EP2989858A2 - Led-schaltungsanordnung - Google Patents
Led-schaltungsanordnungInfo
- Publication number
- EP2989858A2 EP2989858A2 EP14721283.1A EP14721283A EP2989858A2 EP 2989858 A2 EP2989858 A2 EP 2989858A2 EP 14721283 A EP14721283 A EP 14721283A EP 2989858 A2 EP2989858 A2 EP 2989858A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- leds
- circuit arrangement
- current
- led circuit
- 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
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
Definitions
- the present invention relates to an LED circuit arrangement for operating a plurality of LEDs by a common operating device. Furthermore, the invention relates to a circuit board for mounting with LEDs, by which a corresponding LED circuit arrangement can be realized.
- LEDs are replacing more and more classic light sources in modern lighting technology. There are a variety of different LED types available, which differ in terms of their performance and in terms of the emitted light or the color or color temperature. Depending on the field of application of a luminaire in which the LEDs are used, that is, for example, depending on the size of the luminaire, its light exit surface, the optical system used and the like, the use of a few so-called. High-performance LEDs or a plurality of LEDs with low or medium power of advantage.
- n parallel LED strands each of which has m LEDs, so that an array 310 consists altogether of n ⁇ m LEDs.
- a plurality of arrays 310 can also be connected in series with each other, wherein the operating device 300 then preferably supplies this arrangement with a constant current.
- a serial-parallel LED array as shown in Figures 1 and 2, has certain advantages in terms of ease of construction, the associated low cost, and the high efficiency achievable anyway.
- identical LEDs which have a substantially identical forward voltage, then the current provided by the operating device 300 becomes evenly distributed to the individual LED strands with only small tolerances. The following relationship applies:
- Ibranch corresponds here to the power within a single LED strand, while on the other hand I ba ii ast put to the available by the operating unit 300
- Constant current corresponds.
- V f array corresponds to the forward voltage of the LEDs
- total power of the array is determined as follows:
- FIGS. 1 and 2 has advantages with regard to the simple structure and the high efficiency that can nevertheless be achieved.
- the disadvantage is that due to the even distribution of the current to all LED strings all LEDs are operated in the same way, ie have an identical brightness.
- a typical scenario is, for example, that with the help of the LEDs a luminaire is to be realized, which provides both direct lighting and indirect lighting.
- Direct lighting used here is typically about 80% of the total light output of the lamp while on the other hand for the indirect light only about 20%) are used.
- identical LEDs operate at identical power, this means that far fewer LEDs can be used for indirect light output, but this could potentially be problematic in terms of uniform light output.
- the present invention is therefore based on the object to provide a novel solution for operating LEDs, which makes it possible, despite supplying all the LEDs by a single operating device, the LEDs
- the LED circuit arrangement has a plurality of LED strands connected in parallel, which are provided for supply by a common operating device, ie have a common input terminal and a common output terminal.
- a common operating device ie have a common input terminal and a common output terminal.
- one element for limiting the current is arranged in a subset of the LED strings, wherein this subset comprises at least one LED string.
- This first solution according to the invention thus provides that selective current limiters are arranged in selected LED strings of the array. These each limit the current in the corresponding LED string to a desired value, which is lower in particular than the current that would be present in the event that all the LEDs are conventionally interconnected in the sense of a serial-parallel array.
- the power of the associated LEDs can therefore be set to a specific value for the corresponding LED string, with the possibility of selecting different current values for individual strings.
- the remaining current is then split between the non-current limited LED strings and these are operated at the highest power.
- the current limiting element used according to the invention can be formed by a resistor.
- This somewhat more complex variant has the advantage that a more exact adjustment of the current flowing through the associated LED string is possible here.
- the current limiter since the current limiter usually consumes a certain amount of power, a somewhat smaller number of LEDs is usually present in those strings which are current-limited than in the non-limited LED strings.
- one or more LED strands branch in sections into a larger number of parallel LED strands.
