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    • 专利摘要:
    An illumination circuit (300) includes a control unit (302) that selects one of an extinction mode and a plurality of illumination modes based on a first control signal and a a second control signal, and an actuating unit (310). The control unit (302) is configured to i) select the extinction mode when at least one of the first control signal and the second control signal is a pulseless signal, and ii) select a mode of the plurality of illumination modes based on the combination of the duty ratio of the first control signal and the duty ratio of the second control signal, when the first control signal and the second control signal are pulse signals.
    公开号:FR3062272A1
    申请号:FR1850438
    申请日:2018-01-19
    公开日:2018-07-27
    发明作者:Tomoyuki Ichikawa
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    Holder (s):
    ICHIKAWA TOMOYUKI.
    KOITO MANUFACTURING CO., LTD ..
    O Extension request (s):
    © Agent (s): CABINET BEAU DE LOMENIE.
    p4) LIGHTING CIRCUIT AND VEHICLE LIGHTING DEVICE.
    FR 3,062,272 - A1 (57) a lighting circuit (300) comprises a control unit (302) which selects one of an extinction mode and a plurality of lighting modes on the basis a first control signal and a second control signal, and an actuation unit (310). The control unit (302) is configured to i) select the shutdown mode when at least one of the first control signal and the second control signal is a pulseless signal, and ii) select a mode from the plurality of lighting modes based on the combination of the duty cycle of the first control signal and the duty cycle of the second control signal, when the first control signal and the second control signal are pulse signals.

    The invention relates to a lighting circuit and a vehicle lighting device.
    In recent years, a high brightness semiconductor light source such as a laser diode or a light emitting diode has been used in a vehicle lighting device. Using a high brightness light source, it is possible to form a light distribution configuration allowing visibility and safety to be improved.
    Figure IA and Figure IB are diagrams showing examples of light distribution configuration for which high light sources are used. By using a beam having a high directional capacity, such as for example a laser, it is possible to illuminate a distant local area 700. When traveling at high speed, an area
    lighting distant 700 East lit in more than one area lighting 702 for a fire of crossing and of a zoned lighting 7 04 for a fire of road, and he East so
    possible to increase visibility (called long range high beam or additional high beam).
    FIG. 1B is a diagram showing another example of a light distribution configuration for which a high-light source is used. Using the bright light source, it is possible to plot 712 graphical information, such as numbers or characters, on a road surface 710, at a higher illumination than that in the lighting area. 702 for the dipped beam (road surface marking). The graphical information 712 can inform a driver of the position of a pedestrian 720 for the sake of warning, or can inform the pedestrian 720 of the approach of a vehicle. As a variant, the graphic information 712 can draw a line along which the vehicle is to move, or can indicate a direction of movement at an intersection or a junction based on navigation information, The inventor studied vehicle lighting devices with high functions, and it follows that he found the following problems.
    It is assumed, for example, that a vehicle lighting device can switch among a plurality of modes such as the additional high beam in Figure IA and the road surface marking in Figure IB. In this case, it is necessary to provide information indicating lighting or extinction and information indicating a mode to a lighting circuit of the light source. In addition, when an operational state is changed in each mode, it is necessary to provide information indicating an operational state.
    In general, as control signals for the lighting circuit, signals with two values (for example HIGH and LOW) are used. When the number of lighting modes or operational states that are supported is increased due to the improved function of the vehicle lighting device, there is a problem that the number of control signals increases and for this reason the number of threads increases.
    In addition, such a vehicle lighting device must still have additional security and reliability due to the use of a light source with high brightness. For example, when a laser or optical system is defective, it is necessary to safely turn off the laser. It is assumed that a control signal is prepared for each mode and that HIGH and LOW are assigned to ON and OFF respectively. When a control line for transmitting a control signal corresponding to a certain mode is short-circuited with a power supply, there is a problem that the laser cannot be turned off.
    The invention provides a lighting circuit which can increase a safety function and which can switch among a plurality of lighting modes thanks to a small number of control signals.
    A lighting circuit for controlling a light source unit which is used in a vehicle lighting device according to a first aspect of the invention comprises: a control unit configured to receive a first control signal and a second control signal via two control lines and selecting one of an extinguishing mode and a plurality of lighting modes based on the first control signal and the second control signal; and an actuation unit configured to actuate the light source unit according to the mode selected by the control unit. The control unit is configured to i) select the shutdown mode when at least one of the first control signal and the second control signal is a pulseless signal, and ii) select a mode from the plurality of modes. illumination based on a combination of a duty cycle of the first control signal and a duty cycle of the second control signal, when the first control signal and the second control signal are both impulse.
