EP1372359A1 - Ansteuerschaltung für mindestens einen LED-Strang - Google Patents
Ansteuerschaltung für mindestens einen LED-Strang Download PDFInfo
- Publication number
- EP1372359A1 EP1372359A1 EP03011739A EP03011739A EP1372359A1 EP 1372359 A1 EP1372359 A1 EP 1372359A1 EP 03011739 A EP03011739 A EP 03011739A EP 03011739 A EP03011739 A EP 03011739A EP 1372359 A1 EP1372359 A1 EP 1372359A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- control circuit
- strand
- current flowing
- led strand
- 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
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
Definitions
- the present invention relates to a control circuit for at least one LED strand, whereby a switch is arranged in series with each LED strand and each LED strand has one Has supply connection, via which it can be connected to a supply voltage, wherein each switch can be controlled such that a current flow in the associated LED string is made possible with a first control circuit, which is designed to switch the minimum to control an LED string in such a way that an adjustable mean value of the LED strand flowing through current is achieved.
- FIG. 1 shows such a control circuit in which, for example, an LED string is formed by four LEDs D1 to D4.
- a switch T1 is arranged on one side of the LED string and is connected on the one hand to a control circuit and on the other hand to a supply voltage U V.
- the LED string is connected to ground via a shunt resistor R Sh .
- the voltage drop across the resistor R Sh Sh voltage U is applied to an integrator 10 which provides at its output a size corresponding to the mean value i LED corresponds to the current i LED flowing through the LED string.
- a comparator 12 provides at its output a control voltage U control ready to be supplied to a further comparator fourteenth Its second input is supplied with the triangular voltage U D provided by a triangular generator 16. Its output is connected to the control input of switch T1.
- i LED target can be the average i LEDs of the current through the LED string vary and thus change the brightness of the light emitted by LEDs D1 to D4, ie dim.
- This control circuit has several disadvantages: for example, when operating such an LED string in a motor vehicle, it must be expected that the supply voltage U V , for example the on-board voltage, is not constant.
- the coordination of the number of LEDs in the LED string must therefore be selected so that even with a minimal supply voltage U V, a sufficiently high current can be achieved through the LED string to ensure a certain minimum brightness of the LEDs. If the entire supply voltage is now always applied to the LED strand in order to achieve a high degree of efficiency, an increase in the supply voltage leads to an increase in the peak current flowing through the LED strand, see the thinly drawn curves in the middle illustration in FIG. 2.
- LEDs have a negative temperature coefficient of several millivolts per degree Celsius.
- FIG. 2 shows the peak current ⁇ LED at various temperatures as an example in thick lines.
- i LED is set, the peak current ⁇ LED varies considerably.
- the LED string is triggered in a pulsed manner, with the pauses between two successive pulses being larger at higher temperatures.
- the wavelength of the light emitted by the LEDs in turn changes undesirably.
- the switching element a series resistor upstream.
- the energy converted in the series resistor leads to an additional increase of the ambient temperature and thus reinforces the negative effect.
- the object of the present invention is therefore to provide a control circuit for the type mentioned at the outset in such a way that even when the supply voltage changes and the ambient temperature an operation of the LED string to deliver Guaranteed light in the desired brightness and color with high efficiency can be.
- the first-mentioned object is achieved by a control circuit with the features of Claim 1.
- the second object is achieved by a method with the Features of claim 14.
- the invention is based on the knowledge that the above objects can be achieved in an ideal manner if the peak value ⁇ LED of the current flowing through the LED strand is determined and the supply voltage provided to the LED strand is regulated in a corresponding manner.
- the mean i LED of the current flowing through the LED strand is regulated, the brightness of the light emitted by the LEDs is kept constant and adjustable.
- the color of the light emitted by the LED strand is kept adjustable and adjustable. If the supply voltage that is provided for the LED string is then designed so that as little energy as possible is converted into heat, a particularly high degree of efficiency can be achieved. This also enables LED strings to be implemented with any number of LEDs, ie when the peak current is specified, it does not matter whether the control circuit is used to operate an LED strand with 5 or 10 LEDs.
