EP2252133A2 - Schaltungsanordnung zum betreiben einer niederdruck-gasentladungslampe und entsprechendes verfahren - Google Patents

Schaltungsanordnung zum betreiben einer niederdruck-gasentladungslampe und entsprechendes verfahren Download PDF

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Publication number
EP2252133A2
EP2252133A2 EP10160395A EP10160395A EP2252133A2 EP 2252133 A2 EP2252133 A2 EP 2252133A2 EP 10160395 A EP10160395 A EP 10160395A EP 10160395 A EP10160395 A EP 10160395A EP 2252133 A2 EP2252133 A2 EP 2252133A2
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EP
European Patent Office
Prior art keywords
coupled
control device
primary winding
discharge lamp
gas discharge
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.)
Withdrawn
Application number
EP10160395A
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German (de)
English (en)
French (fr)
Inventor
Bernd Rudolph
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
Osram GmbH
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 Osram GmbH filed Critical Osram GmbH
Publication of EP2252133A2 publication Critical patent/EP2252133A2/de
Withdrawn legal-status Critical Current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 at least one low-pressure gas discharge lamp, having an input with a first and a second input terminal for applying a DC supply voltage, having an output having a first and a second output terminal pair for connecting the at least one low-pressure gas discharge lamp.
  • an inverter coupled to the first and second input terminals for providing an AC supply voltage from the DC supply voltage, with control means for driving the inverter and thereby controlling the frequency of the AC supply voltage, the controller being configured to initiate a preheat phase upon satisfaction of a predetermined preheat criterion in which the inverter is operated with a preheating frequency, and after fulfillment of a predetermined ignition criterion, the frequency of the AC supply voltage to a Z.
  • the invention relates to a method for operating a low-pressure gas discharge lamp in such a circuit arrangement.
  • the invention is based on a circuit arrangement, as described in the document EP 0 748 146 A1 is described.
  • an inverter provides an alternating supply voltage for a low-pressure gas discharge lamp (fluorescent lamp).
  • a resonance choke is coupled to the inverter.
  • a resonant capacitor is coupled in parallel with the low pressure gas discharge lamp.
  • the inverter controls all operating functions of the gas discharge lamp. After commissioning of the circuit - this by applying a mains AC voltage to a coupled to the inverter power supply - the inverter is operated during a preheating for gentle ignition of the gas discharge lamp with such a frequency, not only above the idle resonance frequency of the resonant circuit (resonance choke and resonant capacitor), but is also above an ignition frequency.
  • a preheating current flows over the electrodes of the gas discharge lamp. This current is intended to heat the electrodes to emission temperature. Since the frequency of the alternating supply voltage during the preheating phase is greater than the ignition frequency of the gas discharge lamp, premature ignition of the Gas discharge lamp prevents. In fact, above the resonant frequency of the resonant circuit, the amplitude of the voltage across the resonant capacitor is indirectly proportional to the frequency.
  • a transformer is used in the subject of the above document, the primary winding is connected via a coupling capacitor to the output of the inverter.
  • the primary winding can be coupled to the reference potential via a semiconductor switch.
  • two secondary windings which are each coupled to an electrode of the gas discharge lamp. In this way, the electrodes can be preheated.
  • the primary winding of the transformer is connected in series with the resonant capacitor and connected directly to the reference potential of the controller, and an electrical switch is coupled in parallel with the primary winding of the transformer.
  • the electrical switch has a control terminal which is coupled to the control device.
  • the control device is designed to convert after fulfillment of the ignition criterion the electrical switch in its electrically conductive switching state.
  • the effect of the invention is achieved in that the primary winding of the transformer coupled on the one hand with the resonant capacitor in series and on the other hand connected directly to the reference potential of the control device, as well as by bridging the primary winding during ignition of the low-pressure gas discharge lamp.
  • a basic idea of the invention is to allow the current flowing via the resonance capacitor connected in parallel to the gas discharge lamp to flow during the preheating phase also via the primary winding - which is connected to the reference potential of the control device - and the primary winding after the preheating phase on the primary side with the reference potential short circuit the controller by means of the electric switch.
