• 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:
    LED light module (M) for a lighting device for vehicles comprising at least one LED branch with at least one LED (LED1 .... LEDn), wherein at least one module (RR) is arranged on the module for identifying a Bin class, and Module is set up for operation with a total current (IG), parallel to the partial current (ID) of the total current (IG) leading LED branch (Z) an analog controller (3, T2) is connected for branching a partial flow (IB), wherein a signal (US), which corresponds to the total current (IG), is fed to the analog regulator as a reference variable, and a signal (UR), which is proportional to one of the sub-currents (IB, ID), and from the component (RR), is fed as control variable. to identify the bin class.
    公开号:AT516860A4
    申请号:T50443/2015
    申请日:2015-06-01
    公开日:2016-09-15
    发明作者:Emanuel Weber；Roland Wachter
    申请人:Zizala Lichtsysteme Gmbh；
    IPC主号:
    专利说明:

    LED light module for a lighting device for vehicles
    The invention relates to an LED light module for a lighting device for vehicles comprising at least one LED branch with at least one LED, wherein on the module at least one component for identifying a Bin class is arranged, and the module for operation with a Total electricity is set up.
    According to the current state of the art, a separate LED board together with an upstream driver has to be developed for almost every light function of a vehicle's lights. Especially with regard to a desired interchangeability of a light source, this state is not desirable. Therefore, and because of the increase of LEDs as bulbs in the automotive sector, u. A. the desire for standardized LEDs came up. Such light sources should be specified so that each light source is replaceable and light sources from different manufacturers can be used. Under other specification criteria, the power consumption for a certain intensity and light color must be standardized. The upstream of the light source controller or the upstream driver electronics then controls this standard current, regardless of which light source is connected to its output.
    A particular challenge lies in being able to use different LEDs and in particular LEDs with different brightness bins. ("Binning" is a classification of an LED production eg in terms of brightness, luminous flux, hue etc. in "bins") If LEDs with different brightness bin are operated with the same current, they light up with different brightness levels, which understandably would lead to different brightness when replacing the LEDs, so that a simple replacement is out of the question. A standardized light source must therefore have a suitable wiring, which counteracts this fact, namely different magnitudes in an exchange.
    In addition, such standardized light sources must allow the usual control of the LEDs. For example, the light sources should be dimmable via PWM and analog via the current. If the upstream controller specifies a certain value, for. For example, if analog dimming is 60%, the actual current through the LED must also be dimmed to that value.
    To solve the problem of the mentioned differences in the brightness can be parallel to the series connection of two or more LEDs provide a parallel resistor whose value is selected depending on the brightness class. One possibility for the corresponding coding of LEDs according to light intensity classes and a corresponding parallel connection of resistors is disclosed, for example, in DE 198 14495 A1. Although this solution is simple, it has the disadvantage that it is associated with large tolerances, because depending on the forward voltage of the LEDs, which depends on the binning as well as on the temperature, different LED currents result, so that the brightness in Each operating state is different and varies greatly between LEDs with different binning. In addition, electrical energy is unnecessarily converted into heat in the shunt resistor, which is very disadvantageous especially with a larger number of LED light sources, especially in motor vehicles.
    Instead of the above-mentioned parallel resistor, it is also possible to use a bypass branch with a linear regulator. In connection with a dimmable light source, a comparable circuit from EP 2797386 Al has become known. The problem shown there is that LEDs dimming - unlike incandescent - barely change their color. However, in order to achieve the same effect as with incandescent lamps when dimming LEDs, white LEDs are operated together with yellow LEDs, and a bypass is used to regulate the current of one LED type by branching off a partial current. Due to the task set with regard to influencing the luminous color mixture of two LED types when dimming or imitating incandescent lamp behavior, rather complex solutions result for the realization.
    An object of the invention is to provide an LED light module that can be easily connected to a generally regulated power source, where "intelligent" the corresponding bin classification is automatically taken into account.
    This object is achieved with an LED light module of the type mentioned, in which according to the invention parallel to the partial current of the total current leading LED branch, an analog controller is connected for branching a partial flow, wherein the
    Analog controller is supplied as reference a signal corresponding to the total current, and as a controlled variable, a signal is supplied, which is proportional to one of the partial streams and is supplied by the device for identification of the Bin class.
    In the module according to the invention, LEDs or LED combinations of a standardized type can be easily used, whereby the exchange of modules is easily possible, since "intelligent" consideration is given to the binning or the respective binning class The present invention is intended to cover the term "LED" light-emitting diodes of any kind, which are suitable for use in bulbs for vehicles in question, for example, laser diodes alone or in combination with light-converting agents or substances ("phosphor").
