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公开(公告)号：EP4064793A1
公开(公告)日：2022-09-28
申请号：EP22172368.7
申请日：2018-11-09
发明人： ICHIKAWA, Tomoyuki , MATSUHANA, Ryosuke , KIKUCHI, Satoshi , KAWABATA, Naoki , TAKAHASHI, Norito
IPC分类号： H05B45/10 , H05B45/46 , H05B45/375 , H05B45/347
摘要： A lighting circuit structured to turn on a plurality of semiconductor light sources is proposed, the lighting circuit comprising a plurality of current sources each of which is to be coupled to a corresponding semiconductor light source in series; a switching converter structured to supply a driving voltage across each of a plurality of series connection circuits each formed of the semiconductor light source and the current source; and a converter controller employing a ripple control method, wherein the plurality of current sources each comprise: a series transistor and a sensing resistor arranged in series with a corresponding semiconductor light source; and an error amplifier structured to adjust a voltage at a control electrode of the series transistor based on a voltage drop across the sensing resistor, and wherein the converter controller is structured to turn on the switching transistor of the switching converter in response to an output voltage of the error amplifier included in any one of the plurality of current sources satisfying a predetermined turn-on condition.
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公开(公告)号：EP3934385A1
公开(公告)日：2022-01-05
申请号：EP21186111.7
申请日：2018-11-09
发明人： ICHIKAWA, Tomoyuki , MATSUHANA, Ryosuke , KIKUCHI, Satoshi , KAWABATA, Naoki , TAKAHASHI, Norito
IPC分类号： H05B45/10 , H05B45/46 , H05B45/375 , H05B45/347
摘要： A current driver circuit is proposed, structured to drive a plurality of semiconductor light sources, the current driver circuit comprising: a plurality of current sources each structured to allow an on/off state thereof to be controlled independently according to a PWM signal, and to each be coupled to a corresponding semiconductor light source in series; an interface circuit structured to receive, from an external processor at a first time interval T 1 , a plurality of control data that indicates an on/off duty cycle for the plurality of current sources; and a dimming pulse generator structured to generate a plurality of PWM signals for the plurality of current sources, and to gradually change, at a second time interval T 2 that is shorter than the first time interval T 1 , a duty cycle of each of the plurality of PWM signals from a value indicated by the corresponding control data before updating to a value indicated by the corresponding control data after updating, wherein, with T 1 / T 2 = a, and with the difference in the value between the control data after updating and the control data before updating as ΔX, the dimming pulse generator changes the duty cycle at the second time interval T 2 in a stepwise manner in steps of ΔY = ΔX/a.
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公开(公告)号：EP3426009A1
公开(公告)日：2019-01-09
申请号：EP17759788.7
申请日：2017-02-23
摘要： A current detection circuit 34 generates a current detection signal V CS that corresponds to a lamp current I LAMP supplied from a switching converter 30 to a semiconductor light source 10. A hysteresis comparator 36 compares a current detection signal V CS with an upper-side threshold signal V THH and a lower-side threshold signal V THL determined according to an analog dimming signal V ADIM , and generates a control pulse S CNT that corresponds to the comparison result. A driver 38 drives a switching transistor M1 according to the control pulse S CNT . A PWM dimming circuit 90 generates a gradual change signal by dulling a PWM (pulse width modulation) dimming signal S PWM and changes the analog dimming signal V ADIM based on the gradual change signal
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公开(公告)号：EP4122766A1
公开(公告)日：2023-01-25
申请号：EP21771555.6
申请日：2021-03-10
摘要： There is provided a rear sign lamp capable of enhancing safety. An LED string (502) includes four LEDs (504_1 to 504_4) connected in series. An LED driver circuit (610) receives a battery voltage (VIN) and supplies a drive current (ILED) stabilized at a target current (IREF) to the LED string (502). A bypass circuit (620) is provided in parallel with a bypassed portion (503) including two adjacent LEDs (504_3 and 504_4) of the LED string (502), and sinks a bypass current (IBYPASS) according to a battery voltage (VIN).
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公开(公告)号：EP3471252A1
公开(公告)日：2019-04-17
申请号：EP17813215.5
申请日：2017-06-08
摘要： A load driving apparatus 100 receives an input voltage from a power supply 202, and supplies electric power to a load 200 under processor control. The processor 204 outputs first and second signals Sig1 and Sig2 via first and second pins P 1 and P 2 in a conjunction such that they are negated when the load 200 is instructed to suspend operation. An output circuit 110 supplies electric power to the load 200. A protection switch M2 is provided on a driving path that extends from the power supply 202 to the load 200 and returns to the power supply 202. When the first signal Sig1 is asserted (negated), a control circuit 130 sets the output circuit 110 to an operation state (suspension state). The control circuit 130 turns on the protection switch M2 on assertion of the second signal Sig2, and turns it off on negation of this signal.