  • the circuit arrangement according to the invention on the one hand has the advantage that it manages without an additional coupling capacitor for the primary winding of the transformer; the function of the coupling capacitor takes over here the resonant capacitor.
  • the circuit arrangement according to the invention is also without a clamping diode, as used in the prior art; the primary winding is namely when igniting the Gas discharge lamp shorted by means of the electrical switch.
  • Another advantage of the circuit arrangement according to the invention over the object according to document EP 0 748 146 A1 can be seen in the fact that a low-cost low-voltage switch (generally less than 100 volts) can be used for bridging the primary winding. In the prior art, on the other hand, the switch had to be designed to operate at high voltages as they drop across the primary winding (typically 600 volts).
  • circuit arrangement according to the invention offers advantages in terms of the number of components used and thus in terms of cost.
  • a capacitor between the primary winding and the reference potential had to be used.
  • the switch used there, with which the primary winding and the capacitor are bridged, must withstand high voltages, which is associated with additional costs compared to a low-voltage switch.
  • the coupling capacitor can be coupled between the second terminal pair of the output and the reference potential of the control device (ie connected to the "low side" of the gas discharge lamp). In this way, the coupling capacitor can also be performed symmetrically, and the current load of a DC link capacitor coupled in parallel to the input and the voltage of the gas discharge lamp to ground can be reduced.
  • the control device can switch off the inverter and thus the AC supply voltage.
  • the electrical switch is a bidirectionally blocking or conducting semiconductor switch.
  • the electrical switch may be a symmetric blocking MOSFET.
  • MOSFETs in which the parasitic diode is no longer present, are recently available in the market. With a MOSFET on the one hand significantly shorter switching times can be achieved than with a conventional relay; On the other hand, MOSFETs are cheaper.
  • the circuit arrangement has the advantage that the voltage drop across the primary winding of the transformer can be measured, whereby operating conditions prevailing at the output can be detected.
  • the control device is coupled to a detection pole arranged between the winding and the resonance capacitor and designed to detect the voltage dropping across the primary winding. The following relationship is exploited: If the impedance of a circuit having the secondary winding changes, the effective impedance at the primary winding of the transformer also changes. The change in the impedance on the secondary side can therefore be detected directly by the evaluation of the voltage at the primary winding. If the voltage drop across the primary winding lies in an impermissible value range, then the control device can switch off the alternating supply voltage.
  • An operator turns on a power switch to turn on the gas discharge lamp. From the AC voltage of the supply network, a power supply provides a DC supply voltage for the circuit arrangement. Even before the preheating phase is initiated - in which the electrodes of the gas discharge lamp are preheated - the control device controls the inverter in such a way that very small currents flow via the primary winding. The control device now checks whether the voltage drop across the primary winding is within a permissible value range, that is, whether the gas discharge lamp is properly connected to the output and the lamp electrodes are in order or not. If the control device recognizes, for example, that no gas discharge lamp is connected to the circuit arrangement, the control device switches off the inverter.
  • the control device is designed to control the inverter before initiating the preheating phase and to detect the voltage dropping across the primary winding during this activation, wherein the preheating criterion includes that this voltage lies within a predetermined value range.
  • the preheating is initiated by the controller only if the gas discharge lamp is properly connected to the circuit. It is thus prevented that the preheating is initiated, for example, when no gas discharge lamp is connected, and that an operator with a high voltage in contact.
  • the circuit arrangement also does not require the high-voltage resistors, coupling capacitors or diodes otherwise used to detect the presence of the lamp electrodes on the secondary windings of the preheating transformer.
  • the control device can also detect the voltage dropping across the primary winding during the preheating phase. Then the ignition criterion includes that this voltage is within a predetermined value range.
  • the control device can therefore also during the preheating an inadmissible Recognize operating state at the output of the circuit arrangement and optionally interrupt the preheat phase. This can be the case, for example, if during the preheating phase the gas discharge lamp is unscrewed or a filament of the lamp burns out.