    In an expedient variant of the invention, it is provided that the controlled variable is proportional to the diverted by the analog controller partial flow. In this case, it may be expedient if a resistor is arranged in the branch of the analog controller for identifying a bin class and the voltage drop occurring at this is fed to the analog controller as a controlled variable.
    In another possible and practically proven training is provided that the controlled variable is proportional to the flowing through the LED branch partial flow. In this case, it can be advantageously provided that a resistor is arranged in the LED branch for identifying a bin class and the voltage drop occurring at the latter is fed to the analog controller as a controlled variable.
    The invention also shows the advantage of a more uniform load on the power supply when the power supply has a control input to which a control signal for dimming / switching of the LEDs of the LED light module can be fed.
    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 shows a first example embodiment LED light module according to the invention and
    2 shows a variant of the LED light module according to FIG. 1.
    In the first variant of an LED light module according to the invention shown in Fig. 1, a voltage source Ue is shown, which is, for example, the accumulator of a motor vehicle, in the present case this voltage source Ue is a boost converter 1 downstream, in which only schematically a reactor L, a switching transistor TI, a rectifier diode Dl and a capacitor C are shown. Such or another power supply is provided in a vehicle, belongs to the prior art and is not the subject of the invention. The power supply provides an output voltage Ua and supplies a module M according to the invention with a total current Ig.
    In the module or on the module, a sensor resistor Rs is located in a series branch of light emitting diodes LED1 ... LEDn, wherein via the module, when suitably arranged in the vehicle and connected to the power supply, the total current Ig from a first terminal flows to a second port.
    The serial branch of the light-emitting diodes, hereinafter referred to as LED branch Z, contains a number of light-emitting diodes adapted to the supply voltage Ua, in the simplest case a single light-emitting diode.
    The LED light module according to the invention can be used for a motor vehicle headlight, a flashing light, an auxiliary headlight or interior lighting.
    According to the invention, a controlled or regulated parallel circuit is now arranged to the series circuit of the LEDs, which is designed as an analog, preferably linear current regulator and in the present case a lying parallel to the light-emitting diode series branch transistor T2, z. As a FET, with the series resistance Rr is located. The resistor Rr is provided as a component for identifying the Bin class of the LED module M and matched to the mounted on the module M LEDs LED1 ... LEDn.
    Of the total and with the sensor resistance Rs detected current Ig part flows through the LED branch as current Id and a part via the parallel branch as current Ib, here via the transistor T2. The transistor is controlled by an operational amplifier 3, to which the following quantities are supplied: on the one hand as a control variable Ur, one to the branched off
    Current Ib proportional, occurring at the resistor Rr voltage Ur and on the other hand, the output of a differential amplifier 4, which supplies a voltage Us, which is the total current Ig flowing through the sensor resistor Rs, which is located at the input of the differential amplifier 4 proportional. The operational amplifier 3 can be supplied by the voltage which lies on the LED branch Z, either directly or, as shown in FIG. 1, from a power supply module 5, for example an LDO (Low-Dropout Regulator).
    The voltage at the reference input of the operational amplifier 3 is defined by the total current Ig, which is specified by the upstream controller, here the up-converter 1. If this current is reduced or increased, the voltage at the reference input of the operational amplifier 3 also increases.
    The resistor Rs provides the reference voltage that depends on the total current Ig. Now, if the current through the transistor branch Z and thus the voltage drop across Rr is higher than the reference voltage, the transistor is closed more until an equilibrium is established. The opposite is true in the case where the voltage drop across Rr is too low.
    The resistor Rr must be matched to the populated LEDs, i. it serves as a device for identifying the bin class of the module M.
    For a better understanding, a numerical example is given:
    The total output current Ig of the power supply is 1A and that of the resistor Rs is 1 ohm. The voltage drop across Rs is then 1A x 10 ohms = IV.
    If the populated LEDs need 1A to generate the defined brightness, the parallel control is not in operation and consequently does not have to be equipped on the light module.
    However, if the populated LEDs LED1 ... LEDn need only 0.6A, i. 0.4A must flow in the branch of transistor T2, the bin classifying resistor Rr is chosen to be 1 / 0.4 ohms (2.5 ohms) because 2.5 ohms x 0.4A = IV.
    The advantage here in this variant is that only the power loss that actually has to be "destroyed" and no additional power loss is caused by the bin-classifying resistor.
