EP2796003A1 - Procédé et agencement de circuit pour produire de la lumière atténuable au moyens de led avec régulation de la température de couleur - Google Patents

Procédé et agencement de circuit pour produire de la lumière atténuable au moyens de led avec régulation de la température de couleur

Info

Publication number
EP2796003A1
EP2796003A1 EP12815674.2A EP12815674A EP2796003A1 EP 2796003 A1 EP2796003 A1 EP 2796003A1 EP 12815674 A EP12815674 A EP 12815674A EP 2796003 A1 EP2796003 A1 EP 2796003A1
Authority
EP
European Patent Office
Prior art keywords
led
auxiliary
current
voltage
path
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
EP12815674.2A
Other languages
German (de)
English (en)
Other versions
EP2796003B1 (fr
Inventor
Philip JERMYN
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
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 Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of EP2796003A1 publication Critical patent/EP2796003A1/fr
Application granted granted Critical
Publication of EP2796003B1 publication Critical patent/EP2796003B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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]
    • H05B45/40—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]
    • H05B45/20—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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules

Definitions

  • the invention relates to a method and a
  • Circuit arrangement for the dimmable generation of light In an undimmed state, the light is converted by mixing longer-wavelength light of at least a first LED and
  • the proportion of shorter-wave light is reduced.
  • the resulting light consists only of light from the first LED. The border between the longer-wave and the
  • 15 shorter-wavelength light may, for example, be at 500 nm (with respect to the peak of the spectrum).
  • intestine 1 can pass through white light
  • 25 light LED this is, for example, a blue light or UV light-emitting LED chip, which is covered with a phosphor layer, which converts the blue light or the UV light into a longer-wave light with a correspondingly different color , be generated.
  • white light can be generated by RGB (red, green, blue) mix or other mixes.
  • the invention has for its object to provide a method and a circuit arrangement which a replica of the change in color temperature in a dimming of a conventional light bulb with the least possible effort and at the same time as high
  • An operating circuit according to the invention for an LED track with at least one LED of a first type and an auxiliary LED track with at least one LED of a second type is designed to be preferably from a first
  • Power source to be supplied with an adjustable, preferably regulated total current.
  • a main current through the LED track is powered directly from the total current.
  • the operating circuit has a second current source, which is powered by the total current and supplies the auxiliary LED track with an auxiliary current.
  • Operating circuit further comprises a control circuit which controls the second current source in response to a voltage at the LED track. So can one
  • the second current source is preferably designed as a high-frequency clocked current source, in particular as a high-frequency clocked switching regulator.
  • High frequency clocked power source allows the energy to be cached and stored only
  • the control circuit is preferably designed to control, when a threshold value is exceeded by the voltage, the second current source in order to supply the auxiliary LED path with the auxiliary current and, when the voltage drops below the threshold value, the second one
  • the second power source is preferably such
  • the auxiliary current through the auxiliary LED track is constant, and so the auxiliary LED track constantly emits light, as long as the LED track a main current
  • the auxiliary current through the auxiliary LED path is subject to an amplitude dimming, so that the auxiliary LED route emits dimmed light, as long as the LED Streckek receives a main current and so emits no light. Unstable operating states can thus be safely avoided in the case of amplitude modulation.
  • the second current source is preferably designed such that, when dimming by means of pulse width modulation of the total current, the auxiliary current through the auxiliary LED path follows the course of the total current and the auxiliary LED path emits light in a dimmed manner. Thus, an afterglow of the auxiliary LED route can be avoided in a pulse width modulation operation.
  • the second current source is alternatively designed such that when dimming by means of pulse width modulation of the total current, the auxiliary current through the auxiliary LED path has no pulse width modulation and the auxiliary LED route emits light so constant and undimmed. This ensures that in a pure pulse width modulation operation, a color change occurs during dimming.
  • the control circuit preferably includes a
  • the control circuit is designed to transmit a control signal to the second current source as a function of the comparison.
  • the second current source is preferably designed to be in
  • the control circuit preferably has a switch, preferably a transistor, which generates the control signal as a function of the comparison. So can with simple circuit engineering
  • the comparator preferably has a voltage divider and a voltage reference.
  • the voltage divider then reduces the voltage by a factor.
  • the voltage reference preferably generates a reference voltage which corresponds to the threshold value reduced by the factor.
  • the comparator preferably compares the lowered operating voltage with the constant voltage of the
  • circuit means the desired behavior of the operating circuit can be achieved.
  • An LED module according to the invention comprises at least one operating circuit described above and an LED track with at least one LED of a first type and an auxiliary LED track with at least one LED of a second type.
  • the LEDs of the first type and the LEDs of the second type preferably have different
  • An LED lamp according to the invention is preferably a
