EP1492393A1 - Circuit et méthode pour alimenter une lampe à décharge muni d'une détection de fin de durée de vie - Google Patents

Circuit et méthode pour alimenter une lampe à décharge muni d'une détection de fin de durée de vie Download PDF

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Publication number
EP1492393A1
EP1492393A1 EP04009750A EP04009750A EP1492393A1 EP 1492393 A1 EP1492393 A1 EP 1492393A1 EP 04009750 A EP04009750 A EP 04009750A EP 04009750 A EP04009750 A EP 04009750A EP 1492393 A1 EP1492393 A1 EP 1492393A1
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EP
European Patent Office
Prior art keywords
low
pressure discharge
discharge lamp
voltage
proportional
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
EP04009750A
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German (de)
English (en)
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EP1492393B1 (fr
EP1492393B8 (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
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Publication of EP1492393A1 publication Critical patent/EP1492393A1/fr
Publication of EP1492393B1 publication Critical patent/EP1492393B1/fr
Application granted granted Critical
Publication of EP1492393B8 publication Critical patent/EP1492393B8/fr
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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 method for operating at least one low-pressure discharge lamp on an inverter according to the preamble of patent claim 1 and an operating device for at least one low-pressure discharge lamp according to claim 9.
  • Rectifier effect in the at least one low-pressure discharge lamp allows and in particular avoids shutdowns of the operating device due to incorrect detection of the rectifier effect.
  • 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 terminals of the at least one low-pressure discharge lamp and the current through the at least one low-pressure discharge lamp or a thereto proportional size to be evaluated in order to define a criterion for the presence of the rectifier effect in the at least one low-pressure discharge lamp and thus a criterion for reaching the end of life of the at least one low-pressure discharge lamp.
  • the method according to the invention increases the reliability of the system consisting of the at least one low-pressure discharge lamp and the operating device, since the tolerance range for determining the end of life of the at least one low-pressure discharge lamp by means of the aforementioned variables can be specified more precisely and in this way a shutdown of the operating device due to an erroneous detection the rectifier effect is avoided.
  • the product from the current through the at least one low-pressure discharge lamp and the DC voltage drop across the electrical terminals of the at least one low-pressure discharge lamp is advantageously compared with a predetermined power value, since this product directly represents a measure of the asymmetry of the emission behavior of the lamp electrodes and the Result provides a value for electrical power that can be directly compared to the maximum allowable value specified in the supplement to the IEC 61347-2-3 standard fluorescent lamps "under test 2" Asymmetric Power Dissipation. "This maximum value is 7.5 watts for T5 lamps and 5.0 watts for T4 lamps.
  • the comparison is repeated continuously throughout the lamp operation with updated values of the aforementioned magnitudes, in order to avoid overheating of the lamp electrodes in the event of the occurrence of the rectifier effect.
  • a counting operation is advantageously carried out depending on the result of the comparison and in the case of a counter overflow or when an upper Counter threshold one status bit set or reset. The status of the status bit is thus an indicator of whether the at least one low-pressure discharge lamp has already reached its end of 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 additionally take over the control of the driver circuits for the transistor switches of the inverter.
  • the values for the difference of a predefined power value and the product from the DC voltage drop across the electrical connections of the at least one low-pressure discharge lamp and the current through the at least one low-pressure discharge lamp or a variable proportional thereto are preferably added up at different times of the lamp operation.
  • the current through the at least one low-pressure discharge lamp or the variable proportional thereto is advantageously determined by means of a resistor which is connected in series with the at least one low-pressure discharge lamp during a half-wave of the current through the at least one low-pressure discharge lamp, for example during the positive half-wave.
  • the current through the at least one low-pressure discharge lamp is determined from the voltage drop across this resistor, preferably after smoothing by means of a low-pass filter connected downstream of the resistor.
