• 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:
    Luminous module (4) for a motor vehicle headlight and power supply circuit (5) for the light module (4), wherein the power supply circuit (5) has a control unit (3) for outputting a constantly regulated supply current (Iv) to at least one light source (D1, D2, Dn) of the lighting module (4) and the control unit (3) at least three electrical connections (A1 '', A2 '', A3 '') for connection to the electrical connections (A1 ', A2', A3 ') of the lighting module (4) wherein the control unit (3) is adapted to conduct at least a portion of the supply current (Iv) via the shunt resistor (Rsext) towards the at least one light source (D1, D2, Dn) and the voltage difference applied to the shunt resistor (Rsext) (URsext), whereby the voltage difference (URsext) at the shunt resistor (Rsext) is regulated to a constant value for controlling the current (Iv).
    公开号:AT517629A1
    申请号:T50751/2015
    申请日:2015-09-02
    公开日:2017-03-15
    发明作者:Graf Thomas
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    LED current coding by extended shunt resistor
    The invention relates to a lighting module for a motor vehicle lighting device, in particular for a motor vehicle headlight. Furthermore, the invention relates to a power supply circuit for a lighting module, a circuit arrangement comprising a lighting module and a power supply circuit and a motor vehicle headlight and a motor vehicle comprising the circuit arrangement.
    Lighting modules according to the prior art have light sources that can be supplied with an external power supply device. The luminous flux emitted by such luminous modules is predetermined by the absorbed power as well as by the number and efficiency of the light sources installed on the luminous module. Lighting modules for the automotive industry, especially for use with headlamps, are often produced in different brightness classes. In most cases, lighting modules are produced in three brightness classes, to each of which light sources with a certain efficiency are assigned. If lighting modules of different brightness classes are supplied with the same supply current, the result is that the amount of light emitted by the lighting modules is different. When installed in a vehicle headlight, this would have the undesirable effect that only a single light module could be used for a vehicle headlight with a given light image, since the replacement of a light module of a different brightness class would change the intensity of the radiated light.
    In order to counteract this problem, a coding resistor is provided in lighting modules according to the prior art, which is detected by a corresponding to the light module power supply circuit or evaluated by an arranged on the power supply unit evaluation, depending on the value of Kodierwiderstandes on the brightness class of the light sources is concluded. By adapting the supply current (for example 0.6 A to 1A) to the respective brightness class of the lighting module, it is possible to operate lighting modules of different brightness class such that the light image emitted by a lighting module for lighting modules of different brightness classes largely coincides. This can, for example, the number of for one
    Motor vehicle headlights suitable lighting modules can be increased. However, before seeing a Kodierwiderstandes represents a certain amount of effort, since the light module must be equipped with the resistor and also electrical connections must be provided, via a contact by the evaluation of the
    Power supply unit can be done. In addition, the power supply unit must have the evaluation unit and a control unit which is in communication with the evaluation unit and is set up to set an output voltage or an output current depending on the measurement result of the evaluation unit. Consequently, the information transfer from the light module to the control unit has been a costly effort.
    It is therefore an object of the invention to provide a lighting module by means of which the disadvantages of the prior art can be overcome. This object is achieved with a light module of the type mentioned, in which a shunt resistor and at least one at least partially electrically provided via the shunt resistor light source are provided according to the invention, wherein the light module further comprises at least three electrical connections, wherein a first terminal and a second terminal for electrical contacting of the shunt resistor and a third connection for electrical contacting of the downstream at least one light source is provided, wherein the electrical connections are designed as externally contactable connections.
    Thanks to the invention, it is possible to completely dispense with coding means or associated evaluation units according to the prior art and to image the brightness class of a lighting module directly in the supply path of the light sources. The shunt resistor is dimensioned so that adjusts the voltage at the shunt resistor, the desired supply current, which flows through the downstream light sources. The voltage difference at the shunt resistor can be measured via the first and the second contact and fed as a control variable of a control unit of a power supply circuit. The resistance value of the shunt resistor has a significant influence on the supply current. For example, with a regulation to a voltage difference of 0.1 V at the shunt resistor at a resistance value of 0.1 Ω, a current in the amount of 1A can be specified via the shunt resistor.
