EP3138368A1 - Schaltungsanordnung und verfahren zum betreiben von leds - Google Patents
Schaltungsanordnung und verfahren zum betreiben von ledsInfo
- Publication number
- EP3138368A1 EP3138368A1 EP15721618.5A EP15721618A EP3138368A1 EP 3138368 A1 EP3138368 A1 EP 3138368A1 EP 15721618 A EP15721618 A EP 15721618A EP 3138368 A1 EP3138368 A1 EP 3138368A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- current
- leds
- arrangement
- operating device
- 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
- 238000000034 method Methods 0.000 title claims description 16
- 238000003491 array Methods 0.000 claims description 21
- 230000009979 protective mechanism Effects 0.000 claims description 10
- 230000004224 protection Effects 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 230000000875 corresponding effect Effects 0.000 description 15
- 230000007547 defect Effects 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002277 temperature 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]
- H05B45/10—Controlling the intensity 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]
- H05B45/40—Details of LED load circuits
-
- 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
-
- 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
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
Definitions
- the present invention relates to an arrangement for operating a multiplicity of LEDs, which are arranged in LED circuits to be operated with constant current, preferably connected in the context of several so-called series-parallel arrays. Furthermore, the invention relates to a method for operating LEDs. LEDs are replacing more and more classic light sources in modern lighting technology. There are a wide variety of LED types available, which differ in terms of their performance and in terms of color or color temperature of the emitted light. Depending on the field of application of a luminaire in which the LEDs are used, suitably suitable LEDs are used.
- high-power LEDs are used, but instead medium or low power LEDs are used, which are interconnected in larger circuit arrangements.
- medium or low power LEDs are used, which are interconnected in larger circuit arrangements.
- such lower power LEDs are significantly cheaper to manufacture, on the other hand, with the help of such
- FIG. 1 thus shows a circuit variant known from the prior art, in which all the LEDs are supplied by a common operating device 200.
- a single LED array 210 consists in each case of a plurality of parallel-connected LED strands 220, in which in turn in each case a plurality of LEDs 225 in series
- a plurality of such LED arrays 210 can also be connected in series with each other and then in turn in parallel, wherein the operating device 200 then supplies the resulting overall arrangement with a correspondingly suitable constant current IBALLAST.
- IBALLAST constant current
- a corresponding use of LEDs in the illustrated series-parallel arrays is characterized by the relatively simple construction, the associated low costs and the high efficiency that can nevertheless be achieved thereby.
- the circuit arrangement shown in FIG. 1 and known from the prior art can be modified in many different ways. In particular, the number of LEDs used within a single array and the type of LEDs can be changed. Furthermore, the number of LED arrays can be varied and it can be varied how many of these arrays are connected in series and how many of the resultant LED array strands are in turn arranged in parallel. Depending on the design of the
- Circuitry must then provide the operating device 200 a suitable power.
- the circuit arrangement must therefore be designed such that it is ensured that a suitable current for the LEDs is actually provided by the operating device.
- the following procedures for solving this problem are already known from the prior art.
- the operating device can already be appropriately parameterized during manufacture or during startup, so that it permanently outputs the appropriate current given at the beginning. However, this then means that an adaptation of the current to changing conditions during the later operation is not possible.
- Resistor to adjust the amount of output power accordingly.
- Resistance can only be done with a relatively low accuracy. Further In this case, only a single LED array can be identified by the operating device and this must assume that the circuit arrangement has a total of completely identical arrays. In particular, however, can not be seen by the operating device, how many LED arrays are available in total and in what way these are interconnected.
- each LED module with a memory element in which information regarding the required supply current is stored digitally. The operating device must then read this memory and adjust the output current based on it.
- Operating device usually identifies only a single LED module and in turn is not aware of how many LED arrays are interconnected. Incidentally, the above-described problems also arise when the LEDs are connected in a different way than in the parallel-serial arrays shown. Also in this case, it must be ensured that the LEDs are supplied with a suitable current.