    Depending on the aspect, it is possible to select a plurality of modes using the two control lines, regardless of the number of lighting modes. In addition, since the vehicle lighting device is switched off when at least one of the first control signal and the second control signal is a pulseless signal, it is possible to increase the safety against a fault. earth, a short circuit with a power supply and other anomalies.
    In the above aspect, the control unit can be configured to select a first lighting mode when the duty cycle of the first control signal is within a first range, and select a second mode of illumination when the duty cycle of the first second range signal. In this case, duty cycle of the second command (an operational lighting.
    In actuator light, between the lighting. position of or change the orientation of an optical axis.
    or the command is included in a it is possible to use the command signal, for a command to establish an equivalent parameter) other than the configuration mode command above, the source unit can include a source of and the state of the actuator can first lighting mode and the
    The actuator can be used a mask which blocks a light part and a different being second mode to change the of a beam, In the above configuration, in the second lighting mode, the light source can be on when the duty cycle of the second control signal is within a first range, and the light source can be turned off when the duty cycle of the second control signal is within a second range. In the second lighting mode, it is possible to flash the light source by changing the duty cycle of the second control signal between the first range and the second range alternately.
    In the above configuration, in the first lighting mode, the actuation unit can be configured to gradually turn on or off the light source, and the actuation unit can be configured to turn off instantly the light source when the duty cycle of the first control signal is within a third range adjacent to the first range. It is thus possible to instantly switch off the light source, without gradually switching off the light source.
    In the above configuration, the plurality of lighting modes can include a third lighting mode, and the control unit can be configured to select the third lighting mode when the duty cycle of the first signal of command is included in a fourth range.
    In the case where the first lighting mode and the second lighting mode are authorized only when the vehicle speed is equal to or greater than a predetermined value, there is the problem that it is not possible switch on the light source while the vehicle is stopped in the interest of maintenance or equivalent. In this case, the maintenance can be carried out by preparing the third lighting mode.
    The actuation unit can be configured to turn on the light source in the third lighting mode, at a lower speed than in the first lighting mode. There is a response time in the detection of an anomaly in the light source. In the third lighting mode, by reducing the rate of increase in the brightness of the light source, it is possible to reduce the amount of increase in brightness during the response time, and therefore, in the case of the anomaly, it is possible to turn off the light source from a lower brightness.
    In the above aspect, the actuation unit may include a switching converter which delivers a drive current to the light source of the light source unit and a protection switch which is provided on a drive current path, and the control unit can be configured to change a drive current control value and turn off the light source when the first control signal is a pulseless signal, and cut the protection switch when the second control signal is a pulseless signal.
    A vehicle lighting device according to a second aspect of the invention comprises a light source unit which comprises a light source, and the lighting circuit of the first aspect, the lighting circuit driving the light source unit.
    An arbitrary combination of the constituent elements described above or an aspect in which the constituent elements or expressions of the invention are mutually replaced among a method, an apparatus and a system is relevant as an aspect of the invention.
    Furthermore, secondary combinations of the characteristics described can be included in the invention.
    According to one aspect of the invention, it is possible to provide a lighting circuit which can increase a safety function and which can switch among a plurality of lighting modes thanks to a small number of control signals.
    The characteristics, advantages, and technical and industrial importance of embodiments of the invention will be described below with reference to the appended drawings, in which identical references denote identical elements, and in which:
    FIG. 1A is a diagram showing an example of a light distribution configuration for which a high light source is used;
    FIG. 1B is a diagram showing an example of a light distribution configuration for which a high brightness light source is used;
    Figure 2 is a block diagram of a lighting system according to one embodiment;
    Figure 3 is a sectional drawing showing an example configuration of a light source unit;
    Figure 4 is a diagram showing a correspondence relationship of a first control signal, a second control signal and a plurality of modes or functions;
    Figure 5A is an operational waveform diagram in a first lighting mode of a vehicle lighting device in Figure 2;
    Figure 5B is an operational waveform diagram in the first lighting mode of the vehicle lighting device in Figure 2;
    The figure 6A is a diagram operational of form wave in a second mode lighting of lighting device vehicle in the Figure 2; The figure 6B is a diagram operational of form • wave in the second mode lighting of lighting device e of vehicle in the Figure 2; and Figure 7 East a block diagram showing a
    example of configuration of a control unit.
