EP3616471B1 - Procédé et système de pilotage du courant électrique au sein d'une source lumineuse a semi-conducteur définissant au moins deux zones d'émission lumineuse distinctes - Google Patents

Procédé et système de pilotage du courant électrique au sein d'une source lumineuse a semi-conducteur définissant au moins deux zones d'émission lumineuse distinctes Download PDF

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Publication number
EP3616471B1
EP3616471B1 EP18719209.1A EP18719209A EP3616471B1 EP 3616471 B1 EP3616471 B1 EP 3616471B1 EP 18719209 A EP18719209 A EP 18719209A EP 3616471 B1 EP3616471 B1 EP 3616471B1
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EP
European Patent Office
Prior art keywords
light
light source
value
emitting region
luminous flux
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EP18719209.1A
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German (de)
English (en)
French (fr)
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EP3616471A1 (fr
Inventor
Pierre Albou
Vincent Godbillon
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Valeo Vision SAS
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Valeo Vision SAS
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching 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]
    • H05B45/10—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
    • H05B45/325—Pulse-width modulation [PWM]

Definitions

  • the present invention relates to the field of light methods and assemblies comprising a system for controlling an electric current within a semiconductor light source provided with a substrate.
  • the present invention relates to a method for controlling an electric current within a semiconductor light source as defined by claim 1, a light assembly as defined by claim 4, and light device vehicle comprising at least one such light assembly.
  • a method of controlling an electric current within a semiconductor light source provided with a substrate, making it possible to modify the luminous flux of the light source, is known. Such a process is disclosed in the document WO2017/025441 A1 .
  • the method is implemented by a control system comprising a member for adjusting the average value of an electrical quantity relating to the electric current received by the light source, as well as a device for connecting the light source to the member adjustment.
  • the electrical quantity is for example the voltage, intensity or electrical power of the electric current.
  • Such a method comprises a step consisting of adjusting, via the adjustment member, the average value of the electrical quantity relating to the electrical current received by the light source as a function of a setpoint of current, electrical voltage or average electrical power (born). Setpoint current, electrical voltage or average electrical power then corresponds to the desired luminous flux for the light source.
  • the adjustment member is generally a chopper connected to a switching power supply, and the adjustment carried out by the chopper is a pulse width modulation type regulation.
  • the minimum duty cycle of this regulation below which one must not go below without seriously harming the precision of current control, is generally between 5 and 7%. More precisely, if the duty cycle applied during this regulation by pulse width modulation is less than the value of 5%, “soft” fronts may appear in the control of the electrical quantity relating to the electric current received by the light source.
  • the minimum duty cycle that should be applied during pulse width modulation regulation to achieve such flow dynamics should be less than or equal to 5%.
  • Such a situation is for example known in the field of vehicles, when the light source is intended to be used both in a “daytime running light” function and in a “position light” function.
  • a known solution consists of adding a resistance to the control system previously described, and connecting this resistance in series with the light source whose current we are trying to control.
  • the value of this resistance is chosen so as to allow thermal dissipation of the energy linked to “soft” fronts.
  • such a solution is extremely expensive, due to the cost of such resistance.
  • such a resistance does not make it possible to improve the precision of current control.
  • the technical problem that the invention aims to solve is therefore to propose a method and a system for controlling an electric current within a semiconductor light source provided with a substrate, making it possible to increase the dynamics of flow of the source, in particular to obtain a ratio between the extreme flux values greater than or equal to 100, and this in a simple manner, at reduced cost, and without loss of efficiency or electromagnetic disturbance in the system.
  • a first object of the invention is a method of controlling an electric current within a semiconductor light source as defined in claim 1.
