EP1233657A2 - Circuit de protection pour tube fluorescent - Google Patents

Circuit de protection pour tube fluorescent Download PDF

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Publication number
EP1233657A2
EP1233657A2 EP02001285A EP02001285A EP1233657A2 EP 1233657 A2 EP1233657 A2 EP 1233657A2 EP 02001285 A EP02001285 A EP 02001285A EP 02001285 A EP02001285 A EP 02001285A EP 1233657 A2 EP1233657 A2 EP 1233657A2
Authority
EP
European Patent Office
Prior art keywords
resistor
point
partial
voltage
protection circuit
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
EP02001285A
Other languages
German (de)
English (en)
Other versions
EP1233657A3 (fr
EP1233657B1 (fr
Inventor
Harald Schmitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1233657A2 publication Critical patent/EP1233657A2/fr
Publication of EP1233657A3 publication Critical patent/EP1233657A3/fr
Application granted granted Critical
Publication of EP1233657B1 publication Critical patent/EP1233657B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the present invention relates to a protective circuit for a fluorescent lamp with a first and a second lamp filament, comprising a DC voltage source with a plus and a minus pole, a half-bridge arrangement with a first and a second switch, the Half-bridge arrangement is fed by the DC voltage source and the first and the second switch to form a first reference point are connected to each other, the first reference point via a first Resistor is connected to the negative pole, a coupling-out capacitor, that in a serial connection between the half-bridge arrangement and the first or the second coil is arranged, the spiral connection of the decoupling capacitor a second reference point forms the via a second resistor with the negative pole is connected to a comparator which has a first and a second input and has an output, the first input with the first Reference point and the second input connected to the second reference point is, the output via a detection capacitor with the Minus pole is connected, and an evaluation circuit with which on the detection capacitor falling voltage can be evaluated in order to be exceeded a predetermined voltage level deactivation of
  • Such a protective circuit is known and is used, for example, by Applicant of the present invention in ballasts for fluorescent lamps built-in.
  • the protection circuit is at the end of life the fluorescent lamp, i.e. if the lamp is not yet defective, a criterion evaluate this in good time before overheating in the spiral area (Risk of melting of the socket) to switch off the half-bridge arrangement leads (also known as end-of-life shutdown).
  • a criterion evaluate this in good time before overheating in the spiral area (Risk of melting of the socket) to switch off the half-bridge arrangement leads also known as end-of-life shutdown.
  • the filaments of a fluorescent lamp with an emitter are covered to reduce the work function of the electrons.
  • the emitter is missing on one of the two lamp filaments the fluorescent lamp noticeable in that the work function slowly increases again and thus the output coupling capacitor falling voltage changes.
  • normal operation i.e.
  • the two reference points are on average at a potential equal to half the voltage from the DC voltage source is made available. At the end of life the second of the two reference points at a different potential and thus the reference points at different potential.
  • the potential difference is used to charge a detection capacitor, the Evaluation circuit is advantageously implemented so that a voltage level is adjustable, if it is exceeded, a deactivation of the half-bridge arrangement is effected.
  • ballasts in which one End-of-life detection and relamping are realized and there is one second category of ballasts where only the end-of-life detection is realized.
  • the Replacing a fluorescent lamp in a factory hall all lamps be turned off to reset the end-of-life detection to effect.
  • a new lamp can only be switched off after all the lamps have been switched off can be used instead of the decrepit lamp. Subsequently all lamps can be switched on again. Especially in large ones Such interruptions are undesirable in factories.
  • the object of the present invention is therefore an economical Realization of the end-of-life detection and the relamping function to make available.
  • the generic Protection circuit also has a third resistor, the Coupling capacitor bridges and a fourth resistor, the connects the first reference point to the positive pole of the DC voltage source, the first, second, third and fourth resistors chosen in this way are that the first and the second reference point without inserted Fluorescent lamp are at the same potential.
  • the invention is based on the idea of the end-of-life detection circuit to be interpreted or to implement the relamping function in such a way that as possible many components are shared. With a mass product like the present protective circuit, this allows almost no additional effort an inexpensive implementation of the additional relamping function realize what is in a very desirable price reduction results.
  • the idea here is to give the comparator an asymmetry detected, with the fluorescent lamp removed at its two entrances to supply identical potentials that reset the shutdown of the Effect half-bridge arrangement.
  • the two reference points are on average half the potential available from the DC voltage source set DC voltage. This is usually the so-called intermediate circuit voltage and is usually connected to an intermediate circuit capacitor provided.
  • the ratio of first resistance to fourth resistance is the same as large as the ratio of second resistance to third resistance.
  • the first resistance includes a first and a second partial resistor connected in series with one another and the second resistor a third and a fourth to each other Partial resistor connected in series, the first reference point with the Connection point of the first partial resistor and the fourth resistor and the second reference point with the connection point of the third resistor and the third partial resistor is connected and the first input of the comparator with the connection point between the first and second partial resistor is connected and the second input of the comparator with the connection point between the third and fourth Partial resistance is connected.
