• 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:
    A motor vehicle lighting device having at least two semiconductor light sources for generating a light distribution, in which a lighting device associated circuitry for driving at least two modulation branches (Z1 ... Zn) for semiconductor light sources (LD1 ... .LDn) is provided, each branch has at least one semiconductor light source, which is in series with a modulation stage (111, 112, ... 11n), which modulates the current in the respective branch, and the branches are parallel to the output voltage (UA) of a common, electronically controllable voltage source (10), and an evaluation circuit (121 , 122, ... 12n) is provided, to which the voltage drop (ux1, ... .. uxn) is fed at the modulation stage of each branch, wherein the evaluation circuit is adapted to the current minimum value (uxmin) of the voltage drop (ux1 , ... ..ux) to supply a control stage (13) as an actual value, wherein the control stage as Sollw ert the minimum required voltage drop (usoll) is given and the output signal (SA) of the control stage is supplied as a control variable for the voltage control of the controllable voltage source.
    公开号:AT518685A1
    申请号:T50523/2016
    申请日:2016-06-07
    公开日:2017-12-15
    发明作者:Mitterlehner Thomas；Koller Jan；Schantl Patrik
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    Motor vehicle lighting device
    The invention relates to a motor vehicle lighting device with at least two semiconductor light sources for generating a light distribution, in which a lighting device associated circuitry is provided for driving at least two modulation branches for semiconductor light sources, each branch has at least one semiconductor light source, which in series with a modulation stage is located, which modulates the current in the respective branch, and the branches are parallel to the output voltage of a common, electronically controllable voltage source.
    In the development of the current headlamp systems is increasingly the desire in the foreground to project a high-resolution as possible on the road, which can be quickly changed and adapted to the respective traffic, road and lighting conditions. The term "carriageway" is used here for a simplified representation, because of course it depends on the local conditions, whether a photo is actually on the roadway or extends beyond it.In principle, the photograph in the sense used here corresponds to a projection on a vertical Area according to the relevant standards, which refer to the automotive lighting technology.Often, one speaks of "traffic lane" also of "traffic light".
    According to the aforementioned need, different headlamp systems have been developed, such as headlamps operating with scanning modulated laser beams, where the lighting starting point is at least one laser light source emitting a laser beam and associated with a laser driver used for powering and monitoring the laser emission or e.g. is used for temperature control and is also set up to modulate the intensity of the emitted laser beam. By "modulating" it is to be understood that the intensity of the laser light source can be changed, whether pulsed continuously or in the sense of switching on and off. It is essential that the light output can be changed dynamically analogously, depending on which angular position a mirror deflecting the laser beam is. In addition, there is still the possibility of switching on and off for a certain time, not to illuminate or hide defined places. The control of the laser light sources and the micromirror serving for beam deflection takes place via a computing unit, also called ECU for short (electronic or engine control unit). An example of a dynamic driving concept for forming an image by a scanning laser beam is described, for example, in Applicant's document AT 514633.
    The term "headlight" is to be understood in the context of the present invention not only a complete vehicle headlight but also a lighting unit, which may form part of a headlamp, for example, together with other lighting units.
    With regard to the required light output or the desired light pattern, a plurality of laser light sources are usually required, with the systems used for this purpose being briefly explained with reference to FIGS. 1 a to 2 b.
    1a shows a laser scanning system 1 in which laser beams are deflected by n laser light sources via a deflection element 2, wherein at least one laser diode, shown three laser diodes 3a, 3b, 3c, is necessary for the operation. In the embodiment shown by way of example, the deflecting element 2, which may be designed, for example, as a microscanner with a micromirror, deflects the laser beams of the at least one laser light source in one direction. For example, as indicated in Fig. Lb by arrows, in the horizontal direction, wherein schematically the surface is shown on a conversion element 4, over which write the laser or scans a light image, which is then projected via a projection means 5 as a luminous image on the road ,
    Analogously, FIGS. 2 a and 2 b show a laser scanning system 6 with a deflection element 7, which can deflect a light beam in two mutually orthogonal directions. Here, in contrast to the embodiment according to FIG. 1a, the laser beams of three laser diodes 8a, 8b, 8c are focused by means of an optical system 9 into a beam of desired cross section and periodically deflected by the deflection element 7 onto the conversion element 4 about two axes. Fig. 2b shows a Lissajous figure obtained, for example, as a result of such bi-directional deflection.