    The invention will be described below on the basis of a preferred embodiment, with reference to the drawings. Identical references are assigned to component parts, identical or equivalent elements and methods shown in the drawings, and repetitive descriptions are appropriately omitted. The embodiment is an example, and does not limit the invention, and not all of the features described in the embodiment and combinations thereof are essential subjects of the invention.
    In this element A is connected to an element A and the description element, a "state where element B" includes a case B are physically linked where directly, are connected and as well as a case where element A and element B indirectly via another element which has no substantial influence on the state of electrical connection of element A and element B or which does not not affect functions and effects to be exerted by the coupling of element A and element B.
    Similarly, a "state where an element C is provided between an element A and an element B" includes a case where the element A or the element B and the element C are directly connected, thus that a case where element A or element B and element C are connected indirectly via another element which has no substantial influence on the state of electrical connection of the element A or element B and element C or which does not affect the functions and effects to be exerted by the coupling of element A or element B and element C.
    In the present description, references assigned to electrical signals such as voltage signals and current signals and circuit elements such as resistors and capacitors, as required, indicate voltage values, current values, resistance values and capacitance values.
    In the present description, ordinates and abscissas of the waveform diagrams and referenced time diagrams are enlarged or reduced as appropriate, to facilitate understanding, and drawn waveforms are simplified, exaggerated or underlined, to facilitate understanding.
    Figure 2 is a block diagram of a lighting system according to one embodiment. A lighting system 1 comprises a battery 2, an electronic control unit on the vehicle side 4 and a vehicle lighting device 10. The vehicle lighting device 10 provides an additional high beam function and a lighting function. road surface marking which are shown in Figure IA and Figure 1B. In FIG. 2, only functional blocks linked to the functions are shown, and functional blocks linked to a low beam and a high beam are omitted.
    The vehicle lighting device 10 comprises an electronic lighting device control unit 100, a light source unit 200 and a lighting circuit 300. The electronic lighting device control unit 100 mainly comprises a switch 102 and a control device 104. The control device 104 is connected to the electronic control unit on the vehicle side 4 via a network 6 such as a network of control device ( CAN) or a local interconnection network (LIN). The controller 104, which is a central processing unit, a microcontroller or the like, receives an instruction for switching off the lighting, vehicle speed information, camera information and the like from the unit vehicle side electronic control unit 4, and controls the switch 102 and a light source unit 200 based on the received signals.
    The switch 102 is provided on a supply passage of a source voltage (battery voltage Vbat) from a battery 2 to the lighting circuit 300. When the control device 104 receives an ON command from the electronic control unit on the vehicle side 4, the control device 104 activates the switch 102.
    The light source unit 200 comprises a light source 202, a cooling fan 204, an actuator 206, a slot 208, a temperature detection element 210, and an anomaly detection circuit. light emission 212. The light source 202 is a semiconductor light source such as a laser diode or a light emitting diode. The cooling fan 204 cools the light source 202 by air. The temperature detection element 210 is a thermistor, a thermocouple or the like, and detects the temperature of the light source 202.
    As described above, the electronic lighting device control unit 100 supports a plurality of lighting modes. In the embodiment, the lighting mode can be switched depending on the state of the actuator 206. For example, the actuator 206 is equipped with the slot 208, and switching among the plurality of modes lighting can be produced as a function of the position of the slot 208. As a variant, the position or the inclination of the light source 202, of a lens, of a mirror or the equivalent of an optical system not illustrated can be controlled by the actuator 206, and switching among the plurality of lighting modes can thus be achieved.
    The light emission anomaly detection circuit 212 detects an anomaly of the light source 202. For example, the light source 202 can be constituted by a blue laser and a white light source comprising a substance fluorescent. Light emitted by the blue laser enters the fluorescent substance, and is synthesized with yellow light generated by the fluorescent substance, so that white light is generated. Blue laser light is normally dispersed by the fluorescent substance, but there is a problem that the raw blue laser light is not dispersed and is emitted without any change (what is called light leakage anomaly), due to the deviation of the fluorescent substance from an optical axis of the blue laser or an influence of degradation of aging, so that blue laser light dazzles peripheral persons. The light emission anomaly detection circuit 212 can monitor the light leakage anomaly. In addition, the light emission anomaly detection circuit 212 can detect an anomaly of an optical axis of the light source 202, and the like.
