EP1185147B1 - Spannungsversorgung von LED's für Beleuchtungszwecke - Google Patents
Spannungsversorgung von LED's für Beleuchtungszwecke Download PDFInfo
- Publication number
- EP1185147B1 EP1185147B1 EP01106716A EP01106716A EP1185147B1 EP 1185147 B1 EP1185147 B1 EP 1185147B1 EP 01106716 A EP01106716 A EP 01106716A EP 01106716 A EP01106716 A EP 01106716A EP 1185147 B1 EP1185147 B1 EP 1185147B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transistor
- voltage
- light emitting
- emitting diode
- constant current
- 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.)
- Expired - Lifetime
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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]
- H05B45/20—Controlling the colour of the light
-
- 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
Definitions
- the present invention relates to a control circuit for at least one Light-emitting diode or for a light-emitting diode arrangement, on a light-emitting diode arrangement and a method for supplying a constant current source with a Supply voltage.
- the invention relates generally to the field of light emitting diodes (LEDs) and more specifically - in the field of the use of such LEDs Illumination purposes.
- LEDs light emitting diodes
- Yield light output per watt
- the blue LEDs necessary for the generation of white light have recently achieved a satisfactory level of efficiency.
- FIG. 4 shows a control circuit as it is present in products manufactured by the company Color Kinetics are sold and essentially the US patent mentioned correspond.
- the LED LED is controlled with a constant current source KSQ.
- the Constant current source has a bipolar transistor, with the light emitting diode LED the collector of an NPN transistor is connected.
- the emitter of transistor Q1 Constant current source KSQ is grounded by means of an ohmic resistor R2 connected and via the PWM circuit for regulating the current to the control connection of transistor Q1 fed back.
- the NPN transistor provides a switchable Current drain (also known as current sink or in English "current sink”).
- the diode current is detected by means of the ohmic resistor R2 and by means of Change in base voltage regulated to a setpoint.
- the transistor Q1 can only keep the output current constant as long as it is not oversaturated, ie as long as the voltage U CE between its collector and its emitter is greater than the saturation voltage U CESAT .
- the saturation voltage is usually between about 0.7 and 1.2 volts.
- the supply voltage U CC is therefore applied, which is clearly above the sum of the flux voltage at the light-emitting diode LED and the saturation voltage U CESAT .
- a safety margin is thus created in order to be able to reliably compensate for production-related or thermal tolerances or fluctuations in the flow voltage of the diode.
- a sufficiently large safety margin is thus added to the usual saturation voltage U CESAT .
- a control circuit of the type described above is also from, for example GB 2 333 593 known.
- US Pat. No. 5,929,617 describes a so-called LDO (low dropout) regulator for delivering a regulated voltage to a load, the Falling voltage is monitored via the transistor of the circuit arrangement. If this voltage falls below a certain minimum value, the current supplied to the load is reduced to cause the transistor to transition to prevent non-adjustable range.
- LDO low dropout
- a control circuit is therefore provided for at least one light-emitting diode or light-emitting diode arrangement.
- the drive circuit has a constant current source, to which a supply voltage is applied and which has a transistor with a control connection and two output-side connections, the light-emitting diode or light-emitting diode arrangement being connected in series with one of the output-side connections of the transistor.
- a control loop is provided which, in the event that a bipolar transistor is used, detects the collector-emitter voltage and / or the collector base voltage of the transistor. If, however, an FET transistor is used, the voltage drop between the two output-side connections of the transistor is detected.
- the supply voltage of the constant current source is then set in such a way that the voltage drop U CE between the two output-side connections of the transistor corresponds to a desired value which is above the saturation voltage U CESAT of the transistor.
- the control loop can be a function for signal processing of the detected Have voltage drop.
- a light-emitting diode arrangement which has at least two groups of light-emitting diodes of different colors, wherein again each group has at least one light emitting diode.
- each group of light emitting diodes has a control circuit as described above intended.
- a method for regulating the supply voltage of a constant current source for at least one light-emitting diode has a transistor with a control connection and two output-side connections and the light-emitting diode is connected in series with one of the output-side connections of the transistor.
- the method has the step of detecting the collector-emitter voltage and / or the collector base voltage of the transistor. If, however, an FET transistor is used, the voltage drop between the two output-side connections of the transistor is detected.
- the supply voltage of the constant current source is set in such a way that the voltage drop between the two output-side connections of the transistor corresponds to a desired value which is above the saturation voltage U CESAT of the transistor.
- the detected voltage drop can be processed as a signal in the feedback loop.
