• 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 power supply system for at least one semiconductor element light source of a motor vehicle. The system comprises means for controlling the power supply of said light source configured to supply an electric current to said light source, the intensity of the electric current supplied being a function of a BIN value of the source and the temperature of the light source. environment of the source. The system also comprises an electronic circuit independent of said light source, comprising a first component whose measurable characteristic is representative of said BIN value of the source, and a second component whose measurable characteristic is a function of the temperature of the environment of the source. light source. The invention is remarkable in that the control means are arranged to determine said characteristics of the first and second components via a single electrically conductive wire connecting the control means to the electronic circuit, and adapted to supply the latter with electric current.
    公开号:FR3064148A1
    申请号:FR1752121
    申请日:2017-03-15
    公开日:2018-09-21
    发明作者:Irantzu Jauregi；Silas Bakary；Samuel DAROUSSIN
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    064 148
    52121 ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:
    (to be used only for reproduction orders)
    ©) National registration number
    COURBEVOIE
    ©) Int Cl 8 : H 05 B 37/02 (2017.01)
    PATENT INVENTION APPLICATION
    A1
    ©) Date of filing: 03.15.17. ©) Applicant (s): VALEO VISION Joint-stock company ©) Priority: simplified - FR. ©) Inventor (s): JAUREGI IRANTZU, BAKARY SILAS and DAROUSSIN SAMUEL. (43) Date of public availability of the request: 21.09.18 Bulletin 18/38. ©) List of documents cited in the report preliminary research: Refer to end of present booklet @) References to other national documents (73) Holder (s): VALEO VISION Joint stock company related: folded. ©) Extension request (s): ©) Agent (s): VALEO VISION Limited company.
    DEVICE AND METHOD FOR DRIVING LIGHT SOURCES OF A MOTOR VEHICLE.
    FR 3 064 148 - A1
    The invention provides a power supply system for at least one light source with a semiconductor element of a motor vehicle. The system comprises means for controlling the electrical supply of said light source configured to supply an electric current to said light source, the intensity of the electric current supplied being a function of a BIN value of the source and of the temperature of the source environment. The system also comprises an electronic circuit independent of said light source, comprising a first component of which a measurable characteristic is representative of said BIN value of the source, and a second component of which a measurable characteristic is a function of the temperature of the environment of the light source. The invention is remarkable in that the control means are arranged to determine said characteristics of the first and second component via a single electrically conductive wire connecting the control means to the electronic circuit, and adapted to supply the latter with electric current.

    i
    DEVICE AND METHOD FOR DRIVING LIGHT SOURCES OF A MOTOR VEHICLE
    The invention relates to the field of lighting projectors, in particular for a motor vehicle. The invention relates in particular to a power supply system for the light sources of such a projector, the light sources being sources with a semiconductor element, the provision of BIN information of which is necessary for the configuration of the projector, and of which information on their temperature is necessary to supply a suitable electrical supply current.
    A light emitting diode, LED, is an electronic component capable of emitting light when it is traversed by an electric current. The light intensity emitted by an LED is generally dependent on the intensity of the electric current flowing through it. Among other things, an LED is characterized by a current intensity threshold value. This maximum forward current is generally decreasing at increasing temperature. Similarly, when an LED emits light, a voltage drop equal to its forward voltage is observed at its terminals. In the automotive field, LED technology is increasingly used for various light signaling solutions. LEDs are used to provide light functions such as daytime running lights, signaling lights, etc. LED components from the same production process may nevertheless have characteristics (emission capacity, direct voltage, ...) different. In order to group together the components having similar characteristics, the LEDs produced are sorted by groups, also called BINs, each BIN grouping together LEDs having similar characteristics.
    It is known in the art to use a control circuit to control the electrical supply of a set or group of LEDs. The circuit defines the electric current applied to a branch loaded and comprising the group of LEDs connected in series. In the field of lighting devices for motor vehicles, it is particularly important to be able to ensure constant brightness in order to guarantee the safety of vehicle users and those involved in road traffic. In order to provide a constant supply, known control circuits use different types of converters, DC / DC, linear, resistive, etc., to convert the direct electric current supplied for example by a car battery into a direct current of load, suitable for supplying the LEDs in question. The electric current to be supplied depends on the BIN of the LEDs to be supplied. This is why it is, according to known assembly methods, necessary to obtain the information from BIN which corresponds to the LEDs used, to program or correctly adjust the control circuit used to supply the LEDs with electric current.
