EP2842388A1 - Led-anordnung - Google Patents
Led-anordnungInfo
- Publication number
- EP2842388A1 EP2842388A1 EP13719089.8A EP13719089A EP2842388A1 EP 2842388 A1 EP2842388 A1 EP 2842388A1 EP 13719089 A EP13719089 A EP 13719089A EP 2842388 A1 EP2842388 A1 EP 2842388A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- current
- arrangement according
- string
- current limiter
- 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
Links
- 230000007547 defect Effects 0.000 claims description 21
- 238000003491 array Methods 0.000 claims description 16
- 230000002950 deficient Effects 0.000 claims description 12
- 230000005669 field effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
Definitions
- the present invention relates to an LED array, comprising at least one LED array, which has at least two parallel LED strands, wherein in each LED strand at least one LED is arranged.
- LEDs are now used in many different areas. For example, in lighting technology, more and more conventional light sources are being replaced by corresponding LEDs. Depending on the lighting task then some high-power LEDs or a variety of smaller or weaker LEDs can be used. In addition, it should also be noted that the LEDs are usually available only with certain output powers and for certain currents, which is why the arrangement of the LEDs in an LED array with one or more LED arrays is provided especially for small and weak LEDs.
- Such LED arrays with one or more LED arrays are used for example in area lights.
- Such an LED array with an LED array can be taken by way of example from FIG. 1, the LED array having three LED strands arranged in parallel and interconnected, all of which are connected together to a constant current source 2
- each LED strand several arranged in series or series or interconnected LEDs 1 are provided, which is why the LED array in
- the current provided by the constant current source 2 is divided equally among the individual LED strings.
- FIG. 2 shows an LED arrangement which has a plurality of LED arrays, which are each arranged or connected in series or series.
- Each of these LEDs Arrays here is identical to the LED array shown in Figure 1 constructed. Accordingly, each LED array has three parallel arranged or interconnected LED strands, in each of which a plurality of series-connected or series-connected or interconnected LEDs 1 are provided. Since the same type is usually used for the LEDs 1 within an LED array, in each case the current provided by the constant current source 2 is equally distributed to the LED strings.
- the LED arrangement shown in FIG. 1 will be used again in the further course.
- the current supplied by the constant current source 2 is distributed substantially uniformly across all the LED strings using one type for all the LEDs 1. However, this only applies until one of the LEDs 1 has a defect.
- the probability of failure of a single LED 1 is relatively low, the probability of one of the LEDs 1 having a defect increases due to the large number of LEDs 1 used in a corresponding LED arrangement is such that possibly the probability of failure of a whole LED arrangement is higher than desired.
- Damage to the still functioning LEDs may result, especially if the current through this LED string exceeds the maximum permissible LED current.
- the present invention is based on the object of further developing the LED arrangements outlined above such that, in the event of a defect in an LED, no further LEDs are damaged and the LED arrangement can continue to be operated.
- an LED arrangement according to claim 1.
- Advantageous developments of the invention are the subject of the dependent claims.
- an LED arrangement having at least one LED array, which has at least two LED strands arranged in parallel, is proposed, wherein at least one LED is arranged in each LED strand.
- a current limiter for each LED string in each LED string a current limiter for
- Limiting the current flowing in the LED string is arranged.
- the current limiter is designed to limit the current flowing in the LED string current upon reaching a predetermined limit to the limit, wherein at a current below this limit of the current limiter substantially no influence on the in the LED Strand has flowing current.
- each LED strand in addition to the LEDs nor a current limiter is arranged, which in normal operation, ie if none of the LEDs is defective, has virtually no influence on the respective LED strand and thus is inactive or invisible, so to speak.
- the current limiter is then able to compensate for the short circuit of the LED, wherein the current limiter limits the current flowing through the corresponding LED string current to a corresponding limit.
- the current is provided by a constant current source.
- at least one of the LED strands has at least two LEDs arranged in series, and that the LED arrangement has a plurality of LED arrays arranged in series.
- the current limiter arranged in the LED strings may preferably have two transistors and one resistor, wherein the transistors are a field-effect transistor and bipolar transistor and the limitation of the Current in the LED string to the limit by the field effect transistor occurs.
