• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A lighting circuit (2) is configured to supply a driving current to a first light source (3) and a second light source (4). The lighting circuit (2) has a conversion unit (31) which receives a first voltage for the first light source and a second voltage for the second light source via a common input terminal ( 31a), performs a voltage conversion on the first voltage or the second voltage, and outputs the control current, a control unit (32) which controls the current value of the control current outputted by the conversion unit. (31), a first switch (39tn) which selects whether to supply the driving current to the first light source (3) by means of a first signal based on the first voltage, a signal generation unit ( 33) which receives the first voltage and the second voltage and generates a second signal, and a second switch (39dr) which selects whether to supply the driving current to the second light source (4) by means of the second signal.
    公开号:FR3034949A1
    申请号:FR1653025
    申请日:2016-04-06
    公开日:2016-10-14
    发明作者:Kotaro Matsui；Takao Sugiyama
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD [0001] Aspects of the present invention relate to a lighting circuit, and in particular to light emission control technology of two light sources configured to perform different functions. BACKGROUND [0002] JP-A-2013-60151 discloses a vehicle lamp unit having a high beam light, a low beam light, a day light (DRL), a flashing light and a clearance light (CLL). The DRL is turned on to allow a pedestrian or driver of an opposite vehicle to recognize a vehicle traveling during the day. The CLL is mounted on the front of a vehicle to indicate the width of the vehicle and the existence of the vehicle. The flashing light is configured to flash to inform drivers of vehicles in front and behind of a vehicle's change of direction and route. For example, in a flashing light and a DRL of the associated technique, to light at the same time a light source for the DRL (hereinafter referred to as "DRL source") and a light source for the flashing light (Hereinafter referred to as a "flashing light source"), the DRL source and the flashing light source are arranged so that their light-emitting surfaces are spaced to a certain extent. When the DRL source and the flashing light source are to be arranged so that their light emitting surfaces are close to each other, the DRL and the flashing light are lit at the same time, making the light flashing light intensity above normal, so as to comply with the regulations in force. It is necessary to provide a DC / DC converter and a control circuit for each of the DRL and the flashing light so that the DRL and the flashing light can be lit at the same time. Considering here the case where the light emitting surfaces of the flashing light and the DRL were used in common, where were arranged closely within the limits of a predetermined distance 3034 94 9 2, it was necessary to switch off the DRL during the flashing time period of the flashing light so as to maintain the visibility or the light emission color of the flashing light.
    [0002] SUMMARY The present invention has been realized in view of the above circumstances and one aspect of the present invention provides an effective configuration of a driver circuit for a plurality of light source units configured to perform different functions, for example For example, a flashing light and a DRL. According to an explanatory embodiment of the present invention, there is provided a lighting circuit configured to deliver a driving current to a first light source and to a second light source configured to perform a function different from 15. that of the first source of light. The lighting circuit comprises: a conversion unit configured to receive a first voltage for the first light source and a second voltage for the second light source through a common input terminal, to perform a conversion voltage on the first voltage or the second voltage, and for delivering the driving current from an output terminal; a control unit configured to control the current value of the control current output by the conversion unit; a first switch configured to select whether to deliver the driving current to the first light source by means of a first signal based on the first voltage; a signal generation unit configured to receive the first voltage and the second voltage and to generate a second signal; and a second switch configured to select whether to deliver the driving current to the second light source by means of the second signal.
    [0003] According to this configuration, it is possible to jointly use the conversion unit and the control unit for controlling the first light source and the second light source and to switch a steering target according to the a voltage supply state. The above lighting circuit may further include a third switch configured to, on the basis of the second voltage, interrupt the current flowing to the input terminal of the lightning unit. conversion during a period of time when the first voltage is delivered. Accordingly, during a period of time when the first voltage and the second voltage are delivered at the same time, it is possible to prevent a detection error because the vehicle-side system erroneously detects that the first light source is disconnected. when the input current of the first intermittent voltage becomes unstable due to the input current due to the second voltage. In the above lighting circuit, the signal generating unit may be configured to generate the second signal so that the second switch continues to select not to deliver the driving current to the second source. of light, even when the second voltage which is a DC voltage is delivered, during a period of time when the first voltage is supplied which is an intermittent voltage repeating a period of time at the high level and a period of time at the low level according to a predetermined cycle. That is, when the first intermittent voltage is delivered to the first light source and the second DC voltage is delivered at the same time to the second light source, the second signal is generated so that the first source of light preferably emits light. In the above lighting circuit, the signal generating unit may be configured to generate, as a second signal, a signal in which a predetermined time delay longer than the time period at which the signal is generated. Low level of the first voltage is applied to a waveform of the second voltage. That is, when the second voltage is delivered, the second signal having the time delay is applied to the waveform of the second voltage waveform. The second switch is thus actuated with the predetermined time delay from the start of supplying the second voltage so that the second light source is turned on to emit light. From a state where the first voltage and the second voltage are delivered at the same time and the first light source is in a flashing light emitting state based on the supply of the first voltage. intermittent, even when the supply of the first voltage is stopped to complete the blinking while the second voltage continues to be delivered, the second light source is not activated to emit light immediately due to the delay time. It is therefore possible to clarify the end of the flashing light emission. In the lighting circuit above, the control unit may be configured to control the conversion unit to output the driving current having a current value for the first light source at least during a period of time when the first switch selects the supply of the driving current to the first light source and for outputting the driving current having a current value for the second light source at least for a period of time in which the second switch selects the supply of the driving current to the second light source. Thus, even when the first and second light sources are driven by the common conversion unit, it is possible to deliver the appropriate driving current to each of the first light source and the second light source. The above lighting circuit may be used for a vehicle lamp device, the light emitting surface of the first light source and the light emitting surface of the second light source. may be arranged closely or used in common, the first light source may serve as a flashing light and the second light source may serve as a daytime running light (DRL). It is thus possible to implement the appropriate light emission operations of the flashing light and the DRL by means of the effective configuration of the control circuit. According to the above configuration, it is possible to effectively configure the driver circuit and implement the appropriate light emission control for the first light source and the second light source configured to perform different functions.
