EP1519638A1 - Verfahren zum Betreiben mindestens einer Niederdruckentladungslampe - Google Patents
Verfahren zum Betreiben mindestens einer Niederdruckentladungslampe Download PDFInfo
- Publication number
- EP1519638A1 EP1519638A1 EP04019957A EP04019957A EP1519638A1 EP 1519638 A1 EP1519638 A1 EP 1519638A1 EP 04019957 A EP04019957 A EP 04019957A EP 04019957 A EP04019957 A EP 04019957A EP 1519638 A1 EP1519638 A1 EP 1519638A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- voltage drop
- switching means
- low
- pressure 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.)
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Classifications
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- 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 method for operating at least one low-pressure discharge lamp according to the preamble of claim 1.
- the published patent application WO 00/72640 A1 describes a circuit arrangement and a method for operating a low-pressure discharge lamp by means of a half-bridge inverter , wherein the lamp electrodes of the at least low-pressure discharge lamp during a heating phase before igniting the gas discharge in the at least one low-pressure discharge lamp by means of a transformer whose primary-side current is clocked by means of a controllable switching means, with a Heating current to be applied and the change in electrical resistance at least one lamp electrode is monitored to it to the operating device to detect the connected type of low-pressure discharge lamp.
- the change of the electrical resistance of the lamp electrode is by means of an ohmic Resistive monitors arranged on the secondary side of the transformer is.
- the inventive method for operating at least one low-pressure discharge lamp by means of an inverter wherein the lamp electrodes of at least Low-pressure discharge lamp during a heating phase before igniting the Gas discharge in the at least one low-pressure discharge lamp by means of a Transformers whose primary-side current by means of a controllable switching means is clocked, be acted upon by a heating current and the change of the electrical Resistance of at least one lamp electrode is monitored draws
- the controllable switching means synchronous to a first inverter switching means is switched and the change of the electric Resistance of the at least one lamp electrode by means of a resistance element, which is arranged on the primary side of the transformer determined is achieved by the voltage drop across the resistor element at least two different times during the heating phase is evaluated.
- the inventive method is used to detect the lamp type during the preheat phase of the lamp electrodes, the current through the primary winding of the transformer and not the heating current on the secondary side of the Transformers evaluated. This allows for measurement arrangements in the secondary circuits of the transformer are dispensed with and the monitoring device be simplified accordingly.
- the inventive method can be and the circuit arrangement according to the invention advantageous for the operation of several low-pressure discharge lamps, since the multi-lamp operation requires no additional measuring devices.
- the growth of the electrical Resistance of the lamp electrodes with increasing heating is independent from the number of low-pressure discharge lamps operated in the load circuit, according to the invention solely by means of a resistance element on the primary side of the Transformers detected by the voltage drop across the resistive element evaluated at least two different times during the heating phase becomes.
- the voltage drop across the resistor element at a first evaluated in a time window in the range of 10 ms to 50 ms after the beginning of the heating phase is arranged to the cold resistance of the Reliable evaluation of lamp electrodes.
- the voltage drop across the resistive element at a second time evaluated which is arranged at the end of the heating phase to the heat resistance to be able to reliably evaluate the lamp electrodes. From the comparison These two readings can be used to determine if the lamp electrodes are at the beginning the heating phase were cold or whether a replacement resistor was connected instead of the lamp was. The lamp type can already be determined from the second measured value alone become.
- the preferred embodiment of the invention is a Lamp type detection performed only when the absolute amount of the difference the two aforementioned measured values exceeds a predetermined size.
- a spare resistor is connected to the operating device or the Lamp electrodes at the beginning of the heating phase since the last lamp operation were not sufficiently cooled.
- the evaluation of the voltage drop across the resistor element is in an advantageous Way performed by means of a low-pass filter.
- the low pass filter averages the voltage drop across the resistive element over a time interval long in Comparison to the switching cycle of the controllable switching means and of the inverter, but short compared to the duration of the heating phase of the lamp electrodes.
- the duration the heating phase before igniting the gas discharge in the lamp is preferably constant and is about 600 ms, while a switching clock of the controllable switching means claimed in the heating phase about 10 ⁇ s.
