EP0808084B1 - Mise hors circuit de sécurité en cas de regime asymétrique - Google Patents

Mise hors circuit de sécurité en cas de regime asymétrique Download PDF

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Publication number
EP0808084B1
EP0808084B1 EP97107206A EP97107206A EP0808084B1 EP 0808084 B1 EP0808084 B1 EP 0808084B1 EP 97107206 A EP97107206 A EP 97107206A EP 97107206 A EP97107206 A EP 97107206A EP 0808084 B1 EP0808084 B1 EP 0808084B1
Authority
EP
European Patent Office
Prior art keywords
circuit
voltage
lamp
coupling capacitor
threshold value
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
EP97107206A
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German (de)
English (en)
Other versions
EP0808084A2 (fr
EP0808084A3 (fr
Inventor
Felix Dr. Franck
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 EP0808084A2 publication Critical patent/EP0808084A2/fr
Publication of EP0808084A3 publication Critical patent/EP0808084A3/fr
Application granted granted Critical
Publication of EP0808084B1 publication Critical patent/EP0808084B1/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
    • H05B41/295—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 circuit for safety shutdown an AC operating circuit for discharge lamps, in particular low-pressure discharge lamps according to the preamble of Claim 1.
  • operating circuits for several lamps are also meant, that is operating circuits for at least one lamp.
  • Discharge lamps come with AC power operated, usually with a high frequency power.
  • For DC decoupling one is connected in series with the lamp Coupling capacitor used.
  • C. H. Sturm and E. Klein Ole. Klein "Operating Devices and Circuits for Electric Lamps", 6. Edition 1992, Siemens AG.
  • Circuits with safety shutdown devices that are based on the Address lamp voltage, that is to say on the discharge path of the lamp falling voltage.
  • the invention accordingly starts from one Circuit for AC operation of a discharge lamp via a Coupling capacitor connected in series with the lamp for DC isolation with a safety shutdown device as used in ballasts OSRAM QTEC are known.
  • EP-A-696 157 describes a circuit for AC operation of a discharge lamp described with a safety shutdown on a DC voltage at the coupling capacitor through a through the lamp flowing DC component responds.
  • the electronic ballast includes AC operation of a discharge lamp, a safety shutdown, the am by a direct current component flowing through the lamp Coupling capacitor is triggered.
  • the object of the invention is to improve the circuit in such a way that that the threshold switching of the safety shutdown in addition to the DC voltage at the coupling capacitor also to an excessive DC link voltage the operating circuit responds.
  • the same threshold switching the lamp voltage is also monitored, i.e. the threshold switching is also triggered by an excessive lamp voltage.
  • This can be done by connecting a fraction of the lamp voltage to one Part of the voltage divider circuit is applied by a circuit that is designed so that the lamp voltage fraction of the applied Fraction of the intermediate circuit voltage superimposed.
  • a connection point of the voltage divider circuit via a Trigger diode connected to a suitable point of the threshold circuit be so that the threshold switching on both Polarities of the DC voltage responds.
  • An embodiment of the circuit according to the invention provides before, the connection point of the trigger diode or a potential adjacent connection point via a lamp filament to connect to the voltage divider circuit and between this connection point of the trigger diode or a potential adjacent connection point and one of the poles of the DC link voltage as the base potential of the safety shutdown device or another suitable base potential to switch a resistor.
  • This resistance is so dimensioned so that when the lamp is removed from its socket or if the lamp filament breaks, the potential of the named Connection point to the potential or so far in the direction pulls to the potential of the pole so that the threshold circuit is triggered via the trigger diode.
  • the threshold circuit is a bistable multivibrator, such as a thyristor equivalent circuit with two transistors.
  • a discharge lamp is powered by a push-pull frequency generator operated with two transistors. Then can the safety shutdown device be constructed so that after their response via a shutdown transistor Control of one of the two transistors suppressed, for example the base of a bipolar transistor with low resistance to ground connects.
  • Fig. 1 there is an upper one in the double-lined frame Part RE1, RE2 of a voltage divider circuit RE1, RE2, R1 shown, the resistor RE1, a coupling capacitor C3 with a falling DC voltage UC3 in the event of a fault is connected in parallel.
  • RE1 is clear greater than the AC resistance of C3 at the operating frequency the lamp.
  • the voltage Umeß falling across the resistor R1 is when a threshold voltage UZ of a Zener diode is exceeded DZ1 a connection point of a bistable multivibrator in the form of a thyristor equivalent circuit of two Bipolar transistors supplied.
  • This toggle switch has one stable state in which both transistors are conducting, and another stable state in which both transistors do not lead.
  • the output signal line is drawn the base of an NPN turn-off transistor, not shown controlled so that it becomes conductive and the Base of a transistor, also not shown, the Lamp operating push-pull frequency generator with low resistance shorts to ground.
  • the flip-flop on the emitter side of the top Transistors supplied with voltage in a suitable manner, so that a separate power supply is unnecessary.
  • the circuit shown in Fig. 2 corresponds to that just described except for the double-framed additional Trigger diode D3 between the base of the upper transistor the flip-flop and a connection point between the resistor RE2 and the coupling capacitor C3 or here the Lamp filament.
  • the reason for the trigger diode is that the voltage divider circuit only one opposite the intermediate circuit voltage E. Charging or voltage UC3 on the coupling capacitor C3 into a trigger signal through the Zener diode DZ1 implemented because only then the measuring voltage Umeß increases becomes. With opposite charging of the coupling capacitor C3 the potential at the upper connection point drops the trigger diode D3, so that this then the potential at the Pull down the base of the upper flip-flop transistor and thus trigger the flip-flop in the conductive state can.
  • FIG. 3 shows the same circuit as FIG. 2, but additionally with a resistor R3 connected between the upper connection point of the trigger diode D3 and the lower pole of the intermediate circuit voltage E, here a "pulldown resistor".
  • R3 connected between the upper connection point of the trigger diode D3 and the lower pole of the intermediate circuit voltage E, here a "pulldown resistor”.
  • This is dimensioned such that it pulls the potential of its upper connection point in the direction of the potential of the lower pole of the intermediate circuit voltage E in the absence of a lamp, filament breakage or the like, ie it is significantly lower-impedance than RE2.
  • the flip-flop is triggered via the trigger diode D3 even if the filament breaks or the lamp is removed.
  • the last-described function of the circuit from FIG. 3 is particularly practical when a lamp, for example in a larger lighting system with many lamps, removed shall be. Then there is no need to switch off the whole lighting system, so that faster and with normal lighting can be worked.

