EP3138367A1 - Circuit électronique de commande de sources de lumière - Google Patents
Circuit électronique de commande de sources de lumièreInfo
- Publication number
- EP3138367A1 EP3138367A1 EP15719783.1A EP15719783A EP3138367A1 EP 3138367 A1 EP3138367 A1 EP 3138367A1 EP 15719783 A EP15719783 A EP 15719783A EP 3138367 A1 EP3138367 A1 EP 3138367A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pwm
- light source
- time interval
- during
- signal
- 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.)
- Withdrawn
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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
Definitions
- the present invention relates generally to the control of light sources.
- It relates more particularly to an electronic control circuit of at least a first light source and a second light source, comprising a generator of a pulse signal carrying variable duty cycle.
- the invention is particularly advantageous in the case of light-emitting diodes.
- the present invention provides an electronic circuit as mentioned above, comprising means for turning on the first light source in accordance with the pulse carrier signal for a first time interval and for turning on the second light source. in accordance with the pulse carrier signal during a second time interval.
- the duty cycle of the pulse carrier signal adjusts the light intensity of the first light source during the first time interval and that of the second light source during the second time interval. It is thus possible to control several light sources with a single signal carrying pulses. According to other optional features:
- said means comprise a first switch connected in series with the first light source and controlled by the pulse-carrying signal, a second switch connected in series with the second light source and controlled by the pulse-carrying signal, a third switch connected in series with the first light source and closed during the first time interval and a fourth switch connected in series with the second light source and closed during the second time interval;
- said means comprise a demultiplexer receiving as input the pulse-carrying signal and designed to generate the pulse-carrying signal on a first output during the first time interval and on a second output during the second time interval, a first switch connected in series with the first light source being controlled by the first output, a second switch connected in series with the second light source being controlled by the second output.
- the generator is adapted to apply a selection signal to the demultiplexer so as to select the application of the pulse carrier signal to the first output during the first time interval and the second output during the second time interval;
- the first light source and the second light source are light-emitting diodes
- the first light source and the second light source are two light-emitting diodes of a set of three light-emitting diodes emitting respectively three distinct colors in pairs;
- the first light source and the second light source respectively form part of two sets of three light-emitting diodes emitting respectively three distinct colors in pairs;
- said means are adapted to periodically repeat the firing of the first light source in accordance with the pulse-carrying signal and the firing of the second light source in accordance with the pulse-carrying signal, for example with a lower repetition period. at 40 ms;
- said means are adapted to turn on a third light source in accordance with the pulse-carrying signal during a third time interval.
- FIG. 1 represents a first example of an electronic diode control circuit according to the teachings of the invention
- FIG. 2 represents an example of signals generated for the control of three RGB LEDs in the circuit of FIG. 1;
- FIG. 3 represents a second example of an electronic diode control circuit according to the teachings of the invention.
- FIG. 4 represents a third example of implementation of the invention.
- FIG. 5 represents signals used in the context of the circuit of FIG. 4;
- FIG. 6 represents a fourth example of implementation of the invention.
- FIG. 1 represents a first example of an electronic diode control circuit according to the teachings of the invention.
- This electronic circuit comprises a GEN signal generator module which generates pulse width-carrying signals, or PWM ("Pulse Width Modulation”) signals, here three pulse-carrying signals PWM1, PWM2, PWM3.
- PWM Pulse Width Modulation
- the generator module GEN also generates three control signals C1, C2, C3.
- the generator module GEN is for example a microcontroller. Alternatively, it could be a specific application integrated circuit (or ASIC).
- the electronic circuit of FIG. 1 is for the control of three sets D10, D20, D30 of light emitting diodes commonly called "RGB LEDs", each RGB LED consisting of three light-emitting diodes: a red diode D1 1, D21, D31, a diode green D12, D22, D32 and a blue diode D13, D23, D33.
- RGB LEDs light emitting diodes commonly called "RGB LEDs”
- each set D10, D20, D30 the anodes of the diodes of the assembly are connected together and connected to a supply voltage V with the interposition of a controlled switch K10, K20, K30 associated with the assembly concerned.