  • the light source defines on its substrate at least two selectively activatable light emission zones, it is possible to adjust separately and independently, via the adjustment member, the luminous flux values associated respectively with each of the zones d light emission. It is thus possible, via this setting as well as the addition or selective activation of luminous zones, to obtain a greater range of adjustment of the luminous flux, without sacrificing the precision of current control, nor causing problems of efficiency or electromagnetic compatibility at the within the system. Furthermore, this increase in the adjustment range of possible values for the luminous flux is obtained without modification of the other physical characteristics of the light source, such as the hue for example. Furthermore, the control method according to the invention uses only one adjustment member, this member being a conventional adjustment member. Thus, the control method according to the invention makes it possible to increase the flow dynamics of the light source, in a simple manner, at reduced cost, and without loss of efficiency or electromagnetic disturbance in the system.
  • control method according to the invention may optionally present one or more of the characteristics defined by dependent claims 2 to 3.
  • the invention also relates to a light assembly as defined by claim 4.
  • the light assembly according to the invention may optionally have one or more of the characteristics defined in dependent claims 5 to 8.
  • the light source comprises a plurality of photo-emitting elements, the photo-emitting elements being distributed into several groups of distinct photo-emitting elements, each group of photo-emitting elements corresponding to one of said light zones, the photo-emitting elements of the groups corresponding to said at least two light emitting zones being interleaved so that said groups of photo-emitting elements form interlaced matrices of discrete photo-emitting elements.
  • This embodiment of the invention advantageously makes it possible to maintain an almost uniform appearance in the visual rendering of the light source, whatever the value of the luminous flux emitted by this source.
  • the vehicle lighting device according to the invention is a road lighting device, in particular a projector, or a signaling device, in particular a traffic light, or a signaling device. lighting of a vehicle interior.
  • the invention also relates to a vehicle comprising at least one vehicle lighting device as described above.
  • FIG. 1 illustrates a vehicle lighting device 10, comprising a lighting assembly 12.
  • the lighting device 10 is for example a road lighting device, in particular a projector.
  • the light device 10 is a signaling device, in particular a traffic light.
  • the light device 10 is a vehicle passenger compartment lighting device.
  • the light assembly 12 comprises a semiconductor light source 13, and a system 16 for controlling an electric current within the light source 13.
  • the light assembly 12 also comprises an optical module, such a module does not not being shown in the figures for reasons of clarity.
  • the light source 13 comprises a substrate 18 and defines, on its substrate 18, at least two distinct light emission zones 20.
  • the substrate 18 is for example essentially composed of silicon.
  • the light source 13 further comprises several photo-emitting elements 22.
  • the photo-emitting elements 22 are distributed into several groups 24A, 24B, 24C of elements separate photoemitters. Each group 24A, 24B, 24C of photoemitting elements 22 corresponds to one of the distinct light emission zones 20.
  • the photoemitting elements 22 are distributed into three groups 24A, 24B, 24C of distinct photoemitting elements, and the light source 13 defines on its substrate 18 three corresponding light emission zones 20A, 20B, 20C.
  • the photoemitting elements 22 of the groups 24A, 24B, 24C are interleaved so that these groups 24A, 24B, 24C of photoemitting elements form interlaced matrices of discrete photoemitting elements 22.
  • matrix of discrete photoemitting elements we mean a network of photo-emitting elements interconnected and forming a group of discrete photo-emitting elements, whether this network is regular or not.
  • each photoemitting element 22 comprises at least one electroluminescent rod 26.
  • each light-emitting element 22 comprises at least one electroluminescent rod 26 and one photoluminescent element 28.
  • each light-emitting element 22 comprises several electroluminescent rods 26 and one photoluminescent element 28.
  • the electroluminescent rods 26 are thus distributed into several groups of electroluminescent rods 26 , each group corresponding here to a photoemitting element 22.
  • the electroluminescent rods 26 within the same photoemitting element 22 are electrically connected to each other. More preferably, the electroluminescent rods 26 within the same photoemitting element 22 are electrically connected in parallel.
  • Each electroluminescent rod 26 extends from the substrate 18.
  • each electroluminescent rod 26 has submillimeter dimensions.
