• 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 lighting device for vehicles, which has at least one LED branch (Z1, Z2) with at least one LED (DL11 ... DL1n, DL21 ... DL2n), as well as with a regulated LED power supply (1) and a control (3), which dimming signals (sDA1, sDA2; sDD1, sDD2) supplies for the LEDs, wherein the at least one LED branch (Z1, Z2) is associated with an electronic switch (TS1, TS2) to which a PWM dimming signal (sDD1, sDD2) is supplied, and the at least one LED branch for branching a partial current (IN1, IN2) is bridged by a regulated secondary circuit (N1, N2) which has a current regulator with an analog regulator (21, TN1, 22, TN2) to which an analogue dimming signal ( sDA1, sDA2) is supplied.
    公开号:AT517324A1
    申请号:T50445/2015
    申请日:2015-06-01
    公开日:2016-12-15
    发明作者:Weber Emanuel；Fritz Gerald
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    Lighting device for vehicles
    The invention relates to a lighting device for vehicles, which has at least one LED branch with at least one LED, as well as with a regulated LED power supply and a drive which supplies dimming signals for the LEDs.
    By using LEDs as a light source for vehicle headlights and other lighting devices on vehicles, such as e.g. Flashing lights, the designers have been given new possibilities in the design of the individual lighting functions. In addition to the actual function, more and more attention is paid to the design. An essential detail is the optical transition between the switching of two or more light functions. Instead, the switch-on and switch-off processes are continuously implemented via a ramp, whereby a problem that occurs is the start of a switch-on phase or the end of a switch-off phase, since at these times The LEDs and thus the radiated light are dimmed to zero in very small steps, usually by a PWM dimming of the light function from 100% to 0% or from 0% to 100%, especially with PWM values smaller than 10%. If, however, a visible flickering of the light function often occurs here, special precautions must be taken to prevent such an unsustainable flickering in practical operation One possible measure is to make an analog reduction of the current value by the power supply as such do not set the PWM value (duty cycle) below a certain limit, eg 10%, and thus no visible flame occurs grow up. In this case, it is imperative that the power supply performs the analog control of each individual LED current, which means, however, that each LED or each LED branch requires its own power supply, which can be costly.
    An object of the invention is to provide a lighting device in which a flicker-free dimming of individual lighting functions is made possible flexibly and without great effort.
    This object is achieved with a lighting device of the type specified, in which according to the invention the at least one LED branch is associated with an electronic switch, which is supplied with a PWM dimming signal, and the at least one LED branch for branching a partial flow of a regulated secondary circuit is bridged having a current regulator with an analog controller to which an analog dimming signal is supplied.
    Thanks to the invention, a single regulated power supply can be used and also several in series and / or parallel LED branches or strands can be operated with individually adjustable power. In particular, the invention allows a continuous dimming from 0% to 100% without visible flickering of the light image.
    A particularly lossless control can result if the electronic switch is arranged in series with the at least one LED branch
    In another economic training can be provided that at least two LED branches are connected in series.
    On the other hand, it may also be expedient in certain cases if at least two LED branches are connected in parallel. In this case, it is recommended that the regulated LED power supply is designed as a constant voltage source.
    In advantageous and easy to build variants, it may be useful if the analog controller has an operational amplifier and a transistor controlled by this.
    Furthermore, it is recommended that the analog controller is supplied as a controlled variable to the current through the at least one secondary circuit proportional signal.
    In other expedient embodiments, it may be appropriate if in the secondary circuit a traversed by the diverted current resistor is arranged.
    It may be quite appropriate in certain cases, when the electronic switch is connected in parallel to the at least one LED branch.
    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
    1 shows a simplified circuit arrangement for a lighting device according to the invention in a first embodiment,
    Fig. 2 shows a second example, circuit arrangement for a lighting device according to the invention and
    Fig. 3 third example, circuit arrangement for a lighting device according to the invention.
    In Fig. 1 shows a regulated power supply 1, which is formed in the present case as a boost converter, in which symbolically an inductance L, a switching transistor Ts, a diode D and a capacitor C are located. This boost converter or the power supply 1 is operated on an input voltage Ue, for example, that of a car battery, and in the present case provides a constant output current Ig, wherein at the output of the power supply voltage Ua is applied. With this output current Ig, an LED branch Z is fed, which has one or more LEDs Du ... Dlh and in whose branch further an electronic switch Ts, generally a switching transistor is connected.