- the controlled switches K10, K20, K30 are selectively opened or closed, respectively under the control signals C1, C2, C3.
- each diode Dxy is itself connected to a reference voltage (here ground) with the interposition of a resistor Rxy and a controlled switch Kxy connected in series.
- the three pulse-carrying signals PWM1, PWM2, PWM3 are respectively applied to the controlled switch K1 1, K21, K31 associated with the red diode D1 1, D21, D31 of the concerned assembly, to the controlled switch K12, K22, K32 associated with the green diode D1 2, D22, D32 of the assembly concerned and to the controlled switch K13, K23, K33 associated with the blue diode D13, D23, D33 of the whole concerned.
- FIG. 2 represents an example of signals generated by the generator module GEN for controlling the three RGB LEDs in the circuit which has just been described.
- control signal C1 commands the closing of the controlled switch K10, while the control signals C2, C3 respectively control the opening of the controlled switch K20 and the controlled switch K30.
- the pulse-carrying signals PWM1, PWM2, PWM3 are thus used for the control of the RGB LED D10: the pulse-carrying signal PWM1 is applied to the diode D1 1 by means of the switch Controlled K1 1, the pulse carrier signal PWM2 is applied to the diode D12 by means of the controlled switch K12 and the pulse carrier signal PWM3 is applied to the diode D13 by means of the controlled switch K13.
- the term "application of a pulse carrier signal to a diode” is understood here to mean that the diode is traversed by a current in accordance with the signal, which makes it possible to regulate its mean luminous intensity as a function of the signal duty cycle.
- the time interval T1 is followed by a time interval T2, during which the control signal C2 commands the closing of the controlled switch K20, while the control signals C1, C3 respectively control the opening of the controlled switch K10 and the controlled switch K30.
- the pulse-carrying signals PWM1, PWM2, PWM3 are therefore used for the control of the RGB LED D20: the pulse-carrying signal PWM1 is applied to the diode D21 by means of the controlled switch K21, the pulse carrier signal PWM2 is applied to the diode D22 by means of the controlled switch K22 and the pulse carrier signal PWM3 is applied to the diode D23 by means of the controlled switch K23.
- the signals PWM1, PWM2, PWM3 which makes it possible to obtain an illumination with the desired color (by mixing the light emitted by diodes D21, D22, D23). Since the desired color for the set D20 is generally different from that desired for the set D10, the signals PWM1, PWM2, PWM3 (and in particular the duty cycle of each of these signals) will generally be different from a range of time (for example T1) to the other (for example T2).
- the time interval T2 is followed by a time interval T3, during which the control signal C3 commands the closing of the controlled switch K30, while the control signals C1, C2 respectively control the opening of the controlled switch K10 and the controlled switch K20.
- the pulse-carrying signals PWM1, PWM2, PWM3 are therefore used for the control of the RGB LED D30: the pulse carrier signal PWM1 is applied to the diode D31 by means of the controlled switch K31, the pulse carrier signal PWM2 is applied to the diode D32 by means of the controlled switch K32 and the pulse carrier signal PWM3 is applied to the diode D33 by means of the controlled switch K33.
- the time interval T3 is followed by a time interval T4, during which the signals generated are identical to those generated during the time interval T1.
- T a period of the durations of the time intervals T1, T2, T3
- the signals applied during the time intervals T1, T2, T3 are repeated.
- the period T is preferably less than 40 ms; thus, because of the phenomenon of retinal persistence, each of the sets D10, D20, D30 will appear as continuously lit with the desired color for the set concerned.
- the control of three RGB LEDs was thus achieved by means of three PWM type signals and three control signals.
- T2, T3 have an identical duration. It could be envisaged that the different time intervals have different durations; the maximum achievable intensity, however, in this case will be different from one set D10, D20, D30 of diodes to another (the maximum intensity of a set D10, D20, D30 depending on the ratio between the time interval T1 , T2, T3 during which the set concerned is fed and the duration of a period T).