  • Each stick electroluminescent 26 extends for example in a preferred direction from the substrate 18.
  • the electroluminescent rods 26 of the light source 13 extend in the same preferred direction from the substrate 18.
  • Each electroluminescent rod 26 comprises for example a nitride of metal, in particular gallium nitride.
  • Each photoluminescent element 28 is for example formed of a layer of photoluminescent material.
  • Each photoluminescent element 28 designates a light converter comprising at least one luminescent material designed to absorb at least a portion of at least one excitation light emitted by a light source and to convert at least a portion of said absorbed excitation light into emission light having a wavelength different from that of the excitation light.
  • the material of the photoluminescent element is for example one of the following components: Y 3 A 15 O 12 :Ce 3+ (YAG), (Sr,Ba) 2 SiO 4 :Eu 2+ , Ca x (Si,Al) 12 (O,N) 16 :Eu 2+
  • the light source 13 is a two-dimensional monolithic source, for example of the two-dimensional monolithic light-emitting diode type, and each photoemitting element 22 is an element of this monolithic source.
  • the photo-emitting elements are distributed into several groups of distinct photo-emitting elements on this source, each group corresponding to one of the distinct light emission zones.
  • the light emitting elements of the groups are interleaved such that these groups of light emitting elements form interleaved arrays of discrete light emitting elements. This is the case where the photoemitting elements take the form of a pad. In an exemplary embodiment, the light is emitted from the top of the pads.
  • FIG. 3 represents the light source 13, according to a second embodiment of the invention, alternative to the embodiment illustrated in the figure 2 .
  • the light source 13 defines on its substrate 18 several concentric light emission zones 20D, 20E, 20F.
  • the light source 13 defines on its substrate 18 three concentric light emission zones: a first light emission zone 20D, a second light emission zone 20E surrounding the first zone 20D, and a third light emission zone 20F surrounding the second zone 20E.
  • the light source 13 when the first light emission zone 20D is activated, the light source 13 is used in the vehicle according to a “position light” function; when at least the second light zone 20E is activated, the light source 13 is used in the vehicle according to a “daytime running light” function; and when at least the third light zone 20F is activated, the light source 13 is used in the vehicle according to a “high beam” function.
  • the light source 13 comprises several electroluminescent rods 26.
  • the electroluminescent rods 26 are thus distributed into several groups 29D, 29E, 29F of electroluminescent rods 26, each group corresponding to one of the light emission zones 20D, 20E, 20F.
  • the electroluminescent sticks 26 within the same group 29D, 29E, 29F are electrically connected to each other. More preferably, the electroluminescent sticks 26 within the same group 29D, 29E, 29F are electrically connected in parallel.
  • Each electroluminescent rod 26 extends from the substrate 18.
  • each electroluminescent rod 26 has submillimeter dimensions.
  • Each electroluminescent stick 26 extends for example in one direction privileged from the substrate 18.
  • the electroluminescent rods 26 of the light source 13 extend in the same preferred direction from the substrate 18.
  • Each electroluminescent rod 26 comprises for example a metal nitride, in particular a gallium nitride.
  • the light source 13 is a high definition light source.
  • high definition light source is meant a light source comprising a high number, typically greater than or equal to 1000, of electroluminescent elements capable of being powered separately.
  • the light source 13 defines on its substrate two concentric light emission zones: a first light emission zone and a second light emission zone surrounding the first zone.
  • the surface of the second light emission zone is greater than that of the first light emission zone, for example such that the ratio between this surface and the surface of the first light emission zone light emission is greater than or equal to 9, and is preferably greater than or equal to 10.
  • the density of the electroluminescent rods of the group corresponding to the second light emission zone is greater than that of the group corresponding to the first light emission zone, for example such that the ratio between this density and the density of the electroluminescent rods of the group corresponding to the first light emission zone is greater than or equal to 9, and is preferably greater than or equal to 10.