  • An inventive method is used to operate an LED track with at least one LED of a first type and an auxiliary LED track with at least one LED of a second type.
  • the LED track and the auxiliary LED track are controlled by an adjustable, preferably regulated
  • a main current through the LED track is powered directly from the total current.
  • the auxiliary LED section is supplied with an auxiliary current.
  • the auxiliary current is dependent on a voltage at the LED track controlled. Unstable operating conditions can be so at a
  • Amplitude modulation can be safely avoided.
  • Fig. 1 shows a first embodiment of a
  • Fig. 2 shows a second embodiment of a
  • Fig. 3 shows a first embodiment of a
  • Fig. 4 shows an embodiment of the invention
  • At least one white LED should use an amber LED.
  • the use of one or more yellow red or RGB LEDs is also conceivable.
  • a dimming of an LED light is achieved by an amplitude modulation and / or a pulse width modulation of an operating current.
  • Pulse width modulation to achieve. That the white LED or the white LEDs are thus pulse-width modulated, while the colored LED as possible undergoes no such modulation.
  • the present invention is not limited to white or red LEDs. It is only important that at least two LED sections are used, each with at least one LED. The emission spectra of the two routes must differ to one
  • Fig. 1 shows a first embodiment of a
  • a rectifier module 20 is supplied with an AC voltage 10.
  • Rectifier module 20 generated from the AC voltage 10th a DC voltage 11.
  • the DC voltage 11 supplies a first current source 21.
  • the first current source 21 is a DC source, the
  • the rectifier module 20 is operated. It may also include the rectifier module 20 and the first current source 21 in a single module
  • a dimming device 24 generates a dimming signal 15a, which is supplied to the current source 21.
  • the current source 21 generates the current I G as a function of
  • Dimming device 24 determines the dimming signal 15a in response to a dimming value, which is e.g. of a
  • a pulse width modulation can be used.
  • the dimmer 24 generates the dimming signal 15a as a pulse width modulation signal. That the dimming signal specifies a frequency and a duty cycle of the pulse width modulation by the first current source 21.
  • Fig. 2 is a second embodiment of
  • the LED lamp according to the invention shown.
  • the structure corresponds largely to the structure of FIG. 1.
  • the LED light here includes a control device 23, which processes a signal 13, which allows conclusions about the current brightness of the light generated by the LED module 22.
  • a control device 23 which processes a signal 13, which allows conclusions about the current brightness of the light generated by the LED module 22.
  • Dimming signal 15b of the control device 23 is supplied.
  • the control device 23 generates a control signal 14 for controlling the first current source 21 from the dimming signal 15b and the brightness signal 13.
  • Control device 23 are included. For example, e.g.
  • the use of a temperature signal is very advantageous since LEDs of different types and therefore different wavelengths often have different temperature characteristics. That at a
  • Fig. 3 is a first embodiment of the
  • An LED module 22 has connections 12a, 12b. It has an LED track 30, a control circuit 40, a power source 60 and an auxiliary LED track 70.
  • the LED section 30 consists of series-connected LEDs 31-39.
  • the LEDs 31-39 here are white LEDs of a first type w.
  • the LED track30 is with the
  • Terminals 12a, 12b connected directly and is powered by the total current I G. It adjusts a main current ⁇ through the LED track 30.
  • the second current source 60 includes an integrated circuit 67, such as a device of the type
  • the integrated circuit 67 is connected via a first terminal 67 3 by means of a capacitor 62 to the terminal 12a.
  • the connection 12a here corresponds to the supply current I G.
  • Terminal 67 2 the integrated circuit 67 is directly connected to ground. It is connected via a connection 67i by means of a coupling capacitor 68 to the connection 12b
  • connection 12b here corresponds to ground.
  • connection 67 4 it is connected to a voltage divider 69 consisting of an ohmic resistor 64 and an ohmic resistor 66.
  • connection 67 5 it is furthermore connected to an inductance 65, which in turn is connected to the center of the voltage divider 69.
  • the terminal 67 5 is further connected via a diode 61 to the terminal 12 a.
  • the Voltage divider 69 is also connected to the auxiliary LED track 70.
  • the auxiliary LED track includes here only one LED 63 of a second type a. On its other side is the LED 63 with the terminal 12a
  • the second current source 60 corresponds to one here
  • the integrated circuit 67 determines the voltage drop across the resistor 64 via the voltage divider 69. The voltage drop is determined between the terminal 67 i and the terminal 67 4 . The integrated circuit 67 adjusts the current through the auxiliary LED path 70 such that the voltage drop always has a fixed value,
  • the current can thus be adjusted by selecting the resistor 64.
  • the integrated circuit 67 stores energy in the inductance 65.
  • the energy stored in the inductance 65 is used to generate the constant current as an output signal.
  • the energy stored in the inductor 65 changes over time. As long as a voltage is applied between the terminals 12a, 12b, the energy stored in the inductance 65 increases or remains constant at its maximum value. As long as no voltage is applied to the terminals 12a, 12b, the energy stored in the inductance 65 decreases, while the constant current source 60 continues to generate a constant current as an output signal and the LED 63 supplies.
  • the inductance 65 is designed so small that the LED module 22 according to the invention meets the special property of the color change in the course of dimming only with an amplitude modulation. That the energy in the inductance is not enough to one
  • the inductance 65 is designed such that the operating current for the LED 63 is sufficient even with a minimum duty cycle of the pulse width modulation in order to permanently supply the LED 63 with a constant current.