- FIG. 3 represents a second example of an electronic diode control circuit according to the teachings of the invention.
- This second example is a variant of Figure 1 which differs only in the manner to generate the control signals C1, C2, C3.
- the elements common to Figures 1 and 3 will not be described again here.
- the generator module GEN generates three pulse-carrying signals (as in the first example described with reference to FIG. 1) and two selection signals B1, B2.
- These two selection signals B1, B2 are applied to two selection inputs of a DMX demultiplexer, which also receives on its main input a control voltage Ucmd of the controlled switches K1 0, K20, K30.
- the DMX demultiplexer has three outputs C1, C2, C3 which are respectively applied to the controlled switch K10 associated with the set of diodes D1 0, to the controlled switch K20 associated with the set of diodes D20 and to the switch ordered K30 associated with the set of diodes D30.
- the DMX demultiplexer applies the signal received on its main input (here the control voltage Ucmd of the controlled switches K1 0, K20, K30) on one of its outputs, defined according to the signals received on its selection inputs, here the signals selection B1, B2 generated by the generator module GEN.
- the output C1 is selected and the control voltage Ucmd is applied to this output C1 and thus to the controlled switch K10 (which causes its closing).
- the outputs C2, C3 carry no signal and the controlled switches K20, K30 are thus open.
- the output C2 is selected and the control voltage Ucmd is applied to this output C2 and thus to the switch ordered K20 (which causes it to shut down).
- the outputs C1, C3 carry no signal and the controlled switches K1 0, K30 are thus open.
- FIG. 4 shows a third example of implementation of the invention.
- a single LED RGB DO formed of a red light-emitting diode D1, a green light-emitting diode D2 and a blue light-emitting diode D3 is controlled by means of a generator module GEN 'generating a single signal PWM pulse carrier.
- each of the light-emitting diodes D1, D2, D3 is connected to a supply voltage V; the cathode of each of the light-emitting diodes is connected to a reference potential (here the ground) via a resistor R1, R2, R3 and a controlled switch K1, K2, K3 connected in series.
- the generator module GEN 'generates a PWM pulse carrier signal of variable duty ratio (adjustable by the generator module GEN' according to commands received from the user).
- the two selection signals B1 ', B2' are respectively applied to two selection inputs of a demultiplexer DMX ', which receives on its main input the PWM pulse carrier signal generated by the generator module GEN'.
- the demultiplexer DMX ' has three outputs S1, S2, S3, only one of which carries the PWM signal received at the input, the carrier output of the signal PWM being selected as a function of the signals (here ⁇ 1', B2 ') received on the selection inputs of the demultiplexer DMX ', as will be explained again below with reference to FIG.
- the outputs S1, S2, S3 of the demultiplexer DMX ' are respectively applied as the control signal of the controlled switches K1, K2, K3.
- FIG. 5 represents, by way of example, signals used in the context of the circuit of FIG. 4.
- the selection signals B1 ', B2' are both low so that the PWM signal received at the input of DMX demultiplexer (here a signal with a duty cycle of about 75%) is applied to the output S1, as can be seen in FIG. 5, which causes the diode D1 to illuminate with an average intensity determined by the duty cycle. PWM signal at this point in time (here about 75%).
- the diodes D2 and D3 are turned off during this first time interval T1 1.
- the selection signal B1 ' is at the high level, while the selection signal B2' remains at the low level.
- the signal PWM received at the input of the demultiplexer DMX ' (here a signal having a duty ratio of approximately 25%) is then applied to the output S2 of the DMX demultiplexer', which causes (via the control of the controlled switch K2) the illumination of the diode D2 with an average intensity determined by the duty cycle of the PWM signal during this time interval T12, here about 25%.
- the generator module GEN 'generates, during the first time interval T1 1, a PWM signal whose duty cycle is intended for the control of the diode D1 and, during the second time interval T1 2, a PWM signal whose duty cycle, generally different, is for the control of the diode D2.
