• 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:
    An illumination circuit (200) is configured to control a light source (300) comprising a plurality of light emitting elements (302-1 to 302_N) connected in series. The lighting circuit (200) comprises a plurality of branch switches (SWB1 to SWBN) respectively connected in parallel with the light-emitting elements (302-1 to 302_N), a switching converter (210), and a circuit converter control unit (500) configured to (i) stabilize a fire current generated by the switching converter (210) at a first target amount in an ignition state where at least one of the plurality of elements light emission (302-1 to 302_N) is turned on, and to (ii) stabilize the fire current at a second target quantity smaller than the first target amount in a complete extinction state where all the elements of the plurality of light emitting elements (302-1 to 302_N) are extinguished.
    公开号:FR3066876A1
    申请号:FR1854391
    申请日:2018-05-24
    公开日:2018-11-30
    发明作者:Satoshi Kikuchi；Tomoyuki Ichikawa
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    Aspects of the present invention relate to a lighting circuit of a semiconductor light source.
    [0002] A vehicle light can generally switch between a low beam and a high beam. The dipped beam provides a predetermined illumination for a neighboring area and has a light distribution designed not to dazzle an approaching vehicle or a preceding vehicle, so that the dipped beam is mainly used during displacement in urban areas.
    The high beam headlamp provides strong illumination for a wide and distant area before and is mainly used when traveling at high speed on a road with few vehicles approaching or previous vehicles. Therefore, although the high beam will give a driver better visibility than the low beam, the high beam will dazzle a driver of a previous vehicle or a pedestrian on a front side of the vehicle.
    In recent years an adaptive driving beam technique (ADB) has been proposed which controls a light distribution configuration of a high beam headlamp dynamically and adaptively based on the conditions surrounding the vehicle. The ADB technique reduces the glare of a vehicle or a pedestrian by detecting the presence of a preceding vehicle, an approaching vehicle or a pedestrian on a front side of the vehicle and by reducing or turning off lights for an area corresponding to the detected vehicle or pedestrian.
    Figure 1 is a block diagram of a 100R vehicle fire studied by the inventors of the present application. The vehicle light 100R includes a lighting circuit 200R and a light source 300.
    The light source 300 comprises a plurality (N; N> 2) of light emission elements 302_l to 302_N. The lighting circuit 200R is configured to independently control the switching on / off of the light source 300 by a bypass method. The lighting circuit 200R comprises a constant current circuit 202R, a bypass circuit 280, and a bypass control circuit 290.
    The constant current circuit 202R generates an Ilamp pilot current (fire current) stabilized at a target value. The bypass circuit 280 includes a plurality of bypass switches SWBi to SWBN. A bypass switch SWBi (1 <i N) is provided between the two ends of a corresponding light emitting element 302__i. The bypass control circuit 290 controls the ON / OFF of the plurality of bypass switches SWBi to SWBN individually so as to obtain a desired light distribution configuration. When an i th bypass switch SWBi is turned off, the fire current Ilamp flows in the light emitting element 302_i, and therefore, the light emitting element 302_i changes to an ignition state. When the i th bypass switch SWBi is turned on, since the fire current 1 ^ »flows through the bypass switch SWBi and no current flows in the light emitting element 302_i, the emitting element light 302__i goes to an extinct state. The constant current circuit 202R comprises a switching converter 204, a detection resistance Rs, a current detection circuit 206, and a converter control circuit 208.
    The detection resistance Rs is provided on a passage of the fire current Ilamp, and a voltage drop proportional to the fire current Ilm is generated between the two ends of the detection resistance Rs. The current detection circuit 206 generates a current detection signal VCS on the basis of the voltage drop of the detection resistance Rs.
    The switching converter 204 is a step-down converter or a step-up converter. The converter control circuit 208 controls the switching converter 204 so that the detection signal Vcs approaches a reference voltage VREF corresponding to the target value of the fire current. For example, the document JP-A-2014-180099 describes a lighting control device.
    The inventors of the present application have identified the following problems after studying the vehicle fire 100R in FIG. 1.
    There may be a period during which all the elements of the plurality of light emitting elements 302_l to 302_N are stopped (complete extinction state) according to a light distribution configuration. It is possible to obtain a complete extinguishing state long enough by stopping the constant current circuit 202R to set the fire current Ilamp to zero. However, in a situation where a short complete extinction state occurs repeatedly (for example, a situation where a PWM command is carried out on each bypass switch of the bypass circuit 280), the constant current circuit 202R cannot be stopped in the complete extinction state. This is due to the fact that a delay occurs when the constant current circuit 202R is stabilized in an operating state from the stopped state and the fire current Ilamp is not stabilized at the target current during the delay , so that the brightness of the light emitting elements becomes unstable. Therefore, it is necessary that the constant current circuit 202R continues to generate a constant fire current Ilamp even in the state of complete extinction.
    In the complete extinction state, if the switching operation of the switching converter 204 is maintained, the same amount of lamp current IREf as that in a normal ignition state continues to flow in a transistor of Mi switching and SWB bypass switches. Consequently, the lighting circuit 200R consumes electrical energy even though the light source is stopped, which generates heat generation of the transistors configuring the bypass switches SWB. In addition, a transistor which is capable of withstanding heat is of large size and of high cost.
    The present invention was made due to the above circumstances, and an aspect of the present invention provides a lighting circuit which is configured so that a switching operation of a switching converter can be maintained which can reduce energy consumption in a state of complete extinction.
    According to one aspect of the present invention, there is provided a lighting circuit configured to control a light source comprising a plurality of light emitting elements connected in series. The lighting circuit comprises a plurality of bypass switches respectively connected in parallel to the light emitting elements; a switching converter; and a converter control circuit configured to stabilize a fire current generated by the switching converter at a first target quantity in an ignition state where at least one of the plurality of light emitting elements is lit , and to stabilize the fire current at a second quantity of target smaller than the first quantity of target in a state of complete extinction where all the elements of the plurality of light emitting elements are extinguished.
