EP0693864B1 - Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen - Google Patents

Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen Download PDF

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Publication number
EP0693864B1
EP0693864B1 EP95110851A EP95110851A EP0693864B1 EP 0693864 B1 EP0693864 B1 EP 0693864B1 EP 95110851 A EP95110851 A EP 95110851A EP 95110851 A EP95110851 A EP 95110851A EP 0693864 B1 EP0693864 B1 EP 0693864B1
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EP
European Patent Office
Prior art keywords
circuit arrangement
circuit
voltage
lamp
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.)
Expired - Lifetime
Application number
EP95110851A
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German (de)
English (en)
French (fr)
Other versions
EP0693864A2 (de
EP0693864A3 (de
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.)
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 EP0693864A2 publication Critical patent/EP0693864A2/de
Publication of EP0693864A3 publication Critical patent/EP0693864A3/de
Application granted granted Critical
Publication of EP0693864B1 publication Critical patent/EP0693864B1/de
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, for example, in the PCT application with the international publication number WO 93/12631 discloses.
  • This circuit arrangement has one Inverters with a downstream resonant circuit for operating one or more Low-pressure discharge lamps with preheated lamp electrodes.
  • the preheating phase the lamp electrodes are terminated by a relay or a semiconductor switch, that receives its control signal from a threshold or time switch in turn, during the preheating phase, the voltage drop across the electrode filaments evaluates the lamp.
  • the electrode coils already relatively small tolerances comparatively large scatter of their ohmic Resistance, so that even with electrodes of the same type that are connected to the Heating voltages applied to the electrode filaments are subjected to correspondingly large variations is.
  • the circuit arrangement according to the first embodiment has a a half-bridge inverter connected to a DC voltage source, consisting of two switching transistors Q1, Q2 and a control unit A for these switching transistors.
  • a series resonance circuit at the center tap V1 of the half-bridge inverter connected to a resonance inductor L, a resonance capacitor C2 and two low-pressure discharge lamps LP1 connected in series with one another, LP2 with an electrical power consumption of 58 W each.
  • the sequence start capacitor C1 is parallel to the lamp LP1 and the resonance capacitor C2 arranged parallel to the series connection of both lamps LP1, LP2.
  • the circuit also has two Heating circuits for preheating the lamp electrodes E1, E2, E3, E4.
  • the first heating circuit is operated by the electrode coils E1, E4, the bridge rectifier GL, the primary winding of the transformer TR, the ohmic resistance Z and the drain-source path of the field effect transistor Q3. It serves for Heating the lamp electrodes E1 and E4.
  • the ohmic resistance Z and the drain-source path are in series and between the DC voltage connections of the Bridge rectifier GL switched so that they are in the low-resistance state of the heating circuit or the field effect transistor Q3 flows through the electrode heating current become.
  • Parallel to the series connection of resistor Z and drain-source path of the Field effect transistor Q3 is connected to a voltage divider R1, R2, whose center tap M with the gate electrode of the field effect transistor Q3 and with the collector a bipolar transistor Q4 is connected.
  • the collector-emitter path of the transistor Q4 is connected in parallel to the resistor R2 of the voltage divider. Parallel to Voltage divider R1, R2 is also arranged an RC element R3, C5, via its time constant the duration of the preheating phase can be set. Hangs in particular the duration of the preheating phase does not depend on the temperature-dependent course of the electrode coil resistance from.
  • the base-emitter path of transistor Q4 is together with a basic series resistor R4 and a Zener diode D1, parallel to Capacitor C5 of the RC element switched. One between the resistors Z and R1 arranged rectifier diode D2 prevents the discharge current of the capacitor C5 flows over the switching path of the field effect transistor Q3.