- the selection signal B1 ' is at the low level and the selection signal B2' is at the high level, which causes the application on the output S3 of the PWM signal received at the input of the DMX demultiplexer (here a signal having a duty cycle of about 50%). Since the output S3 is applied to the control input of the controlled switch K3, it is then the diode D3 which is illuminated with an average intensity determined by the duty cycle of the PWM signal during the third time interval T13. here about 50%.
- the third time interval T13 is followed by a fourth time interval T14 during which the signals (in particular those generated by the generator module GEN ') are identical to those observed during the first time interval T1 1, and then a second time interval T14.
- fifth time interval T15 during which the signals are identical to those observed during the second time interval T12, and so on.
- the period T1 0 of repetition that is to say the sum of the durations of the first, second and third time intervals T1 1, T12, T13, is chosen less than 40 ms so that the human eye will not perceive the extinction periods of the diodes during each period T10 and will thus see an illumination of a color formed by the addition of the lightings respectively generated by the diodes D1, D2, D3 as indicated above.
- a period T10 of between 1 and 40 ms will be chosen.
- signals S1, S2, S3 may optionally be used for the control of other RGB LEDs (mounted in parallel with the RGB LED DO); these other RGB LEDs will then illuminate with the same color as the RGB DO LED.
- FIG 6 shows a fourth example of implementation of the invention.
- each RGB LED forms a set of three light-emitting diodes of different colors two by two; specifically, each RGB LED comprises a red diode D1 1 1, D121, D131, a green diode D1 12, D122, D132 and a blue diode D1 13, D123, D133.
- each set D1 1 0, D120, D1 30, the anodes of the diodes of the set are connected together and connected to a supply voltage V.
- the cathode of each diode D1 xy is connected to a voltage of reference (here the mass) with the interposition of a resistor R1 xy and a controlled switch K1 xy connected in series.
- the electronic control circuit of the RGB LEDs D1 10, D1 20, D1 30 comprises a signal generator module GEN "and three demultiplexers DMX1, DMX2, DMX3.
- the generator module GEN "generates three PWM pulse-carrying signals R, PWM G, PWM B, each having a specific duty cycle, and two selection signals B1 ", B2".
- each pulse carrier signal PWM R, PWM G, PWM B is here dedicated to the control of the diodes of a given color, while the selection signals B1 ", B2" allow to determine to which set of diodes (that is to say, which RGB LED) will be applied the different PWM signals R, PWM G, PWM B at a given moment.
- the first demultiplexer DMX1 receives on its main input the PWM pulse carrier signal R and, on two selection inputs, respectively the selection signals B1 ", B2".
- the first demultiplexer DMX1 has three outputs PWM_R_1, PWM_R_2, PWM_R_3 which are respectively connected to the control input of the controlled switch K1 1 1 associated with the red diode D1 1 1 of the set D1 10, at the input of control of the controlled switch K121 associated with the red diode D121 of the set D1 20 and the control input of the controlled switch K131 associated with the red diode D131 of the set D130.
- the generator module GEN controls each time the duty cycle of the signal PWM R so that it corresponds to that which must be applied to the red diode concerned.
- the second demultiplexer DMX2 receives on its main input the PWM pulse carrier signal G and, on two selection inputs, respectively the selection signals B1 ", B2".
- the second demultiplexer DMX2 has three outputs PWM_G_1, PWM_G_2, PWM_G_3 which are respectively connected to the control input of the controlled switch K1 12 associated with the green diode D1 12 of the set D1 10, to the control input of the controlled switch K122 associated with the green diode D122 of the set D120 and the control input of the controlled switch K132 associated with the green diode D132 of the set D130.