  • This embodiment may, for example, be implemented in such a manner: An operator turns on a power switch, thereby providing a DC supply voltage at the input of the circuitry.
  • the control device initiates the preheating phase, namely with appropriate control of the inverter.
  • the controller monitors the voltage drop across the primary winding. At the beginning of the preheat phase, this voltage is within the specified permissible value range, so that the preheat phase is continued.
  • a filament of the gas discharge lamp burns through, and there is an idle between the terminals of the corresponding terminal pair. This idling recognizes the control device, namely the fact that the voltage at the primary winding is outside the predetermined permissible value range.
  • the controller turns off the inverter.
  • the ignition criterion may include that after initiation of the preheat phase, a predetermined time interval has elapsed. It is then ensured that the electrodes of the gas discharge lamp are preheated for the predetermined time interval and the gas discharge lamp is gently ignited.
  • a method according to the invention is for operating at least one low-pressure gas discharge lamp on a circuit arrangement designed the genus mentioned above.
  • an electrical current flowing across the resonant capacitor is also conducted across the primary winding of the transformer, the primary winding being directly coupled to the reference potential of the controller.
  • an electrical switch is closed and the primary winding is thereby bridged.
  • a circuit arrangement 1 shown in the figure comprises an input 2 with a first and a second input terminal 3, 4.
  • a DC supply voltage U G can be provided, namely by means of a power supply from an AC voltage of a supply network.
  • an intermediate circuit capacitor 5 is connected, to which the DC supply voltage U G is applied.
  • an inverter 6 including a first electrical switch 7 and a second electrical switch 8 is connected.
  • the inverter 6 serves to provide an AC supply voltage U V , which usually has such a frequency, which is significantly greater than the frequency of the mains voltage.
  • a control device 9 For controlling the inverter 6, a control device 9 is provided, which can set the frequency of the AC supply voltage U V , namely with appropriate control of the inverter 6.
  • the controller 9 is located at a first reference potential 10, which is also connected to the second input terminal 4 and thus also represents a reference potential of the inverter 6.
  • the AC supply voltage U V is provided between a pole 11, which is arranged between the first and the second switch 7, 8, and the first reference potential 10.
  • the circuit arrangement 10 comprises a resonance circuit 12, which has a resonance choke 13 and a resonance capacitor 14.
  • the resonant choke 13 is connected on the one hand to the pole 11 - ie to the inverter 6 - and on the other hand to a resonant pole 15.
  • the resonant capacitor 14 is coupled between the resonant pole 15 and the first reference potential 10.
  • the circuit arrangement 1 comprises an output 16, which has a first and a second output connection pair 17, 18.
  • the first output terminal pair 17 comprises a first and a second terminal 17a, 17b, wherein the second output terminal pair 18 also has two terminals 18a, 18b.
  • a low-pressure gas discharge lamp 19 is connected, which is operated with the circuit arrangement 1.
  • the first terminal 18a of the second output terminal pair 18 is connected on the one hand via a first coupling capacitor 20 to the first reference potential 10, that is, by means of the first coupling capacitor 20 of the first reference potential 10 is electrically decoupled.
  • the first terminal 18a of the second output terminal pair 18 is connected to the first input terminal 3 via a second coupling capacitor 21.
  • the first terminal 18a of the second output terminal pair 18 represents a second reference potential 22 (ie, so-called "low side" of the gas discharge lamp 19).
  • the two coupling capacitors 20, 21 ensure that over the gas discharge lamp 19 no direct currents can flow. Such direct currents could lead to an apparent inhomogeneity of the light emitted by the gas discharge lamp 19 (cataphoresis).
  • the symmetrical Arrangement of the coupling capacitors 20, 21 achieves the advantage that the current load of the intermediate circuit capacitor 5 is the lowest.
  • the circuit arrangement 1 comprises a transformer 23 having a primary winding 24, a first secondary winding 25 and a second secondary winding 26.
  • the primary winding 24 is connected in series with the resonance capacitor 14 and, on the other hand, directly connected to the first reference potential 10.
  • the first secondary winding 25 is connected on the one hand to the first terminal 17a and on the other hand to the second terminal 17b of the first output terminal pair 17.