  • the inductance 65 is designed such that the operating current for the LED 63 is sufficient even with a minimum duty cycle of the pulse width modulation in order to permanently supply the LED 63 with a constant current.
  • Pulse width modulation can be maintained.
  • the input of the current source 60 acts as a load
  • Route30 is in operation.
  • the voltage U G is kept at a fixed value by the LED path 30 in this case. This provides a source of low impedance for the current source 60. Thus, problems only arise while the LED track 30 is nonconductive. This is at power up, at power off and at a
  • the current source 21 During power up, or at the rising edge of each pulse width modulation pulse, the current source 21 must ramp up its output voltage until the LED trace 30 becomes conductive. If the power source 60 is connected, so a very large current is drawn, resulting in a
  • Constant current source 60 by means of a control circuit 40 causes to show in terms of their current-voltage characteristic of the behavior of an LED track. That is, the current source 60 is caused, only from a threshold value, a part I 2 of the operating current I G
  • control circuit 40 takes. The following will discuss the exact function of the control circuit 40.
  • the control circuit 40 has a voltage divider 51 consisting of ohmic resistors 41 and 42, which also connected to the terminals 12a and 12b.
  • the center of the voltage divider 51 is connected to a negative input of an operational amplifier 45.
  • the center of the voltage divider 51 is connected to a negative input of an operational amplifier 45.
  • a voltage divider 52 is formed by an ohmic resistor 43 and a Zener diode 46.
  • the operational amplifier 45 thus compares a through the first voltage divider 51 in the ratio of the resistors 41, 42 lowered operating voltage U G with the breakdown voltage of the Zener diode 46. outweighs the decreased operating voltage U G, is so the
  • Operational amplifier 45 at its output a LOW signal. In contrast, outweighs the breakdown voltage of
  • Zener diode 46 the operational amplifier 45 outputs a HIGH signal at its output.
  • the voltage divider 53 consists of ohmic resistors 47 and 49. At the midpoint of the voltage divider 53, the signal becomes the base of a
  • Transistor 48 is supplied.
  • the collector is connected via an ohmic resistor 50 to ground.
  • the emitter of the transistor 48 is connected to the power source 60.
  • the transistor 48 here has the function of a switch. That when the operational amplifier outputs a HIGH signal at its output, the collector-emitter path of the transistor 48 becomes conductive.
  • the emitter of the transistor 48 is connected to the terminal 67 4 of the integrated circuit 67. Is the Transistor conductive, a voltage drop is at the
  • Terminal 67 4 generated because the current through the transistor 48 via the resistor 66 is pulled.
  • the said voltage drop leads to a shutdown of
  • Power source 21 which supplies the LED module 22, can reach a stable operating state before the
  • Transistor 48 becomes nonconductive and an artificial voltage drop at terminal 67 4 no longer becomes
  • the power source 60 thus starts operating. Since there is already a significant current flow Ii through the LED path 30, the negative current-voltage characteristic of the current source 60 can no longer adversely affect the current source 21.
  • the amplification factor of the operational amplifier 45 can be set.
  • the amplification factor can be the current-voltage characteristic of the overall circuit
  • a low gain provides a "soft" threshold, which results in the auxiliary LED link 70 not being switched on instantaneously but slowly when the threshold is exceeded by the voltage U G. If a pulse width modulation takes place, then the process of turning on and off the constant current source 60 takes place at each individual pulse. In the case of the amplitude modulation of the operating current I G , the process mentioned only once at
  • Circuit 67 has its own pulse width modulation of
  • Duty cycle of the auxiliary LED track 70 performs.
  • the integrated circuit 67 is informed of the dimming value of the auxiliary LED path 70 via an additional signal.
  • the pulse width modulation of the auxiliary LED path 70 is completely independent in this case
  • Buffer capacitor be arranged as energy storage.
  • auxiliary LED path 70 is supplied with the auxiliary current I 2 , an energy buffering.
  • this energy is taken from the LED track 30.
  • the buffered energy of the buffer capacitor can be released again.
  • this energy may then be used in a further phase of the operation of the auxiliary LED track 70 to power the auxiliary LED track 70.
  • Fig. 4 is an embodiment of the
  • the method corresponds to a ramp-up of an operating voltage and the reaction of the affected circuit elements.
  • an operating voltage U G is powered up from a power source.
  • a third step 82 is continued. In the third step 82, an auxiliary LED route is activated.
  • the process continues with a fourth step 83.
  • the operating voltage U G is further increased.
  • a fifth step 84 It is now determined whether the voltage is a
  • Threshold voltage of an LED track exceeds. If this is not the case, the fourth step 83
  • a sixth step 85 is continued.
  • the LED route is activated. The said steps are repeated each time the operating voltage U G is raised .
  • the steps are carried out in the reverse order. That After an initial shutdown of the voltage, it is first checked whether the threshold voltage of the LED track has been undershot. If this is the case, then the LED route is deactivated. After further lowering of the voltage is checked whether the threshold was exceeded. As soon as the threshold value has been undershot, the auxiliary LED route is deactivated.
  • a high-frequency clocked second power source also ensures a safe and constant operation of the auxiliary LED track, since the operation of this auxiliary LED track is done by an independent of the regulation of the LED route control. At the same time, the LED track is evenly loaded by the high frequency clocked second power source, as due to the