    According to this configuration, since the current flowing in the plurality of bypass switches can be reduced in the state of complete extinction, the generation of heat can be reduced. Also, since the amount of heat generation is reduced, inexpensive parts which are small in size can be chosen.
    The converter control circuit may comprise a first control circuit configured to generate a first control pulse by means of a control method with relatively high precision in the ignition state, a second control circuit configured for generating a second control pulse by a control method with relatively low precision in the complete extinction state, and a control circuit configured to control the switching converter according to the first control pulse and the second command pulse.
    The lighting circuit may further comprise a determination circuit which is configured to compare a voltage across the terminals of the light source with a threshold voltage and to determine that the light source is in the state of complete extinction if the voltage across the light source is below the threshold voltage.
    The lighting circuit may further comprise a bypass control circuit configured to control the plurality of bypass switches; and a determination circuit configured to detect the complete extinction state based on a control signal from the bypass control circuit.
    According to another aspect of the present invention, a vehicle light is provided. The vehicle light includes the light source which includes the plurality of light emitting elements connected in series; and the lighting circuit described above configured to turn on the light source.
    The vehicle light may further comprise a scanning optical system configured to receive light emitted by the light source and scan the front of the vehicle.
    Furthermore, any combination of the above configuration items, and the configuration items and substituted expressions in the methods, apparatus, systems, or equivalent are also relevant as aspects of the present invention .
    According to the above configuration, a generation of heat can be reduced in the state of complete extinction.
    Figure 1 is a block diagram of a vehicle fire studied by the inventors.
    Figure 2 is a block diagram of a light system comprising a vehicle light according to an embodiment of the present invention.
    FIG. 3 is a diagram of the operating waveform of the vehicle light in FIG. 2.
    Figure 4 is a block diagram of a lighting circuit according to an embodiment of the present invention.
    FIG. 5 is a diagram showing an example of a specific configuration of a converter control circuit.
    FIG. 6 is a diagram intended to illustrate overcurrent protection by a second control circuit.
    Figure 7 is a simplified block diagram of an integrated control circuit.
    FIG. 8 is a circuit diagram of a lighting circuit comprising the integrated control circuit of FIG. 7.
    Figure 9 is a perspective view of a scanning type vehicle light.
    Figures 10A to 10D are diagrams intended to illustrate the formation of light distribution patterns.
    Embodiments of the present invention will be described below with reference to the drawings. Identical or equivalent components, elements, and methods shown in each drawing are given the same references, and repeated descriptions are appropriately omitted. In addition, the embodiments are not intended to limit the scope of the present invention and are for illustration only, and all of the features described in the embodiments and combinations thereof are not necessarily features essential of the present invention.
    In the description, "a state where an element A is connected to an element B" includes not only a case where the element A and the element B are physically and directly connected, but also a case where the element A and element B are connected indirectly via other elements without causing substantial effects on an electrical connection state of these or affecting functions or effects due to their connection.
    Similarly, "a state where an element C is provided between an element A and an element B" includes not only a case where the element A and the element C, or the element B and l element C, are linked directly, but also a case where element A and element C, or element B and element C, are connected indirectly via other elements without causing effects substantial on an electrical connection of these or affect functions or effects due to their connection. Similarly, in the description, references given to electrical signals such as voltage signals and current signals, or circuit elements such as resistors and capacitors represent voltage values and values of current, or resistance values and capacitance values if necessary.
    Figure 2 is a block diagram of a light system 1 comprising a vehicle light 100 according to an embodiment of the present invention. The light system 1 comprises a battery 2, an electronic vehicle control unit (ECU) 4, and a vehicle light 100. The vehicle light 100 receives a DC voltage (battery voltage) VBAT from the battery 2 The vehicle light 100 is connected to the electronic vehicle control unit 4 via a control circuit network (CAN), a local interconnection network (LIN), or the like.
    The vehicle light 100 includes a lighting circuit 200, a light source 300, and an electronic fire control unit 400. the electronic fire control unit 400 is connected to the electronic control unit vehicle 4 and controls the lighting circuit 200 based on control signals or information from the vehicle electronic control unit 4. In addition to the on / off instructions, information indicating conditions of the vehicle or its surroundings is also transmitted from the electronic vehicle control unit 4 to the electronic light control unit 400. The information contains vehicle position information previous and pedestrian, vehicle speed, or equivalent.
    The electronic fire control unit 400 includes a switch 402 and a processor 404. The switch 402 is provided on a supply passage of a supply voltage from the battery 2 to the lighting circuit 200. The processor 404 is a central processing unit (CPU) or a microcomputer, and controls the switch 402 on the basis of start / stop instructions of the electronic vehicle control unit 4. When the switch 402 is turned on in response to a start command from one side of the vehicle, power is supplied to the lighting circuit 200. Based on the information from the electronic control unit of vehicle 4, the processor 404 determines a light distribution configuration and controls the lighting circuit 200.
    The light source 300 comprises a plurality (N; N> 2) of light emission elements 302_l to 302_N. The lighting circuit 200 is configured to independently control the start / stop of the light source 300 by a bypass process.
    The lighting circuit 200 includes a constant current circuit 202, a bypass circuit 280, and a bypass control circuit 290, which is similar to the lighting circuit 200R of Figure 1. The bypass circuit 280 and the bypass control circuit 290 are similar to those of FIG. 1. The function of the bypass control circuit 290 can be implemented in the processor 404.
    The constant current circuit 202 includes a switching converter 210 and a converter control circuit 500. The switching converter 210 is a step-down converter, a step-up converter, or a step-down converter from Cuk.