    Likewise, the direct current of an LED depends on its semiconductor junction temperature. In known manner, the BIN information is coded using a resistor of a predetermined value, placed on the printed circuit which supports the LEDs in question, in isolation from the load branch which groups the light sources. An indication of the temperature of the LEDs can in a known manner be obtained by placing a thermistor element on a printed circuit in close physical proximity to the LEDs, the voltage drop across which being measurable. The control circuit for the supply of these LEDs is connected by dedicated connection wires to the printed circuit supporting the LEDs to obtain the value of the resistance in question, and to deduce therefrom the information of BIN and the information on the temperature. With the increasing number of light functions implemented by LEDs, the number of connection cables connecting the control circuit (s) of the power supply to the printed circuits supporting the LEDs in question therefore increases rapidly in order to relay the BIN information , temperature and others as required. This generates on the one hand significant costs during the production of headlights for motor vehicles, and on the other hand significant design constraints, since the limited space in which all the modules of a light device must be housed is seen restricted by this wiring.
    The invention aims to overcome at least one of the problems posed by the prior art. More specifically, the invention aims to reduce the number of connections between the power supply control circuit (s) and the printed circuits which support the light sources to be supplied, while ensuring that all the information is made available and characteristics of the light sources, necessary for the configuration of the control circuit (s).
    The invention relates to a power supply system for at least one light source with a semiconductor element of a motor vehicle. The system comprises means for controlling the electrical supply of said light source, configured to supply an electric current to said light source, the intensity of the electric current supplied being a function of a BIN value of the source and of the temperature of the source environment. The system also comprises an electronic circuit independent of said light source, comprising a first component of which a measurable characteristic is representative of said BIN value of the source, and a second component of which a measurable characteristic is a function of the temperature of the environment of the light source. The system is remarkable in that the control means are arranged to determine said characteristics of the first and second component via a single electrically conductive wire connecting the control means to the electronic circuit.
    Preferably, the single electrically conductive wire connecting the control means to the electronic circuit can be adapted to supply the latter with electric current.
    Preferably, the control means can comprise means for reading said characteristics of the first and second component. The reading means are configured for:
    at a first predetermined temperature, for which the characteristic of the second component is known, measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity passes through it;
    deducing the value of the characteristic of the first component from the measured voltage drop and the characteristic of the second component;
    recording the value of the characteristic of the first component, representative of the value B IN of the light source, in a first memory element.
    The first predetermined temperature is preferably an ambient temperature, preferably between 10 ° C and 40 ° C.
    The reading means can also be configured to:
    measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity passes through it;
    deducing the value of the characteristic second component from the measured voltage drop and the value of the characteristic of the first component, previously recorded in the first memory element;
    save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element.
    The electronic circuit may preferably include a parallel mounting of the first and the second component.
    Preferably, the electronic circuit can comprise a series connection of the first and of the second component.
    Preferably, the electronic circuit can comprise a parallel mounting of a first branch comprising the first component, and of a second branch comprising the second component. At least one of the branches comprises a selector assembly mounted in series and upstream of said first / second component, the selector assembly being configured to let an electric current pass through the electronic circuit selectively through said branch, according to a characteristic of the Electric power. The control means can preferably comprise means for reading said characteristics of the first and second component, configured to selectively inject an electric current having a predetermined characteristic into the electronic circuit.
    Each of the branches of the parallel circuit can preferably comprise a selector circuit respectively comprising a first and a second diode allowing only an electric current of a given polarity to pass, the diodes of the two branches allowing electric currents of opposite polarities to pass. The means for reading said characteristics of the first and second component may preferably be configured to:
    measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a first polarity passing through the first diode, crosses it;
    deducing the value of the characteristic of the first component from the measured voltage drop;
    recording the value of the characteristic of the first component, representative of the value B IN of the light source, in a first memory element.
