WO2016156030A1 - Ensemble circuit permettant de faire fonctionner au moins une première et une seule seconde cascade de del - Google Patents

Ensemble circuit permettant de faire fonctionner au moins une première et une seule seconde cascade de del Download PDF

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Publication number
WO2016156030A1
WO2016156030A1 PCT/EP2016/055555 EP2016055555W WO2016156030A1 WO 2016156030 A1 WO2016156030 A1 WO 2016156030A1 EP 2016055555 W EP2016055555 W EP 2016055555W WO 2016156030 A1 WO2016156030 A1 WO 2016156030A1
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WO
WIPO (PCT)
Prior art keywords
leds
coupled
cascade
circuit arrangement
current
Prior art date
Application number
PCT/EP2016/055555
Other languages
German (de)
English (en)
Inventor
Meik Weckbecker
Original Assignee
Osram Gmbh
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 Osram Gmbh filed Critical Osram Gmbh
Publication of WO2016156030A1 publication Critical patent/WO2016156030A1/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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • Circuit arrangement for operating at least a first and exactly a second cascade of LEDs
  • the present invention relates to a circuit arrangement for operating at least a first and exactly a second cascade of LEDs.
  • it addresses the problem of adjusting the brightness of multichannel LED modules controlled by the combination of linear dimming and PWM (pulse width modulation) dimming.
  • the dimming is achieved by a combination of PWM and lowering the amplitude of the current through the respective LED cascade.
  • the LEDs of the respective LED cascade work in a dimmed state in one
  • Pulse width modulation can be controlled. In addition to the mentioned increase in efficiency will continue to be a
  • EP 1 689 212 B1 is a
  • the method comprises the connection operations over at least a portion of the dimming range: energizing the light source with a current whose intensity is switched between an on value and an off with a given duty cycle Value, and setting at least one of the on and off values to a portion of the rated current value.
  • a dimming range between 0% and L% dimmed over an uncontacted constant current ie by choosing a lower current amplitude.
  • L% and H% is a mixed form selected from amplitude-reduced constant current and PWM, while in a range between H% to 100% is dimmed only by PWM, the current amplitude on
  • illustrated embodiment is dimmed in a range of Dimmlevels between 0% and H% by adjusting the amplitude of the current and a PWM with a constant low on-time. In a range between H% and 100% of the
  • Dimmlevels is the current at rated current level, the on-time increases up to 100%.
  • Display device is reduced, wherein the amount of the current flow through the LEDs only up to a
  • predetermined lower limit value is reduced, and wherein for further reducing the brightness of the flow stream is clocked, wherein the amount of the flow stream during the clocking is equal to or greater than the lower limit value.
  • Variation of the brightness in a dimming process with a variation of the color locus goes along. This is undesirable if a desired color location, for example for the provision of predetermined lighting conditions, is to be maintained. In addition, there is an undesirable influence of the temperature on the color point, which even increases with the dimming.
  • the object of the present invention is to further develop the known methods such that a
  • the present invention is based on the finding that this task can be optimally solved if the two subtasks, i. Dimming the current on the one hand and keeping constant the color location on the other hand, from each other
  • the second cascade of LEDs serves as a bypass strand, in other words as an overflow valve for the output signal of the power source.
  • the second cascade always receives the first-level regulated current of the current source without any PWM
  • Cascade of LEDs also the function of a master. Because it essentially determines the overall brightness of the system, because it makes sense to put the color of LEDs, which require the highest current to produce the desired white light (ie green or mint), into this second cascade.
  • the regulation of the whole system gets a cascade structure.
  • a circuit arrangement according to the invention for operating at least one first and exactly one second cascade of LEDs therefore comprises a controllable current source which is designed to output a summation current as a function of its output provided to the power source control signal, such as a dimming signal to provide.