    The converter control circuit 500 controls the switching converter 210 so that a fire current Ilamp approaches an amount of target IREF thereof. More specifically, the converter control circuit 500 is configured to (i) stabilize a fire current Ilamp generated by the switching converter 210 at a first quantity of target Irefi in an ignition state where at least one element of the plurality of light emitting elements 302 is lit, and to (ii) stabilize the fire current Ilamp at a second quantity of target Iref2 smaller than the first quantity of target Irefi in a state of complete extinction where all the elements of the plurality of light emitting elements 302 are turned off.
    For example, on an output side of the switching converter 210, a current detection unit 211 is provided for directly monitoring the fire current Ilamp and generating a first detection signal VCSi as a function of the fire current Ilamp · The current detection unit 211 can be a combination of the detection resistance Rs and the current detection circuit 206 of FIG. 1. The current detection unit 211 can detect a fire current Ilamp on one side d anode (top side) of the light source 300, or can detect the Ilamp fire current on one side of the cathode (bottom side) of the light source 300.
    The converter control circuit 500 comprises a control circuit 502, a control circuit 530, and a determination circuit 540. The determination circuit 540 determines whether the light source is in the lighting state or in the complete extinction state and generates a DET determination signal indicating the determination result. For example, the determination signal DET is at a low level in the lighting state and is at a high level in the switching off state.
    When the determination signal DET indicates the lighting state, the control circuit 502 generates a first control pulse SCNTi so that the fire current Ilamp indicated by the first detection signal Vcsi approaches the first quantity of current Irefi- When the determination signal DET indicates the state of complete extinction, the control circuit 502 generates a second control pulse SCnt2 so that the fire current Ilamp indicated by the first detection signal VCsi approaches the second quantity of current Iref2 · On the basis of the control pulses SCNT1 / SCNT2 delivered by the control circuit 502, the control circuit 530 generates a gate control signal SGATE to control the switching converter 210 .
    The configuration of the vehicle light 100 has been described above, and the operation thereof will be described below.
    FIG. 3 is a diagram of the operating waveform of the vehicle light 100 of FIG. 2. Here, N = 3. In a period To, all the bypass switches SWBi to SWB3 are stopped, and all the elements d light emission 302_l to 302_3 emit light. At this time, the output voltage Vo of the switching converter 210 becomes 3 χ VF. VF is a direct voltage of the light emitting elements 302. Furthermore, the fire current Ilamp is indicated by a straight line, but undulations can be included.
    In a period Ti, the bypass switch SWBi is turned on, and the light emitting element 302_l is stopped. At this time, the output voltage Vo of the switching converter 210 becomes 2 χ VF. In a period T2, the bypass switches SWBi and SWB2 are turned on, and the light emitting elements 302_l and 302_2 are turned off. At this time, the output voltage Vo of the switching converter 210 becomes 1 χ VF.
    During periods To to T2, the light source is in the lighting state where at least one of the light emitting elements 302 is on, so that the DET determination signal is at a level low. Consequently, the switching converter 210 is controlled as a function of a gate control signal SGATE corresponding to the first control pulse SCNTi, and the fire current Ilamp is stabilized at the first quantity of target Irefi · [0043] In a period T3, all the bypass switches SWBi to SWB3 are stopped and the light source is in the complete extinction state where all the light emitting elements 302_l to 302_3 are off, so that the signal DET determination is at a high level. The switching converter 210 is controlled as a function of a door control signal SGate corresponding to the second control pulse SCnt2z and the fire current Ilamp is stabilized at the second target quantity Iref2 · In a following period T4 , when the bypass switch SWBx is off, the output voltage Vo becomes 1 * VF. Then, the switching converter 210 is controlled as a function of the first control pulse SCNTi and the fire current Ilamp is stabilized at the first target quantity Irefi · The operation of the vehicle light 100 has been described above , and the operation of the vehicle light 100 will be appreciated more clearly by comparison with the following comparative technique. In the comparative technique, the switching converter 210 is completely stopped and the fire current Ilamp becomes zero in the fully extinguished state T3. Usually, since a soft start command is performed when operation resumes after the switching converter 210 is completely stopped, there is a significant delay when the fire current Ilamp returns to a first target current.
    On the contrary, according to the vehicle light 100 of the embodiment, even in the complete extinction state T3, the switching operation of the switching converter 210 can be continued as a function of the second control pulse. SCnt2z and Ilamp fire current can be maintained to be non-zero. Thus, at a next time when the light emitting elements 302 are turned on, the light emitting elements 302 can be turned on quickly without a soft start command.
    The Ilamp fire current in the fully extinguished state T3 does not contribute to the emission of light from the light emission elements 302 and is unnecessarily consumed. Since the second amount of target IREf2 is set to be less than the first amount of target Irefi, it is possible to reduce the power consumption in the bypass circuit 280, which in turn reduces the amount of heat generation. This means that it is possible to choose small and inexpensive parts with a smaller heat capacity as SWB bypass switches.
    The inventive concept of the present invention can be applied to different devices, circuits, and methods implemented from the functional diagram and the circuit diagram of Figure 2 or derived from the description above, and n ' is not limited to the particular configuration. Below, in order to facilitate understanding and clarification of one aspect of the invention and the operation of the circuit, more specific embodiments and modifications will be described in detail, which is not intended to reduce the scope of the present invention.
    Figure 4 is a block diagram of a lighting circuit 200A according to an embodiment of the present invention. The switching converter 210 is a step-down converter and comprises a switching transistor Μχ, an inductance Li, and a rectifying element ϋχ. A first current detection unit 212 comprises a first detection resistance RSx provided on a passage of the fire current Ilamp, and a first current detection circuit 216 for converting a voltage drop from the first detection resistance RSi into a first detection signal VCSi.
