EP0693864A2 - Circuit pour alimenter une ou plusieurs lampes à décharge basse-pression - Google Patents

Circuit pour alimenter une ou plusieurs lampes à décharge basse-pression Download PDF

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Publication number
EP0693864A2
EP0693864A2 EP95110851A EP95110851A EP0693864A2 EP 0693864 A2 EP0693864 A2 EP 0693864A2 EP 95110851 A EP95110851 A EP 95110851A EP 95110851 A EP95110851 A EP 95110851A EP 0693864 A2 EP0693864 A2 EP 0693864A2
Authority
EP
European Patent Office
Prior art keywords
circuit
circuit arrangement
heating
voltage
arrangement according
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
EP95110851A
Other languages
German (de)
English (en)
Other versions
EP0693864B1 (fr
EP0693864A3 (fr
Inventor
Bernd Rudolph
Alwin Veser
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.)
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Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP0693864A2 publication Critical patent/EP0693864A2/fr
Publication of EP0693864A3 publication Critical patent/EP0693864A3/fr
Application granted granted Critical
Publication of EP0693864B1 publication Critical patent/EP0693864B1/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

Definitions

  • the invention relates to a circuit arrangement for operating one or more low-pressure discharge lamps according to the preamble of patent claim 1.
  • Such a circuit arrangement corresponding to the preamble of claim 1, is disclosed, for example, in the PCT application with the international publication number WO 93/12631.
  • This circuit arrangement has an inverter with a downstream resonant circuit for operating one or more low-pressure discharge lamps with preheated lamp electrodes.
  • the preheating phase of the lamp electrodes is ended by a relay or a semiconductor switch which receives its control signal from a threshold or time switch which, in turn, evaluates the voltage drop across the electrode filaments of the lamp during the preheating phase.
  • a relay or a semiconductor switch which receives its control signal from a threshold or time switch which, in turn, evaluates the voltage drop across the electrode filaments of the lamp during the preheating phase.
  • the first heating circuit is formed by the electrode coils E1, E4, the bridge rectifier GL, the primary winding of the transformer TR, the ohmic resistor Z and the drain-source path of the field effect transistor Q3. It is used to heat the lamp electrodes E1 and E4.
  • the ohmic resistor Z and the drain-source path are connected in series and between the DC voltage connections of the bridge rectifier GL, so that the electrode heating current flows through them in the low-resistance state of the heating circuit or the field effect transistor Q3.
  • a voltage divider R1, R2, whose center tap M is connected to the gate electrode of the field effect transistor Q3 and to the collector of a bipolar transistor Q4, is connected in parallel with the series circuit comprising the resistor Z and the drain-source path of the field effect transistor Q3.
  • the collector-emitter path of transistor Q4 is connected in parallel to resistor R2 of the voltage divider.
  • An RC element R3, C5 is also arranged in parallel with the voltage divider R1, R2, and the duration of the preheating phase can be set via its time constant. In particular, the duration of the preheating phase does not depend on the temperature-dependent profile of the electrode coil resistance.
  • the base-emitter path of the transistor Q4, together with a base series resistor R4 and a zener diode D1, is parallel to the Capacitor C5 of the RC element switched.
  • a rectifier diode D2 arranged between the resistors Z and R1 prevents the discharge current of the capacitor C5 from flowing over the switching path of the field effect transistor Q3.
  • the second heating circuit is coupled to the first by means of a transformer and consists of the electrode coils E2, E3, the resistor R5 connected in series and the secondary winding of the transformer TR arranged parallel to the resistor R5.
  • the inverter Q1, Q2, A After commissioning the circuit arrangement, the inverter Q1, Q2, A generates a high-frequency (approx. 50 KHz) alternating voltage between the taps V1, V2.
  • the field effect transistor Q3 is switched on via the voltage divider R1, R2, the resistor Z ensuring that, in the low-resistance state of the field effect transistor Q3, a sufficiently high DC voltage of approximately 10 V is available at the voltage divider R1, R2 in order to use the resistor R2 to gate the gate -Electrode to be controlled so that a high-frequency heating current can flow through the lamp electrodes E1, E4.
  • a heating current for the lamp electrodes E2, E3 is induced in the second heating circuit via the transformer TR.
  • capacitor C5 charges via resistor R3.
  • the zener diode D1 becomes conductive and switches the bipolar transistor Q4 through, so that the now conductive collector-emitter path of the transistor Q4 bridges the resistor R2. This removes the control signal from the gate electrode of field effect transistor Q3, so that its drain-source path and thus also the first heating circuit becomes high-resistance.
  • the second heating circuit is also blocked via the transformer coupling.
  • the electrode preheating phase has ended and the ignition voltage required for the low-pressure discharge lamps LP1, LP2 builds up at the resonance capacitor C2.