- a sub-array is integrated or embedded in the general LED array, so to speak, which leads to a
- Branching of the strands is such that regardless of which path the current from the input point of the LED circuit arrangement to the end point of the circuit runs, always an identical number of LEDs is traversed. In this way, it is possible to reduce the current flow through individual LED subgroups of the circuit arrangement to rational fractions of the original current flow, which in turn makes it possible to operate LEDs within a common circuit arrangement despite being supplied by a common operating device with different power.
- Compared to the first described variant with the current limiters although there is a slightly lower degree of freedom in the adjustment of the current flow, an advantage exists however in that in the ideal case additional power consuming
- Subsections compensation resistors can be arranged to
- Figure 1 shows a LED circuit arrangement according to the prior art, in which a plurality of series-parallel LED arrays connected in series and are supplied by a common operating device;
- Figure 2 shows the view of a single LED array according to the state of
- FIG 3 is a basic representation of the first inventive concept for
- FIG. 4 shows a variant for the design of a current limiter used in the first idea of the invention
- Figure 5 is a diagram for illustrating the second invention
- FIG. 6 shows an alternative arrangement of compensation resistors in FIG.
- FIG. 3 clarifies the idea underlying the first variant according to the invention. Shown here is a circuit arrangement 1 for operating a plurality of LEDs 2, wherein in the following, for the sake of simplicity, it is assumed that they are each identical LEDs. Possibly. can, however, in
- the circuit arrangement 1 consists of a generally designated by the reference numeral 10 LED matrix or an LED array, which is supplied by a common operating device 3 with constant current I ba ii branch .
- the basic structure of the circuit arrangement corresponds to a series-parallel LED array, ie, there are a plurality of parallel LED strands 11 are provided (in the following case, n LED strands), in each of which a plurality of LEDs 2 are connected in series.
- n LED strands in each of which a plurality of LEDs 2 are connected in series.
- the strands 1 1 arranged in the illustration at the upper end of the array 10 which are not current-limited, each contain m LEDs.
- current limiters 15 are arranged in a few selected LED strings of the array 10. These can be realized in different ways, as will be described in more detail later. Their function is to limit the current flow to a specific value in the respective LED string. In this case, the current limiters 15 are designed in such a way that they can individually adjust the current for the corresponding string 11 in each case.
- a necessary prerequisite is, of course, that the sum of all currents set by the current limiter 15 is lower than the total current provided by the operating device 3 Ibaiiast, ie ⁇ ⁇ limited ballast
- VF_ arra y m * Vf LED
- Voltage drop Vdrop limiter k min is that of the current limiter in the
- the current limiter 15 can be adjusted individually by the current limiter 15.
- the simplest way of realizing the embodiment according to the invention is that, as shown in FIG. 3, the current limiters 15 are each realized by resistors Ri to R j . Since the forward voltage across the LEDs 2 varies only very slightly with the current flow, corresponding lead
- Resistors connected in series with the LEDs 2 of the corresponding string cause the current to be set almost constant to a desired value.
- the forward voltage of the LEDs 2 may be unacceptable with regard to the respective field of application and outside a certain tolerance limit, since the forward voltage of the LEDs 2 to a certain extent depends on the operating parameters such as current or temperature. Also inherent intolerances in the manufacturing process of LEDs lead here to a certain fluctuation in the current flow.
- a current limiter corresponding to the representation of FIG. 4 can also be realized.
- This consists in this case of two transistors and two resistors, which are connected to a so-called. Constant current sink.
- the transistor Q2 in this case drives the transistor Ql to force a constant current flow across the LED string 11 2 .
- the value of the set current is determined by the resistor Rl, the resistor R2 is the
- Bias of the transistor Ql As an alternative to the illustrated embodiment, an n-channel MOSFET transistor could be used instead of the illustrated bipolar transistor Q1, the transistor Q2 could in turn be replaced by two diodes. Furthermore, using the principle according to the invention, further variants for realizing a current limiter would be conceivable in which the current flow no longer depends on the supply voltage of the LEDs and, accordingly, can be set exactly to a desired value.
