• 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 light-emitting diode chain with a plurality of series-connected, powered by a power source LEDs (LED1 .... LED4), wherein each LED is associated with a drive circuit (5), which connected in parallel to the LED series circuit of a reference voltage sink (Dl) of the voltage ( Uref) and a controlled switch (Q) and which is adapted to the control voltage (Ust) on a control circuit common to all control circuits (4), measured against a base of the LED series circuit, with the voltage at the junction of the switch with the to compare subsequent LED of the chain or the base and close the switch or open, if the control voltage (Ust) falls below a predetermined value or rises above a predetermined value.
    公开号:AT512603A1
    申请号:T50041/2012
    申请日:2012-02-24
    公开日:2013-09-15
    发明作者:Daniel Petsch
    申请人:Zizala Lichtsysteme Gmbh；
    IPC主号:
    专利说明:

    P12472 led control for running light turn signals
    The invention relates to a light-emitting diode chain with a plurality of series-connected, powered by a power source LEDs.
    Running light circuits with LEDs are known, wherein the individual LEDs each lie with one electrode on a common feed line and with the other electrodes on supply lines, which are fed by a clock. This means a high amount of wiring, since with a number n of LEDs (n + 1) individual lines are required.
    It is an object of the invention to reduce the wiring complexity for a light-emitting diode chain and to offer a solution which is also suitable for practice with little effort, in particular also suitable for motor vehicle applications.
    This object is achieved with a light-emitting diode chain of the type mentioned, in which according to the invention each LED is assigned a drive circuit which has a parallel to the LED series connection of a reference voltage drop of the voltage Uref and a controlled switch and which is adapted to the control voltage Ust at a Compare all drive circuits common control line, measured against a base of the LED series circuit, with the voltage at the connection of the switch with the subsequent LED of the chain or the base point and close the switch, or open, if the control voltage (Ust ) falls below a predetermined value or rises above a predetermined value.
    Thanks to the invention, only three lines for the light-emitting diode chain are required, regardless of the number of LEDs used. The simple and cheap drive circuit can be constructed in the smallest space directly at the light emitting diode.
    A practical variant is characterized in that the drive circuit bridges the light-emitting diode with the series connection of the reference voltage sink and the switching path of a controlled semiconductor switch, wherein the sum of reference voltage and forward voltage of the semiconductor switch is smaller than the forward voltage of the light emitting diode, and a control line common to all light emitting diodes is that at the -2- PI2472
    Output of a voltage ramp generating ramp generator is connected to the control inputs of all semiconductor switches.
    In an expedient embodiment, the reference voltage sink is formed by at least one reference voltage diode, wherein advantageously the reference voltage diode is a Zener diode
    In a practical variant, it is provided that the semiconductor switches (Q1) are transistors, in particular MOSFETs.
    In order to protect especially MOSFETs from an unintentionally high gate-source voltage, it is expedient if the control path of the semiconductor switch is bridged by a protective diode, which is advantageously a Zener diode.
    To make sure that the semiconductor switch reliably switches off, it can be provided that a resistor is connected in parallel with the protective diode.
    In terms of a protection of the semiconductor switch from excessive voltages in conjunction with the protective diode, it is advantageous if there is a protective resistor between the control input of the semiconductor switch and the control line.
    If an isolation diode is connected between the control line and the control inputs of the semiconductor switches, feedback effects of the control electronics via the control line are avoided.
    Although in principle any ramp shapes are possible, it also makes sense in the sense of a definable dimensioning if the ramp generator is set up to generate a linearly increasing / decreasing voltage ramp
    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 is a block diagram of the basic structure of a light-emitting diode chain according to the invention,
    2 shows the circuit diagram of a drive circuit of a light emitting diode of a LED chain,
    FIGS. 3 to 7 show various stages of operation of an exemplary light-emitting diode chain with four light-emitting diodes,
    8 shows a diagram of the time profile of a falling control voltage and the number of each luminous LEDs of a chain with four LEDs,
    9 is a diagram as in FIG. 8, but with increasing control voltage and
    10 shows a diagram of the time profile of a falling control voltage and the increase in the brightness of the LEDs.