    Although the two systems 1 and 6 shown are representative examples that may be the starting point of the invention, this invention is not limited to
    Limited use of such systems. Because there are other systems possible, which project laser light scanning directly on the street, such as RGB systems.
    The figures show only the essential components of the systems, which may be the basis of the invention. It should be clear that a motor vehicle lighting device, in particular a headlight, requires many other elements for proper operation, for example, coolants or optical elements which influence, for example, the laser light in the intensity distribution and / or cross-sectional shape, or adjusting devices and holders which For clarity, are not shown.
    It is essential that the present invention can be applied to all systems which use more than one semiconductor light source, in particular a laser light diode, since it is precisely this plurality of light sources that makes corresponding demands on the drive.
    In order to keep the occurring power losses small to use in known solutions with parallel control or modulation of light sources often separate switching converter for each branch, the output voltage of each switching converter can be controlled individually. Although this concept is very effective in terms of minimizing the power loss, the cost of a larger number of switching transformers or regulated voltage sources is naturally also very high.
    An object of the invention is to provide a motor vehicle lighting device with a plurality of modulatable branches, each consisting of one or more semiconductor light sources, such as laser diodes or LEDs, in which a voltage monitoring and a corresponding control of a single regulated voltage source allows a reduction in power loss, even faulty states, such as open load or short circuit can be detected and taken into account.
    This object is achieved with a motor vehicle lighting device of the type mentioned, in which according to the invention an evaluation circuit is provided, which is supplied to the voltage drop at the modulation stage of each branch, wherein the evaluation circuit is adapted to the current minimum value of
    Voltage drop of a control stage supplied as an actual value, wherein the control stage is specified as the setpoint of the minimum required voltage drop and the output signal of the control stage is supplied as a control variable for the voltage control of the controllable voltage source.
    Thanks to the invention not only the power loss can be kept low in a simple manner, but it is also given the opportunity to control an idle situations safely.
    An embodiment of the invention that is easy to implement is characterized in that each modulation stage is designed as a controlled linear regulator having a transistor whose input is each driven by an operational amplifier, wherein a first input of each operational amplifier receives the signal of a current sensor located in the respective branch second input of the operational amplifier, a modulation signal is supplied.
    Advantageously, the evaluation circuit consists of a number of diodes whose number corresponds to the number of modulation stages, wherein the cathodes of the respective diodes are connected between the laser diodes and the modulation stages in the respective branch and the anodes of the diodes via a common pull-up resistor Auxiliary voltage is supplied and the anodes are connected together with a capacitor to ground.
    An inexpensive variant provides that the auxiliary voltage is formed by the output voltage of the controllable voltage source.
    With regard to the control of idling situations, it is advantageous if the regulating stage is set up to output a fault signal indicative of an open load when falling below a predetermined lower limit value of the voltage drop at a modulation stage. It makes sense that the error signal of the controllable voltage source is supplied as a shutdown signal for the output voltage.
    In a practical embodiment, the transistor is suitably a MOSFET.
    In practice, it is favorable if the electronically controllable voltage source is a DC / DC converter.
    It is also advantageous in many cases if the at least two semiconductor light sources are laser diodes.
    The invention is explained in more detail below with reference to the drawings. In these show:
    1a and 1b show a laser scanning system, as it is also known from the prior art, with three light sources and a deflectable about an axis deflecting element,
    2a and 12b, a laser scanning system, as is also known from the prior art, with three light sources and a pivotable about two axes deflecting element,
    3 shows in a block diagram an embodiment of a circuit arrangement for driving a plurality of semiconductor light sources of a motor vehicle illumination device according to the invention,
    4 shows in more detail the supply and modulation of a plurality of semiconductor light sources with omission of the evaluation circuit and the control stage,
    Fig. 5 Details of the control of the transistor of a modulation stage and
    Fig. 6 shows a possible evaluation circuit with downstream control stage.