  • the ratio of the sum of the first and second partial resistances is preferred to the fourth resistance equal to the ratio of the sum of the third and fourth partial resistors chosen as the third resistor. In the event that the ratios are chosen to be one again, the both reference points when the fluorescent lamp is removed a potential half of that available from the DC voltage source set DC voltage corresponds.
  • the comparator comprises a first and a second switching element, each comprise a working, a control and a reference electrode, the fourth partial resistor a fifth and a sixth to each other in series switched partial resistance, the connection point between the first and the second partial resistance with the reference electrode of the first and connected to the control electrode of the second switching element is the connection point between the third partial resistor and the fifth partial resistor with the control electrode of the first switching element - is connected, the connection point between the fifth and the sixth Resistor connected to the reference electrode of the second switching element is, the working electrode of the first switching element and the working electrode of the second switching element with each other and via a series connection with a fifth resistor and the detection capacitor Mass are connected.
  • the ratio of the partial resistances three, five and six the potential difference required to start charging of the detection capacitor leads can be set. In this embodiment is the comparator in very simple and inexpensive Form realized.
  • the ratio of the fourth resistance to the sum is preferred the first and the second partial resistance equal to the ratio of the third resistance to the sum of the third, fifth and sixth partial resistance. Especially if the ratio is 1 the reference points again on a fluorescent lamp Potential that half provided by the DC voltage source DC voltage corresponds.
  • the evaluation circuit can comprise a holding element with a tripping potential and be designed such that as soon as the trigger potential point assumes predetermined potential, especially through a one-off Pulse, the holding element can be activated to the half-bridge circuit deactivate until a reset process by removing the fluorescent lamp is triggered. This measure ensures safe deactivation the half-bridge arrangement and thus for particularly high reliability the protection circuit according to the invention.
  • a first threshold value component in particular a zener diode, can be arranged with which the threshold can be set when it is exceeded deactivation of the half-bridge circuit is triggered. This measure enables activation of the holding member in the case of a predefinable one Detection capacitor voltage.
  • the ignition voltage limiting circuit can be a measuring element Have a measurement proportional to the ignition current, so that the Value of this size can be used to activate the holding member.
  • This Embodiment takes advantage of the fact that the ignition current is approximately proportional to the ignition voltage and is therefore used as a measure of the ignition voltage can be. Since the ignition current is easier to measure than the ignition voltage, This results in a simple construction of the circuit arrangement.
  • a second threshold component in particular a Zener diode arranged with which the threshold can be set is a deactivation of the half-bridge circuit when exceeded is triggered.
  • the measuring element can in particular be a resistor which is connected in series to one the half-bridge switch is arranged.
  • This embodiment is the Based on the knowledge that the ignition current also through the half-bridge arrangement is made available and therefore the half-bridge arrangement flowing current is proportional to the ignition current.
  • a resistor arranged in series with one of the half-bridge switches is particularly easy to proportional to the ignition current Determine size.
  • the embodiments according to the invention preferably further comprise suitable sieve circuits to at the reference and potential points Provide DC voltages for evaluation.
  • suitable sieve circuits to at the reference and potential points Provide DC voltages for evaluation.
  • the half-bridge arrangement makes that of the DC voltage source provided DC voltage into an AC voltage converted, which is reflected in the subsequent protection circuit.
  • suitable sieve circuits for example, using capacitors will be provided for further processing.
  • a capacitor C1 provides a voltage Uz which is used to supply the following circuit arrangement.
  • a half-bridge arrangement comprises a first switch S1 and a second switch S2. The controls of switches S1 and S2 are well known to the person skilled in the art and are therefore not shown in FIG. 1 for reasons of clarity.
  • the half-bridge arrangement feeds a fluorescent lamp L A with a first filament W1 and a second filament W2 via a coupling-out capacitor C2.
  • the fluorescent lamp L A is connected to an ignition circuit Zs, which is designed to cause the lamp L A to ignite
  • the center point of the half-bridge arrangement forms a first reference point A, which is connected to the lamp L A via a lamp inductor L D.
  • the helical connection of the coupling capacitor C2 forms a second reference point B.
  • the potentials of both reference points A, B are fed to a comparator V G , the output of which is connected to a detection capacitor C3.
  • the across the capacitor C3 C3 voltage U is fed to an evaluation circuit AS, which causes a deactivation of the half-bridge arrangement upon exceeding a predetermined voltage level.
  • the potentials of the reference points A and B shift due to the lack of emitter on one of the two spiral electrodes W1, W2 and the consequent increase in the work function of one of the two spiral electrodes W1, W2, even if the increase in the work function only is minimal.
  • the potential difference between the two reference points leads to the charging of the capacitor C3 and thus to the build-up of the voltage U C3 . If this exceeds a certain value, the half-bridge arrangement is switched off by the evaluation circuit As and thus prevents overheating in the spiral area.
  • the reference points A and B are on average at half the voltage U Z.
  • the decoupling capacitor C2 could also be arranged at another location, for example between the lamp inductor L D and the filament electrode W2.
  • the voltage on the coil electrode W1 would increase, which would lead to an increase in the voltage drop across the capacitor C2. This would increase the potential B compared to the potential A. If the emitter on the helix electrode W2 were consumed before the emitter on the helix electrode W1 was consumed, the potential at reference point A would drop compared to the potential at reference point B.