  • the second secondary winding 26 is connected on the one hand to the first terminal 18a and on the other hand to the second terminal 18b of the second output terminal pair 18.
  • an electrical switch 27 is connected, whose control terminal is coupled to the control device 9.
  • this switch 27 is switchable by the control device 9 between an electrically conductive switching state, in which the primary winding 24 is bridged, and a blocking switching state.
  • the electrical switch 27 may, for example, be a MOSFET, in particular such a MOSFET, which does not have a parasitic diode and is therefore designed symmetrically.
  • the control device 9 is arranged with a between the resonance capacitor 14 and the primary winding 24 Pol 28 coupled, namely via a high-impedance resistor 29.
  • the resistance of the ohmic resistance 29 may be, for example, 1 M ⁇ . Due to the connection to the pole 28, the control device 9 can detect a voltage drop across the primary winding 24. The control device 9 can evaluate this voltage and, by means of this evaluation, refer back to the operating states prevailing at the output 16. If the impedance at the output 19 changes, be it at the first and / or the second output terminal pair 17 or 18, the voltage drop across the primary winding 24 also changes.
  • the control device 9 can thus recognize that, for example, a filament of the lamp 19 has burnt out or whether there is a short circuit between the terminals 17a, 17b or 18a, 18b. If the voltage across the primary winding 24 lies in an impermissible value range during a preheating phase of the electrodes of the lamp 19, then the control device 9 can switch off the inverter 6 and thus the supply alternating voltage U V.
  • the DC supply voltage U G is provided, for example by closing a power switch by an operator. If the DC supply voltage U G at the input 2, so is the control device 9 in operation; it can generate the AC supply voltage U V for the gas discharge lamp 19 by driving the inverter 6.
  • the control device 9 controls the inverter 6 in such a way that via the primary winding 24 very small currents flow. This can be achieved in that the control device 9 adjusts such a frequency of the alternating supply voltage U V , which is significantly higher than a preheating frequency and an ignition frequency.
  • the control device 9 checks whether the voltage drop across the primary winding 24 is within a predetermined value range or not. If this can be confirmed, it means that the gas discharge lamp 19 is properly connected to the output 16. If the voltage at the primary winding 24 is in an impermissible value range, the control device 9 switches off the inverter 6, and there is no voltage at the output 16.
  • the control device 9 initiates the preheating phase.
  • the electrodes of the gas discharge lamp 19 are heated, namely to a temperature which ensures a gentle start of the gas discharge lamp 19.
  • the preheating criterion includes that, on the one hand, the DC operating voltage U G is provided at the input 2 and, on the other hand, that the voltage across the primary winding 28 - during the control of the inverter 6 (small currents across the primary winding 25) - is within the predetermined value range.
  • the control device 9 checks whether the voltage across the primary winding 25 is within a predetermined value range. After the fulfillment of a predetermined ignition criterion, the control device 9 ends the preheating phase and lowers the frequency of the alternating supply voltage U V so that the gas discharge lamp 19 ignites. When the lamps 19 are ignited, that is to say when the ignition criterion has been met, the control device 9 closes the electrical switch 27 so that it bridges the primary winding 24.
  • the ignition criterion includes that the voltage detected at the primary winding 24 during the preheating phase is within the predetermined value range and a predetermined time interval has elapsed after the preheating phase has been initiated, that is, the preheating phase has continued for a predetermined time. In this way it is achieved that the electrodes of the gas discharge lamp 19 are heated to the desired temperature and the lamp 19 can be gently ignited.
  • a circuit arrangement 1 which can be produced more cost-effectively compared to the prior art.
  • the circuit arrangement 1 does not require costly components, such as without a high-voltage switch, without a diode and without an additional coupling capacitor for the primary winding 24, as described in the subject matter of the publication EP 0 748 146 A1 be used.
  • the resonance capacitor 14 also performs the function of a coupling capacitor for the primary winding 24.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP10160395A 2009-05-12 2010-04-20 Schaltungsanordnung zum betreiben einer niederdruck-gasentladungslampe und entsprechendes verfahren Withdrawn EP2252133A2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009020849A DE102009020849A1 (de) 2009-05-12 2009-05-12 Schaltungsanordnung zum Betreiben einer Niederdruck-Gasentladungslampe und entsprechendes Verfahren