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公开(公告)号：EP2957818A1
公开(公告)日：2015-12-23
申请号：EP14751006.9
申请日：2014-02-03
IPC分类号： F21S8/10 , F21W101/10 , F21Y101/02
摘要： A vehicle light fitting (1) according to an embodiment of the present invention is provided with: a light source (130); a light-emission member (150) which receives light from the light source (130) and emits said light; and a support member (110) for supporting the light-emission member (150). The support member (110) includes a light-emission-member accommodation part (114) which is translucent. The light-emission-member accommodation part (114) is provided with a recessed part (116) in which the light-emission member (150) is accommodated. In a state in which the light-emission member (150) is accommodated in the recessed part (116), a light-entrance surface (150a) and side surfaces of the light-emission member (150) are in contact with the light-emission-member accommodation part (114).
摘要翻译： 根据本发明实施例的车辆灯具（1）设置有：光源（130）; 发光部件（150），其从所述光源（130）接收光并发射所述光; 以及用于支撑发光构件（150）的支撑构件（110）。 支撑构件（110）包括透光的发光构件容纳部（114）。 发光部件容置部（114）设置有容纳有发光部件（150）的凹部（116）。 在发光部件（150）容纳在凹部（116）中的状态下，发光部件（150）的光入射面（150a）和侧面与发光部件（150） 排放构件容纳部（114）。
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公开(公告)号：EP3738830A1
公开(公告)日：2020-11-18
申请号：EP19738824.2
申请日：2019-01-09
发明人： KIKUCHI, Satoshi , MURAKAMI, Kentarou , TSUCHIYA, Toshiyuki , MURAMATSU, Takao , YANAGIZU, Shohei , ICHIKAWA, Tomoyuki
摘要： A scanning light source 10 includes a light source 110, and scans the output light of the light source 110 ahead of a lamp. A control apparatus 200 controls the lighting on/off state of the semiconductor light source in synchronization with the scanning operation of the scanning light source 10. The control apparatus 200 judges the presence or absence of an abnormal state with at least one from among (i) a timing immediately before switching from a lighting-on state to a lighting-off state and (ii) a timing immediately before switching from a lighting-off state to a lighting-on state as a judgment timing.
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公开(公告)号：EP3434518A3
公开(公告)日：2019-03-06
申请号：EP18191789.9
申请日：2015-02-23
发明人： ICHIKAWA, Tomoyuki , TSUDA, Toshiaki , SATO, Noriko , MIZUNO, Masanobu , KUBOYAMA, Osamu , MASUDA, Takeshi
IPC分类号： B60Q1/00 , B60Q1/04 , B60Q1/50 , F21W111/00 , F21Y101/00 , F21S41/14 , F21S43/14 , F21S41/36 , F21S41/16 , F21S41/143 , F21Y113/10 , F21Y113/13 , F21W103/55 , F21W103/60 , F21W103/15
摘要： The present invention relates to a vehicle lamp comprising: a daytime running lamp or a clearance lamp that forms a light emission area by using multiple white LED light sources; and a laser light source that is able to emit laser light in color other than white, wherein in the vehicle lamp in which the laser light is emitted forward from an emission end, the emission end is disposed so as to be superimposed within the light emission area.
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公开(公告)号：EP4329432A1
公开(公告)日：2024-02-28
申请号：EP22791799.4
申请日：2022-04-21
发明人： ICHIKAWA, Tomoyuki
IPC分类号： H05B45/40 , B60Q1/04 , F21S41/663 , H05B45/10 , H05B45/345 , H05B45/3725 , F21W102/155 , F21Y115/10
摘要： When a power supply voltage V IN is supplied to an input terminal V IN , a first constant current driver 210 supplies a first driving current I OUT1 to the anode of a first semiconductor light source 101. A first switch SW1 is provided between the first semiconductor light source 101 and a second semiconductor light source 102, and a second switch SW2 between the first semiconductor light source 101 and a third semiconductor light source 103. When a switching terminal SEL has a high impedance or low level, a switching circuit 220 turns the first switch SW1 on and the second switch SW2 off. When a switching voltage V SEL is supplied to the switching terminal SEL, the switching circuit 220 turns the first switch off and the second switch SW2 on, and supplies a second driving voltage I OUT2 smaller than the first driving current I OUT1 to the second semiconductor light source 102.
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