• 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:
    Motor vehicle illumination device with at least one branch (1) of semiconductor light sources, which comprises two or more light source units (LED1... LED4) connected in series, with individual light source units having a MOSFET switch (2-1 .. 2-4) is assigned to which at least one branch of the output voltage (UA) of a DC / DC converter (3) is fed to ground, each MOSFET switch to its drive a drive circuit (4- 1 ... 4-4) is assigned, wherein each MOSFET switch (2-1..2-4) is a p-channel MOSFET, the DC / DC converter (3) is associated with a rectifier circuit (5) whose input to one pole of a storage inductance (L2) of the converter on which negative voltage pulses occur against ground, and the rectifier circuit (5) is designed to rectify the negative pulses and to generate the resulting negative direct voltage (US) of the drive circuit (4-1 ... 4 4) for switching the respective MOSFET switch to provide.
    公开号:AT518423A4
    申请号:T50417/2016
    申请日:2016-05-06
    公开日:2017-10-15
    发明作者:Guth Christian
    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 having at least one branch of semiconductor light sources comprising two or more light source units connected in series, wherein individual light source units are assigned a bridging MOSFET switch, which is at least one branch of the output voltage of a DC / DC converter is fed to ground, each MOSFET switch is assigned to its control a drive circuit.
    In motor vehicle lighting devices of this type, for example headlamps, a number of light source units are provided, which are individually switched on or off to realize complex lighting functions, such as matrix or Kurvenlicht- functions or periodically clocked in the sense of dimming. As light sources are usually LEDs or laser diodes, the latter often used with light conversion means. The term "light source units" as used herein is intended to include the series connection of combinations of individual series-connected and / or parallel-connected individual light sources, for example LEDs, such a combination forming a light source unit.
    Basically all common circuit concepts are based on the fact that the light source units to be activated / deactivated, e.g. an LED is bridged by a semiconductor switch so that the current flows through the switch instead of the LED. As a semiconductor switch are usually MOS-FETs, bipolar transistors o-also fully integrated IC solutions.
    In representational motor vehicle lighting devices there is the additional problem that usually, with changing LED number and the accompanying varying LED strand voltage, only DC / DC converters can be used, which can control voltages greater than and less than the input voltage, for example Cuk converter or SEPIC converter.
    A problem encountered is to provide the voltage levels required for the switches and to adapt them to the dynamically changing switching thresholds of the individual switches in order to fully utilize the functionality of all possible LED combinations. Common solutions sometimes cause high power losses in the implementation or they are limited in functionality or too complicated for specific applications in terms of cost and the number of components. For example, the driving of often used n-channel MOSFETs is associated with relatively high power dissipation and often requires a charge pump. In principle, possible solutions with transformers or optocouplers are expensive and difficult to implement in the automotive sector, which also applies to fully integrated solutions.
    An object of the invention is to obtain a fully functional but cost-effective solution of the above problems for a motor vehicle lighting device of the type in question here.
    This object is achieved with a motor vehicle lighting device of the type mentioned, in which according to the invention each MOSFET switch is a p-channel MOSFET, the DC / DC converter is associated with a rectifier circuit whose input to one pole of a storage inductance of Transducer is connected, on which occur against ground negative voltage pulses, and the rectifier circuit is adapted to rectify the negative pulses and provide the resulting negative DC voltage of the drive circuit for switching the respective MOSFETs available.
    The invention leads to a cost-effective solution that also allows the simultaneous bridging of multiple LEDs, which is not possible for example in integrated concepts. Furthermore, even those MOSFETs can be easily controlled, whose source is at ground potential.
    In expedient variants, it is provided that the DC / DC converter is a Cuk converter or a SEPIC converter.
    An inexpensive solution provides that the rectifier circuit includes a rectifier diode for generating the DC voltage.
    Furthermore, it is advantageous if the rectifier circuit additionally has filter means for the DC voltage.
    It is also highly recommended if the rectifier circuit has stabilizing means for the DC voltage.
    In a practical embodiment, it is provided that each drive circuit has a collector-connected npn transistor whose collector is connected to the gate of the associated MOSFET switch.
    In this case, it is also recommended that the npn transistor is preceded by a pnp pre-stage transistor.
    Appropriately, as a starting point for the entire control is when a microcontroller is provided, whose outputs are guided to drive circuits for the MOSFET switches.
    The invention together with further advantages is explained in more detail below by way of example embodiments, which are illustrated in the drawing. In this show
    Fig. 1 in a simplified block diagram of the basic structure of the invention and
    Fig. 2 shows in more detail further details of an embodiment of the invention.