    [0004] BRIEF DESCRIPTION OF THE DRAWINGS The invention will be well understood and its advantages will be better understood on reading the detailed description which follows. The description refers to the following drawings, which are given by way of example. The above and other aspects of the present invention will become more apparent and will be more readily understood from the following description of illustrative embodiments of the present invention, taken in conjunction with the accompanying drawings, in which: Figs. 1A and 1B show examples of light emitting surfaces of a lamp according to an illustrative embodiment of the present invention; Fig. 2 is a circuit diagram of a vehicle lamp device including a lighting circuit according to an illustrative embodiment of the present invention; FIG. 3 represents the driving states of a flashing light source and a DRL source according to an explanatory embodiment of the present invention; FIG. 4 shows that a supply voltage of DRL is delivered during the supply of a flashing power supply voltage according to an illustrative embodiment of the present invention; FIG. 5 shows that the flashing supply voltage and the DRL supply voltage are delivered at the same time according to an explanatory embodiment of the present invention; FIGS. 6A and 6B show an interruption of the current path of a DRL supply when supplying the flashing power supply voltage according to an illustrative embodiment of the present invention; and Fig. 7 is a circuit diagram showing an example of a specific circuit of a conversion unit according to an explanatory embodiment of the present invention. DETAILED DESCRIPTION [0013] 1. First Embodiment 3034 94 9 6 A vehicle lamp device including a lighting circuit according to illustrative embodiments will be described hereinafter with reference to the accompanying drawings. The first explanatory embodiment is directed to a vehicle lamp device including a lighting circuit for a flashing light serving as a first light source and a DRL serving as a second light source. [0014] FIGS. 1A and 1B show examples of light emitting surfaces of a lamp 10 configured to emit light by means of the lighting circuit according to the first explanatory embodiment. The light emitting surface 11 of FIG. 1A is a light emitting surface of a flashing light and a light emitting surface of a DRL, such that the light emitting surface is shared.
    [0005] FIG. 1B shows an example where the light emitting surface of the flashing light and the light emitting surface 11d of the DRL are arranged closely. The near arrangement refers to that where the light emitting surfaces are arranged within a distance that is legally required to extinguish the DRL for a flashing period of the flashing light in a country where the present invention must be implemented. In the first illustrative embodiment, as shown in FIGS. 1A and 1B, for example, assume a configuration where the light emitting surfaces of the flashing light and the DRL are used in common or are arranged closely. FIG. 2 shows an exemplary configuration of a vehicle lamp device 1 including a lighting circuit 2 according to an explanatory embodiment. The vehicle lamp device 1 comprises the lighting circuit 2, a flashing light source 3 and a DRL source 4. The vehicle lamp device 1 is configured so that energy must be delivered to it by the battery (not shown) of a vehicle on which the vehicle lamp device 1 is mounted. In this case, a supply voltage (first voltage Vtn) for flashing light emission and a supply voltage (second voltage Vdr) for DRL light emission are delivered by the vehicle.
    [0006] In Figure 2, a change of direction switch 5 and a DRL switch 6 are shown. When the flashing light emission is requested, the direction change switch 5 is AL I NE by a signal S10, so that the first voltage Vtn is supplied to a terminal 21 of the lighting circuit 2. D On the other hand, when the DRL light emission is requested, the DRL switch 6 is ON by a signal S11, so that the second voltage Vdr is supplied to a terminal 22 of the lighting circuit 2. A terminal 23 is a ground terminal and is connected to the vehicle ground line 10. As a first voltage Vtn for the flashing light, as shown in FIG. 3, an intermittent voltage repeating a period of time at the high level Ti and a period of time at the low level T2 according to a predetermined cycle in a period of active time of 15 flashing Tton is used. For example, Ti = T2 = 350 ms. The Tton flashing active time period corresponds to a period of time when the driver of the vehicle requests (or signals danger) the flashing light emission for a right / left turn. That is, the first voltage Vtn is a supply voltage for flashing as a direction change signal. The voltage during the period of time at high level Ti is the voltage value of the positive terminal of the battery such as 12 V, 24 V or the like, and the voltage during the period of time at low level T2 is at the level of the mass (0 V), for example. As a result, for example, the battery voltage, which is periodically ON / OFF while the direction switch 5 is connected to the voltage line of the positive terminal of the battery and repeats the ON / OFF states at the same time. the signal S10 during the flashing active time period Tton can be used as the first voltage Vtn. Alternatively, the first voltage Vtn that becomes a periodic voltage during the flashing active time period Tton may be generated by a predetermined vehicle-side controller in place of the direction change switch 5 and 35 delivered to the vehicle lamp device 1 The second voltage Vdr for DRL has a predetermined DC voltage value (e.g., the voltage value of the battery) for a period of time when the DRL is turned on to emit light. Accordingly, when the DRL switch 6 is connected to the voltage line of the positive terminal of the battery and the DRL illumination is requested by the action of the driver or an electronic control unit (ECU) On the vehicle side, the DRL switch 6 becomes AU IF by means of the signal S11 and the battery voltage is applied to the input of the vehicle lamp device 1 as the second voltage Vdr. The second voltage Vdr may be supplied to the vehicle lamp device 1 by a predetermined vehicle-side controller as a replacement for the DRL switch 6, in response to a demand for DRL illumination by the driver or the ECU. In any case, when the first voltage Vtn and the second voltage Vdr are delivered by the vehicle by any method, the vehicle lamp device 1 activates the flashing light source 3 and the source of DRL 4 for emit light in response to the inputs of the first voltage Vtn and the second voltage Vdr. In the vehicle lamp device 1 of Fig. 2, the flashing light and the DRL are connected to the vehicle side only through the terminals 21, 22, 23. The first voltage Vtn is a supply voltage for transmission flashing light light and serves as a flashing light light emission instruction. The second voltage Vdr is a supply voltage for DRL light emission and serves as a DRL light emission instruction. That is, the signals of the flashing light emission request and the DRL light emission request are not output separately from the first voltage Vtn or the second voltage Vdr.