  • the capacitor C5 charges up to a direct voltage via the operating voltage of the lamps, which is sufficient via the resistor R4 and the Zener diode D1 to reliably switch on the transistor Q4 and thus to block the field effect transistor Q3 in lamp operation.
  • FIG. 2 shows a second embodiment of the circuit arrangement according to the invention. Similar reference numerals as in FIG. 1 were chosen for functionally identical components.
  • the circuit arrangement has a half-bridge inverter fed by a direct current source, consisting of the two switching transistors Q1 ', Q2' and the control device A '.
  • a series resonance circuit is connected to the center tap V1 'of the inverter and contains a lamp inductor L', a coupling capacitor C3 'and a resonance capacitor C2'.
  • the resonance capacitor C2 ' is connected to the negative pole of the DC voltage source.
  • a low-pressure discharge lamp LP 'with preheatable electrode filaments E1', E2 ' is connected in parallel with the resonance capacitor C2'.
  • Both lamp electrodes are also integrated in an electrode heating circuit which, as further essential components, has a capacitor Z ', a bridge rectifier GL' and a field effect transistor Q3 '.
  • the drain-source path of the field effect transistor Q3 ' is integrated between the DC voltage connections of the bridge rectifier GL', while the capacitor Z 'is arranged in series with the AC voltage connections of the bridge rectifier GL', so that the capacitor Z 'is connected in series with the drain-source Route of the field effect transistor Q3 'is switched.
  • the field effect transistor Q3 ' is controlled via a rectifier diode D2' connected to a tap V3 'in the heating circuit and a voltage divider R1', R2 ', the center tap M' of which is connected to the gate electrode of the field effect transistor Q3 '.
  • an RC element consisting of the ohmic resistor R3 'and the capacitor C5' is also connected, as already described in the first exemplary embodiment.
  • the circuit arrangement has a further switching transistor Q4 ', the base connection of which is controlled via a zener diode D1' and a series resistor R4 ', both of which are arranged in parallel with the capacitor C5'.
  • the emitter of the transistor Q4 ' is connected to the negative pole of the capacitor C5' and to the bridge rectifier GL ', while the collector of the transistor Q4' via the center tap M 'of the voltage divider R1', R2 'to the gate electrode of the field effect transistor Q3' connected.
  • the circuit arrangement according to the second exemplary embodiment has a lamp voltage monitoring element, consisting of the one connected in parallel to the drain-source path of the field effect transistor Q3 ' Voltage divider R6, R7 and the series connection of rectifier diode D3 and capacitor C6 arranged parallel to resistor R7.
  • the inverter Q1 ', Q2', A ' generates a high-frequency (approx. 50 KHz) AC voltage in the series resonance circuit.
  • the field effect transistor Q3 ' is switched on via the rectifier diode D2' and the voltage divider R1 ', R2', the capacitor Z 'ensuring that in the low-resistance state of the field effect transistor Q3' a sufficiently high voltage (for example 10 V) at the voltage divider R1 ', R2 'is available to control the gate electrode via the resistor R2', so that a high-frequency heating current flows through the lamp electrodes E1 ', E2'.
  • a sufficiently high voltage for example 10 V
  • this control voltage is generated here by means of the capacitor Z 'integrated in the alternating current circuit of the bridge rectifier GL'.
  • the capacitor C5 ' is charged via the rectifier diode D2' and the ohmic resistor R3 '. If the voltage across the capacitor C5 'exceeds a critical value, the zener diode D1' becomes conductive and switches the bipolar transistor Q4 'through, so that the now conductive collector-emitter path of the transistor Q4' bridges the resistor R2 '.
  • the electrode preheating phase has ended and the ignition voltage required for the low-pressure discharge lamp LP 'builds up at the resonance capacitor C2'.
  • the capacitor C5' charges itself to a DC voltage via the operating voltage of the lamp, which, via the resistor R4 'and the Zener diode D1', ensures that the transistor Q4 'is switched on and thus blocks the field-effect transistor Q3' in Lamp operation is sufficient.
  • the functional principle of this circuit is largely identical to that of the first exemplary embodiment.
  • the lamp voltage monitoring element R6, R7, D3, C6 additionally installed in the second exemplary embodiment monitors the ignition and operating voltage at the low-pressure discharge lamp LP '.
  • the voltage drop across the capacitor C6 is evaluated by a shutdown device, which is summarized here for the sake of clarity with the control device A '.
  • Low-pressure discharge lamps age over the course of their operating time, ie they have an increase in the ignition voltage and often also asymmetrically burned-off electrodes. The latter can lead to DC operation of the low pressure discharge lamp.
  • An increase in the ignition or operating voltage at the lamp LP ' is reported to the shutdown device via the voltage drop across the capacitor C6.
  • the disconnection device switches off the inverter Q1 ', Q2'.
  • the disconnection device usually extracts the base signal from one of the switching transistors Q1 or Q2 of the half-bridge inverter and thus shuts down the inverter.
  • a description of such a shutdown device can be found, for example, in utility model DE-U 91 14 204.
