WO2017150322A1 - 車両用灯具およびその点灯回路 - Google Patents
車両用灯具およびその点灯回路 Download PDFInfo
- Publication number
- WO2017150322A1 WO2017150322A1 PCT/JP2017/006743 JP2017006743W WO2017150322A1 WO 2017150322 A1 WO2017150322 A1 WO 2017150322A1 JP 2017006743 W JP2017006743 W JP 2017006743W WO 2017150322 A1 WO2017150322 A1 WO 2017150322A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- frequency
- switching
- lamp
- circuit
- Prior art date
Links
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 239000004065 semiconductor Substances 0.000 claims abstract description 28
- 230000008859 change Effects 0.000 claims description 15
- 238000013459 approach Methods 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 2
- 238000010374 somatic cell nuclear transfer Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 24
- 239000003990 capacitor Substances 0.000 description 12
- 230000000737 periodic effect Effects 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004313 glare Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012538 light obscuration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1415—Dimming circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- the present invention relates to a vehicular lamp used in an automobile or the like.
- ⁇ ⁇ Vehicle lamps can generally switch between low beam and high beam.
- the low beam illuminates the neighborhood with a predetermined illuminance, and the light distribution regulation is determined so as not to give glare to the oncoming vehicle and the preceding vehicle, and is mainly used when traveling in an urban area.
- the high beam illuminates a wide area in the front and a distant area with a relatively high illuminance, and is mainly used when traveling at high speed on a road with few oncoming vehicles and preceding vehicles. Therefore, although the high beam is more visible to the driver than the low beam, there is a problem that glare is given to the driver or pedestrian of the vehicle existing in front of the vehicle.
- ADB Adaptive Driving Beam
- ADB technology detects the presence of preceding vehicles, oncoming vehicles, and pedestrians in front of the vehicle, and reduces glare given to the vehicle or pedestrian by dimming or turning off the area corresponding to the vehicle or pedestrian. Is.
- FIG. 1 is a block diagram of a hysteresis-controlled vehicle lamp studied by the present inventors. This comparison technique should not be recognized as a known technique.
- the vehicular lamp 1r includes a semiconductor light source 10 and a lighting circuit 20r.
- the semiconductor light source 10 includes a semiconductor device such as an LED (light emitting diode) or an LD (laser diode).
- Lighting circuit 20r includes a switching converter 30r and a converter controller 32r.
- the switching converter 30 r receives a battery voltage V BAT (also referred to as an input voltage VIN ) from the battery 2 via the switch 4 and supplies a lamp current (drive current) I LAMP to the semiconductor light source 10.
- V BAT also referred to as an input voltage VIN
- the switching converter 30r is a step-down converter (Buck converter), and includes an input capacitor C1, a switching transistor M1, a diode D1, and an inductor L1.
- Converter controller 32r detects a lamp current I LAMP, the lamp current I LAMP is to match the target current I REF corresponding to the target light amount of the semiconductor light source 10 to adjust the duty ratio of the switching of the switching transistor M1.
- the converter controller 32r is a hysteresis control type controller, and includes a current detection circuit 34, a hysteresis comparator 36, and a driver 38.
- a current detection resistor hereinafter, referred to a sense resistor
- R CS On the path of the lamp current I LAMP, a current detection resistor (hereinafter, referred to a sense resistor) R CS is inserted.
- the sense resistor R CS a voltage drop proportional to the lamp current I LAMP is generated.
- the current detection circuit 34 generates a current detection signal V CS indicating the current lamp current I LAMP based on the voltage drop of the sense resistor R CS .
- Hysteresis comparator 36 two threshold signal V THL determined according to the current detection signal V CS reference voltage V REF, compared with V THH, generates control pulses S CNT according to the comparison result. Specifically, the control pulse S CNT transitions to the first level when the current detection signal V CS reaches the upper threshold signal V THH corresponding to the peak value I PEAK of the lamp current I LAMP , and the current detection signal V CS When CS reaches the lower threshold value signal V THL corresponding to the bottom value I BOTTOM of the lamp current I LAMP , the transition is made to the second level.