  • a relamping function is implemented by resetting the voltage on capacitor C3 by applying identical potential to the two inputs of the comparator.
  • the first reference point A is connected via a resistor R1, the second reference point B via a resistor R2 to the negative pole of the voltage U Z.
  • the positive pole of the voltage U Z is connected on the one hand to the reference point B via a resistor R3, which bridges the capacitor C2, and on the other hand via a resistor R4 to the reference point A.
  • Suitable dimensioning of the two voltage dividers R4, R1 and R3, R2 can achieve this that the potentials at the reference points A, B are identical when the lamp L A is removed and thus lead to a reset of the end-of-life detection.
  • the ratio of the resistor R1 to the resistor R4 and from the resistor R2 to the resistor R3 equal to 1, half the voltage of U Z is established at the two reference points A, B.
  • the resistors R1 and R2 are divided into two partial resistors R11, R12 and R21, R22. Appropriate dimensioning of the partial resistors can ensure that the majority of the voltages present at reference points A, B drop across the partial resistors R11 and R21. Accordingly, the comparator V G is only subjected to low voltages and can therefore be implemented with less voltage-resistant components.
  • FIGS. 3a / b an overall circuit for operating a fluorescent lamp is shown, which can be connected to a power supply via the terminals K1 and K2.
  • a fuse SI is arranged after the terminal K1, followed by a filter circuit comprising a capacitor C4 and an inductor L3 before the line signal is rectified in a line rectifier N GR .
  • the rectified output signal of the line rectifier N GR is buffered in the capacitor C1 and is used to supply the following circuit arrangement.
  • the resistor R22 of FIG. 2 is divided into two partial resistors R221 and R222.
  • a resistor R5 is connected in parallel with the capacitor C3, which enables the capacitor C3 to be discharged.
  • a capacitor C5 is connected in parallel with the resistor R12, while a capacitor C6 is connected in parallel with the series circuit comprising the resistors R221 and R222. These measures ensure that DC signals are present at the bases of two switching elements T1, T2 contained in the comparator.
  • the control electrode of the switching element T1 is connected to the connection point D between the resistor R21 and the resistor R221.
  • the reference electrode of the switching element T1 and the control electrode of the switching element T2 are connected to the connection point C of the resistors R11 and R12.
  • the reference electrode of the switching element T2 is connected to the connection point E between the resistors R221 and R222.
  • the working electrodes of both switching elements T1, T2 are connected via a resistor R6 to the connection point F, to which the capacitor C3 is connected. Since the voltage at reference point A is constant, a suitable choice of resistors R11 and R12 can be used to set a voltage of 15 V at connection point C, for example. By suitable dimensioning of the resistors R21, R221 and R222, during normal operation, ie the potential at point A is equal to the potential at point B, a voltage can be set which is 18 V at point D and 12 V at point E. In this state, the two switching elements T1, T2 are blocked.
  • the switching element T1 begins to conduct when the voltage at point D becomes less than the voltage at point C. As long as the voltage at point E is less than the voltage at point C. the switching element T2 locked. By conducting the switching element T1, the capacitor C3 is in turn charged via the resistor R6. With the magnitude of the voltage difference between the potential points C and D or C and E, the switching threshold and thus the degree of asymmetry at which the switch-off takes place can also be set.
  • the voltage at point F which corresponds to the state of charge of capacitor C3, is transmitted via a diode D1 and a Zener diode Z1 to a triggering potential point G in a holding element HG.
  • the holding element HG is supplied via the charge stored in a capacitor C7 of a starting circuit ST.
  • the switching element T4 switches through.
  • the switching element T3 switches through and thus supplies the holding current for a holding element that is self-holding in this way.
  • the resistor R8 in combination with the capacitor C8 and the resistor R9 in combination with the capacitor C9 ensure that faults are eliminated, thereby preventing the holding element from being activated accidentally. Because the switching element T4 conducts, the potential at point I drops to 0 V.
  • the two switches S1 and S2 of the half-bridge circuit have respective control circuits A S1 , A S2 .
  • Each drive circuit A S1 , A S2 comprises an inductance L1, L2, which is coupled to the lamp inductor L D. As soon as the potential at point I drops to 0 V, the diode D2 begins to conduct and thus grounds the signal fed into the control circuit A S2 via the inductance L2, so that the switch S2 is no longer activated. This also leads to the switch S1 being switched off.
  • An ignition voltage limiting circuit Z SB is also connected to the point G of the holding element H G. It comprises a measuring resistor R10, which is arranged in series with the switch S2. The potential at point J, ie the voltage drop across resistor R10, is proportional to the ignition current and thus proportional to the ignition voltage.
  • the ignition voltage limiting voltage Z SB has the task of preventing the ignition circuit Z S from being destroyed, for example in the case of air pullers.
  • the ignition circuit Z S comprises two capacitors C10 and C11 and a PTC thermistor PTC1.
  • the resistor R14 serves to cause a time delay in the response behavior of the ignition voltage limiting circuit.
  • the level can be set via the diodes D3 and Z2 at which an ignition voltage limitation is carried out by acting on the point G of the holding element H G and thus switching off the half-bridge arrangement.
  • the voltage across resistor R10 is screened by resistor R9 and capacitor C9.
  • the level of the critical ignition voltage can also be influenced by the value of the resistor R10.
  • the diode D3 also protects the holding element H G from negative voltage peaks.
  • the components of the ignition circuit Z S and the lamp inductor L D can be made smaller by the ignition voltage limiting circuit Z SB .

