EP2897444B1 - Circuit d'alimentation de courant DEL - Google Patents

Circuit d'alimentation de courant DEL Download PDF

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Publication number
EP2897444B1
EP2897444B1 EP15151415.5A EP15151415A EP2897444B1 EP 2897444 B1 EP2897444 B1 EP 2897444B1 EP 15151415 A EP15151415 A EP 15151415A EP 2897444 B1 EP2897444 B1 EP 2897444B1
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EP
European Patent Office
Prior art keywords
led
circuit
arrangement
trim
terminals
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.)
Active
Application number
EP15151415.5A
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German (de)
English (en)
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EP2897444A1 (fr
Inventor
Hans Haselberger
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.)
Siteco GmbH
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Siteco GmbH
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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]
    • H05B45/20—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 circuit for an LED power supply, in particular for the electrical supply of an arrangement of one or more LEDs connected, for example, in series (light-emitting diodes, which also include organic light-emitting diodes).
  • LEDs are being used to an ever greater extent for lighting equipment such as indoor and outdoor lights.
  • Circuit arrangements so-called LED drivers, are known for the electrical supply of the LEDs.
  • a circuit arrangement for power supply is often provided in the prior art, which has several connection terminals, each connection terminal being intended to deliver a predetermined current intensity (see e.g. Figure 1a ).
  • DE 10 2013 206 309 A1 discloses the operation of lighting means, in particular LEDs, with a circuit which provides a constant average controlled first current at a pair of connecting terminals for a first LED channel and a second circuit control which provides a regulated output current for a second LED channel.
  • EP 0 660 648 A1 discloses a dimming circuit for an LED array.
  • a regulated output current for an arrangement of LEDs connected in parallel and in series is provided at a pair of connections.
  • Optotronic LED Power Supply Product Data Sheet OTe 25 / 220-240 / 420 CS Constant Current LED Power Supply 290mA-350mA-420MA discloses a circuit for LED power supply according to the preamble of claim 1.
  • a disadvantage of these LED drivers is that the supply current for the LEDs through the driver arrangement can only be selected from a limited number of permanently specified current intensities.
  • the object of the present invention is to provide a circuit for LED power supply which can implement setting of the supply current intensity for an arrangement of at least one LED in the simplest possible way.
  • the invention provides a circuit for LED power supply which comprises: an electrical ballast for connecting an arrangement of at least one LED, the electronic ballast having a first connection terminal to which the arrangement of at least one LED is connected an electrode, preferably the anode, is connected, and has a plurality of second connection terminals, to which the arrangement of at least one LED with the second electrode, preferably with the cathode, can optionally be connected to the at least one LED with one of the selected second connection terminal corresponding To supply current strength, wherein a trimming resistor is also provided, which is connected in parallel to two of the second connection terminals in order to set the selected supply current strength.
  • a trimming resistor is connected in parallel between two second connection terminals, at least one of which is not occupied by the second electrode of the LED arrangement.
  • the current intensity is influenced by the trimming resistor, which is made available by the electronic ballast at the selected connection terminal. In this way, the current intensity for supplying the at least one LED can be set very easily.
  • the restriction to the discrete current strengths specified by the electronic ballast is thereby overcome without having to influence the electronic ballast itself.
  • the trimming resistor is connected between the selected second connection terminal, to which the second electrode of the arrangement of at least one LED is applied, and a further second connection terminal, which is at a lower or higher potential than the selected connection terminal.