    Fig. 1 shows the structure of a light-emitting diode chain 1 according to the invention: A current source 2 supplies a current Iled and feeds in this example, four series-connected LEDs LD1 to LD4 against a foot or ground point 3. In the light-emitting diodes LED1 ... LED4 of LED string does not necessarily have to be a single light emitting diode, it may be provided in place of a light emitting diode also series and / or parallel circuits of light emitting diodes. A dashed line between the ramp generator 5 and the power source 2 is intended to indicate that optionally an additional control of the current Iled can take place.
    Each light-emitting diode LED1 .... LED4 is assigned a drive circuit AS1 to AS4 which has a series connection, connected in parallel to the associated light-emitting diode, of a reference voltage sink Ds of the voltage Uref and a controlled switch Q.
    A control line 4 which is common to all drive circuits AS1 to AS4 is connected to the output of a ramp generator 5 and is connected to the control inputs of the controlled switches via a comparator circuit 6 of the drive circuits symbolically drawn here. Here, each Ansteuersehaltung is adapted to a control voltage U * t, which is located on the control line 4, measured against a foot point 3, with the voltage UF1 to UF4 at the junction of the switch Q with the subsequent light-emitting diode LD2 of the chain or the foot point 3rd and to close the switch Q, if the control voltage U * t falls below a predetermined value or to open the switch Q, if the control voltage rises above a predetermined value. -4- P12472
    Since all drive circuits are identical, a field-proven embodiment of a drive circuit will be described below in detail with reference to FIG. 2, which may be associated with the first LED LED1 of the chain.
    Parallel to the LED LED1 is the series connection of two diodes connected in the forward direction, which are denoted overall by Dl and form a reference voltage sink, with the switching path DS of a MOSFET Q, the source S at the cathode of the LED LED1 and its drain D at the cathode of the diode The gate of the transistor Q is connected via the series connection of a protective resistor RI and an isolating diode D2 to the control line 4. Source S and gate G of the MOSFET Q are bridged on the one hand by a Zener diode D3 and on the other hand by a resistor R2.
    The isolation diode D2 prevents repercussions on the respective remaining circuits of the light-emitting diode chain 1 and the protective resistor RI prevents in combination with the zener diode D3 harmful high voltages at the gate-source path of the MOSFET. The resistor R2 ensures that the MOSFET switch can be turned off despite the presence of the diode D2. The diode Dl also has the task to compensate for the unavoidable gate-source voltage tolerances of the MOSFET Ql and to take into account the fact that a FET has no exact Schaltpuhkt
    The voltage values given below are merely intended to better explain the function of the invention and depend on the components used and the circuit dimensioning. In the illustrated embodiment, the two, the reference voltage diode Dl forming diodes, for example, Schottky diodes with a typical forward voltage of 0.6 volts, so that the reference voltage Uief the reference voltage sink Dl at rated current of the LEDs is 1.2 volts. The zener voltage of the zener diode D3 is 8.2 volts, the forward voltage of the diode D2 0.6 volts. The MOSFET Q is typically conducting from a gate-source voltage of 2 volts. The forward voltage of the LEDs is typically 2 volts
    With further reference to Figures 3 to 7, the function of a four-stage LED array will now be explained, it being understood by those skilled in the art that the invention is not limited to a particular number of light emitting diodes and more with appropriate sizing or less than four stages can be provided.
    In a first phase according to FIG. 3, the control voltage Ust is 6.5 volts. The voltage at the junction of the switches Q with the subsequent LED of the chain or base is 3.6 volts, 2.4 volts 1.2 volts and 0 volts, respectively. The gate-to-source voltage of each MOSSFET is greater than 2 volts, 2.3 volts, 3.5 volts, 4.7 volts, and 5.9 volts for the first through fourth stages, so all MOSFETs Q are turned on and their drain -Source voltage is approximately at 0 volts. At the LEDs LED1 to LED4 is ever a voltage of 1.2 volts, substantially corresponding to the reference voltage U ^ f. This voltage is well below the forward voltage of the LEDs of 2 volts, it lights no LED. In the diagram of FIG. 8, this corresponds to the starting point of the falling voltage ramp.
