EP3935920A1 - Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur reduzierung des strommaximums in einem leuchtdiodenfeld - Google Patents
Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur reduzierung des strommaximums in einem leuchtdiodenfeldInfo
- Publication number
- EP3935920A1 EP3935920A1 EP20706214.2A EP20706214A EP3935920A1 EP 3935920 A1 EP3935920 A1 EP 3935920A1 EP 20706214 A EP20706214 A EP 20706214A EP 3935920 A1 EP3935920 A1 EP 3935920A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- light
- regulating means
- switch
- emitting diode
- 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.)
- Pending
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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/155—Coordinated control of two or more light sources
-
- 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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
-
- 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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
Definitions
- the invention relates to a control and / or regulating means for controlling and / or regulating a light-emitting diode array with n LEDs, where n> 2, with outputs at which control and / or regulating signals for controlling and / or regulating controllable switching elements can be tapped
- control and / or regulating means switch-on times and / or switch-off times of pulses through the control signals and / or re
- gel signals are definable and one and / or more controllable switching elements can be controlled during the determined pulses for closing or opening.
- a circuit arrangement and a method for operating the circuit arrangement are described.
- Such a light-emitting diode field is located, for example, in newly developed LED headlights with tens of thousands of light-emitting diodes within a light-emitting diode field.
- the invention is based on the object of proposing a control and / or regulating means, a circuit arrangement and a method with which the maximum current consumed by a light-emitting diode array can be reduced.
- Control signals can be defined and one and / or more controllable switching elements can be activated during the determined pulses for closing or opening, whereby a number of k groups can be defined, each LED is assigned to one of the k groups, so that each of the k groups contains m j light-emitting diodes , where 1 £ j £ k and
- a 1 ... a k can be determined and the switch-on and switch-off time of the pulse for each LED one
- each LED is therefore sensible for each LED to be assigned to one of the k groups such that adjacent LEDs are assigned to different groups.
- the LEDs in a group should be distributed in such a way that no LED blocks of neighboring light-emitting diodes are formed within a group.
- the individual LEDs of a light-emitting diode field could be assigned to groups 1, 2 and 3 as follows:
- a meaningful assignment of the individual LEDs of a light-emitting diode field is, for example, the following:
- the objective can be to separate the switch-on times or the switch-off times from one another as far as possible, since a reduction in the maximum current can be achieved by not switching all LEDs on simultaneously or in quick succession.
- k 1: a 1 is freely selectable
- T is a clock period
- LED of a group depending on a can be calculated according to the formula:
- the switch-on time and the switch-off time of the pulses for each light-emitting diode in a group can be calculated for all desired forms of implementation using the formulas given.
- k Since the number of k groups to be formed is limited by the technical possibilities, k should be chosen according to the principle “as large as necessary, as small as possible”.
- a mean value M PW of the pulse widths PW i can be calculated according to the formula
- a number of k groups can be determined according to the formula
- each LED is assigned to one of the k groups.
- control and / or regulating means can be set up in such a way that results of simulations are stored in order to determine the optimal number of k.
- the method for setting up the control and / or regulating means has at least the following steps:
- the pulses of the individual LEDs in a group for the required brightness distribution are determined using the simulation,
- a current distribution in the LED field is simulated based on the impulses, - an optimal number of k groups is determined based on the power distribution,
- the information determined on the basis of the simulation is transferred to the control and / or regulating means.
- the invention also relates to a circuit arrangement for controlling and / or regulating a light-emitting diode field.
- the circuit arrangement according to the invention has a control and / or regulating means according to claims 1 to 7, a power source for each LED and a light-emitting diode field, the light-emitting diode field comprising at least two series circuits each comprising at least one light-emitting diode and a controllable switching element , wherein a control connection of each controllable switching element is connected to an output of the control and / or regulating means.
- the method for operating a circuit arrangement according to the invention has at least the following steps:
- k groups are determined by the control and / or regulating means or transferred to the control and / or regulating means or determined randomly,
- each LED is assigned to a group
- the control and / or regulating means (1) controls the controllable switching elements for the determined switch-on time and the determined switch-off time of the pulse for each light-emitting diode of each group
- the method for operating a second variant of the circuit arrangement also has at least the following steps:
- each LED is assigned to one of the k groups.
- the advantage of the present invention is that with an increasing number of groups, the maximum of the current within a light-emitting diode field is significantly reduced and becomes more continuous.
- the present invention also provides a possibility of achieving a sensible effort / benefit balance.
