• 专利附录
  • 专利说明
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  • 类似技术
  • 同族专利
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    • 专利摘要:
    An illumination circuit (400) configured to turn on or off a semiconductor light source (302) based on an on / off command signal (S1), which includes a determination circuit impulse input means (402, 402a, 402b, 402c, 402d) and a control circuit (410) for receiving the on / off command signal (S1) which is in pulse form for controlling the ignition and which is at a constant level to control the extinction, determines whether or not the start / stop instruction signal (S1) is in the ignition state in which the start / stop instruction signal ( S1) is in pulse form and generates a determination signal (S2) which is enabled if the on / off command signal (S1) is in pulse form. The control circuit (410) does not supply or deliver to the semiconductor light source (302) a control current (ILD) if the determination signal (S2) is respectively enabled or canceled.
    公开号:FR3029269A1
    申请号:FR1561466
    申请日:2015-11-27
    公开日:2016-06-03
    发明作者:Tomoyuki Ichikawa；Toshihiko Kurebayashi
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    [0001] BACKGROUND Technical Field [0001] Examples of embodiments of the invention relate to a vehicle lamp for use in vehicles, etc. Associated Technique [0002] The primary source of light sources for vehicle lamps, particularly headlamps, was previously halogen lamps and HID (High Intensity Discharge) lamps. However, in recent years, to replace these types of lamps, vehicle lamps using a semiconductor light source such as an LED (light-emitting diode) have been developed. [0003] To further increase visibility, light sources using a laser diode (also called a "semiconductor laser") and a phosphor replacing an LED have been developed (see, for example, JP 2004-241142 A ). In the technique described in JP 2004-241142 A, a phosphor is irradiated with ultraviolet light (excitation light) from a laser diode and thereby emits white light towards the front of the vehicle lamp. A predetermined light distribution pattern is thus formed. In the technique described in 3P 2004-241142 A, the excitation light is not emitted towards the front of the vehicle lamp. Another type of light source is known, in which a laser diode generates blue excitation light in replacement of the ultraviolet light. Receiving the blue excitation light, a phosphor emits fluorescent light whose spectrum is in a longer wavelength range (from green to red) than the spectrum of excitation light. The excitation light incident on the phosphor is dispersed by the phosphor and loses coherence as it passes through the phosphor. The phosphor provides white light output including blue scattered light and green to red fluorescent light. [0005] For example, laser light sources are used to generate an additional high beam for illuminating an area farther away than for a high beam. Figure 1 is a block diagram of a 1200 lamp system for generating additional high beams. A left lamp (vehicle lamp) 1300L and a right lamp 1300R are similarly configured together. Each vehicle lamp 1300 includes a semiconductor light source (laser diode) 302, an ECU (lamp control unit) 310, and a lighting circuit 320. The lamp ECU 310 is connected to a vehicle ECU 202 via a bus 203 such as a CAN (Controller Area Network) or LIN (Local Interconnect Network). [0007] A current power source (not shown) is used as a power source for a high beam lighting system and a power source for the additional high beam lighting circuit 320 A switch 312 of the lamp ECU 310 is disposed on the path of supplying a battery voltage VBAT from a battery 204 to the lighting circuit 320. A CPU (central processing unit) 314 controls the battery. switching on / off a high beam and an additional high beam by means of the switch on / off control 312 on the basis of an instruction, vehicle speed information, etc., delivered by the vehicle ECU 202. [0008] To give a feeling of luxury, it is desirable that the amount of light of an additional light beam increases and decreases progressively over time, which is called "progressive ignition". And "progressive extinction". The progressive ignition can be achieved by using the phenomenon that a DC converter 322 gradually turns on when the switch 312 is turned on. On the other hand, with respect to the phase-out, the output current of the constant-current converter 322 can not be slowly decreased by simply turning off the switch 312. [0009] Thus, the lighting circuit 320 comprises a progressive on / off circuit 324. The progressive on / off circuit 324 gradually turns on and off by driving the constant current converter 322 according to an on / off command signal If received from the CPU 314.