    The block diagram of Fig. 3 shows in schematic and simplified form the essential elements of the control of a motor vehicle lighting device according to the invention. An electronically controllable voltage source 10, here a DC / DC converter, generates an output voltage Ua from a supply voltage Ue provided by the vehicle, which serves to feed a plurality of branches Zi... Zn, which each have at least one laser diode LD1, LD2, ... Have LDn. It should be understood that although only one laser diode per branch is shown in the drawing, each branch may also include multiple laser diodes, in particular in series. The current Ii .... In each
    Strand is modulated by means of modulation stages Hi, II2,... 11n, the total current supplied by the voltage source 10 is denoted by Ig.
    A modulation is necessary in order to be able to change the power of the laser diodes LDi, LD2,... LDn individually and to shape their beams into a desired luminous image on a conversion element or light image on the road, whereby legally compliant minimum values and maximum values must be complied with, and to be able to fade out, ie dimming, up to 0% of the maximum light output. Similarly, other functions may require individual modulation, such as informational displays or targeted object lighting functions. The modulation frequencies are in contrast to the switching frequency of the voltage converter 10 usually much higher and are typically in the range of 200 kHz up to several MHz.
    At each of these modulation levels Hi, II2, ....., A voltage drop Auxi, ..... Auxn occurs on the one hand for a correct function must not fall below a minimum value and on the other hand also should not be unnecessarily high, since the latter higher power losses would entail. In order to be able to detect the respective voltage drop, in the present example an evaluation circuit 12 is assigned to all the modulation stages, to which the corresponding voltage drop Auxi, ..... Auxn is supplied at each modulation stage I1, II2,...
    The evaluation circuit 12 is configured to supply the current minimum value AuXimm the voltage drop of a control stage 13 as an actual value, wherein the control stage is set as the setpoint minimum required voltage drop Ausoii and the output of the control stage 13 is supplied as a control variable for the voltage control of the controllable voltage source. The control stage 13 in turn supplies an output signal Sa as a control variable to the electronically controllable voltage source 10. In this way, an adjustment of the output voltage Ua to the voltage dropping at the modulation levels Hi, II2, ... lln voltages Auxi, ..... Auxn allows , First and foremost, that means the
    Power loss can be reduced to a minimum, since a reduction of the output voltage Ua of the voltage source 10 to the minimum voltage required for the correct function reduces the power loss at all modulation levels lli, II2, ..., without reducing their functionality.
    This minimally required voltage drop Ausou may be different, e.g. depending on manufacturer tolerances, etc., however, one will in practice define a value below which none of the modulation stages Hi, II2,... 11n may be operated. This value is fed to the control stage 13, for example as a fixed reference voltage, if a hardware solution is selected. In an integrated solution with a microcontroller and corresponding software, a corresponding value for the voltage drop Ausoii will be a stored value. The output signal Sa of the control stage 13 can cause the voltage source 10 to raise its output voltage Ua and thus to increase the voltage drop at the modulation stages, if this is too low.
    The evaluation circuit 12 described in more detail below thus provides a signal for the control stage 13, which provides one of the voltage drops at the modulation levels Hi, II2, ... lln dependent feedback variable, just the output signal Sa for the voltage source 10, and thus that of her generated output voltage Ua influenced.
    Fig. 4 shows an exemplary embodiment, wherein the voltage source 10 as a DC / DC buck converter and the modulation levels Hi, II2, ... lln are designed as controlled linear regulator. The voltage source 10, thus the DC / DC converter, has as essential components in a known manner a controlled switch TI, a diode Dl, a longitudinal inductance L and a storage capacitor CI; the modulation stages Hi, II2, ... lln each consist of an operational amplifier 14i, 142 ... 14n, each of which forms a current control loop with a MOSFET T3i, T32, ... T3n, for example an n-channel MOSFET, which depends from the voltage drop at each of a current sensor RSi, Rs2, ... Rsn, which is designed as a resistor in the present case and a modulation signal Ssi .... Ssn or a reference signal, which at the second input of the operational amplifier 14i, 142 .. .14n is applied, controlled and thus influences the current flow in the respective branch Zi .., Zn. The modulation signal Ssi... Ssn applied to the second input can originate, for example, from a control system, the vehicle-side signals, such as, for example, camera signals and also headlight-side signals, such as, for example
    Micromirror synchronization signals, processed. Also possible is a control via the control stage 13, this should be designed as a microcontroller.