    The lighting circuit control 300 comprises a unit
    302 and an actuation unit 310. The control unit
    302 controls the actuation unit 310 on the basis of signals from the command control device Sigl, Sig2 coming from
    104. The control unit 302 delivers to the control device 104 a diagnostic signal DIAG indicating a diagnostic result (if there is an anomaly) for the light source unit 200 or the lighting circuit 300.
    The actuation unit 310 comprises a switching converter 312, a fan control device 314, an electromagnet drive circuit 316, and a protection switch 318. The switching converter 312 has an output constant current, and generates an actuating current I 0ÜT stabilized at a target current Iref ^ to deliver the actuating current I 00T to the light source 202. The fan control device 314 actuates the cooling fan
    204. For example, the actuator 206 is an electromagnet actuator, and the electromagnet actuation circuit (actuator actuation circuit) 316 actuates the actuator 206. The protection switch 318 is provided on a passage of the actuating current I 0DT , and is stopped when the anomaly is detected.
    Figure 3 is a sectional drawing showing an example configuration of the light source unit 200. A mirror 220 and a lens 222 reflect and condense the light emitted by the light source 202, to regulate the scattering angle of the light emitted, the optical axis and the like. The slot 208 is provided between the mirror 220 and the lens 222. The actuator 206 changes the position of the slot 208, between positions designated by the references 208A, 208B in FIG. 3. For example, when the actuator 206 is in an unactivated state, the position of the slot 208 is position 208A. At this time, light reflected from the mirror 220 passes through the slot 208, and a light distribution pattern suitable for road surface marking is thereby formed. When electric current is supplied to the electromagnet of the actuator 206 (an activated state), the position of the slot 208 is changed to position 208B, and the slot 208 does not act on the light, so that a light distribution for the long-range high beam is formed.
    Referring again to Figure 2. An interface between the control unit 302 and the control device 104 will then be described. The control unit 302 receives a first control signal Sigl and a second control signal Sig2 via two control lines 12, 14, and selects one of an extinction mode and a plurality of modes lighting on the basis of the first control signal Sigl and the second control signal Sig2. The actuation unit 310 actuates the light source unit 200 according to the mode selected by the control unit 302.
    It is thus possible to select a plurality of modes via the two control lines 12, 14, regardless of the number of lighting modes.
    The control unit 302 selects the extinction mode, when at least one of the first control signal Sigl and the second control signal Sig2 is a signal without pulse. In the extinction mode, the target current I RE f of the switching converter 312 is fixed at zero, and the actuating current I O ut becomes zero. In the extinguishing mode, the protection switch 318 can be switched off.
    In the case where a pulse signal cannot be transmitted because the electrical potential of at least one of the control lines 12, 14 is fixed, for example due to a ground fault or a short circuit with the power supply to the control lines 12, 14 or an anomaly in an output interface of the control device 104, it is guaranteed to necessarily select the extinction mode, and it is therefore possible switching off the light source 202 and increasing a safety function.
    When the first control signal Sigl and the second control signal Sig2 are both pulse signals, the control unit 302 selects a mode from the plurality of lighting modes, based on the combination the duty cycle of the first control signal Sigl and the duty cycle of the second control signal Sig2. Frequencies of the first control signal Sigl and the second control signal Sig2 can be constant, and can be around 200 Hz, for example.
    The control unit 302 selects a first lighting mode MODE1 when the duty cycle of the first control signal Sigl is included in a first range (40 to 80% for example), and selects a second lighting mode MODE2 when the duty cycle of the first Sigl control signal is within a second range (20 to 40% for example).
    In the case where the state of the actuator 206 is changed according to the lighting mode, the control unit 302 gives the electromagnet actuation circuit 316 different commands depending on the mode.
    As an example, the first lighting mode is a remote lighting mode described with reference to FIG. IA, and the second lighting mode is a road surface marking mode described with reference to the figure IB. This case will be described in the following.
    The duty cycle of the second control signal Sig2 can be used to control a different parameter of lighting mode. For example, in the second lighting mode, the control unit 302 can deliver the actuating current Ι ουτ to the light source 202, to switch on the light source 202, when the duty cycle of the second control signal Sig2 is contained in a first range (0 to 20% for example), and can adjust the actuating current I 00T to zero, to switch off the light source 202, when the duty cycle of the second control signal Sig2 is included in a second range (80 to 100% for example). In the first lighting mode, the duty cycle of the second control signal Sig2 can be masked.