    [0007] As described later, the vehicle lamp device 1 according to the first explanatory embodiment implements the appropriate light emission control of the flashing light source 3 and the DRL source 4 by means of the FIG. simple connection with the vehicle, that is to say the three wire connections consisting of the line 35 at the first voltage Vtn, the line at the second voltage Vdr and the ground line. In the vehicle lamp device 1, the flashing light source 3 is configured by means of a plurality of 3L LEDs connected in series. In Figure 2, the three LEDs 3L are connected in series. The number of light-emitting diodes configuring the flashing light source 3 may be any number greater than or equal to 1. In the flashing light source 3, the anode side of the 3L LEDs connected in series is connected to a terminal 24 of the signal circuit. lighting 2 and the cathode side is connected to ground. The source of DRL 4 is configured by means of a plurality of 4L LEDs connected in series. In Figure 2, the three LEDs 4L are connected in series. The number of light-emitting diodes configuring the DRL source 4 may be any number greater than or equal to 1. The number of LEDs may be different from that of the flashing light source 3.
    [0008] In the DRL source 4, the anode side of the LEDs 4L connected in series is connected to a terminal 25 of the lighting circuit 2 and the cathode side is connected to ground. On the other hand, the flashing light source 3 and the DRL source 4 may have a configuration where one or more LEDs connected in series are connected in parallel. The lighting circuit 2 comprises a conversion unit 31, a control unit 32, a timer circuit 33, diodes 34, 35, an inverter 36, a switch 37, an OR gate 38, a flashing side switch 39tn and a DRL side switch 39dr. The terminal 21 to which the first voltage Vtn is to be delivered is connected to the input terminal 31a of the conversion unit 31 via the diode 34. The terminal 22 to which the voltage is to be delivered second voltage Vdr is connected to the input terminal 31a of the conversion unit 31 via the diode 35 and the switch 37. The terminal 21 is connected with the inverter 36 and the switch 37 The switch 37 is ON when the output of the inverter 36 is high: level H and is OFF when the output of the inverter 36 is turned ON or OFF by the output of the inverter 36. is low: level B. The conversion unit 31 is a DC / DC converter and is configured to perform a voltage conversion for an input voltage Vin between the input terminal 31a and a earth terminal 31c and to generate an output voltage Vout between the output terminal 31b and a bo mass rd 31d. That is, the conversion unit 31 is configured to set, as the input voltage Vin, the voltage of the battery as a first voltage Vtn or a second voltage Vdr, and to generate the voltage of output Vout, which is an LED driving voltage of the flashing light source 3 or the DRL source 4 using the input voltage Vin. Various configurations of the conversion unit 31 may be considered. For example, the conversion unit 31 may include a switching regulator or a serial regulator. In addition, an insulated type or a non-insulated type may be used. On the other hand, a boost converter, a step-down converter, or an up / down converter can be used as a DC / DC converter, although this depends on the relationship between the battery voltage and the direct drop voltage of the battery. the flashing light source 3 or the DRL source 4 and the situation at the battery voltage drop. The current based on the output voltage Vout appearing at the output terminal 31b of the conversion unit 31 flows from the terminal 24 to the flashing light source 3 via the flashing side switch 39tn. as control current Id. Id driving current flows from terminal 25 to the DRL source 4 via the DRL side switch 39dr. The control unit 32 is configured to control the current value of the driving current Id of the conversion unit 31. For example, the control unit 32 is configured by means of an integrated circuit (IC ). The control unit 32 and the conversion unit 31 can be configured in an integrated manner. The control unit 32 is configured to control the conversion unit 31 so that the driving current Id having a predetermined current value is delivered to the flashing light source 3 and the DRL source 4. Specifically the control unit 32 is configured to output a control signal S11 to the conversion unit 31 and to execute a current value command and a control current stabilization command Id based on on a detection signal S10 of the output current (driving current) of the conversion unit 31. For example, when the conversion unit 31 is a switching regulator, the control unit 32 generates, as a control signal S11, a pulse width modulated switching control signal (PWM or PWM) based on the current detection signal S10 and a predetermined reference signal (target value), so as to ex- Execute the current value command and the control current stabilization command Id. [0026] The control unit 32 is provided with an activation terminal 32a and is configured to control the operations of the control unit. conversion 31 as a function of the terminal voltage of the activation terminal 32a. The control unit 32 here controls the conversion unit 31 serving as a DC / DC converter when the terminal voltage of the activation terminal 32a is at the level H and interrupts the control of the conversion unit 31 serving as the DC / DC converter when the terminal voltage of the activation terminal 32a is at the level B. [0027] The control unit 32 is provided with a current value setting terminal 32b and is configured to control the value the current of the driving current Id from the conversion unit 31 as a function of the terminal voltage of the current value setting terminal 32b. It is assumed here that the value of the driving current Id is set as the current value Itu for a flashing light when the terminal voltage of the current value setting terminal 32b is at the level H and the value of the current of Id control is set as current value Idr for the DRL when the terminal voltage of the current value setting terminal 32b is at B. For example, to generate the PWM switching control signal, the The control unit 32 is configured to modify and set a target value, which must be compared with the current detection signal S10 to any of the flashing reference signal and the reference signal for DRL according to the terminal voltage of the current value setting terminal 32b, so as to switch the current value of the driving current Id to the current value Itu for flashing light / the current value Idr for DRL. On the other hand, the current value Itu for flashing light is lower than the current value Idr for 3034 94 9 12 DRL (Itu <Idr) for example. However, the current value Itu for flashing light may be greater than the current value Idr for DRL (Itu> Idr) or both may be identical (Itu = Idr). Terminal 32c is a ground terminal. As described above, the first voltage Vtn also serves as a control signal for the flashing light emission. The first voltage Vtn to be supplied to terminal 21 is input to OR gate 38 as signal St, is also inputted to current value setting terminal 32b and serves as the control signal. flashing side switch 39tn. The signal St (first voltage Vtn) serves as an initialization / reset control signal of the timer circuit 33. The second voltage Vdr also serves as a control signal for the light emission of DRL. The second voltage Vdr to be supplied to terminal 22 serves as signal Sd through timer circuit 33. Timer circuit 33 is configured to delay the waveform of second voltage Vdr by a delay time. Td (described later) by counting a predetermined time and setting it as a signal Sd. The count of the timer circuit 33 is reset for a period of time when the signal St (first voltage Vtn) is at the level H, and is initialized when the signal St goes to the level B. That is to say that the circuit timer 33 is configured to execute the ascending count for a period of time at level B of signal S.