- the energy stored in the primary winding of the transformer becomes more advantageous Way during the off period of the controllable switching means using a second inverter switching means dissipated to a voltage overload prevent the controllable switching means.
- the stored in the primary winding Energy is preferably fed back into the DC link capacitor, which as DC power source for the inverter is used to power it for lamp operation to be able to use.
- the circuit arrangement shown in FIG. 1 is an electronic one Ballast for operating a low-pressure discharge lamp, in particular a fluorescent lamp.
- This circuit arrangement has two field effect transistors T1. T2 on, after Type of half-bridge inverter are arranged. Both field effect transistors get their control signal from a microcontroller MC.
- T2 Parallel to the DC voltage input of the half-bridge inverter T1, T2 is an intermediate circuit capacitor C1 arranged with a comparatively large capacity.
- the DC link capacitor C1 serves as a DC voltage source for the half-bridge inverter.
- a DC voltage of about 400th Volt provided from the mains AC voltage by means of a mains voltage rectifier (not shown) and a boost converter (not shown) generated becomes.
- the DC link capacitor C1 is parallel to the voltage output of the Hochsetzstellers arranged.
- Parallel to the ignition capacitor C2 are the discharge path of the fluorescent lamp LP and the coupling capacitor C3 is switched, which during steady-state operation of the lamp State of the half-bridge inverter to half the supply voltage of the half-bridge inverter is charged.
- the lamp electrodes E1, E2 of the fluorescent lamp LP are as electrode coils with two electrical Trained connections. Parallel to the electrode coil E1, E2 is respectively a secondary winding S1, S2 of a transformer connected to the inductive Heating the electrode coils E1, E2 is used.
- the primary winding P1 of this transformer is in series with the switching path of another field effect transistor T3, its control electrode also from the microcontroller MC with control signals is applied, and a measuring resistor R1 connected.
- the series connection from the components P1, T3 and R1 is connected to the output M of the half-bridge inverter connected.
- a first terminal of the primary winding P1 is connected to the Output or center tap M of the half-bridge inverter and with the lamp choke L1, while the second terminal of the primary winding P1 with the field effect transistor T3 and in DC forward direction via a diode D 1st with the high potential terminal (+) of the DC link capacitor C1 connected is.
- a first terminal of the measuring resistor R1 is connected to the ground potential (-), while the second terminal of the measuring resistor with the Field effect transistor T3 and a low-pass filter R2, C4 with the voltage input A of the microcontroller MC is connected.
- the load circuit L1, C2, LP By means of half the supply voltage of the half-bridge inverter charged Coupling capacitor C3 and the alternating switching transistors T1, T2 of the half-bridge inverter, the load circuit L1, C2, LP in a known manner subjected to a high-frequency alternating voltage whose frequency the switching clock of the transistors T1, T2 is determined and in the range of about 50 KHz up to 150 KHz.
- the transistor T3 is switched on and off by the microcontroller MC in synchronism with the transistor T1.
- the input voltage at terminal A of the Microcontroller MC is converted to digital by means of an analog-to-digital converter Signal converted and evaluated in the microcontroller MC.
- the heating phase of the electrode coils E1, E2 before igniting the gas discharge in the fluorescent lamp LP takes about 600 ms.
- the microcontroller MC detects the voltage drop across the capacitor C4 of the low-pass filter to two different Times during the heating phase off.
- the first detection of the voltage drop on the capacitor C4 through the microcontroller MC is about 30 ms after the start of the heating phase and the second detection at the end of the heating phase, that is, carried out about 600 ms after the start of the heating phase.
- a predetermined threshold exceeds, for example, 0.1 V, the detected at the end of the heating phase Voltage value for detecting the lamp type of the fluorescent lamp LP with a compared in the microcontroller MC stored reference value. If the threshold is not exceeded, there is no evaluation of the voltage drop on Capacitor C4 or on the measuring resistor R1.
- the time course of the voltage drop on the measuring resistor R1 and the capacitor C4 of the low-pass filter is with the time course of the electrical resistance of the electrode coils E1, E2 correlated during the heating phase.
