• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention proposes a light device for a motor vehicle comprising means for controlling the supply of a plurality of light sources, the plurality of sources being divided into at least two groups of sources. The device according to the invention is remarkable in that each group of light sources fulfills a specific light function of the device and is distinguished by a need for electric current of a specific intensity. In addition, the control means are capable of selectively supplying each group of light sources exclusively to the other groups. A feeding method implementing the device according to the invention is also proposed.
    公开号:FR3035768A1
    申请号:FR1553889
    申请日:2015-04-29
    公开日:2016-11-04
    发明作者:Stephane Levasseur
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    [0001] The invention relates to the field of light devices of a motor vehicle, such as projectors using a plurality of sources. luminous, for example LED type, to realize several light functions of the motor vehicle. In the field of lighting devices for motor vehicles, it is interesting to be able to create the same optical signature for different light functions performed. For example it is useful that the position lights (PL, "position light") have a similar or similar appearance to the daytime running light (DRL), which nevertheless have a higher light output.
    [0002] It has been proposed to use the same light sources, for example of the light-emitting diode type, LED, to achieve such an objective. Depending on the type of source chosen, the diodes may indeed emit a more or less powerful light depending on the intensity of the electric current flowing through them. In known manner the LED power supply is controlled by a device which comprises a converter circuit, capable of converting an input voltage, typically supplied by the battery of the motor vehicle, into an output voltage of a different value, applied. LEDs mounted on the converter. However, such a solution is limited to the use of the same type of LED for the emission of a weak light and a strong light, while all the LEDs are not necessarily well adapted to multiple modes of operation .
    [0003] The invention aims to overcome at least one of the problems posed by the prior art. More specifically, the invention aims to provide a light device for a motor vehicle that uses a plurality of light sources divided into several groups, each group performing a specific light function, and each group being fed exclusively from other groups. The invention also aims to propose a feeding method using the device according to the invention. The invention relates to a light device for a motor vehicle comprising means for controlling the supply of a plurality of light sources, the plurality of sources being divided into at least two groups of sources. The device is remarkable in that each group is intended to fulfill a specific light function of the device and is distinguished by a need for electric current of a specific intensity for the realization of said light function. The device is furthermore remarkable in that the control means are capable of selectively supplying each of the groups of light sources exclusively to the other groups.
    [0004] The at least two groups of light sources may preferentially be separate groups. Preferably a first group of light sources may have a need for electric current of a first intensity, and a second group of light sources may have a need for electric current of a second intensity, the second intensity being less than the first. intensity. The light functions may advantageously be predetermined regulatory photometric functions. Preferably, the control means may comprise, for each group of light sources, a dedicated DC / DC converter which is capable of converting an input voltage into an output voltage. Each group of sources is mounted on one of the converters. Alternatively, the control means may preferably comprise a DC / DC converter adapted to convert an input electrical voltage into an output voltage, in charge of which each of the groups is switchable exclusively from the other groups by means of switching means. The switching means is configured to selectively switch one of the light source groups in charge of the converter, depending on a received signal of detection means. Said signal is representative of a value of the intensity of electric current flowing in the load-mounted electrical circuit of the converter and / or of the voltage value detected across said circuit. Advantageously, the groups of light sources and the switching means can be mounted on the same support, for example made by a printed circuit. The DC / DC converter and / or switching means may be arranged on a carrier separate from that of the light source groups.
    [0005] Preferably, the switching means may comprise a microcontroller element. The switching means may preferentially comprise for each group of light sources a switch element, preferably a transistor. The transistor may be of the field effect transistor type, FET and preferably a metal grid field effect transistor electrically isolated from the substrate by a dielectric oxide, MOSFET.
    [0006] The light source groups may preferably be arranged on parallel circuit branches to each other, the circuit being charged to the converter. Preferably, the switching means are in this case configured so as to allow the passage of electrical current in one of the branches of the mounting selectively and exclusively the other branches.