  • a control device which in turn comprises: at least a first PWM output for providing a first PWM signal; an output for providing the control signal to the power source; an actual value input for detecting the instantaneous actual value of the total current through all cascades of LEDs; and at least one setpoint input for receiving a signal influencing the setpoint value of the summation current through all cascades of LEDs.
  • the circuit arrangement further comprises an adder device for providing to the control device a signal proportional to the sum of the actual values of the currents through all the cascades of LEDs, the adder device comprising a first ohmic resistor, thus forming between all cascades of LEDs, forming a summing node and a first
  • Reference potential is coupled, that it is flowed through by the sum of the actual values of the currents through all cascades of LEDs.
  • Each first cascade of LEDs is one
  • a driving device comprising: a serially arranged to the respective cascade of LEDs first electronic switch with a control electrode, a working electrode and a reference electrode; a
  • Operational amplifier circuit for controlling the current through the respective cascade of LEDs with a
  • Operational amplifier whose output is coupled to the control electrode of the first electronic switch and whose negative input is supplied with a signal which is proportional to the current through the respective LED cascade;
  • Adding means and the first reference potential is coupled, wherein the tap of the voltage divider is coupled to the positive input of the operational amplifier; and a second electronic switch having a control electrode, a working electrode and a reference electrode, the control electrode being coupled to the first PWM output associated with the respective first LED cascade, wherein the
  • Reference potential is coupled, at least the
  • Power source can be powered instead of a voltage source. This further results in a high efficiency of the circuit arrangement.
  • Circuitry can be used during each on-time
  • the present invention accordingly makes decoupling in a simple manner possible
  • Brightness and color space achieved, so that both sizes can be set separately.
  • Adding device comprises an ohmic resistance between the reference electrode of the respective first
  • the electronic switch and the summing node is coupled.
  • the voltage drop across the respective resistor is used to determine the current flowing through the respective first LED cascade, in particular around it
  • the adding device preferably comprises a
  • Operational amplifier is coupled to the tap of the voltage divider.
  • a so connected voltage divider is a negative feedback for the
  • the circuit arrangement preferably comprises a further voltage divider with an ohmic resistance and an NTC resistor, wherein the further voltage divider of the current source is connected in parallel, wherein the tap of the other
  • Control device is coupled. In this way, an automatic control of the brightness and the color location as a function of the temperature is made possible.
  • another setpoint input represents the
  • Control device is a dimming signal input for supplying a dimming signal. This allows a simple way dimming while keeping constant the color location.
  • the operational amplifier has each
  • the advantage results in a more accurate and faster feedback, since the Feedback circuit comprises fewer components, so also significantly more compact and thus less susceptible to interference is formed.
  • the Feedback circuit comprises fewer components, so also significantly more compact and thus less susceptible to interference is formed.
  • Circuit arrangement two first cascades of LEDs and a second cascade of LEDs.
  • a cascade of LEDs comprises LEDs that are in the blue
  • Wavelength range a cascade of LEDs comprises LEDs emitting in the red wavelength range, and includes a cascade of LEDs LEDs that radiate at least in the sum in the green wavelength range. In this way, almost any, in practice relevant color location can be controlled.
  • control device has a
  • control device comprises a memory device, in the rule polynomials for controlling a predetermined color location
  • Fig. 1 in a schematic representation a first
  • Fig. 2 is a schematic representation of a second
  • Fig. 3 is a graph for calculating the rule polynomials for
  • Wavelength range from the temperature at constant color location and constant, output from the power source total current.