  • the voltage drop across the aforementioned resistor can additionally: be used for brightness control of at least one Niederdruckentladungslainpe. The same measured values can therefore be evaluated, for example with the aid of a microcontroller, both for controlling the brightness and for detecting the end of life of the at least one low-pressure discharge lamp.
  • the operating device described above makes it possible to carry out the operating method according to the invention.
  • the inventive operating device schematically illustrated in FIG. 1 is an electronic ballast for operating two parallel-connected low-pressure discharge lamps, in particular T5 fluorescent lamps FL1, FL2.
  • This ballast in particular also allows brightness regulation of the fluorescent lamps FL1, FL2.
  • the ballast has two mains voltage terminals 1, 2, a downstream mains voltage rectifier GL, which also includes a filter circuit and optionally a boost converter and at the voltage output, the supply voltage for the downstream half-bridge inverter is provided.
  • the half-bridge inverter has two half-bridge transistors T1, T2, at whose center tap M a load circuit formed as a series resonant circuit is connected, which comprises the resonance inductance L 1 and the resonance capacitor C 1.
  • Parallel to the resonance capacitor C1 a parallel circuit consisting of two fluorescent lamps FL1, FL2 is arranged.
  • This parallel circuit has two half-bridge capacitors C2, C3, which are each arranged in series with one of the fluorescent lamps FL1 and FL2.
  • a winding N1 or N2 of a balancing transformer L2 is connected, which serves to balance the lamp currents in the two branches.
  • the high-potential terminal A2 of the first half-bridge capacitor C2 is connected through the winding N2 of the transformer L2, the electrode E2 of the first fluorescent lamp FL1 and the resistor R1 to the positive DC voltage output of the mains voltage rectifier GL.
  • the high-potential terminal A3 of the second half-bridge capacitor C3 is connected to the positive DC voltage output of the mains voltage rectifier GL via the winding N 1 of the transformer L2, the electrode E4 of the second fluorescent lamp FL2 and the resistor R2.
  • the low potential Terminals of the half-bridge capacitors C2, C3 are respectively connected to the negative DC voltage output of the mains voltage rectifier GL and the ground potential.
  • the terminal A1 of the resonance capacitor C1 is connected to the electrode E1 of the first fluorescent lamp FL1 and the electrode E3 of the second fluorescent lamp and connected via the resonance inductor L1 to the center tap M of the half-bridge inverter.
  • the other terminal of the resonant capacitor C1 is connected to the negative DC voltage output of the mains voltage rectifier GL and the ground potential.
  • the terminal A1 is connected via the electrode E1 and the resistor R3 to the positive DC voltage output of the mains voltage rectifier GL.
  • the heating device H shown only schematically in FIG.
  • the heating device H is inductively coupled to all the electrodes E1, E2, E3, E4 of the two fluorescent lamps FL1, FL2 and serves to heat the lamp electrodes before the gas discharge is ignited or else during the dimming operation of the lamps. Details of this heating device H are described, for example, in the published patent application EP 0 748 146 A1.
  • the resistors R0, R1, R2 and R3 serve to adjust the potentials at the taps A1, A2 and A3.
  • the corresponding electrical voltages can build up on the capacitors C1, C2 and C3 immediately after switching on the operating device and before igniting the gas discharge in the lamps FL1, FL2.
  • the control of the half-bridge transistors T1, T2 takes place with the aid of the programmatically operating microcontroller MC and the driver circuits TR for the transistors T1, T2.
  • the center tap M is alternately connected to the negative and the positive DC output of the mains voltage rectifier GL. Since the half-bridge capacitors C2, C3 are charged to half the supply voltage of the half-bridge inverter flows during lamp operation between the taps M and A2 and A3, a high-frequency alternating current whose frequency is determined by the switching clock of the transistors T1, T2.
  • the switching clock of the half-bridge transistors T1, T2 is changed such that the frequency of the alternating current in the load circuit is close to the resonance frequency of the series resonant circuit L1, C1.
  • a sufficiently high voltage is generated at the resonance capacitor C 1 in order to ignite the gas discharge in the fluorescent lamps FL1, FL2.
  • the series resonant circuit L1, C1 is attenuated by the parallel connection of the fluorescent lamps FL1, FL2.
  • the brightness control of the fluorescent lamps FL1, FL2 also takes place by changing the frequency of the alternating current in the load circuit and in the parallel connection of the fluorescent lamps FL1, FL2.
  • the lamps FL1, FL2 serve the resistor R14, the two rectifier diodes D3, D4 and the low-pass filter R15, C10. Due to the polarity of the two diodes D3, D4, a voltage which is proportional to the positive half-wave of the current 1 is measured at the resistor R14.