    The converter control circuit 500A generates the first control pulse SCNT1 on the basis of the first detection signal VCSi generated by the first current detection unit 212 in the lighting state. In FIG. 4, the first detection resistance RS1 is inserted on the anode side (high side) of the light source 300, and the power supply of the first current detection circuit 216 comes from the output Vo of the converter. switching 210. Since a voltage VL through the light source 300 (the bypass circuit 280) drops substantially to zero in the state of complete extinction, the output voltage Vo of the switching converter 210 is also very low. As a result, the supply voltage of the first current detection circuit 216 is insufficient, the detection signal VCSi linked to the fire current ILamp cannot be generated, and the switching converter 210 cannot be controlled.
    A second current detection unit 214 is provided separately from the first current detection unit 212 and is configured to generate a second detection signal VCS2 indicating the fire current Ilamp in the state of complete extinction where the first current detection unit 212 cannot operate. It can be said that the second current detection unit 214 indirectly monitors the fire current Ilamp by monitoring a current or a voltage linked to the fire current Ilamp- The second current detection unit 214 can be, for example, a current d input of the switching converter 210, a coil current flowing in a coil of the switching converter 210, a current flowing in a switching element of the switching converter 210, or equivalent.
    The converter control circuit 500A comprises a first control circuit 510, a second control circuit 520, a control circuit 530, and a determination circuit 540. The first control circuit 510 generates the first control pulse SCnti based on the first detection signal VCSi generated by the first current detection unit 212. The first control circuit 510 controls at least one of a duty cycle, a frequency, a running time, and a stopping time of the first control pulse SCNT1 so that the fire current Ilamp approaches the first quantity of target Irefi · In a case where the first current detection unit 212 is provided on an output side of the switching converter 210, as has been described with reference to FIG. 1, in the state of complete extinction of the light source 300, the supply voltage of the first unit current detection 212 is insufficient, the correlation between the first detection signal VCSi and the fire current Ilamp is destroyed, so that the first control circuit 510 cannot operate.
    In the complete extinction state, the second control circuit 520 generates a second control pulse SCnt2 so that the fire current Ilamp approaches the second quantity of current Iref2 · The second control circuit 520 can preferably generate the second control pulse SCnt2 by feedback. More specifically, the second control circuit 520 controls at least one of a duty cycle, a frequency, a run time, and a stop time of the second control pulse SCnt2 based on the second detection signal VCS2 generated by the second current detection unit 214 so that the fire current Ilamp approaches the second target quantity Iref2 · The configurations of the first control circuit 510 and of the second circuit 520 and the pulse generation method are not particularly limited. For example, architectures of the voltage mode, peak current mode, and medium current mode control circuits can be adopted, and ripple control architectures (hysteresis control, low detection configuration and on time, high detection configuration and off time) can also be adopted. Furthermore, in a case of control of the light source 300 by the bypass method, since very rapid reactivity is necessary, the first control circuit 510 and the second control circuit 520 may preferably be control circuits ripple. Note that the second control circuit 520 can continue to operate for a period in which the first control circuit 510 operates normally.
    The Ilamp fire current in the lighting state defines the brightness of the light source 300, and the Ilamp fire current in the fully extinguished state does not affect the brightness of the light source 300. Consequently, the first control circuit 510 is configured to generate the first control pulse Scnti by a control method with relatively high precision and the second control circuit 520 is configured to generate the second control pulse SCNT2 through to a control process with relatively low precision.
    The control circuit 530 controls the switching converter 210 on the basis of the first control pulse SCnti and the second control pulse SCnt2 · The control circuit 530 can select one of the first control pulse SCnti and the second control pulse SCnt2 to generate a gate control signal SGATE. As a variant, the control circuit 530 can also combine the first control pulse SCnti and the second control pulse SCNT2 to generate the door control signal SGATE.
    An example of configuration of a converter control circuit 500A will then be described. The first control circuit 510 includes a hysteresis control control circuit. More specifically, an upper threshold Iupperi and a lower threshold Ibottomi are defined near the first quantity of target Irefi · The first control circuit 510 shifts the first control pulse SCnti to an OFF level (for example a low level) when the first detection signal VCSi reaches a Vupperi voltage corresponding to the upper threshold Iupperi, and shifts the first control pulse SCnti to an ON level (for example a high level) when the first detection signal VCSX drops to a voltage VB0TT0Mi corresponding to the lower threshold Ibottomi - On an input side of the switching converter 210, the second current detection unit 214 is provided for monitoring an input current IIN of the switching converter 210 and for generating a second detection signal VCS2 in function of the fire current Ilamp · During a period when the switching transistor Mi is switched on, the co uring input IIN corresponds to an output current Ilamp · During a period when the switching transistor Mx is switched off, the second detection signal VCS2 has no correlation with the fire current Ilamp · By example, the second current detection unit 214 comprises a second detection resistor RS2 provided on a passage of the input current IIN, and a second current detection circuit 218 intended to convert a voltage drop of the second detection resistance Rs2 into a second detection signal VCS2. Furthermore, a resistor in the on state of the switching transistor Μχ can be used to replace the second detection resistance RS2- The supply voltage of the second current detection circuit 218 can be an input voltage VIN of the lighting circuit 200A or an internal voltage obtained by stabilizing the input voltage VIN. Consequently, it is possible to maintain the operation of the second current detection circuit 218 even in the state of complete extinction.