    In particular, it can be provided that the lighting module has at least two, three or more than three light sources.
    In addition, it can be provided that the at least one light source is an LED, an OLED or a laser diode. Variants are also conceivable in which a plurality of LEDs, OLEDs and / or laser diodes are used.
    In particular, it can be provided that the shunt resistor has a value between 0.2Ω and 2Ω, preferably between 0.3Ω and 1.5Ω, more preferably between 0.5Ω and 1Ω.
    In order to enable a particularly compact simple construction of the light module, it can be provided that the shunt resistor, the at least one light source and the at least three terminals on a common circuit substrate, preferably a printed circuit board, are arranged.
    Another aspect of the invention relates to a power supply circuit for a light module according to one of the preceding claims, comprising a control unit for outputting a constant regulated supply current to the at least one light source of the light module, wherein according to the invention, the control unit at least three electrical connections for connection to the electrical terminals of the light module wherein the control unit is adapted to direct at least a portion of the supply current through the shunt to the at least one light source and to measure the voltage difference across the shunt resistor, the voltage difference across the shunt resistor being at a constant value, for example between 0.05V and 0.5V, preferably between 0.1V and 0.3V.
    The term "voltage difference at the shunt resistor" is understood to mean the voltage which drops due to the current flow through the shunt resistor at the latter, ie lies between the first and the second connection.
    In particular, it can be provided that the supply current is conducted completely via the shunt resistor. In this case, the power supply circuit is free of current paths that are connected in parallel with the shunt resistor.
    Alternatively, it can be provided that the control unit has an auxiliary resistor, which is connected in parallel to the shunt resistor. The supply current is then divided according to the conductivities of the resistors on this. By regulating to a constant voltage value at the parallel circuit consisting of shunt resistor and auxiliary resistor, the supply current is given by the quotient of the voltage drop across the parallel circuit and the equivalent resistance of the parallel circuit. The supply current can therefore be set in a simple manner when regulating to a predetermined voltage drop at the parallel circuit by setting the equivalent resistance, in particular the shunt resistor.
    In particular, it can be provided that the auxiliary resistor has a value between Ο, ΙΩ and 2Ω, preferably between 0.15Ω and 1Ω, more preferably between 0.2Ω and 0.75Ω.
    It can be particularly favorable when the control unit for regulating a supply current output to the light module or the output voltage Ua correlating thereto has a transistor switch connected in series with the light module and a capacitor connected in parallel.
    In a further aspect, the invention relates to a circuit arrangement comprising a luminous module according to the invention and an inventive luminous module
    Power supply circuit for supplying power to the light module.
    Moreover, the invention relates to a motor vehicle lighting device, in particular a motor vehicle headlight, comprising at least one lighting module and / or a power supply circuit and / or a circuit arrangement according to the invention. Under a motor vehicle lighting device are any lighting devices understood that are used for signal lighting and / or lighting purposes in motor vehicles. Examples of motor vehicle lighting devices are motor vehicle taillights or tail lights, interior lighting, daytime running lights,
    Turn signals, bow lights, fog lights, headlights, bow lights, reversing lights, marker lights etc ..
    Furthermore, the invention relates to a motor vehicle, comprising at least one, preferably two motor vehicle headlamps according to the invention.
    The invention is explained in more detail below with reference to an exemplary and non-limiting embodiment, which is illustrated in the figures. It shows
    Figure 1 is a schematic representation of a circuit arrangement according to the prior art, and
    Figure 2 is a schematic representation of a circuit arrangement according to the invention
    In the following figures, unless otherwise stated, like reference numerals designate like features.