  • the anode of the LED arrangement lies against the first connection terminal and the cathode of the arrangement comprising at least one LED lies against the selected second connection terminal.
  • the trimming resistor is connected between the selected second connection terminal and a connection terminal with a lower potential.
  • the supply current strength in this embodiment is set to a value which is between the current intensity is which corresponds to the current intensity of the selected second connection terminal and the one further second connection terminal to which the trimming resistor is clamped.
  • the supply current intensity can be between 200 mA (trimming resistor very high) and 700 mA, depending on the size of the trimming resistor mA (trim resistance very low) can be set.
  • the invention can also provide an electronic ballast in which the connection terminal for the anode of the arrangement can be selected at least one LED.
  • the trimming resistor is applied between the selected second connection terminal and a further second connection terminal which has a higher potential than the selected second connection terminal.
  • the trim resistor is adjustable, e.g. in the form of a rotary or slide potentiometer.
  • the supply current strength can be set in a particularly simple manner. If, for example, the trimming resistor is connected to the selected second connection terminal and a further second connection terminal with a higher or lower potential, and the resistance can be adjusted from almost zero to almost insulating, any supply current intensity between the current intensity of the selected one can be set by adjusting the adjustable trimming resistor corresponds to the second connection terminal and the current intensity which corresponds to the further second connection terminal can be set.
  • the electrical ballast has at least three, four, five, six, seven or eight second connection terminals.
  • the invention can already be implemented with two second connection terminals, a larger number of second connection terminals is advantageous because this allows the upper and lower limit values for the adjustable supply current to be selected in a larger range or with a finer gradation.
  • the electronic ballast is set up in such a way that the second connection terminals each supply a constant current intensity through the at least one LED.
  • the electronic ballast acts as a constant current source, the constant current source making available different but constant current intensities at the respective second selectable connection terminals via a voltage divider.
  • the one or more LEDs are preferably supplied with a constant current source (in contrast to a constant voltage source) in order to be able to operate different numbers of LEDs or LEDs of different construction types.
  • LEDs can also age over time, which changes their internal resistance. By supplying a constant current (as opposed to a constant voltage), the aging effect then has little or no effect on the brightness of the LED.
  • the constant current intensity can be a current between 10 mA and 5000 mA, preferably between 30 mA and 1500 mA, e.g. between 200 mA and 700 mA.
  • the currents mentioned can e.g. can be tapped with five different intermediate values from the electronic ballast.
  • the trimming resistor enables a further setting option between the respective constant currents mentioned.
  • the arrangement of at least one LED comprises a row of several LEDs, the first and the second electrode of the arrangement being defined by the outermost electrode of the first or the last LED within the row. It is also possible for one or more LEDs or rows of LEDs to be connected in parallel. In each case, the common anode or the common cathode of the first or last LED in the multiple LED rows connected in parallel forms the first or second electrode of the arrangement.
  • the arrangement of several LEDs in a row has the advantage that the supply voltage for the LEDs is higher, so that the power loss due to the ohmic resistance in the supply lines is lower. Even if an LED should fail within a row of LEDs, this does not necessarily lead to the failure of the entire row of LEDs, because in the case of a defective LED, a short circuit is usually formed across the defective LED. For safety, however, several rows of LEDs can be provided in parallel, so that at least the LEDs in the remaining parallel rows continue to operate if one LED in a row causes an interruption due to a defect.