    The second control circuit 520 may be a circuit for controlling the upper detection mode and STOP time. More specifically, the second control circuit 520 defines an upper threshold Iopper2 based on the second quantity of target SCNT2 · The second control circuit 520 shifts the second control pulse Scnt2 to an OFF level (for example a low level) when the second detection signal VCS2 reaches a voltage Vopper2 corresponding to the upper threshold Iopper2- In addition, the second control pulse SCNT2 is shifted to an ON level (for example a high level) when a certain OFF time T0FF has elapsed . The OFF time T0FF can be constant or adjustable. Depending on the upper detection and OFF time configuration method, since current information during the period when the switching transistor Mx is off is not necessary, the second control pulse SCnt2 can be generated on the basis of the second detection signal VCS2.
    In the hysteresis control mode, an upper limit and a lower limit of the Ilamp fire current are defined, while only an upper limit of the Ilamp fire current is controlled in the upper detection configuration mode and break time. Consequently, it can be said that the current control accuracy of the first control circuit 510 is higher than that of the second control circuit 520.
    The determination circuit 540 determines whether the light source is in the complete extinction state, and confirms the determination signal DET to activate the second control circuit 520 if the light source is in the d state. complete extinction.
    Figure 5 is a diagram showing an example of a specific configuration of the converter control circuit 500A. The first control circuit 510 includes a hysteresis comparator. The hysteresis comparator comprises, for example, a variable voltage source 512 and a comparator 514. The variable voltage source 512 delivers one of the voltages VOTPERi and VB0TT0M1 according to a state of the output (first control pulse SCNTi) of the comparator 514. The comparator 514 compares the first detection signal VCSi to the output of the variable voltage source 512 and generates a first control pulse SCnti · The second control circuit 520 comprises a comparator 522 and a generator d pulse 524. The comparator 522 compares the second detection signal VCS2 to the voltage VÜPPER2 corresponding to the upper threshold Iüpper2 and generates an STOP signal SOff which is validated (for example a high level) when the second detection signal VCS2 reaches the voltage V0PPER2. The pulse generator 524 shifts to the STOP level in response to the validation of the STOP signal, and then generates a second control pulse SCnt2 shifted to the ON level. Pulse generator 524 includes a flip-flop 526 and an OFF time timer 528. The STOP signal Soff is entered in a reset terminal of flip-flop 526. The OFF time timer 528 validates a signal ON ON Once the STOP time TOff has elapsed since the second command pulse SCnt2 is shifted to the STOP level. The ON signal of sound is entered in a terminal for adjusting the flip-flop 526. Furthermore, the configuration of flip-flop 526 is not limited to that shown in FIG. 5.
    The determination circuit 540 may comprise a comparator 542 intended to compare a voltage corresponding to the voltage across the light source 300 (charging voltage VL) with a predetermined threshold voltage VTH. The determination circuit 540 can compare the output voltage Vo of the switching converter 210 with the threshold voltage VTH. The determination signal DET generated by the comparator 542 is validated (high level) in the complete extinction state and is inverted (low level) in the lighting state. By setting the threshold voltage VTH to be smaller than the forward voltage VF of the light emitting elements 302, it is possible to detect the complete extinction state on the basis of Vo <VF. Furthermore, comparator 542 can also be used as a short-circuit detection circuit.
    In a case where the second control circuit 520 is a control circuit of the upper detection configuration mode and OFF time, the second control circuit 520 can operate as an overcurrent protection circuit instead of '' be completely stopped during a period during which the first control circuit 510 can operate. In this case, the second upper threshold Iupper2 can be replaced by a first value ITHi and a second value ITH2. More specifically, the upper threshold IOpper2 of the second control circuit 520 can be set to the first value ITHi corresponding to the second quantity of target Iree2 in a state where the first control circuit 510 cannot operate. Likewise, the upper threshold VDPPER2 can be established at the second value ITH2 corresponding to an overcurrent threshold IOcp higher than the first quantity of target Irefi in a state where the first control circuit 510 can operate.
    More specifically, when the DET determination signal is validated, a voltage generated by a voltage source 523 can establish a first level VREF2 corresponding to the second quantity of target IREF2, and when the DET determination signal is inverted, the voltage generated by the voltage source 523 can establish a second level VOcp corresponding to the overcurrent threshold IOcp · FIG. 6 is a diagram intended to illustrate an operation of the second control circuit 520. In a state where at least one of the light emitting elements 302 is on (called ignition state), the DET determination signal is inverted. Before a time t0, the first control circuit 510 operates normally and the switching transistor Μχ is controlled according to the first control pulse SCnti generated by the first control circuit 510, so that the fire current Ilamp is stabilized in a range of Iupperi and Ibottomi corresponding to the first quantity of target Irefi · When the first control circuit 510 operates normally, the second control circuit 520 does not affect the control of the switching transistor Μχ.
    Before the time to, the value of the upper threshold Iopper2 of the second control circuit 520 is the second value ITh2 corresponding to an overcurrent threshold IOcp2-We assume that an anomaly occurs on the first control circuit 510 at time to- In the abnormal state, the value of the upper threshold IDpper2 of the second control circuit 520 decreases to the first value ΙΤΗχ defining the second quantity of target Iref2- [0072] At time tx, the STOP signal S0FF is validated in the second control circuit 520. Then, the ON sound signal is validated at time t2 after the STOP time T0FF has elapsed, the second control pulse SCNt2 and the gate control signal SGATE are at ON level, so that that the switching transistor Μχ is turned on. When the switching transistor Μχ is turned on, the input current IIN increases and the second detection signal VCS2 increases. In addition, when Iin> Iocp is satisfied, in other words, when VCS2> VOcp is satisfied, the STOP signal SOff is enabled in the second control circuit 520, the second control pulse SCnt2 is shifted towards the level OFF and the gate control signal SGATE is at the OFF level, so that the switching transistor Μχ is switched off. In addition, at a time t4 after the STOP time T0FF has elapsed, the ON signal S0N is validated, and the second control pulse SCNt2 is shifted to the ON level.