Landscapes

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

Abstract

L'invention concerne un circuit opérationnel d'une rampe de LED (30) comprenant au moins une LED (31 - 39) d'un premier type (w) et une rampe de LED auxiliaires (70) comprenant au moins une LED (63) d'un deuxième type (a), conçu pour être alimenté par une première source de courant avec un courant total (IG) réglable, de préférence régulé. Un courant principal (I1) circulant dans la rampe de LED (30) est fourni directement par le courant total (IG). Pour cela, le circuit opérationnel présente une deuxième source de courant (60) qui est alimentée par le courant total (IG) et fournit un courant auxiliaire (I2) à la rampe de LED auxiliaires (70). Le circuit opérationnel présente en outre un circuit de commande (40) qui commande la deuxième source de courant (60) en fonction d'une tension (UG) aux bornes de la rampe de LED (30).
EP12815674.2A 2011-12-23 2012-12-20 Procédé et agencement de circuit pour produire de la lumière atténuable au moyens de led avec régulation de la température de couleur Active EP2796003B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011089816 2011-12-23
PCT/EP2012/076359 WO2013092843A1 (fr) 2011-12-23 2012-12-20 Procédé et agencement de circuit pour produire de la lumière atténuable au moyens de led avec régulation de la température de couleur

Publications (2)

Publication Number Publication Date
EP2796003A1 true EP2796003A1 (fr) 2014-10-29
EP2796003B1 EP2796003B1 (fr) 2017-09-13

Family

ID=47559403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12815674.2A Active EP2796003B1 (fr) 2011-12-23 2012-12-20 Procédé et agencement de circuit pour produire de la lumière atténuable au moyens de led avec régulation de la température de couleur

Country Status (3)

Country Link
EP (1) EP2796003B1 (fr)
DE (1) DE112012005371A5 (fr)
WO (1) WO2013092843A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015103127U1 (de) 2015-06-15 2016-09-19 Tridonic Gmbh & Co Kg LED-Modul mit veränderbarem Farbort und Beleuchtungsgerät mit einem solchen LED-Modul
DE102015223071A1 (de) * 2015-11-23 2017-05-24 Tridonic Gmbh & Co Kg Farbtemperaturdimmen von AC-versorgten LED-Strecken mittels Phaseninformation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10003766C2 (de) 2000-01-28 2002-05-08 Koch Bernd Martin Christbaumständer mit Sicherungskeilen
US20090160365A1 (en) * 2006-05-10 2009-06-25 Paavo Niemitalo Apparatus Having Supply Voltage Adaptive Light Emitting Component Circuitry And Method Of Controlling
AT506417B1 (de) * 2008-06-30 2009-09-15 Lunatone Ind Elektronik Gmbh Niederspannungsbeleuchtung
US8665922B2 (en) * 2008-10-31 2014-03-04 Sanyo Electric Co., Ltd. Driver circuit of light-emitting element
TW201038115A (en) * 2009-02-20 2010-10-16 Koninkl Philips Electronics Nv Dimmable light source with temperature shift
US8330394B2 (en) * 2010-04-09 2012-12-11 Young Lighting Technology Inc. Light source of LED and method for producing light source with varying color while dimming

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013092843A1 *

Also Published As

Publication number Publication date
WO2013092843A1 (fr) 2013-06-27
EP2796003B1 (fr) 2017-09-13
DE112012005371A5 (de) 2014-09-04

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