    In other words, in the second lighting mode (road surface marking mode), it is possible to make the light source 202 blink by modifying the duty cycle of the second control signal. Sig2 between the first range and the second range alternately.
    In the first lighting mode, the actuation unit 310 can gradually turn on or off the light source 202. More specifically, when the actuation unit 310 receives a lighting command, the actuator 310 gently increases the actuating current I 0UT over time and slowly increases the brightness. On the contrary, when the actuation unit 310 receives an extinction command, the actuation unit 310 gently decreases the drive current I O ut over time and gently decreases the brightness. It is possible to produce a high quality feeling using the change in the brightness of the light source 202.
    Furthermore, the actuation unit 310 can instantly turn off the light source 202, when the duty cycle of the first Sigl control signal is within a third range (80 to 100% for example) adjacent to the first beach. In the first lighting mode (distant lighting mode), to prevent the beam from dazzling previous vehicles and approaching vehicles, when a previous vehicle is detected, it is necessary to immediately switch off the source of light 202 instead of gradually switching off the light source 202. A partial range of the duty cycle of the first Sigl control signal is therefore assigned for instantaneous extinction, and it is thus possible to further increase the safety.
    Furthermore, a third MODE3 lighting mode can be added, and the third MODE3 lighting mode can be selected when the duty cycle of the first Sigl control signal is in a fourth range (0 to 20% for example ).
    The light source 202, due to the fact that it has a high brightness, strongly dazzles peripheral persons, by emitting light during the stopping of the vehicle (or during a movement at low speed). Therefore, the controller 104 is designed to monitor the vehicle speed and to select the first lighting mode (distant lighting mode) or second lighting mode (road surface marking mode) only when the vehicle speed is equal to or greater than a predetermined value. In this case, there is a problem that it is not possible to turn on the light source 202 while the vehicle is stopped in the interest of maintenance or the like. The third lighting mode (also called maintenance mode) MODE3 in which the light source 202 can be switched on even while the vehicle is stopped can therefore be prepared. Maintenance can thus be carried out.
    As described above, in the first mode of lighting MODE1, the actuation unit 310 gradually turns on the light source 202. In the third mode of lighting MODE3, the unit of actuation 310 can turn on the light source 202 at a speed slower than [0054] It
    The anomaly in the first lighting mode MODE1.
    there is a response time in the detection of the light source 202 for detecting an emission anomaly by the light circuit 212.
    of
    By reducing the light rate,:
    response increase, and therefore possible from a lower brightness. Figure 4 is a correspondence diagram of the first source signal for increasing the is possible to reduce the amount of brightness during the anomaly, to turn off the brightness of the source the time from is by light to showing a Sigl command relationship, from
    second control signal Sig2, and the plurality of modes or functions.
    Figure 5A and Figure 5B are operational waveform diagrams in the first lighting mode of the vehicle lighting device in Figure 2. Reference is made to Figure 5A. Before time t0, the light source 202 is switched off. When the first control signal Sigl having a duty cycle of 50% and the second control signal Sig2 having a duty cycle of 50% are delivered at time t0, the control unit 302 determines that the mode is the first mode of MODE1 lighting. At this time, the second control signal Sig2 need only be pulse-free, and need not have a duty cycle of 80 to 100%. The switching converter 312 increases the actuating current I O üt at a first rate (for example, a time constant of 0.8 seconds). The light source 202 is thus slowly turned on (gradually turned on), a rapid change in brightness is suppressed, the driver and peripheral persons are prevented from being dazzled, and a feeling of high quality is produced.
    When at least one of the first control signal Sigl and the second control signal Sig2 is changed to without pulse at time ti, the control unit 302 determines that the mode is the extinction mode, and decreases the current actuation I O ut at the first rate to gradually turn off the light source 202.