    Next, an embodiment in which the function similar to the lighting circuit 200A in FIG. 4 is implemented using an integrated circuit (IC) for controlling a light-emitting diode. Here, for example, the LM3409 circuit from TEXAS INSTRUMENTS INC. from the United States will be described as an example of the integrated light emitting diode control circuit.
    Figure 7 is a simplified block diagram of an integrated control circuit 600. It can be appreciated that the integrated control circuit 600 integrates the control circuit 530, the second control circuit 520, and the second detection circuit current 218 of figure 4.
    The integrated control circuit 600 includes a control circuit for the upper detection process and STOP time configuration. In the present embodiment, the control circuit incorporated in the integrated control circuit 600 is used as the second control circuit 520 (and overcurrent protection circuit) of FIG. 4.
    A PGATE terminal of the integrated control circuit 600 is connected to a gate of the switching transistor Μχ. A current setting terminal (IADJ) is configured to establish an IÜPPER peak current used in the upper detection and OFF time configuration process. A terminal CSP and a terminal CSN for current detection are connected to the second detection resistor Rs2. A voltage VCS2 proportional to the input current IIN is generated between the terminal CSP and the terminal CSN.
    A level shift circuit 610 includes resistors R21 and R22, and a V / I conversion circuit 612. The V / I conversion circuit 612 generates a current IADJ proportional to a voltage VIADJ entered in the terminal IADJ. A voltage drop IADJ χ R21 corresponding to the upper threshold Iupper2 is generated on the resistor R2i, and a voltage VCSP - IADJ χ R2i is generated on one end of the resistor R2x at a low potential. A voltage drop of the resistor R22 is substantially zero. The level shift circuit 610 corresponds to the second current detection circuit 218 and to the voltage source 523 in FIG. 5.
    The comparator 614 corresponds to the comparator 522 of FIG. 5. The comparator 614 compares a voltage on one end of the resistor R2i with a voltage on one end of the resistor R22 and generates an OFF signal Soff · It is that is, comparator 614 compares VCSP - IADJ χ R2i to VCSP - Rs2 χ Iin. This is equivalent to a comparison between IADJ χ R2i and Rs2 x IIN. The STOP signal Soff is validated if IIN> IADJ χ R2i / Rs2 is satisfied.
    The IADJ terminal of the integrated control circuit 600 is a configuration pin for establishing the upper threshold Iupper2 (and Iocp) · A voltage VIADJ which has a level corresponding to I0CP when the first control circuit 510 can operate, and has a level corresponding to Iupper2 when the first control circuit 510 cannot function is entered in the terminal IADJ.
    A capacitor for establishing the STOP time is attached to the outside on a COff terminal. A GND terminal is grounded. The input voltage VIN is supplied to a terminal VIN.
    The pulse generator 616 comprises a logic circuit 620 and an OFF time timer circuit 622. When the output SOff of the comparator 614 is validated, the logic circuit 620 shifts the second control pulse SCNT2 to the level OFF and issues a start trigger for the OFF time timer circuit 622. The logic circuit 620 is equivalent to flip-flop 526 in Figure 5, and the OFF time timer circuit 622 is equivalent to the timer STOP time 528 in figure 5.
    The OFF time timer circuit 622 begins to operate in response to the start trigger, and validates an ON signal SOn after the STOP time has elapsed- For example, the time timer circuit STOP 622 includes but is not limited to a switch provided in parallel with the capacitor Ctm which is fixed externally between the terminal Coff and the ground, and a comparator which compares the voltage Vcoff on the terminal COFF to a predetermined voltage V0FF. Similarly, a charging voltage Vc is applied to the COFF terminal via a resistor Rtm- When VCoff> VOff is satisfied, the switch of the OFF time timer circuit 622 is turned on and the capacitor Ctm is unloaded. It is possible to establish the STOP time as a function of a capacitance value of the capacitor Ctm, of a charging voltage Vc, and of a resistance value Rtm · The logic circuit 620 shifts the second control pulse SCNT2 to an ON level in response to the validation of the ON signal SOn- An output of the control circuit 530 is connected to the gate of the switching transistor Μχ via the PGATE terminal.
    The integrated control circuit 600 includes a validation terminal (EN) and is validated when a high level has entered the validation terminal. During a time when a low level has entered the validation terminal, the integrated control circuit 600 is disabled and the gate output PGATE is fixed at the low level, so that the switching transistor Μχ is switched off.
    Figure 8 is a circuit diagram of a lighting circuit 200B comprising the integrated control circuit 600 of Figure 7. The first control pulse SCNT1 generated by the first control circuit 510 is entered in the terminal validation of the integrated pilot circuit 600. That is to say that the complete integrated pilot circuit 600 is switched on / off as a function of the first control pulse SCNT1, and a gate control signal SGATE corresponding to the first control pulse SCnti is thus generated on the PGATE terminal. When all the lights are off, the validation terminal EN is fixed at the high level, and a door control signal SGATE corresponding to the second control pulse SCnt2 generated inside the integrated control circuit 600 is generated on the terminal PGATE.
    The determination circuit 540 compares the charging voltage VL delivered to the light source 300 with the threshold voltage VTH, and generates a determination signal DET. If the determination signal DET indicates ignition state, a first voltage level is delivered to the terminal IADJ, and a higher current inside the integrated control circuit 600 is thus established at I0Cp and the overcurrent protection function is activated. If the determination signal DET indicates a state of complete extinction, a second voltage level is delivered to the terminal IADJ, and the higher current inside the integrated control circuit 600 is thus established at IDpper2 and the second pulse of SCnt2 command is generated according to the upper detection configuration mode and downtime. That is, the second control circuit 520 is activated. Furthermore, a filter 270 intended to suppress ripples can be inserted between the switching converter 210 and the light source 300.