    [0002] SUMMARY [0011] For example, it is assumed that the high level and the low level of the on / off switch signal S 1 are respectively assigned to the switching on and off of the semiconductor light source 302. case, if a signal line 304 for transmitting the on / off instruction signal Si is short-circuited high side (i.e., a short circuit with a line d supply), it becomes impossible to control the on / off command signal Si by means of the CPU 314, which can result in the semiconductor light source 302 not being extinguished when it should. , dazzling drivers of nearby vehicles. When the sense of the logic levels is reversed, if the signal line 304 is grounded (i.e., a short circuit to the ground), the source of Semiconductor light 302 can not be turned off when it should. The disconnection of the signal line 304 may produce a similar problem depending on how the lamp ECU 310 outputs the on / off instruction signal Si and how the progressive on / off circuit 324 receives the On / Off command signal Si. These situations can occur regardless of whether or not progressive firing and extinguishing is used. On the other hand, these situations are associated not only with an additional high beam but also with a high beam and a low beam. At least one exemplary embodiment of the invention has been realized in the above circumstances, and provides a lighting circuit that can extinguish a semiconductor light source at the onset of the invention. an anomaly in a signal line that transmits an on / off instruction signal. [0013] (Appearance 1) According to an exemplary embodiment, a lighting circuit is configured to turn on or off a semiconductor light source according to an on / off instruction signal 10 from a processor. The lighting circuit comprises a pulse input determining circuit and a control circuit. The pulse input determining circuit receives from the processor the start / turn off command signal which is in pulse form for controlling the ignition and which is at a constant level to control extinguishing. The pulse input determining circuit determines whether or not the on / off command signal is in the firing state in which the firing / off command signal is in pulse form. The pulse input determining circuit generates a judgment signal which is validated if the ignition / extinction command signal is in pulse form. The control circuit supplies to the semiconductor light source a control current if the determination signal is enabled. The control circuit does not deliver the control current to the semiconductor light source if the determination signal is canceled. In the event of an anomaly such as a disconnection, a high-side short-circuit or a grounding in a line which transmits the on / off command signal, the processor can no longer carry out an operation. control using the start / stop instruction signal. However, in either case, the start / stop instruction signal is kept at a constant level. Accordingly, with the above configuration, the semiconductor light source can be turned off not only when the processor controls the extinction of the semiconductor light source but also the occurrence of an abnormality. Security is thus reinforced. The expression "the ignition / extinguishing instruction signal is an impulse signal" means not only that the on / off instruction signal makes alternating transitions between two different potentials but also that the signal The on / off instruction 5 performs alternating transitions between a predetermined potential and a high impedance state. The expression "the on / off instruction signal is at a constant level" means not only that the start / stop instruction signal is maintained at a predetermined potential, but also that the instruction signal 10 ignition / extinction is maintained in a high impedance state. [0015] (Appearance 2) In the illumination circuit according to (aspect 1), the pulse input determining circuit may comprise a capacitor, a charge / discharge circuit and a determination section. The charging / discharging circuit charges the capacitor (or causes the capacitor discharge) in response to detecting an edge of the on / off instruction signal. The charging / discharging circuit causes the discharge of the capacitor (or the capacitor charge) if no edge of the ON / OFF command signal is detected. The determining section determines whether the on / off command signal indicates an on / off based on the result of comparing the capacitor voltage with a predetermined threshold voltage. When the ON / OFF instruction signal is in pulse form, edges are periodically detected. As a result, the capacitor is charged (or discharged) periodically and the capacitor voltage increases (or decreases). On the other hand, when the start / stop instruction signal is kept constant, the capacitor continues to discharge instead of being periodically charged (or discharged). As a result, the capacitor voltage decreases (or increases). Accordingly, with this configuration, the fact that the start / stop instruction signal is in the on state or the off state can be determined based on the capacitor voltage. [Appear 3] In the illumination circuit according to (aspect 2), the charging / discharging circuit may include an edge detection circuit, a current source, a discharge path and a comparison transistor. The edge detection circuit detects the edge of the on / off instruction signal. The current source supplies the capacitor with a current as a function of the output of the edge detection circuit. The capacitor discharges through the discharge path. The comparison transistor receives the voltage of the capacitor on its control terminal. In the ignition state, the current source charges the capacitor repeatedly in response to periodic edge detections. Thus, the capacitor voltage is increased and the comparison transistor is turned on. In the quench state, the capacitor discharges through the discharge path. Thus, the voltage of the capacitor decreases and the comparison transistor is blocked. As a result, the fact that the start / stop instruction signal is in the on state or in the off state can be determined as a function of the on and off state of the comparison transistor. [0017] 20 (Appearance 4) The edge detection circuit may include a differentiation circuit which differentiates the start / stop instruction signal. [0018] (Appearance 5) In the illumination circuit according to (any Aspects 1-4), the impulse input determining circuit may include a retriggerable monostable multivibrator receiving on its trigger input terminal. a trigger signal corresponding to the on / off instruction signal. When the ON / OFF instruction signal is in the ON state, the retriggerable monostable multivibrator is repeatedly triggered by trigger signals corresponding to the ON / OFF instruction signal. As a result, the output signal of the retriggerable monostable multivibrator is kept unstable. On the other hand, when the ON / OFF instruction signal is in the OFF state, the output of the retriggerable monostable multivibrator is kept stable. Accordingly, the fact that the ignition / extinguishing command signal is in the on state or in the quench state can be determined based on the state of the quench signal. output of the monostable multivibrator retriggerable. [0019] 5 (Appearance 6) The pulse input determining circuit may further include a low pass filter which is disposed downstream of the retriggerable monostable multivibrator. In this case, it is possible to reduce the sensitivity of switching from the quenching state to the ignition state and thus to prevent an incorrect ignition. [Aspect 7] In the illumination circuit according to (aspect 1), the pulse input determining circuit may include an edge detection circuit, a non-releasable monostable multivibrator and a low pass filter. The edge detection circuit detects the edge of the on / off instruction signal. The non-releasable monostable multivibrator receives on its trigger input terminal a trigger signal corresponding to the output of the edge detection circuit. The low pass filter is disposed downstream of