EP1025746B1 - Schaltungsanordnung zum betrieb von mindestens zwei entladungslampen - Google Patents

Schaltungsanordnung zum betrieb von mindestens zwei entladungslampen Download PDF

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Publication number
EP1025746B1
EP1025746B1 EP99924760A EP99924760A EP1025746B1 EP 1025746 B1 EP1025746 B1 EP 1025746B1 EP 99924760 A EP99924760 A EP 99924760A EP 99924760 A EP99924760 A EP 99924760A EP 1025746 B1 EP1025746 B1 EP 1025746B1
Authority
EP
European Patent Office
Prior art keywords
coupling capacitor
transistor
bridge inverter
circuit
emitter
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
EP99924760A
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German (de)
English (en)
French (fr)
Other versions
EP1025746A1 (de
Inventor
Jürgen Klier
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 EP1025746A1 publication Critical patent/EP1025746A1/de
Application granted granted Critical
Publication of EP1025746B1 publication Critical patent/EP1025746B1/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
    • 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 invention relates to a circuit arrangement for operating at least two Discharge lamps according to claim 1.
  • the circuit arrangement disclosed in the published patent application EP 0 753 987 A1 has a half-bridge inverter with a shutdown device that the half-bridge inverter in the event of an abnormal operating state - for example in the event of an unwanted or defective lamp - switches off.
  • the shutdown device has a field effect transistor, whose drain-source path in the control circuit a half-bridge inverter transistor is arranged and the control circuit switches between a low-resistance and a high-resistance state. If an abnormal operating state occurs, the shutdown takes place synchronously to the blocking phase of the half-bridge inverter transistor in its control circuit the field effect transistor is arranged.
  • the shutdown device of this Circuit arrangement switches the half-bridge inverter when the ignition is unwanted Lamp reliably off, but it is generally too insensitive to the Occurrence of the so-called rectification effect of the discharge lamp, which follows is explained in more detail.
  • the rectification effect of the discharge lamp in discharge lamps causes that are operated on a half-bridge inverter, a significant deviation the voltage drop across the coupling capacitor or at the coupling capacitors from the normal value, which is usually half the value the input voltage of the half-bridge inverter.
  • With self-oscillating Half-bridge inverters cause this deviation in the voltage drop across the Coupling capacitor or the coupling capacitors so that the vibration of the Half-bridge inverter is stopped because the supply voltage is one of the two half-bridge branches in this case too low to maintain the Feedback is.
  • the vibration of the half-bridge inverter immediately after their interruption by starting the half-bridge inverter restarted when the shutdown device is not is triggered.
  • the discharge lamp affected by the rectification effect not switched off reliably, but instead flickers.
  • the published patent application EP 0 886 460 A1 describes a half-bridge inverter for operating a discharge lamp with a circuit for detecting the occurrence of the rectification effect in the discharge lamp. This circuit monitors the Voltage drop across the coupling capacitor.
  • the laid-open specification WO 97/43879 discloses a ballast for operation a discharge lamp with means for detecting the rectifier effect in the Discharge lamp.
  • the published patent application EP 0 681 414 A2 describes a ballast for operation of discharge lamps with an inverter and a circuit that the occurrence a DC component monitored over the lamp electrodes and the oscillation of the inverter may stop.
  • the object of the invention to provide an improved circuit arrangement for operation of at least two discharge lamps to provide the disadvantages of the prior art which does not have technology.
  • the circuit arrangement is intended to occur the rectification effect in the at least two discharge lamps and in this case switch off the half-bridge inverter permanently or at least a limitation of the voltage and / or the current in the load circuit to harmless Ensure values.
  • the rectification effect occurs in the discharge lamps a significant deviation in the voltage drop at the Coupling capacitors from their normal value, which is half the size of the input voltage of the half-bridge inverter.
  • the occurrence of the rectification effect in the discharge lamps is detected by using their help deviations in the voltage drop across the coupling capacitors from their setpoint are determined, one coupling capacitor to the other Coupling capacitor serves as a reference voltage source, and a corresponding one Output signal generated and the control device of the half-bridge inverter is supplied to either switch off the half-bridge inverter or for example by increasing the frequency, the voltage and / or the current to regulate down to non-hazardous values in the load circuit.
  • the output signal of the detector circuit is supplied to the half-bridge inverter when an abnormal operating condition occurs, that is, when a fault occurs.
  • the detector circuit advantageously consists of at least two transistors and a voltage divider.
  • the transistors are advantageously around pnp bipolar transistors.
