EP1424881A1 - Dispositif et méthode pour commander une lampe fluorescente - Google Patents

Dispositif et méthode pour commander une lampe fluorescente Download PDF

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Publication number
EP1424881A1
EP1424881A1 EP03025649A EP03025649A EP1424881A1 EP 1424881 A1 EP1424881 A1 EP 1424881A1 EP 03025649 A EP03025649 A EP 03025649A EP 03025649 A EP03025649 A EP 03025649A EP 1424881 A1 EP1424881 A1 EP 1424881A1
Authority
EP
European Patent Office
Prior art keywords
low
discharge lamp
pressure discharge
voltage
inverter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03025649A
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German (de)
English (en)
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EP1424881B1 (fr
Inventor
Jörg Dr. Lott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of EP1424881A1 publication Critical patent/EP1424881A1/fr
Application granted granted Critical
Publication of EP1424881B1 publication Critical patent/EP1424881B1/fr
Anticipated expiration legal-status Critical
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the invention relates to a method for operating at least one low-pressure discharge lamp on an inverter according to the preamble of the claim 1 and an operating device for at least one low-pressure discharge lamp according to the Claim 12.
  • Such an operating method is, for example, in the international patent application with publication number WO 99/56506.
  • This document describes the operation of a low-pressure discharge lamp on a circuit arrangement, a half-bridge inverter with a load circuit connected to it has, in which the connections for the lamp are arranged. To the appearance of the The rectifier effect in the low-pressure discharge lamp is detected Voltage drop across the half-bridge capacitor is monitored and when exceeded a predetermined upper limit or when falling below a predetermined lower limit will be a shutdown device for the half-bridge inverter activated.
  • the method according to the invention for operating at least one low-pressure discharge lamp on an inverter is characterized in that for monitoring the occurrence of the rectifier effect in the at least one low-pressure discharge lamp the DC voltage drop across the electrical connections of the at least one low pressure discharge lamp that is fed into the inverter electrical power or a proportional first quantity and one with correlated with the operating voltage of the at least one low-pressure discharge lamp second size can be evaluated to determine a criterion for the existence the rectifier effect in the at least one low-pressure discharge lamp and thus also a criterion for reaching the end of the service life of the minimum to define a low pressure discharge lamp.
  • the occurrence of the rectifier effect can be independent of the lamp used and the current dimming position with sufficient Accuracy can be determined.
  • the method according to the invention increases the reliability of the system consisting of the at least one low-pressure discharge lamp and the control gear, since the tolerance range for the determination of the End of life of the at least one low-pressure discharge lamp by means of the three aforementioned sizes can be specified more precisely and in this way one Shutdown of the control gear due to incorrect detection of the rectifier effect is avoided.
  • the operating voltage of the at least one low-pressure discharge lamp correlated second quantity is advantageously the effective value of the AC voltage component of the operating voltage of the at least one low-pressure discharge lamp.
  • this second size can also be a constant Be the value for the lamp type of the at least one low-pressure discharge lamp corresponds to the characteristic mean value of the burning voltage.
  • the above is Average value, for example, 145 V and for a T5 fluorescent lamp with a power consumption of 54 watts, the above average is, for example, 118 V.
  • the electrical power fed into the inverter it can also a variable proportional to it can be evaluated.
  • the active component of the current flowing through the inverter is particularly suitable for this the active component of the current flowing through the inverter. Because the inverter usually supplied with an approximately constant DC voltage the active component of the current flowing through the inverter is proportional to the electrical power fed into the inverter. To determine the Active component of the aforementioned current will preferably be the voltage drop a resistance evaluated during a switching phase of the inverter is flowed through by the entire current of the inverter. This voltage drop is also proportional to the electrical fed into the inverter Power.