    In Fig. 5 shows in detail an advantageous circuit of such a controlled linear controller for the first branch Zi, in addition resistors Rli, R2i in combination with a
    Capacitor Cli serve to compensate or stabilize the high-frequency modulating current control loop.
    FIG. 6 shows a detailed embodiment of the evaluation circuit 12. As can be seen in FIG. 4, this intervenes between the modulation stages Hi, II2,... 11n and the laser diodes LD1, LD2,... LDD, the voltage which is thus the voltage dropping at the modulation stages Hi, II2, Auxl, Aux2, ... Auxn equals. The subsequent control stage 13 is connected to an input of this evaluation circuit 12 and at the second input of the minimally required voltage drop Ausoii specified. The evaluation circuit 12 consists of a number of diodes D2i, D22, ... D2n, wherein the number of the number of modulation stages corresponds to lli, II2, ... lln, and a pull-up resistor R3, wherein the cathode of each diode between the Laser diode and the associated modulation stage in the respective branch Ζι.,. Ζη is connected. The diodes D2i, D22, ... D2n are advantageously designed as Schottky diodes. The pull-up resistor is connected to an auxiliary voltage Vcc which is advantageously formed by the output voltage Ua of the controllable voltage source 10. Furthermore, the evaluation circuit 12 is assigned a capacitor C2 at the output. The evaluation circuit feeds the control stage 13 the voltage drop of that modulation stage, in whose strand the laser diode has the highest voltage drop, since thus the voltage applied to the modulation stage has the lowest value in comparison to the other modulation stages. The control stage 13 therefore outputs a signal Sa, which serves as a manipulated variable for the voltage regulation of the controllable voltage source 10. Advantageously, the control stage 13 is designed as an integrating control element or as a control element with an integrating component. Furthermore, the control stage 13 can also be embodied in the form of a microcontroller and thus act as a software controller as a controller in order to deliver a signal for the controllable voltage source 10.
    The control stage 13 causes, for example, with a decrease in the voltage Auxl, Aux2, ... Auxnan a modulation Hi, II2, ... lln below a predetermined setpoint Ausoii the controllable voltage source 10 to increase the output voltage Ua. Known conventional regulation of the output voltage of such a controllable voltage source, in which for example a proportional to the output voltage Ua size, which is formed via a voltage divider, is used, can be easily combined with the invention.
    As a result of an open load in one of the branches Zi ... Zn, the modulation stage 11 would have a voltage drop Au * i, ..... Au in the affected branch which approaches zero, whereby this voltage drop via the evaluation circuit 12 of FIG Control stage 13 is supplied, which then emits a signal which corresponds to a, indicative of an open load, error signal. For example, the error signal could be defined by an increased voltage value at the output of the control stage 13.
    The elements shown together represent only exemplary embodiments, which in the present case are at least cost-effective and at the same time efficient solutions and thus have particular advantages in connection with the described invention.
    The choice of additional switching elements is also in the hands of the person skilled in the art, whereby, for example, further filter elements and protective elements are possible, but not shown for the sake of clarity.
