EP3935921A1 - Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur ansteuerung von leuchtdioden in einem leuchtdiodenfeld - Google Patents
Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur ansteuerung von leuchtdioden in einem leuchtdiodenfeldInfo
- Publication number
- EP3935921A1 EP3935921A1 EP20705962.7A EP20705962A EP3935921A1 EP 3935921 A1 EP3935921 A1 EP 3935921A1 EP 20705962 A EP20705962 A EP 20705962A EP 3935921 A1 EP3935921 A1 EP 3935921A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- light
- switch
- regulating means
- pulse
- 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
-
- 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
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- 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
-
- 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]
Definitions
- the invention relates to a control and / or regulating means for controlling and / or regulating a light-emitting diode field, with outputs at which control and / or regulating signals for controlling and / or regulating controllable switching elements can be tapped, with switch-on times and / or switch-off times of Pulses by which control signals and / or regulating signals can be defined and one and / or more controllable switching elements can be activated during the determined pulses for closing or opening.
- a circuit arrangement and a method for operating the circuit arrangement are examples of a controllable switching elements.
- the procedure is such that the light-emitting diodes are switched on at the beginning of a clock period of the PWM cycle and switched off after the switch-on period selected to achieve the desired brightness. Switching on takes place simultaneously for all LEDs, switching off can take place for each LED at a different switch-off time, depending on the pulse width of the pulse.
- Such a light emitting diode field is, for example, in newly developed LED headlights with tens of thousands of light emitting diodes within a light diode field.
- the invention was based on the problem of improving a control and / or regulating means of the type mentioned in such a way that a desired light distribution is achieved and at the same time a reduced dynamic in the total current and peak current is achieved.
- the switch-on times and the switch-off times of the LEDs are selected so that not all LEDs are switched on at the same time at the beginning of the clock period.
- a brightness of each light emitting diode rri j of one of the k groups can be controlled by setting a pulse width of the pulse from 0 ... 100% of a clock period and / or setting an amplitude of the pulse.
- the switch-on time and / or switch-off time of the pulse can be determined for each light-emitting diode rrt j of a group as a function of the pulse width and / or the amplitude of the pulse.
- the determined switch-on times and / o the switch-off times of the pulses lie within a predetermined clock period.
- pulse width 100%
- the switch-on time and the switch-off time for each of these pulses can be set to the beginning or the end of a clock period
- the switch-on time and / or switch-off time of the pulse for each light-emitting diode in each Group can be defined or determined in such a way that the total pulse is in the middle within a clock period.
- the sequential arrangement of the impulses makes it possible to generate a more even demand for electricity.
- the sum pulse is also placed in the middle of a clock period.
- a maximum of the current requirement which cannot always be avoided, is also shifted to the middle of a clock period.
- the resulting waveform of the current means that the high peak currents at the beginning of a clock period, as well as steep current increases in a short time, which can lead to EMC problems, can be avoided. It is possible that the number of groups is 2 ⁇ k ⁇ n and the start of a clock period for each group is offset by a time span
- At k is controllable.
- the time period D ⁇ according to the formula At be determinable.
- the start of the clock period is set for all groups offset by ⁇ clock periods. This means that the power consumption of the entire light-emitting diode field is more uniform. As a result, it may be possible that lower requirements can be placed on the supply of the light-emitting diode field.
- 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 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 assigned to the light-emitting diode, with a Control connection of each controllable switching element is connected to an output of the control and / or regulating means.
- the current source can be regulated by the control and / or regulating means, so that the current corresponds to the current requirement of the light-emitting diodes, whose associated controllable switching elements are closed.
- the light-emitting diode field is divided into 2 ⁇ k ⁇ n groups.
- the division into at least 2 groups makes it possible to offset the beginning of a clock period for each group by a period of time D ⁇ and to use the advantages already described.