    [0007] Alternatively, the groups of light sources may be arranged on the same branch of a load-mounted circuit of the converter. In this case, the switching means are preferably configured to allow the passage of electrical current through the light sources of one of the source groups selectively, bypassing the sources of the other groups. Advantageously, the sources belonging to a group are connected in series sequentially. All groups can preferably be sequentially connected in series. Preferably, the detecting means may comprise a shunt resistor connected downstream of the light source groups and connected to ground. The resistor makes it possible to measure an indication of the intensity of the current flowing in the load-mounted circuit of the converter. The control means may preferably comprise at least one second converter for supplying at least one group of additional light sources. Advantageously, one of the groups of light sources can realize the "daytime running light" (DRL) function and a different group can perform the "position light" (PL) function. Advantageously, a group of additional light sources can realize the light function 3035768 4 "direction indicator" (Tl, Turn Indicator). This additional group can be mounted on the same support as the other groups of light sources. Preferably, the light sources may comprise light-emitting semiconductor chips, especially light-emitting diodes, LEDs, and / or power LEDs and / or laser diodes. The device according to the invention may preferably comprise an optical device for distributing the light emitted by each of the groups of light sources to perform said light functions. The optical device may comprise at least one optical lens. Preferably, the optical device may be a light guide having at least one input face for receiving light rays emitted from the light source groups and a common output face for performing said light functions. Preferably, the light sources of each of the groups can be arranged in the device so as to define an optical signature similar or identical to that defined by the other groups of light sources.
    [0008] The invention also relates to a method of supplying a group of light sources from a plurality of groups of light sources, each group implementing a specific light function of a light device of a motor vehicle and each group distinguished by a specific required power level. The method is remarkable in that it comprises the steps of: providing a device for controlling the supply of the light sources of the light device, comprising a DC / DC converter able to be controlled so as to provide a specific power supply depending on the required light function; 30 - detection, using detection means, a power supply level provided by the converter in a load-mounted electrical circuit of the converter; selecting and switching, by means of switching means, a group of light sources towards the load of the converter, the selected group corresponding to the group whose power supply level corresponds globally to the power supply level. detected.
    [0009] The device according to the invention has the advantage that it can perform several light functions of a motor vehicle while using standard converter circuits and without requiring a specific redevelopment thereof. The light sources of each of the groups are chosen so as to be able to best realize the light required by the light function that the group implements. According to preferred embodiments of the invention, a plurality of groups of light sources may in particular be powered by means of a single converter. Switching means separate from the converter, which can be realized at low cost by using simple electronic components, allow the modular design of such a device to be possible. Other features and advantages of the present invention will be better understood with the aid of the exemplary description and the drawings among which: FIG. 1 is a schematic representation of a preferred embodiment of the device according to the invention; FIG. 2 is a schematic representation of a preferred embodiment of the device according to the invention; FIG. 3 is a schematic representation of a preferred embodiment of the device according to the invention; FIG. 4 is a schematic representation of a preferred embodiment of the device according to the invention; FIG. 5 is a schematic representation of a preferred embodiment of the device according to the invention; FIG. 6 is a schematic representation of a preferred embodiment of the device according to the invention. In the following description, like reference numerals will be used to describe similar concepts through different embodiments of the invention. Thus, numbers 100, 200, 300, 400, 500 and 600 describe a device according to the invention in five different embodiments. Unless specifically indicated otherwise, technical features described in detail for a given embodiment may be combined with the technical features described in the context of other exemplary and non-limiting embodiments.