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Publication Number Publication Date
EP2252133A2 true EP2252133A2 (de) 2010-11-17

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EP10160395A Withdrawn EP2252133A2 (de) 2009-05-12 2010-04-20 Schaltungsanordnung zum betreiben einer niederdruck-gasentladungslampe und entsprechendes verfahren

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Country Link
US (1) US8228000B2 (ja)
EP (1) EP2252133A2 (ja)
JP (1) JP2010267617A (ja)
KR (1) KR20100122463A (ja)
CN (1) CN101888735B (ja)
DE (1) DE102009020849A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013152371A2 (de) * 2012-04-13 2013-10-17 Tridonic Gmbh & Co Kg Verfahren zum betreiben eines llc-resonanzwandlers für ein leuchtmittel, wandler und led-konverter
WO2014172735A1 (de) * 2013-04-26 2014-10-30 Tridonic Gmbh & Co Kg Konstantström-konverter für beleuchtungseinrichtungen
WO2014176611A1 (de) * 2013-04-30 2014-11-06 Tridonic Gmbh & Co Kg Verfahren zum betreiben eines led-konverters

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2567149B1 (de) * 2010-05-07 2015-07-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Leuchtmittel zum ersatz einer leuchtstoffröhre
WO2013152370A1 (de) * 2012-04-13 2013-10-17 Tridonic Gmbh & Co Kg Wandler für ein leuchtmittel, led-konverter und verfahren zum betrei- ben eines llc-resonanzwandlers
DE102012007477B4 (de) * 2012-04-13 2024-02-22 Tridonic Gmbh & Co Kg Verfahren zum Betreiben eines LLC-Resonanzwandlers für ein Leuchtmittel, Wandler und LED-Konverter
CN109814016A (zh) * 2019-03-28 2019-05-28 寿县楚光照明器具有限公司 一种气体放电灯管的检测装置及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748146A1 (de) 1995-06-08 1996-12-11 Siemens Aktiengesellschaft Schaltungsanordnung zur Wendelvorheizung von Leuchtstofflampen
US20060267519A1 (en) 2005-05-31 2006-11-30 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Apparatus for safely connecting the lamp to the equipment voltage ground

Family Cites Families (5)

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FI107009B (fi) * 1999-03-31 2001-05-15 Teknoware Oy Loistelampun liitäntälaite
ATE245337T1 (de) * 1999-05-25 2003-08-15 Tridonicatco Gmbh & Co Kg Elektronisches vorschaltgerät für mindestens eine niederdruck-entladungslampe
DE10036950A1 (de) * 2000-07-28 2002-02-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Betriebsgerät für Entladungslampen mit Schalterentlastung beim Vorheizen der Elektrodenwendeln
DE10333729A1 (de) * 2003-07-23 2005-03-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Vorschaltgerät für mindestens eine Hochdruckentladungslampe, Betriebsverfahren und Beleuchtungssytem für eine Hochdruckentladungslampe
DE102005013564A1 (de) * 2005-03-23 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Betreiben mindestens einer Lampe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748146A1 (de) 1995-06-08 1996-12-11 Siemens Aktiengesellschaft Schaltungsanordnung zur Wendelvorheizung von Leuchtstofflampen
US20060267519A1 (en) 2005-05-31 2006-11-30 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Apparatus for safely connecting the lamp to the equipment voltage ground

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013152371A2 (de) * 2012-04-13 2013-10-17 Tridonic Gmbh & Co Kg Verfahren zum betreiben eines llc-resonanzwandlers für ein leuchtmittel, wandler und led-konverter
WO2013152371A3 (de) * 2012-04-13 2014-05-08 Tridonic Gmbh & Co Kg Verfahren zum betreiben eines llc-resonanzwandlers für ein leuchtmittel, wandler und led-konverter
WO2014172735A1 (de) * 2013-04-26 2014-10-30 Tridonic Gmbh & Co Kg Konstantström-konverter für beleuchtungseinrichtungen
WO2014176611A1 (de) * 2013-04-30 2014-11-06 Tridonic Gmbh & Co Kg Verfahren zum betreiben eines led-konverters

Also Published As

Publication number Publication date
CN101888735A (zh) 2010-11-17
US8228000B2 (en) 2012-07-24
US20100289419A1 (en) 2010-11-18
JP2010267617A (ja) 2010-11-25
KR20100122463A (ko) 2010-11-22
CN101888735B (zh) 2014-06-11
DE102009020849A1 (de) 2010-11-18

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