    In FIG. 4, the control voltage Ust has fallen to 5.5 volts, the gate-source voltage of the first-stage MOSFET is only 1.3 volts, the first-stage switch Q is off, and the first light-emitting diode LED 1 is lit in FIG. 5 is the control voltage Ust dropped to 4.3 volts, the gate-source voltage of the first stage MOSFETs is only 0.1 volts, that of the second stage MOSFET only 1.3 volts, therefore, the switch Q locks the second stage and the second LED LED1 lights as well as the first LED LED 2nd
    In Fig. 6, the control voltage Usi has dropped to 3.1 volts, the gate-source voltage of the first-stage MOSFET is 0 volts, that of the second-stage MOSFET is only 0.1 volts, and that of the third-stage MOSFET is only still 1.3 volts, therefore, now also the switch Q of the third stage and the third LED lights LED3 lights as well as the first and second LEDs LED 1 and LED. 2
    In the phase shown in FIG. 7, all the LEDs LED1 to LED4 light up, since with a control voltage Ust of less than 1.9 volts, the gate-source voltages at the MOSFETs of the individual stages (in the drawing from top to bottom ) now be 0 volts, 0 volts, 0 volts and 1.3 volts. -6- P12472
    Overall, the described mode of operation in the case of a control voltage Ust generated, for example, linearly falling, by the ramp generator 5, leads to a running, the light-emitting diode chain "filling". Light impression arises. Reference is again made to Fig. 8, which demonstrates this operation for a period of 200 ms. As already mentioned, the course of the control voltage can also follow other arbitrary functions instead of a linear function.
    Fig. 9 shows the opposite to Fig. 8 course with decreasing control voltage. In operation, all combinations and modifications are possible, e.g. a sawtooth-shaped or triangular course of the control voltage with corresponding light effects of the light-emitting diode chain.
    Finally, FIG. 10 is intended to illustrate the dependence of the luminosity of the four light-emitting diodes used in the example, even when the control voltage Ust is falling.
    Not shown in detail is the possibility already indicated above of controlling the current source 2 to a certain extent by the ramp generator 5, so that further effects can be achieved, e.g. one at "refill" the chain increasing brightness of the LEDs.
    Vienna, February 24, 2012
    权利要求:
    Claims (12)
    [1]


    P12472 -7- CLAIMS 1. LED chain with a plurality of series-connected, powered by a power source LEDs (LED1 .... LED4), characterized in that each LED (LED1 .... LED4) is associated with a drive circuit (5) , which has a parallel to the light emitting diode connected in series circuit of a reference voltage sink (Dl) of the voltage (UÄf) and a controlled switch (Q) and which is adapted to the control voltage (Ust) on a common control circuits control line (4), measured against a Base point of the LED series circuit to compare with the voltage at the connection of the switch with the subsequent LED of the chain or the foot point and close the switch or open, if the control voltage (Ust) falls below a predetermined value or over a predetermined value increases.
    [2]
    2. LED array according to claim 1, characterized in that the drive circuit bridges the light emitting diode with the series circuit of the reference voltage sink (Dl) and the switching path of a controlled semiconductor switch (Q), wherein the sum of reference voltage (U «f) and forward voltage (Ud) of Semiconductor switch is smaller than the forward voltage of the light emitting diode (LED1), and the common control line (4) at the output of a voltage ramp generating ramp generator (5) and is connected to the control inputs of all semiconductor switches.
    [3]
    3. LED array according to claim 1 or 2, characterized in that the reference voltage sink (Dl) is formed by at least one reference voltage diode.
    [4]
    4. light-emitting diode chain according to claim 3, characterized in that the reference voltage diode (Dl) is a Zener diode.
    [5]
    5. light-emitting diode chain according to one of claims 1 to 4, characterized in that the semiconductor switches (Q) are transistors. -8- P12472
    [6]
    6. LED array according to claim 5, characterized in that the semiconductor switches are MOSFETs.
    [7]
    7. LED array according to one of claims 1 to 6, characterized in that the control path (G-S) of the semiconductor switch (Q) by a protective diode (D3) is bridged.
    [8]
    8. light-emitting diode chain according to claim 7, characterized in that the protective diode (D3) is a Zener diode.
    [9]
    9. LED array according to claim 7 or 8, characterized in that parallel to the protective diode (D3), a resistor (R2) is connected.
    [10]
    10. light-emitting diode chain according to one of claims 1 to 9, characterized in that between the control input of the semiconductor switch (Q) and the control line, a protective resistor (RI) is located.
    [11]
    11. light-emitting diode chain according to one of claims 1 to 10, characterized in that between the control line (4) and the control inputs of the semiconductor switch (Q) each have a separating diode (D2) is connected
    [12]
    12. LED array according to one of claims 1 to 11, characterized in that the ramp generator (5) is arranged to generate a linearly rising / falling voltage ramp. Vienna, February 24, 2012
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