  • the second heating element is coupled to the first and consists of the electrode coils E2, E3, the resistor R5 and the secondary winding of the transformer arranged in parallel with the resistor R5 TR.
  • the inverter After commissioning the circuit arrangement, the inverter generates Q1, Q2, A a high-frequency (approx. 50 KHz) alternating voltage between taps V1, V2.
  • the field effect transistor Q3 is switched on via the voltage divider R1, R2, whereby the resistor Z ensures that in the low-resistance state of the field effect transistor Q3 a sufficiently high DC voltage of approx. 10 V at the voltage divider R1, R2 is available to control the gate electrode via resistor R2, so that a high-frequency heating current through the lamp electrodes E1, E4 can flow.
  • a heating current is generated in the second heating circuit via the transformer TR induced for the lamp electrodes E2, E3.
  • the battery charges during the preheating phase Capacitor C5 through resistor R3.
  • the Zener diode D1 becomes conductive and switches through the bipolar transistor Q4, so that the now conductive collector-emitter path of transistor Q4 bridges resistor R2. This will make the gate electrode the field effect transistor Q3 withdrawn the control signal, so that its drain-source path and thus the first heating circuit also becomes high-resistance. About the transformative Coupling also blocks the second heating circuit.
  • the electrode preheating phase has ended and the resonance capacitor C2 builds up for the low-pressure discharge lamps LP1, LP2 required ignition voltage.
  • the capacitor C5 charges after the ignition of the lamps LP1, LP2 about the operating voltage of the lamps to a DC voltage, which via the resistor R4 and the Zener diode D1 to safe switching of the transistor Q4 and thus to block the field effect transistor Q3 is sufficient in lamp operation.
  • FIG. 2 shows a second embodiment of the circuit arrangement according to the invention.
  • the circuit arrangement has one fed by a direct current source Half-bridge inverter, consisting of the two switching transistors Q1 ', Q2' and the control device A '.
  • a direct current source Half-bridge inverter consisting of the two switching transistors Q1 ', Q2' and the control device A '.
  • the lamp choke L ' At the center tap V1 'of the inverter a series resonance circuit is connected, the lamp choke L ', a coupling capacitor C3 'and a resonance capacitor C2' contains.
  • the resonance capacitor C2 ' is connected to the negative pole of the DC voltage source.
  • Parallel to Resonance capacitor C2 ' is a low-pressure discharge lamp LP' with preheatable Electrodes coiled E1 ', E2' switched.
  • Both lamp electrodes are also in one Integrated electrode heating circuit, which as a further essential components Capacitor Z ', a bridge rectifier GL' and a field effect transistor Q3 ' having.
  • Capacitor Z ' a bridge rectifier GL' and a field effect transistor Q3 ' having.
  • the drain-source path of the field effect transistor Q3 ' is between the DC voltage connections of the bridge rectifier GL 'integrated during the Capacitor Z 'in series with the AC connections of the bridge rectifier GL 'is arranged so that the capacitor Z' in series with the drain-source path of the field effect transistor Q3 'is connected.
  • the control of the field effect transistor Q3 ' takes place via a rectifier diode connected to a tap V3' in the heating circuit D2 'and a voltage divider R1', R2 ', whose center tap M' to the gate electrode of the field effect transistor Q3 'is connected.
  • Parallel to the voltage divider R1 ', R2' is also, as already described in the first embodiment RC element, consisting of the ohmic resistor R3 'and the capacitor C5', connected.
  • the circuit arrangement has a further switching transistor Q4 ', whose base connection via a Zener diode D1' and a series resistor R4 ', the are both arranged in parallel to the capacitor C5 'is controlled.
  • the emitter of the transistor Q4 ' is connected to the negative pole of the capacitor C5' and to the Bridge rectifier GL 'connected while the collector of transistor Q4' over the center tap M 'of the voltage divider R1', R2 'to the gate electrode of the field effect transistor Q3 'is connected.
  • a lamp voltage monitoring element consisting from the one connected in parallel to the drain-source path of the field effect transistor Q3 ' Voltage divider R6, R7 and the one arranged parallel to the resistor R7 Series connection of rectifier diode D3 and capacitor C6.