- the heat resistance of the electrode coils E1, E2, that is, their resistance at the end of the heating phase is different for different Types of fluorescent lamps. Therefore, the heat resistance of the electrode coils can be used for Lampentyperkennung.
- Figures 2 to 4 show the time course of the voltage drop at the of primary-side current of the transformer P1, S1, S2 flowed through resistor R1 after averaging by the low-pass filter R2, C4 for three different operating states the circuit arrangement according to the preferred embodiment of Invention.
- the illustrated in Figure 2 time course of the voltage drop across the capacitor C4 corresponds to the operation of the circuit arrangement with a fluorescent lamp LP, whose electrode filaments E1, E2 were cold at the beginning of the heating phase, that is, Room temperature had.
- the voltage drop across the capacitor C4 therefore initially increases on, reaches a maximum of 0.48 V after approx. 30 ms and then steadily increases to assume a minimum of 0.22 V at the end of the heating phase after 600 ms.
- the maximum is with the cold resistance of the electrode coils E1, E2 and the Minimum at the end of the heating phase is with the heat resistance of the electrode coils E1, E2 correlates.
- the electrical resistance of tungsten existing Electrode coils E1, E2 is temperature-dependent, that is, it increases with increasing Temperature too.
- FIG. 3 shows the time profile of the voltage drop across the capacitor C4 for the same circuit arrangement and the same fluorescent lamp LP. Indeed were the electrode coils E1, E2 at the beginning of the heating phase, due to the last one Lamp operation, not yet completely cooled. Therefore has the illustrated in Figure 3 Voltage curve at about 30 ms a less pronounced maximum of only 0.27 V and the minimum of the curve is also at the end of the heating phase reached, but only 0.20 V.
- the illustrated in Figure 4 time course of the voltage drop across the capacitor C4 corresponds to the operation of the above circuit arrangement with an ohmic Replacement resistor instead of the electrode filaments E1 and E2 of the fluorescent lamp LP.
- the voltage drop across the capacitor C4 is apart from the rise during the first approximately 30 ms of the heating phase, regardless of the time and is approx. 0.22 V.
- the microcontroller MC detects the voltage drop across the capacitor C4 first time about 30 ms after the beginning of the heating phase and the second time about 600 ms after the beginning of the heating phase. If the absolute amount of the difference between the two Voltage values exceeds a predetermined threshold of, for example, 0.1 V, the voltage value at the end of the heating phase is in the microcontroller MC stored reference value compared and used for lamp type detection. This case is given only in the voltage curve shown in Figure 2. In the other two cases, that is, in those shown in Figures 3 and 4 Voltage curves is no evaluation with respect to the type of lamp type carried out. In these two cases are used for the operation of the circuit or the electronic control gear from the last lamp operation in Microcontroller MC uses stored data.
- a predetermined threshold for example, 0.1 V
- the Fluorescent lamp LP During dimming operation of the Fluorescent lamp LP are their electrode coils E1, E2 by means of the Transformers P1, S1, S2 and the transistor T3 supplied with a heating current, which flows in addition to the discharge current through the electrode coils E1, E2.
- the heating current or the heating power is dependent on the brightness of the Fluorescent lamp set. At low brightness, that is, with strong dimming the fluorescent lamp LP is set a high heat output.
- the heating power is changed by changing the pulse width of the transistor T3, in particular by changing the duty cycle of the transistor T3 is set.
- the transistor T3 becomes synchronous turned on to the transistor T1.
- the duty cycle of the transistor T3 is at maximum heating power 100% of the turn-on of the transistor T1. At lesser Heating power, the duty cycle of the transistor T3 is shorter than the duty cycle of the transistor T1.
- FIG. 5 shows a further circuit arrangement which is used the method according to the invention is particularly well suited.
- This circuit arrangement is largely identical to the circuit arrangement shown in FIG. Therefore, in the figures 1 and 5 identical components bear the same reference numerals.
- the circuit arrangement shown in FIG. 5 has two additional diodes D2, D3, each in series with a secondary winding S1 or S2 and an electrode coil E1 or E2 are connected.