the monostable multivibrator not retriggerable. When the start / stop instruction signal is in the OFF state, the output signal of the non-retriggerable monostable multivibrator is kept stable. On the other hand, when the ON / OFF instruction signal is in the ON state, the output signal of the non-retriggerable monostable multivibrator is kept unstable in response to the trigger signals. The steady state is restored temporarily after a time lapse of a certain time constant and the unstable state is restarted by the next trigger signal. In this way, the output signal of the non-releasable monostable multivibrator repeats the steady state and the unstable state. The fact that the start / stop instruction signal is in the on state or in the off state can be determined by arranging the low pass filter downstream of the non-releasable monostable multivibrator so as to eliminate a steady state short. [0021] 302 926 9 8 (Aspect 8) The edge detection circuit may include a differentiation circuit that differentiates the ignition / extinguishing instruction signal. [0022] 5 (Appearance 9) In the illumination circuit according to (aspect 1), the pulse input determining circuit may include a capacitor, a charge / discharge circuit and a determination section. The charge / discharge circuit charges the capacitor when the on / off instruction signal is at a first level. The charging / discharging circuit causes the capacitor to discharge when the on / off instruction signal is at a second level. The determining section compares the voltage of the capacitor with the first voltage and the second voltage. The determining section determines whether the start / stop instruction signal indicates ignition or extinction, based on the result of the comparison. The charging rate and the discharging rate are set so that the capacitor voltage is between a first voltage and a second voltage when the ignition / extinction command signal is in pulse form. With this configuration, it becomes possible to determine whether or not the on / off instruction signal is in pulse form. [0023] (Appearance 10) The semiconductor light source may include a laser diode and a phosphor. The laser diode emits excitation light. The phosphor is disposed on the optical axis of the excitation light. The phosphor is excited by the excitation light to emit fluorescent light. The light source is configured to generate white output light including the spectrum of the excitation light and the spectrum of the fluorescent light. In this type of light source, the appearance of an anomaly in the phosphor can cause a direct emission of the excitation light, which is dangerous. The use of the above-described light circuit in a lamp having this semiconductor light source improves security, since the emission of excitation light can be reliably stopped even in the case of occurrences 302 926 9 simultaneity of an anomaly in the phosphor and a high-side short circuit, a grounding, a disconnection or the like in a line. [0024] (Appearance 11) According to another exemplary embodiment, a lamp system comprises a right lamp and a left lamp. Each of the right and left lamps has a semiconductor light source, a lamp ECU and a lighting circuit. The lamp ECU generates an ON / OFF instruction signal to control the ON or OFF of the semiconductor light source. The lighting circuit supplies a current to the semiconductor light source. The illumination circuit of the right lamp illuminates the semiconductor light source of the right lamp if both the start / stop instruction signal generated by the lamp ECU of the right lamp and the signal of On / off instruction generated by the lamp ECU of the left lamp controls ignition. The left lamp light circuit turns on the semiconductor light source of the left lamp if both the on / off instruction signal generated by the left lamp lamp ECU and the signal of the left lamp. On / off instructions generated by the lamp ECU of the right lamp control the ignition. This configuration improves security because the semiconductor light source can also be turned off when an anomaly occurs. The different exemplary embodiments of the invention make it possible to extinguish a semiconductor light source when an anomaly occurs in a signal line that transmits an ignition instruction signal. extinction. 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. Figure 1 is a block diagram of a lamp system that generates additional high beam; Fig. 2 is a block diagram of a vehicle lamp including a lighting circuit according to a first exemplary embodiment; Fig. 3 is a waveform diagram showing the operation of the vehicle lamp of Fig. 2; Figs. 4A and 4B are circuit diagrams of an impulse input determining circuit of a first example; Figs. 5A and 5B are waveform diagrams showing the operation of the pulse input determining circuit of Fig. 4B; Fig. 6 is a diagram of an impulse input determining circuit of a second example; Fig. 7 is a diagram of an impulse input determining circuit of a third example; Figs. 8A-8C are waveform diagrams showing the operation of the pulse input determining circuit of Fig. 7; Fig. 9 is a diagram of an impulse input determining circuit of a fourth example; Fig. 10 is a block diagram of a lamp system according to a second exemplary embodiment; and Fig. 11 is a waveform diagram illustrating the operation of the lamp system of Fig. 10.
    [0003] DETAILED DESCRIPTION [0028] Exemplary embodiments of the invention will be described hereinafter with reference to the accompanying drawings. Identical or equivalent constituent elements shown in the figures receive the same respective reference symbols and redundant descriptions will be avoided as appropriate. The exemplary embodiments are only examples and should not be construed as limiting the invention. All the features described in the exemplary embodiments and combinations thereof are not necessarily essential to the invention. In this description, a state in which an element A and an element B are connected to each other comprises not only a state in which they are connected directly and physically to each other. other, but also a state in which they are indirectly connected to each other via an element having no significant influence on their state of electrical connection or affecting the function or the effect achieved through their connection. Likewise, a state in which an element C is arranged (or provided) between an element A and an element B comprises not only a state in which the element A and the element C or the element B and the element C are connected directly to one another but also to a state in which they are connected indirectly to one another via an element having no significant influence on their electrical connection state or not affecting the function or effect achieved by their connection. In this description, symbols which represent voltage signals, current signals, etc., and symbols which represent circuit elements such as resistors and capacitors 20 may represent voltage values, values currents, resistance values, capacitance values, etc., if necessary. [0031] FIRST EXAMPLE OF EMBODIMENT FIG. 2 is a block diagram of a vehicle lamp 25 300 including a lighting circuit 400 according to a first exemplary embodiment. As in the case of Figure 1, the vehicle lamp 300 may be a vehicle lamp which generates any of an additional high beam, a normal high beam or a low beam. Figure 2 shows a lighting system 200 as a whole. The vehicle lamp 300 comprises a semiconductor light source 302, a lamp ECU 310 and a lighting circuit 400. The lighting circuit 400 turns on or off the semiconductor light source 302 as a function of the light source. an on / off instruction signal Si from a processor (CPU) 314. The semiconductor light source 302 is for example a laser diode. In the first exemplary embodiment, the on / off instruction signal Si which is generated by the CPU 314 is in pulsed form in an ignition state cpoN to order ignition. On the other hand, the on / off command signal Si is at a constant level (i.e., in steady state) in an OFF state% OFF to order the extinction.