- the transistor Constant current source is an npn bipolar transistor connected as a current sink.
- this can be done using a pnp transistor as a switchable current source be replaced.
- both cases are also in FET technology, e.g. with IGBTs, realizable.
- FIG. 1 shows a schematic view of a control circuit for an LED array 5, that several groups 10, 11, 12 each consisting of several red, green or has blue LEDs.
- entire LED array 5 supplied with constant current sources 2.
- Constant current sources 2 is a common feedback or control loop 6 provided that - as will be explained later - as the actual value Voltage drop at the output terminals of the transistor is detected and closed a power section 1 with regulated (adjustable) DC output voltage.
- the power unit 1 supplies the constant current sources 2 with a regulated DC supply voltage.
- a sequence controller (controller) 9 is provided, which Target current by changing the voltage signals at the control connections of the Can set transistors of constant current sources 2.
- the structure of the constant current source 2 is shown in detail in FIG.
- essential Component of constant current source 2 is a transistor, here an npn bipolar transistor 3, the collector side with the light-emitting diode or a light-emitting diode arrangement 5 is connected and its emitter is connected to a measuring resistor (ohmic resistor) 4 connected is. Since the current through the measuring resistor 4 essentially the current through the LED 5 (the base current can be neglected), is the Diode current and can therefore be used to regulate the diode current by changing the Voltage at the control terminal (base) of transistor 3 can be used.
- the voltage difference between the collector and the emitter of the transistor 3 U CE must be greater than the saturation voltage U CESAT of the transistor 3 if this is to be able to withstand the current through the light-emitting diode even with a slightly fluctuating supply voltage U CC to keep constant.
- the voltage drop of the light-emitting diode 5 forward voltage
- the supply voltage U CC in the prior art would correspond exactly to the sum of the forward voltage of the light-emitting diodes 5 and the saturation voltage U CESAT of the transistor 3, there is the problem that the collector-emitter voltage U CE to the transistor 3 is below the saturation voltage U CESAT of the transistor 3 can drop if the forward voltage 5 of the LED is unexpectedly large due to its tolerance, for example, or rises over time. In this case of saturation, the transistor Q1 could no longer keep the diode current constant.
- the collector-emitter voltage and / or the collector base voltage as the actual value of the control loop 6 detected. It should be noted that the collector-emitter voltage differs from the collector base voltage only by the relatively constant amount (e.g. 0.6 volts) of the base-emitter voltage, since the base-emitter path is diode-like Has properties.
- the detected voltage signal is processed as an actual variable and fed to a comparator 8, to which the setpoint for the collector-emitter voltage and / or collector base voltage is also fed at an input 7.
- the comparator 8 then sends a control signal to the power unit 1, which has an AC / DC converter with a regulated output.
- the supply voltage U CC is changed in such a way that the detected actual value corresponds to the target value.
- the setpoint U CE is selected somewhat above the saturation voltage U CESAT (generally between about 0.7 and 1.2 volts) transistor.
- the target value for the collector base voltage U CB is the value of the collector-emitter voltage U CE minus the voltage that drops across the base-emitter path of the transistor 3.
- the voltage drop across the transistor 3 can be selected just above the saturation voltage U CESAT of the transistor 3, so that the power loss and the heat development associated with the transistor 3 is reduced can be.
- Figure 3 shows a modification of the principle of Figure 1 in that for each Group 10, 11, 12 of the red, blue and green light-emitting diodes of the LED array 5 one Constant current source 2 is provided, each of which has a feedback loop 6 for itself and has a power unit 1 for the supply voltage.
- the other Groups of light-emitting diodes of the LED array 5 are provided by their own constant current sources 2 'supplied, which have their own control loop and their own power section.
- sequence control 9 for everyone Constant current sources provided by appropriate lighting control of the various groups 10, 11, 12 of the light-emitting diodes of the LED array 5 various lighting effects, such as color transitions and the like can achieve.
- the Sequence control 9 can be controlled, for example, by a bus.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
- Luminescent Compositions (AREA)
Description
- Fig. 1
- zeigt eine schematische Ansicht einer Ansteuerschaltung für LED's (genauer gesagt LED-Arrays), bei der die Konstant-Versorgungsspannung der Konstantstromquelle geregelt wird.
- Fig. 2
- zeigt eine detaillierte Ansicht der Schaltung von Figur 1,
- Fig. 3
- zeigt die Anwendung jeweils einer Konstantstromquelle, Versorgungsspannung und Regelschleife für je eine Gruppe an farbigen Leuchtdioden in einem LED-Array, und
- Fig. 4
- zeigt eine bekannte Ansteuerschaltung für Leuchtdioden für Beleuchtungszwecke.