- the present invention is therefore based on the task, a
- the solution according to the invention is based on the idea of assigning an identification element in the form of a so-called current sink to an arrangement of LEDs. This is connected separately from the actual power supply circuit via a parallel so-called feedback circuit with the operating device, so that the operating device can determine the resulting due to the current sink current flow in the feedback circuit. This current flow in turn characterizes the LED arrangement such that the operating device is enabled to provide a suitable
- the invention therefore proposes a circuit arrangement for operating LEDs with at least one - preferably series-parallel LED array and an operating device for providing a supply current for the LEDs, wherein the LED array is associated with an identification element in the form of a current sink, which via a Feedback circuit is connected to the operating device, and wherein the operating device is adapted to provide a suitable supply current for the LEDs based on a resulting from the feedback circuit current flow.
- Identification element assigned in the form of a current sink and a
- each LED arrangement is a corresponding identification element in the form of a
- the current sinks that is to say the identification elements, not only make it possible to draw conclusions about the required current but also about the required voltage for operating the LEDs.
- each current sink additionally causes a fixed predetermined voltage drop in the feedback circuit. Is this caused by the current sink voltage drop the
- the voltage drop caused by the current sink corresponds to a predetermined integer fraction of the required forward voltage of the LED arrangement. In the event that this gain factor is known to the operating device, then this in turn can provide a suitable supply voltage available. However, it is not possible to deduce the number of LED arrangements connected in series directly here.
- Another development of the invention relates to protection measures by which defects of individual LEDs are taken into account in the circuit arrangement. From the prior art, different variants are known to respond to corresponding LED defects. This is necessary because defective LEDs can lead to a strong imbalance in the distribution of the current within the circuitry, which can then propagate the imbalance such that further LEDs are damaged. Various protective mechanisms are therefore known which, upon detection of corresponding defects, either interrupt the current flow through the associated LED arrangement or bridge it.
- Feedback circuit automatically adapts to the changed required supply current, if required by protective measures.
- the operation of the LEDs as a whole is thereby additionally optimized.
- Figure 1 is a known from the prior art circuit arrangement of a plurality of interconnected parallel-serial LED arrays
- FIG. 2 shows the embodiment according to the invention of a single LED array
- Figure 3 is a total of the invention resulting circuitry for operating a plurality of LEDs
- Figure 4 shows a first advantageous embodiment of the inventive concept
- Figure 5 shows a second advantageous embodiment of the invention
- FIG. 7 shows a second possibility for the embodiment of the invention
- Figure 8 shows a way to further improve the current sink, in the
- FIG. 2 shows a first embodiment of a generally provided with the reference numeral 10 LED module, which is designed in accordance with the invention.
- the LED module 10 initially contains a series-parallel LED array 15, which is formed from a plurality of LED strands 16 connected in parallel with one another.
- each LED string 16 a plurality of LEDs 17 are connected in series with one another, ideally the number of LEDs 17 in the strands 16 being identical.
- the LED module 10 has at the input and the output of the LED array 15 terminals LED + and LED-, which connects to a Supply circuit, which leads to an operating device for powering the LEDs allow.
- the invention is described with reference to serial-parallel LED arrays, which - as mentioned - represent a particularly advantageous circuit variant for operating LEDs.
- the concept according to the invention can be used much more generally and can also be used in LED arrangements in which the LEDs are otherwise connected.
- the module 10 requires a certain constant supply current I M O D U LE and a suitable supply voltage.
- the LED module 10 itself allows the operating device to determine the level of the required current.
- the LED module 10 has an identification element in the form of a so-called current sink 20, which is connected to the operating device via a so-called feedback circuit.
- the LED module 10 has two further connections FB + and FB-, which are separated from the terminals for the
- Power supply circuit LED + and LED- are formed on. That is, the
- Feedback circuit is basically separate but - as described in more detail below - executed parallel to the power supply circuit.