- FIG. 1 block diagram of a circuit arrangement according to the invention for
- 2a, 2b are flow diagrams to illustrate the determination of the reference times and the switch-on and switch-off times
- Fig. 4 simulated current distribution with a different number of
- Groups for a real brightness distribution 1 shows a block diagram of a circuit arrangement 5 according to the invention for controlling and / or regulating a light-emitting diode array 2.
- the circuit arrangement 5 according to the invention can be implemented, for example, by an integrated circuit, in particular a commodity chip or an ASIC. Other designs of the circuit arrangement 5 are entirely conceivable.
- the light-emitting diode field 2 is assumed here as a matrix LED system, as it is used in newly developed headlights of motor vehicles.
- the individual light-emitting diodes LED 11 , LED 12 , ... are arranged in rows and columns to one another.
- the invention is not limited to light-emitting diode arrays with light-emitting diodes arranged in rows and columns.
- the light-emitting diode field 2 has a different arrangement of the light-emitting diodes LED 11 , LED 12 ,...
- LED systems with 15,000-25,000 light-emitting diodes LED 11 , LED 12 , ... are used.
- the individual LEDs can be operated via a controllable switching element 4 which is activated for opening or closing.
- the brightness of the individual light-emitting diodes LED 11 , LED 12 ,... Is set over the duration of the closed controllable switching element 4.
- the required brightness of the individual light-emitting diodes LED 11 , LED 12 , ... can be determined on the basis of image data that can be transferred from a control device 8 to the control and / or regulating means 1.
- control and / or regulating means 1 It is also conceivable that the required brightness values are transferred directly to the control and / or regulating means 1.
- the controllable switching elements 4 are switched on and off at such a high frequency that it cannot be seen by the human eye.
- the circuit arrangement 5 comprises at least one current source 6.
- the current source 6 is a controllable current source 6.
- Light-emitting diode LED 11 , LED 12 , ... in the light-emitting diode field 2 has a current source 6 and a controllable switching element 4. Such a design is possible, for example, with the novel LED headlights mentioned at the beginning.
- control and / or regulating means 1 in a circuit arrangement 5 according to the invention, at least one control and / or regulating means 1 according to the invention is provided.
- the control and / or regulating means 1 is connected to the controllable current source 6 and the controllable switching elements 4 of the light-emitting diode array 1 via these outputs 3.
- the control and / or regulating means can also have at least one input 9.
- Image data for determining the required brightness, for example, can be transferred via this input.
- the control and / or regulating means 1 according to the invention is set up in such a way that the process steps required to achieve a desired brightness distribution of the light-emitting diodes LED 11 , LED 12 ,... Of the light-emitting diode field 2 can be run through autonomously.
- control and / or regulating means 1 this is achieved by first defining a number of k groups and assigning each LED to one of the k groups.
- the number of necessary groups can be determined on the one hand by a calculation within the control and / or regulating means 1 during operation.
- k 1: a 1 is freely selectable
- T is a clock period
- a formula is used in unit 7 to calculate the switch-on time and the switch-off time of the pulse for each LED in a group
- Controlled ble switching elements 4 for closing or opening.
- controllable current source supplies the required current i in order to make the selected light-emitting diode light up and to achieve the required brightness distribution.
- FIG. 2a, 2b show flowcharts for better illustration of the determination of the reference times and the switch-on and switch-off times.
- Fig. 2a shows an outer loop and
- Fig. 2b shows an inner loop.
- the number of k groups is determined according to one of the variants described in FIG. 1 and each light-emitting diode is assigned to a group, so that each group contains m j light-emitting diodes. This information is fed into the system in a suitable manner.
- the flowchart begins in an outer loop in which the individual groups are worked through one after the other.
- first j: 1 is set, i.e. the first of the k groups is considered.
- the reference time ai for the first group is now established according to one of the methods presented. As already shown, this can happen, for example, randomly, in accordance with a stored table or using the formulas presented.
- the switch-on time and the switch-off time are determined recursively for each assigned light-emitting diode p j of the group considered in this run.
- the value of p j runs through all values until the number of light-emitting diodes in the respective group m j is reached.
- a switch-on time and a switch-off time are determined below for this light-emitting diode.
- the next step is to check whether the value of p j corresponds to the value of m j , ie the inner loop has been processed for all light-emitting diodes in the group under consideration.
- the time in this case a clock period T, is plotted on the x-axis.
- the current of the controllable current source 6 is plotted on the y-axis.
- the present example shows an impulse for each of the 5 groups. This would mean that there would only be one light emitting diode in each group. In practice, a large number of light emitting diodes are assigned to a group. The assumption that a light-emitting diode is assigned to each of the k groups is used exclusively for better clarity in FIG. 3. By determining the reference times according to the invention and calculating the switch-on time and the switch-off time, a uniform distribution of the pulses over a clock period is achieved.