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP02001285A 2001-02-20 2002-01-17 Circuit de protection pour tube fluorescent Expired - Lifetime EP1233657B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10108138A DE10108138A1 (de) 2001-02-20 2001-02-20 Schutzschaltung für eine Leuchstofflampe
DE10108138 2001-02-20

Publications (3)

Publication Number Publication Date
EP1233657A2 true EP1233657A2 (fr) 2002-08-21
EP1233657A3 EP1233657A3 (fr) 2006-05-24
EP1233657B1 EP1233657B1 (fr) 2007-07-25

Family

ID=7674857

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02001285A Expired - Lifetime EP1233657B1 (fr) 2001-02-20 2002-01-17 Circuit de protection pour tube fluorescent

Country Status (7)

Country Link
US (1) US6650514B2 (fr)
EP (1) EP1233657B1 (fr)
CN (1) CN100477880C (fr)
AT (1) ATE368367T1 (fr)
CA (1) CA2373571A1 (fr)
DE (2) DE10108138A1 (fr)
TW (1) TW540255B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008119376A1 (fr) * 2007-03-29 2008-10-09 Osram Gesellschaft mit beschränkter Haftung Montage de commande d'au moins une lampe fluorescente
WO2008128565A1 (fr) * 2007-04-19 2008-10-30 Osram Gesellschaft mit beschränkter Haftung Circuit d'excitation pour lampe fluorescente, procédé de fonctionnement dudit circuit et système comprenant ledit circuit
EP1343360A3 (fr) * 2002-03-05 2011-03-09 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour alimenter une lampe à décharge muni d'une détection de fin de durée de vie