    [0009] The signal Sd of the timer circuit 33 is input to the OR gate 38 and serves as the control signal of the DRL 39dr switch. The OR gate 38 is configured to provide the logical sum of the signals Sd, St at the activation terminal 32a of the control unit 32. [0031] For a period of time at the level H of the signal St, the flashing side switch 39tn is ALLEVED and is configured to output the driving current Id from the conversion unit 31 to the flashing light source 3, thereby allowing the flashing light source 3 to emit light. During a period of time at the level B of the signal St, the flashing side switch 39tn is OFF, so that the driving current Id is not delivered to the flashing light source 3 even though the conversion unit 31 is driving. During a period of time at the level H of the signal Sd, the DRL side switch 39dr is AU1VE and is configured to output the driving current Id from the conversion unit 31 to the source of DRL 4, so as to activate the source of DRL 4 to emit light. During a period of time at the level B of the signal Sd, the switch DRL 39dr side is OFF, so that the driving current Id is not delivered to the source of DRL 4, even if the conversion unit 31 is in train 10 to drive. The operation of the vehicle lamp device 1 is described. First, the case where the second DRL side voltage Vdr is output as the ACTIVE level (e.g., the voltage of the positive terminal of the battery) and the first flashing side voltage Vtn is OFF (for example, the ground level). ) is described. This corresponds to operation during a period of time ranging from times t0 to t2. In this case, the operation of the respective units is as follows. Since the first voltage Vtn is OFF, and the output of the inverter 36 is at the level H, the switch 37 is AL I1VE Thus, the second voltage Vdr delivered to the terminal 22 is delivered. at the input terminal 31a of the conversion unit 31. Since the signal St is at the level B, the flashing side switch 39tn is DISABLED.
    [0010] At time t0 in Fig. 3, the second voltage Vdr is ON. At this time, since the signal St is at level B, the timer circuit 33 executes the count and applies the delay time Td to the waveform of the second voltage Vdr to create the signal Sd. By means of the signal Sd, the activation terminal 32a becomes a voltage at the level H at time t1.
    [0011] On the other hand, by means of the signal Sd, the DRL side switch 39dr is ON from time t1. Consequently, after the instant t1, the conversion unit 31 is driven, the driving current Id is delivered to the source of DRL 4 and the source of DRL 4 is activated.
    [0012] At this time, since the current value setting terminal 32b is at level B, the control unit 32 controls the conversion unit 31 so that the current value of the driving current Id becomes the current value Idr for the DRL. Thus, the DRL source 4 emits the light having the brightness set for the DRL. The case where an intermittent supply voltage is applied as a first voltage Vtn for the flashing light is then described. In this case, even when the second voltage Vdr for the DRL is delivered, the source of DRL 4 is deactivated. During a period of time when the second voltage Vdr is not delivered, the DRL side switch 39dr is OFF and the DRL source 4 does not emit light. FIG. 3 shows the case where the period of time ranging from times t2 to t3 becomes the flashing active time period Tton and the first intermittent voltage Vtn is delivered while the second voltage Vdr remains ON. During the flashing active time period Tton, the first voltage Vtn repeats the time period at the high level Ti and the time period at the low level T2 according to a predetermined cycle. In the lighting circuit 2, the time period at the low level T2 of the first voltage Vtn can not be distinguished from the period of time of absence of power (time period with the exception of the period of time). active flashing time Ton). This is because a control signal with the exception of the first voltage Vtn is not inputted from the vehicle. When the flashing active time period Tton starts at time t2, since timer circuit 33 is reset during the time period at high level Ti, signal Sd goes to level B. As a result, the switch DRL 39dr side is OFF, so the source of DRL 4 is off. During the time period at high T1, the signal St is at the level H. Therefore, even when the signal Sd goes to the level B, the activation terminal 32a goes to the level H and the conversion unit 31 is driven. On the other hand, the flashing side switch 39tn is ON. Therefore, after time t2, during the period of high time T1, the conversion unit 31 is driven, the driving current Id is delivered to the flashing light source 3 and the flashing light source 3 is activated.
    [0013] At this time, since the current value setting terminal 32b is at the H level, the control unit 32 controls the conversion unit 31 so that the current value of the driving current Id becomes the same. current value Itu for flashing light. Thus, the flashing light source 3 emits light having the brightness set for the flashing light. During the period of time at the low level T2 of the first voltage Vtn, the activation terminal 32a goes to the level B, so that the conversion unit 31 stops. On the other hand, the flashing side switch 39tn is DESAL 1. [EV. As a result, the flashing light source 3 is deactivated. Accordingly, the high time period T1 and the low time period T2 are repeated, so that the flashing light source 3 flashes as a direction change signal. On the other hand, during the time period at the low level T2, since the output of the inverter 36 is at the level H and the switch 37 is ON, the second voltage Vdr is delivered to the conversion unit 31. during the corresponding period of time since the conversion unit 31 stops, the driving current Id is not outputted. During the time period at the low level T2, even when the second voltage Vdr is delivered, the activation terminal 32a is at the level B. This is due to the fact that the signal Sd is maintained at the level B during the period of time at low level T2, as described later. As a result, the DRL side switch 39dr is also maintained in the DESAL state. [0038] An operation that is performed when the flashing active time period Tton is complete at time t3 is then described.