- the at least one LED strand is preferably operated in a clocked manner, the mean value of the current flowing through the at least one LED strand, in particular by pulse width modulation is set.
- the eye takes over the function of the integrator. As long as the LEDs are always operated with the same peak current, changes only the brightness of the light emitted by the LEDs, but not its color.
- the second control loop is preferred in view of a particularly high efficiency designed, the supply voltage of the string voltage of the at least one LED string adapt.
- the first and second control loops are designed Determine actual values for mean and peak value only for a first LED string wherein at least a second LED strand corresponds to that for the first LED strand determined actual values is operated.
- This measure can be made up of several LED arrays of existing LED arrays while achieving the advantages according to the invention control, but the two control loops are only executed once.
- the first control loop can have a first comparator with which the actual value of the Average value of the current flowing through the at least one LED strand with a specifiable one Setpoint value is compared, with the output signal of the first comparator on the input of a second comparator is coupled, the second input of which is connected to a Triangle signal is applied, the output signal of the second comparator to the at least one switch is coupled.
- the second control loop can have a third comparator with which the actual value of the Peak value of the current flowing through the at least one LED strand with a predeterminable one Setpoint value is compared, with the output signal of the third comparator on the first input of a fourth comparator is coupled, the second input of a triangular signal is applied, the output signal of the fourth comparator is coupled to a voltage converter.
- the average of the minimum a current flowing through an LED strand can be changed by an operator.
- the wavelength of the emitted by the LED strand Light the peak value of the current flowing through the at least one LED strand be designed to be changeable by an operator.
- the second control loop comprises a peak value detector for the current flowing through the at least one LED strand, a peak value can be predetermined for the current flowing through the at least one LED strand and the second control loop is designed to provide a supply voltage so that the predeterminable peak value is achieved. This results in an optimal adaptation of the supply voltage U V to the LED string voltage U St.
- the second control circuit preferably comprises a DC / DC converter, the output voltage of which is coupled to the at least one supply connection.
- the DC / DC converter is preferred in particular as a step-up converter, step-down converter or flyback converter.
- An inductance is preferably arranged in series with the output of the second control circuit.
- FIG. 3 shows a control circuit according to the invention, the circuit component in the right half of FIG. 3 essentially corresponding to the control circuit shown in FIG. 1.
- the drop across the resistor R Sh Sh voltage U is supplied to a peak detector 18 whose output signal is correlated with the actual peak value I LEDact and a comparator is supplied stirred 20th
- the adjustable peak value ⁇ LED setpoint is present at the other input of the comparator 20.
- One of the difference between ⁇ ⁇ LEDact LEDnom and corresponding voltage U Rule2 is supplied to a further comparator 22 whose other input is driven with a triangular voltage U D2.
- the output signal of the comparator 22 is present at the control input of a switch T2, which is connected to the supply voltage U V.
- a diode D is arranged in the reverse direction between the output of the switch T2 and ground.
- An inductance L is arranged in series between the output of the switch T2 and the supply voltage connection of the switch T1.
- the T1-side connection of inductance L is connected to ground via a capacitor C.
- the voltage U A provided by the capacitor C is preferably selected such that it is essentially equal to the phase voltage U St.
- a step-down converter is realized in the present case by the comparator 22, the switch T2 and the diode D and the triangular generator 21, which provides the voltage U D2 .
- the comparator 22 the switch T2 and the diode D and the triangular generator 21, which provides the voltage U D2 .
- other types of converters in particular DC / DC converters, can also be present at this point in the circuit, depending on the application.
- the oscillator frequency of the triangle generator 16 should preferably be chosen to be substantially lower than the oscillator frequency of the triangle generator 21.
- the integrator 10 can be differently outlined, that is, differently than by an RC element , be realized.
- the peak value detector 18 can be implemented differently than by a diode-capacitor combination.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
Abstract
Description
- Figur 1
- eine aus dem Stand der Technik bekannte Ansteuerschaltung für einen LED-Strang;
- Figur 2
- drei Diagramme zur Erläuterung der Abhängigkeit des den LED-Strang durchfließenden Spitzenstroms von der Umgebungstemperatur und der Versorgungsspannung; und
- Figur 3
- in schematischer Darstellungsweise den Aufbau einer erfindungsgemäßen Ansteuerschaltung.
