EP0808084A2 - 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
EP0808084A2
EP0808084A2 EP97107206A EP97107206A EP0808084A2 EP 0808084 A2 EP0808084 A2 EP 0808084A2 EP 97107206 A EP97107206 A EP 97107206A EP 97107206 A EP97107206 A EP 97107206A EP 0808084 A2 EP0808084 A2 EP 0808084A2
Authority
EP
European Patent Office
Prior art keywords
circuit
voltage
lamp
connection point
coupling capacitor
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.)
Granted
Application number
EP97107206A
Other languages
German (de)
English (en)
Other versions
EP0808084A3 (fr
EP0808084B1 (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 an operating circuit for discharge lamps, in particular low-pressure discharge lamps.
  • this also means operating circuits for a plurality of lamps, that is to say operating circuits for at least one lamp.
  • Discharge lamps are operated with AC power, usually with high frequency power.
  • a coupling capacitor connected in series with the lamp is used for DC decoupling.
  • Circuits with safety shutdown devices which respond to the lamp voltage, that is to say the voltage drop across the discharge path of the lamp, are known.
  • the invention accordingly proceeds from a circuit for AC operation of a discharge lamp via a coupling capacitor connected in series with the lamp for DC separation with a safety shutdown device, as is known in OSRAM QTEC ballasts.
  • the invention is based on the technical problem of further improving the safety and operating properties of the lamp with its operating circuit.
  • the problem is solved by a circuit of the type mentioned, which is characterized in that the safety shutdown device responds to a DC voltage at the coupling capacitor by means of a DC component flowing through the lamp.
  • the invention thus benefits both the safety and economy, and the electromagnetic compatibility of the lamp with its operating circuit.
  • a certain DC voltage at the coupling capacitor turns the safety shutdown device into a threshold value circuit triggered.
  • the same threshold circuit preferably also responds to an excessive intermediate circuit voltage of the operating circuit.
  • this is realized in that a fraction of the intermediate circuit voltage obtained via a voltage divider circuit is applied to the aforementioned threshold value circuit, the coupling capacitor being connected in parallel to a part of the voltage divider circuit.
  • the DC voltage at the coupling capacitor can thus influence the voltages at the voltage divider circuit and thus, like the intermediate circuit voltage, also trigger the threshold value circuit.
  • the lamp voltage is also monitored via the same threshold circuit, i.e. the threshold circuit is also triggered by an excessive lamp voltage.
  • the threshold circuit is also triggered by an excessive lamp voltage. This can be done by applying a fraction of the lamp voltage to a portion of the voltage divider circuit through a circuit designed so that the lamp voltage fraction is superimposed on the applied fraction of the intermediate circuit voltage.
  • a connection point of the voltage divider circuit can be connected via a trigger diode to a suitable point of the threshold circuit, and in such a way that the threshold circuit to both polarities of the DC voltage appeals.
  • An embodiment of the circuit according to the invention provides before connecting the connection point of the trigger diode or a potential adjacent connection point via a lamp filament to the voltage divider circuit and switching a resistor between this connection point of the trigger diode or a potential adjacent connection point and one of the poles of the intermediate circuit voltage as the base potential of the safety shutdown device or another suitable base potential.
  • This resistance is dimensioned such that when the lamp is removed from its socket or when the lamp filament breaks, it pulls the potential of the named connection point to the potential or as far towards the potential of the pole, so that the threshold value 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 often operated via a push-pull frequency generator with two transistors.
  • the safety shutdown device can be constructed in such a way that after it responds via a shutdown transistor, it suppresses the activation of one of the two transistors, for example connects the base of a bipolar transistor to ground with low resistance.
  • RE1 shows an upper part RE1, RE2 of a voltage divider circuit RE1, RE2, R1 in the double-lined frame, the resistor RE1 being connected in parallel with a coupling capacitor C3 with a DC voltage UC3 dropping there in the event of a fault.
  • the value of RE1 is significantly larger than the AC resistance of C3 at the operating frequency of the lamp.
  • RE1 and RE2 there is also a filament of a low-pressure discharge lamp in the voltage divider circuit.
  • the lamp filament is placed in the potential center of the voltage divider circuit, because the other lamp filament is generally also in the potential center of the intermediate circuit voltage in terms of DC voltage.
  • the voltage Umeß falling across the resistor R1 is supplied to a connection point of a bistable multivibrator in the form of a thyristor equivalent circuit comprising two bipolar transistors when a threshold voltage UZ of a Zener diode DZ1 is exceeded.
  • This flip-flop has a stable state in which both transistors are conducting and a further stable state in which both transistors are not conducting.
  • the base of an npn switch-off transistor is driven via the drawn-in output signal line in such a way that it becomes conductive and the base of a transistor, also not shown, of a push-pull frequency generator operating the lamp is short-circuited to ground with low resistance.
  • the flip-flop on the emitter side of the upper transistor is supplied with voltage in a suitable manner, so that a separate voltage supply is unnecessary.
  • the energy for the base current of the switch-off transistor is formed there by a start capacitor for starting the frequency generator.
  • the collector-emitter path of the switch-off transistor lies directly between the base of one of the transistors of the frequency generator and ground.
  • the DC link voltage E of a large smoothing capacitor is applied to the voltage divider circuit C3, RE1, RE2, R1 described - as indicated on the left in FIG. 1 - in front of the push-pull frequency generator.
  • the lamp voltage UL shown on the left is applied to a further voltage divider circuit (not described in any more detail), which is reduced evenly in both half-waves and is added to the capacitor C1 by the diodes D1 and D2 and the capacitor C2. Asymmetry of the lamp voltage cannot be detected here.
  • This voltage is coupled into the measuring resistor R1 in a manner known to the person skilled in the art, it being superimposed on the fraction of the intermediate circuit voltage E resulting from the voltage divider circuit C3, RE1, RE2, R1. To put it clearly, in R1 there is an addition of the currents resulting from the voltages E and UL with a corresponding superposition of the voltages dropping at R1.
  • circuit shown in FIG. 1 can monitor three different operating variables of the operating circuit with a single threshold circuit and can thus comprehensively detect fault states and convert them into switching off the lamp operation.
  • the circuit shown in Fig. 2 corresponds to the just described except for the double-framed additional trigger diode D3 between the base of the upper transistor of the trigger circuit and a connection point between the resistor RE2 and the coupling capacitor C3 or here the lamp filament.
  • the trigger diode is based on the fact that the voltage divider circuit converts only a charge or voltage UC3 at the coupling capacitor C3 opposite the intermediate circuit voltage E into a trigger signal by the Zener diode DZ1, because only then the measuring voltage Umeß is increased. If the coupling capacitor C3 is charged in the opposite direction, the potential at the upper connection point of the trigger diode D3 drops, so that this can then pull down the potential at the base of the upper trigger circuit transistor and thus trigger the trigger circuit into the conductive state.
  • 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”.
  • 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”.
  • 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, is to be removed. Then there is no need to switch off the entire lighting system, so that work can be carried out faster and with normal lighting.
  • the applicant hereby claims protection for the invention which is independent of the rest of the disclosure, in the case of a safety shutdown device by means of a resistance between a connection point which is influenced by the lamp filament and a suitable base potential, the potential of the connection point at not to move existing power line through the coil so that the safety shutdown device responds.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
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
DE19619580A DE19619580A1 (de) 1996-05-15 1996-05-15 Sicherheitsabschaltung bei asymmetrischer Lampenleistung
DE19619580 1996-05-15