- the aim of the present invention is to reduce the maximum current within the circuit arrangement and to harmonize the current curve.
- FIG. 4 shows a simulated current distribution with a different number of groups for a real brightness distribution.
- the number of k groups is not determined, but a comparison of different numbers is carried out in order to clarify the influence of the number of groups k on the current distribution.
- the switch-on times and the switch-off times are calculated using the formulas described under FIG. 1.
- the simulation involves a real arrangement with several thousand light-emitting diodes, which are assigned to the different groups according to the criteria shown in FIG. 1.
- LED 11 LED 11 , LED 12 , ... light-emitting diodes
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019105954.2A DE102019105954A1 (de) | 2019-03-08 | 2019-03-08 | Steuer- und/oder Regelungsmittel, Schaltungsanordnung und Verfahren zur Reduzierung des Strommaximums in einem Leuchtdiodenfeld |
| PCT/EP2020/054229 WO2020182428A1 (de) | 2019-03-08 | 2020-02-18 | Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur reduzierung des strommaximums in einem leuchtdiodenfeld |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3935920A1 true EP3935920A1 (de) | 2022-01-12 |
Family
ID=69631589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20706214.2A Pending EP3935920A1 (de) | 2019-03-08 | 2020-02-18 | Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur reduzierung des strommaximums in einem leuchtdiodenfeld |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11723132B2 (de) |
| EP (1) | EP3935920A1 (de) |
| CN (1) | CN113557794B (de) |
| DE (1) | DE102019105954A1 (de) |
| WO (1) | WO2020182428A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019105953A1 (de) * | 2019-03-08 | 2020-09-10 | HELLA GmbH & Co. KGaA | Steuer- und/oder Regelungsmittel, Schaltungsanordnung und Verfahren zur Ansteuerung von Leuchtdioden in einem Leuchtdiodenfeld |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2159842A1 (en) * | 1994-12-05 | 1996-06-06 | Joe A. Ortiz | Diode drive current source |
| CA2972780C (en) | 2005-04-08 | 2020-04-28 | Eldolab Holding B.V. | Methods and apparatuses for operating groups of high-power leds |
| DE102007002809A1 (de) * | 2007-01-18 | 2008-07-24 | Hella Kgaa Hueck & Co. | Verfahren zum gepulsten Betrieb einer Beleuchtungseinrichtung mit Leuchtdioden (LED) für Kraftfahrzeuge |
| TWI459858B (zh) * | 2008-06-24 | 2014-11-01 | Eldolab Holding Bv | 照明系統及發光二極體組件之控制單元 |
| KR101289639B1 (ko) * | 2008-07-04 | 2013-07-30 | 엘지디스플레이 주식회사 | 백라이트 유닛의 광원 구동장치 및 방법 |
| TWI400986B (zh) * | 2009-08-05 | 2013-07-01 | Chunghwa Picture Tubes Ltd | 發光二極體的驅動電路 |
| KR20120084555A (ko) * | 2011-01-20 | 2012-07-30 | 삼성전자주식회사 | 다채널 펄스 폭 변조(pwm) 신호 생성 장치 및 방법, 이를 구비하는 led 시스템 |
| DE102011015282B4 (de) * | 2011-03-28 | 2022-03-10 | Austriamicrosystems Ag | Gesteuerte Versorgungsschaltung |
| ITTV20110065A1 (it) * | 2011-05-13 | 2012-11-14 | Automotive Lighting Italia Spa | Sistema elettronico di controllo configurato in modo da controllare un indicatore di direzione led-array autoveicolistico |
| CN103621181B (zh) * | 2011-06-03 | 2017-02-15 | 欧司朗有限公司 | 驱动led光源的方法和相关装置 |
| US9839083B2 (en) * | 2011-06-03 | 2017-12-05 | Cree, Inc. | Solid state lighting apparatus and circuits including LED segments configured for targeted spectral power distribution and methods of operating the same |
| TWI478620B (zh) * | 2012-12-17 | 2015-03-21 | Power Forest Technology Corp | 發光二極體背光系統及其驅動裝置與驅動方法 |
| KR101664530B1 (ko) * | 2013-01-11 | 2016-10-11 | 단국대학교 산학협력단 | 엘이디의 수명을 연장하는 전력 제어 방법 및 그 장치 |
| AT516294B8 (de) * | 2014-09-22 | 2017-02-15 | Zkw Group Gmbh | Verfahren und Schaltungsanordnung zum Speisen einer Serienschaltung von n LED-Einheiten |