    Figure 1 shows a schematic representation of a circuit arrangement according to the prior art. The circuit arrangement comprises a dampening module 4 and a power supply circuit 5 supplying the dampening module 4. As described in the introduction, the dampening module 4 has a plurality of sprue sources D1, D2 to Dn which are connected via the connections A1 'and A2' by corresponding connections A1 "and A2" Power supply device 5 can be supplied. The dampening module has a coding resistor Rc, which can be contacted and evaluated via specially designed connections A3 'and A4', an evaluation unit 2 arranged on the power supply device 5. Each brightness class is assigned a coding resistor, so that the brightness class of the wet module 4 can be deduced by evaluating the resistance value and a suitable supply current can be set. For this purpose, the evaluation unit 2 is connected to the control unit 3. For supplying the power supply device 5, a supply unit 1, for example a voltage source, is provided.
    FIG. 2 shows a schematic representation of a circuit arrangement according to the invention, comprising a damp module 4 according to the invention and a circuit according to the invention
    Energy supply circuit 5 for supplying the light module 4. The light module 4 has, in contrast to the prior art, a shunt resistor Rsext and at least one at least partially electrically powered via the shunt resistor Rsext light source, in the present example, three light sources Dl, D2 to Dn are shown. As indicated by the dashed line, the number of light sources may also differ from the number shown. In this embodiment, light-emitting diodes were used as light sources. The lighting module 4 has three electrical connections Al ', A2' and A3 ', wherein the connections Al' (first connection) and A2 '(second connection) are provided for electrically contacting the shunt resistor Rsext. The third terminal A3 'is provided for electrically contacting the light sources Dl to Dn, wherein the terminals Al' to A3 'are designed as externally contactable terminals to be contacted by the power supply device 5.
    The power supply device 5 is set up to output a constant supply current to the light sources D1 to Dn. For this purpose, the power supply device has a control unit 3 for outputting a constantly regulated supply current Iv to the light sources D 1 to Dn of the lighting module 4.
    In the exemplary embodiment shown, the supply current Iv is composed of two parts, namely that which flows via the shunt resistor Rsext (Kse) and that which flows via an auxiliary resistor Rs (Irs). The power supply unit 5 has at least three electrical connections Al ", A2" and A3 ", which correspond to the electrical connections of the lighting module 4. The control unit 3 is set up to apply the voltage difference URSext applied to the shunt resistor Rsext (ie the electrical potential difference between the connections For example, a transistor switch T can be controlled via a PWM signal, so as to ensure that an output voltage Ua is present between the terminals Al 'and A3' such that a desired voltage value (for example 0.1 V or 0.2 V) and therefore a desired current are established at the resistor Rsext. The output voltage Ua can be supported by a capacitor C.
    The auxiliary resistor Rs is typically part of the power supply circuit 5 and connected in parallel with the shunt resistor Rsext and thus relieves the shunt resistor Rsext. In principle, this auxiliary resistor Rs is not absolutely necessary - the use of such a resistor, however, has proven itself for practical reasons. It is essential in the invention that the shunt resistor Rsext influences the total resistance and thus influences the value of the current impressed into the light sources D1 to Dn.
    The power supply device 5 must therefore be connected to the lighting module 4 in such a way that it is ensured that at least a portion of the total supply current Iv flows via the shunt resistor Rsext. The shunt resistor Rsext is adapted to the brightness of the respective light sources Dl to Dn and ensures that light modules 4 of different brightness classes are operated with different current levels, so that the brightness differences between the light modules 4 can be compensated. This makes it possible to operate lighting modules 4 of different brightness class by similar energy supply devices 5 with the same brightness and at the same time to dispense with the provision of an externally to be contacted coding resistor Rc and an associated evaluation unit 2. It is therefore possible to continue to use light modules 4 of different brightness class, for example for a vehicle headlight.
    In view of this teaching, one skilled in the art will be able to arrive at other, not shown embodiments of the invention without inventive step. The invention is therefore not limited to the embodiment shown. Also, individual aspects of the invention or the embodiment can be taken up and combined with each other. The light module 4 and the power supply circuit 5 relate to a common inventive idea. Essential are the ideas underlying the invention, which can be performed by a person skilled in the knowledge of this description in a variety of ways and still remain maintained as such.