  • the product is advantageously used to evaluate the above-mentioned variables the electrical power fed into the inverter and the quotient of the DC voltage drop across the electrical connections of the at least one Low pressure discharge lamp and with the operating voltage of the at least one Low pressure discharge lamp correlated second size with a predetermined Power value compared because this product from the fed into the inverter electrical power and the quotient of the aforementioned voltages directly a measure of the asymmetry of the emission behavior of the lamp electrodes and the result provides a value for electrical power that is immediately associated with the permissible maximum value that can be compared in the supplement to Standard IEC 61347-2-3 "Particular requirements for a.c. supplied electronic ballasts for fluorescent lamps "is specified under test 2" Asymmetric Power Dissipation ". This maximum value is 7.5 watts for T5 lamps and 5.0 watts for T4 lamps.
  • the product of a given performance value and that with the Burning voltage of the at least one low-pressure discharge lamp correlated second size with the product of the electrical fed into the inverter Power and the DC voltage drop across the electrical connections compared to the at least one low-pressure discharge lamp.
  • a default Power value becomes the maximum allowed value of the 2 "Asymmetric test cited above Power Dissipation "from the supplement to the IEC 61347-2-3 standard. Then this comparison is equivalent to that described in the previous paragraph Comparison.
  • the comparison is updated throughout the lamp operation with updated values of the three aforementioned quantities are repeated continuously in order to Rectifier effect to avoid overheating of the lamp electrodes.
  • a counting process is carried out and a status bit is set or reset in the event of a counter overflow. The status of the status bit is thus an indicator of whether the at least one low-pressure discharge lamp has already reached the end of its service life.
  • the evaluation is advantageously carried out with the aid of a microcontroller in which a corresponding program for carrying out the comparisons has been implemented.
  • the microcontroller can also control the driver circuits for the transistor switches of the inverter.
  • the electrical power fed into the inverter is advantageously from the voltage drop across a voltage divider that is parallel to the input of the inverter is arranged, and from the voltage drop across a resistor, which during a switching phase of the inverter in series with an inverter transistor is switched and meanwhile by the current of at least a low-pressure discharge lamp is traversed.
  • the voltage drop at the aforementioned resistor in addition to the brightness control at least one low-pressure discharge lamp can be used.
  • the same measurements can therefore, for example, with the help of a microcontroller both for brightness control as well as for the detection of the end of life of the at least one Low pressure discharge lamp can be evaluated.
  • the operating device described above enables the implementation of the invention Operating method.
  • the operating device according to the invention shown schematically in FIG it is an electronic ballast for the operation of two connected in parallel Low-pressure discharge lamps, in particular T5 fluorescent lamps FL1, FL2.
  • this ballast also enables brightness regulation fluorescent lamps FL1, FL2.
  • the ballast has two mains voltage connections 1, 2, one downstream Mains voltage rectifier GL, which also includes a filter circuit and, if necessary comprises a step-up converter and at its voltage output the supply voltage provided for the downstream half-bridge inverter becomes.
  • the half-bridge inverter has two half-bridge transistors T1, T2 at the center tap M a load circuit designed as a series resonant circuit is connected, the resonance inductor L1 and the resonance capacitor C1 includes.
  • a parallel circuit is provided in parallel with the resonance capacitor C1 arranged from two fluorescent lamps FL1, FL2. This parallel connection has two half-bridge capacitors C2, C3, each in series with one of the Fluorescent lamps FL1 and FL2 are arranged.
  • the branch is in each branch Parallel connection of a winding N1 or N2 of a balancing transformer L2 switched, which serves to symmetrize the lamp currents in the two branches.
  • Connection A2 of the first half-bridge capacitor which is at high potential C2 is via winding N2 of transformer L2, electrode E2 of the first Fluorescent lamp FL1 and resistor R1 with the positive DC voltage output of the mains voltage rectifier GL connected.
  • high potential connection A3 of the second half-bridge capacitor C3 via the winding N1 of the transformer L2, the electrode E4 of the second fluorescent lamp FL2 and resistor R2 with the positive DC voltage output of the mains voltage rectifier GL connected.
  • connection A1 of the resonance capacitor C1 is connected to the Electrode E1 of the first fluorescent lamp FL1 and electrode E3 of the second Fluorescent lamp connected and via the resonance inductor L1 to the center tap M of the half-bridge inverter connected.
  • the other connection of the Resonant capacitor C1 is connected to the negative DC voltage output of the mains voltage rectifier GL and the ground potential connected.
  • the Connection A1 via the electrode E1 and the resistor R3 with the positive DC voltage output of the mains voltage rectifier GL connected.
  • heater H is inductive to all electrodes E1, E2, E3, E4 of the two fluorescent lamps FL1, FL2 coupled and used for Heating the lamp electrodes before igniting the gas discharge or also during dimming of the lamps. Details of this heater H are for example in published patent application EP 0 748 146 A1.