  • control system 16 comprises a member 30 for adjusting the average value of an electrical quantity relating to the electric current received by the light source 13, and a device 32 for connecting the light source 13 to the adjustment member 30
  • control system 16 further comprises a member 34 for measuring an electrical quantity relating to an electric current circulating within the light source 13.
  • connection device 32 is connected to the distinct light emission zones 20 of the light source 13 and is capable of selectively activating these light emission zones 20, as illustrated in the figure 2 And 3 .
  • the connection device 32 comprises for example a semiconductor electronic switching component 38, such as a transistor for example.
  • the electronic component 38 comprises two conduction electrodes and a control electrode, not shown in the figures for reasons of clarity.
  • One of the conduction electrodes forms, for example, a 40A negative terminal.
  • the other conduction electrode is for example capable of being connected to one or more positive terminals 40B.
  • the negative terminal 40A is connected to a cathode 42A arranged on the substrate 18.
  • each positive terminal 40B is connected to anodes 42B belonging to the same group 24A, 24B, 24C of photoemitting elements, each anode 42B being arranged on a photoemitting element 22. More precisely, each anode 42B is for example formed by a layer conductive deposited above the substrate 18, on the side of the rods 26 of the photoemitting element 22 on which the anode 42B is arranged. Preferably, each anode 42B electrically joins the rods 26 of the photoemitting element 22 on which it is arranged.
  • each positive terminal 40B is connected to an anode 43B arranged within a group 29D, 29E, 29F of electroluminescent sticks 26. More precisely, each anode 43B is for example formed by a conductive layer deposited above the substrate 18, on the side of the sticks 26 of the group 29D, 29E, 29F within which the anode 43B is arranged. Preferably, each anode 43B electrically joins the rods 26 of the group 29D, 29E, 29F within which it is arranged.
  • the control electrode is able to receive a signal 44 for controlling activation of one of the light emission zones 20.
  • the adjustment member 30 is connected to a source 36 of supplying current or electrical input voltage, in particular direct current or electrical input voltage.
  • the power source 36 is for example arranged within the light assembly 12.
  • the power source 36 is arranged within the vehicle and forms for example the vehicle battery.
  • the power source 36 is for example connected via a distributor, also located within the vehicle.
  • the power source 36 is a DC input electrical voltage supply source, providing a substantially constant input electrical voltage U 0 .
  • the adjustment member 30 is configured to adjust, for each activated light zone 20, the average value of the electrical quantity relating to the electric current received by the light source 13, as a function of a current setpoint 46A, 46B, 46C, of electrical voltage or average electrical power associated with this activation.
  • the current, electrical voltage or average electrical power setpoint 46A, 46B, 46C is for example stored in a memory internal or external to the light device 10, not shown in the figures.
  • the setpoint 46A, 46B, 46C can be dynamically updated in the memory, in particular as a function of the temperature, by a control module connected to the memory. Such a control module is not shown in the figures for reasons of clarity.
  • the adjustment member 30 is a chopper capable of supplying an electrical output current intended to circulate within the light source 13.
  • the electrical quantity to be adjusted is the electrical voltage
  • the adjustment member setting 30 is configured to adjust the average value of the output voltage U1 as a function of an average current setpoint 46A, 46B, 46C.
  • the chopper forming the adjustment member 30 has a switching frequency of between 50 Hz and 1 kHz, preferably between 200 Hz and 1 kHz so that the human eye does not distinguish oscillations, more preferably substantially equal to 400 Hz.
  • control system 16 implements a voltage supply and current control of the light source 13.
  • the measuring member 34 is connected to the adjusting member 30.
  • the measuring member 34 is capable of providing at least one Ism data measurement of an electrical quantity relating to the electric current received by the light source 13.
  • the measured electrical quantity is an electric current
  • the measuring member 34 is able to provide Ism data measuring the average value of the electric current received by the light source 13.