    [0010] FIG. 1 schematically shows a device 100 according to one embodiment of the invention. It is a luminous device for a motor vehicle. The parts of the device which do not have a direct link with the invention are not illustrated for the sake of clarity of the presentation. In particular the device is in known manner supplied with electricity 5 by a source of current internal to the motor vehicle, for example by the battery of the vehicle. Control means 110 for supplying a plurality of light sources are part of the device. These means may in known manner comprise at least one element or converter circuit, which is capable of converting an input voltage of a given value, into an output voltage of a different value. The converter may be of the boost (boost) or voltage buck (buck) type, or be in accordance with another architecture known to those skilled in the art, such as the "flyback" or "SEPIC" architecture. The operation of such converters is in itself known in the state of the art, it will not be described in more detail in the following. In the example shown, the control means 110 comprise two outputs and can provide two separate output voltages to two circuit branches mounted in load of the control means. Of course, the control means may also comprise a larger number of outputs without departing from the context of the present invention. Each of the charge branches comprises a group of light sources 120 respectively 122, illustrated by a single symbol in Fig. 1. Each of the groups 120, 122 preferably comprises a plurality of light sources, and the pluralities may comprise a number of light sources. different from elements. Each of the groups 120, 122 fulfills a specific light function of the device and is distinguished by a need for electric current of a specific intensity. For PL and DRL functions, for example, the current required by the group that implements the PL function is less than that required by the group that implements the DRL function. The means for controlling the supply of the light sources are configured so as to be able to selectively supply each of the groups of light sources exclusively to the other groups. For the example given above, this means that when the light sources that implement the PL function are turned on, the sources that correspond to the DRL function are turned off, and vice versa. The light sources of each group are preferably adapted to the needs of the light function that they implement. They may for example be light-emitting diodes. In what follows, the terms "light sources" and LEDs will be used equivalently, the LEDs being an example of light sources among others that fall within the context of the invention. The sources of each of the groups 120, 122 are preferably physically arranged to define an identical or similar optical signature. For example, the sources of the groups 120, 122 may be mounted on a support such as a printed circuit, PCB, alternating along a contour which defines the optical signature of the light device. Alternatively, the sources of groups 120, 122 may follow similar contours juxtaposed and brought closer to each other.
    [0011] FIG. 2 shows a particular embodiment of the invention, in which the device 200 comprises a DC / DC converter element or circuit 212, 214 per group of light sources connected to the control means 210. selectively and exclusively supplying one of the groups 220, 222. An unillustrated controller element may in particular be used to interpret a control signal received by the computer system of the motor vehicle and indicating the need to light, for example, the 220. On receiving such a signal, the controller element switches the converter 212 into "enable" mode of operation while all other converters pass or remain in "disable" off mode. Each of the converters is preferably configured and sized to provide a predetermined voltage and electrical current suitable for the light sources it is intended to power. The dimensions required in such embodiments are within the abilities of those skilled in the art. Figure 3 shows a preferred embodiment of the device according to the invention. The device 300 comprises control means 310 of the power supply of several groups of light sources 320, 322 exemplarily represented as LEDs. The control means 310 comprise an element or converter circuit 312 which is unique and common to the power supply of each of the groups 320, 322. The converter is in particular capable of supplying each of the groups 320, 322 with an electric current and a voltage. specific and adapted. Switching means 316 are provided and configured to be able to switch one of the groups 320, 322, which are respectively mounted on parallel circuit branches, towards the output of the converter. At a given moment, the only switched group in charge of the converter is supplied with electricity, while the other groups are not. The selection of the group 30 of light sources to be switched in charge of the converter is based on a signal relayed to the switching means 316 by detection means 318. These means, illustrated generically in Figure 3, are suitable to measure either an indication of the intensity of the electric current flowing in the load-mounted electrical circuit branch of the converter, or an indication of the electrical voltage across that circuit. Since each light function, and therefore each of the groups 320, 322 requires a voltage and a specific electric current, the detection means can thus indirectly detect the mode of operation of the converter at any time.
    [0012] During operation of the device, the control means 310 receive, for example through a computer system of the motor vehicle, a signal to turn on the group 320. The converter 312 is then controlled so as to provide a power supply. 5 which corresponds to the predetermined needs of the group 320. Regardless of the switching source group in charge of the switch, the detection means 318 detect the power supply level supplied by the converter and relay it to the switching means 316. The switching means are configured, for example using a microcontroller element not shown, to be able to retranslate the power supply level thus detected to the predetermined source group that corresponds to this power level. In the example given, it is the group 320, which is then switched to charge the converter. In practice, the group corresponding to the DRL function is connected to load by default.