Claims (14)
- Ansteuerschaltung für mindestens einen LED-Strang (Dl bis D4), wobei seriell zu jedem LED-Strang ein Schalter (T1) angeordnet ist und jeder LED-Strang einen Versorgungsanschluss aufweist, über den er mit einer Versorgungsspannung verbindbar ist, wobei jeder Schalter (T1) derart ansteuerbar ist, dass ein Stromfluss in dem zugehörigen LED-Strang ermöglicht wird, mit
einem ersten Regelkreis, der ausgelegt ist, den Schalter (T1) des mindestens einen LED-Strangs derart anzusteuern, dass ein einstellbarer Mittelwert (i LEDsoll) des den LED-Strang durchfließenden Stroms (i LED) erzielt wird,
dadurch gekennzeichnet, dass die Ansteuerschaltung weiterhin umfasst:
einen zweiten Regelkreis, der ausgelegt ist, dem mindestens einen LED-Strang (D1 bis D4) eine Versorgungsspannung (UA) bereitzustellen, in Abhängigkeit des Spitzenwerts (í LED) des den mindestens einen LED-Strang durchfließenden Stroms (i LED). - Ansteuerschaltung nach Anspruch 1,
dadurch gekennzeichnet, dass der zweite Regelkreis einen Spitzenwertdetektor (18) für den den mindestens einen LED-Strang durchfließenden Strom (i LED) umfasst, wobei ein Spitzenwert (í LEDsoll) für den den mindestens einen LED-Strang durchfließenden Strom vorgebbar ist und der zweite Regelkreis ausgelegt ist, eine Versorgungsspannung (UA) bereitzustellen, so dass der vorgebbare Spitzenwert (í LEDsoll) erzielt wird. - Ansteuerschaltung nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet dass der zweite Regelkreis einen DC/DC-Wandler (21, 22, T2, D) umfasst, dessen Ausgangsspannung (UA) an den mindestens einen Versorgungsanschluss gekoppelt ist. - Ansteuerschaltung nach Anspruch 3,
dadurch gekennzeichnet, dass der DC/DC-Wandler (22, T2, D) insbesondere als Aufwärtswandler, Abwärtswandler oder Sperrwandler ausgeführt ist. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass seriell zum Ausgang des zweiten Regelkreises eine Induktivität (L) angeordnet ist. - Ansteucrschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der mindestens eine LED-Strang getaktet betrieben wird. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Mittelwert (i LED) des den mindestens einen LED-Strang durchfließenden Stroms durch Pulsweitenmodulation eingestellt wird. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der zweite Regelkreis ausgelegt ist, die Versorgungsspannung (UA) der Strangspannung (USt) des mindestens einen LED-Strangs anzupassen. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der erste und der zweite Regelkreis ausgelegt sind, die Istwerte für Mittelwert (i LEDist) und Spitzenwert (í LEDist) nur für einen ersten LED-Strang zu bestimmen, wobei ein mindestens zweiter LED-Strang entsprechend der für den ersten LED-Strang ermittelten Istwerte (i LEDist, í LEDist) betrieben wird. - Anstcuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet dass der erste Regelkreis einen ersten Komparator (12) aufweist, mit dem der Istwert (i LEDist) des Mittelwerts des den mindestens einen LED-Strang durchfließenden Stroms (i LED) mit einem vorgebbaren Sollwert (i LEDsoll) verglichen wird, wobei das Ausgangssignal (URegel) des ersten Komparators (12) an den ersten Eingang eines zweiten Komparators (14) gekoppelt wird, dessen zweiter Eingang mit einem Dreiecksignal (UD) beaufsehlagt wird, wobei das Ausgangssignal des zweiten Komparators (14) an den mindestens einen Schalter (T1) gekoppelt wird. - Ansteuerschaltung nach einem der Ansprüche 3 bis 10,