    [0014] In FIG. 3, the supply of the first voltage Vtn is completed at time t3. At this time, even when the second voltage Vdr is delivered, the source of DRL 4 is not activated immediately. The last period of time at the high level T1 of the flashing active time period Tton is terminated at the instant t3 and the reset state of the timer circuit 33 is released, so that the signal Sd has the time delay. Td and goes to level H. As a result, at time t4, the activation terminal 32a goes to the H level and the DRL side switch 39dr is AL I1VE. Accordingly, after time t4, the conversion unit 31 is driven and the driving current Id is delivered to the DRL source 4, so that the DRL source 4 is activated. At this time, since the current value setting terminal 32b is at level B, the control unit 32 controls the conversion unit 31 so that the current value of the driving current Id becomes the current value Idr for DRL. Thus, when the time delay Td has elapsed after the flashing active Tton time period is over, the DRL source 4 resumes the light emission having the brightness for DRL. [0039] The preferred activation operation of the flashing light source 3 for emitting light during the Tton flashing active time period as described above is then described in detail with reference to FIGS. 4 and 5. In FIG. first explanatory embodiment, the appropriate light emission control is implemented by means of the setting of the delay time Td (generation of the signal Sd) by the timer circuit 33 and the initialization / reset command by means of 20 signal St of the timer circuit 33. [0040] In FIG. 4, the case where the supply of the second voltage Vdr for DRL starts during the flashing active time period Tton is described. FIG. 4 represents the first voltage Vtn (= signal St), the second voltage Vdr, the lighting state of the flashing light source 3, the lighting conditions of the source of DRL 4 (no delay and delay Td) and the signals Si, Sd, S2. As shown in FIG. 4, the flashing light source 3 flashes by means of the supply (time period Ti at the high level, time period T2 at the low level) of the first intermittent voltage 30 Vtn after the instant t10. It is now assumed that the supply of the second voltage Vdr starts at time t11 of the time period at low level T2. Here, "(no delay)" indicates the lighting state of the DRL source 4 when the delay time of the timer circuit 33 is zero. However, it is assumed that the initialization / reset of the timer circuit 33 by means of the signal St is executed.
    [0015] 3034 94 9 17 In the case (no delay) during the time period at the low level T2, since the switch DRL side 39dr was AL HIVE and the activation terminal 32a is passed to the level H by means of the waveform (H level) of the second voltage Vdr, the source of DRL 4 is activated. It is necessary to avoid the situation in which the DRL source 4 is activated in this way during the flashing active time period Tton, since the visibility of the flashing signal is degraded. Accordingly, in the first illustrative embodiment, as described above, the timer circuit 33 is configured to generate the signal Sd having the delay time Td and the initialization / reset of the timer circuit 33 is executed. As a result, even when the supply of the second voltage Vdr starts during the flashing active time period Tton, the signal Sd remains at the level B and the source of the DRL 4 remains in the off state as shown. by "(delay Td)" in Fig. 4. This is because even when the second voltage Vdr is delivered at time t11, signal Sd is not at level H until delay time Td has elapsed and the period of time at the high level T1 arrives before the delay time Td has elapsed, so that the timer circuit 33 is reset (arrow RS). The timer circuit 33 is continuously reset during the time period at the high level Ti. On the other hand, timer circuit 33 starts counting (arrow ST) at time t12 during the next time period at low level T2. However, before reaching the count of the delay time Td, the period of time at the high level T1 arrives at time t13, so that the account is reset. Consequently, the signal Sd remains at level B. [0043] FIG. 5 represents the same waveforms as FIG. 4. FIG. 5 represents the cases where the delay time Td is appropriate and is not appropriate. when the first voltage Vtn and the second voltage Vdr are delivered at the same time. With regard to the lighting state of the DRL source 4, 35 "(Td <T2)" indicates the case where the delay time Td due to the timer circuit 33 is shorter than the time period at the low level. T2 3034 94 9 18 and "(Td> T2)" indicates the case where the delay time Td is longer than the time period at the low level T2. If Td <T2, the signal Sd passes at the level H before the period of time at the low level T2 is completed. Since the DRL side switch 39dr is ON and the activation terminal 32a is at the H level, the DRL source 4 is then activated for a short time. On the other hand, when the setting of (Td> T2) is executed, the signal Sd is not at the level H during the time period at the low level T2, as shown in FIG. 5. Accordingly, the situation in which the source of DRL 4 is activated for a short time during the active time period of flashing Ton is avoided. According to the examples shown in Figures 4 and 5, it is understood that it is appropriate that the delay time Td due to the count of the timer circuit 33 is longer than the time period 15 at the low level T2 . In the first explanatory embodiment, the switch 37 is activated / deactivated by means of the output of the inverter 36. This is intended to prevent a detection error in case of abnormal determination of the flashing light source 3 vehicle side.
    [0016] In a recent vehicle-side system, it is determined whether a lamp device is normal or abnormal (disconnection) by means of the value of a current flowing in the vehicle lamp device. For example, as described above, the disconnection anomaly of the turn signal signal lamp is determined by detecting the value of the current flowing in the vehicle lamp device 1 when the vehicle side controller delivers the first voltage. Vtn to the vehicle lamp device 1. [0047] It is assumed here that the switch 37 is not provided, considering the case where the first voltage Vtn and the second voltage Vdr 30 are delivered at the same time. In this case, as shown in FIG. 6A, the flax current flows both from the first voltage side Vtn and the second voltage side Vdr. In this case, the current detection value by means of the first voltage Vtn is not constant, so that the vehicle-side controller can determine that the disconnection has occurred even if the flashing light source 3 is normally activated.