    The block diagram of Fig. 1 shows in a schematic and simplified form the essential elements of the control of a motor vehicle lighting device according to the invention. Shown is a branch 1 with in this example four series-connected semiconductor light source units LED1 .. .LED 4, wherein each light source unit is assigned a bridging these MOSFET switches 2-1 .... 2-4. The branch 1 is fed by the output voltage Ua of a DC / DC converter 3 to ground, wherein each MOSFET switch 2-1 .. .. 2-4 to drive a drive circuit 4-1 .... 4-4 assigned. The input voltage Ue of the DC / DC converter 3 will generally be taken from the electrical system of a motor vehicle. The drive circuits 4-1... 4-4 receive a supply voltage Vcc of, for example, + 5V. As shown and described in greater detail below, the drive circuits 4-1 .4-4 are supplied with switching signals sl... S4.
    As semiconductor light source units, it has already been mentioned at the beginning, preferably LEDs or laser diodes, these often used together with light conversion means. The term "light source unit" as used herein is intended to include that, in principle, each of the light source units LED1 ... LED 4 can also comprise a combination of individual individual light sources, eg LEDs, connected in series and / or parallel, although in the branch 1 there are four light source units LED1. 4 LED, this number may be different and the lighting device may also comprise a plurality of such branches.
    Each MOSFET switch 2-1 .... 2-4 is according to the invention, a p-channel MOSFET and the DC / DC converter 3, a rectifier circuit 5 is arranged to whose input with one pole of a storage inductance L2 of the even closer connected to the transducer to be described on which occur against ground negative voltage pulses. The rectifier circuit 5 is configured to rectify the negative pulses and to provide the resulting negative DC voltage Us to the drive circuit as a switching voltage for switching the respective MOSFET 2-1 .... 2-4. Each MOSFET switch 2-1 .... 2-4 is to bridge the current via the respective light source units LED1 ... LED 4 and thus switch them off or can dim their pulse width modulated in their brightness.
    The DC / DC converter 3 can advantageously set the output voltage Ua both higher and lower than the input voltage Ue, wherein the output voltage Ua is controlled so that the light source units LED1 ... LED 4 operated at the necessary operating point of the desired supply current Ig become. For example, SEPIC converters or Cuk converters are known to those skilled in the art in which, due to the topology, a negative
    Voltage arises at a storage throttle, which is essential for the realization of the invention. A Cuk converter can also be constructed with a transformer isolating.
    Fig. 2 shows a detailed embodiment of the control according to the invention. The DC / DC converter 3 is designed here as a SEPIC converter, which has in a known manner three energy stores - two inductors LI, L2 and a capacitor CI. The inductors can be arranged on a common bobbin. The charged to the input voltage Ue on capacitor CI charges its energy in the phase in which the semiconductor switch TI is turned off, to the inductance L2. Between the diode Dl, which operates in this phase in the reverse direction, and the capacitor CI and the inductance L2, a negative voltage is thereby generated which is fed to the rectifier circuit 5.
    The rectifier circuit 5 has on the input side a diode-capacitor network D2, C3 to tap and rectify the negative voltage. The diode D2 prevents a subsequent capacitor C3 can charge in the forward operation of the diode Dl to a positive voltage and therefore acts as a rectifier diode. On the output side, a Zener diode D3 is used for voltage stabilization, wherein the voltage is derived which is above the breakdown voltage of this Zener diode D3. The resistors RI and R2 serve to limit the current. A capacitor C4 at the output of the rectifier circuit 5 increases the stabilization effect and reduces residual ripples. The output voltage Us dependent thereon from the breakdown voltage of the zener diode D3 can be provided as a switching voltage for switching the MOSFET switches 2-1... 2-4 for the drive circuits 4-1...
    Each of these drive circuits 4-1 .. .4-4, as shown here for the drive circuit 4-1, consists for example of a npn transistor T3 in collector circuit with an upstream transistor T2, which is controlled as a pre-stage transistor by a microcontroller 6 to switch the base of the transistor T3 between a positive and the negative voltage Us provided by the rectifier circuit 5. The collector of the transistor T3 is the output of the drive circuit 4-1 and thus lies at the gate of the associated MOSFET switch 2-1.
    In the present case, let the positive voltage be the resulting voltage from the supply voltage Vcc, e.g. + 5V, minus the voltage drops at R3 and T2 and the negative voltage Us is -5V. If the microcontroller 6 switches to logic "high" (5V), the transistor T2 switches off and the base voltage of the transistor T3 is connected to the resistor R5 at -5 V. The MOSFET switch 2-1 is not activated since there is no current flow and thus On the other hand, if the microcontroller switches the base voltage of the transistor T2 to logic "low" (OV), a constant current flows in the branch with the resistor R6 and accordingly a constant voltage drops across the resistor R4, which at the collector of the transistor T3 and thus at the gate input of the p-channel MOSFET switch 2-1 has a lower potential than at its source Elelekt-rode. In this case, the MOSFET switch 2-1 closes and bridges the light source unit LED1.