    Preferably, the reading means can also be configured to:
    measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a second polarity, reverse of the first polarity and passing through the second diode, crosses it;
    deducing the value of the second component characteristic from the measured voltage drop;
    save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element.
    At least one of the branches of the parallel circuit can comprise a selector circuit which comprises a capacity allowing only an electric current of a predetermined frequency to pass, the frequencies for the two branches being different. The means for reading said characteristics of the first and second component may preferably be configured to:
    measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a first frequency passing the selector assembly of the first branch, crosses it;
    deducing the value of the characteristic of the first component from the measured voltage drop;
    recording the value of the characteristic of the first component, representative of the value B IN of the light source, in a first memory element.
    Preferably, the reading means can also be configured to:
    measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a second frequency passing through the selector assembly of the second branch, crosses it;
    deducing the value of the second component characteristic from the measured voltage drop;
    save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element.
    Preferably, only the first branch of the parallel circuit, comprising the first component having a characteristic representative of the BIN value of the light source, can comprise said selector circuit.
    The light sources may preferably include light-emitting diodes, LEDs, organic light-emitting diodes, OLEDs, or laser diodes.
    Preferably, the first component can be a resistor whose ohmic value is representative of the BIN value of the light source.
    Preferably, the second component can be a thermistor whose ohmic value depends on the temperature of the component. The resistance / temperature characteristics of the thermistor may preferably be pre-recorded in a memory element of the control means.
    Preferably, the thermistor may have a variable resistance which increases when its temperature increases. Alternatively, the resistance of the thermistor may decrease as its temperature increases.
    Preferably, the reading means can comprise a microcontroller element and / or an analog / digital converter.
    Preferably, the reading means can be connected to several electronic circuits each comprising components whose respective characteristics are representative of the BIN values and of the temperature of the environment of distinct light sources. The distinct light sources can preferably be adapted to perform distinct light functions of the motor vehicle.
    The invention also relates to a light module for a motor vehicle comprising at least one light source with a semiconductor element and a power supply system for said light source. The light module is remarkable in that the power supply system conforms to the invention.
    The invention also relates to a method of supplying electricity to at least one light source with a semiconductor element by means of a supply system in accordance with the invention, remarkable in that the means for controlling the supply of electricity comprise means for reading said characteristics of the first and second component. The process is remarkable in that it includes the following stages:
    a) at a first predetermined temperature, for which the characteristic of the second component is known, measure the voltage drop across said electronic circuit, when an electric current of a predetermined intensity passes through it;
    b) deducing the value of the characteristic of the first component from the measured voltage drop and the characteristic of the second component;
    c) recording the value of the characteristic of the first component, representative of the value B IN of the light source, in a first memory element;
    d) measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity passes through it;
    e) deducing the value of the second component characteristic from the measured voltage drop and the characteristic of the first component, previously recorded in the first memory element;
    f) record the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element;
    g) supplying an electric current to the light sources, the intensity of the electric current supplied being a function of the BIN value of the source and the temperature of the environment of the light source.
    Preferably, steps d) to g) can be repeated at predetermined times.
    The subject of the invention is also a method of supplying electrical power to at least one light source with a semiconductor element by means of a supply system according to the invention, in which the means for controlling the electrical supply include means for reading said characteristics of the first and second component and in which the electronic circuit comprises a parallel mounting of a first branch comprising the first component, and of a second branch comprising the second component. Each of the branches of the parallel circuit comprises a selector circuit mounted in series and upstream of said first / second component and respectively comprising a first and a second diode allowing only an electric current to pass through of a given polarity, the diodes of the two branches allowing it to pass electrical currents of opposite polarities. The process is remarkable in that it includes the following stages:
    aa) measure the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a first polarity passing through the first diode crosses it;
    bb) deducing the value of the characteristic of the first component from the measured voltage drop;
    ce) recording the value of the characteristic of the first component, representative of the value B IN of the light source, in a first memory element;
    dd) measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a second polarity, reverse of the first polarity and passing through the second diode, crosses it;
    ee) deducing the value of the second component characteristic from the measured voltage drop;
    ff) save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element;
    gg) supplying an electric current to the light sources, the intensity of the electric current supplied being a function of the BIN value of the source and the temperature of the environment of the light source.