  • FIG. 3 shows a third exemplary embodiment of the circuit arrangement according to the invention.
  • the circuit arrangement has a half-bridge inverter fed by a direct current source, consisting of the two switching transistors Q1 ′′, Q2 ′′ and the control device A ′′.
  • a series resonance circuit is connected to the center tap V1 ′′ of the inverter and contains a lamp inductor L ′′, a coupling capacitor C3 ′′ and a resonance capacitor C2 ′′.
  • the resonance capacitor C2 ′′ is connected to the negative pole of the DC voltage source.
  • a low-pressure discharge lamp LP '' with preheatable electrode filaments E1 '', E2 '' is connected in parallel with the resonance capacitor C2 ''.
  • Both lamp electrodes E1 ′′, E2 ′′ are also integrated in an electrode heating circuit which has a capacitor Z ′′ and a field effect transistor Q3 ′′ as further essential components.
  • the capacitor Z ′′ is connected in series with the drain-source path of the field effect transistor Q3 ′′.
  • the field effect transistor Q3 '' is controlled via a rectifier diode D2 '' connected to a tap V3 '' in the heating circuit and a voltage divider R1 '', R2 '', the center tap M '' of which is connected to the gate electrode of the field effect transistor Q3 '' connected.
  • an RC element consisting of the ohmic resistor R3 ′′ and the capacitor C5 ′′, is also connected, as already described in the first exemplary embodiment.
  • the circuit arrangement has a further switching transistor Q4 ′′, the base connection of which is driven via a zener diode D1 ′′ and a series resistor R4 ′′, both of which are arranged in parallel with the capacitor C5 ′′.
  • the emitter of the transistor Q4 is connected to the negative pole of the capacitor C5" and to the lamp electrode E1 ", while the collector of the transistor Q4" is connected to the center tap M "of the voltage divider R1", R2 " Gate electrode of the field effect transistor Q3 '' is connected.
  • the mode of operation of the third exemplary embodiment differs slightly from that of the previously explained exemplary embodiments.
  • the field effect transistor Q3 is not integrated into the direct current circuit of a bridge rectifier GL, GL ', as described in the first two exemplary embodiments, but is directly connected to the heating circuit to which high-frequency alternating current is applied.
  • the electrode preheater also works here without a rectifier GL or GL '.
  • the inverter Q1 '', Q2 '', A '' After commissioning the circuit arrangement, the inverter Q1 '', Q2 '', A '' generates a high-frequency (approx. 50 KHz) AC voltage in the series resonance circuit.
  • the field effect transistor Q3 '' is switched on via the rectifier diode D2 '' and the voltage divider R1 '', R2 '', the capacitor Z '' ensuring that a sufficiently high voltage (for example 10 V) in the low-resistance state of the field effect transistor Q3 '' at the voltage divider R1 ′′, R2 ′′ is available to control the gate electrode via the resistor R2 ′′, so that a high-frequency heating current flows through the lamp electrodes E1 ′′, E2 ′′.
  • a sufficiently high voltage for example 10 V
  • the field effect transistor Q3 sees an alternating current here.
  • the positive half-wave of the heating current is conducted over the drain-source path of the field effect transistor Q3 ′′, while the negative half-wave of the heating current is conducted over the parallel to the drain-source path switched, in the field effect transistor Q3 '' integrated free-wheeling diode (shown in dashed lines in Figure 3) flows.
  • the capacitor C5 ′′ is also charged via the rectifier diode D2 ′′ and the ohmic resistor R3 ′′.
  • the zener diode D1 ′′ becomes conductive and switches the bipolar transistor Q4 ′′ through, so that the now conductive collector-emitter path of the transistor Q4 ′′ bridges the resistor R2 ′′ .
  • the electrode preheating phase has now ended and the ignition voltage required for the low-pressure discharge lamp LP '' builds up at the resonance capacitor C2 ′′.
  • the capacitor C5 '' charges itself to a DC voltage via the operating voltage of the lamp, via the resistor R4 '' and the Zener diode D1 '' for safely switching through the transistor Q4 '' and thus for blocking the field effect transistor Q3 '' is sufficient in lamp operation.
  • the freewheeling diode is used to create the drain-source path of the field effect transistor Q3 '' has a blocking voltage which corresponds approximately to the ignition or operating voltage of the lamp LP ''. Therefore, when selecting the field effect transistor Q3 ′′, care must be taken to ensure that it has sufficient dielectric strength.
  • the voltage load of the field effect transistor Q3 ′′ can also be reduced with the aid of an additional capacitor C ′′ (shown in broken lines in FIG. 3) connected in parallel with the drain-source path, so that it forms a capacitive voltage divider with the capacitor Z ′′ become.
  • the RC element R3, C5 can also take on the function of the lamp voltage monitoring unit R6, R7, C6, D3 in addition to its function described above, with suitable dimensions.
  • the switch-off device monitors the voltage drop across capacitor C5.
  • Table 1 Dimensioning of the electrical components for two 58 W fluorescent lamps connected in series according to the first exemplary embodiment Q1, Q2 BUF644 Q3 BUZ80 Q4 BC547B L 1.25 mH C1 100 pF C2 7.5 nF C3 200 nF C5 2.2 ⁇ F Z. 6.8 ⁇ R1 240 K ⁇ R2 1 M ⁇ R3 480 K ⁇ R4 10 K ⁇ R5 2.2 K ⁇