  • the voltage divider of the detector circuit advantageously has a first and a second connection and a first and a second center tap, the first connection with the at least one Coupling capacitor and the second terminal connected to the reference voltage source is, and wherein the first center tap with the emitter of the first pnp transistor and the base of the second pnp transistor is connected while the second center tap on the emitter of the second pnp transistor and on the base of the first pnp transistor is connected.
  • the collector connections of the pnp transistors are advantageously connected to the voltage output of the detector circuit connected.
  • the first embodiment ( Figure 1) describes the application of the invention to a circuit arrangement for operating two fluorescent lamps connected in parallel LP3, LP4.
  • This circuit arrangement has two as a half-bridge inverter interconnected npn transistors Q30, Q31, their control electrodes with the control device A3 of the half-bridge inverter are connected.
  • the half-bridge inverter Q30, Q31 receives its input or Supply voltage via the DC voltage connections j30, j33.
  • the DC voltage connection j33 is at ground potential and at the DC voltage connection A voltage of approximately +400 V is provided for j30.
  • This input or supply voltage is in a known manner, for example with the help an upstream step-up converter, not shown in the figures, from the rectified mains AC voltage generated.
  • the control device A3 of the half-bridge inverter Q30, Q31 is as Integrated circuit executed the switching clock of the transistors Q30, Q31 certainly.
  • two parallel load circuits designed as series resonance circuits are connected. Both load circuits each have a resonance inductance L3 or L4, a resonance capacitor C30 or C31 and a fluorescent lamp LP3 or LP4 on.
  • a coupling capacitor C32 or C33 is connected to both load circuits.
  • half is connected to both coupling capacitors C32, C33 Supply voltage U / 2 of the half-bridge inverter Q30, Q31.
  • the potentials at the taps M31, M32 are therefore ideally U / 2, that is approximately +200 V.
  • a voltage input is off the voltage dividing resistors R30, R31, R32 and the PNP transistors Q32, Q33 existing detector circuit connected.
  • the voltage output of this detector circuit is from the interconnected collectors of the pnp transistors Q32, Q33 formed. It is with the control circuit A3 of the half-bridge inverter Q30, Q31 connected.
  • the first center tap j31 of the voltage divider R30, R31, R32 is connected to the emitter of the first PNP transistor Q32 and connected to the base of the second pnp transistor Q33 while its second center tap j32 with the emitter of the second pnp transistor Q33 and the base of the first pnp transistor Q32 is connected.
  • the detector circuit of the first embodiment monitors the voltage drop across both coupling capacitors C32 and C33, in that a coupling capacitor C32 or C33 connects the other coupling capacitor C33 or C32 serves as a reference voltage source.
  • the first pnp transistor Q32 turned on.
  • the Voltage drop at the second coupling capacitor C33 from the ideal value U / 2 200 V deviate.
  • the voltage drop across the second coupling capacitor increases C33 to more than 300 V, the second pnp transistor Q33 connected through.
  • the detector circuit In all of the aforementioned cases, in which one of the two pnp transistors Q32 or Q33 is turned on, the detector circuit generates at its voltage output a control signal for the control device A3 of the half-bridge inverter Q30, Q31, which is preferably used to switch off the half-bridge inverter Q30, Q31 is used.
  • the control device A3 of the half-bridge inverter Q30, Q31 which is preferably used to switch off the half-bridge inverter Q30, Q31 is used.
  • the detector circuit of the first exemplary embodiment is not.
  • a suitable one Dimensioning of the components used in the first embodiment is in Table 1 given.
  • FIG. 2 shows a detector circuit with three voltage inputs E1, E2, E3 for a circuit arrangement with a half-bridge inverter, at the center tap three load circuits connected in parallel are connected.
  • Each of the voltage inputs E1, E2, E3 is with the connection of the Coupling capacitor connected to one of the load circuits.
  • This detector circuit compares the voltage drop across the coupling capacitors of the three load circuits. It works completely analogously to the detector circuit of the first embodiment.
  • the detector circuit shown in FIG. 2 consists of three pnp transistors Q42, Q43, Q44, three base-emitter resistors R41, R43, R45 and three series resistors R40, R42, R44.
  • the interconnected collectors of the PNP transistors Q42, Q43, Q44 form the voltage output of the detector circuit.
  • the transistor Q44 or Q42 or Q43 turns on. Will the potential at input E1 or E2 or E3 compared to the potential at the other two Inputs lowered above the response threshold, the transistor switches Q42 or Q43 or Q44.
  • This detector circuit can be by adding further pnp transistors and base-emitter resistors as well as others Adapt series resistors to more than three load circuits connected in parallel.
  • the invention is not limited to the exemplary embodiments explained in more detail above.
  • the pnp transistors of the detector circuits can also be replaced by field effect transistors with a similar current-voltage characteristic.
  • npn transistors can also be used for the detector circuit. It then only has to be ensured with suitable means that the control device of the half-bridge inverter is acted upon by the detector circuit with control signals of the correct polarity.
  • Dimensioning of the electrical components according to the first embodiment L3, L4 1.6 mH C30, C31 7.5 nF C32, C33 68 nF R30, R32 390 k ⁇ R31 4.7 k ⁇ Q32, Q33 BF421