- the driver 38 drives the switching transistor M1 based on the control pulse SCNT .
- the lamp current I LAMP reciprocates between the peak value I PEAK and the bottom value I BOTTOM . Therefore, the semiconductor light source 10 has the peak value I PEAK and the bottom value I BOTTOM (two threshold signals V THH and V THL. ) At a luminance corresponding to the average value I REF .
- the present inventors examined performing PWM dimming (PWM dimming) in the above-described hysteresis-controlled lighting circuit. That is, a PWM dimming pulse S PWM having a frequency lower than the frequency of the control pulse S CNT is generated, and the switching transistor M1 is switched during a lighting period in which the PWM dimming pulse S PWM is at the first level (for example, high level) During the turn-off period of the second level (for example, low level), the switching transistor M1 is turned off.
- the duty ratio of the PWM dimming pulse S PWM the effective luminance of the semiconductor light source 10 can be changed.
- FIG. 2 is a diagram for explaining PWM dimming in the vehicular lamp 1r of FIG. Note that the vertical axis and horizontal axis of the waveform diagrams and time charts referred to in this specification are appropriately expanded or reduced for easy understanding, and each waveform shown is also simplified for easy understanding. Or exaggerated or emphasized.
- the switching transistor M1 When the PWM dimming pulse S PWM transitions to a high level and enters the lighting period, the switching transistor M1 is turned on. Then, when the lamp current I LAMP increases with a slope of (V IN ⁇ V OUT ) / L and reaches the upper limit I PEAK , the switching transistor M1 is turned off. Thereafter, during the lighting period, the lamp current I LAMP reciprocates between the peak value I PEAK and the bottom value I BOTTOM .
- the lamp current I LAMP changes very rapidly when switching between the lighting period and the extinguishing period. This is one of the advantages of hysteresis control.
- a sharp change in the lamp current I LAMP when switching between the lighting period and the extinguishing period can cause electromagnetic noise.
- the present invention has been made in view of these problems, and one of exemplary purposes of an aspect thereof is to provide a vehicular lamp capable of suppressing electromagnetic noise and a lighting circuit thereof.
- An embodiment of the present invention relates to a lighting circuit used for a vehicular lamp.
- the lighting circuit includes a switching converter that supplies power to a semiconductor light source provided in the vehicular lamp, and a converter controller that controls the switching converter.
- the converter controller compares the current detection signal according to the drive current supplied from the switching converter to the semiconductor light source with the upper threshold signal and the lower threshold signal determined according to the reference signal, and according to the comparison result Based on the gradual change signal, a hysteresis comparator that generates a control pulse, a driver that drives the switching transistor of the switching converter in response to the control pulse, and a PWM (pulse width modulation) dimming signal are smoothed. And a PWM dimming circuit for changing the reference signal.
- electromagnetic noise accompanying PWM dimming can be suppressed by gently changing the envelope of the lamp current.
- the PWM dimming circuit may include a low-pass filter (integrating circuit) that receives the PWM dimming signal and generates a gradually changing signal. Thereby, the amount of electromagnetic noise and the linearity of PWM dimming can be adjusted according to the cut-off frequency (time constant) of the low-pass filter.
- a low-pass filter integrating circuit
- the hysteresis comparator compares the current detection signal with a threshold voltage, generates a control pulse, a first resistor, a transistor, and a second connected in series between a line where the analog dimming signal is generated and the ground And a selector that receives the resistor, the first voltage generated at the connection point of the first resistor and the transistor, and the second voltage generated at the connection point of the transistor and the second resistor, and outputs one corresponding to the control pulse.
- the threshold voltage may depend on the output voltage of the selector.
- a lighting circuit of an aspect includes a frequency detection circuit that generates a frequency detection signal indicating a frequency of a control pulse, and a potential difference between the upper threshold signal and the lower threshold signal so that the frequency detection signal approaches a reference value. And a threshold voltage adjusting circuit to be changed. According to this aspect, the switching frequency can be stabilized at a frequency according to the reference value regardless of variations in the input voltage, output voltage, and inductance.