    List of reference numbers 1 Laser scanning system CI Storage capacitor 2 Deflection element C3, C4 Capacitor 3a Laser diode D2i ... D2n Diodes 3b Laser diode D3 Zener diode 3c Laser diode Auxi, ..... Auxn Voltage drop 4 Conversion element AuSOii Setpoint 5 Projection mean AuXimin Minimum value 6 Laser scanning system lG Total current 7 Deflection element li ... ln Power 8a Laser diode L Longitudinal inductance 8b Laser diode LDi, LD2, ... LDn Laser diode 8c Laser diode R3 Pull-up resistor 9 Optics system Rsi, Rs2, ··· Rsn Current sensor 10 Voltage source sA Output signal
    Hi, H2, ... 11 (1 modulation stage ss control signal 12i, 122, ... 12 (1 evaluation circuit TI switch
    13 Control stage T3i, T32, ... T3n MOSFET 14i, 142 ... 14n Operational amplifier Ua Output voltage UE Supply voltage
    Zi ... Zn branches
    权利要求:
    Claims (9)
    [1]
    claims
    1. Motor vehicle lighting device having at least two semiconductor light sources for generating a light distribution, wherein one of the illumination device associated circuitry for driving at least two modulation branches (Zi .. .Zn) for semiconductor light sources (LD1 .. .. LDn) is provided, each branch has at least one semiconductor light source which is in series with a modulation stage (Hi, II2, .. .ln) which modulates the current in the respective branch, and the branches in parallel at the output voltage (Ua) of a common electronically controllable voltage source (10) lie, characterized in that an evaluation circuit (12) is provided, which the voltage drop (Auxi, ..... Auxn) at the modulation stage (Hi, II2, ... lln) each branch (Ζι., Ζη zugeführtη) supplied is, wherein the evaluation circuit is adapted to supply the current minimum value (Auxmm) of the voltage drop (Auxi, ..... Auxn) of a control stage (13) as an actual value, wherein the control stage is specified as the set value of the minimum required voltage drop (Ausoii) and the output signal (sa) of the control stage as a control variable for the voltage control of the controllable voltage source (10) is supplied.
    [2]
    2. Motor vehicle lighting device according to claim 1, characterized in that each modulation stage (Hi, II2, ... .lln) as a controlled linear regulator with a transistor (T3i, T32, .. .T3n) are formed, the input of each of an operational amplifier (14i .., 14n) is controlled, wherein a first input of each operational amplifier, the signal of a current sensor lying in the respective branch (Rsi .. .. Rsn) and a second input of the operational amplifier, a modulation signal (Ssi .. ..Ssn) is led to.
    [3]
    3. Motor vehicle lighting device according to claim 1 or 2, characterized in that the evaluation circuit (12) consists of a number of diodes (D2i ... D2n) whose number of the number of modulation stages (Hi, II2, ... lln) corresponds, wherein the cathodes of the respective diodes (D2i ... D2n) between the laser diodes (LD1 .. .. LDn) and the modulation stages (Hi, II2, .. .. nn) in the respective branch (Zi .. .Zn) connected are and the anodes of the diodes (D2i ... D2n) via a common pull-up resistor (R3) is supplied to an auxiliary voltage (Vcc) and the anodes are connected together with a capacitor (C2) to ground.
    [4]
    4. Motor vehicle lighting device according to claim 3, characterized in that the auxiliary voltage (Vcc) is formed by the output voltage (Ua) of the controllable voltage source.
    [5]
    5. Motor vehicle lighting device according to claim 1,2 or 3, characterized in that the control stage (13) is adapted to fall below a predetermined lower limit of the voltage drop (Auxi, ..... Auxn) at a modulation stage (Hi, II2, ... .n), to issue an error signal indicative of an open load.
    [6]
    6. Motor vehicle lighting device according to claim 5, characterized in that the error signal of the controllable voltage source (10) is supplied as a switch-off signal for the output voltage (Ua).
    [7]
    A motor vehicle lighting device according to any one of claims 2 to 6, characterized in that the transistor (T3i, T32, ... T3n) is a MOSFET.
    [8]
    8. Motor vehicle lighting device according to one of claims 1 to 7, characterized in that the electronically controllable voltage source (10) is a DC / DC converter.
    [9]
    9. Motor vehicle lighting device according to one of claims 1 to 8, characterized in that the at least two semiconductor light sources (LD1 .. .. LDn) are laser diodes.
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    引用文献:
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    法律状态:
    2022-02-15| MM01| Lapse because of not paying annual fees|Effective date: 20210607 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50523/2016A|AT518685B1|2016-06-07|2016-06-07|Motor vehicle lighting device|ATA50523/2016A| AT518685B1|2016-06-07|2016-06-07|Motor vehicle lighting device|
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    CN201710422146.9A| CN107757464A|2016-06-07|2017-06-07|Lighting assembly for vehicles|
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