  • the inverter After commissioning the circuit arrangement, the inverter generates Q1 ', Q2', A 'in the series resonant circuit a high-frequency (approx. 50 KHz) AC voltage.
  • the Field effect transistor Q3 ' is via the rectifier diode D2' and the voltage divider R1 ', R2' switched on, the capacitor Z 'ensuring that the low-resistance State of the field effect transistor Q3 'a sufficiently high voltage (for example 10 V) is available at the voltage divider R1 ', R2', via the resistor R2 ' to drive the gate electrode, so that a high-frequency heating current through the Lamp electrodes E1 ', E2' flows.
  • a sufficiently high voltage for example 10 V
  • this control voltage is here by means of in the AC circuit of the Bridge rectifier GL 'integrated capacitor Z' generated.
  • the capacitor C5 ' is preheated via the rectifier diode D2' and the ohmic resistor R3 'charged.
  • the electrode preheating phase has ended and the resonance capacitor C2 'builds up for the low-pressure discharge lamp LP 'required ignition voltage.
  • the capacitor C5 'recharges the ignition of the lamp LP 'via the operating voltage of the lamp to a DC voltage on, via the resistor R4 'and the Zener diode D1' for safe Turning on the transistor Q4 'and thus to block the field effect transistor Q3 'is sufficient in lamp operation. So far is the principle of operation of this circuit largely identical to that of the first embodiment.
  • the additional at second embodiment installed lamp voltage monitoring element R6, R7, D3, C6 monitors the ignition and operating voltage on the low-pressure discharge lamp LP '.
  • the voltage drop across capacitor C6 is from a shutdown device evaluated, here for the sake of clarity with the control device A 'is summarized.
  • Low pressure discharge lamps age in the course their operating time, d. that is, they exhibit an increase in ignition voltage and often also asymmetrical burned electrodes. The latter can lead to DC operation of the low pressure discharge lamp.
  • An increase in the ignition or operating voltage on the lamp LP ' is the voltage drop across the capacitor C6 of the shutdown device communicated.
  • the shutdown device usually deprives one of the Switching transistors Q1 or Q2 of the half-bridge inverter have the base signal 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 shown.
  • the circuit arrangement has one from a direct current source fed half-bridge inverter, consisting of the two switching transistors Q1 ", Q2" and the control device A ".
  • To the center tap V1" of the Inverter is connected to a series resonance circuit, which is a lamp choke L ", a coupling capacitor C3" and a resonance capacitor C2 "contains.
  • the resonance capacitor C2 is connected to the negative pole of the DC voltage source.
  • a low-pressure discharge lamp is parallel to the resonance capacitor C2 " LP "with preheatable electrode filaments E1", E2 "switched.
  • Both lamp electrodes E1 “, E2” are also integrated in an electrode heating circuit, which acts as another essential components a capacitor Z "and a field effect transistor Q3" having.
  • the capacitor Z " is in series with the drain-source path of the field effect transistor Q3 "is switched on.
  • the field effect transistor Q3" is activated via a rectifier diode D2 connected to a tap V3 "in the heating circuit and one Voltage divider R1 ", R2", the center tap M “to the gate electrode of the Field effect transistor Q3 "is connected.
  • an RC element from the ohmic resistor R3 "and the capacitor C5" In parallel to the voltage divider R1", R2 " furthermore, as already described in the first exemplary embodiment, an RC element from the ohmic resistor R3 "and the capacitor C5".
  • the circuit arrangement has a further switching transistor Q4 ", the Base connection via a Zener diode D1 "and a series resistor R4", both are arranged in parallel to the capacitor C5 "is driven.
  • the emitter of the Transistor Q4 " is with the negative pole of the capacitor C5" and with the lamp electrode E1 "connected while the collector of transistor Q4" through the center tap M “of the voltage divider R1", R2 "to the gate electrode of the field effect transistor Q3 "is connected.
  • the operation of the third embodiment differs slightly from that of the previously explained exemplary embodiments.
  • the third embodiment is the field effect transistor Q3, as in the first two embodiments described, integrated in the DC circuit of a bridge rectifier GL, GL ', but directly into the one with high-frequency alternating current Heating circuit switched.