- FIG. 5 shows the fundamental principle on which the invention is based, again based on a classic serial-parallel LED array which is shown in the upper area of FIG. 5 and has k parallel LED strands 11 with m LEDs 2 in each case.
- the second principle of the invention now provides that at least part of the original LED strands 11 branches in sections into a different number of parallel LED strands 21. This results in a new serial-parallel LED array 20, which, so to speak, integrated into the original array 10 or
- sub-array 20 is embedded and hereinafter also referred to as a sub-array. This concept can be seen in the lower half of Figure 5, in which case the k input-side LED strands 11 branch in its central region in i series-parallel LED strands 21, so that here the above-mentioned sub-array 20 is formed ,
- the number of branched strands i is greater than the original number k, the number j of the serial LEDs located in the branched strands 21 being identical in each case, irrespective of the degree of branching and corresponding to the corresponding original number.
- the entire LED array according to the invention passes from the input point 5 to the starting point 6, there are always identical numbers of LEDs on this path, in the illustrated exemplary embodiment a total of m LEDs.
- the number of LEDs in series is thus always constant regardless of the corresponding path.
- Inested branch Ibranch 'k / ⁇
- Ibranch refers to the flow of electricity before the branch.
- the prerequisite for this is that - as already mentioned - the number of branched strands i is greater than the number of original strands k, ie i> k must be and the sub-array 20 extends only over a subsection of the entire arrangement, ie 1 ⁇ j ⁇ m.
- the total current flow in the LED strands before they branch, is thus divided almost equally to the branched strands after the branching point 7.
- the current flow through the newly integrated sub-array 20 can be reduced to a different current value than in the non-branched regions or unbranched LED strands, by adjusting the ratio of the number of strands before and after branching Ratio of Current values can be adjusted. In the areas adjoining the sub-array 20, the current flow then returns to the original value.
- the forward voltage of an LED is known to depend on the magnitude of the corresponding current flow through it, with the forward voltage increasing with increasing current flow. Furthermore, there is also a temperature dependence, wherein an increase in the temperature in turn leads to a reduction of the
- TLED OSP represents the temperature of the LEDs in front of the branch point 7 and after the merge point 8 while T L ED BSP describes the temperature of the LEDs after the branch point or in the sub-array 20.
- Compensating resistors are used, in particular if not all strands of the original LED array have been branched in the same way. These resistors 25 are dimensioned such that they compensate for the difference in the forward voltage in the region of the sub-array 20.
- a first possibility for the arrangement of the compensation resistors 25 mentioned is to arrange them according to the representation of FIG. 5 in the region in front of the branch. For the height of the compensation resistors 25 then the following relationship applies:
- Rcomp j '(Vf LED (Ibranch, TLED OSP) _ Vf LED (branch Inested, TLED BSP)) Ibranch
- the arrangement of the compensating resistors 25 can take place either before the
- V f LED Ibranch, TLED OSP
- Vf LED Inested branch, TLED BSP
- Rcomp j- (Vf_LED (Inested_branch, TLED BSP) _ Vf_LED (Ibranch, TLED OSP)) Ibranch
- FIGS. 8a to 8e show some conceivable possibilities for
- LED strings can also be brought together (see FIG. 8c), which corresponds to an inverse branch, but has no influence on the effect of the different current supply according to the invention.
- the resulting current flows esp.
- the idea of branching so there is the possibility of the flow of current decrease a value that corresponds to a rational fraction of the original stream value in a straight-line section.
- Circuit arrangements the ability to operate LEDs despite common power supply with different powers. This then opens the possibility to the LEDs, each with different power to different tasks
- those LEDs that operate at reduced power could be used to provide indirect lighting and / or accent lighting while the maximum power LEDs would be used for direct lighting. In this context is on it
- Circuit arrangement does not say anything about their position, for example within a luminaire.