Claims (8)

  1. Circuit de mise hors circuit de sécurité d'un circuit d'alimentation en tension alternative de lampes de décharge, le circuit comprenant
    un condensateur (C3) de couplage, qui est partie constitutive du circuit de lampe du circuit d'alimentation en tension alternative et y sert en même temps à séparer le courant continu, et
    un dispositif de mise hors circuit de sécurité, ayant un circuit à valeur de seuil qui est déclenché par une certaine tension (UC3) continue aux bornes du condensateur (C3) de couplage,
       caractérisé en ce que
    le circuit à valeur de seuil est déclenché en outre par une tension (E) surélevée de circuit intermédiaire,
    une fraction de la tension (E) de circuit intermédiaire obtenue par un circuit diviseur de tension (RE1, RE2, R1) est appliquée au circuit à valeur de seuil,
    le condensateur (C3) de couplage est monté en parallèle à une partie (RE1) du circuit diviseur de tension (RE1, RE2, R1),
    entre la partie (RE1) du circuit diviseur de tension (RE1,RE2, R1), qui est montée en parallèle au condensateur (C3) de couplage, et le reste du circuit diviseur de tension (RE2, R1), est montée une électrode de la lampe, et
    la résistance de la partie (RE1) du circuit diviseur de tension (RE1, RE2, R1), montée en parallèle au condensateur (C3) de couplage, est sensiblement plus grande que la résistance en courant alternatif du condensateur (C3) de couplage à la fréquence du circuit d'alimentation en tension alternative de la lampe.
  2. Circuit suivant le revendication 1, caractérisé en ce que le circuit à valeur de seuil est déclenché également par une tension (UL) de la lampe surélevée.
  3. Circuit suivant la revendication 2, caractérisé en ce qu'une fraction de la tension (UL) de la lampe est appliquée à une partie du circuit diviseur de tension (RE1, RE2, R1) de façon à se superposer à la fraction de la tension (E) de circuit intermédiaire qui est appliquée.
  4. Circuit suivant la revendication 1, caractérisé en ce qu'un point de raccordement du circuit diviseur de tension (RE1, RE2, R1) est relié au circuit à valeur de seuil par une diode (D3) de déclenchement de façon que le circuit à valeur de seuil soit déclenché par des tensions (UC3) continues des deux polarités sur le condensateur (C3) de couplage.
  5. Circuit suivant la revendication 4, caractérisé en ce que le point de raccordement de la diode (D3) de déclenchement ou un point de raccordement voisin du point de vue du potentiel est relié par un filament de lampe au circuit diviseur de tension et, entre le point de raccordement de la diode (D3) de déclenchement ou un point de raccordement voisin du point de vue du potentiel et l'un des pôles de la tension (E) de circuit intermédiaire ou un autre potentiel de base qui convient, est montée une résistance (R3) conçue pour, lorsque l'on enlève la lampe ou lors d'une rupture du filament de la lampe, amener le potentiel du point de raccordement vers le potentiel du pôle ou vers le potentiel de base afin de déclencher le circuit à valeur de seuil par l'intermédiaire de la diode (D3) de déclenchement.
  6. Circuit suivant la revendication 1, caractérisé en ce que le circuit à valeur de seuil est un circuit bistable à bascule.
  7. Circuit suivant la revendication 6, caractérisé en que le circuit bistable à bascule est un circuit de remplacement à thyristor ayant deux transistors.
  8. Circuit suivant l'une des revendications précédentes,
    caractérisé en ce que la lampe est alimentée par un générateur de fréquence symétrique, ayant deux transistors et le circuit de mise hors circuit de sécurité supprime, après avoir été excité par un transistor de mise hors circuit, l'excitation de l'un des deux transistors.
EP97107206A 1996-05-15 1997-04-30 Mise hors circuit de sécurité en cas de regime asymétrique Expired - Lifetime EP0808084B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19619580 1996-05-15
DE19619580A DE19619580A1 (de) 1996-05-15 1996-05-15 Sicherheitsabschaltung bei asymmetrischer Lampenleistung