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP95110851A 1994-07-21 1995-07-11 Circuit pour alimenter une ou plusieurs lampes à décharge basse-pression Expired - Lifetime EP0693864B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4425859 1994-07-21
DE4425859A DE4425859A1 (de) 1994-07-21 1994-07-21 Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen

Publications (3)

Publication Number Publication Date
EP0693864A2 true EP0693864A2 (fr) 1996-01-24
EP0693864A3 EP0693864A3 (fr) 1997-12-03
EP0693864B1 EP0693864B1 (fr) 2002-06-12

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ID=6523794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95110851A Expired - Lifetime EP0693864B1 (fr) 1994-07-21 1995-07-11 Circuit pour alimenter une ou plusieurs lampes à décharge basse-pression

Country Status (5)

Country Link
US (1) US5589740A (fr)
EP (1) EP0693864B1 (fr)
JP (1) JPH0855690A (fr)
CA (1) CA2153108C (fr)
DE (2) DE4425859A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825136A (en) * 1996-03-27 1998-10-20 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating electric lamps, and an operating method for electronic lamps
US6744219B2 (en) * 2001-08-27 2004-06-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Operating circuit for a discharge lamp with preheatable electrodes
EP1424880A3 (fr) * 2002-11-13 2008-03-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Appareil pour alimenter des lampes à décharge