    The lighting circuit 200 can be mounted on vehicle lights 100 of different types, and in particular preferably on a scanning type light. Figure 9 is a perspective view of a scanning type vehicle light. The vehicle light 100 of Figure 9 can select a plurality of light distribution modes based on the movement scenes.
    The vehicle light 100 mainly comprises a light source part 110, a scanning optical system 120, a projection optical system 130, and the lighting circuit 200 described above. The light source portion 110 includes a plurality of light emitting units 112. The light source portion 110 and the light emitting units 112 correspond to the light source 300 and the light emitting elements. light 302 of Figure 2. The plurality of light emitting units 112 is connected to the lighting circuit 200 (not shown) via a connector 114. The light emitting units 112 include semiconductor light sources such as light emitting diodes (LED) and laser diodes (LD). A light emitting unit 112 configures a minimum brightness and on / off control unit. A light emitting unit 112 may be a light emitting diode wafer (laser diode wafer), or may include a plurality of light emitting diode wafers (laser diode wafers) connected in series and / or in parallel.
    The scanning optical system 120 receives light Li emitted by the light source part 110 and repeats a predetermined periodic movement, so that reflected light L2 from the scanning optical system 120 scans a front area of the vehicle in a transverse direction (a direction H in the figure). The projection optical system 130 projects the reflected light L2 from the scanning optical system 120 onto a virtual screen 10 on a front side of the vehicle. The projection optical system 130 may include a reflection optical system, a transmission optical system, or a combination thereof.
    More specifically, the scanning optical system 120 comprises a reflector 122 and a motor 124. The reflector 122 is fixed on a rotor of the motor 124 and performs a rotational movement. In the present embodiment, two reflectors 122 are provided, and the emitted light L2 scans twice per rotation of the motor 124. Therefore, a scanning frequency is twice the speed of rotation of the motor. Furthermore, the number of reflectors 122 is not particularly limited.
    At a certain time t0, the light Li emitted by the light source part 110 is reflected with an angle corresponding to a position of the reflector 122 (an angle of rotation of the rotor), the light reflected L2 at this time- there forms an irradiation zone 12 on the virtual screen 10 on a front side of the vehicle. For simplification of the description, the irradiation zone 12 is represented in FIG. 9 as being rectangular, but the irradiation zone 12 is not limited to a rectangular shape, which will be described later.
    At another time ti, when the position of the reflector 122 changes, a reflection angle changes, and the reflected light L2 'at this time forms an irradiation zone 12'. In addition, at another time t2, when the position of the reflector 122 changes, the angle of reflection changes, and the reflected light L2 '' then forms an irradiation zone 12 ''.
    The irradiation zone 12 performs a scan on the virtual screen 10 by rotating the scanning optical system 120 at a high speed, and light distribution configurations are therefore formed on a front side of the vehicle.
    Figures 10A to 10D are diagrams intended to illustrate the formation of light distribution configurations. Fig. 10A shows an arrangement of the plurality of light emitting units 112 in the light source portion 110. In the present embodiment, the number of units of the plurality of light emitting units 112 is new.
    The plurality of light emission units 112 is arranged in two or more stages in the height direction and three stages in this example, and the number of light emission units 112 on the stage the the lower is the larger. It is therefore possible to form an area with strong illumination near a line H on the virtual screen.
    The vehicle light 100 according to the present embodiment forms the light distribution configurations by superimposing a light distribution based on a scanning and a light distribution based on an absence of scanning. In addition to the plurality of light emitting units 112_1 to 112_9 for scanning, the light source portion 110 includes at least one of the light emitting units 113__1 and 113_2 for widely irradiating a front area of the vehicle d 'a way without scanning. Light emitted by the light emitting units 113_1 and 113_2 is irradiated on the virtual screen 10 via an optical system (not shown) different from the scanning optical system 120.
    FIG. 10B is a diagram showing an irradiation point formed by the light emitted by the light emitting units 112, 113 on the virtual screen 10 when the reflector 122 is in a predetermined position.
    The irradiation point formed by the light emission units 112 intended to scan is called focal point Sc. Soi represents a focal point formed by an i th lighting unit 112_i (1 <i 9) - A combination of a plurality of focal points Sel to Sc9 in FIG. 10B corresponds to an irradiation zone 12 in FIG. 9.
    The irradiation point formed by the light emission units 113 for diffusion on the virtual screen 10 is called the Sd diffusion point. Sdi represents a scattering point formed by an i th lighting unit 113_i. The scattering point Sd is independent of the rotation of the reflector 122. A combination of the scattering points Sdi and Sd2 is called the scattering zone 14.
    FIG. 10B only shows the irradiation points Sc on the basis of the right light. In a case where the right light and the left light are symmetrical, irradiation points of the left light are formed by inverting from left to right the irradiation points of Figure 10B along a line V.
    FIG. 10C shows areas SR (called scanning areas) through which each focused point Sc passes when the reflector 122 is rotated. SRi represents an area through which an i th focal point Sci passes. A combination of the scanning zones SRi to SR9, that is to say the zones where the irradiation zone 12 scans, is called the focused zone 15. The focused zone 15 overlaps the diffusion zone 14.
    FIG. 10D displays an illumination distribution in a horizontal direction of the light distribution configuration in the vicinity of the line H which is formed by the light emitting units 112_1 to 112_5 on the lowest floor .