  • the low-pass filter R15, C10 connected downstream, a value U 1 of this voltage averaged over one or more half-waves is supplied to the terminal A 11 of the microcontroller MC for evaluation.
  • the time averaged voltage U 1 is therefore proportional to the time average I + of the positive half wave of the current I through the parallel connected lamps FL1, FL2.
  • the voltage U1 detected at the terminal A11 is also used to control the brightness of the two fluorescent lamps FL1, FL2.
  • the voltage divider R6, R7 is arranged with the capacitor C5 connected in parallel with the resistor R7.
  • the voltage U2 is measured, which is proportional to the supply voltage of the half-bridge inverter.
  • the voltage divider R8, R9 is arranged with the parallel to the resistor R9 connected capacitor C6.
  • the voltage U3 is measured, which is proportional to the voltage drop across the half-bridge capacitor C3.
  • the voltage divider R10, R11 is arranged with the capacitor C7 connected in parallel with the resistor R11.
  • the voltage U4 is measured, which is proportional to the voltage drop across the half-bridge capacitor C2.
  • the voltage applied to the terminals A6, A7, A8 and A11 voltages U1 to U4 are converted by analog-to-digital converters into digital values and evaluated by the microcontroller MC using a program implemented in the microcontroller to the driver circuit TR by an appropriate controller the half-bridge transistors T1, T2 to ensure a brightness control of the fluorescent lamps FL1, FL2 and a detection of the end of life of the lamps FL1, FL2.
  • the end of life of the lamps FL1, FL2 is detected by monitoring the occurrence of the rectifier effect in the fluorescent lamps FL1 FL2.
  • the DC voltage drop U dc1 across the electrical terminals of the fluorescent lamp FL1 is calculated from the difference of 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 of the half 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 ⁇ U2 ⁇ R 6+ R 7 R 7 - U3 ⁇ R 8+ R 9 R 9
  • the correction factor p has the value 1.11.
  • the values of the outputs P 1 or P 2 can be directly compared with the maximum permissible limit P max of 7.5 W for the lamp power at T5 listed in the "Test 2: Asymmetric Power Dissipation" of the supplement to the standard IEC 61347-2-3 Lamps are compared to monitor the end of life of the two fluorescent lamps FL1, FL2. This comparison is cyclically repeated by the microcontroller MC during lamp operation for both lamps FL1, FL2.
  • the second multiplication in the formulas (4a, 4b) is save, the correction factor p in the comparison value P max in the calculation, and this value is stored in the nonvolatile memory. During operation, this stored value is then compared cyclically with the product of I + and the amount of U dc1 and U dc2 , respectively.
  • the measured values for the variables U1, U2 and U3 or U4 are updated sequentially for both lamps FL1 and FL2 according to the above formulas for the powers P1 and P2 calculated and compared respectively with the maximum allowable power P max . If the power P1 or P2 is less than the maximum allowable power P max and the count of the counter variables Z 1 and Z2 for the lamp FL1 and FL2 is equal to zero, the current cycle for the lamp FL1 or FL2 is exited.
  • the counter Z1 or Z2 is decremented by the value 1. Thereafter, when the count is zero, the status bit S1 or S2 for reaching the end of life of the lamp FL1 or FL2 is deleted, otherwise the new count Z1 or Z2 is stored and leave the current cycle for the lamp FL1 or FL2 , If the power P1 or P2 but not smaller than the maximum allowable power P max , the counter Z1 or Z2 is increased by 1.
  • the status bit S1 or S2 is set, that is, the lamp FL1 or FL2 has reached its end of life. If the value of the counter Z1 or Z2 is not greater than the upper counter threshold ZSW, the new counter reading Z1 or Z2 is stored and then the current cycle for the lamp FL1 or FL2 is exited.
  • the value of the upper counter threshold ZSW can be specified.
  • the operating device is switched off.
  • the invention is not limited to the embodiment explained in more detail above.
  • the lamps FL1, FL2 may also be interrogated alternately instead of one after the other in the same cycle.
  • the counter readings Z1, Z2 be increased or decreased by a value greater than 1 in the event of a high overshoot or undershoot of the permissible limit value.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP04009750.3A 2003-06-25 2004-04-23 Procédé pour faire fonctionner au moins une lampe à décharge basse pression et appareil pour faire fonctionner au moins une lampe à décharge basse pression Expired - Lifetime EP1492393B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10328718 2003-06-25
DE10328718A DE10328718A1 (de) 2003-06-25 2003-06-25 Verfahren zum Betrieb mindestens einer Niederdruckentladungslampe und Betriebsgerät für mindestens eine Niederdruckentladungslampe