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)
EP99924760A 1998-08-20 1999-04-01 Schaltungsanordnung zum betrieb von mindestens zwei entladungslampen Expired - Lifetime EP1025746B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19837728A DE19837728A1 (de) 1998-08-20 1998-08-20 Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe
DE19837728 1998-08-20
PCT/DE1999/001010 WO2000011916A1 (de) 1998-08-20 1999-04-01 Schaltungsanordnung zum betrieb mindestens einer entladungslampe

Publications (2)

Publication Number Publication Date
EP1025746A1 EP1025746A1 (de) 2000-08-09
EP1025746B1 true EP1025746B1 (de) 2002-09-04

Family

ID=7878098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99924760A Expired - Lifetime EP1025746B1 (de) 1998-08-20 1999-04-01 Schaltungsanordnung zum betrieb von mindestens zwei entladungslampen

Country Status (7)

Country Link
US (1) US6288500B1 (ja)
EP (1) EP1025746B1 (ja)
JP (1) JP4315598B2 (ja)
AT (1) ATE223638T1 (ja)
CA (1) CA2306815A1 (ja)
DE (2) DE19837728A1 (ja)
WO (1) WO2000011916A1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI106426B (fi) * 1999-03-31 2001-01-31 Innoware Oy Loistelamppujen liitäntälaite
DE69927990T2 (de) * 1999-12-24 2006-08-03 Stmicroelectronics S.R.L., Agrate Brianza Spannungsumrichter mit einer selbstschwingenden Halbbrücke nstruktur
CN1784108A (zh) 2000-06-19 2006-06-07 国际整流器有限公司 内部和外部元件最少的镇流控制集成电路
DE10108138A1 (de) * 2001-02-20 2002-08-29 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schutzschaltung für eine Leuchstofflampe
CN1582605A (zh) * 2001-11-07 2005-02-16 皇家飞利浦电子股份有限公司 具有灯使用期限检测的放电灯镇流器电路安排
US7902764B2 (en) * 2005-05-04 2011-03-08 Stmicroelectronics S.R.L. Control device for discharge lamp
DE202005013675U1 (de) * 2005-08-30 2005-12-15 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH EVG für Entladungslampen mit EoL Überwachungsschaltung
DE502007006528D1 (de) 2007-03-29 2011-03-31 Osram Gmbh Schaltungsanordnung zur ansteuerung mindestens einer leuchtstofflampe
DE102009004851A1 (de) * 2009-01-16 2010-07-29 Osram Gesellschaft mit beschränkter Haftung Detektorschaltung und Verfahren zur Ansteuerung einer Leuchtstofflampe
DE102009004852A1 (de) 2009-01-16 2010-07-29 Osram Gesellschaft mit beschränkter Haftung Detektorschaltung und Verfahren zur Ansteuerung einer Leuchtstofflampe
DE102009007159A1 (de) * 2009-02-03 2010-10-07 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung zum Betreiben eines Konverters
DE102012207002A1 (de) * 2011-12-23 2013-06-27 Tridonic Gmbh & Co. Kg Verfahren, Betriebsgerät und Beleuchtungssystem

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW307980B (ja) * 1994-04-28 1997-06-11 Toshiba Light Technic Kk
US5475284A (en) * 1994-05-03 1995-12-12 Osram Sylvania Inc. Ballast containing circuit for measuring increase in DC voltage component
US5783911A (en) 1995-07-12 1998-07-21 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating electric lamps, and operating method for electric lamps
NZ326348A (en) * 1996-01-26 1999-03-29 Tridonic Bauelemente Method and control circuit for regulation of the operational characteristics especially brightness of gas discharge lamps where lamp current is used as a regulating variable
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
US5703439A (en) * 1996-05-10 1997-12-30 General Electric Company Lamp power supply circuit with electronic feedback circuit for switch control
FI102347B (fi) 1997-06-18 1998-11-13 Helvar Oy Lampun tasasuuntauksen tunnistuspiirillä varustettu elektroninen liitä ntälaite

Also Published As

Publication number Publication date
CA2306815A1 (en) 2000-03-02
DE59902543D1 (de) 2002-10-10
US6288500B1 (en) 2001-09-11
WO2000011916A1 (de) 2000-03-02
ATE223638T1 (de) 2002-09-15
DE19837728A1 (de) 2000-02-24
EP1025746A1 (de) 2000-08-09
JP4315598B2 (ja) 2009-08-19
JP2002523888A (ja) 2002-07-30

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