    [0017] In order to avoid this situation, the switch 37 is provided and is set to DESALED while the first voltage Vtn is being delivered, so that the flow of the current Tin from the second voltage side Vdr is turned off as shown in Figure 6B. That is, the current Tin is activated to flow only from the first voltage side Vtn upon ignition of the flashing light source 3, so that the vehicle-side detection error can be prevented. . 2. Second Explanatory Embodiment In the following, an example of a specific configuration of the conversion unit 31 according to a second explanatory embodiment is described with reference to FIG. 7. As described above, the conversion unit 31 can be configured in various ways. An example where a chopper-type converter is used as a conversion unit 31 is here described. In FIG. 7, the same configurations as those of FIG. 2 are represented with the same reference numbers and their descriptions are omitted. As shown in Fig. 7, the illumination circuit 2 comprises a control signal circuit 40 for the current value setting terminal 32b of the control unit 32 in addition to the conversion unit 31, control unit 32, the flashing side switch 39tn and the DRL side switch 39dr. the other units (not shown) (the timer circuit 33, the diode 34, 35, the inverter 36, the switch 37 and the OR gate 38) are arranged in the same manner as in FIG. 2. [0049] In the example of FIG. 7, the flashing light source 3 comprises ten 3L LEDs connected in series, and the DRL source 4 comprises four 4L LEDs connected in series. The conversion unit 31 is configured to convert an input voltage (first voltage Vtn, second voltage Vdr) between the input terminal 31a and the ground terminal 31c to generate an output voltage, and for supplying the driving current Id from the output terminal 31b to the flashing light source 3 or to the DRL source 4 based on the output voltage. The flashing side switch 39tn and the DRL side switch 39dr are turned on / off by the signals St, Sd, similarly to the configuration of FIG. 2. The conversion unit 31 serving as DC / DC converter comprises an induction element Li, a switch SW, a rectifying diode D1, resistors R1, R2, R3 and capacitors C1, C2, and is configured as an elevator / non-isolation switching regulator . As shown in FIG. 7, one end of the induction element Li is connected to the input terminal 31a (positive terminal of the supply voltage) and the other end of the induction element Li is connected to the anode of the rectifying diode D1. The switch SW is connected between the connection point of the induction element Li and the rectifying diode D1 and the resistor R2 and the other end of the resistor R2 is connected to ground (ground terminal 31c). . Switch SW is configured by means of a switching element such as a metal oxide semiconductor field effect transistor (MOSFET) or the like. The gate of the switch 15 SW receives a switch control signal Spwm from the terminal 32d of the control unit 32 via the resistor R3. The capacitor C1 is connected between the input terminal 31a and the ground terminal 31c. Since the capacitor C2 is configured to function as a smoothing capacitor, it is connected between the cathode side of the rectifying diode D1 and the ground terminal 31c. The resistor R1 is a resistor for the current detection and one end thereof is connected to the connection point of the cathode of the rectifying diode D1 and the capacitor C2 and the other end is connected to the output terminal 31b. The voltage between the two ends of the resistor R1 is applied at the input of the terminals 32e, 32f to the control unit 32 and the control unit 32 is configured to detect the current value of the driving current Id according to the tension between the two ends. The control unit 32 is configured as an IC (integrated circuit) for LED control, for example. The control unit 32 is configured to generate an error signal for a target constant current value based on the voltage between the two ends of the resistor R1, and to control a switch operation of the switch SW based on on the error signal, so that the current value of the driving current coincides with the target value.
    [0018] Thus, the constant current of the driving current Id is controlled. That is, the control unit 32 is configured to generate the switching control signal Spwm to control the ON / OFF operation (switch operation) of the switch SW so that the current value of the Id driving current coincides with the target value (current value Itu for the flashing light or current value Idr for the DRL). Specifically, the control unit 32 is configured to control the operation of the switch control signal Spwm, so as to execute the constant current command. Thus, the driving current Id having a predetermined current value based on the output voltage of the conversion unit 31 is activated to flow to the LEDs (3L or 4L) of the flashing light source 3 or the source DRL 4, so that the respective LEDs (3L or 4L) emit light. In this example, the cathode terminal of the LEDs 3L as a flashing light source 3 is connected to ground. On the other hand, the cathode terminal of the LEDs 4L as the DRL source 4 is connected to the terminal 31a (power supply line) via the terminal 31e.
    [0019] This is intended to create a cathode potential of the DRL source 4, given the configuration where the conversion unit 31 is configured as a DC / DC elevator type converter. When the summed value of the direct voltages of the respective LEDs 4L of the DRL source 4 is less than the input voltage (battery voltage) of the conversion unit 31, the conversion unit 31 can not control the driving current Id to drive the LEDs 4L, so that the excess current flows to the respective LEDs 4L. Accordingly, to control the drive current Id of the 4L LEDs to a desired value, the cathode potential is increased. In the control unit 32, the target value of the driving current Id is set by the terminal voltage (H / L) of the current value setting terminal 32b. In the example of FIG. 2, the signal St (first voltage Vtn) is inputted to the current value setting terminal 32b.
    [0020] In the example of FIG. 7, the terminal voltage of the current value setting terminal 32b is set by the adjustment signal circuit 40.
    [0021] In contrast to the example of FIG. 2, the control unit 32 sets the current value Idr for the DRL as the target value when the terminal voltage of the current value setting terminal 32b is at the H level and sets the current value Itu for the flashing signal lamp as a target value when the terminal voltage of the current value setting terminal 32b is at the B level. adjusting signal 40 has resistors R11 to R17, an N-channel FET, an NPN type bipolar transistor 42 and a capacitor C11. The voltage V1 is a predetermined voltage to be generated for example by the control unit 32. The resistors R11, R12 are connected between the voltage line V1 and the ground, and the resistor R13 and the TEC 41 are connected. in series between the voltage division point of the resistors R11, R12 and the ground.
    [0022] The capacitor C11 is connected between the current value setting terminal 32b and the ground, so as to suppress the noise. The voltage of the current value setting terminal 32b is set by the resistors R11, R12, R13 as a function of the PASSING / BLOCKING states of the TEC 41. The gate of the TEC 41 is connected to the connection point of the resistors R14, R15 and at the collector of the bipolar transistor 42. The resistors R14, R15 are connected between the voltage line V1 and the ground. The emitter of the bipolar transistor 42 is connected to ground and the base is connected to the terminal 40a via the resistor R16. The resistor R17 is connected between the base and the emitter of the bipolar transistor 42. The terminal 40a receives, for example, the signal Sd. During a period of time when the signal Sd is at the level H, that is to say the DRL side switch 39dr is AL I IVÉ, since the bipolar transistor 42 is PASSANT and the TEC 41 is BLOCKED, the voltage of the current value setting terminal 32b is at the level H. In this case, the control unit 32 sets the current value Idr for DRL as the target value of the driving current Id. The period of time when the signal Sd is at level B, i.e. where the DRL side switch 39dr is OFF has a time period when the flashing side switch 39tn is ON. However, in this case, since the Bipolar Transistor 42 is BLOCKED and the TEC 41 is PASSING, the voltage of the current value setting terminal 32b is at B. Thus, the control unit 32 sets the current value Itu for the flashing light as the target value of the driving current Id. 5 [0058] 3. Overview As described with the first and second explanatory embodiments, the lighting circuit 2 is a lighting circuit for the first light source (flashing light source 3) and the second light source (DRL source 4) configured to perform the light-emitting function different from that of the first light source. The lighting circuit 2 comprises the conversion unit 31, the control unit 32, the first switch (flashing side switch 39tn), the signal generation unit (timer circuit 33) and the second switch (side switch DRL 39dr).