  • the electrode preheater works here also without rectifier GL or GL '.
  • the inverter After commissioning the circuit arrangement, the inverter generates Q1 ", Q2", A "in the series resonance circuit a high frequency (approx. 50 KHz) AC voltage Field effect transistor Q3 "is via the rectifier diode D2" and the voltage divider R1 “, R2” turned on, the capacitor Z "ensures that in the low-resistance State of the field effect transistor Q3 "a sufficiently high voltage (for example 10 V) on the voltage divider R1 ", R2" is available to switch over the Resistor R2 "to drive the gate electrode, so that a high-frequency heating current flows through the lamp electrodes E1 ", E2". Unlike the previous ones In both exemplary embodiments, the field effect transistor Q3 sees an alternating current here.
  • a sufficiently high voltage for example 10 V
  • the positive half-wave of the heating current over the drain-source path of the field effect transistor Q3 passesed during the negative half-wave of the heating current via the parallel to the drain-source path, in the Field effect transistor Q3 "integrated free-wheeling diode (shown in broken lines in FIG. 3) flows.
  • the capacitor C5 is also on the Rectifier diode D2 "and the ohmic resistor R3" charged.
  • the electrode preheating phase has now ended and is being built on the resonance capacitor C2 " the ignition voltage required for the low-pressure discharge lamp LP ".
  • the capacitor C5 discharges after the lamp LP has been ignited” via the operating voltage the lamp to a DC voltage which is connected via the resistor R4 "and the Zener diode D1 "for safely switching on the transistor Q4" and thus for Blocking the field effect transistor Q3 "in lamp operation is sufficient.
  • the preheating phase is created with the help of the freewheeling diode on the drain-source path of the field effect transistor Q3 "a reverse voltage, which is approximately the ignition or operating voltage corresponds to the lamp LP ". Therefore, when selecting the field effect transistor Q3 "to ensure that this has sufficient dielectric strength has.
  • the voltage loading of the field effect transistor Q3 can also with the help of an additional capacitor connected in parallel to the drain-source path C "(shown in dashed lines in Figure 3), so that it with the capacitor Z" one capacitive voltage divider forms can be reduced.
  • 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.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP95110851A 1994-07-21 1995-07-11 Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen Expired - Lifetime EP0693864B1 (de)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6523794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95110851A Expired - Lifetime EP0693864B1 (de) 1994-07-21 1995-07-11 Schaltungsanordnung zum Betrieb einer oder mehrerer Niederdruckentladungslampen

Country Status (5)

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

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US7592753B2 (en) * 1999-06-21 2009-09-22 Access Business Group International Llc Inductively-powered gas discharge lamp circuit
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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
DE10140723A1 (de) * 2001-08-27 2003-03-20 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Betriebsschaltung für Entladungslampe mit vorheizbaren Elektroden
US7176636B2 (en) * 2001-11-23 2007-02-13 Koninklijke Philips Electronics N.V. Circuit arrangement for operating a lamp
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
DE10252836A1 (de) * 2002-11-13 2004-05-27 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Vorrichtung zum Betreiben von Entlaudungslampen
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
US8212489B2 (en) 2007-01-17 2012-07-03 Osram Ag Circuit arrangement and method for starting and operating one or more discharge lamps
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
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Also Published As

Publication number Publication date
DE4425859A1 (de) 1996-01-25
EP0693864A2 (de) 1996-01-24
JPH0855690A (ja) 1996-02-27
DE59510237D1 (de) 2002-07-18
EP0693864A3 (de) 1997-12-03
CA2153108A1 (en) 1996-01-22
US5589740A (en) 1996-12-31
CA2153108C (en) 2003-06-17

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