    [0004] The ignition state cpoN may be a state in which the on / off instruction signal Si alternately performs transitions between two different potentials (for example, a high and a low level, a high level and a level intermediate or intermediate level and a low level). As a variant, the ignition state cpoN may be a state in which the start / stop instruction signal Si alternately carries out transitions between a predetermined potential (high level, low level or intermediate level) and a high-level state. impedance. On the other hand, the extinguishing state cpoFF may be a state in which the on / off instruction signal Si remains at a predetermined potential (high, low or intermediate). Alternatively, the OFF state TOFF may be a state in which the ON / OFF instruction signal S1 remains in a high impedance state. In the first exemplary embodiment, it is assumed that in the WON ignition state, the ignition / extinction instruction signal Si alternately goes high (power supply voltage VDD for example). ) and at the low level (VGND mass voltage) with a predetermined cycle and that in the OFF state cpoFF, the level of the ON / OFF instruction signal Si is set low (VGND mass voltage) The lighting circuit 400 comprises an impulse input determining circuit 402 and a control circuit 410. The impulse input determining circuit 402 receives the on / off command signal Si and determines if the ON / OFF instruction signal SI is or is not in the ignition state CPNN, in which the ON / OFF instruction signal SI is in pulse form. If the ON / OFF command signal 51 is in the ignition state CPN, the pulse input determination circuit 402 sets a determination signal S2. When the determination signal S2 is enabled (for example, the determination signal S2 is high), the control circuit 410 delivers a control current ILD to the semiconductor light source 302. On the other hand when the determination signal S2 is canceled (for example, the determination signal S2 is low), the control circuit 410 does not supply control current ILD to the semiconductor light source 302. [0037] control circuit 410 comprises for example a converter 412 and a lighting control circuit 414. The converter 412 comprises a switching converter (DC-DC converter) which receives a supply source voltage VFii which is delivered by the intermediate switch 312 and which increases or decreases the power source voltage VFii. There is no limitation to the topology of the 412 converter; a suitable topology may be chosen depending on the type, number of constituent elements, etc., of the semiconductor light source 302. [0038] The illumination control circuit 414 detects the ILD current flowing through the light source semiconductor 302 and controls the converter 412 to match the ILD current with a reference value TREF corresponding to a target light amount of the semiconductor light source 302. There is no limitation to the type of circuit The lighting control circuit 414 may be any one of a pulse width modulation type controller, a pulse frequency modulation type controller, a controller of the type to be provided. hysteresis control, etc. A lighting control circuit 414 having a progressive ignition function can be implemented by slowly increasing the reference value TREF from the moment when the determination signal S2 is started. An illumination control circuit 414 having a progressive extinction function can be implemented by slowly decreasing the reference value TREF from the moment when the determination signal S2 is started. The description of the basic configuration of the vehicle lamp 300 is complete. The manner in which the vehicle lamp 300 operates will then be described below. FIG. 3 is a waveform diagram illustrating how the vehicle lamp 300 of FIG. 2 operates. Before the time t1, the signal line 304 is in a normal state and the instruction signal On / Off switch is transmitted correctly. During the interval A, to turn on the semiconductor light source 302, the CPU 314 generates a pulse ON / OFF command signal Si.