  • the arrangement of one or more LED rows can be operated on the power supply according to the invention, regardless of the number of LEDs within the rows, because the power supply provides a constant supply current in accordance with the selected connection terminals and the trimming resistor.
  • the plurality of second connection terminals in the electronic ballast are each arranged at a node between a row of resistors, a voltage dropping across the row of resistors.
  • the supply voltage at the first connection terminal for supplying the connected arrangements of at least one LED can be regulated such that a constant current intensity always flows between the first connection terminal and the selected second connection terminal.
  • the voltage for the LED supply at the first connection terminal is readjusted according to the measured voltage drop across the series of resistors, so that the current through the arrangement of at least one LED remains constant. If different second connecting terminals are selected for connecting the second electrode of the LED arrangement, while the voltage drop is always measured across the whole series of resistors, a correspondingly different constant current is established through the LED arrangement. This corresponds to a constant current source with several selectable discrete currents. In connection with the further development according to the invention, however, the advantage is achieved that the constant current intensity can be freely adjusted over a wide range with the aid of the trimming resistor.
  • the trimming resistor can also be formed by a low-resistance resistor, in particular by a wire bridge.
  • This embodiment can be particularly simple and inexpensive, e.g. manufacture in a robot assembly system.
  • more than one trimming resistor can be provided between two of the second connection terminals.
  • the multiple trimming resistors can also be formed by multiple wire bridges.
  • an LED driver 4 is shown, to which an LED 2 is connected. It should be understood that the LED 2 only symbolically represents an arrangement of LEDs, which can also include several LEDs in a series or parallel connection.
  • the LED driver 4 has a first connection terminal (LED +) to which the anode of the LED 2 is connected. Furthermore, the LED driver 4 has several, in the example shown, four second connection terminals LED, to which the cathode of the LED 2 can optionally be connected. Every second connection terminal LED- is designed to provide a constant current to supply the LED, with the connections providing discrete currents of 200 mA, 350 mA, 500 mA and 700 mA. In the figure 1a the connection terminal with 500 mA is selected to connect the cathode of LED 2. Accordingly, the LED is supplied with a current of 500 mA.
  • the LED is connected between the connection terminal LED + and the connection terminal LED- with 200 mA. Furthermore, a trim resistor R Trim is connected in parallel between the connection terminal LED- with 200 mA and the connection terminal LED- with 700 mA. Without the trimming resistor, a current of 200 mA would flow through the LED 2. However, the current strength is increased by the trimming resistor R Trim . The current intensity through the LED is between 200 mA and 700 mA, depending on the height of the trimming resistor. By choosing the trim resistor R Trim , the supply current through the LED can therefore be adjusted.
  • the trimming resistor R Trim can be an adjustable potentiometer which can be adjusted between a very low-resistance and a very high-resistance value. This allows the current intensity through the LED to be freely set from 200 mA to 700 mA.
  • the electronic ballast 4 (in the Figures 1a and 1b referred to as LED driver 4) includes as in Figures 1a and 1b a first connection terminal LED + for connecting the cathode of an LED arrangement 2 and four second connection terminals LED-, which provide discrete currents of 200 mA, 350 mA, 500 mA and 700 mA.
  • the LED arrangement 2 is in the Figure 2 shown as a row of several LEDs. The anode of the first LED in the LED row is connected to the connection terminal LED +, while the cathode of the last LED in the row is connected to the connection terminal for 200 mA.
  • a trim resistor R Trim is connected in parallel between the connection terminal for 200 mA and the connection terminal for 700 mA.