- the current sink 20 is now designed such that it specifically causes a defined current flow IS ET in the feedback circuit, wherein ideally the following relationship exists:
- I M O D U LE denotes the current required by the LED array 15 while IS ET denotes the current flow caused by the current sink 20.
- the proportionality factor Fe must be known to the operating device, so that this after evaluating the resulting by the feedback loop
- the gain factor F c could be 100, so that at a current level of 3mA caused by the current sink, the driver supplies a supply current to the LEDs of 300mA
- the inventive concept brings advantages in particular when the overall arrangement not only has an LED array as shown in FIG. 2, but consists of a plurality of LED arrays, as shown by way of example in FIG.
- each LED module 10 has the invention
- identifying current sink 20 which are now interconnected in a feedback circuit 25, which also leads to the operating device 50 and is here connected to an internal control unit 51.
- the feedback circuit 25 is formed separately from the power supply circuit 5, it is executed in parallel or in an identical manner with respect to its structure. That is, the individual current sinks 20 of the LED modules 10 are connected to each other in the same way as is the case for the LED arrays 15. This automatically results in a corresponding total current I FEEDB AC K in the feedback circuit 25 which, in turn, corresponds to the total current required by the LED arrangement via the known proportionality factor Fe and is then output by the operating device 50 in a corresponding manner.
- the modules themselves may even each require different supply currents, since this effect automatically also - if the above relationship applies, according to the current flow caused by the current sink is a predetermined fraction of the required current - on the in the feedback loop resulting current flow.
- the modules are as similar as possible or even identical, since this usually results in advantages in terms of a uniform light output.
- the concept can also be used to adapt the voltage output by the operating device in a corresponding manner or to identify the number of LED modules 10 connected in series.
- the current sink 20 causes a specific voltage drop VS INK (see FIG. 2), which is fixed and known to the operating device 50. Out of the total resulting
- the voltage drop VS INK could also represent a fraction of the voltage V LED dropping across the LED array (see FIG. 2). That means it applies
- the operating device 50 can automatically reset the total required
- FIG. 4 shows a first protective mechanism 30 which has a switching element 31 which interrupts the current flow through the entire array 15 in certain situations. This can be the case, for example, if the result is an excessively high current flow due to individual defective LEDs, which possibly leads to another one Damage to all LEDs can cause. As already mentioned are such
- the interruption of the current flow through the array 15 of course then also affects the height of the total required by the LED array current.
- the current sink 20 of the LED module 10 is treated in the same way by the protective mechanism 30. That is, in the feedback circuit of the current sink 20 is assigned a switch 32, of the
- FIG. 5 shows an alternative protection mechanism 40 which, in the event of a problem being detected by means of a switch 41, shorts or bridges the LED array 15. Also in this case, an identical treatment of the current sink 20 is provided. That is, the feedback circuit has now parallel to the current sink 20, a switch 42 which is the same as the switch 41 is driven by the protective mechanism 40.
- FIGS. 6 to 8 show three possibilities for configuring the current sink which according to the invention is used to identify the LED array. In this context, however, it should be noted that
- a very simple embodiment is formed by two transistors Qi and Q 2 and two resistors Ri and R 2 , in which the transistor Q1 causes a predetermined current flow due to the illustrated interconnection.
- this current sink is a suitable
- Preload V BI AS is required, which can be obtained, for example, that the corresponding terminal to the positive input of the supply circuit for the LED module is connected.
- the current sink works so only when the LEDs of the associated LED array are actually supplied with power.
- the total resulting voltage drop VS INK can be increased, for example, the
- FIG. An alternative possibility for designing a current sink is shown in FIG. Again, this is based on the realization or interconnection of two transistors Qi and Q 2 and two resistors Ri and R 2 , but now with the help of additional components, in particular the other transistors Q 3 and Q 4 and the resistor R 3, the current sink in the position is added to independently create a corresponding bias.
- the current sink must actually be connected exclusively to the terminals of the feedback circuit FB + and FB- and a coupling with the power supply circuit for the LEDs is not required.
- a higher voltage VS INK is required, which can optionally be obtained again with the aid of the zener diode D z .