- the method for operating a circuit arrangement according to the invention has at least the following steps:
- the switch-on time and the switch-off time for each of these pulses is set to the beginning or the end of a clock period
- control and / or regulating means checks which pulses have a pulse width ⁇ 100%
- control and / or regulating means determines the switch-on time and / or switch-off time of the pulse for each light-emitting diode in each group in such a way that the sum pulse lies centrally within a clock period
- the control and / or regulating means controls the controllable switching elements for the determined switch-on time and / or switch-off time of the pulses for closing or opening.
- the method for operating a circuit arrangement according to the invention which is particularly suitable for performing before performing the method described above, has at least the following steps:
- control or regulating means determines the pulse widths for each light emitting diode in a group or the pulse widths are transferred to the control and / or regulating means
- control and / or regulating means determines the largest pulse width
- the brightness distribution which is usually determined in advance, remains the same with this approach.
- the total current required by the light-emitting diode field can become more uniform over a clock period. It is also possible to reduce the maximum current.
- Fig. 2 flowchart to illustrate the determination of the switch-on times and the switch-off times
- 5a, b a comparison of typical power distribution of a light emitting diode array with three groups without shifting the beginning of a clock period (a) and with shifting the beginning of a clock period (b)
- the circuit arrangement 6 according to the invention shown in FIG. 1 comprises a light-emitting diode array 7 made up of two series circuits 1, 2.
- Each series circuit 1, 2 includes a light-emitting diode 3, a resistor 4 and a controllable switching element 5.
- the first series circuit 1 and the second series circuit 2 are referred to below.
- the series connections 1 2 are connected in parallel.
- the light-emitting diodes 3 are arranged within the series circuits 1, 2 so that their anodes lie against a common node.
- the resistors 4 are arranged between the diodes 3 and the controllable switching elements 5.
- the circuit arrangement 6 according to the invention comprises a current source 8.
- the current source 8 is a controllable current source.
- control and / or regulating means 9 according to the invention is provided in a circuit arrangement 6 according to the invention.
- the control and / or regulating means 9 has several outputs 10.
- the control and / or regulating means 9 is connected to the controllable current source 8 and the controllable switching elements 5 of the light-emitting diode array 7 via these outputs 10.
- First outputs 10 of the control and / or regulating means 9 are connected to Steueranschlüs sen of the controllable switching elements 5 of the series circuits 1 and 2 of the Leuchtdio denfeldes 7. Control pulses can be given to the switching elements 5 via these first outputs 10 in order to close or open them.
- a second output 10 is connected to the controllable current source 8. Via this second output 10, the control and / or regulating means 9 can send a signal to the controllable current source 8 in order to set the current to be supplied by the current source 8.
- the control and / or regulating means 9 is set up in such a way that the light-emitting diodes 3 have a desired brightness.
- controllable switching element 5 assigned to a light-emitting diode 3 is controlled to close within a clock period until the light-emitting diode 3 has produced the desired brightness.
- FIG. 2 shows a flow chart to illustrate the determination of the switch-on times and the switch-off times. As a preparatory measure, all pulse widths are available for the process.
- pulse widths PW ⁇ 100% are available. If the query is answered with "yes", the pulse with the largest pulse width is selected.
- the pulse width is increased to 100% of the clock period.
- the power requirement is then multiplied by the reciprocal of the magnification factor. All other pulse widths are adjusted equally.
- pulse widths PW 100% are available by definition. The flowchart then continues at the point that is activated if the answer to the above query is "no".
- the next smaller pulse is selected.
- the pulse width of this pulse is set as the first sum pulse.
- the remaining area which means the area that is still available when the total pulse is subtracted from the clock period, is then calculated.
- Another query starts, namely whether a pulse is present so that the pulse width PW is smaller than the remaining range.
- the switch-on and switch-off times of the individual pulses of the sum pulse can be specified.
- the procedure here is such that the entire sum pulse is centered within one clock period.
- the pulse is selected and a new sum pulse is calculated as the sum of the old sum pulse plus the pulse width of the selected pulse.
- FIG. 3 shows a typical current profile of a light-emitting diode field controlled according to the invention during a clock period.
- each light emitting diode is controlled individually.
- a desired average brightness of the light-emitting diode can be set by specifically switching the individual light-emitting diodes on and off.