  • Fig. 1 shows a schematic representation of a first
  • Circuitry This includes a taxable item.
  • Control device 12 which may in particular represent a microcontroller, applied to the current source IQ
  • Controller 12 includes a first PWM output PWMl for providing a first PWM signal and a second PWM output PWM2 for providing a second PWM signal. It also comprises an output IS for providing the control signal St to the current source I Q.
  • a first actual value input ADC1 is used to detect a temperature of
  • a second actual value input ADC2 is used to detect the instantaneous actual value of a total current through all the cascades of LEDs of the circuit arrangement 10, which will be discussed in greater detail below, which is proportional to the total current I ges output by the current source IQ. It also includes a setpoint input ADC3 for Receiving a dimming signal DIM. Another setpoint input ADC4 is used to receive a setpoint signal FO for the color location.
  • the input ADC1 of the control device 12 is coupled to the tap of a voltage divider which is connected in parallel with the current source IQ and comprises an ohmic resistor RIO and a temperature-dependent resistor NTC1.
  • the circuit arrangement 10 comprises three different cascades of LEDs, wherein the
  • An LED cascade according to the present invention comprises
  • At least one LED but usually several LEDs.
  • the LED cascade LEDl emits in the red wavelength range, the LED cascade LED2 in the blue wavelength range and the LED cascade LED3 in the green wavelength range.
  • the current flowing through the first LED cascade LED1 is I DI
  • the circuitry includes an adder 14 for providing a signal at the input ADC2 of FIG.
  • Control device 12 which is proportional to the sum of the actual values of the currents I DI, I D2, I D3 through all cascades of LEDs LEDl, LED2, LED3.
  • the adder 14 comprises an ohmic resistor R3, the formation of a
  • the adder 14 further comprises an operational amplifier IC2 and a voltage divider comprising the ohmic resistors R8 and R9.
  • the voltage divider R8, R9 is between the
  • the plus input of the operational amplifier IC2 is coupled to the summing node Nl, wherein the negative input of the operational amplifier IC2 with the tap of the
  • Voltage divider R8, R9 is coupled.
  • the LED cascade LED1 is assigned a drive device 16a
  • the LED cascade LED2 is assigned a drive device 16b.
  • the LED cascade LED3 has no such drive device.
  • the LED cascade LED1 is assigned a drive device 16a
  • the LED cascade LED2 is assigned a drive device 16b.
  • the LED cascade LED3 has no such drive device.
  • the drive device 16a accordingly comprises a first electronic switch Tla arranged in series with the LED cascade LED1, having a control electrode, a working electrode and a reference electrode. It includes one
  • Operational amplifier circuit for controlling the current I D I through the cascade LED1 with an operational amplifier ICla whose output is connected to the control electrode of the first
  • Reference electrode of the electronic switch Tla and the summing node Nl is coupled.
  • a voltage divider comprising the ohmic resistors R4a and R5a is coupled between the output of the operational amplifier IC2 of the adder 14 and the reference potential, the tap of the Voltage divider R4a, R5a is coupled to the positive input of the operational amplifier ICla.
  • the drive device 16a further comprises a second electronic switch T2a with a control electrode, a working electrode and a reference electrode, wherein its
  • Control device 12 is coupled, wherein its
  • Working electrode is coupled to the tap of the voltage divider R4a, R5a and its reference electrode with the
  • the series circuit comprising the LED cascade LED1, the distance working electrode reference electrode of the first electronic switch Tla and the ohmic resistor Ria are connected in series between the output of
  • the LED cascade LED3 is coupled without further components between the output of the current source I Q and the summing node Nl of the adder 14.
  • the negative reference potential terminals of the operational amplifiers ICla and IClb are coupled to the summing node Nl.
  • the voltage divider R4a, R5a, corresponding to R4b and R5b, as well as R8 and R9 can also be designed as non-linear voltage dividers, for example, in that one of the two ohmic resistors is replaced by a diode.
  • the voltage divider R8, R9 is a negative feedback for the operational amplifier IC2, so that this linearly converts the voltage drop across the resistor R3 voltage to the value range of the input ADC2 of the control device 12.