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GB2326543B (en) * 1997-06-19 1999-12-08 Toshiba Lighting & Technology Lighting apparatus
US5973455A (en) * 1998-05-15 1999-10-26 Energy Savings, Inc. Electronic ballast with filament cut-out
US7592753B2 (en) * 1999-06-21 2009-09-22 Access Business Group International Llc Inductively-powered gas discharge lamp circuit
AU6335400A (en) 1999-07-02 2001-01-22 Fusion Lighting, Inc. High output lamp with high brightness
US6674249B1 (en) * 2000-10-25 2004-01-06 Advanced Lighting Technologies, Inc. Resistively ballasted gaseous discharge lamp circuit and method
DE10100037A1 (de) * 2001-01-03 2002-07-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb von elektrischen Lampen
DE10108138A1 (de) * 2001-02-20 2002-08-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schutzschaltung für eine Leuchstofflampe
DE60209384T2 (de) * 2001-11-23 2006-10-12 Koninklijke Philips Electronics N.V. Schaltungsanordnung zum betrieb einer lampe
DE10300249B4 (de) * 2002-02-18 2010-09-09 Tridonicatco Gmbh & Co. Kg Elektronisches Vorschaltgerät für mehrere Gasentladungslampen
DE10235217A1 (de) * 2002-08-01 2004-02-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsvorrichtung und Verfahren zum Betreiben einer Lampe
ES2299986T3 (es) * 2005-03-09 2008-06-01 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Disposicion de proteccion frente a sobrecarga para convertidores electronicos, por ejemplo para lamparas halogenas.
US7821208B2 (en) * 2007-01-08 2010-10-26 Access Business Group International Llc Inductively-powered gas discharge lamp circuit
EP2103192B1 (fr) 2007-01-17 2013-03-13 OSRAM GmbH Montage électrique et procédé pour allumer et faire fonctionner une ou plusieurs lampes à décharge
US8232727B1 (en) 2009-03-05 2012-07-31 Universal Lighting Technologies, Inc. Ballast circuit for a gas-discharge lamp having a filament drive circuit with monostable control
DE102009022072A1 (de) 2009-05-20 2010-11-25 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben einer Reihenschaltung von mindestens zwei Niederdruck-Gasentladungslampen und entsprechendes Verfahren
DE202010013926U1 (de) * 2010-10-06 2012-01-11 Bag Engineering Gmbh Elektronisches Vorschaltgerät und Beleuchtungsgerät

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EP0276460A1 (fr) 1987-01-08 1988-08-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Disposition de circuit pour mettre en oeuvre une lampe à décharge basse pression
WO1993012631A1 (fr) 1991-12-09 1993-06-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour actionner une ou plusieurs lampe(s) a decharge a basse pression

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DE2924069C2 (de) * 1979-06-15 1982-05-13 Philips Patentverwaltung Gmbh, 2000 Hamburg Schaltungsanordnung zum Zünden und Betrieb einer Gas- und/oder Dampfentladungslampe
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EP0276460A1 (fr) 1987-01-08 1988-08-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Disposition de circuit pour mettre en oeuvre une lampe à décharge basse pression
WO1993012631A1 (fr) 1991-12-09 1993-06-24 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour actionner une ou plusieurs lampe(s) a decharge a basse pression

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5825136A (en) * 1996-03-27 1998-10-20 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating electric lamps, and an operating method for electronic lamps
US6744219B2 (en) * 2001-08-27 2004-06-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Operating circuit for a discharge lamp with preheatable electrodes
EP1424880A3 (fr) * 2002-11-13 2008-03-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Appareil pour alimenter des lampes à décharge

Also Published As

Publication number Publication date
DE59510237D1 (de) 2002-07-18
JPH0855690A (ja) 1996-02-27
EP0693864B1 (fr) 2002-06-12
CA2153108C (fr) 2003-06-17
CA2153108A1 (fr) 1996-01-22
DE4425859A1 (de) 1996-01-25
US5589740A (en) 1996-12-31
EP0693864A3 (fr) 1997-12-03

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