- the arrangement of the diodes D2, D3 and the Winding sense of the transformer windings P1, S1, S2 is matched to one another, that the transformer, P1, S1, S2 with the diodes D2, D3 and the transistor T3 form a forward converter.
- the current is induced by the primary winding P1 in the secondary windings S1, S2 a heating current for the electrode coils E1, E2.
- the diodes D2, D3 poled in the reverse direction, so that while no heating current can flow.
- the energy stored in the primary winding P 1 is during the conducting phase of the transistor T2 via the diode D1 to the capacitor C 1 discharged.
- the invention is not limited to the embodiment described in more detail above. Rather than the voltage drop across resistor R1 during the preheat phase to evaluate the electrodes E1, E2 only at the beginning and at the end of the preheating phase, can by means of the microcontroller MC and the entire time course This voltage drop can be evaluated or only the maximum of the voltage drop at resistor R1 with the final value of this voltage drop at the end of Preheat phase are compared to a detection of the lamp type of low-pressure discharge lamp or fluorescent lamp LP.
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
- Figur 1
- Eine schematische Darstellung einer ersten Schaltungsanordnung zur Durchführung des erfindungsgemäßen Verfahrens
- Figur 2
- Den zeitlichen Verlauf des Spannungsabfalls an dem vom primärseitigen Strom des Transformators durchflossenen Widerstand nach Mittelung durch das Tiefpassfilter für einen ersten Betriebszustand
- Figur 3
- Den zeitlichen Verlauf des Spannungsabfalls an dem vom primärseitigen Strom des Transformators durchflossenen Widerstand nach Mittelung durch das Tiefpassfilter für einen zweiten Betriebszustand
- Figur 4
- Den zeitlichen Verlauf des Spannungsabfalls an dem vom primärseitigen Strom des Transformators durchflossenen Widerstand nach Mittelung durch das Tiefpassfilter für einen dritten Betriebszustand
- Figur 5
- Eine schematische Darstellung einer zweiten Schaltungsanordnung zur Durchführung des erfindungsgemäßen Verfahrens
Claims (7)
- Verfahren zum Betreiben mindestens einer Niederdruckentladungslampe mittels eines Wechselrichters, wobei die Lampenelektroden (E1, E2) der mindestens einen Niederdruckentladungslampe (LP) während einer Heizphase vor dem Zünden der Gasentladung in der mindestens einen Niederdruckentladungslampe (LP) mittels eines Transformators (P1, S1, S2), dessen primärseitiger Strom mittels eines steuerbaren Schaltmittels (T3) getaktet wird, mit einem Heizstrom beaufschlagt werden und die Änderung des elektrischen Widerstands mindestens einer Lampenelektrode (E1, E2) überwacht wird, dadurch gekennzeichnet, dass das steuerbare Schaltmittel (T3) synchron zu einem ersten Wechselrichterschaltmittel (T1) geschaltet wird und die Änderung des elektrischen Widerstands der mindestens einen Lampenelektrode (E1, E2) mittels eines Widerstandselementes (R1), das auf der Primärseite des Transformators (P1, S1, S2) angeordnet ist, bestimmt wird, indem der Spannungsabfall über dem Widerstandselement (R1) an mindestens zwei unterschiedlichen Zeitpunkten während der Heizphase ausgewertet wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Spannungsabfall über dem Widerstandselement (R1) mittels eines Tiefpassfilters (R2, C4) ausgewertet wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die in der Primärwicklung (P1) gespeicherte Energie während der Ausschaltdauer des steuerbaren Schaltmittels (T3) mit Hilfe eines zweiten Wechselrichterschaltmittels (T2) und einer Diodenschaltung (D1) abgeführt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein erster Zeitpunkt, an dem der Spannungsabfall über dem Widerstandselement (R1) ausgewertet wird, in einem Zeitfenster von 10 ms bis 50 ms nach dem Beginn der Heizphase angeordnet ist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein maximaler Wert des Spannungsabfalls über dem Widerstandselement (R1) ermittelt wird.