Publications (3)

Publication Number Publication Date
EP1492393A1 true EP1492393A1 (fr) 2004-12-29
EP1492393B1 EP1492393B1 (fr) 2012-08-22
EP1492393B8 EP1492393B8 (fr) 2013-04-17

Family

ID=33394988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04009750.3A Expired - Lifetime EP1492393B8 (fr) 2003-06-25 2004-04-23 Procédé pour faire fonctionner au moins une lampe à décharge basse pression et appareil pour faire fonctionner au moins une lampe à décharge basse pression

Country Status (5)

Country Link
US (1) US7064499B2 (fr)
EP (1) EP1492393B8 (fr)
JP (1) JP4437057B2 (fr)
CA (1) CA2465633A1 (fr)
DE (1) DE10328718A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007025953A1 (fr) * 2005-08-30 2007-03-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast electronique pour lampes a decharge comprenant un circuit de controle de fin de vie

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6972570B2 (en) * 2004-02-11 2005-12-06 Schriefer Jay R Quick-connect ballast testing and monitoring method and apparatus
KR101176086B1 (ko) * 2006-05-30 2012-08-22 페어차일드코리아반도체 주식회사 형광램프의 수명말기 검출회로
EP2030487A1 (fr) * 2006-05-31 2009-03-04 Koninklijke Philips Electronics N.V. Procédé et système pour faire fonctionner une lampe à décharge de gaz
CN102160467B (zh) * 2008-09-17 2014-01-22 奥斯兰姆有限公司 用于驱动放电灯的电路装置和方法
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
US8154211B2 (en) * 2009-10-13 2012-04-10 Panasonic Corporation End-of-life protection circuit and method for high intensity discharge lamp ballast
US8564216B1 (en) 2011-02-02 2013-10-22 Universal Lighting Technologies, Inc. Asymmetric end-of-life protection circuit for fluorescent lamp ballasts
DE102014005669B4 (de) * 2014-04-19 2017-10-26 Iie Gmbh & Co. Kg Vorrichtung und Verfahren zum Betreiben eines Lichterzeugers

Citations (2)

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Publication number Priority date Publication date Assignee Title
WO1999056506A1 (fr) 1998-04-29 1999-11-04 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour actionner au moins une lampe a decharge
US6232727B1 (en) 1998-10-07 2001-05-15 Micro Linear Corporation Controlling gas discharge lamp intensity with power regulation and end of life protection

Family Cites Families (5)

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US4117400A (en) * 1976-04-29 1978-09-26 Dynascan Corporation Circuit for testing transistors or the like
US5359274A (en) * 1992-08-20 1994-10-25 North American Philips Corporation Active offset for power factor controller
US5569984A (en) * 1994-12-28 1996-10-29 Philips Electronics North America Corporation Method and controller for detecting arc instabilities in gas discharge lamps
US5623187A (en) * 1994-12-28 1997-04-22 Philips Electronics North America Corporation Controller for a gas discharge lamp with variable inverter frequency and with lamp power and bus voltage control
GB2360150B (en) * 2000-03-10 2002-02-20 Microlights Ltd Improvements in and relating to high intensity discharge lighting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999056506A1 (fr) 1998-04-29 1999-11-04 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour actionner au moins une lampe a decharge
US6232727B1 (en) 1998-10-07 2001-05-15 Micro Linear Corporation Controlling gas discharge lamp intensity with power regulation and end of life protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007025953A1 (fr) * 2005-08-30 2007-03-08 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Ballast electronique pour lampes a decharge comprenant un circuit de controle de fin de vie
US7786679B2 (en) 2005-08-30 2010-08-31 Osram Gesellschaft Mit Beschraenkter Haftung Electronic ballast for discharge lamps having an EOL monitoring circuit

Also Published As

Publication number Publication date
JP4437057B2 (ja) 2010-03-24
DE10328718A1 (de) 2005-01-13
US20040263096A1 (en) 2004-12-30
JP2005019386A (ja) 2005-01-20
EP1492393B1 (fr) 2012-08-22
EP1492393B8 (fr) 2013-04-17
US7064499B2 (en) 2006-06-20
CA2465633A1 (fr) 2004-12-25

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