Claims (7)
- Ansteuerschaltung für wenigstens eine Leuchtdiode bzw. Leuchtdioden-Anordnung,
mit einer Konstantstromquelle (2), an die eine Versorgungsspannung (1) angelegt ist und die einen Bipolartransistor (3) mit einem Steueranschluss und zwei ausgangsseitigen Anschlüssen aufweist, wobei die Leuchtdiode (5) bzw. Leuchtdioden-Anordnung in Serie zu einem der ausgangsseitigen Anschlüsse des Transistors (3) geschaltet ist,
gekennzeichnet durch
eine Rückführ- bzw. Regelschleife (6) mit Mitteln zurErfassung der Kollektor-Emitterspannung (UCE) und/oder der Kollektor-Basisspannung (UCB) des Transistors (3), undEinstellung der Versorgungsspannung (1) der Konstantstromquelle (2) derart, dass der Spannungsabfall zwischen den beiden ausgangsseitigen Anschlüssen des Transistors (3) einem Sollwert entspricht, der oberhalb der Sättigungsspannung des Transistors (3) liegt. - Ansteuerschaltung für wenigstens eine Leuchtdiode bzw. Leuchtdioden-Anordnung,
mit einer Konstantstromquelle (2), an die eine Versorgungsspannung (1) angelegt ist und die einen FET-Transistor (3) mit einem Steueranschluss und zwei ausgangsseitigen Anschlüssen aufweist, wobei die Leuchtdiode (5) bzw. Leuchtdioden-Anordnung in Serie zu einem der ausgangsseitigen Anschlüsse des Transistors (3) geschaltet ist,
gekennzeichnet durch
eine Rückführ- bzw. Regelschleife (6) mit Mitteln zurErfassung des Spannungsabfalls zwischen den beiden ausgangsseitigen Anschlüssen des Transistors (3), undEinstellung der Versorgungsspannung (1) der Konstantstromquelle (2) derart, dass der Spannungsabfall zwischen den beiden ausgangsseitigen Anschlüssen des Transistors (3) einem Sollwert entspricht, der oberhalb der Sättigungsspannung des Transistors (3) liegt. - Ansteuerschaltung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß die Rückführ- bzw. Regelschleife (6) zur Signalaufbereitung des erfassten Spannungsabfalls (UCE, UCB) ausgebildet ist. - Leuchtdioden-Anordnung,
aufweisend wenigstens zwei Gruppen an Leuchtdioden (10, 11, 12) unterschiedlicher Farbe, wobei jede Gruppe wenigstens eine Leuchtdiode aufweist,
dadurch gekennzeichnet, dass für eine jede Gruppe an Leuchtdioden eine Ansteuerschaltung nach einem der vorhergehenden Ansprüche vorgesehen ist. - Verfahren zur Spannungsversorgung einer Konstantstromquelle für wenigstens eine Leuchtdiode,
wobei die Konstantstromquelle (2) einen Bipolartransistor (3) mit einem Steueranschluss und zwei ausgangsseitigen Anschlüssen aufweist und die Leuchtdiode (5) in Serie zu einem der ausgangsseitigen Anschlüsse des Transistors (3) geschaltet ist,
aufweisend die folgenden Schritte:Erfassung der Kollektor-Emitterspannung (UCE) und/oder der Kollektor-Basisspannung (UCB) des Transistors (3), undEinstellung der Versorgungsspannung (1) der Konstantstromquelle (2) derart, dass der Spannungsabfall zwischen den beiden ausgangsseitigen Anschlüssen des Transistors (3) einem Sollwert entspricht, der oberhalb der Sättigungsspannung des Transistors (3) liegt. - Verfahren zur Spannungsversorgung einer Konstantstromquelle für wenigstens eine Leuchtdiode,
wobei die Konstantstromquelle (2) einen FET-Transistor (3) mit einem Steueranschluss und zwei ausgangsseitigen Anschlüssen aufweist und die Leuchtdiode (5) in Serie zu einem der ausgangsseitigen Anschlüsse des Transistors (3) geschaltet ist, aufweisend die folgenden Schritte:Erfassung des Spannungsabfalls zwischen den beiden ausgangsseitigen Anschlüssen des Transistors (3), undEinstellung der Versorgungsspannung (1) der Konstantstromquelle (2) derart, dass der Spannungsabfall zwischen den beiden ausgangsseitigen Anschlüssen des Transistors (3) einem Sollwert entspricht, der oberhalb der Sättigungsspannung des Transistors (3) liegt. - Verfahren nach Anspruch 5 oder 6,
