling via the lamp choke LD into a switched-off second electronic ballast EVG2 not constructed according to the invention by an adjacent electronic ballast EVG1 which is in the “ignition without preheating” operating state.
  • the preheating cannot take place, for example, because a heating coil is broken.
  • this malfunction also triggers an excessive rise in the voltage across the capacitance C 5 due to the safety shutdown becoming ineffective.
  • the voltage curve according to FIG. 3b shows the high-frequency coupling via the lamp choke LD into a switched-off second electronic ballast EVG2 constructed according to the invention by an adjacent electronic ballast EVG1 which, as before, is in the “ignition without lamp” operating state.
  • the circuit according to the invention has no influence on the operating state of the safety shutdown without consequences and the excessive voltage increase in the capacitance C 5 .

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (8)

  1. Procédé de stabilisation d'une commande en demi-pont et d'un circuit (SAK) d'arrêt de sécurité du fonctionnement de lampes fluorescentes vis-à-vis de couplages étrangers, caractérisé en ce que des tensions parasites à haute fréquence injectées sont prélevées au moins par un enroulement secondaire (RKc) d'une inductance se trouvant par son enroulement (RKa) primaire dans le trajet (La) du courant de la lampe et sont redressées, cette tension redressée étant appliquée en même temps à une capacité (C5) et assurant, par l'intermédiaire du circuit (SAK) d'arrêt de sécurité, la commande d'un élément (Q7) d'arrêt.
  2. Montage (EVG) électronique pour faire fonctionner des lampes (L) fluorescentes à partir du réseau, comprenant un circuit (SAK) d'arrêt de sécurité, ainsi qu'une commande par deux branches en demi-pont qui sont couplées par l'intermédiaire d'une inductance à un trajet (La) de courant de lampe, par laquelle est monté un enroulement (RKa) primaire dans le trajet (La) de courant de lampe et respectivement un enroulement (RKc,b) secondaire dans la branche de demi-pont correspondante, caractérisé en ce qu'au moins un enroulement (RKc) secondaire est relié par l'intermédiaire d'une diode (D12) à la fois à une capacité (C5) et par l'intermédiaire du circuit d'arrêt de sécurité à un élément (Q7) d'arrêt.
  3. Montage suivant la revendication 2, caractérisé en ce que l'inductance se trouvant dans le trajet (La) de courant de lampe est une bobine de lampe (LD) ayant deux enroulements (b, c) auxiliaires.
  4. Montage suivant la revendication 2, caractérisé en ce que l'inductance se trouvant dans le trajet (La) de courant de lampe est un transformateur (RKa) de courant et une bobine (LD) de lampe montés en série.
  5. Montage suivant la revendication 4, caractérisé en ce que le transformateur (RK) de courant comporte un noyau annulaire ayant trois enroulements (a, b, c).
  6. Montage suivant la revendication 2, caractérisé en ce que l'élément (Q7) d'arrêt est un transistor.
  7. Montage suivant la revendication 2, caractérisé en ce que l'élément (Q7) d'arrêt est un interrupteur à semi-conducteur intégré.
  8. Montage suivant l'une ou plusieurs des revendications 2 à 7 précédentes, caractérisé en ce que les enroulements (RKb,c) secondaires, dans chaque circuit de courant de commande des transistors, sont disposés dans la branche en demi-pont et la diode (D12) de redressement de la tension parasite injectée relie l'extrémité d'un enroulement (RKc) secondaire qui est tourné vers l'électrode de commande du transistor (Q2) qui lui correspond au circuit (SAK) d'arrêt de sécurité et à la capacité (C5).
EP97103848A 1996-03-22 1997-03-07 Circuit inverseur à pont amélioré pour lampes à décharge Expired - Lifetime EP0797377B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19611417 1996-03-22
DE19611417A DE19611417A1 (de) 1996-03-22 1996-03-22 Verbesserte Halbbrückenansteuerung von Leuchtstofflampen

Publications (2)

Publication Number Publication Date
EP0797377A1 EP0797377A1 (fr) 1997-09-24
EP0797377B1 true EP0797377B1 (fr) 1999-05-26

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EP97103848A Expired - Lifetime EP0797377B1 (fr) 1996-03-22 1997-03-07 Circuit inverseur à pont amélioré pour lampes à décharge

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EP (1) EP0797377B1 (fr)
CA (1) CA2200500A1 (fr)
DE (2) DE19611417A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001015289A (ja) * 1999-04-28 2001-01-19 Mitsubishi Electric Corp 放電灯点灯装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5192896A (en) * 1992-04-10 1993-03-09 Kong Qin Variable chopped input dimmable electronic ballast

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392089A (en) * 1981-07-20 1983-07-05 Gte Products Corporation Isolator for use with frequency responsive switching circuit
DE3417194A1 (de) * 1984-05-09 1985-11-14 TRW Messmer GmbH & Co KG, 7760 Radolfzell Schaltungsanordnung zur steuerung der leistung eines gleichstromgespeisten verbrauchers, insbesondere fuer die instrumentenbeleuchtung eines kraftfahrzeuges
DK161274C (da) * 1986-10-31 1991-12-02 Jorck & Larsen Vekselstroemsgenerator til forsyning og regulering af f.eks. lysstofroer, anvendelse af vekselstroemsgenerator og fremgansgsmaade til regulering af vekselstroem
JP2567435B2 (ja) * 1987-12-23 1996-12-25 松下電工株式会社 放電灯点灯装置
JPH02132797A (ja) * 1988-11-10 1990-05-22 Wako Electric Co Ltd 放電灯点灯回路
JPH06267686A (ja) * 1993-03-11 1994-09-22 Hitachi Lighting Ltd 放電灯点灯装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5192896A (en) * 1992-04-10 1993-03-09 Kong Qin Variable chopped input dimmable electronic ballast

Also Published As

Publication number Publication date
EP0797377A1 (fr) 1997-09-24
DE19611417A1 (de) 1997-09-25
CA2200500A1 (fr) 1997-09-22
DE59700170D1 (de) 1999-07-01

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