Publications (3)

Publication Number Publication Date
EP0808084A2 EP0808084A2 (fr) 1997-11-19
EP0808084A3 EP0808084A3 (fr) 1998-04-22
EP0808084B1 true EP0808084B1 (fr) 2001-06-27

Family

ID=7794387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97107206A Expired - Lifetime EP0808084B1 (fr) 1996-05-15 1997-04-30 Mise hors circuit de sécurité en cas de regime asymétrique

Country Status (4)

Country Link
US (1) US5939832A (fr)
EP (1) EP0808084B1 (fr)
CA (1) CA2205323C (fr)
DE (2) DE19619580A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941437A1 (de) 1999-08-30 2001-03-01 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe
DE10046443A1 (de) * 2000-09-18 2002-03-28 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Elektronische Schaltung zur Detektion des Wandelbruchs bei Gasentladungslampen
WO2003041457A1 (fr) * 2001-11-07 2003-05-15 Koninklijke Philips Electronics N.V. Arrangement de circuit ballast assurant le fonctionnement d'une lampe a decharge, avec detection de la fin de duree de vie de cette lampe
DE10163033A1 (de) * 2001-12-20 2003-07-03 Tridonicatco Gmbh & Co Kg Elektronisches Vorschaltgerät mit Überwachungsschaltung zum Erkennen des in einer Gasentladungslampe auftretenden Gleichrichteffekts
DE102005028419A1 (de) * 2005-06-20 2006-12-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Abschaltschaltung
CN101060737A (zh) * 2006-04-19 2007-10-24 皇家飞利浦电子股份有限公司 一种探测灯的功能状态的电路和镇流器
US8482213B1 (en) 2009-06-29 2013-07-09 Panasonic Corporation Electronic ballast with pulse detection circuit for lamp end of life and output short protection
US8947020B1 (en) 2011-11-17 2015-02-03 Universal Lighting Technologies, Inc. End of life control for parallel lamp ballast
CN202455166U (zh) * 2011-12-31 2012-09-26 东莞市洁德电子科技有限公司 感应装置、感应充电器和感应应急灯

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57110084A (en) * 1980-12-26 1982-07-08 Toshiba Electric Equip Corp Transistor inverter
US5023516A (en) * 1988-05-10 1991-06-11 Matsushita Electric Industrial Co., Ltd. Discharge lamp operation apparatus
DE3925899A1 (de) * 1989-08-04 1991-02-07 Zumtobel Ag Elektronisches vorschaltgeraet fuer gasentladungslampen
DE4100349C2 (de) * 1990-01-31 1994-04-28 Siemens Ag Elektronisches Vorschaltgerät
US5387846A (en) * 1991-11-27 1995-02-07 Selwyn Yuen Combination ballast for driving a fluorescent lamp or tube and ballast protection circuit
US5475284A (en) * 1994-05-03 1995-12-12 Osram Sylvania Inc. Ballast containing circuit for measuring increase in DC voltage component
US5528147A (en) * 1994-06-30 1996-06-18 Motorola Lighting, Inc. Apparatus for detecting gas discharge lamp faults
US5574335A (en) * 1994-08-02 1996-11-12 Osram Sylvania Inc. Ballast containing protection circuit for detecting rectification of arc discharge lamp

Also Published As

Publication number Publication date
CA2205323C (fr) 2005-03-22
CA2205323A1 (fr) 1997-11-15
EP0808084A2 (fr) 1997-11-19
DE19619580A1 (de) 1997-11-20
DE59703889D1 (de) 2001-08-02
EP0808084A3 (fr) 1998-04-22
US5939832A (en) 1999-08-17

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