    [0023] The conversion unit 31 of the lighting circuit 2 is configured to receive the first voltage (Vtn) for the first light source and the second voltage (Vdr) for the second light source via the terminal d common input 31a, for performing the voltage conversion on the first voltage (Vtn) or the second voltage (Vdr) and for outputting the driving current Id from the output terminal 31b. The control unit 32 is configured to control the current value of the driving current Id of the conversion unit 31. The first switch (flashing side switch 39tn) is configured to select whether to deliver the driving current Id to the first light source by means of the first signal (signal St) based on the first voltage (Vtn). The signal generation unit (timer circuit 33) is configured to receive the first voltage (Vtn) and the second voltage (Vdr) and to generate the second signal (signal Sd). The second switch (DRL side switch 39dr) is configured to select whether to supply the driving current Id to the second light source by means of the second signal (signal Sd). According to the above configuration, it is possible to use in common the conversion unit 31 and the control unit 32 for controlling the first light source (flashing light source 3) and the second source of light. light (source of DRL 4) and to switch the driving target according to the supply state of the supply voltage.
    [0024] In particular, the first and second voltages (Vtn, Vdr) constitute the power supply for light emission. When the first and second voltages are delivered as a light emission request signal, i.e. without the request signal from the vehicle side, it is possible to execute the transmission control. of light by appropriately switching the first light source and the second light source with the lighting circuit 2 to which the power supply and ground line are connected. Accordingly, it is possible to simplify the configuration of the lighting circuit 2 with respect to the two light sources when lighting is not performed at the same time, so as to reduce the cost. The lighting circuit 2 further comprises the third switch (switch 37) configured to, based on the second voltage (Vdr), interrupt the current flowing to the input terminal 31a of the conversion unit 31 during the period of time when the first voltage (Vtn) is delivered. As a result, it is possible to prevent a detection error because the vehicle-side system erroneously detects that the first light source is disconnected, when the input current due to the first voltage (Vtn) is not constant. because of the input current due to the second voltage (Vdr). That is, it is possible to appropriately detect the disconnection of the flashing light source 3 on the vehicle side. In addition, the signal generating unit (timer circuit 33) is configured to generate the second signal (Sd), so that the second switch (DRL side switch 39dr) continues not to select the supply of the signal. pilot current at the second light source (remains in the DESIRED state), even when the second voltage (Vdr) which is the DC voltage is delivered during the period of time when the first voltage (Vtn) is delivered, which is the intermittent voltage repeating the time period at the high level Ti and the time period at the low level T2 according to the predetermined cycle. Accordingly, when the first voltage (Vtn) for the first light source and the second voltage (Vdr) for the second light source are delivered at the same time, the first light source preferably emits light. Specifically, as shown in FIG. 4, the light emission from the flashing light source 3 is preferably performed and the light emission of the DRL source 4 is turned off during the time period. Flashing Tton active. Thus, the appropriate light emitting operations of the flashing light and the DRL are implemented. In addition, the signal generation unit (timer circuit 33) is configured to generate, as a second signal, the signal Sd in which the predetermined delay time Td is longer than the time period at the low level. T2 of the first voltage (Vtn) is applied to the waveform of the second voltage (Vdr). That is, the DRL side switch 39dr is ON with the predetermined time delay Td from the start of supply of the second voltage (Vdr) thereby allowing the DRL source 4 to emit light. By making the delay time Td longer than the low time period T2, it is possible to prevent the illumination of the DRL source 4 for a short time while the flashing light source 3 is flashing, As described above with reference to FIG. 5. In particular, in the explanatory embodiments, the counting operation of the timer circuit 33 is initialized / reset by means of the signal St, so that it is prevented. instant lighting appropriately. In the state where the first voltage (Vtn) and the second voltage (Vdr) are delivered at the same time, when the first light source (flashing light source 3) is switched from the flashing light emission. at the end state (time t4 in FIG. 3) of the flashing light emission due to the stopping of the supply of the first voltage (Vtn), the signal generation unit (timer circuit 33) generates the second signal (Sd) to activate the second switch after the predetermined time has elapsed (time t4) from the end time of the flashing direction change light emission. That is, even when the second voltage (Vdr) is delivered at the moment when the flashing light emission from the flashing light source 3 is terminated, the source of DRL 4 is not activated to start immediately. the emission of light. It is thus possible to clarify the end of the flashing light emission. In particular, after the flashing active time period Ton, the DRL source 4 starts the light emission when the delay time Td longer than the time period at the low level T2 has elapsed. As a result, the end of the flashing light emission is further clarified. In the explanatory embodiments, as described above, instantaneous illumination of the DRL is prevented during the flashing active time period Tton and the DRL is activated to emit light with the predetermined delay time Td after the flashing Tton active time period by means of the signal Sd from the timer circuit 33. It is thus possible to efficiently generate the signal and to save the cost by means of the simple configuration. In addition, the control unit 32 is configured to output the driving current Id having the current value Itu for the flashing light source 3 at least during the period of time when the flashing side switch 39tn is ON, i.e., during the period of time the flashing side switch 39tn selects supplying the driving current Id to the first light source (flashing light source 3). On the other hand, the control unit 32 is configured to control the conversion unit 31 to output the control current Id having the current value Idr for the source DRL 4 at least for the period of time where the DRL side switch 39dr is ON, i.e., during the period of time when the DRL side switch 39dr selects supply of the driving current Id to the second light source (DRL source 4). It is thus possible to implement light emission having a suitable brightness as a flashing light and DRL. In the explanatory embodiments, the present invention is applied to the two light sources 3, 4, which are the flashing lights and the daytime running light. Accordingly, it is possible to select the flashing light emission and the DRL emission and to implement the preferential lighting of the flashing light and the light emitting operation in view of the relationship between the fire. blinking and the DRL by means of the simple lighting circuit configuration. The present invention is not limited to circuit configurations and explanatory embodiment operations. The circuit configurations of FIGS. 2-7 are only examples and various specific configurations can be understood.