    [0013] Preferably, the control means comprise a first table relating a light function to a power supply level to be supplied by the converter. The control of the converter is reflected by the input of the array determined by the desired light function. The switching means use a second switchboard which relates a detected power supply level to a specific source group. The group to switch in charge of the converter is found by identifying the input of the array that corresponds to the detected power level. By way of example, in the first table, a given light function A corresponds to a given power level B. When the function A is desired, the converter is controlled so as to supply the power supply B. In the second table , A detected level B 'corresponding to measurement errors near this power level B, corresponds to the group of sources C implementing the light function A. In this way, the same converter can be used to supply a plurality of groups sources with different power requirements, without the need to add complexity to the converter. The modularity is provided by the switching means that support the connection of the appropriate source group to the power supply, and therefore to the mode of operation of the converter, detected.
    [0014] FIG. 4 shows the example of FIG. 3, replacing, by way of example, the detection means described with a shunt resistor Rs indicated by reference 418. The resistor is connected on the one hand to a downstream node of all the source groups 420, 422 and on the other hand to the mass. In known manner, the voltage measured across the resistor can be used to deduce the intensity of the electric current flowing in the charged branch of the converter 412.
    [0015] FIG. 5 shows an embodiment 500 similar to those of FIGS. 3 and 4, with the difference that the source groups 520, 522 are connected in series on one and the same circuit branch. Although the light sources are illustrated as series-connected in groups, sources belonging to different groups can also alternate. In all cases, the switching means 516 are configured to short-circuit all the groups except the one identified by means of a selection device 517. The selection is carried out on the basis of the power level detected by the detection means 518 according to the detection principle described in the foregoing. The selection device may for example comprise a microcontroller element.
    [0016] Figure 6 schematically shows an example of an electronic circuit 600 which implements the embodiment just described. The source groups 620, 622 are connected in series on one and the same circuit branch. The power control means 610 comprise in particular a voltage regulator element 612 and switching means 616. The electronic components used are known in the art. In all the embodiments of the invention, the described switching means may be implemented by one or more microcontroller elements and / or by a switching circuit involving one or more switch elements such as transistors. in particular field effect transistors or MOSFET type. The switching means can be mounted on a common printed circuit with the light sources.
    [0017] In all embodiments of the invention, the luminous device advantageously comprises an optical device common to all groups of light sources, able to distribute or focus the light emitted by any of the groups. This is for example a light guide adapted to receive light rays by an input face, inside which the light rays are guided towards an exit face, through which they leave the guide.
    权利要求:
    Claims (15)
    [0001]
    REVENDICATIONS1. A light device (100; 200; 300; 400; 500) for a motor vehicle comprising control means (110; 210; 310; 410; 510) for supplying a plurality of light sources; the plurality of sources being divided into at least two source groups (120, 122, 220, 222, 320, 322, 420, 422, 520, 522) characterized in that each group is intended to fulfill a specific light function of the device and is distinguished by a need for an electric current of a specific intensity for carrying out said light function, and in that the control means (110; 210; 310; 410; 510) are capable of selectively supplying each of the source groups of light exclusively from other groups.
    [0002]
    2. Device (200) according to claim 1, characterized in that the control means (210) comprise for each group of light sources (220, 222) a dedicated DC / DC converter (212, 214) capable of converting an input voltage at an output voltage, each group of sources being charged to one of the converters.
    [0003]
    3. Device (300, 400, 500) according to claim 1, characterized in that the control means (310; 410; 510) comprise a DC / DC converter (312; 412; 512) adapted to convert an electrical voltage of input to an output voltage, in charge of which each of the groups (320, 322, 420, 422, 520, 522) is switchable exclusively from the other groups by means of switching means (316, 416, 516). ), said switching means being configured to selectively switch one of the light source groups in charge of the converter, in dependence on a received signal of detection means (318, 418, 518), said signal being representative of a value of the intensity of electric current flowing in the load-mounted electrical circuit of the converter and / or of the voltage value detected across said circuit.