- the light-emitting diode with a desired brightness of 100% is energized for the entire clock period.
- the light-emitting diodes with other desired brightnesses are switched off again after the desired average brightness has been reached before the end of the cycle period.
- FIG. 3 shows a current curve in which the pulses of the individual light-emitting diodes are arranged in time so that the switch-on and switch-off times overlap as little as possible.
- FIG. 3 shows a current distribution during a clock period for 8 light-emitting diodes selected by way of example with the pulse widths shown below.
- the light emitting diodes are operated in such a way that a maximum occurs in the middle of the clock period in order to minimize unwanted current peaks at the beginning of a clock period.
- 3 is based on the following time division of the light-emitting diodes.
- a 1 stands for a closed controllable switching element, so that the selected light-emitting diode is energized and a 0 for an open controllable switching element.
- FIG. 4 shows a typical current profile of a light-emitting diode field activated according to the invention during a clock period with an adapted switch-on duration and level of current flow.
- the individual light-emitting diodes are controlled as follows in the current curve shown in FIG.
- the light-emitting diode with the highest switch-on time is set to 100% of the switch-on time within one clock period and at the same time the current level for this light-emitting diode is reduced by this factor.
- the effective brightness of the light emitting diode remains the same with this procedure.
- the other light-emitting diodes are accordingly energized longer by the same factor.
- the current required is multiplied by the reciprocal value of this factor and thus reduced.
- the switch-on and switch-off times for the light-emitting diodes are determined from a light-emitting diode field. This can be done according to the invention using the same method that was described in FIG.
- FIG. 4 shows a current distribution during a clock period for 8 light-emitting diodes selected by way of example after the pulse width and the current requirement have been adapted, with the pulse widths shown below.
- the individual light-emitting diodes are again arranged sequentially as far as possible so that the switch-on and switch-off times overlap as little as possible.
- Fig. 4 results from the following time division of the light emitting diodes within a clock period.
- a 1 stands for a closed controllable switching element, so that the selected light-emitting diode is energized and a 0 for an open controllable switching element.
- FIG. 5a, b A further optimization is shown in Fig. 5a, b.
- the figures show the power distribution of a light emitting diode field with three groups. Each group within the light emitting diode field shows a similar current curve that has already been described in FIG. 3.
- 5a shows the case in which all groups use the same point in time as the start of their respective clock period.
- the power consumption of each group within the LED field adds up.
- peak powers of up to 270 W occur at the input of this circuit.
- Fig. 5b the case is shown that the start of a clock period for each group is time-shifted by a time period At.
- the groups are controlled offset by a third clock period.
- a maximum input power of 190 W is set in this example.
- the course of the power distribution is also more even.
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019105953.4A DE102019105953A1 (de) | 2019-03-08 | 2019-03-08 | Steuer- und/oder Regelungsmittel, Schaltungsanordnung und Verfahren zur Ansteuerung von Leuchtdioden in einem Leuchtdiodenfeld |