  • the current intensity for supplying the LED arrangement can be set between 200 mA and 700 mA by selecting the trimming resistor.
  • the electronic ballast acts as a constant current source.
  • the electronic ballast measures the voltage drop across a series of resistors R 1 , R 2 , R 3 and R 4 , ie between the first connection terminal at U I_sense and GND.
  • the voltage at the connection terminal LED + is readjusted so that a constant current of 200 mA flows through the LED arrangement 2.
  • the electronic ballast also sees further connection terminals at the nodes in the resistor chain R 1 to R 4 .
  • I. LED U I. _ sense R.
  • Figure 3 shows the circuit arrangement Figure 2 , the circuit with a trim resistor is shown in the last column, while a circuit without a trim resistor is shown in columns I 1 to I 4 .
  • a current of 200 mA, 350 mA, 500 mA or 700 mA can be selected depending on the selection of the connection terminal for the cathode of the LED arrangement.
  • the current can be dependent on the trimming resistor, as in connection with the Figure 2 explained between 200 mA and 700 mA can be freely set depending on the value of the trimming resistor in relation to the resistor R 1 + R 2 + R 3 .
  • the cathode of the LED arrangement is connected to the same connection terminal as one end of the trimming resistor. This is not absolutely necessary.
  • the trimming resistor can also be connected between two other connection terminals of the electronic ballast, which are provided for the cathode of the LED arrangement.
  • the current strength available for supplying the LED can be calculated accordingly from the series or parallel connection of the resistors R 1 to R 4 and R Trim , as shown above.
  • the LED arrangement 2 in the Figures 1a and 1b consists of only one LED while in the Figures 2 and 3 an arrangement 2 of several LEDs in series is shown. It is to be understood, however, that the LED arrangement 2 can generally be formed from a series and / or parallel connection of several LEDs.
  • the arrangement in a row has the advantage that a higher voltage can be used to supply the LEDs, so that the power loss due to the ohmic resistance of the supply cables is reduced.
  • the parallel connection has the advantage that in the event of a defect in an LED that causes the circuit to be interrupted, the other LEDs connected in parallel remain in operation. Since the electronic ballast regulates to a constant current, it is irrelevant in the context of the maximum supply voltage made available how many LEDs are connected in series to the electronic ballast. If LEDs are connected in parallel, the supply current is increased accordingly. This can be done by selecting the second connector and the strength of the trim resistor.
  • electronic ballasts can be provided with more or fewer connection terminals for the cathode of the LED arrangement. In the simplest embodiment, only two cathode connection terminals are required. However, electronic ballasts with more than four connection terminals, as shown in the figures, can be used.
  • the invention is not limited to electronic ballasts which only provide different connection terminals for the cathode. It is also possible to use ballasts to use, which instead or in addition provide several connection terminals for the anode of the LED arrangement.
  • the trimming resistor can be switched between connection terminals with a lower or higher potential than the connection terminal selected for the LED arrangement 2 in order to increase or decrease the LED supply current.
  • Figure 4 shows a further embodiment of a circuit arrangement with a trimming resistor, the trimming resistor between two second connecting terminals, which are in the Figure 4 designated as 23 and 27 is connected.
  • the LED arrangement 2 is connected between the first connection terminal LED + and a selected second connection terminal, which in this example forms the terminal 22.
  • the trimming resistor is not connected to the selected second connection terminal to which the one electrode of the LED arrangement is connected.
  • FIG. 5 shows a further circuit arrangement with a trimming resistor, which in this embodiment is formed by a wire bridge.
  • This embodiment represents the special case that the trimming resistor is low-resistance.
  • trimming resistors are connected between two second connection terminals.
  • the trimming resistors in this embodiment are also low-ohmic, ie formed by a wire bridge.