- those LEDs which are operated with a different current, that is to say a different power, despite the fact that they are part of a common circuit arrangement, can be placed in the luminaire such that e.g. their light output is opposite to the light output of the other LEDs.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202013101793.0U DE202013101793U1 (de) | 2013-04-25 | 2013-04-25 | LED-Schaltungsanordnung |
| PCT/EP2014/058104 WO2014173879A2 (de) | 2013-04-25 | 2014-04-22 | Led-schaltungsanordnung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2989858A2 true EP2989858A2 (de) | 2016-03-02 |
| EP2989858B1 EP2989858B1 (de) | 2021-03-10 |
Family
ID=50639466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14721283.1A Active EP2989858B1 (de) | 2013-04-25 | 2014-04-22 | Led-schaltungsanordnung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2989858B1 (de) |
| DE (1) | DE202013101793U1 (de) |
| WO (1) | WO2014173879A2 (de) |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2707223B1 (fr) * | 1993-07-07 | 1995-09-29 | Valeo Vision | Feu de signalisation perfectionné à diodes électroluminescentes. |
| ES2173429T3 (es) * | 1996-11-12 | 2002-10-16 | L F D Ltd | Lampara |
| TWI479466B (zh) * | 2005-05-25 | 2015-04-01 | Koninkl Philips Electronics Nv | 通量補償發光二極體驅動系統及方法 |
| JP2008130377A (ja) * | 2006-11-21 | 2008-06-05 | Matsushita Electric Works Ltd | Led点灯回路およびそれを用いる照明器具 |
| US8106604B2 (en) * | 2008-03-12 | 2012-01-31 | Freescale Semiconductor, Inc. | LED driver with dynamic power management |
| US8035307B2 (en) * | 2008-11-03 | 2011-10-11 | Gt Biomescilt Light Limited | AC to DC LED illumination devices, systems and methods |
| US8044609B2 (en) * | 2008-12-31 | 2011-10-25 | 02Micro Inc | Circuits and methods for controlling LCD backlights |
| KR100930813B1 (ko) * | 2009-03-09 | 2009-12-09 | 이동원 | 능동형 정전력 공급장치 |
| TW201107916A (en) * | 2009-08-24 | 2011-03-01 | Novatek Microelectronics Corp | Light emitting device capable of dynamically regulating output voltage and related control method |
| US8084960B2 (en) * | 2009-12-30 | 2011-12-27 | O2Micro, Inc | Circuits and methods for powering light source with balanced currents |
| CN102264173B (zh) * | 2010-05-31 | 2013-11-06 | 英飞特电子(杭州)股份有限公司 | Led恒流驱动电路及输出电压可调电路 |
| US8766546B2 (en) * | 2011-06-06 | 2014-07-01 | Tdk-Lambda Corporation | LED drive device and LED illuminating device |
| US8710754B2 (en) * | 2011-09-12 | 2014-04-29 | Juno Manufacturing Llc | Dimmable LED light fixture having adjustable color temperature |
| TW201347600A (zh) * | 2012-01-26 | 2013-11-16 | 維薩達爾電子股份有限公司 | 發光二極體應用積體電路元件及電子電路 |
| US8878443B2 (en) * | 2012-04-11 | 2014-11-04 | Osram Sylvania Inc. | Color correlated temperature correction for LED strings |
| DE102012206888A1 (de) * | 2012-04-26 | 2013-10-31 | Zumtobel Lighting Gmbh | LED-Anordnung |
-
2013
- 2013-04-25 DE DE202013101793.0U patent/DE202013101793U1/de not_active Expired - Lifetime
-
2014
- 2014-04-22 EP EP14721283.1A patent/EP2989858B1/de active Active
- 2014-04-22 WO PCT/EP2014/058104 patent/WO2014173879A2/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014173879A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2989858B1 (de) | 2021-03-10 |
| DE202013101793U1 (de) | 2014-07-29 |
| WO2014173879A3 (de) | 2015-04-09 |
| WO2014173879A2 (de) | 2014-10-30 |
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