    [0005] Since the signal line 304 is in the normal state, the pulse input determining circuit 402 receives the pulse input signal and thereby generates a validated determination signal S2. Triggered by the start of the positioning of the determination signal S2, the illumination control circuit 414 slowly increases the control current ILD which is delivered to the semiconductor light source 302 to produce a progressive ignition. The illumination control circuit 414 then stabilizes the control current ILD at the target value TREF and thereby maintains the amount of light of the semiconductor light source 302 constant. [0041] During the interval B, to turn off the source semiconductor light 302, the CPU 314 generates an on / off command signal at the low level S1. Since no pulse appears at the input of the pulse input determination circuit 402, the determination circuit pulse input 402 generates a canceled determination signal S2. Triggered by the start of the cancellation of the determination signal S2, the lighting control circuit 414 slowly decreases the control current ILD which is delivered to the semiconductor light source 302, producing a progressive extinction. It is assumed that the signal line 304 is subject to a high short circuit at time t1. In the high-side short of the signal line 304, the on / off command signal Si is set to the high voltage. Since no pulse appears on the input terminal of the pulse input determination circuit 402, the determination signal S2 is kept canceled. As a result, the semiconductor light source 302 receives no ILD control current and is thus kept off. As described above, the security of the lighting circuit 400 according to the first exemplary embodiment is improved because the semiconductor light source 302 is turned off not only when its extinction is controlled by the processor 314, but also when an anomaly such as a high-side short circuit, a ground connection or a disconnection has occurred. The invention can be implemented by various types of circuits conforming to the block diagram of Figure 2 and the description above. Specific examples of these circuits will be described below. Figures 4A and 4B are circuit diagrams of an impulse input determining circuit 402a of a first example. As shown in FIG. 4A, the pulse input determining circuit 402a comprises a charge / discharge circuit 420, a capacitor C2 and a determination section 430. The potential at one end of the capacitor C2 is fixed. The charge / discharge circuit 420 charges the capacitor C2 in response to the detection of the edge of the start / stop instruction signal Si. If no edge is detected, the charge / discharge circuit 420 causes the discharge of the capacitor C2. The charging operation and the discharging operation of the charging / discharging circuit 420 may be replaced by each other. The determining section 430 generates a determination signal S2 as a function of the result of the comparison between the voltage Vc2 of the capacitor C2 and a predetermined threshold voltage VTH. FIG. 4B shows the configuration of the impulse input determining circuit 402a more specifically than that shown in FIG. 4A. In this example, the level of positioning (ignition) and cancellation (extinction) of the determination signal S2 are respectively a low level and a high level. The charging / discharging circuit 420 includes an edge detection circuit 422, a current source 424 and a discharge path 426. The edge detection circuit 422 detects the positive edge of the start / stop instruction signal Si The edge detection circuit 422 may be configured for example using a differentiation circuit (high pass filter). More specifically, the edge detection circuit 422 comprises a transistor Tri, a resistor R1, a capacitor C1, a diode D1 and a resistor Rb2. The series connection of capacitor C1 and resistor Rb2 constitutes the differentiation circuit. Diode D1 serves as a chocking device to prevent oscillation to the negative voltage due to the negative edge of the start / stop instruction signal Si. Current source 424 includes transistors Tr2, Tr3 and a resistor. R2. When the positive edge of the on / off instruction signal Si is detected, currents flow through transistors Tr2, Tr3 and a current is supplied to capacitor C2. When a pulse on / off command signal S i is input and positive edges are detected at predetermined intervals, the capacitor C2 is repeatedly charged by the current source 424. discharge 426 has a resistor Rb4. Capacitor C2 discharges through resistor Rb4. The charging current of the current source 424 is set to be larger than the discharge current flowing through the discharge path 426. [0049] The determining section 430 includes a transistor Tr4 and a resistor R3. The voltage Vc2 of the capacitor C2 is divided by a voltage dividing circuit 35 constituted by the discharge path 426, and a divided voltage is inputted to the base of the transistor Tr4. When the base-emitter voltage of the transistor Tr4 becomes greater than its threshold value (direct voltage Vbe 0.6 V), the transistor Tr4 is turned on and the determination signal S2 goes low (validated). Figures 5A and 5B are waveform diagrams showing the operation of the pulse input determining circuit 402a of Figure 4B. The potential of the connection node between the capacitor C1 and the resistor Rb2 is represented by Vx. Figure 5A shows the waveforms that appear at the time of ignition control. Figure 5B shows the waveforms that appear at the time of the shutdown command. Care must be taken that the time scales of the horizontal axis of Figures 5A and 5B are different from each other. As described above, the pulse input determining circuit 402a of FIG. 4B makes it possible to determine whether or not the pulse ON / OFF instruction signal in pulse form is input-applied. FIG. 6 is a circuit diagram of an impulse input determining circuit 402b according to a second example. The pulse input determining circuit 402b comprises an input circuit 432 and a retriggerable monostable multivibrator 434. The input circuit 432 is an inverter circuit having a transistor Tri and a resistor Ri. The input circuit 432 generates a trigger signal S3 (reverse logic) corresponding to the on / off command signal S1. The monostable multivibrator 434 receives the trigger signal S3 on its trigger input terminal. The oscillation cycle of the monostable multivibrator 434 is set to be longer than the cycle of the pulse on / off instruction signal Si in pulse form. When the ON / OFF command signal Si is in the ON state WON, in which the ON / OFF instruction signal S1 is in