| PCT/EP2020/054219 WO2020182427A1 (de) | 2019-03-08 | 2020-02-18 | Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur ansteuerung von leuchtdioden in einem leuchtdiodenfeld |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3935921A1 true EP3935921A1 (de) | 2022-01-12 |
| EP3935921B1 EP3935921B1 (de) | 2023-12-13 |
Family
ID=69630322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20705962.7A Active EP3935921B1 (de) | 2019-03-08 | 2020-02-18 | Steuer- und/oder regelungsmittel, schaltungsanordnung und verfahren zur ansteuerung von leuchtdioden in einem leuchtdiodenfeld |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12052803B2 (de) |
| EP (1) | EP3935921B1 (de) |
| CN (1) | CN113557796B (de) |
| DE (1) | DE102019105953A1 (de) |
| WO (1) | WO2020182427A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI897387B (zh) | 2024-05-02 | 2025-09-11 | 友達光電股份有限公司 | 顯示面板 |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2159842A1 (en) * | 1994-12-05 | 1996-06-06 | Joe A. Ortiz | Diode drive current source |
| CN101551071A (zh) * | 2004-12-28 | 2009-10-07 | 株式会社日立制作所 | 照明装置和采用该装置的显示装置 |
| US7439679B2 (en) * | 2006-03-16 | 2008-10-21 | Motorola, Inc. | Method and apparatus for illuminating light sources within an electronic device |
| TWI346930B (en) * | 2006-12-01 | 2011-08-11 | Ind Tech Res Inst | Method for driving a light source and a backing light source |
| WO2008102479A1 (ja) * | 2007-02-21 | 2008-08-28 | Sharp Kabushiki Kaisha | 負荷駆動回路、集積回路、dc-dcコンバータ、および負荷駆動方法 |
| 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 |
| DE102008060042A1 (de) * | 2008-12-02 | 2009-09-17 | Daimler Ag | Verfahren zur Ansteuerung einer Beleuchtungseinheit, Beleuchtungseinheit und Beleuchtungseinrichtung für ein Fahrzeug |
| TWI400986B (zh) * | 2009-08-05 | 2013-07-01 | Chunghwa Picture Tubes Ltd | 發光二極體的驅動電路 |
| DE102010046795A1 (de) * | 2010-09-28 | 2012-03-29 | E:Cue Control Gmbh | Verfahren zum Betrieb eines LED-Leuchtmittels mit mehreren LEDs, Steuereinheit für ein LED-Leuchtmittel mit mehreren LEDs und LED-Leuchtmittel |
| 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 |
| 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 |
| DE102012219817A1 (de) * | 2012-10-30 | 2014-04-30 | Zumtobel Lighting Gmbh | Verfahren zum Betreiben einer Lichtquelle mit mehreren LEDs oder LED-Gruppen |
| DE102013223711A1 (de) * | 2013-11-20 | 2015-05-21 | Osram Gmbh | Steuern eines wenigstens zwei Halbleiterlichtquellen aufweisenden Leuchtmittels |
| DE102015210189A1 (de) | 2015-06-02 | 2016-12-08 | Tridonic Gmbh & Co Kg | Mehrkanal-LED-Konverter |
| JP6594690B2 (ja) * | 2015-07-22 | 2019-10-23 | ローム株式会社 | 電流ドライバ、led駆動回路、照明装置、電子機器 |
| CN109691235B (zh) | 2016-09-09 | 2021-02-19 | 株式会社小糸制作所 | 点亮电路、车辆用灯具及光源的驱动方法 |
| CN112086074A (zh) * | 2018-05-16 | 2020-12-15 | 海信视像科技股份有限公司 | 一种多分区背光驱动电路及显示装置 |
| WO2020049039A1 (en) * | 2018-09-04 | 2020-03-12 | Osram Gmbh | Circuit assembly and method for operating an led module |
| DE102019105954A1 (de) * | 2019-03-08 | 2020-09-10 | HELLA GmbH & Co. KGaA | Steuer- und/oder Regelungsmittel, Schaltungsanordnung und Verfahren zur Reduzierung des Strommaximums in einem Leuchtdiodenfeld |
| US11438982B2 (en) * | 2019-08-16 | 2022-09-06 | Lumileds Llc | LED pulse width modulation with active turn-off |
-
2019
- 2019-03-08 DE DE102019105953.4A patent/DE102019105953A1/de not_active Withdrawn
-
2020
- 2020-02-18 US US17/310,952 patent/US12052803B2/en active Active
- 2020-02-18 WO PCT/EP2020/054219 patent/WO2020182427A1/de not_active Ceased
- 2020-02-18 EP EP20705962.7A patent/EP3935921B1/de active Active
- 2020-02-18 CN CN202080019543.1A patent/CN113557796B/zh active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020182427A1 (de) | 2020-09-17 |
| US20220353964A1 (en) | 2022-11-03 |
| US12052803B2 (en) | 2024-07-30 |
| DE102019105953A1 (de) | 2020-09-10 |
| EP3935921B1 (de) | 2023-12-13 |
| CN113557796A (zh) | 2021-10-26 |
| CN113557796B (zh) | 2025-02-25 |
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