- Verfahren nach Anspruch 1, 4 oder 5, dadurch gekennzeichnet, dass ein zweiter Zeitpunktpunkt, an dem der Spannungsabfall über dem Widerstandselement (R1) ausgewertet wird, am Ende der Heizphase angeordnet ist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass nach dem Zünden der Gasentladung in der mindestens einen Niederdruckentladungslampe (LP) der Spannungsabfall über dem Widerstandselement (R1) zur Regelung der Heizleistung der Lampenelektroden (E1, E2) ausgewertet wird und die Heizleistung durch Verändern der Einschaltdauer des steuerbaren Schaltmittels (T3) variiert wird, wobei das steuerbare Schaltmittel (T3) synchron mit dem ersten Wechselrichterschaltmittel (T1) eingeschaltet wird und seine Einschaltdauer kleiner oder gleich der Einschaltdauer des ersten Wechselrichterschaltmittels (T1) ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE10345610 | 2003-09-29 | ||
DE10345610A DE10345610A1 (de) | 2003-09-29 | 2003-09-29 | Verfahren zum Betreiben mindestens einer Niederdruckentladungslampe |
Publications (2)
Publication Number | Publication Date |
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EP1519638A1 true EP1519638A1 (de) | 2005-03-30 |
EP1519638B1 EP1519638B1 (de) | 2007-04-04 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04019957A Not-in-force EP1519638B1 (de) | 2003-09-29 | 2004-08-23 | Verfahren zum Betreiben mindestens einer Niederdruckentladungslampe |
Country Status (7)
Country | Link |
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US (1) | US6972531B2 (de) |
EP (1) | EP1519638B1 (de) |
JP (1) | JP4652002B2 (de) |
CN (1) | CN100566496C (de) |
AT (1) | ATE358964T1 (de) |
CA (1) | CA2482665A1 (de) |
DE (2) | DE10345610A1 (de) |
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EP1860925A1 (de) * | 2006-05-26 | 2007-11-28 | TridonicAtco GmbH & Co. KG | Elektronisches Lampenvorschaltgerät mit Heizschaltung |
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JP4145795B2 (ja) * | 2001-10-18 | 2008-09-03 | 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 | 短絡安定器の保護 |
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2004
- 2004-08-23 DE DE502004003377T patent/DE502004003377D1/de active Active
- 2004-08-23 AT AT04019957T patent/ATE358964T1/de not_active IP Right Cessation
- 2004-08-23 EP EP04019957A patent/EP1519638B1/de not_active Not-in-force
- 2004-09-21 US US10/944,849 patent/US6972531B2/en active Active
- 2004-09-28 CA CA002482665A patent/CA2482665A1/en not_active Abandoned
- 2004-09-28 JP JP2004281243A patent/JP4652002B2/ja not_active Expired - Fee Related
- 2004-09-29 CN CNB2004100820986A patent/CN100566496C/zh not_active Expired - Fee Related
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Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2007036514A1 (de) * | 2005-09-28 | 2007-04-05 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Verfahren zum einstellen eines elektronischen vorschaltgeräts |
AU2006296603B2 (en) * | 2005-09-28 | 2011-06-30 | Osram Ag | Method for setting an electronic ballast |
US7898190B2 (en) | 2005-09-28 | 2011-03-01 | Osram Gesellschaft Mit Beschraenkter Haftung | Method for setting an electronic ballast |
EP1860925A1 (de) * | 2006-05-26 | 2007-11-28 | TridonicAtco GmbH & Co. KG | Elektronisches Lampenvorschaltgerät mit Heizschaltung |
EP2003937A1 (de) * | 2007-06-14 | 2008-12-17 | Gigno Technology Co., Ltd. | Antriebsverfahren und Steuerverfahren einer Heißkathodenleuchtstofflampe und Verfahren zur Schätzung der Fadentemperatur in einer Heißkathodenleuchtstofflampe |