pulse form, the monostable multivibrator 434 is triggered by Repeatedly by the trigger signal S3 which corresponds to the on / off command signal S1. As a result, the output terminal Q of the monostable multivibrator 434 continues to output an unstable signal. Conversely, when the on / off instruction signal Si is in the off state woFF, the output terminal Q of the monostable multivibrator 434 continues to output a stable signal. As a result, the fact that the start / stop instruction signal Si is in the ignition state cpoN or in the extinction state WoFF can be determined using the output signal of the output terminal Q monostable multivibrator 434 as the determination signal S2. In the pulse input determining circuit 402a of FIGS. 4A and 4B, when the duty cycle (pulse width) of the start / turn-off command signal Si becomes large (or small), the signal of As a result, the charging current may become insufficient and the pulse input determining circuit 402a may cancel the determination signal S2, even if a pulse signal is inputted. The pulse input determining circuit 402b of FIG. 6 can detect a pulse signal regardless of the duty cycle and pulse width of the on / off command signal Si. [0055] The determination signal Pulse input 402b of FIG. 6 provides an advantage that it is possible to freely change the duty cycle and / or pulse width of the on / off command signal Si. indicating the amount of light can be added to the on / off instruction signal Si by performing a pulse width modulation of the start / turn off command signal Si based on the target light amount of the semiconductor light source 302. In this case, since an on / off command signal Si having a duty cycle of 100% is a dc signal for controlling the quench state, the antity of light is controlled using a duty cycle which is less than 100% as the upper limit without using the duty cycle of 100 ° / 0. An illumination circuit 400 is added to the lighting circuit 400 which detects the duty cycle of the on / off command signal Si separately from the pulse input determination circuit 402b. Alternatively, information indicating the amount of light can be added to the on / off instruction signal Si by frequency pulse modulation of the on / off instruction signal Si on the basis of the amount of light. [0056] A low-pass filter (not shown) may further be disposed downstream of the monostable multivibrator 434. This reduces the sensitivity to switching from the ON state to the ON state. the state turned off and thus, to prevent an incorrect ignition. FIG. 7 is a circuit diagram of an impulse input determining circuit 402c of a third example. The circuit configuration of the one-shot multivibrator 434 used in FIG. 6 is complex and thus it must be implemented by a dedicated IC (integrated circuit) which results in increased cost. The pulse input determining circuit 402c of FIG. 7 uses a non-releasable monostable multivibrator 436 which can be configured using a small number of elements. The pulse input determining circuit 402c comprises an edge detection circuit 422, the monostable multivibrator 436, a low pass filter 438 and an output circuit 440. The edge detection circuit 422 detects the positive edge of the start / stop instruction signal Si. The configuration of the edge detection circuit 422 is similar to that shown in FIG. 4B. The monostable multivibrator 436 receives, on its trigger input 437, a trigger signal S3 corresponding to the output signal of the edge detection circuit 422. The low pass filter 438 is disposed downstream of the monostable multivibrator 436. The output circuit 440 digitizes the output signal of the low pass filter 438 and outputs a resultant signal. FIGS. 8A-8C are waveform diagrams showing the operation of the pulse input determining circuit 402c of FIG. 7. FIGS. 8A-8C show sets of shapes when the duty cycle of the on / off instruction signal Si is 10%, 50% and 90 ° h, respectively. The pulse input determining circuit 402c of Fig. 7 can determine whether or not the on / off command signal S1 is in the ignition state cpoN, irrespective of the duty cycle. FIG. 9 is a circuit diagram of an impulse input determining circuit 402d of a fourth example. The pulse input determining circuit 402d has the same basic configuration as the pulse input determining circuit 402a of Fig. 4A. A charging / discharging circuit 420d charges the capacitor C2 as a function of the on / off command signal S1. More specifically, the charge / discharge circuit 420d charges the capacitor C2 when the instruction signal of On / Off If is at a first level (for example, at low level). On the other hand, the charge / discharge circuit 420d causes the capacitor C2 to discharge when the on / off instruction signal S1 is at a second level (e.g., high). The charging speed and the discharging rate are defined so that the voltage Vc2 of the capacitor C2 is in a voltage range from Va to Vb (Va <Vb) when the ignition / extinction command signal Si is in impulse form. A determination section 430d positions the determination signal S2 if the voltage Vc2 of the capacitor is in the voltage range Va to Vb. On the other hand, the determining section 430d cancels the determination signal S2 if the voltage Vc2 of the capacitor is not in the voltage range Va to Vb. The charging / discharging circuit 420d comprises for example a transistor Tri and resistors R1, R2. When the on / off command signal Si is low, transistor Tri is on and capacitor C2 is charged through resistor R1. The charging speed is determined by the resistance R1. When the on / off instruction signal Si is high, the transistor Tri is off and the capacitor C2 discharges through the resistors R1, R2. The discharge velocity is determined by the resistors R1, R2. The charging speed and the discharging speed can be defined, for example, so that the voltage Vc2 of the capacitor approaches the median voltage Vcc / 2 between the voltage of the supply source Vcc and the voltage of mass VGND (= 0 V) when the duty cycle of the start / stop instruction signal Si is 50 ° h. The determining section 430d compares the voltage Vc2 of the capacitor with the two threshold voltages Va and Vb. The determining section 430d comprises transistors Tr3, Tr4, a resistor R3 and a transistor Tr2. Let VGS (TH2) and VGS (TH3) respectively represent the gate-source threshold voltages of the transistors Tr2, Tr3. When the relation VGS (TH2) <VC2 <VCC - VGgrii3) is verified, the two transistors Tr2, Tr3 are on, the transistor Tr4 is on and the determination signal S2 goes high (. = '/ Cc). When 20 Vc2 <VGg1-H2), the transistor Tr2 is