- FIG. A temperature-dependent resistor R TH which is part of a corresponding resistor network with the resistors R B AS E , Rp and Rs, serves to compensate for thermal fluctuations of the base-emitter voltage. This ensures that the supply current remains constant even at higher temperatures.
- FIGS. 6 to 8 represent only conceivable variants for realizing a current sink. Of course, these could also be formed elsewhere.
- the corresponding operating device is enabled to automatically adjust the supply current to the corresponding needs of the circuit.
- failures or bypasses of individual LED arrangements due to defects are automatically taken into account, but also the replacement or replacement of an LED module with a new one, which places different demands on the supply current, is automatically taken into account.
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 |
---|---|---|---|
DE102014208190.4A DE102014208190A1 (de) | 2014-04-30 | 2014-04-30 | Schaltungsanordnung und Verfahren zum Betreiben von LEDs |
PCT/EP2015/059197 WO2015165898A1 (de) | 2014-04-30 | 2015-04-28 | Schaltungsanordnung und verfahren zum betreiben von leds |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3138368A1 true EP3138368A1 (de) | 2017-03-08 |
EP3138368B1 EP3138368B1 (de) | 2020-06-10 |
Family
ID=53174995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15721618.5A Active EP3138368B1 (de) | 2014-04-30 | 2015-04-28 | Schaltungsanordnung und verfahren zum betreiben von leds |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3138368B1 (de) |
AT (1) | AT15510U1 (de) |
DE (1) | DE102014208190A1 (de) |
WO (1) | WO2015165898A1 (de) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7301447B2 (en) * | 2005-04-13 | 2007-11-27 | Gm Global Technology Operations, Inc. | LED turn signal and error detecting method |
ATE530383T1 (de) * | 2008-07-22 | 2011-11-15 | Iveco Magirus | Schaltung zur prüfung des vorhandenseins eines an eine zugmaschine angekoppelten anhängers mittels prüfung des elektrischen stromflusses in den rückwärtigen led-leuchten des anhängers |
KR20100002533U (ko) * | 2008-08-29 | 2010-03-10 | 박영범 | 자동차 엘이디 램프 전원 제어 장치 |
CN101483953B (zh) * | 2009-02-10 | 2012-05-23 | 黄华南 | 照明用发光二极管电流自动辨识方法 |
DE202010003913U1 (de) * | 2010-03-20 | 2010-07-15 | Schott Ag | LED-Lichtquellenanordnung |
US9041294B2 (en) * | 2010-09-27 | 2015-05-26 | Semiconductor Components Industries, Llc | Semiconductor component and method |
DE102011087658A1 (de) * | 2011-12-02 | 2013-06-06 | Osram Gmbh | Parallel geschaltete Leuchtketten |
US9480108B2 (en) * | 2012-04-18 | 2016-10-25 | Axlen, Inc. | Solid-state light source |
US9215768B2 (en) * | 2012-06-14 | 2015-12-15 | Koninklijke Philips N.V. | Self-adjusting lighting driver for driving lighting sources and lighting unit including self-adjusting lighting driver |
DE102012224349A1 (de) * | 2012-06-25 | 2014-01-02 | Osram Gmbh | Beleuchtungsanlage mit einer Schnittstelle aufweisend ein Netzgerät und mindestens ein Lichtquellenmodul |
-
2014
- 2014-04-30 DE DE102014208190.4A patent/DE102014208190A1/de not_active Withdrawn
- 2014-05-28 AT ATGM233/2014U patent/AT15510U1/de not_active IP Right Cessation
-
2015
- 2015-04-28 WO PCT/EP2015/059197 patent/WO2015165898A1/de active Application Filing
- 2015-04-28 EP EP15721618.5A patent/EP3138368B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
DE102014208190A1 (de) | 2015-11-05 |
AT15510U1 (de) | 2017-11-15 |
EP3138368B1 (de) | 2020-06-10 |
WO2015165898A1 (de) | 2015-11-05 |
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