  • the actual value of the sum current proportional size at the output of the operational amplifier IC2 is provided by means of the voltage divider R4a, R5a, and R4b, R5b adapted to the value range of the above ohmic
  • the control circuit in which the operational amplifier ICla is active is shown in dashed lines and is, as can be seen, very compact; It is characterized by short distances and therefore reacts very fast.
  • Operational amplifier ICla and IClb is at the potential of the summing node Nl, the offset of these operational amplifiers ICla and IClb can be compensated in a simple manner.
  • these operational amplifiers ICla and IClb are connected to the reference potential of the control device 12 as shown below with reference to FIG. 2, and 0 V are applied to the input of the operational amplifiers ICla and IClb, the respective operational amplifiers ICla and IClb output the same Offset voltage off. This then causes an undesirable current flow through the
  • a system of three adjustment knobs can be made in the embodiment of Figure 1 thus:.
  • the currents I DI, I D2 and I D3 can be adjusted in terms of their amplitude, whereby the brightness and the color locus of the output from the circuit arrangement in Fig. 1
  • Circuit arrangement 10 according to the invention differs from the embodiment illustrated in FIG. 1 in that the negative reference potential terminal of FIG. 1
  • Op Amp ICla and IClb is not included.
  • control device 12 comprises a memory device 18, are stored in the rule polynomials for controlling a predeterminable color locus.
  • These rule polynomials are at least of the second degree and give the dependence of the currents I DI, I D2 by the cascades LED1, LED2 of
  • the LEDs are measured to derive the rule polynomials.
  • the polynomials are created from the measured values.
  • the system of current regulation is designed as follows:
  • Iges is the input current coming from the current source IQ
  • IDI and ID2 are dependent on the temperature T and the magnitude of the amplitude of the total current I ges .
  • ID3 is unregulated and corresponds to the difference between I tot and the sum of IDI and ID2.
  • ⁇ ⁇ ( ⁇ ⁇ + ⁇ * T + Cl * T 2 ) * (a 2 + b 2 * I gea + c 2 * I g 2
  • I m (a 3 + b 3 * T + c 3 * T 2 ) * (a 4 + b 4 * I ges + c 4 * I g 2 .
  • I ge s 700 mA was selected.
  • I m (a 1 + b 1 * T + c 1 * T 2) * (0.019897 + 0.001625 * 1 tot + 0.000000016767 * I g 2
  • FIG. 5 shows the distribution of the brightness PhiV over the chromaticity coordinate CCT at a constant total current I ges .
  • the brightness of the 2700K color temperature initially increases as the color temperature increases.
  • the connecting line runs between the color loci of the red-emitting LEDs of a first cascade and the greenish-emitting LEDs of the second Cascade approximately on the Planckian curve, the blue emitting LEDs are almost switched off, only the greenish emitting LEDs have to be controlled brighter.
  • constant total current leads the
  • Brightness is a result of the color location. To even out the brightness across all color locations, the
  • Control device 12 via its control output IS readjust the all-supplying current source IQ, for example, with a factor that is complementary to the color locus to Fig. 5 runs.
  • the amplified sum current signal visum see Fig. 1 and Fig. 2, is given not only to the control device 12, but through the voltage divider R4a , R5a is also divided down to the setpoint input of the operational amplifier ICla.
  • this gate controls its output so far that the transistor Tla becomes conductive so far (in the linear range) that the voltage across the ohmic
  • Resistor Ria plus the voltage across the resistor R3 ie the raw measured value of the cumulative current is equal to the voltage across the resistor R5a.
  • IDI (R5a / (Ria (R4a + R5a))) * V Lsum - (R3 / Rla) * I ges.
  • IDI [(R5a * R9 / (Ria (R4a + R5a) (R8 + R9))) - (R3 / Rla)] * I or
  • IDI [(R5a / (Ria (R4a + R5a))) - (R3 (R8 + R9) / (Rla * R9))] * Iges The factor before visa is in the control device 12
  • ID2 Average value of IDI can be determined.
  • the factor for the calculation of ID2 as a function of I ges or depending on visa can be determined.
  • ID2 [(R5b * R9 / (RLB (R4b R5b +) (R8 + R9))) - (R3 / RLB)] * I ges or:
  • ID2 [(R5b / (RLB (R4b R5b +))) - (R3 (R8 + R9) / (RLB * R9))] * I ges.
  • ID3 applies accordingly: and thus:
  • I D 3 1 - ⁇ [(R 5a / (Ria (R 4a + R 5a))) - ( R 3 (R 8 + R 9) / (R a I * R 9))] +