    Referring to Figure 5B. Before a time t2, the light source unit 200 is turned on in the first lighting mode. When a vehicle is detected at the front at time t 2 , the duty cycle of the first Sigl control signal is changed to 90%. In this way, the control unit 302 adjusts the actuating current
    Everything from the switching converter 312 to zero in a shorter time than It is thus possible light 202, and to prevent the vehicle to that in the progressive extinction, to immediately extinguish the source of the front to be dazzled.
    are the the second vehicle mode diagrams in the
    Before to, the source FIG. 6A and FIG. 6B operational of the waveform in lighting of the lighting device in FIG. 2. Reference is made to FIG. 6A.
    of light 202 is off. When the first control signal Sigl having a duty cycle of 25% and the second control signal Sig2 having a duty cycle of 90% are delivered at time to, the unit determines that the mode is
    The second mode converter
    MODE2.
    actuating current I 0ÜT first second). The rate turned on, and controls 302 at a higher rate (for example a light source constant 202 is thus switching lighting 312
    increases the high that the time to 0.8 at once
    is appropriate graphical information plotted on a road surface.
    When at least one of the first and second pulse control signals at time ti, the unit the mode is the extinction mode.
    actuation I 0DT is signal of
    Sig2 is command command
    Sigl changed to
    302 determines without the first rate, immediately extinguished.
    We refer to the source unit of
    The current then decreased at a higher rate and the light source 202 in Figure 6B. Before a light time 200 is switched on in is ta, the second mode of lighting. After time t 2 , the duty cycle of the second control signal Sig2 is changed between two values of 90% and 10%, with a predetermined flashing period (for example 0.3 seconds). It is thus possible to make the light source 202 flash.
    To flash the light source, it is conceivable that a pulse for the flashing control is generated using an oscillator of the vehicle lighting device. However, in this method, a light source of a right lighting device and a light source of a left lighting device are caused to flash asynchronously. As described above, by superimposing control information for flashing on the second control signal Sig2, it is possible to synchronize the flashing operations of the right and left lighting devices.
    Figure 7 is a block diagram showing an example configuration of the control unit 302. The first input amplifier 350 and the second input amplifier 352 receive the first control signal Sigl and the second signal Sig2 command, respectively. A first pulse detector 354 determines whether the first control signal Sigl is a pulse signal or a signal without pulse, and generates a first determination signal S 3 i which has a first level (for example HIGH) in the case of 'a pulse signal which has a second level (BAS) in the case of a signal without pulse. That is, the first pulse detector 354 determines whether edges of the first Sigl control signal are entered with a predetermined period (for example 200 Hz).
    A light control circuit 370 generates a signal V ss which specifies the target value Ire F of the actuating current I O ut of the switching converter 312. An output amplifier 380 generates the target value Ire F of the current d actuation I 0ÜT according to the VSS signal.
    The light control circuit 370, which includes a progressive ignition-extinction circuit, gently increases the signal V ss at the start of the lighting and gently decreases the signal V ss at the time of extinction, in the first lighting mode. For example, the light control circuit 370 may include a capacitor 372, a charge circuit 374 and a discharge circuit 376. The charge circuit 374 and the discharge circuit 37 6 are shown as symbols for light sources. current, but components of the charging circuit 374 and the discharge circuit 37 6 are not limited, and may be resistors or switches.
    When the first determination signal S 3 ia the BAS level, the first determination signal S31 is delivered to at least one block of the control unit 302, so that the target current Ire F becomes zero. For example, the first determination signal S31 can be supplied to the light control circuit 370, and the light control circuit 370 can adjust the signal V ss to zero when the first determination signal S31 has the LOW level.
    A second pulse detector 356 determines whether the second control signal Sig2 is a pulse signal or a signal without pulse, and generates a determination signal S 32 indicating the determination result. The determination signal S 32 is used for the control of the protection switch 318 in FIG. 2. When the second control signal Sig2 is a pulse signal, the determination signal S 32 has the HIGH level, and the protection switch 318 is started. When the second control signal Sig2 is a pulseless signal, the determination signal S 32 is at the LOW level, the protection switch 318 is stopped, and the extinction mode is selected.
    For example, the pulse detectors 354, 356 can be constituted by monostable multivibrators which can be triggered several times, but the invention is not limited to this.
    A smoothing circuit 358 is a low-pass filter which smoothes the first Sigl control signal, and generates a detection voltage V DUT yi corresponding to the duty cycle of the first Sigl control signal. The smoothing circuit 358, which is configured to be switched on or off according to the first determination signal S31, generates the detection voltage V DUTY i when the first determination signal S31 has the HIGH level, and adjusts the voltage of detection V DUTY i at zero when the first determination signal S31 has the LOW level.