| JP6583775B2 (ja) * | 2015-07-09 | 2019-10-02 | パナソニックIpマネジメント株式会社 | 点灯装置、車両用照明装置、及びそれを用いた車両 |
| US10569701B2 (en) * | 2017-03-31 | 2020-02-25 | Valeo North America, Inc. | Systems and methodologies for controlling a vehicle light |
| WO2020049039A1 (en) * | 2018-09-04 | 2020-03-12 | Osram Gmbh | Circuit assembly and method for operating an led module |
-
2019
- 2019-03-08 DE DE102019105954.2A patent/DE102019105954A1/de not_active Withdrawn
-
2020
- 2020-02-18 US US17/593,038 patent/US11723132B2/en active Active
- 2020-02-18 CN CN202080019208.1A patent/CN113557794B/zh active Active
- 2020-02-18 WO PCT/EP2020/054229 patent/WO2020182428A1/de not_active Ceased
- 2020-02-18 EP EP20706214.2A patent/EP3935920A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020182428A1 (de) | 2020-09-17 |
| CN113557794A (zh) | 2021-10-26 |
| CN113557794B (zh) | 2025-01-07 |
| DE102019105954A1 (de) | 2020-09-10 |
| US11723132B2 (en) | 2023-08-08 |
| US20220174797A1 (en) | 2022-06-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE102011054147B4 (de) | Testvorrichtung und Testverfahren | |
| DE2046543C3 (de) | Einrichtung zum Steuern einer Charakteristik einer Brennkraftmaschine, insbesondre für Kraftfahrzeuge | |
| DE102017120672A1 (de) | Treiben mehrerer Lichtquellen | |
| DE1814940B2 (de) | Lernende klassifizierungsschaltung | |
| DE102010015518A1 (de) | Verfahren zum Steuern einer Beleuchtungseinrichtung in einer Flugzeugkabine | |
| DE102015118497A1 (de) | Beleuchtungsvorrichtung für ein fahrzeug und verfahren zur beleuchtung eines fahrzeugs | |
| DE2210426B1 (de) | Verfahren zur vorranggesteuerten Auswahl einer von mehreren Funktionseinheiten zur Anschaltung an eine ihnen gemeinsam zugeordnete Einrichtung in Datenverarbeitungsanlagen und Schaltung zur Durchführung des Verfahrens | |
| EP3935920A1 (de) | Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur reduzierung des strommaximums in einem leuchtdiodenfeld | |
| DE102018213316A1 (de) | Beleuchtungsvorrichtung | |
| EP0708998A1 (de) | Gepuffertes gleichspannungsversorgungssystem | |
| DE102015121417B4 (de) | Adaptiver DC-DC-Leuchtdiodentreiber für dynamische Lasten | |
| DE102005011503B3 (de) | Verfahren zur gepulsten Ansteuerung von Leuchtmitteln | |
| EP3935921B1 (de) | Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur ansteuerung von leuchtdioden in einem leuchtdiodenfeld | |
| DE102018210097B4 (de) | Schaltungsanordnung zur Bereitstellung einer Mehrzahl von Versorgungsspannungen | |
| DE102010040608B4 (de) | Digitaler Zeitmultiplexenergieregler | |
| DE102004044001A1 (de) | Verfahren zur Steuerung der Energiezufuhr von einer Stromquelle an einen Stromverbraucher | |
| DE102019204136A1 (de) | Verfahren und Vorrichtung für Training und Herstellung eines künstlichen neuronalen Netzes | |
| DE1524897A1 (de) | Schaltung zum Durchschalten und Speichern eines zyklisch auftretenden elektrischen Signals | |
| DE10158939A1 (de) | Verfahren und Vorrichtung zur Steuerung von Betriebsabläufen in einem Fahrzeug | |
| DE102014102872A1 (de) | Schaltungsanordnung zur Regelung eines elektrischen Stroms | |
| DE102008010398A1 (de) | Verfahren zur Ermittlung einer Ansteuerung einer elektrischen Energieversorgung | |
| DE1296852B (de) | Anordnung zur Abgabe von Stellbefehlen in Form von Analoggroessen fuer getrennte Verbraucherkreise | |
| DE932312C (de) | Schaltungsanordnung zur Erzeugung einer Impulsreihe | |
| EP4369865A1 (de) | Leuchtvorrichtung | |
| WO2019057535A1 (de) | Vorrichtung und verfahren zur dynamischen überlastbegrenzung bei farbtemperaturdimmbaren mehrkanal-led-systemen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20211001 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
| 17Q | First examination report despatched |
Effective date: 20230317 |
|
| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: HELLA GMBH & CO. KGAA |