    Preferably, steps dd) to gg) can be repeated at predetermined times.
    The subject of the invention is also a method of supplying electrical power to at least one light source with a semiconductor element by means of a supply system according to the invention, in which the means for controlling the electrical supply include means for reading said characteristics of the first and second component and in which the electronic circuit comprises a parallel mounting of a first branch comprising the first component, and of a second branch comprising the second component. At least one of the branches of the parallel circuit comprises a selector circuit connected in series and upstream of the first / second component, which comprises a capacity allowing only an electric current of a predetermined frequency to pass, the frequencies for the two branches being different. The method is remarkable in that it comprises the following steps: aaa) measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a first frequency passes through the selector assembly of the first branch, crosses it;
    bbb) deducing the value of the characteristic of the first component from the measured voltage drop;
    ccc) recording the value of the characteristic of the first component, representative of the value B IN of the light source, in a first memory element;
    ddd) measure the voltage drop across said electronic circuit, when an electric current of a predetermined intensity and a second frequency passing through the selector assembly of the second branch, crosses it;
    eee) deducing the value of the second component characteristic from the measured voltage drop;
    fff) save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element;
    ggg) supply an electric current to the light sources, the intensity of the electric current supplied being a function of the BIN value of the source and the temperature of the environment of the light source.
    Preferably, steps ddd) to ggg) can be repeated at predetermined times.
    By using the measures proposed by the present invention, it becomes possible to reduce the wiring between a device for controlling the power supply of light sources, and a printed circuit housing said light sources, compared to techniques known in the art. . In known manner, a first wiring is necessary to guarantee power supply of the light sources, and a second dedicated wiring is necessary to recover the BIN information of the light sources, which are for example light-emitting diodes, LEDs. Other additional multiple cabling becomes necessary in known solutions, if parameters such as the junction temperature of the LEDs must be taken care of at the level of the control device. Indeed, this information is necessary to control the power supply of the LEDs adequately. According to the invention, this third (or more) dedicated wiring becomes superfluous and can be eliminated, since the BIN, temperature or other information can be retrieved by the device for controlling the power supply by means of a single wiring. The reduction in wiring is particularly important in the context of the design of motor vehicle lights, or a control device may be required to supply several light functions of the vehicle, involving as much BIN, temperature and other information to be recovered. Reducing wiring reduces production cost and also reduces design concerns related to the electromagnetic compatibility of a light module. The number of connectors on either side of the wiring is reduced with the reduction in wiring.
    Other characteristics and advantages of the present invention will be better understood with the aid of the exemplary description and of the drawings among which:
    Figure 1 is a schematic representation of an electrical power system according to a preferred embodiment of the invention;
    Figure 2 is a schematic representation of an electronic circuit as it occurs in a power supply system according to a preferred embodiment of the invention;
    Figure 3 is a schematic representation of an electronic circuit as it occurs in a power supply system according to a preferred embodiment of the invention;
    Figure 4 is a schematic representation of an electronic circuit as it occurs in a power supply system according to a preferred embodiment of the invention;
    Figure 5 is a schematic representation of reading means and an electronic circuit as they occur in a power supply system according to a preferred embodiment of the invention;
    Figure 6 is a schematic representation of an electronic circuit as it occurs in a power supply system according to a preferred embodiment of the invention.
    Unless otherwise specified, technical characteristics described in detail for a given embodiment may be combined with technical characteristics described in the context of other embodiments described by way of example and not limitation. Similar reference numbers will be used to describe similar concepts across different embodiments of the invention. For example, the references 120, 220, 320, 420 and 520 designate an electronic circuit according to the invention, in five embodiments described.
    The illustration in FIG. 1 shows a power supply system 100 for at least one light source 10 with a semiconductor element. The light source (s) are preferably, but not limited to, light emitting diodes, LEDs. The LEDs 10 perform, for example, a light function of a motor vehicle within a light module of the motor vehicle. It can be a daytime running light, direction indicator, position light, etc.
    ίο
    The supply system 100 involves components known in a known manner which are not further illustrated components which are relevant for the description of the present description. Thus, the control means 110 generally involve converter circuits, for example of the buck, boost, SEPIC, or other type, adapted to convert a DC input voltage Vin, supplied for example by a battery internal to the motor vehicle, at a charge voltage of different value and adapted to the power supply of the LEDs.