    The first comparator COMF1 to the third comparator COMP3 compare the detection voltage V DUT yi to thresholds V 80 %, V 40 %, V 20 %, and determine whether the duty cycle of the first control signal Sigl is included in a range from 0 to 20%, a range from 20 to 40%, a range from 40 to 80% or a range from 80 to 100%. An output S41 of the first comparator COMF1 has the HIGH level in the case of Vdutyi> V 80 %. An output S 42 of the second comparator COMP2 has the HIGH level in the case of V DUTY i> V 40 %. The third comparator COMP3 has an inverse logic, and an output S 48 of the third comparator COMP3 has the HIGH level in the case of Vdqtyi <V 2 o% · In the following, an operation of the control unit 302 will be described for each range of the duty cycle of the first Sigl control signal.
    0% <Duty 20% (Third lighting mode). In this case, the output signal S 48 of the third comparator COMP3 has the HIGH level. The signal S 43 acts on the charging circuit 374 of the light control circuit 370, and decreases an amount of charging current for the capacitor 372. The rate of increase of the voltage V ss thus decreases.
    20% <Duty 40% (Second lighting mode). The two output signals S42, S43 of the second comparator
    COMP2, of the third comparator COMP3 have the LOW level. When the two signals S42, S43 have the LOW level, a logic gate 364 activates the first switch 362. Logic gate 364 can be a NOR gate.
    A filter 360 smooths an output of the second input amplifier 352. An output of the filter 360 acts on an input of the amplifier 380 via a resistor R 6 i. When the duty cycle of the second control signal Sig2 is a certain value of 80% or more, an output of the filter 360 has the HIGH level. In this state, the output of the filter 360 does not influence the input of the amplifier 380, and the target value I RE f depends on the output V ss of the light control circuit 370.
    When the duty cycle of the second control signal Sig2 is a certain value of 20% or less, the output of the filter 360 has the LOW level. Since R 6 i <R62 is satisfied, as the input voltage of the amplifier 380, the output of the filter 360 having the level BAS takes precedence over the output signal V ss of the light control circuit 37 0. This results that the target value Iref, which is the output of amplifier 380, becomes zero, and the light source 202 is turned off.
    When the duty cycle of the second control signal Sig2 is changed between Dutyl (<20%) and Duty2 (> 80%) with a predetermined period, the output of the filter 360 changes and returns between the LOW level and the HIGH level . As a result, it is possible to flash the light source 202.
    40% <Duty 80% (First lighting mode). The output S42 of the second comparator COMP2 has the HIGH level. The electromagnet actuation circuit 316 is thus activated, and the actuator 206 is powered, resulting in the first lighting mode.
    80% <Duty (Instant extinction). The output S41 of the first comparator COMP1 has the HIGH level. The second switch 378 is thus turned on, and the output V ss of the light control circuit 370 immediately becomes zero, so that the light source 202 is turned off.
    Those skilled in the art understand that the configuration of the control unit 302 is not limited to that of FIG. 7 and that there are different possible modifications. For example, the control unit 302 can be configured as a digital circuit, or the same function can be performed by software control.
    The invention has been described above, on the basis of embodiment. Those skilled in the art understand that the embodiment is an example, that various modifications can be made as combinations of the components and methods, and that these modifications are included within the scope of the invention. These modifications will be described below.
    The combination of a plurality of lighting modes is not limited to the combination described in the embodiment. When there is a plurality of lighting modes in a light source unit for a low beam and an ordinary high beam, the technology described above can be applied to the control of the light source unit .
    The invention has been described using specific words and phrases, based on the embodiment. The embodiment simply shows an application of the invention. In the form of numerous layout changes and to be made without departing from the principle and one of embodiments, modifications may be made to the scope of the invention.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    1. Lighting circuit intended to control a light source unit which is used in a vehicle lighting device, the lighting circuit being characterized in that it comprises:
    a control unit (302) configured to receive a first control signal and a second control signal via two control lines (12, 14) and select one of an extinction mode and a a plurality of lighting modes based on the first control signal and the second control signal; and an actuation unit (310) configured to actuate the light source unit (200) according to the mode selected by the control unit (302), the control unit (302) being configured to
    i) selecting the off mode when at least one of the first control signal and the second control signal is a pulseless signal, and ii) selecting a mode from the plurality of lighting modes based on a combination a duty cycle of the first control signal and a duty cycle of the second control signal, when the first control signal and the second control signal are both pulse signals.