  • the resistances R0, R1, R2 and R3 are used to set the potentials at the taps A1, A2 and A3.
  • the corresponding ones in the lamps FL1, FL2 on the capacitors C1, C2 and C3 build up electrical voltages.
  • the half-bridge transistors T1, T2 are controlled with the aid of the program-controlled working microcontroller MC and the driver circuits TR for the Transistors T1, T2.
  • the Center tap M alternating with the negative and the positive DC voltage output of the mains voltage rectifier GL connected.
  • the half-bridge capacitors C2, C3 to half the supply voltage of the half-bridge inverter charged flows between the lamps during lamp operation Taps M and A2 or A3 a high-frequency alternating current, its frequency is determined by the switching clock of the transistors T1, T2.
  • the switching cycle of the half-bridge transistors is in the fluorescent lamps FL1, FL2 T1, T2 changed such that the frequency of the alternating current in the load circuit is close to the resonance frequency of the series resonance circuit L1, C1. Thereby a sufficiently high voltage is generated at the resonance capacitor C1, to ignite the gas discharge in the fluorescent lamps FL1, FL2. After this Ignition of the gas discharge in the fluorescent lamps FL1, FL2 becomes the series resonance circuit L1, C1 damped by the parallel connection of the fluorescent lamps FL1, FL2.
  • the brightness control of the fluorescent lamps FL1, FL2 is also carried out by changing the frequency of the alternating current in the load circuit and in the parallel connection fluorescent lamps FL1, FL2.
  • the resistor R4 is arranged so that its connection A4 over the Switching distance of the transistor T2 can be connected to the center tap M and be another connection with the ground potential and with the negative DC voltage output of the mains voltage rectifier GL is connected.
  • the half-bridge transistor T2 is conductive, the whole flows through the resistor R4 Current of the load circuit and the parallel connection of the fluorescent lamps FL1, FL2.
  • the low-pass filter R5, C4 the voltage drop across resistor R4 is measured.
  • the voltage divider is parallel to the half-bridge capacitor C3 R8, R9 with the capacitor C6 connected in parallel with the resistor R9.
  • the voltage U3 measured, which is proportional to the voltage drop across the half-bridge capacitor C3 is.
  • the voltage U4 is measured, which is proportional to the voltage drop across the Half bridge capacitor C2 is.
  • connection A1 of the resonance capacitor is C1 via the capacitor C8, the resistor R12 and the reverse polarity diode D1 connected to the ground potential.
  • a tap between the resistance R 12 and the cathode of diode D1 is across the forward polarized diode D2 and the resistor R13 connected to the ground potential.
  • Parallel to that Resistor R13 capacitor C9 is connected.
  • the one on the cathode of the diode D2 connected connector A9 of resistor R13 is with the corresponding Connection A9 of the microcontroller MC connected.
  • connection A9 the Voltage U5 measured, which is in good approximation proportional to the effective value of the AC voltage component of the operating voltage of the fluorescent lamps connected in parallel FL1, FL2 is.
  • the voltages U1 to U5 present at the connections A5, A6, A7, A8 and A9 are converted into digital values by means of an analog-digital converter and evaluated by the microcontroller MC with the aid of a program implemented in the microcontroller in order to be transmitted via a driver circuit TR appropriate control of the half-bridge transistors T1, T2 to ensure brightness control of the fluorescent lamps FL1, FL2 and detection of the end of life of the lamps FL1, FL2.
  • the end of the life of the lamps FL1, FL2 is determined by monitoring the occurrence of the rectifier effect in the fluorescent lamps FL1 FL2.
  • the microcontroller MC is used to feed the electrical power P fed into the half-bridge inverter , the DC voltage drop U dc1 or U dc2 via the electrical connections of the fluorescent lamps FL1, FL2 and the effective value U ac of the AC voltage component of the operating voltage of the fluorescent lamps FL1, FL2 connected in parallel evaluated.
  • the DC voltage drop U dc1 across the electrical connections of the fluorescent lamp FL1 is calculated from the difference between half the supply voltage of the half-bridge inverter and the voltage drop across the half-bridge capacitor C2 and can therefore be determined from the voltages U2 and U4.
  • U dc 1 1 2 ⁇ U 2 ⁇ R 6+ R 7 R 7 - U 4 ⁇ R 10+ R 11 R 11
  • the DC voltage drop U dc2 across the electrical connections of the fluorescent lamp FL2 is calculated from the difference between half the supply voltage of the half-bridge inverter and the voltage drop across the half-bridge capacitor C3 and can therefore be determined from the voltages U2 and U3.
  • U dc 2 1 2 ⁇ U 2 ⁇ R 6+ R 7 R 7 - U 3 ⁇ R 8+ R 9 R 9
  • U ac respectively. P 2 P ⁇
  • the electrical power consumption P of the half-bridge inverter is determined from the measured values U1 and U2 updated during each cycle of the method according to the formula (1) by means of the program implemented in the microcontroller MC.