    The power supply system according to the invention differs from known systems by the fact that a single conductor 130 connects reading means 112 to an electronic circuit 120 independent of the load branch which includes the light sources 10. The circuit electronics 120 houses a first component 122 of which a measurable characteristic is representative of said BIN value of the source, and a second component 124 of which a measurable characteristic is a function of the temperature of the environment of the LEDs. Preferably the first component 122 is a resistor Rbin whose ohmic value is representative of the BIN value of the source, and the second component 124 is a thermistor whose ohmic value is a function of the temperature of the component.
    The value BIN is necessary for the correct configuration of the control means 110 during the initialization of these, which is generally undertaken during the assembly of a projector which integrates the system 100 and the light source 10. By knowing the BIN value, the control means 110 are configured to supply an electric current of an intensity adapted to the LEDs 10. When the headlamp is operated in a motor vehicle, the temperature of the LEDs experiences variations due to external weather conditions to the vehicle, but also due to the heating of electronic components which is a consequence of their operation. As the semiconductor junction temperature of an LED changes its direct voltage, it is also necessary to provide an indication of this temperature to the control means, in order to adapt the charge current supplied to the LEDs 10. A thermistor placed at proximity of the LEDs, for example on the same printed circuit, makes it possible to obtain a representation of the temperature of the environment of the LEDs, which can be assimilated to their junction temperature.
    The behavior of the ohmic resistance of thermistor 124 as a function of its temperature is an inherent characteristic of the thermistor. This characteristic is known and is prerecorded in a memory element of the control means 110 or of the reading means 112. By using a single wire to recover the two pieces of information, the measurements according to the invention make it possible to facilitate the design of the supply system , while reducing the total cost of the components required.
    FIG. 2 shows a preferred embodiment of the electric circuit 220, connected by the single conductor 230 to the means for controlling the supply of LEDs, these latter two elements not being shown for reasons of clarity. The control means are arranged so as to be able to recover the data BIN, encoded by the resistor Rbin 222, and the temperature of the component 224, by means of the single connection wire 230. The electronic circuit 220 comprises a mounting in parallel of the two components 222 and 224. When assembling the projector, the temperature of the thermistor is equivalent to an amber temperature, preferably between 10 ° C and 40 ° C. The thermistor resistor is therefore known at this temperature. During assembly, the Rbin value, unknown at this time, must however be read by the reading means. Thus, an electric current of a predetermined intensity I is applied to the electronic circuit 220 by the control means. The voltage drop U observed makes it possible to obtain the value of the equivalent resistance Req of the electronic circuit 220, Req = U / I. As Req = (Rbin-Rntc) / (Rbin + Rntc), and as Rntc is known since the temperature at the time of the measurement is known, the reading means can therefore deduce the value Rbin from it. The value Rbin indicates the value of BIN of the LEDs and it is preferably stored in a memory element for use when configuring the control means. When the projector is operating, the Rbin value being now known, the temperature is an unknown quantity. By carrying out the procedure which has just been described, the value Rntc, which gives an indication of the temperature of the environment of the LEDs, is deduced from the value Req observed, and from the value Rbin now known. In order to carry out the calculations which have just been described, the reading means involve either a dedicated electronic circuit, or a microcontroller element programmed for this purpose, as well as an analog / digital converter. The reading of the temperature and the adaptation of the intensity of the electric current supplied to the LEDs, so that the latter emit constant light flux regardless of their junction temperature, is preferably carried out repeatedly, for example periodically during operation. of the system according to the invention.
