EP3935921A1 - Moyens de commande et/ou de régulation, circuit et procédé pour la commande de diodes électroluminescentes dans un réseau de diodes électroluminescentes - Google Patents

Moyens de commande et/ou de régulation, circuit et procédé pour la commande de diodes électroluminescentes dans un réseau de diodes électroluminescentes

Info

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
Application number
EP20705962.7A
Other languages
German (de)
English (en)
Other versions
EP3935921B1 (fr
Inventor
Dieter Nietfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hella GmbH and Co KGaA
Original Assignee
Hella GmbH and Co KGaA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hella GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Publication of EP3935921A1 publication Critical patent/EP3935921A1/fr
Application granted granted Critical
Publication of EP3935921B1 publication Critical patent/EP3935921B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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)

Abstract

Moyens de commande et/ou de régulation, pour la commande et/ou la régulation d'un réseau de diodes électroluminescentes comprenant n diodes électroluminescentes, comprenant des sorties auxquelles des signaux de commande et/ou de régulation pour la commande et/ou la régulation d'éléments de commutation pouvant être commandés peuvent être prélevés, des moments d'allumage et/ou des moments d'extinction (I) d'impulsions pouvant être, avec les moyens de commande et/ou de régulation, définis par les signaux de commande et/ou les signaux de régulation et un et/ou plusieurs éléments de commutation pouvant être commandés pouvant être commandés pour se fermer ou s'ouvrir durant les impulsions déterminées, un nombre de k groupes pouvant être fixé, chaque DEL étant associée à un des k groupes, de telle sorte que chacun des k groupes contienne mj· diodes électroluminescentes, où 1 ≤ j ≤ k, et formule I (FI), et les moments d'allumage et/ou moments d'extinction des impulsions de chaque groupe étant fixés de telle façon par le moyen de commande et/ou de régulation que les impulsions se recoupent le moins possible.
EP20705962.7A 2019-03-08 2020-02-18 Moyens de commande et/ou de régulation, circuit et procédé pour la commande de diodes électroluminescentes dans un réseau de diodes électroluminescentes Active EP3935921B1 (fr)

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 (fr) 2019-03-08 2020-02-18 Moyens de commande et/ou de régulation, circuit et procédé pour la commande de diodes électroluminescentes dans un réseau de diodes électroluminescentes

Publications (2)

Publication Number Publication Date
EP3935921A1 true EP3935921A1 (fr) 2022-01-12
EP3935921B1 EP3935921B1 (fr) 2023-12-13

Family

ID=69630322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20705962.7A Active EP3935921B1 (fr) 2019-03-08 2020-02-18 Moyens de commande et/ou de régulation, circuit et procédé pour la commande de diodes électroluminescentes dans un réseau de diodes électroluminescentes

Country Status (5)

Country Link
US (1) US12052803B2 (fr)
EP (1) EP3935921B1 (fr)
CN (1) CN113557796A (fr)
DE (1) DE102019105953A1 (fr)
WO (1) WO2020182427A1 (fr)

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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
CN101589539B (zh) * 2007-02-21 2012-10-17 夏普株式会社 负载驱动电路、集成电路、直流-直流变换器、及负载驱动方法
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
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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
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WO2012164511A1 (fr) * 2011-06-03 2012-12-06 Osram Ag Procédé de commande de sources d'éclairage à del et dispositif correspondant
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Also Published As

Publication number Publication date
WO2020182427A1 (fr) 2020-09-17
EP3935921B1 (fr) 2023-12-13
CN113557796A (zh) 2021-10-26
US12052803B2 (en) 2024-07-30
DE102019105953A1 (de) 2020-09-10
US20220353964A1 (en) 2022-11-03

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