- the control of the bipolar transistor takes place here by the resistor.
- the current limiter may comprise a further resistor, wherein the further resistor and the bipolar transistor are then provided for controlling the field effect transistor.
- the current limiter has an additional protection circuit, for example in the form of a Zener diode, which bridges the latter in the event of the risk of excessive loading of the components of the current limiter. This case can occur, for example, when several LEDs of the same string fail.
- a Zener diode it would also be possible to use a somewhat more complex protective circuit which bridges the entire LED array in the event of too high a load on the current limiter and thus shuts it off. This variant is particularly useful when a series connection of multiple arrays is provided. In this case, the array with the defective LED will then be switched off, but the other arrays will be removed
- Figure 1 is a known from the prior art LED array with an LED array
- Figure 2 is a known from the prior art LED array with multiple LED arrays
- FIG. 3 shows an LED array according to the invention with an LED array
- FIG. 4 shows an embodiment of a current limiter
- Figure 5 shows another embodiment of a current limiter with an alternative protection circuit, which is particularly suitable for a serial arrangement of multiple LED arrays.
- LED arrangements are shown, which, as already explained above, are already known from the prior art.
- the LED arrangement in FIG. 1 has an LED array, whereas in the LED arrangement shown in FIG. 2, three LED arrays connected in series or series are provided.
- the LED arrays in turn consist of three parallel or interconnected LED strings, in each of which several arranged in series or series or
- interconnected LEDs 1 are provided.
- a constant current source 2 is additionally present, wherein the current is distributed evenly to the individual LED strands.
- FIG. 3 shows an LED arrangement according to the invention which essentially corresponds to the LED arrangement in FIG. In addition, however, each LED strand still has a current limiter 3.
- the current limiter 3 has substantially no influence on the current flowing in the LED string current.
- the limit value is chosen so that it is just above the current value, which flows through the LED string, if none of the LEDs 1 is defective. That is, the current limiter 3 in normal operation, as long as no defect of an LED 1 occurs, do not absorb power and, accordingly, no voltage drop occurs at the current limiter 3, whereby this is inactive or invisible without defect of an LED 1.
- the current rising in the corresponding LED string is then limited or limited by the respective current limiter 3 to the limit value.
- the current flowing in this LED string does not exceed the predetermined limit.
- This limitation then additionally achieves that the current flowing through the other LED strands scarcely drops, since the current provided by the constant current source 2 remains constant and is still distributed relatively uniformly over the individual LED strands. This is achieved in that in the LED strand with the
- the current limiter in the corresponding LED string rise to a value well above 1, 1 amps.
- the current limiter so correctively engages in the respective LED strand, that the current flow in this LED strand is actually limited to 1, 1 amp, whereby, accordingly, an excessive increase of the current in this LED -Strand and an excessive decrease of the current in the other LED strands is prevented.
- the corresponding current limiter thus becomes active and in this case has a corresponding voltage drop across the current limiter, as a result of which a compensation of the defective LED by the current limiter becomes possible.
- FIG. 4 shows in more detail a possible embodiment of such a current limiter.
- the current limiter has two transistors 4 and 5, two resistors 6 and 7 and a Zener diode 8.
- the transistor provided with the reference numeral 4 is a field effect transistor, which is arranged in series or series with the LEDs 1, as well as the resistance with the
- This resistor with the reference numeral 6 then controls the transistor with the reference numeral 5, which is designed as a bipolar transistor.
- the bipolar transistor 5 controls the field effect transistor 4.
- the transistors 4 and 5 and the resistors 6 and 7 are then designed so that in normal operation, so if all the LEDs 1 are functional, the devoted current flow and thus the voltage drop across the resistor 6 is dimensioned such that the
- Field effect transistor 4 is freely continuous, that is no resistance to the flow of current.
- the bipolar transistor 5 corrects and controls the field effect transistor 4 in such a way that the current flow is limited to the limit value, wherein the limit value is just above the normal current flow.
- the two transistors 4 and 5 and the two resistors 6 and 7 are used to limit the current in an LED string in which a short circuit of an LED 1 occurs.
- a short circuit is by far the most commonly occurring defect in LEDs.
- a failure of an LED in an LED string causes an interruption.