  • the adjusting member 30 is advantageously configured to regulate, for each activated light zone 20, the average value of the electrical output current as a function of the value of measurement data Ism supplied by the measuring device 34, and of the average current setpoint 46A, 46B, 46C.
  • the measuring member 34 comprises for example a resistor 48, connected in series with the light source 13, and a signal amplification module 50 intended to amplify the voltage value taken by the resistor 48.
  • control system can be integrated, that is to say mounted, on the light source.
  • control unit may further comprise a central processing unit coupled with a memory on which a computer program is stored which includes instructions allowing the processor to carry out steps generating signals allowing control of the light source.
  • the control unit can be an integrated circuit, for example an ASIC (acronym for “Application-Specific Integrated Circuit”) or an ASSP (acronym for “Application Specific Standard Product”).
  • control system 16 receives a control signal for activation of a first light emission zone 20A; 20D of the light source 13.
  • the connection device 32 then receives a corresponding activation control signal 44, and consequently activates the first light emission zone 20A; 20D.
  • the adjustment member 30 adjusts the average value of the electrical output voltage U1 which it supplies to the light source 13, as a function of a first average current setpoint 46A. A first value of a first luminous flux is thus obtained for the light source 13. This first luminous flux corresponds to the flux emitted by the first light emission zone 20A; 20D.
  • the chopper forming the adjustment member 30 regulates the average value of the electric current which it supplies to the light source 13, by modifying the cyclical ratio of application of the input electric voltage U 0 to the terminals of the first zone bright 20A; 20D.
  • the duty cycle, modified by the chopper however remains greater than a value equal to 5%.
  • the adjustment step 62 comprises a first sub-step of measuring, by the measuring member 34, the average current received by the light source 13; and a second sub-step of supplying, by the measuring member 34 to the adjusting member 30, data Ism measuring this average current.
  • the chopper forming the adjustment member 30 then regulates the average value of the output electric current as a function of the value of the average current measurement data Ism provided by the measuring member 34, and of the first current setpoint 46A AVERAGE.
  • control system 16 receives a control signal for activation of a second light emission zone 20B; 20E of the light source 13.
  • the connection device 32 then receives a corresponding activation control signal 44, and consequently activates the second light emission zone 20B; 20E.
  • the adjustment member 30 adjusts the average value of the electrical output voltage U1 which it supplies to the light source 13, as a function of a second average current setpoint 46B.
  • a second value of a second luminous flux is thus obtained for the light source 13.
  • This second luminous flux corresponds to the flux emitted by at least the second light emission zone 20B; 20E.
  • the second luminous flux corresponds to the flux emitted by the first light emission zone 20A; 20D and by the second light emission zone 20B; 20E.
  • the second light flux corresponds to the flux emitted only by the second light emission zone 20B; 20E.
  • the method comprises, prior to step 66, an additional step of deactivating the first light emission zone 20A; 20D by the connection device 32.
  • the chopper forming the adjustment member 30 regulates the average value of the electric current which it supplies to the light source 13, by modifying the cyclical ratio of application of the input electric voltage U 0 to the terminals by at least the second light zone 20B; 20E.
  • the duty cycle, modified by the chopper however remains greater than a value equal to 5%.
  • the adjustment member 30 adjusts the average value of the electrical output voltage U1 which it supplies to the light source 13, so that the ratio between the second value of the second flux luminous flux obtained at the end of this step 66, and the first value of the first luminous flux obtained at the end of the adjustment step 64 is greater than or equal to 100, and preferably between 100 and 1000.
  • the duty cycle value must be greater than 5%, and
  • the method further comprises a following step 68 during which the control system 16 receives a control signal for activation of a third light emission zone 20C; 20F of the light source 13.
  • the connection device 32 then receives a control signal corresponding activation 44, and consequently activates the third light emission zone 20C; 20F.
  • the adjustment member 30 adjusts the average value of the electrical output voltage U1 which it supplies to the light source 13, as a function of a third current setpoint 46C AVERAGE.