Publications (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1189487A3 (fr) * 2000-09-18 2005-01-05 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit électronique pour détecter l'usure des filaments de lampes à décharge
EP1765042A3 (fr) * 2005-06-20 2008-02-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit d'arret pour l'onduleur d'un ballast électronique

Families Citing this family (7)

* 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
JP2005509264A (ja) * 2001-11-07 2005-04-07 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ ランプ寿命終了検出手段付き放電ランプ点灯用安定器回路
DE10163033A1 (de) * 2001-12-20 2003-07-03 Tridonicatco Gmbh & Co Kg Elektronisches Vorschaltgerät mit Überwachungsschaltung zum Erkennen des in einer Gasentladungslampe auftretenden Gleichrichteffekts
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1189487A3 (fr) * 2000-09-18 2005-01-05 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit électronique pour détecter l'usure des filaments de lampes à décharge
EP1765042A3 (fr) * 2005-06-20 2008-02-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit d'arret pour l'onduleur d'un ballast électronique

Also Published As

Publication number Publication date
US5939832A (en) 1999-08-17
DE19619580A1 (de) 1997-11-20
DE59703889D1 (de) 2001-08-02
EP0808084A3 (fr) 1998-04-22
CA2205323C (fr) 2005-03-22
EP0808084B1 (fr) 2001-06-27
CA2205323A1 (fr) 1997-11-15

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