- the current in the LED string with the defective LED drops to zero.
- a constant current source 2 is provided, distributed from the Constant current source 2 provided power now no longer on three LED strands but only on two LED strands, whereby the current through these two LED strands increases significantly. If then the current increase would exceed the limit of the current limiter, the total voltage of the LED array would increase as well.
- Embodiment of the current limiter still provided an additional protection circuit in the form of a Zener diode 8, which is essentially the function of the other
- the Zener diode 8 is arranged parallel to the field effect transistor 4 and the resistor 6 and thus protects the other components of the current limiter 3 from overloading.
- the zener diode 8 is
- This protective circuit 9 is in turn arranged in parallel to the components of the current limiter 3 and consists of a parallel connection of a resistor 10 and a capacitor 11, which are connected together via a Zener diode 12 to the input of the current limiter 3.
- Resistor 10 and capacitor 11 is connected to a thyristor 13, which is connected in accordance with the illustration parallel to the LED strings.
- the Other LED strings have identical protection circuits 9, which are also connected in the manner shown with the thyristor 13.
- the current limiter in normal operation that is, when none of the LEDs is defective, has no influence on the LED strands and thus inactive or invisible and is only used in case of a defect of one of the LEDs and correcting or limiting accordingly intervenes.
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012206888A DE102012206888A1 (de) | 2012-04-26 | 2012-04-26 | LED-Anordnung |
PCT/EP2013/058627 WO2013160400A1 (de) | 2012-04-26 | 2013-04-25 | Led-anordnung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2842388A1 true EP2842388A1 (de) | 2015-03-04 |
EP2842388B1 EP2842388B1 (de) | 2017-10-04 |
Family
ID=48190965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13719089.8A Not-in-force EP2842388B1 (de) | 2012-04-26 | 2013-04-25 | Led-anordnung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2842388B1 (de) |
DE (1) | DE102012206888A1 (de) |
WO (1) | WO2013160400A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202013101793U1 (de) * | 2013-04-25 | 2014-07-29 | Zumtobel Lighting Gmbh | LED-Schaltungsanordnung |
FR3062269B1 (fr) * | 2017-01-26 | 2020-12-25 | Valeo Vision | Alimentation d'un module lumineux a plusieurs oleds |
WO2019034547A1 (en) * | 2017-08-18 | 2019-02-21 | Signify Holding B.V. | LED LIGHTING MODULE |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3146328A1 (de) * | 1981-11-23 | 1983-06-01 | Siemens AG, 1000 Berlin und 8000 München | Leuchtdiodenvorrichtung mit schutzeinrichtung zur begrenzung des durchlassstroms |
DE19943345A1 (de) * | 1999-09-10 | 2001-03-15 | Hella Kg Hueck & Co | LED-Leuchte |
TWI235349B (en) * | 2001-11-26 | 2005-07-01 | Osram Opto Semiconductors Gmbh | Circuit-arrangement for an LED-array |
DE10206649A1 (de) * | 2002-02-15 | 2003-08-28 | Garufo Gmbh | Anzeigevorrichtung |
JP2004319583A (ja) * | 2003-04-11 | 2004-11-11 | Toritsu Tsushin Kogyo Kk | Led照明装置 |
CN1816833A (zh) * | 2003-06-30 | 2006-08-09 | 皇家飞利浦电子股份有限公司 | 用于交通灯的单个led驱动器 |
KR101581943B1 (ko) * | 2004-09-13 | 2015-12-31 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 조명장치 |
KR20100005023A (ko) * | 2007-02-15 | 2010-01-13 | 엑셈피디스플레이 주식회사 | Led 디스플레이 패널을 구동하기 위한 장치 |
-
2012
- 2012-04-26 DE DE102012206888A patent/DE102012206888A1/de not_active Withdrawn
-
2013
- 2013-04-25 EP EP13719089.8A patent/EP2842388B1/de not_active Not-in-force
- 2013-04-25 WO PCT/EP2013/058627 patent/WO2013160400A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2013160400A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102012206888A1 (de) | 2013-10-31 |
WO2013160400A1 (de) | 2013-10-31 |
EP2842388B1 (de) | 2017-10-04 |
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