off and the transistor Tr3 is on and the determination signal S2 goes low (VGND). When Vcc - VGs (TH3) <V2, the transistor Tr2 is on and the transistor Tr3 is off and the determination signal S2 goes low. With this configuration, it is possible to determine whether the voltage Vc2 of the capacitor is or is not in the voltage range Va to Vb with the first voltage Va and the second voltage Vb respectively equal to VGS (TH2) and Vcc - VGS (TH3). The determination section 430d may consist of a window comparator including two voltage comparators and a logic gate. The two voltage comparators compare the voltage Vc2 of the capacitor with the voltages Va and Vb. The logic gate performs a logic operation on the output signals of the two voltage comparators. [0066] SECOND EXAMPLE OF EMBODIMENT FIG. 10 is a block diagram of a lamp system 200 according to a second exemplary embodiment. The lamp system 200 has the same basic configuration as the lamp system 1200 shown in FIG. 1. The lamp system 200 includes a vehicle ECU 202, a battery 204, a right lamp (vehicle lamp) 300R and a 300L left lamp. The right and left 300R, 300L lamps have similar configurations to each other. Cross-connections (206, 208) are arranged between the right lamp 300R and the left lamp 300 L. The crossed interconnection 206 transmits an on / off command signal S1R of the right lamp 200R to the lamp Conversely, the crossed interconnection 208 transmits an on / off command signal Sil from the left lamp 200L to the right lamp 300 R. The lighting circuit 320R of the right lamp 300R turns on semiconductor light source 302R when both (i) the on / off command signal S1R for the lighting circuit 320R and (ii) the on / off command signal S1L, which is In the same way, the lighting circuit 320L of the left-hand lamp 300L turns on the semiconductor light source 302L when at the same time (i) the S1L on / off command signal for the circuit 320L and (ii) the S1R on / off instruction signal which is inputted through the cross-connect 206 controls the ignition. The lighting circuits 320R, 320L respectively comprise logic gates 326R, 326L which perform a logic operation on the on / off command signals S1R, S1L. For example, in a platform in which the respective on / off instruction signals S1R, S1L go high when controlling the ignition, the logic gates 326R, 326L may be operated by AND doors. Those skilled in the art will understand that the logical equation representing the logic gates 326R, 326L and the configuration of the logic gates 326R, 326L can be varied depending on the logic levels of the respective signals. The output signals (determination signals) S4R, S4L of the logic gates 326R, 326L are enabled (for example, the output signals S4R, S4L are at the high level) when the two ignition command signals / extinction S1R, S1L control the ignition. Progressive ignition / extinction circuits 324R, 324L cause the start of operation of the constant current converter 322R, 322L when the determination signals S4R, S4L are started. The description of the configuration of the lamp system 200 is complete. The way the lamp system 200 operates will then be described below.
    [0006] Fig. 11 is a waveform diagram showing how the lamp system 200 of Fig. 10 operates. Before the time t1, the signal lines 340R, 340L are both in a normal state, and the signal signals on / off instruction S1R, Sil are transmitted correctly. During the interval A, to control the switching on of the semiconductor light sources 302R, 302L, the CPUs 314R, 314L generate high level on / off command signals S1R, Sil, respectively. At this time, the output signals (determination signals) S4R, S4L of the logic gates 326R, 326L go high. Progressive ON / OFF circuits 324R, 324L slowly increase ILD control currents producing progressive ignition. The progressive ignition / extinction circuits 324R, 324L then stabilize the ILD control currents and thereby maintain the light amounts of the semiconductor light sources 302R, 302L constant. During the interval B, to control the extinction of the semiconductor light sources 302R, 302L, the CPUs 314R, 314L respectively generate low level on / off instruction signals S1R, S1L. As a result, the determination signals S4R, S4L go low and the semiconductor light sources 302R, 302L are progressively extinguished. [0073] It is assumed that the signal line 304R is short-circuited high side at time t1. During the high side short of the signal line 304R, the on / off command signal S1R is set to the high level voltage corresponding to the ignition command. At this time, since the other on / off command signal Sil is low, the determination signals S4R, S4L of the right and left lamps 300R, 300L are kept low. As a result, the two semiconductor light sources 302R, 302L are kept off. As described above, the security of the lamp system 200 according to the second exemplary embodiment is improved because the semiconductor light sources 302R, 302L may be extinguished when an abnormality has occurred such that a high side short circuit, grounding or disconnection, in any of the output signal lines of the processors 314R, 314L. [0075] The lamp system 200 of FIG. 10 can be configured so that when the start / turn off command signals S1R, S1L are in the ignition state, the ignition instruction signals SIR, S1L are in pulse form as in the first exemplary embodiment. In this case, the same pulse input determining circuits 402 as used in the first exemplary embodiment may be respectively arranged upstream of logic gates 326R, 326L. In this case, the determination signals S2R, S2L are inputted to the logic gates 326R, 326L. [0076] A common power source (not shown) is used as a power source for a high beam lighting system and power sources for the additional high beam lighting circuit 320. A semiconductor switch 312 of the lamp ECU 310 is disposed on the supply path of a battery voltage VBAT from the battery 204 to the illumination circuit 320. Each CPU 314 controls the ignition. switching off the main beam and additional road lights by on / off control of the semiconductor switch 312 on the basis of an instruction, vehicle speed information, etc., issued by the ECU The invention has been described above by way of the exemplary embodiment using the specific terms. However, the exemplary embodiment merely shows the principle and applications of the invention. The exemplary embodiment may include various modifications and the arrangement of the constituent elements may be varied in a variety of ways without departing from the concept of the invention as defined by the claims.