    [0004]
    4. Device according to claim 3, characterized in that the switching means (316, 416, 516) comprise a microcontroller element. 3035768 11
    [0005]
    5. Device according to one of claims 3 or 4, characterized in that the switching means (316, 416, 516) comprise for each group of light sources a switch element, preferably a transistor. 5
    [0006]
    6. Device (300, 400) according to one of claims 3 to 5, characterized in that the groups of light sources are arranged on parallel circuit branches, the circuit being mounted in charge of the converter, and in that the means The switching devices (316, 416) are configured to permit the passage of electrical current in one of the branches of the mounting selectively and exclusively from the other branches.
    [0007]
    7. Device (500) according to one of claims 3 to 5, characterized in that the groups of light sources are arranged on the same branch of a load-mounted circuit of the converter, and in that the switching means (516 ) Are configured to permit the passage of electrical current through the light sources of one of the source groups selectively, bypassing the sources of the other groups.
    [0008]
    8. Device according to one of claims 3 to 7, characterized in that the detection means (318, 418, 518) comprise a shunt resistor connected downstream of the groups of light sources and connected to the ground, making it possible to measure an indication of the intensity of the current flowing in the load-mounted circuit of the converter. 25
    [0009]
    9. Device according to one of claims 3 to 8, characterized in that the control means comprise at least a second converter for supplying at least one group of additional light sources.
    [0010]
    10. Device according to one of claims 1 to 9, characterized in that one of the groups 30 of light sources performs the light function "daytime running light" (DRL, Daytime Running Light) and one of the groups carries out the light function "lights of position "(PL, Position Light).
    [0011]
    11. Device according to one of claims 1 to 10, characterized in that the light sources comprise light-emitting semiconductor chips, in particular light-emitting diodes, LEDs. 3035768 12
    [0012]
    12. Device according to one of claims 1 to 11, characterized in that the device comprises an optical device for distributing the light emitted by each group of light sources to perform said light functions. 5
    [0013]
    13. Device according to one of claims 1 to 12, characterized in that the light sources of each of the groups are arranged in the device so as to define an optical signature similar or identical to that defined by the other groups of light sources. 10
    [0014]
    A method of supplying a group of light sources from a plurality of groups of light sources, each group implementing a specific light function of a light device of a motor vehicle and each group being distinguished by a level of light. specific power supply required, including the steps of:
    [0015]
    Providing a device for controlling the supply of the light sources of the light device, comprising a DC / DC converter able to be controlled so as to supply a specific power supply in dependence on the required light function; detection, by means of detection means, of a power supply level supplied by the converter in a load-mounted electrical circuit of the converter; selecting and switching, by means of switching means, a group of light sources towards the load of the converter, the selected group corresponding to the group whose power supply level corresponds globally to the power supply level. detected.
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    法律状态:
    2016-04-28| PLFP| Fee payment|Year of fee payment: 2 |
    2016-11-04| PLSC| Publication of the preliminary search report|Effective date: 20161104 |
    2017-04-28| PLFP| Fee payment|Year of fee payment: 3 |
    2018-04-26| PLFP| Fee payment|Year of fee payment: 4 |
    2019-04-29| PLFP| Fee payment|Year of fee payment: 5 |
    2020-04-30| PLFP| Fee payment|Year of fee payment: 6 |
    2021-04-29| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1553889A|FR3035768B1|2015-04-29|2015-04-29|LUMINOUS DEVICE PROVIDING MULTIPLE LIGHT FUNCTIONS OF A MOTOR VEHICLE USING LIGHT SOURCE GROUPS DEDICATED BY FUNCTION|
    FR1553889|2015-04-29|FR1553889A| FR3035768B1|2015-04-29|2015-04-29|LUMINOUS DEVICE PROVIDING MULTIPLE LIGHT FUNCTIONS OF A MOTOR VEHICLE USING LIGHT SOURCE GROUPS DEDICATED BY FUNCTION|
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