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  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

La présente invention concerne un ensemble circuit (10) permettant de faire fonctionner plusieurs cascades de DEL montées en parallèle. Lesdites DEL sont excitées par une source de courant commandable, les courants étant régulés à travers les n-1 cascades, et la énième cascade servant de soupape de décharge. Des signaux de modulation d'impulsions en durée sont utilisés dans le cadre de la régulation.
PCT/EP2016/055555 2015-03-31 2016-03-15 Ensemble circuit permettant de faire fonctionner au moins une première et une seule seconde cascade de del WO2016156030A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015205808.5A DE102015205808A1 (de) 2015-03-31 2015-03-31 Schaltungsanordnung zum Betreiben zumindest einer ersten und genau einer zweiten Kaskade von LEDs
DE102015205808.5 2015-03-31

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Publication Number Publication Date
WO2016156030A1 true WO2016156030A1 (fr) 2016-10-06

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WO (1) WO2016156030A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017203801B3 (de) * 2017-03-08 2018-03-08 Karlsruher Institut für Technologie Vorrichtung und Verfahren zur Ansteuerung einer Vielzahl von Leuchtdioden
DE102017113013B4 (de) 2017-06-13 2022-08-25 Vossloh-Schwabe Deutschland Gmbh Betriebsgerät und Verfahren zum Betreiben eines Betriebsgeräts
DE102018128847A1 (de) * 2018-11-16 2020-05-20 Osram Opto Semiconductors Gmbh Optoelektronische Leuchtvorrichtung und Verfahren zum Steuern einer optoelektronischen Leuchtvorrichtung

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WO2008041153A1 (fr) * 2006-10-06 2008-04-10 Philips Intellectual Property & Standards Gmbh Dispositif d'alimentation électrique pour éléments lumineux et procédé d'alimentation d'éléments lumineux
US20130063035A1 (en) * 2011-09-12 2013-03-14 Juno Manufacturing, LLC Dimmable led light fixture having adjustable color temperature
DE102012203746A1 (de) * 2011-12-23 2013-06-27 Tridonic Gmbh & Co. Kg Verfahren und Schaltungsanordnung zur Erzeugung von weissem Licht mittels LEDS
EP2760254A1 (fr) * 2013-01-25 2014-07-30 Dialog Semiconductor Inc. Ajustement de la température de couleur dans un système d'éclairage à DEL à intensité réglable
GB2517455A (en) * 2013-08-20 2015-02-25 Harvard Engineering Plc Light Apparatus

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DE19848925B4 (de) 1998-10-23 2010-04-29 Lumino Licht Elektronik Gmbh Verfahren und Schaltungsanordnung zur Ansteuerung von Leuchtdioden
DE602004015617D1 (de) * 2004-11-23 2008-09-18 Dialog Semiconductor Gmbh Kombinierter exponentieller und linearer RGB LED-Stromsenkender Digital-Analaog-Wandler
ATE385166T1 (de) 2005-02-02 2008-02-15 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren und anordnung zum dimmen von lichtquellen
DE102010000672A1 (de) * 2010-01-05 2011-07-07 Tridonic Ag Kombiniertes Verfahren zum Betreiben eines elektrischen Leuchtmittels sowie Betriebsschaltung
DE102011089885A1 (de) * 2011-12-23 2013-06-27 Tridonic Gmbh & Co. Kg Dimmbarer Konverter und Dimmverfahren für LEDs

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Publication number Priority date Publication date Assignee Title
WO2008041153A1 (fr) * 2006-10-06 2008-04-10 Philips Intellectual Property & Standards Gmbh Dispositif d'alimentation électrique pour éléments lumineux et procédé d'alimentation d'éléments lumineux
US20130063035A1 (en) * 2011-09-12 2013-03-14 Juno Manufacturing, LLC Dimmable led light fixture having adjustable color temperature
DE102012203746A1 (de) * 2011-12-23 2013-06-27 Tridonic Gmbh & Co. Kg Verfahren und Schaltungsanordnung zur Erzeugung von weissem Licht mittels LEDS
EP2760254A1 (fr) * 2013-01-25 2014-07-30 Dialog Semiconductor Inc. Ajustement de la température de couleur dans un système d'éclairage à DEL à intensité réglable
GB2517455A (en) * 2013-08-20 2015-02-25 Harvard Engineering Plc Light Apparatus

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