    In the present case, the stabilization of the voltage Us in the rectifier circuit 5 takes place by means of the zener diode D3, but it should be clear that this is not to be regarded as limiting the invention. Rather, voltage stabilization can also be achieved, for example, by means of a linear regulator, e.g. using an operational amplifier.
    As already indicated, an arrangement of the semiconductor light source units LED1-LED4 is not necessarily required in a single branch. The semiconductor light source units could for example also be divided into two branches. Also, an output of the microcontroller 6 may drive two or more of the drive circuits 4-1 ... 4 - 4 simultaneously. The number of semiconductor light source units is of course arbitrary and not limited to four, as shown in the example.
    Essential for the invention is the tapping of a negative voltage to the DC / DC converter 3 in order to gain a stable negative voltage, which is for driving the MOSFET switches 2-1 .... 2-4 usable. The illustrated elements for providing and stabilizing the negative voltage represent only an exemplary embodiment, which in the present example in any case is a cost effective and at the same time efficient solution and thus has 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.
    权利要求:
    Claims (9)
    [1]
    claims
    An automotive lighting device comprising at least one branch (1) of semiconductor light sources comprising two or more series-connected light source units (LED1 .... LED4), with individual light source units having a MOSFET switch bridging them (2-1 .. 2-4) is assigned, which is fed to ground at least one branch of the output voltage (Ua) of a DC / DC converter (3), wherein each MOSFET switch for driving a drive circuit (4-1 ... 4- 4), characterized in that each MOSFET switch (2-1..2-4) is a p-channel MOSFET, the DC / DC converter (3) is arranged to a rectifier circuit (5) whose Input is connected to one pole of a storage inductor (L2) of the converter, on which occur against ground negative voltage pulses, and the rectifier circuit (5) is adapted to rectify the negative pulses and the resulting negative DC voltage (Us) of the drive circuit (4-). 1 .. .4-4) to the Scha Lten the respective MOSFET switch to provide.
    [2]
    2. Motor vehicle lighting device according to claim 1, characterized in that the DC / DC converter (3) is a Cuk converter.
    [3]
    3. Motor vehicle lighting device according to claim 1, characterized in that the DC / DC converter (3) is a SEPIC converter
    [4]
    4. Motor vehicle lighting device according to one of claims 1 to 3, characterized in that the rectifier circuit (5) contains a rectifier diode (D2) for generating the DC voltage (Us).
    [5]
    5. Motor vehicle lighting device according to one of claims 1 to 4, characterized in that the rectifier circuit (5) additionally comprises screening means (C3, C4) for the DC voltage (Us).
    [6]
    6. Motor vehicle lighting device according to one claims 1 to 5, characterized in that the rectifier circuit (5) stabilizing means (D3) for the DC voltage (Us).
    [7]
    7. Motor vehicle lighting device according to one of claims 1 to 6, characterized in that each drive circuit (4-1 .. .4-4) has a collector circuit operated npn transistor (T3) whose collector is connected to the gate of the associated MOSFET Switch (2-1) is connected.
    [8]
    8. Motor vehicle lighting device according to claim 7, characterized in that the NPN transistor (T3) is preceded by a PNP pre-stage transistor (T2).
    [9]
    9. Motor vehicle lighting device according to one of claims 1 to 8, characterized in that a microcontroller (6) is provided, whose outputs to drive circuits (4-1 ... 4-4) for the MOSFET switch (2-1 .. 2-4) are performed.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50417/2016A|AT518423B1|2016-05-06|2016-05-06|Motor vehicle lighting device|ATA50417/2016A| AT518423B1|2016-05-06|2016-05-06|Motor vehicle lighting device|
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    PCT/AT2017/060119| WO2017190172A1|2016-05-06|2017-05-05|Motor vehicle illumination device|
    CN201780028053.6A| CN109076669B|2016-05-06|2017-05-05|Lighting device for motor vehicle|
    EP17723243.6A| EP3453231B1|2016-05-06|2017-05-05|Motor vehicle illumination device|
    JP2018558240A| JP6724166B2|2016-05-06|2017-05-05|Lighting equipment for motor vehicles|
    KR1020187035290A| KR102146518B1|2016-05-06|2017-05-05|Car lighting device|
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