  • the product P max ⁇ U ac is then calculated from the measured value U5 likewise updated during each cycle of the method in accordance with the formula (4).
  • the status of the status bit S0 is then checked, which indicates whether the lamp FL1 has been checked during the last cycle carried out, in which case it then continues to check the lamp FL2.
  • the status bit S0 is set and then according to the formula (2) from the measured values of the voltages U2 also updated during each cycle of the method and U4 determines the DC voltage component across the connections of the lamp FL1 and, according to the formula (6a), forms the product of the amount of this DC voltage component U dc1 and the power consumption P of the half-bridge inverter . Then it is checked whether the condition (6a) is fulfilled, that is, whether the value of the product P ⁇
  • the counter reading Z1 becomes a first counter increased by 1. Then it is checked whether the counter reading Z1 of the first Counter has the value zero and thus a counter overflow that occurs at the value 256 has occurred. If so, status bit S1 is set, which is the end indicates the life of the lamp FL1, and the current cycle of the process completed. If the counter reading Z1 of the first counter is greater than zero, the current one Counter reading Z1 is saved and the current cycle is exited.
  • condition (6a) a check is carried out to determine whether the counter reading Z1 is zero and in this case leave the current cycle. If the counter reading Z1 was greater than zero, the counter reading Z1 is decreased by one and then checked again, whether it is still greater than zero. If the counter reading is now zero, it will Status bit S1, which indicates the occurrence of the end of life of the lamp FL1 deleted or reset and the counter reading Z1 saved. Otherwise only the counter reading Z1 is saved. Then the current one in both cases Leave cycle.
  • the monitoring of the other fluorescent lamp FL2 is completely analogous to this.
  • the fluorescent lamp was turned off during the last cycle of the monitoring process Checked FL1, status bit S0 is set and the program or algorithm branches into the branch for monitoring the lamp FL2, as in the Flow chart of Figure 2 is shown.
  • the status bit S0 is set, that is to say that the lamp FL1 was checked during the last cycle carried out, the status bit S0 is reset and then according to the formula (2) from the measured values of the voltages U2 and U3 also updated during each cycle of the method the DC voltage component across the connections of the lamp FL2 is determined and, according to the formula (6b), the product is formed from the amount of this DC voltage component U dc2 and the power consumption P of the half-bridge inverter . Then it is checked whether the condition (6b) is fulfilled, that is, whether the value of the product P ⁇
  • the counter reading Z2 becomes a second Counter increased by the value 1. Then it is checked whether the counter reading Z2 of the second Counter has the value zero and thus a counter overflow at the value 256 occurs. If so, status bit S2 is set, which is the Indicates end of lamp life FL2, and the current cycle of the procedure completed. If the counter reading Z2 of the second counter is greater than zero, the current counter reading Z2 is saved and the current cycle is exited.
  • a check is carried out to determine whether the counter reading Z2 is zero and in this case leave the current cycle. If the counter reading Z2 was greater than zero, the counter reading Z2 is decreased by one and then checked again, whether it is still greater than zero. If the counter reading is now zero, it will Status bit S2, which indicates the occurrence of the end of life of the lamp FL2 deleted or reset and the counter reading Z2 saved. Otherwise only the counter reading Z2 is saved. Then the current one in both cases Leave cycle.
  • status bit S1 or status bit S2 is longer than a predefined one Duration, that is, for example, for a predetermined number of successive
  • the operating device becomes monitoring cycles in the set state off.
  • the invention is not limited to the exemplary embodiment explained in more detail above.
  • the lamps FL1, FL2 can be queried in the same cycle instead of alternately.
  • the counter readings Z1, Z2 can be increased or decreased by a value greater than 1 if the permissible limit value is exceeded or undershot.
  • Other evaluation methods can also be used.
  • P maxU ac for both lamps FL1, FL2 are formed and evaluated.
  • the values of the aforementioned difference can be added up at different times during lamp operation by means of integration elements in order to monitor the exceeding or falling short of predetermined upper or lower limit values.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP03025649A 2002-11-28 2003-11-05 Dispositif et méthode pour commander une lampe fluorescente Expired - Lifetime EP1424881B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10255737 2002-11-28
DE10255737A DE10255737A1 (de) 2002-11-28 2002-11-28 Verfahren zum Betrieb mindestens einer Niederdruckentladungslampe und Betriebsgerät für mindestens eine Niederdruckentladungslampe