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US6979959B2 (en) 2002-12-13 2005-12-27 Microsemi Corporation Apparatus and method for striking a fluorescent lamp
US7405522B2 (en) * 2003-08-26 2008-07-29 Q Technology, Inc. Multiple failure detection shutdown protection circuit for an electronic ballast
US7598677B2 (en) * 2003-08-26 2009-10-06 Q Technology, Inc. Multiple failure detection shutdown protection circuit for an electronic ballast
US7187139B2 (en) 2003-09-09 2007-03-06 Microsemi Corporation Split phase inverters for CCFL backlight system
US7183727B2 (en) 2003-09-23 2007-02-27 Microsemi Corporation Optical and temperature feedbacks to control display brightness
US7468722B2 (en) 2004-02-09 2008-12-23 Microsemi Corporation Method and apparatus to control display brightness with ambient light correction
US7112929B2 (en) 2004-04-01 2006-09-26 Microsemi Corporation Full-bridge and half-bridge compatible driver timing schedule for direct drive backlight system
US7755595B2 (en) 2004-06-07 2010-07-13 Microsemi Corporation Dual-slope brightness control for transflective displays
DE102005013898A1 (de) * 2005-03-24 2006-09-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung zum Betrieb mindestens einer ersten und einer zweiten darin einsetzbaren Lampe
DE102005028419A1 (de) * 2005-06-20 2006-12-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Abschaltschaltung
US7414371B1 (en) 2005-11-21 2008-08-19 Microsemi Corporation Voltage regulation loop with variable gain control for inverter circuit
US7569998B2 (en) 2006-07-06 2009-08-04 Microsemi Corporation Striking and open lamp regulation for CCFL controller
DE102006036293A1 (de) * 2006-08-03 2008-02-14 Cooper Crouse-Hinds Gmbh Überwachungsvorrichtung
US8093839B2 (en) 2008-11-20 2012-01-10 Microsemi Corporation Method and apparatus for driving CCFL at low burst duty cycle rates
US8487541B2 (en) * 2010-10-11 2013-07-16 General Electric Company Method to ensure ballast starting regardless of half cycle input
US8810146B1 (en) 2011-11-04 2014-08-19 Universal Lighting Technologies, Inc. Lighting device with circuit and method for detecting power converter activity
DE102012207002A1 (de) * 2011-12-23 2013-06-27 Tridonic Gmbh & Co. Kg Verfahren, Betriebsgerät und Beleuchtungssystem
CN103369770B (zh) * 2012-03-31 2016-09-07 海洋王照明科技股份有限公司 灯具过温保护电路及装置

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US5783911A (en) * 1995-07-12 1998-07-21 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Circuit arrangement for operating electric lamps, and operating method for electric lamps
JPH0935512A (ja) 1995-07-25 1997-02-07 Matsushita Electric Works Ltd 無電極放電灯点灯装置
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US5808422A (en) * 1996-05-10 1998-09-15 Philips Electronics North America Lamp ballast with lamp rectification detection circuitry
US5770925A (en) * 1997-05-30 1998-06-23 Motorola Inc. Electronic ballast with inverter protection and relamping circuits
FI102347B1 (fi) * 1997-06-18 1998-11-13 Helvar Oy Lampun tasasuuntauksen tunnistuspiirillä varustettu elektroninen liitäntälaite
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1343360A3 (fr) * 2002-03-05 2011-03-09 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit pour alimenter une lampe à décharge muni d'une détection de fin de durée de vie
WO2008119376A1 (fr) * 2007-03-29 2008-10-09 Osram Gesellschaft mit beschränkter Haftung Montage de commande d'au moins une lampe fluorescente
WO2008128565A1 (fr) * 2007-04-19 2008-10-30 Osram Gesellschaft mit beschränkter Haftung Circuit d'excitation pour lampe fluorescente, procédé de fonctionnement dudit circuit et système comprenant ledit circuit

Also Published As

Publication number Publication date
CA2373571A1 (fr) 2002-08-20
TW540255B (en) 2003-07-01
EP1233657A3 (fr) 2006-05-24
CN100477880C (zh) 2009-04-08
DE50210534D1 (de) 2007-09-06
US20020114114A1 (en) 2002-08-22
DE10108138A1 (de) 2002-08-29
US6650514B2 (en) 2003-11-18
ATE368367T1 (de) 2007-08-15
EP1233657B1 (fr) 2007-07-25
CN1374824A (zh) 2002-10-16

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