  • a third value of a third luminous flux is thus obtained for the light source 13.
  • This third luminous flux corresponds to the flux emitted by at least the third light emission zone 20C; 20F.
  • the third light flux corresponds to the flux emitted by the first light emission zone 20A; 20D, by the second light emission zone 20B; 20E and by the third light emission zone 20C; 20F.
  • the third light flux corresponds to the flux emitted by one of the first and second light emission zones 20A, 20B; 20D, 20E and by the third light emission zone 20C; 20F, or to the flux emitted only by the third light emission zone 20C; 20F.
  • the method comprises, prior to step 70, an additional step of deactivation of the first light emission zone 20A; 20D and/or the second light emission zone 20B; 20E by the connection device 32.
  • the chopper forming the adjustment member 30 regulates the average value of the electric current which it supplies to the light source 13, by modifying the cyclical ratio of application of the input electric voltage U 0 to the terminals by at least the third light zone 20C; 20F.
  • the duty cycle, modified by the chopper however remains greater than a value equal to 5%.
  • the adjustment member 30 adjusts the average value of the electrical voltage of output U1 which it supplies to the light source 13, so that the ratio between the third value of the third luminous flux obtained at the end of this step 70, and the second value of the second luminous flux obtained at the end from adjustment step 66 is greater than or equal to 4, and preferably between 4 and 100; and that the ratio between the second value of the second luminous flux obtained at the end of the adjustment step 66, and the first value of the first luminous flux obtained at the end of the adjustment step 64 is greater or equal to 3, and preferably between 3 and 30.
  • the adjustment carried out by the chopper forming the adjustment member 30 during the adjustment steps 62, 66, 70 is a pulse width modulation type regulation.
  • FIG. 5 is an example of controlling the duty cycle of application of the input electrical voltage U 0 , illustrating steps 60 to 70 of the method of controlling a current described above, for a light source 13 according to the example of particular achievement represented on the Figure 3 . More precisely, the Figure 5 is a set of three diagrams 72D, 72E, 72F each representing the evolution of the cyclic ratio R of application of the input electrical voltage U 0 to the terminals respectively of one of the light zones 20D, 20E, 20F, as a function of the total luminous flux ⁇ emitted by the light source 13.
  • the maximum luminous flux emitted by the third light emission zone 20F is greater than the maximum luminous flux emitted by the second light emission zone 20E, which is -even greater than the maximum luminous flux emitted by the first light emission zone 20D.
  • the total luminous flux ⁇ emitted by the light source 13 has for example a minimum value ⁇ min .
  • connection device 32 activates the first light emission zone 20D, as shown in diagram 72D.
  • the duty cycle R of application of the input electrical voltage U 0 across the first light zone 20D has for example a minimum value R min .
  • the adjustment member 30 regulates the average value of the electrical output voltage U1 which it supplies to the light source 13, by modifying the cyclical ratio R of application of the electrical voltage d input U 0 across the first light zone 20D. This regulation is done by progressive increase in the duty cycle R between the minimum value R min and a maximum value R max , as illustrated in diagram 72D.
  • the R min value is greater than a value equal to 5%, and the R max value is for example substantially equal to 100%.
  • the connection device 32 activates the second light emission zone 20E, as illustrated in diagram 72E.
  • the duty cycle R of application of the input electrical voltage U 0 across the second light zone 20E has for example a minimum value R min .
  • the cyclic ratio R of application of the input electrical voltage U 0 across the first light zone 20D is switched from its maximum value R max to its minimum value R min .
  • R max ⁇ R min . ⁇ min 20D R min . ⁇ min 20E ; with ⁇ min 20D , respectively ⁇ min 20E , the value of the luminous flux emitted by the first light zone 20D, respectively by the second light zone 20E, when the duty cycle R presents its minimum value R min .
  • the adjustment member 30 regulates the average value of the electrical output voltage U1 which it supplies to the light source 13, by modifying the cyclic ratio R of application of the electrical voltage d input U 0 across the first and second light zones 20D, 20E.