dadurch gekennzeichnet, dass der zweite Regelkreis einen dritten Komparator (20) aufweist, mit dem der Istwert (í LEDist) des Spitzenwerts des den mindestens einen LED-Strang durchfließenden Stroms (i LED) mit einem vorgebbaren Sollwert (í LEDsoll) verglichen wird, wobei das Ausgangssignal des dritten Komparators (20) an den ersten Eingang eines vierten Komparators (22) gekoppelt wird, dessen zweiter Eingang mit einem Dreiecksignal (UD2) beaufschlagt wird, wobei das Ausgangssignal des vierten Komparators (22) an den DC/DC-Wandler gekoppelt wird. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Mittelwert (i LEDssoll) des den mindestens einen LED-Strang durchfließenden Stroms zum Zwecke des Dimmens von einer Bedienperson veränderbar ist. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Spitzcnwert (í LEDsoll) des den mindestens einen LED-Strang durchfließenden Stroms zum Zwecke der Einstellung der Wellenlänge des von dem LED-Strang abgegebenen Lichts von einer Bedienperson veränderbar ist. - Verfahren zum Betreiben mindestens eines LED-Strangs (D1 bis D4), wobei seriell zu jedem LED-Strang ein Schalter (T1) angeordnet ist und jeder LED-Strang einen Versorgungsanschluss (UV) aufweist, über den er mit einer Versorgungsspannung verbindbar ist, wobei jeder Schalter (T1) derart ansteuerbar ist, dass ein Stromfluss in dem zugehörigen LED-Strang ermöglicht wird, folgende Schritte umfassend:a) Ermitteln des Mittelwerts (
i LEDist) des den mindestens einen LED-Strang durchfließenden Stroms (i LED);b) Ansteuern des Schalters (T1) des mindestens einen LED-Strangs derart, dass ein einstellbarer Mittelwert (i LEDsoll) des den LED-Strangs durchfließenden Stroms (i LED) erzielt wird;
dadurch gekennzeichnet, dass es weiterhin folgende Schritte umfasst:c) Ermitteln des Spitzeriwerts (í LEDist) des den mindestens einen LED-Strang durchfließenden Stroms (i LED);d) Bereitstellen einer Versorgungsspannung (UA) an den mindestens einen LED-Strang in Abhängigkeit des Spitzenwerts (í LEDist) des den mindestens einen LED-Strang durchfließenden Stroms (i LED).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10225670 | 2002-06-10 | ||
DE10225670A DE10225670A1 (de) | 2002-06-10 | 2002-06-10 | Ansteuerschaltung für mindestens einen LED-Strang |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1372359A1 true EP1372359A1 (de) | 2003-12-17 |
EP1372359B1 EP1372359B1 (de) | 2007-02-21 |
Family
ID=29557718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03011739A Expired - Lifetime EP1372359B1 (de) | 2002-06-10 | 2003-05-23 | Ansteuerschaltung für mindestens einen LED-Strang |
Country Status (6)
Country | Link |
---|---|
US (1) | US7061394B2 (de) |
EP (1) | EP1372359B1 (de) |
CN (1) | CN100469208C (de) |
AT (1) | ATE354930T1 (de) |
CA (1) | CA2431514A1 (de) |
DE (2) | DE10225670A1 (de) |
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EP1871144A1 (de) * | 2006-06-22 | 2007-12-26 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | LED-Ansteuereinrichtung und entsprechendes Verfahren |
WO2014049216A1 (fr) * | 2012-09-28 | 2014-04-03 | Renault S.A.S. | Procédé d'élaboration d'une consigne de fonctionnement pour un ensemble de diodes d'éclairage d'un projecteur de véhicule, et véhicule correspondant |
EP2420107B1 (de) | 2009-04-14 | 2015-07-08 | Tridonic GmbH & Co KG | Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler |
WO2016173776A1 (de) * | 2015-04-30 | 2016-11-03 | Osram Gmbh | Schaltungsanordnung und verfahren zur verringerung der lichtmodulation von mindestens einer an einer spannung betriebenen lichtquelle |
AT519021B1 (de) * | 2009-04-14 | 2018-03-15 | Tridonic Gmbh & Co Kg | Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler |
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DE102004003698B4 (de) * | 2004-01-24 | 2005-11-24 | Preh Gmbh | Schaltungsanordnung zur Ansteuerung von Leuchtmitteln |
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US7492108B2 (en) * | 2005-08-11 | 2009-02-17 | Texas Instruments Incorporated | System and method for driving light-emitting diodes (LEDs) |
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WO2007041574A1 (en) | 2005-10-03 | 2007-04-12 | S. C. Johnson & Son, Inc. | Light apparatus |
TWI433588B (zh) | 2005-12-13 | 2014-04-01 | Koninkl Philips Electronics Nv | 發光二極體發光裝置 |
US7456586B2 (en) * | 2006-01-31 | 2008-11-25 | Jabil Circuit, Inc. | Voltage controlled light source and image presentation device using the same |
KR101303362B1 (ko) | 2006-01-31 | 2013-09-03 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | Led 드라이버 회로 |
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-
2002
- 2002-06-10 DE DE10225670A patent/DE10225670A1/de not_active Withdrawn
-
2003
- 2003-05-23 EP EP03011739A patent/EP1372359B1/de not_active Expired - Lifetime
- 2003-05-23 AT AT03011739T patent/ATE354930T1/de active
- 2003-05-23 DE DE50306558T patent/DE50306558D1/de not_active Expired - Lifetime
- 2003-06-09 CA CA002431514A patent/CA2431514A1/en not_active Abandoned
- 2003-06-10 US US10/457,486 patent/US7061394B2/en not_active Expired - Lifetime
- 2003-06-10 CN CNB031410243A patent/CN100469208C/zh not_active Expired - Lifetime
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DE19950135A1 (de) * | 1999-10-18 | 2001-04-19 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Ansteuerschaltung für LED und zugehöriges Betriebsverfahren |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1871144A1 (de) * | 2006-06-22 | 2007-12-26 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | LED-Ansteuereinrichtung und entsprechendes Verfahren |
WO2007147724A1 (en) * | 2006-06-22 | 2007-12-27 | Osram Gesellschaft mit beschränkter Haftung | A drive device for leds and related method |
US8143810B2 (en) | 2006-06-22 | 2012-03-27 | Osram Ag | Drive device for LEDs and related method |
EP2420107B1 (de) | 2009-04-14 | 2015-07-08 | Tridonic GmbH & Co KG | Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler |
AT519021B1 (de) * | 2009-04-14 | 2018-03-15 | Tridonic Gmbh & Co Kg | Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler |
AT519021A5 (de) * | 2009-04-14 | 2018-03-15 | Tridonic Gmbh & Co Kg | Leistungsregelung von led, mittels mittelwert des led-stroms und bidirektionaler zähler |
WO2014049216A1 (fr) * | 2012-09-28 | 2014-04-03 | Renault S.A.S. | Procédé d'élaboration d'une consigne de fonctionnement pour un ensemble de diodes d'éclairage d'un projecteur de véhicule, et véhicule correspondant |
FR2996404A1 (fr) * | 2012-09-28 | 2014-04-04 | Renault Sa | Procede d'elaboration d'une consigne de fonctionnement pour un ensemble de diodes d'eclairage d'un projecteur de vehicule, et vehicule correspondant |
WO2016173776A1 (de) * | 2015-04-30 | 2016-11-03 | Osram Gmbh | Schaltungsanordnung und verfahren zur verringerung der lichtmodulation von mindestens einer an einer spannung betriebenen lichtquelle |
Also Published As
Publication number | Publication date |
---|---|
ATE354930T1 (de) | 2007-03-15 |
EP1372359B1 (de) | 2007-02-21 |
US7061394B2 (en) | 2006-06-13 |
US20030227265A1 (en) | 2003-12-11 |
DE50306558D1 (de) | 2007-04-05 |
CA2431514A1 (en) | 2003-12-10 |
CN1469694A (zh) | 2004-01-21 |
CN100469208C (zh) | 2009-03-11 |
DE10225670A1 (de) | 2003-12-24 |
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