    The variant of the invention shown in Fig. 2 corresponds essentially to the arrangement of FIG. 1, wherein the same reference numerals are used for the same or similar elements. The difference to the module according to FIG. 1 is that in this case the resistor Rr-, from which a voltage Ur- is accepted as a control variable, is located in the series branch of the light-emitting diodes LED1... LEDn. In this embodiment, the component for identifying the bin class of the light module M, the resistor Rr-, which, mutatis mutandis to the embodiment of FIG. 1, for example, together with the LEDs LED1 ... LEDn on a circuit board, such as a board / Circuit board can be arranged, wherein the entire module is designed in a convenient manner for easy replacement.
    The function of the arrangement according to FIG. 2 is the same as in the arrangement according to FIG. 1. Also in this variant, the resistance Rs provides the reference voltage, which is dependent on the total current Ig. In this variant, the resistor R'r defines the bin class of the installed LEDs and is arranged in the serial branch of the LEDs LED1... LEDn. If the current through the LED branch and thus the voltage drop across R'r are higher than the reference voltage is opened, the transistor T2 more until an equilibrium is established. The opposite is true in the case where the voltage drop across R'r is too low.
    For a better understanding, here too a numerical example is given, again the total output current Ig of the power supply 1A and that of the resistor Rs being 1 ohm. The voltage drop across Rs is then 1A x 10 ohms = IV.
    If the populated LEDs 1A need to generate the defined brightness, the parallel control is not in operation and, consequently, it does not even have to be equipped on the light module.
    However, if the populated LEDs require 0.6A, the bin-classifying resistor R'r is chosen to be 1 / 0.6 ohms (1.66670hms) because 1.6667 ohms x 0.6A = IVs.
    The disadvantage here is the additional power loss at the bin resistor R'r and the "optimized" variant is accordingly a variant with a bin-classifying resistor in the branch of the analog controller, in these examples more precisely in the branch of the transistor T2.
    It is thus to be noted that the arrangement according to FIG. 1 is in many cases to be preferred, since in this arrangement only that charge is converted into heat which has to be dissipated due to the brightness pins of the FEDs, whereas in the embodiment according to FIG. 2 of the loss-generating resistor sits in the LED series branch and there may not produce desirable losses, which in the individual case, of course, depends on the Feistung the FEDs or the current Id in the series circuit. For the function, it does not matter where the resistor is positioned. In both cases it is regulated to a certain FED current Id, in the examples described to 0.6 A.
    In general, a resistor is suitable as a bin class identifying device of the spruce module M, however, to give another example, another current controlled voltage source could be used for this purpose, e.g. a device with a nonlinear current / voltage characteristic.
    It should also be noted that the voltage / power supply of the inventive FED module M, which in the present example is a step-up converter, can be supplied with a control signal Sd which, for example, serves for dimming the dampener diodes or blinking, i. a periodic switching on and off caused, etc. Thanks to the invention, a dimming of the LEDs of the module is just as easily possible as a periodic on / off, for example.
    权利要求:
    Claims (5)
    [1]
    claims
    1. LED light module (M) for a lighting device for vehicles having at least one LED branch with at least one LED (LED1 .... LEDn), wherein on the module at least one component (Rr, R'r) for identifying a Bin class is arranged, and the module for operation with a total current (Ig) is set up, characterized in that parallel to the partial current (Id) of the total current (Ig) leading LED branch (Z) an analog controller (3, T2) is connected to branch off a partial flow (Ib), wherein the analog controller as reference a signal (Us) is supplied, which corresponds to the total current (Ig), and as a control variable, a signal (Ur) is supplied, which one of the partial streams (Ib , Id) is proportional and supplied by the device (Rr, R'r) for identifying the Bin class.
    [2]
    2. LED light module (M) according to claim 1, characterized in that the controlled variable is proportional to the diverted by the analog controller (3, T2) partial flow (IB).
    [3]
    3. LED light module (M) according to claim 2, characterized in that in the branch of the analog controller (3, T2) for identifying a Bin class, a resistor (Rr) is arranged and occurring at this voltage drop (Ur) the analog controller supplied as a controlled variable.
    [4]
    4. LED light module (M) according to claim 1, characterized in that the controlled variable is proportional to the by the LED branch (Z) flowing partial stream (Id).
    [5]
    5. LED light module (M) according to claim 4, characterized in that in the LED branch (Z) for identifying a bin class, a resistor (R'r) is arranged and occurring at this voltage drop (U'r) the analog controller (3, T2) is supplied as a controlled variable.
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    引用文献:
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    法律状态:
    2016-11-15| HC| Change of the firm name or firm address|Owner name: ZKW GROUP GMBH, AT Effective date: 20161014 |
    优先权:
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    US15/578,725| US20180105099A1|2015-06-01|2016-05-30|Led light module for a lighting device for vehicles|
    EP16728602.0A| EP3305026A1|2015-06-01|2016-05-30|Led light module for a lighting device for vehicles|
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