    权利要求:
    Claims (13)
    [1]
    claims
    1. light module (4) for a motor vehicle headlight, characterized by a shunt resistor (Rsext) and at least one at least partially via the shunt resistor (Rsext) electrically supplied light source (Dl, D2, Dn), wherein the light module (4) further comprises at least three electrical connections (Al ', A2', A3 '), wherein a first terminal (Al') and a second terminal (A2 ') for electrically contacting the shunt resistor (Rsext) and a third terminal (A3') for electrically contacting the downstream at least a light source (Dl, D2, Dn) is provided, wherein the electrical connections (Al ', A2', A3 ') are designed as externally contactable terminals.
    [2]
    Second lighting module (4) according to claim 1, characterized in that the lighting module (4) has at least two, three or more than three light sources (Dl, D2, Dn).
    [3]
    3. light module (4) according to claim 1 or 2, characterized in that the at least one light source (Dl, D2, Dn) is an LED, an OLED or a laser diode.
    [4]
    4. light module (4) according to any one of the preceding claims, characterized in that the shunt resistor (Rsext) has a value between 0.2Ω and 2Ω, preferably between 0.3Ω and 1.5Ω, more preferably between 0.5Ω and 1Ω.
    [5]
    5. lighting module (4) according to one of the preceding claims, characterized in that the shunt resistor (Rsext), the at least one light source (Dl, D2, Dn) and the at least three terminals (Al ', A2', A3 ') on a common circuit carrier, preferably a printed circuit board, are arranged.
    [6]
    6. Energy supply circuit (5) for a light module (4) according to one of the preceding claims, comprising a control unit (3) for outputting a constantly regulated supply current (Iv) to the at least one light source (Dl, D2, Dn) of the light module (4) , characterized in that the control unit (3) at least three electrical connections (Al ", A2", A3 ") for connection to the electrical connections (Al ', A2', A3 ') of the lighting module (4), wherein the control unit (3) is arranged to conduct at least a portion of the supply current (Iv) via the shunt resistor (Rsext) towards the at least one light source (Dl, D2, Dn) and to measure the voltage difference (URSext) applied to the shunt resistor (Rsext) , wherein for controlling the current (Iv), the voltage difference (URSext) on the shunt resistor (Rsext) is regulated to a constant value.
    [7]
    7. power supply circuit (5) according to claim 6, characterized in that the supply current (Iv) is passed completely through the shunt resistor (Rsext).
    [8]
    8. Energy supply circuit (5) according to claim 6, characterized in that the control unit (3) has an auxiliary resistor (Rs) which is connected in parallel with the shunt resistor (Rs ext).
    [9]
    9. Energy supply circuit (5) according to claim 8, characterized in that the auxiliary resistance (Rs) has a value between Ο, ΙΩ and 2Ω, preferably between 0.15 Ω and 1Ω, more preferably between 0.2 Ω and 0.75 Ω , having.
    [10]
    10. Energy supply circuit (5) according to one of claims 6 to 9, characterized in that the control unit (3) for controlling a light output to the module (4) supply current (Iv) to the light emitting module (4) serially connected transistor switch (T ) and a parallel-connected capacitor (C) has.
    [11]
    11. Circuit arrangement, comprising a lighting module (4) according to any one of claims 1 to 5 and a power supply circuit (5) for the power supply of the lighting module (4) according to one of claims 6 to 10.
    [12]
    12. Motor vehicle lighting device, in particular motor vehicle headlight, comprising at least one light module (4) and / or a power supply circuit (5) and / or a circuit arrangement according to one of the preceding claims.
    [13]
    13. Motor vehicle, comprising at least one, preferably two motor vehicle headlights according to claim 12.
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
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    US15/752,289| US20180237092A1|2015-09-02|2016-08-29|Energy supply circuit for a lighting module|
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    EP16766217.0A| EP3345458A1|2015-09-02|2016-08-29|Energy supply circuit for a lighting module|
    CN201680050609.7A| CN107926092B|2015-09-02|2016-08-29|Energy supply circuit for lighting module|
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