    Parallel to the LED branch Z is located for branching a partial flow In a regulated side circuit N, which here consists of a transistor Tn and a resistor R in series with this transistor, the transistor Tn is driven by an operational amplifier 2. The operational amplifier 2 receives as a control signal occurring at the resistor R voltage drop, which is proportional to the current In at an input and at its other input an analogue dimming signal sda, which is supplied by a driver 3. This drive also provides a digital dimming signal sdd at the electronic switch, i. The driver 3 may optionally also provide a control signal si for the control of the power supply 1.
    It can be seen that there are thus two possibilities for dimming the LEDS Dli ... Di n, namely, on the one hand via the electronic switch Ts, that of a digital one
    Dimming signal Sdd, generally a PWM signal is driven, and on the other hand via the current regulator in the bypass circuit, namely the transistor Tn, which is controlled and regulated via the operational amplifier 2, and which can branch off a partial current In of the total current Ig.
    The driver 3, which can also be supplied with an external dimming signal st, now works so that it is only responsible for dimming at higher dimming values and corresponding to a large duty cycle of the PWM, e.g. between 100% and 10% duty cycle. In this operating state, the transistor Tn is not conducting and no bypass current In flows, so that the current ID corresponds to the total Ig.
    However, if it is to be dimmed below this value, a control via a PWM would generally lead to an unpleasant flickering of the light impression for the eye. According to the invention, the bypass circuit now takes over the control or dimming task in which it branches off a partial flow or secondary flow In, so that in this way a certain value, e.g. 10% of the desired dimming value until 0% analogue dimming takes place. That above a certain value, the duty cycle of the PWM is not further reduced, and the branched current In is converted into heat in the transistor Tn. Since this conversion of electrical energy into heat takes place only at an already greatly reduced dimming level, it is not significantly significant.
    Fig. 2 shows a circuit similar to that of Fig. 1, wherein like reference numerals are used for the same components, but this circuit is extended to two dimmable, series-connected LED branches ZI and Z2. Again, these branches are supplied by a power supply 1 with a total current Ig, which flows through the first branch ZI with the LEDs Dm ... Dl: i n and the second branch Z2 lying in series with the LEDs Dl2i ... DL2n.
    Parallel to the first branch ZI is a branch circuit NI, formed by a transistor Tni, which is connected in series with a sensor resistor Ri. The transistor TI is driven by an operational amplifier 2i, which receives a digital dimming signal sdai at its first input. The second input of the operational amplifier 2i, the output signal of a differential amplifier 4 is supplied, the two inputs are connected to the resistor Ri, so that the operational amplifier corresponding to the branched stream Ini
    Voltage is supplied. The LED branch ZI, consisting of the series LEDs Dm ... Du * is bridged by an electronic switch Tsi, generally a switching transistor, which receives a digital dimming signal Sddi. It should be noted that each LED branch in the simplest case may also contain only a single LED. For the second LED branch Z2, consisting of LEDs Dl2i .. .DL2n connected in series, the same applies in principle with respect to its dimming circuit as for the first branch ZI. The subcircuit N2 in turn contains a transistor Tn2, which is connected in series with a sensor resistor R2, but here no differential amplifier is required, as for the subcircuit Ni, since the sensor resistor R2 is connected to ground with a terminal, so that the secondary current In2 corresponding signal can be passed directly from R2 to the second input of an operational amplifier 22, which drives the transistor Tn2. At the first input of the operational amplifier 22, an analog dimming signal sda2 is supplied by the driver 3. Again, the control can deliver external dimming signals sDi and sD2 for the two LED branches ZI and Z2 and also a control signal si to the power supply 1.
    The difference between the embodiment of FIG. 2 and that of FIG. 1 is that the transistors Tsi and Ts2, which are driven by a PWM signal, are not connected in series with an LED branch, but are connected in parallel with each LED. Branch ZI, Z2. Since the two branches are supplied with constant current, depending on the duty cycle, part of the current flows through the parallel-connected transistor Tsi or Ts2, which is however generally chosen so that it has a very low resistance, so that in this way There are no significant additional losses. Again, PWM signals are preferably dimmed in a range of 100% to about 10%, at least up to a range that causes no flicker of the LEDs in the sense of an unpleasant impression on a viewer. Of course, said lower value of the duty ratio may be other than 10%, for example, 15% or 20%. From this limit value to be determined, dimming is analog in both branches, the function corresponding exactly to that which has already been described in connection with FIG. The advantage of this embodiment of Fig. 2 is also that with a single power supply, which provides a constant current Ig here, the Auslangen can be found, even if two or more LED branches are to be dimmed independently.