    The actual light distribution configuration is a superposition of a light distribution configuration of the right light and a light distribution configuration of the left light. In this example, the focused area 15 of the left light substantially overlaps the focused region 15 of the right light. The diffusion zone 14 of the right light is mainly on a right side of the line V and the diffusion zone 14 (not shown) of the left light is mainly on a left side of the line V. Thus, the plurality of The light emitting units 112_1 to 112_9 for scanning are arranged so that the emitted light irradiates different parts on the virtual screen. The plurality of light emitting units 112 can be arranged in a U-shape as shown in Figure 10A. It is possible to align left and right ends of the focused areas of the light emitting units 112 at the first, second and third stages by arranging the plurality of light emitting units 112 in a U-shape ( or a form of E in Figure 10B). The correspondence between the plurality of light emission units 112 and channels is, for example, as follows: a first channel CHi = the light emission units 112_1 and 112_2; a second channel CH2 = the light emission unit 112__3; a third channel CH3 = the light emission units 112_4 and 122_5; a fourth channel CH4 = the light emission units 112_6 and 122_7; a fifth channel CH5 = the light emission units 112_8 and 122_9; and the light emitting units 113_1 and 113_2 for the scattering area are a sixth channel CHe.
    The plurality of light emitting units 112 is arranged in three stages in the height direction, and the light emitting units 112 irradiating the same height are arranged in the same channel so as to deliver the same amount of control current to light emitting units 112 in the same channel. The plurality of light emitting units 112 included in the same channel is connected in series so as to form a light source 300. The lighting circuit 200 is provided in each channel for switching on the light emitting units included in a corresponding channel.
    In a scanning type fire, a complete extinction state where a plurality of light emitting units 112 in the same channel is extinguished at the same time may occur intermittently in a scanning period. Consequently, it is possible to reduce the energy consumption with the control of the lighting circuit described above 200.
    The present invention has been described on the basis of the embodiment. It will be appreciated by those skilled in the art that this embodiment is merely an example, that various modifications may be made to the combination of the configuration elements and processing methods, and that these modifications are also within the scope of the present invention. Such modifications will be described below.
    (First modification)
    The switching on / off of the plurality of light emitting elements 302 is controlled by the bypass control circuit 290. Therefore, the bypass control circuit 290 controls when the complete extinguishing state occurs . The determination circuit 540 can determine whether the light source is in a complete extinction state or in an ignition state based on the information of the bypass control circuit 290. The first modification is represented by a line mixed in FIG. 2. As a variant, the function of the determination circuit 540 can be implemented on the bypass control circuit 290.
    [0110] (Second modification)
    In the embodiment, although the switching converter 210 is a step-down converter, the switching converter 210 can also be a step-up converter or a step-down converter.
    (Third modification)
    In the embodiment, the second converter control circuit 520 generates the second control pulse SCnt2 based on the detection signal VCS2 from the second current detection unit 214. The present invention is not limited to this. . The second control circuit 520 can generate the second control pulse SCnt2 in a completely open loop. In this case, although the level at which the fire current Ilamp is stabilized depends on the input voltage, the second control circuit 520 can be simplified. For example, the second control circuit 520 may include an oscillator.
    [0112] Although the present invention has been described with specific words and expressions based on the embodiments, the embodiments simply show an aspect of the principle and application of the present invention, and various changes in configuration and modifications can be made to the embodiments without departing from the scope of the claims.
    权利要求:
    Claims (6)
    [1" id="c-fr-0001]
    1. Lighting circuit (200) configured to control a light source (300) comprising a plurality of light emitting elements (302-1 to 302_N) connected in series, the lighting circuit (200) being characterized in that it comprises: a plurality of bypass switches (SWBi to SWBN) respectively connected in parallel to the light emitting elements (302-1 to 302_N); a switching converter (210); and a converter control circuit (500) configured to (i) stabilize a current of fire generated by the switching converter (210) at a first target amount in an ignition state where at least one of the plurality of light emitting elements (302-1 to 302_N) is on, and for (ii) stabilize the fire current at a second quantity of target smaller than the first quantity of target in a state of complete extinction where all the elements of the plurality of light emitting elements (302-1 to 302_N) are turned off.
    [2" id="c-fr-0002]
    The lighting circuit (200) according to claim 1, wherein the converter control circuit (500) comprises: a first control circuit (510) configured to generate a first control pulse (SCNTi) in the state ignition; a second control circuit (520) configured to generate a second control pulse (SCNT2) in the state of complete extinction; and a control circuit (530) configured to control the switching converter (210) according to the first control pulse (SCNIj) and the second control pulse (SCNT2), the current control accuracy of the first control circuit control (510) is higher than that of the second control circuit (520).
    [3" id="c-fr-0003]
    3. The lighting circuit (200) according to claim 1 or 2, further comprising: a determination circuit (540) configured to compare a voltage across the light source (300) with a threshold voltage and to determine that the light source (300) is in the complete extinction state if the voltage across the light source (300) is less than the threshold voltage.
    [4" id="c-fr-0004]
    The lighting circuit (200) according to claim 1 or 2, further comprising: a bypass control circuit (290) configured to control the plurality of bypass switches (SWBi to SWBN); and a determination circuit (540) configured to detect the complete extinction state based on a control signal from the bypass control circuit (290).
    [5" id="c-fr-0005]
    5. Vehicle light (100) characterized in that it comprises: a light source (300) comprising a plurality of light emitting elements (302-1 to 302_N) connected in series; and the lighting circuit (200) according to any of claims 1 to 3 which is configured to switch on the light source (300).
    [6" id="c-fr-0006]
    The vehicle light (100) of claim 5, further comprising: a scanning optical system (120) configured to receive light emitted from the light source (300) and to scan a front area of a vehicle .
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    同族专利:
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    CN108966409B|2020-07-14|
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    法律状态:
    2020-03-27| PLFP| Fee payment|Year of fee payment: 3 |
    2020-09-25| PLSC| Publication of the preliminary search report|Effective date: 20200925 |
    2021-03-25| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2017104923A|JP6916668B2|2017-05-26|2017-05-26|Lighting circuit for vehicle lighting equipment and light source|
    JP2017104923|2017-05-26|
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