Landscapes

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

Claims (8)

  1. Circuit d'alimentation de courant DEL, qui comprend ce qui suit :
    un ballast (4) électrique pour la connexion d'un ensemble (2) composé d'au moins une DEL, le ballast électronique comportant une première borne de connexion (LED+) au niveau de laquelle l'ensemble (2) composé d'au moins une DEL est connecté à une électrode, de préférence l'anode, et comportant plusieurs deuxièmes bornes de connexion (LED-) au niveau desquelles l'ensemble (2) composé d'au moins une DEL peut au choix être connecté à la deuxième électrode, de préférence la cathode, pour alimenter l'ensemble composé d'au moins une DEL avec une intensité de courant discrète correspondant à la deuxième borne de connexion (LED-) sélectionnée parmi les plusieurs deuxièmes bornes de connexion, l'intensité de courant d'alimentation étant une intensité de courant constante ;
    caractérisé en ce que les plusieurs deuxièmes bornes de connexion (LED-) dans le ballast (4) électronique sont disposées respectivement au niveau d'un nœud respectif entre une rangée de résistances (R1 à R4) qui font partie du ballast (4), le circuit comprenant en outre une résistance d'équilibrage (RTrim) qui est montée entre deux des plusieurs deuxièmes bornes de connexion (LED-), le circuit étant agencé pour continuer à régler l'intensité de courant d'alimentation discrète choisie au moyen de la résistance d'équilibrage, le ballast électronique étant constitué de façon à mesurer une chute de la tension (UI-sense) sur la rangée complète de résistances (R1 à R4) pour la régulation de l'intensité de courant d'alimentation discrète pour l'ensemble (2) composé d'au moins une DEL.
  2. Circuit d'alimentation de courant DEL selon la revendication 1, la résistance d'équilibrage (RTrim) étant montée entre la deuxième borne de connexion (LED-) sélectionnée, au niveau de laquelle est positionnée la deuxième électrode de l'ensemble (2) composé d'au moins une DEL, et une autre deuxième borne de connexion (LED-).
  3. Circuit d'alimentation de courant DEL selon l'une des revendications précédentes, la résistance d'équilibrage (RTrim) étant réglable.
  4. Circuit d'alimentation de courant DEL selon l'une des revendications précédentes, le ballast (4) électronique comportant au moins trois, quatre, cinq, six, sept ou huit deuxièmes bornes de connexion (LED-).
  5. Circuit d'alimentation de courant DEL selon la revendication 4, l'intensité de courant constante fournissant, en fonction de la deuxième borne de connexion (LED-) sélectionnée, un courant entre 10 mA et 5 000 mA, de préférence entre 30 mA et 1 500 mA.
  6. Circuit d'alimentation de courant DEL selon l'une des revendications précédentes, avec plusieurs résistances d'équilibrage (RTrim) qui sont respectivement montées entre deux des deuxièmes bornes de connexion (LED-) pour continuer à régler l'intensité de courant d'alimentation.
  7. Circuit d'alimentation de courant DEL selon l'une des revendications précédentes, une ou, en cas de référence à la revendication 6, plusieurs des résistances de réglage (RTrim) ayant une faible valeur ohmique, étant en particulier formées par un fil de liaison.
  8. Système composé d'un circuit d'alimentation de courant DEL selon l'une des revendications précédentes et de l'ensemble composé d'au moins une DEL, l'ensemble composé d'au moins une DEL comprenant une rangée de plusieurs DEL, la première et la deuxième électrode étant définies par les électrodes les plus extérieures de la première et de la dernière DEL dans une rangée.
EP15151415.5A 2014-01-17 2015-01-16 Circuit d'alimentation de courant DEL Active EP2897444B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014100523 2014-01-17
DE102014109466.2A DE102014109466A1 (de) 2014-01-17 2014-07-07 Schaltung zur LED-Stromversorgung

Publications (2)

Publication Number Publication Date
EP2897444A1 EP2897444A1 (fr) 2015-07-22
EP2897444B1 true EP2897444B1 (fr) 2020-08-26

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Application Number Title Priority Date Filing Date
EP15151415.5A Active EP2897444B1 (fr) 2014-01-17 2015-01-16 Circuit d'alimentation de courant DEL

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EP (1) EP2897444B1 (fr)
DE (1) DE102014109466A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105072747B (zh) * 2015-07-30 2017-08-25 惠州市信迪节能环保科技有限公司 一种分段调功率的led驱动电路及led灯管
DE102015219367B4 (de) * 2015-10-07 2022-07-14 H4X E.U. Led-leuchte mit steuerschaltung
FI127981B (en) 2017-11-30 2019-06-28 Helvar Oy Ab Setting the output current for the LED ballast

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
US5459478A (en) * 1993-12-27 1995-10-17 Illinois Tool Works, Inc. Aircraft cockpit switch circuitry
DE20023993U1 (de) * 2000-03-17 2008-09-25 Tridonicatco Gmbh & Co. Kg Ansteuerschaltung für Leuchtdioden
DE102004025909A1 (de) * 2004-05-27 2005-12-22 Infineon Technologies Ag Stromversorgungsanordnung zur Stromversorgung einer Last
DE102008033176A1 (de) * 2008-07-15 2010-01-21 Automotive Lighting Reutlingen Gmbh Verfahren zum Herstellen einer Lichtquellenanordnung und Lichtquellenanordnung
DE102013206309A1 (de) * 2012-04-25 2013-10-31 Tridonic Jennersdorf Gmbh Betrieb von Leuchtmitteln
DE102012207217B4 (de) * 2012-04-30 2021-03-04 Leica Microsystems Cms Gmbh Mikroskop mit einer Beleuchtungseinrichtung

Non-Patent Citations (1)

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Title
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DE102014109466A1 (de) 2015-07-23
EP2897444A1 (fr) 2015-07-22

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