    Fig. 3 shows a further embodiment of the invention, which corresponds to the presence of two LED branches ZI and Z2 with analog sub-branches NI and N2 that of FIG. 2, again with the same or comparable components, the same reference numerals have been used.
    It can be seen, however, that in the embodiment according to FIG. 3, the two LED branches Z1 and Z2 are connected in parallel with the LEDs Dm ... Dm n and Dl2i ... Dl22 to a constant voltage source 5 with an output voltage Ua. In each branch ZI or Z2, an electronic switch Tzi or Tz2 is arranged in series with the LEDs and also a sensor resistor Rzi or Rz2. Each of the electronic switches Tzi, Tz2 is driven by a digital dimming signal Sddi or Sdd2, these signals preferably being PWM signals and originating from the drive 3, to which extra dimming signals Sdi and Sm can also be supplied. Likewise, the drive 3 can supply a control signal si to the constant-voltage source 5, which serves as a regulated LED power supply here.
    Similar to the embodiment according to FIG. 2, each LED branch ZI or Z2 is also bridged by a regulated branch circuit NI or N2, these branch circuits each having one transistor Tni, Tn2, which is controlled by an operational amplifier 2i, 22. Each operational amplifier 2i and 22 receives an analogue dimming signal sdai or sda2 from the control 3 and a control signal from a differential amplifier 61 or 62, whose input is supplied with the voltage drop across the sensor resistor Rzi or Rz2. These voltage drops correspond to the currents Idi and Id2 through the LEDs of the two LED branches ZI and Z2.
    It should be clear that, on the one hand, more than two LED branches Z1, Z2 can lie parallel to one another in the manner shown and, on the other hand, one, two or more LEDs can be present in each LED branch, provided the output voltage Ua corresponds to the constant voltage source 5 is measured.
    Also in this embodiment, when dimming is performed above a certain level of dimming, e.g. 10% and is at the "flicker limit", has moved from a digital, PWM dimming via the series transistors Tzi and Tz2 to an analogue dimming via the secondary branches NI and N 2. The embodiment shown according to FIG. if not too high power is required for the LED supply, it must also be ensured that in the PWM mode the analog secondary branch must react very quickly in order to avoid current peaks through the LEDs, whereby the analog controller can switch to PWM control be included via the control 3 and held during the PWMOff phase in a sample-and-hold state.
    权利要求:
    Claims (9)
    [1]
    1. Lighting device for vehicles, which has at least one LED branch (Z; ZI, Z2) with at least one LED (DLi ... DLn; Dni ... Dnn, Dl2i ... Dl2ii), as well as with a regulated LED Power supply (1, 5) and a driver (3) which supplies dimming signals (sda, sdd; sdai, sda2; sddi, sdd2) for the LEDs, characterized in that the at least one LED branch (Z; ZI, Z2) an electronic switch (Ts; Tsi, Ts; Tsi, Ts2) is assigned to which a PWM dimming signal (sdd; sddi, sdd2) is supplied, and the at least one LED branch for branching a partial flow (In, Ini, In2) is bridged by a regulated branch circuit (N; NI, N2) having a current regulator with an analog regulator (2, TN; 2i, T Ni, 22, Tn2) to which an analogue dimming signal (sda, sdai, sda2) is supplied ,
    [2]
    2. Lighting device according to claim 1, characterized in that the electronic switch (Ts; Tzi, Tz2) is arranged in series with the at least one LED branch (Z; ZI, Z2)
    [3]
    3. Lighting device according to claim 1 or 2, characterized in that at least two LED branches (Z; ZI, Z2) are connected in series.
    [4]
    4. Lighting device according to one of claims 1 to 3, characterized in that at least two LED branches (Z; ZI, Z2) are connected in parallel.
    [5]
    5. Lighting device according to claim 4, characterized in that the regulated LED power supply (5) is designed as a constant voltage source.
    [6]
    6. Lighting device according to one of claims 1 to 5, characterized in that the analog controller comprises an operational amplifier (2; 2i, 22) and a transistor (Tn; Tni, Tn2) controlled by this.
    [7]
    7. Lighting device according to one of claims 1 to 6, characterized in that the analog controller as a control variable to the current (In) by the at least one secondary circuit (N; NI, N2) is supplied proportional signal.
    [8]
    8. Lighting device according to one of claims 1 to 7, characterized in that in the secondary circuit (N; NI, N2) from the branched current (In) traversed resistor (R; RI, R2) is arranged.
    [9]
    9. Lighting device according to one of claims 1 to 8, characterized in that the electronic switch (Tsi, Ts2) is connected in parallel to the at least one LED branch (Z; ZI, Z2).
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