    FIG. 3 shows another preferred embodiment of the electrical circuit 320, connected by the single conductor 330 to the means for controlling the supply of LEDs, these latter two elements not being shown for reasons of clarity. The control means are arranged so as to recover the BIN data, encoded by the resistor Rbin 322, and the temperature of the component 324 by means of the single connection wire 330. The electronic circuit 320 comprises a series connection of the two components 322 and 324. When assembling the projector, the temperature of the thermistor is equivalent to an ambient temperature, preferably between 10 ° C and 40 ° C. The resistance of the thermistor is therefore known at this temperature. During assembly, the Rbin value, unknown at this time, must however be read by the reading means. Thus, an electric current of a predetermined intensity I is applied to the electronic circuit 320 by the control means. The voltage drop U observed makes it possible to obtain the value of the equivalent resistance Req of the electronic circuit 320, Req = U / I. As Req = Rbin + Rntc, and as Rntc is known since the temperature at the time of the measurement is known, the reading means can therefore deduce the value Rbin from it. The value Rbin indicates the value of BIN of the LEDs and it is preferably stored in a memory element for use when configuring the control means. When the projector is operating, the Rbin value being now known, the temperature is an unknown quantity. By carrying out the procedure which has just been described, the value Rntc, which gives an indication of the temperature of the environment of the LEDs, is deduced from the value Req observed, and from the value Rbin now known.
    FIGS. 4 to 6 show other preferred embodiments according to the invention in which the electronic circuit 420, 520 involves a parallel mounting of a first branch comprising the first component, for example the resistance Rbin, and of a second branch comprising the second component, for example the NTC thermistor. At least one of the two branches comprises a selector assembly mounted in series and upstream of the first and / or second component. The selector assembly is configured to let an electric current pass through the electronic circuit selectively through the branch in question, according to a characteristic of the electric current. By configuring the control means so as to inject electrical currents with different characteristics at different reading instants, it then becomes possible to selectively read either the BIN information or the temperature information, using the single conductor 430 , 530 which connects the electronic circuit 420, 520 to the control means.
    In the embodiment illustrated by FIGS. 4 and 5, the electronic circuit 420 comprises the two branches mounted in parallel and respectively housing the first component Rbin 422, and the second component 424. Upstream of each of these components, each branch of the assembly includes a diode 421, 423. Each of the diodes allows an electric current of a single polarity to pass, and the two diodes allow electric currents of opposite polarities to pass through. Thus, by injecting an electric current having a first polarity which passes through the diode 421, but which does not pass through the diode 423, the reading means are able to recover the value Rbin by observing the voltage drop induced by the component 422 Likewise, by injecting an electric current having a second polarity, inverse to the first polarity, which passes through diode 423, but which does not pass through diode 421, the reading means are capable of recovering the value Rntc by observing the voltage drop induced by component 424. Thus, when assembling the projector, the BIN value is recovered by selectively injecting an electric current having the appropriate polarity, and during the operation of the projector, the temperature value of the environment of the LEDs is recovered by selectively injecting an electric current having a reverse polarity. FIG. 5 shows in an exemplary manner reading means 412 configured to selectively inject an electric current having either a positive or negative polarity in the electronic circuit 420. Obviously, a person skilled in the art will know how to implement different electronic circuits to achieve the same functionality, without departing from the scope of the present invention.
    In the embodiment illustrated in FIG. 6, the electronic circuit 520 comprises the two branches mounted in parallel and respectively housing the first component Rbin 522, and the second component 524. Upstream of the component 522, the assembly comprises a capacitor 525. The capacity only allows an electric current having a predetermined frequency to pass, depending on the value and the capacity. When a direct current crosses the electronic circuit 520, the component 522 is therefore not supplied with electric current. Thus, by injecting an electric current having the required frequency - for example a clock signal - which passes through the capacity 525, the reading means are capable of recovering the value Rbin by observing the voltage drop induced by the component 522. At temperature, the value of Rbin is comparable to the equivalent resistance of circuit 520, while Rntc (known at ambient temperature) is negligible compared to Rbin. Similarly, by injecting a direct electric current, which passes only through the component 524, the reading means are capable of recovering the value Rntc by observing the voltage drop induced by the component 424. Thus, when assembling the projector, the BIN value is recovered by selectively injecting an electric current having the adapted frequency, and during operation of the projector, the value of the temperature of the environment of the LEDs is recovered by selectively injecting a direct electric current. Alternatively, capacitors with different values can be placed on the two branches, so that electric currents with different frequencies are used to recover the BIN and temperature information respectively.