  • This regulation is done by progressive increase of the duty cycle R between the minimum value R min and the maximum value R max , as illustrated in diagrams 72D, 72E.
  • the connection device 32 activates the third light emission zone 20F, as illustrated in diagram 72F.
  • the duty cycle R of application of the input electrical voltage U 0 across the third light zone 20F has for example a minimum value R min .
  • the cyclic ratio R of application of the input electrical voltage U 0 across the first light zone 20D and the cyclic ratio R of application of the input electrical voltage U 0 across the second light zone 20E are each switched from their maximum value R max to their minimum value R min . For this continuity of total luminous flux to be obtained, the following condition must be verified: R max ⁇ R min .
  • ⁇ min 20D + ⁇ min 20E R min . ⁇ min 20F ; with ⁇ min 20D , ⁇ min 20E , respectively ⁇ min 20F , the value of the luminous flux emitted by the first light zone 20D, by the second light zone 20E, respectively by the third light zone 20F, when the cyclic ratio R presents its value minimum R min .
  • the adjustment member 30 regulates the average value of the electrical output voltage U1 which it supplies to the light source 13, by modifying the cyclical ratio R of application of the electrical voltage d input U 0 across the first, second and third light zones 20D, 20E, 20F. This regulation is done by progressive increase in the duty cycle R between the minimum value R min and the maximum value R max , as illustrated in diagrams 72D, 72E, 70F.
  • the total luminous flux ⁇ emitted by the light source 13 reaches a maximum value ⁇ max .
  • a principle for controlling the duty cycle identical or similar to that described above can be implemented in the case where the light source 13 defines on its substrate a number of light emission zones greater than or equal to two. The same principle of switching the duty cycle is then implemented, in order to ensure the continuity of the total luminous flux emitted by the light source 13 at the time of activation of new light zones.
  • the values of R min and R max may be different from one zone of the source to another. They can also be different for a given zone, from one stage of ignition to another.
  • the duty cycle R max is advantageously 100%, in particular for obtaining ⁇ max .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Semiconductor Lasers (AREA)
EP18719209.1A 2017-04-28 2018-04-27 Procédé et système de pilotage du courant électrique au sein d'une source lumineuse a semi-conducteur définissant au moins deux zones d'émission lumineuse distinctes Active EP3616471B1 (fr)

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FR1753786A FR3065822B1 (fr) 2017-04-28 2017-04-28 Procede et systeme de pilotage du courant electrique au sein d'une source lumineuse a semi-conducteur definissant au moins deux zones d'emission lumineuse distinctes
PCT/EP2018/060918 WO2018197686A1 (fr) 2017-04-28 2018-04-27 Procede et systeme de pilotage du courant electrique au sein d'une source lumineuse a semi-conducteur definissant au moins deux zones d'emission lumineuse distinctes

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EP (1) EP3616471B1 (zh)
KR (1) KR102271012B1 (zh)
CN (1) CN110583099B (zh)
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FR3062096B1 (fr) * 2017-01-26 2022-04-15 Valeo Vision Dispositif de controle d'une matrice de sources lumineuses pour l'eclairage interieure de l'habitacle d'un vehicule automobile
FR3124444B1 (fr) * 2021-06-23 2023-05-12 Valeo Vision Alimentation d’une matrice de sources lumineuses pour une fonction dynamique

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FR3065822A1 (fr) 2018-11-02
CN110583099B (zh) 2022-11-11
KR102271012B1 (ko) 2021-06-29
US11041598B2 (en) 2021-06-22
EP3616471A1 (fr) 2020-03-04
KR20190126933A (ko) 2019-11-12
CN110583099A (zh) 2019-12-17
WO2018197686A1 (fr) 2018-11-01
US20200149698A1 (en) 2020-05-14
FR3065822B1 (fr) 2020-08-28

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