    权利要求:
    Claims (7)
    [0001]
    REVENDICATIONS1. A lighting circuit (400) for turning on or off a semiconductor light source (302) according to an on / off command signal (Si) from a processor (314), the circuit of illumination (400) being characterized in that it comprises: an impulse input determining circuit (402, 402a, 402b, 402c, 402d) which receives from the processor (314) the turn-on command signal ( If) which is in pulse form to control the ignition and which is at a constant level to control extinguishing, determines whether or not the on / off instruction signal (Si) is in the state of ignition. ignition (cpoN) in which the ignition / extinction command signal (Si) is in pulse form, and generates a determination signal (S2) which is enabled if the start / stop command signal (Si) is in pulse form; and a control circuit (410) which supplies a control current (ILD) to the semiconductor light source (302) if the determination signal (S2) is enabled, and does not supply the control current (ILD). to the semiconductor light source (302) if the determination signal (S2) is canceled.
    [0002]
    The illumination circuit (400) according to claim 1, wherein the pulse input determining circuit (402a) comprises a capacitor (C2), a charge / discharge circuit (420) which charges the capacitor (C2). ) or causes the discharge of the capacitor (C2) in response to the detection of an edge of the on / off command signal (Si), and causes the discharge of the capacitor (C2) or charges the capacitor (C2) if no edge of the start / stop instruction signal (Si) is detected, and a determining section (430) which determines whether the start / stop instruction signal (Si) indicates an ignition or on the basis of the result of the comparison between the voltage (Vc2) of the capacitor (C2) and a predetermined threshold voltage (VTH).
    [0003]
    The illumination circuit (400) according to claim 2, wherein the charging / discharging circuit (420) comprises an edge detection circuit (422) which detects the edge of the start / stop instruction signal. (Si), a current source (424) which supplies to the capacitor (C2) a current as a function of the output of the edge detection circuit (422), a discharge path (426) through which the capacitor discharges (C2), and a comparison transistor which receives the voltage (Vc2) of the capacitor (C2) on its control terminal.
    [0004]
    The illumination circuit (400) according to any one of claims 1 to 3, wherein the impulse input determining circuit (402b) comprises a retriggerable monostable multivibrator (434) which receives on its input terminal triggering a trigger signal (S3) corresponding to the on / off command signal (Si).
    [0005]
    The lighting circuit (400) according to claim 1, wherein the pulse input determining circuit (402c) comprises an edge detection circuit (422) which detects the edge of the ignition instruction signal. / off (Si), a non-releasable monostable multivibrator (436) which receives on its trigger input terminal a trigger signal (S3) corresponding to the output of the edge detection circuit (422), and a pass filter low (438) which is disposed downstream of the non-retriggerable monostable multivibrator (436).
    [0006]
    The lighting circuit (400) according to claim 1, wherein the pulse input determining circuit (402d) comprises: a capacitor (C2), a charge / discharge circuit (420d) which charges the capacitor ( C) when the on / off instruction signal (S1) is at a first level, and causes the capacitor (C) to discharge when the start / turn off instruction signal (S1) is at a second level, the charging speed and the discharging speed being defined so that the voltage (Vc2) of the capacitor (C2) is between a first voltage (VGso-Fi2)) and a second voltage (Vcc - VGs (ni3)) when the start / stop instruction signal (Si) is in pulse form, and a determining section (430d) which compares the voltage (Vc2) of the capacitor (C) with the first voltage ( VGso-H2)) and the second voltage (Vcc - VGS (TI-13)), and determines whether the ignition / firing instruction signal (Si) indicates an ON or OFF, based on the result of the comparison.
    [0007]
    A lamp system (200) comprising: a right lamp (300R); and a left lamp (300L), characterized in that each of the right and left lamps (300R, 300L) comprises a semiconductor light source (302R, 302L), a lamp ECU (314R, 314L) which generates a signal ignition / quenching instruction (SIR, S1L) for controlling the switching on or off of the semiconductor light source (302R, 302L), and a lighting circuit (320R, 320L) which delivers a current (ILD) to the semiconductor light source (302R, 302L), the right lamp (300R) lighting circuit (320R) turns on the right lamp (300R) semiconductor light source (302R) if both the on / off command signal (S1R) generated by the lamp ECU (314R) of the right lamp (300R) and the on / off command signal (S1L) generated by the Left lamp (314L) lamp ECU (3000 control the ignition, and 30 (320L) left lamp (300L) lighting circuit turns on the light source to semicon driver (302L) of the left lamp (300L) if both the on / off command signal (S1L) generated by the lamp ECU (314L) of the left lamp (300L) and the signal of on / off instruction (S1R) generated by the lamp ECU (314R) of the right lamp (300R) controls the ignition.
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    同族专利:
    公开号 | 公开日
    JP2016103367A|2016-06-02|
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    CN105657935A|2016-06-08|
    CN109152175A|2019-01-04|
    CN109152175B|2020-06-05|
    US20160156152A1|2016-06-02|
    JP6691348B2|2020-04-28|
    FR3029269B1|2020-10-09|
    DE102015223574A1|2016-06-02|
    US9531157B2|2016-12-27|
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    法律状态:
    2016-10-07| PLFP| Fee payment|Year of fee payment: 2 |
    2017-10-11| PLFP| Fee payment|Year of fee payment: 3 |
    2018-05-25| PLSC| Publication of the preliminary search report|Effective date: 20180525 |
    2018-10-10| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-27| PLFP| Fee payment|Year of fee payment: 5 |
    2020-09-25| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-09| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014240408A|JP6691348B2|2014-11-27|2014-11-27|Lighting circuit and lighting system|
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