    [0025] In the explanatory embodiments, the flashing light and the DRL have been given as examples as first and second light sources. However, the invented concept of the present invention can also be applied to other combinations such as flashing light and a clearance light (CLL). Further, a CLL and its lighting circuit may be incorporated in the vehicle lamp device 1 having the configuration of Fig. 2. In the explanatory embodiments, the first light source (fire source blinking 3) and the second light source (DRL source 4) are connected in parallel with the conversion unit 31 but can be connected in series. For example, the first light source and the second light source are connected in series between the output terminal 31b of the conversion unit and the ground. A first branch switch is connected in parallel with the first light source. On the other hand, a second bypass switch is connected in parallel with the second light source. In this case, when the first switch is OFF, the piloting current is delivered to the first light source and when the second switch is DESALABLE, the piloting current is delivered to the second light source. Accordingly, the first switch and the second switch are respectively turned on / off by means of the first signal St and the second signal Sd, so that the operations described in the explanatory embodiments are implemented. In this case, on the other hand, since the first and second switches are the bypass switches, the relationship between the logic levels of the first and second signals and the AL I1VATION / DISABLE I1VATION of the first and second switches is opposite to the modes. explanatory work.
    权利要求:
    Claims (7)
    [0001]
    REVENDICATIONS1. An illumination circuit (2) configured to supply a driving current to a first light source (3) and a second light source (4) configured to perform a function different from that of the first light source (3) the lighting circuit (2) comprising: a conversion unit (31) configured to receive a first voltage (Vtn) for the first light source and a second voltage (Vdr) for the second light source (4) by via a common input terminal (31a), to perform a voltage conversion on the first voltage (Vtn) or the second voltage (Vdr), and to deliver the driving current from an output terminal ( 31b); a control unit (32) configured to control the current value of the driving current (Id) output from the conversion unit (31); a first switch (39tn) configured to select whether to deliver the driving current (Id) to the first light source (3) by means of a first signal (St) based on the first voltage (Vtn); a signal generation unit (33) configured to receive the first voltage (Vtn) and the second voltage (Vdr) and to generate a second signal (Sd); and a second switch (39dr) configured to select whether to deliver the driving current (Id) to the second light source (4) by means of the second signal (Sd). 25
    [0002]
    The illumination circuit (2) of claim 1, further comprising: a third switch (37) configured to, based on the second voltage (Vdr), interrupt current flowing to the input terminal (31a) of the conversion unit (31) during a period of time when the first voltage (Vtn) is delivered.
    [0003]
    The lighting circuit (2) according to claim 1 or 2, wherein the signal generating unit (33) is configured to generate the second signal (Sd) so that the second switch (39dr) continues to select not to deliver the driving current (Id) to the second light source (4), even when the second voltage (Vdr) which is a DC voltage is delivered, for a period of 3034949 when the first voltage (Vtn) which is an intermittent voltage repeating a period of time at the high level and a period of time at the low level according to a predetermined cycle.
    [0004]
    The lighting circuit (2) according to claim 3, wherein the signal generating unit (33) is configured to generate, as a second signal (Sd), a signal in which a predetermined time delay longer than the period of time at the low level of the first voltage (Vtn) is applied to a waveform of the second voltage (Vdr).
    [0005]
    The lighting circuit (2) according to any one of claims 1 to 4, wherein the control unit (32) is configured to control the conversion unit (31) to output the driving current. (Id) having a current value for the first light source (3) for at least a period of time when the first switch (39tn) selects supply of the driving current (Id) to the first light source (3) and for outputting the driving current (Id) having a current value for the second light source (4) at least for a period of time when the second switch (39dr) selects the supply of the driving current (Id) to the second light source.
    [0006]
    The lighting circuit (2) according to any one of claims 1 to 5, wherein the lighting circuit (2) is used for a vehicle lamp device (1), wherein the transmitting surface of light of the first light source (3) and the light-emitting surface of the second light source (4) are arranged closely or are used in common, in which the first light source (3) serves flashing light and, wherein the second light source (4) serves as a daytime running light.
    [0007]
    A vehicle lamp device (1) comprising: a first light source (3); A second light source (4); a lighting circuit (2) configured to supply a driving current (Id) to the first light source (3) and the second light source (4), the lighting circuit (2) including: conversion unit (31) configured to receive a first voltage (Vtn) for the first light source (3) and a second voltage (Vdr) for the second light source (4) through a terminal common input (31a), for performing a voltage conversion on the first voltage (Vtn) or the second voltage (Vdr), and for outputting the driving current (Id) from an output terminal (31b); a control unit (32) configured to control the current value of the driving current (Id) output by the conversion unit (31); A first switch (39tn) configured to select whether to deliver the driving current (Id) to the first light source (3) by means of a first signal based on the first voltage (Vtn); a signal generation unit (33) configured to receive the first voltage (Vtn) and the second voltage (Vdr) and to generate a second signal (Sd); and a second switch (39dr) configured to select whether to deliver the driving current (Id) to the second light source (4) by means of the second signal (Sd).
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    法律状态:
    2017-02-27| PLFP| Fee payment|Year of fee payment: 2 |
    2018-02-23| PLSC| Publication of the preliminary search report|Effective date: 20180223 |
    2018-02-28| PLFP| Fee payment|Year of fee payment: 3 |
    2020-03-12| PLFP| Fee payment|Year of fee payment: 5 |
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    JP2015078678A|JP6566511B2|2015-04-07|2015-04-07|Lighting circuit|
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