    It goes without saying that it presents that other electronic circuits which implement the described functionalities can be envisaged, without departing from the scope of the present invention. Likewise, the principles described can be extended to the encoding and recovery of more than two characteristics of the light sources using the electronic circuit according to the invention.
    权利要求:
    Claims (4)
    [1]
    Claims
    1. Power supply system (100) for at least one light source (10) with a semiconductor element of a motor vehicle, the system comprising:
    means for controlling the electrical supply (110) of said light source, configured to supply an electric current to said light source, the intensity of the electric current supplied being a function of a BIN value of the source and of the temperature of the source environment;
    an electronic circuit (120, 220, 320, 420, 520) independent of said light source, comprising a first component (122, 222, 322, 422, 522), a measurable characteristic of which is representative of said BIN value of the source, and a second component (124, 224, 324, 424, 524), a measurable characteristic of which is a function of the temperature of the environment of the light source, characterized in that the control means (110) are arranged to determine said characteristics of the first and second component via a single wire (130, 230, 330, 430, 530) electrically conductive connecting the control means (110) to the electronic circuit (120, 220, 320, 420, 520).
    [2]
    2. System according to claim 1, characterized in that the control means (100) comprise means of reading (112) of said characteristics of the first (122, 222, 322) and second (124, 224, 324) components, configured for :
    at a first predetermined temperature, for which the characteristic of the second component is known, measuring the voltage drop across said electronic circuit (120, 220, 320), when an electric current of a predetermined intensity passes through it;
    deducing the value of the characteristic of the first component from the measured voltage drop and the characteristic of the second component; recording the value of the characteristic of the first component, representative of the BIN value of the light source, in a first memory element.
    [3]
    3. System according to claim 2, characterized in that the reading means (112) are further configured for:
    measuring the voltage drop across said electronic circuit (120, 220, 320), when an electric current of a predetermined intensity passes through it; deducing the value of the characteristic second component from the measured voltage drop and the value of the characteristic of the first component, previously recorded in the first memory element;
    save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element.
    System according to one of claims 1 to 3, characterized in that the electronic circuit (220) comprises a parallel mounting of the first (222) and the second component (224).
    System according to one of claims 1 to 3, characterized in that the electronic circuit (320) comprises a series connection of the first (322) and the second (324) component.
    System according to claim 1, characterized in that the electronic circuit (420, 520) comprises a parallel connection of a first branch comprising the first component (422, 522), and of a second branch comprising the second component (424 , 524), at least one of the branches comprising a selector assembly (421, 423, 525) mounted in series and upstream of said first / second component, the selector assembly being configured to let an electric current pass through the electronic circuit (420, 520) selectively by said branch, as a function of a characteristic of the electric current, and in that the control means comprise means of reading (412) of said characteristics of the first and second component, configured to selectively inject a electric current having a predetermined characteristic in the electronic circuit.
    System according to claim 6, characterized in that each of the branches of the parallel circuit comprises a selector circuit (421, 423) respectively comprising a first and a second diode allowing only an electric current of a given polarity to pass, the diodes of the two branches allowing electrical currents of opposite polarities to pass, and in that the reading means (412) of said characteristics of the first (422) and second (424) component are configured for:
    measuring the voltage drop across said electronic circuit (420), when an electric current of a predetermined intensity and a first polarity passing through the first diode, crosses it;
    deducing the value of the characteristic of the first component from the measured voltage drop;
    recording the value of the characteristic of the first component, representative of the BIN value of the light source, in a first memory element.
    System according to claim 7, characterized in that the reading means are further configured for:
    measuring the voltage drop across said electronic circuit (420), when an electric current of a predetermined intensity and a second polarity, reverse of the first polarity and passing through the second diode, crosses it; deducing the value of the second component characteristic (424) from the measured voltage drop;
    save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element.
    System according to claim 6, characterized in that at least one of the branches of the parallel circuit comprises a selector circuit (525) which comprises a capacity allowing only an electric current to pass through a predetermined frequency, the frequencies for the two branches being different , and in that the means for reading said characteristics of the first (522) and second (524) component are configured for:
    measuring the voltage drop across said electronic circuit (520), when an electric current of a predetermined intensity and a first frequency passing the selector assembly of the first branch, crosses it;
    deducing the value of the characteristic of the first component (522) from the measured voltage drop;
    recording the value of the characteristic of the first component, representative of the BIN value of the light source, in a first memory element.