Publications (2)

Publication Number Publication Date
EP1424881A1 true EP1424881A1 (fr) 2004-06-02
EP1424881B1 EP1424881B1 (fr) 2006-08-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03025649A Expired - Lifetime EP1424881B1 (fr) 2002-11-28 2003-11-05 Dispositif et méthode pour commander une lampe fluorescente

Country Status (5)

Country Link
US (1) US6930454B2 (fr)
EP (1) EP1424881B1 (fr)
AT (1) ATE337695T1 (fr)
CA (1) CA2450918A1 (fr)
DE (2) DE10255737A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010072719A1 (fr) * 2008-12-22 2010-07-01 Tridonicatco Gmbh & Co. Kg Procédé et ballast pour le fonctionnement d'un moyen d'éclairage avec un courant régulé

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KR101133752B1 (ko) 2004-06-04 2012-04-09 삼성전자주식회사 표시 장치용 광원의 구동 장치 및 표시 장치
US7365597B2 (en) * 2005-08-19 2008-04-29 Micron Technology, Inc. Switched capacitor amplifier with higher gain and improved closed-loop gain accuracy
US7489531B2 (en) 2006-09-28 2009-02-10 Osram Sylvania, Inc. Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor
DE102009019625B4 (de) * 2009-04-30 2014-05-15 Osram Gmbh Verfahren zum Ermitteln eines Typs einer Gasentladungslampe und elektronisches Vorschaltgerät zum Betreiben von mindestens zwei unterschiedlichen Typen von Gasentladungslampen
EP2315505A1 (fr) * 2009-10-15 2011-04-27 Nxp B.V. Procédé de contrôle d'un circuit à demi-pont, et circuit à demi-pont commandé avec celui-ci
DE102010030826A1 (de) * 2010-07-01 2012-01-05 Robert Bosch Gmbh Verfahren und Schaltungsanordnung zur Diagnose eines Lastpfades in einem Fahrzeug
CN102914734B (zh) * 2011-08-04 2015-04-08 台达电子企业管理（上海）有限公司 气体放电灯寿终检测电路及其所适用的安定器

Citations (5)

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DE19708792A1 (de) * 1997-03-04 1998-09-10 Tridonic Bauelemente Verfahren und Vorrichtung zum Erfassen des in einer Gasentladungslampe auftretenden Gleichrichteffekts
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
EP0886460A1 (fr) * 1997-06-18 1998-12-23 Oy Helvar Ballast électronique avec circuit detécteur du courant de lampe rectifiée
EP1003357A1 (fr) * 1996-03-14 2000-05-24 Mitsubishi Denki Kabushiki Kaisha Ballast pour lampe à décharge
US6291944B1 (en) * 2000-05-05 2001-09-18 Universal Lighting Technologies, Inc. System and method for limiting through-lamp ground fault currents in non-isolated electronic ballasts

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DE4140557A1 (de) * 1991-12-09 1993-06-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb einer oder mehrerer niederdruckentladungslampen
DE19715342C1 (de) * 1997-04-12 1998-12-17 Vossloh Schwabe Gmbh Vorschaltgerät für unabhängigen Parallelbetrieb von Niederdruck-Gasentladungslampen
DE19715341C1 (de) * 1997-04-12 1998-10-15 Vossloh Schwabe Gmbh Elektronisches Vorschaltgerät mit automatischem Wiederanlauf
DE19819027A1 (de) 1998-04-29 1999-11-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
EP1003357A1 (fr) * 1996-03-14 2000-05-24 Mitsubishi Denki Kabushiki Kaisha Ballast pour lampe à décharge
US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
DE19708792A1 (de) * 1997-03-04 1998-09-10 Tridonic Bauelemente Verfahren und Vorrichtung zum Erfassen des in einer Gasentladungslampe auftretenden Gleichrichteffekts
EP0886460A1 (fr) * 1997-06-18 1998-12-23 Oy Helvar Ballast électronique avec circuit detécteur du courant de lampe rectifiée
US6291944B1 (en) * 2000-05-05 2001-09-18 Universal Lighting Technologies, Inc. System and method for limiting through-lamp ground fault currents in non-isolated electronic ballasts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010072719A1 (fr) * 2008-12-22 2010-07-01 Tridonicatco Gmbh & Co. Kg Procédé et ballast pour le fonctionnement d'un moyen d'éclairage avec un courant régulé

Also Published As

Publication number Publication date
US20040104691A1 (en) 2004-06-03
US6930454B2 (en) 2005-08-16
DE10255737A1 (de) 2004-06-09
EP1424881B1 (fr) 2006-08-23
DE50304728D1 (de) 2006-10-05
ATE337695T1 (de) 2006-09-15
CA2450918A1 (fr) 2004-05-28

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