dadurch gekennzeichnet, daß der erfasste Spannungsabfall (UCE, UCB) in einer Rückführ- bzw. Regelschleife (6) signalaufbereitet wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10013216A DE10013216A1 (de) | 2000-03-17 | 2000-03-17 | Spannungsversorgung von LED's für Beleuchtungszwecke |
DE10013216 | 2000-03-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1185147A1 EP1185147A1 (de) | 2002-03-06 |
EP1185147B1 true EP1185147B1 (de) | 2003-12-17 |
Family
ID=7635242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01106716A Expired - Lifetime EP1185147B1 (de) | 2000-03-17 | 2001-03-16 | Spannungsversorgung von LED's für Beleuchtungszwecke |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1185147B1 (de) |
AT (1) | ATE256962T1 (de) |
DE (2) | DE10013216A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7852016B2 (en) | 2006-03-15 | 2010-12-14 | Samsung Electronics Co., Ltd. | Light emitting apparatus and control method therefor |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4177022B2 (ja) * | 2002-05-07 | 2008-11-05 | ローム株式会社 | 発光素子駆動装置、及び発光素子を備えた電子機器 |
US6690146B2 (en) * | 2002-06-20 | 2004-02-10 | Fairchild Semiconductor Corporation | High efficiency LED driver |
DE102004050655A1 (de) | 2004-10-18 | 2006-06-01 | Volkswagen Ag | Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung |
DE102005012663B4 (de) | 2005-03-18 | 2018-08-23 | Austriamicrosystems Ag | Anordnung mit einem Spannungskonverter zur Spannungsversorgung einer elektrischen Last und Verfahren zum Einstellen der Anordnung mit Spannungskonverter |
JP2009522635A (ja) * | 2005-12-29 | 2009-06-11 | ギブン イメージング リミテッド | Led制御回路及び方法 |
DE102006000810B4 (de) * | 2006-01-03 | 2007-10-04 | Vossloh-Schwabe Optoelectronic Gmbh & Co. Kg | Verschaltete Anordnung von wenigstens einen Leuchtdiodenchip aufweisenden Einzelmodulen |
KR100737867B1 (ko) * | 2006-06-02 | 2007-07-12 | 삼성전자주식회사 | 발광장치 및 발광장치의 제어방법 |
US8319449B2 (en) | 2006-12-06 | 2012-11-27 | Nxp B.V. | Controlled voltage source for LED drivers |
EP2197244B1 (de) * | 2008-12-12 | 2011-08-03 | austriamicrosystems AG | Stromquelle und Stromquellenanordnung |
ATE554435T1 (de) | 2009-02-12 | 2012-05-15 | Austriamicrosystems Ag | Kreislaufladepumpenanordnung und verfahren zur bereitstellung eines geregelten stroms |
DE102014202363A1 (de) | 2014-02-10 | 2015-08-13 | Tridonic Gmbh & Co Kg | Spannungskonverter für den Betrieb von Leuchtmitteln |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63305837A (ja) * | 1987-06-05 | 1988-12-13 | Katsuyuki Miyasaka | 電子機器 |
JP2706740B2 (ja) * | 1990-05-16 | 1998-01-28 | セイコーインスツルメンツ株式会社 | ボルテージレギュレータ |
JPH11214183A (ja) * | 1998-01-22 | 1999-08-06 | Hochiki Corp | 発光回路 |
US5929617A (en) * | 1998-03-03 | 1999-07-27 | Analog Devices, Inc. | LDO regulator dropout drive reduction circuit and method |
DE19814745A1 (de) * | 1998-04-02 | 1999-10-07 | Apag Elektronik Ag | Schaltung für eine LED-Leuchte |
-
2000
- 2000-03-17 DE DE10013216A patent/DE10013216A1/de not_active Withdrawn
-
2001
- 2001-03-16 DE DE50101176T patent/DE50101176D1/de not_active Expired - Lifetime
- 2001-03-16 AT AT01106716T patent/ATE256962T1/de active
- 2001-03-16 EP EP01106716A patent/EP1185147B1/de not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7852016B2 (en) | 2006-03-15 | 2010-12-14 | Samsung Electronics Co., Ltd. | Light emitting apparatus and control method therefor |
Also Published As
Publication number | Publication date |
---|---|
EP1185147A1 (de) | 2002-03-06 |
DE10013216A1 (de) | 2001-09-20 |
ATE256962T1 (de) | 2004-01-15 |
DE50101176D1 (de) | 2004-01-29 |
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