    System according to claim 9, characterized in that the reading means are further configured for:
    measuring the voltage drop across said electronic circuit (520), when an electric current of a predetermined intensity and a second frequency passing through the selector assembly of the second branch, crosses it; deducing the value of the second component characteristic (524) from the measured voltage drop;
    save the value of the characteristic of the second component, representative of the temperature of the environment of the light source at the time of the measurement, in a second memory element.
    11. System according to one of claims 9 or 10, characterized in that only the first branch of the parallel circuit, comprising the first component (524) having a characteristic representative of the BIN value of the light source, comprises said selector circuit ( 525).
    12. System according to one of claims 1 to 11, characterized in that the first component (122, 222, 322, 422, 522) is a resistor whose ohmic value is representative of the BIN value of the light source.
    13. System according to one of claims 1 to 12, characterized in that the second component (124, 224, 324, 424, 524) is a thermistor whose ohmic value depends on the temperature of the component.
    14. Light module for a motor vehicle comprising at least one source
    15 light (10) with semiconductor element and an electrical supply system (100) of said light source, characterized in that the electrical supply system conforms to one of claims 1 to 13.
    Method for supplying electrical power to at least one light source (10) with semiconductor element by means of a supply system (100) according to claim 1, characterized in that the means for controlling the electrical supply (110) comprise means for reading (112) of said characteristics of the first (122, 222, 322) and second (124, 224, 324) component, and in that the method comprises the following steps:
    a) at a first predetermined temperature, for which the characteristic of the second component (124, 224, 324) is known, measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity passes through it;
    b) deducing the value of the characteristic of the first component (122, 222, 322) from the measured voltage drop and the characteristic of the second component;
    c) recording the value of the characteristic of the first component, representative of the BIN value of the light source, in a first memory element;
    d) measuring the voltage drop across said electronic circuit, when an electric current of a predetermined intensity passes through it;
    e) deducing the value of the characteristic second component (124, 224, 324) from the measured voltage drop and the characteristic of the first component, previously recorded in the first memory element;
    f) record the value of the characteristic of the second component, representative
    [4]
    5 of the temperature of the environment of the light source at the time of measurement, in a second memory element;
    g) supplying an electric current to the light sources, the intensity of the electric current supplied being a function of the BIN value of the source and the temperature of the environment of the light source.
    1/2
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    同族专利:
    公开号 | 公开日
    FR3064148B1|2021-07-16|
    EP3376832B1|2020-01-01|
    CN108633132B|2021-06-29|
    EP3376832A1|2018-09-19|
    CN108633132A|2018-10-09|
    US20180270927A1|2018-09-20|
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    DE102013226964A1|2013-12-20|2015-06-25|Tridonic Gmbh & Co Kg|LED driver for reading information from an LED module|WO2021170842A1|2020-02-27|2021-09-02|Valeo Vision|Automotive luminous arrangement|DE10230154A1|2002-07-04|2004-01-15|Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH|supply unit|
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    US9326346B2|2009-01-13|2016-04-26|Terralux, Inc.|Method and device for remote sensing and control of LED lights|
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    法律状态:
    2018-03-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-09-21| PLSC| Publication of the preliminary search report|Effective date: 20180921 |
    2020-03-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-03-30| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1752121A|FR3064148B1|2017-03-15|2017-03-15|DEVICE AND METHOD FOR CONTROL OF LIGHT SOURCES OF A MOTOR VEHICLE|
    FR1752121|2017-03-15|FR1752121A| FR3064148B1|2017-03-15|2017-03-15|DEVICE AND METHOD FOR CONTROL OF LIGHT SOURCES OF A MOTOR VEHICLE|
    EP18160481.0A| EP3376832B1|2017-03-15|2018-03-07|Device and method for controlling light sources of a motor vehicle|
    CN201810216211.7A| CN108633132B|2017-03-15|2018-03-15|Device and method for controlling a light source of a motor vehicle|
    US15/921,905| US20180270927A1|2017-03-15|2018-03-15|Device and method for controlling light sources of a motor vehicle|
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