    [2" id="c-fr-0002]
    2. The lighting circuit as claimed in claim 1, in which the control unit (302) is configured to select a first lighting mode when the duty cycle of the first control signal is within a first range, and to select a second lighting mode when the duty cycle of the first control signal is within a second range.
    [3" id="c-fr-0003]
    3. Lighting circuit according to claim 2, in which:
    the light source unit (200) includes a light source (202) and an actuator (206); and an actuator state (206) is different between the first lighting mode and the second lighting mode.
    [4" id="c-fr-0004]
    4. The lighting circuit as claimed in claim 2 or 3, in which, in the second lighting mode, the light source (202) is switched on when the duty cycle of the second control signal is within a first range, and the light source (202) is turned off when the duty cycle of the second control signal is within a second range.
    [5" id="c-fr-0005]
    5. Lighting circuit according to claim 4, in which:
    in the first lighting mode, the actuation unit (310) is configured to gradually turn on or off the light source (202); and the actuation unit (310) is configured to instantly turn off the light source (202) when the duty cycle of the first control signal is within a third range adjacent to the first range.
    [6" id="c-fr-0006]
    6. Lighting circuit according to claim 5, in which:
    the plurality of lighting modes includes a third lighting mode;
    the control unit (302) is configured to select the third lighting mode when the duty cycle of the first control signal is within a fourth range; and the actuating unit (310) is configured to turn on the light source (202) in the third lighting mode at a slower speed than in the first lighting mode.
    [7" id="c-fr-0007]
    7. Lighting circuit according to any one of claims 1 to 6, in which:
    the actuation unit (310) comprises a switching converter (312) configured to supply an actuating current to the light source (202) of the light source unit (200) and a protection switch ( 318) which is provided on a passage of the actuating current; and the control unit (302) is configured to change a control value of the actuating current and turn off the light source (202) when the first control signal is a pulseless signal, and turn off the protection switch ( 318) when the second control signal is a pulseless signal.
    [8" id="c-fr-0008]
    8. Vehicle lighting device characterized in that it comprises:
    a light source unit (200) which includes a light source (202); and the lighting circuit (300) according to any one of claims 1 to 7, the lighting circuit (300) driving the light source unit (200).
    1/7
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    同族专利:
    公开号 | 公开日
    JP6782176B2|2020-11-11|
    CN108340829B|2021-04-02|
    JP2018118556A|2018-08-02|
    US10072809B2|2018-09-11|
    US20180209605A1|2018-07-26|
    DE102018200872A1|2018-07-26|
    CN108340829A|2018-07-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP4931720B2|2007-07-26|2012-05-16|株式会社小糸製作所|Lighting control device for vehicle lamp|
    JP4776596B2|2007-08-01|2011-09-21|株式会社小糸製作所|Lighting control device for vehicle lamp|
    JP5436318B2|2010-04-26|2014-03-05|株式会社小糸製作所|Vehicle headlamp and vehicle headlamp system|
    WO2012111574A1|2011-02-16|2012-08-23|本田技研工業株式会社|Vehicle led lighting device|
    JP6077864B2|2013-01-21|2017-02-08|株式会社小糸製作所|DC-DC converter, vehicle lamp|
    KR101637882B1|2014-08-07|2016-07-08|엘지전자 주식회사|Apparatus for driving headlamp of vehicle and vehicle including the same|
    US9907151B2|2014-09-16|2018-02-27|Koito Manufacturing Co., Ltd.|Lighting circuit and vehicle lamp having the same|
    ES2687320T3|2014-10-24|2018-10-24|Automotive Lighting Italia S.P.A.|Method to control a motor vehicle lighting device using LEDs|
    JP6691348B2|2014-11-27|2020-04-28|株式会社小糸製作所|Lighting circuit and lighting system|
    AT516965B1|2015-03-25|2016-12-15|Zkw Group Gmbh|Lighting device for vehicle headlights|JP6988467B2|2017-12-27|2022-01-05|株式会社デンソー|Vehicle front lighting device, disconnection detection method|
    JP2020055351A|2018-09-28|2020-04-09|株式会社小糸製作所|Head lamps for vehicle|
    法律状态:
    2019-12-16| PLFP| Fee payment|Year of fee payment: 3 |
    2020-12-10| PLFP| Fee payment|Year of fee payment: 4 |
    2021-12-17| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2017009768A|JP6782176B2|2017-01-23|2017-01-23|Lighting circuit and vehicle lighting|
    JP2017009768|2017-01-23|
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