WO2009046891A1 (de) * | 2007-10-02 | 2009-04-16 | Tridonicatco Gmbh & Co. Kg | Verfahren zum bestimmen von betriebsparametern einer mit einem elektronischen vorschaltgerät zu betreibenden gasentladungslampe sowie ein entsprechendes vorschaltgerät |
WO2009109326A1 (de) * | 2008-03-04 | 2009-09-11 | Tridonicatco Gmbh & Co. Kg | Schaltung zum beheizen und überwachen der heizwendeln mindestens einer mit einem evg betriebenen gasentladungslampe sowie beleuchtungssystem |
DE102008012452A1 (de) * | 2008-03-04 | 2009-09-10 | Tridonicatco Gmbh & Co. Kg | Schaltung zum Beheizen und Überwachen der Heizwendeln mindestens einer mit einem elektronischen Vorschaltgerät betriebenen Gasentladungslampe auf Wendelbruch |
DE102008022198A1 (de) | 2008-03-04 | 2009-09-10 | Tridonicatco Gmbh & Co. Kg | Typerkennung einer mit einem elektronischen Vorschaltgerät zu betreibenden Gasentladungslampe |
WO2009109325A1 (de) * | 2008-03-04 | 2009-09-11 | Tridonicatco Gmbh & Co. Kg | Typerkennung einer mit einem elektronischen vorschaltgerät zu betreibenden gasentladungslampe |
DE102008012454A1 (de) | 2008-03-04 | 2009-09-10 | Tridonicatco Gmbh & Co. Kg | Verfahren zum Bestimmen von Betriebsparametern einer mit einem elektronischen Vorschaltgerät zu betreibenden Gasentladungslampe sowie ein entsprechendes Vorschaltgerät |
CN102027809A (zh) * | 2008-03-04 | 2011-04-20 | 三多尼克两合股份有限公司 | 照明系统和检测要由电子镇流器操作的至少两个气体放电灯是否属于相同类型的方法 |
DE102008012453A1 (de) | 2008-03-04 | 2009-09-10 | Tridonicatco Gmbh & Co. Kg | Verfahren zum Prüfen, ob mindestens zwei mit einem elektronischen Vorschaltgerät zu betreibende Gasentladungslampen vom gleichen Typ sind |
EP2355626A2 (de) | 2008-03-04 | 2011-08-10 | Tridonic GmbH & Co KG | Beleuchtungssystem und Verfahren zum Prüfen, ob mindestens zwei mit einem EVG zu betreibende Gasentladungslampen vom gleichen Typ sind |
CN102027809B (zh) * | 2008-03-04 | 2014-10-01 | 三多尼克两合股份有限公司 | 照明系统和检测要由电子镇流器操作的至少两个气体放电灯是否属于相同类型的方法 |
AT517953A5 (de) * | 2008-03-04 | 2017-06-15 | Tridonic Gmbh & Co Kg | Beleuchtungssystem und verfahren zum prüfen, ob mindestens zwei mit einem evg zu betreibende gasentladungslampen vom gleichen typ sind |
AT517953B1 (de) * | 2008-03-04 | 2017-06-15 | Tridonic Gmbh & Co Kg | Beleuchtungssystem und verfahren zum prüfen, ob mindestens zwei mit einem evg zu betreibende gasentladungslampen vom gleichen typ sind |
WO2010121964A1 (en) | 2009-04-24 | 2010-10-28 | Osram Gesellschaft mit beschränkter Haftung | Lamp-coupler-unit for electrodeless high intensity discharge (ehid) lamps with a data memory and communication and an impedance-controlled feedthrough and electrodeless high intensity discharge system with such lamp-coupler-unit |
WO2010150151A3 (en) * | 2009-06-24 | 2011-03-24 | Koninklijke Philips Electronics N.V. | Electronic ballast for a fluorescent lamp |
Also Published As
Publication number | Publication date |
---|---|
JP4652002B2 (ja) | 2011-03-16 |
DE502004003377D1 (de) | 2007-05-16 |
CN100566496C (zh) | 2009-12-02 |
DE10345610A1 (de) | 2005-05-12 |
US6972531B2 (en) | 2005-12-06 |
EP1519638B1 (de) | 2007-04-04 |
CA2482665A1 (en) | 2005-03-29 |
CN1638593A (zh) | 2005-07-13 |
JP2005108841A (ja) | 2005-04-21 |
US20050067980A1 (en) | 2005-03-31 |
ATE358964T1 (de) | 2007-04-15 |
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