- the generator module GEN By applying selection signals B1 “, B2" (identical to those applied to the first demultiplexer DMX1) to the selection inputs of the second multiplexer DMX2, the generator module GEN "causes (for the predetermined period of time) the application of the PWM signal G successively to the green diode D1 12 of the set D1 1 0, to the green diode D1 22 of the set D120 and to the green diode D132 of the set D130. For each diode D1 1 2, D122, D132, the generator module GEN "controls the duty cycle of the PWM signal G so that it corresponds to that which one wants to apply to the diode concerned.
- the third demultiplexer DMX3 receives on its main input the PWM pulse carrier signal B and, on two selection inputs, respectively the selection signals B1 ", B2".
- the third demultiplexer DMX3 has three outputs PWM_B_1, PWM_B_2, PWM_B_3 which are respectively connected to the control input of the controlled switch K1 1 3 associated with the blue diode D1 13 of the set D1 10, to the control input of the controlled switch K123 associated with the blue diode D123 of the set D1 20 and the control input of the controlled switch K133 associated with the blue diode D133 of the set D130.
- the generator module GEN "causes (during the predetermined period of time) the application of PWM signal B successively to the blue diode D1 13 of the set D1 1 0, to the blue diode D123 of the set D120 and to the blue diode D133 of the set D130. For each diode D1 13, D123, D133, the generator module GEN "command the duty cycle of the PWM signal B so that it corresponds to that which one wants to apply to the diode concerned.
- the predetermined period of time mentioned above (time during which PMW R, PWM G, PWM B signals are successively applied to the different sets D1 10, D1, 20, D1 30) is less than 40 ms so that the human eye does not see the extinction periods of the different sets D1 1 0, D120, D130 during the predetermined period of time, but on the contrary sees each set D1 10, D120, D130 illuminated with a particular color determined by the respective duty cycles of the PMW R, PWM G, PWM B signals when applied to the set concerned.
- the application of the signals applied during the predetermined period of time is repeated continuously as long as one does not wish to modify the characteristics of the lighting, as in the case of the previous embodiments.
- the foregoing embodiments are applied to the case of RGB LEDs.
- the invention is however also applicable to the control of a plurality of light-emitting diodes having the same lighting spectrum, in particular several white light-emitting diodes.
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 |
---|---|---|---|
FR1453976A FR3020739B1 (fr) | 2014-04-30 | 2014-04-30 | Circuit electronique de commande de sources de lumiere |
PCT/FR2015/050743 WO2015166152A1 (fr) | 2014-04-30 | 2015-03-25 | Circuit electronique de commande de sources de lumiere |
Publications (1)
Publication Number | Publication Date |
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EP3138367A1 true EP3138367A1 (fr) | 2017-03-08 |
Family
ID=51168185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15719783.1A Withdrawn EP3138367A1 (fr) | 2014-04-30 | 2015-03-25 | Circuit électronique de commande de sources de lumière |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3138367A1 (fr) |
FR (1) | FR3020739B1 (fr) |
WO (1) | WO2015166152A1 (fr) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2387288A1 (fr) * | 2010-04-27 | 2011-11-16 | Valeo Vision | Procédé et dispositif de commande d'une pluralité d'ensembles de LED d'un véhicule automobile |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7245228B2 (en) * | 2004-05-27 | 2007-07-17 | Nokia Corporation | Portable electronic apparatus with controlled light sources |
US8633613B2 (en) * | 2008-04-25 | 2014-01-21 | Power Research Electronics B.V. | Power converter |
-
2014
- 2014-04-30 FR FR1453976A patent/FR3020739B1/fr active Active
-
2015
- 2015-03-25 WO PCT/FR2015/050743 patent/WO2015166152A1/fr active Application Filing
- 2015-03-25 EP EP15719783.1A patent/EP3138367A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2387288A1 (fr) * | 2010-04-27 | 2011-11-16 | Valeo Vision | Procédé et dispositif de commande d'une pluralité d'ensembles de LED d'un véhicule automobile |
Also Published As
Publication number | Publication date |
---|---|
FR3020739A1 (fr) | 2015-11-06 |
FR3020739B1 (fr) | 2019-05-03 |
WO2015166152A1 (fr) | 2015-11-05 |
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