- the lighting circuit of an aspect further includes a modulator that generates a modulation signal having a frequency lower than a switching frequency of the switching transistor and modulates a difference between the upper threshold signal and the lower threshold signal in accordance with the modulation signal. Also good. According to this aspect, it is possible to spread the spectrum of the switching frequency, thereby suppressing occurrence of beat noise and the like.
- the vehicular lamp includes a semiconductor light source and any one of the lighting circuits described above for lighting the semiconductor light source.
- electromagnetic noise can be suppressed.
- FIG. 4 is an operation waveform diagram of the lighting circuit of FIG. 3.
- FIG. 4 is a circuit diagram illustrating a configuration example of a part of the lighting circuit of FIG. 3. It is a block diagram of the vehicular lamp which concerns on 2nd Embodiment. It is a circuit diagram which shows the structural example of the lighting circuit of FIG. It is a block diagram of the vehicular lamp which concerns on 3rd Embodiment. It is a circuit diagram which shows the structural example of a modulator.
- FIG. 1 is a perspective view schematically showing a blade scanning vehicle lamp having an ADB function.
- the state in which the member A is connected to the member B means that the member A and the member B are electrically connected to each other in addition to the case where the member A and the member B are physically directly connected. It includes cases where the connection is indirectly made through other members that do not substantially affect the general connection state, or that do not impair the functions and effects achieved by their combination.
- the state in which the member C is provided between the member A and the member B refers to the case where the member A and the member C or the member B and the member C are directly connected, as well as their electric It includes cases where the connection is indirectly made through other members that do not substantially affect the general connection state, or that do not impair the functions and effects achieved by their combination.
- electrical signals such as voltage signals and current signals, or symbols attached to circuit elements such as resistors and capacitors indicate the respective voltage values, current values, resistance values, and capacitance values as necessary. It shall represent.
- FIG. 3 is a block diagram of the vehicular lamp 1 according to the first embodiment.
- the vehicular lamp 1 includes a semiconductor light source 10 and a lighting circuit 20.
- the semiconductor light source 10 include, but are not limited to, LEDs, LDs, and organic ELs (electroluminescence).
- the lighting circuit 20 includes a switching converter 30 and a converter controller 32. As in FIG. 1, the switching converter 30 is a step-down converter, and the converter controller 32 stabilizes the lamp current I LAMP supplied from the switching converter 30 to the semiconductor light source 10 to a predetermined target current I REF .
- the converter controller 32 includes a current detection circuit 34, a hysteresis comparator 36, a driver 38, and a PWM dimming circuit 90.
- the current detection circuit 34 generates a current detection signal V CS corresponding to the lamp current I LAMP supplied from the switching converter 30 to the semiconductor light source 10.
- the sense resistor R CS may be inserted on the path of the lamp current I LAMP , and the current detection signal V CS may be generated by amplifying the voltage drop of the sense resistor R CS by the current detection circuit 34.
- the hysteresis comparator 36 compares the current detection signal V CS with the upper threshold signal V THH and the lower threshold signal V THL and generates a control pulse S CNT according to the comparison result.
- the upper threshold signal V THH and the lower threshold signal V THL are defined according to the analog dimming signal V ADIM .
- the driver 38 drives the switching transistor M1 of the switching converter 30 according to the control pulse SCNT .
- the high level of the control pulse SCNT corresponds to the on state of the switching transistor M1
- the low level corresponds to the off state of the switching transistor M1.
- a PWM dimming signal S PWM is input to the lighting circuit 20.
- the PWM dimming signal S PWM has a frequency of about several tens of Hz to several hundreds of Hz, and its duty ratio changes according to the target luminance of the semiconductor light source 10.
- PWM dimming circuit 90 is blunted the PWM dimming signal S PWM to generate a gradual change signal S SOFT, changing the analog dimming signal V ADIM based on the gradual change signal S SOFT.
- FIG. 4 is an operation waveform diagram of the lighting circuit 20 of FIG.
- the analog dimming signal V ADIM has a waveform corresponding to the gradual change signal obtained by smoothing the PWM dimming signal S PWM .
- the upper threshold signal V THH and the lower threshold signal V THL in the hysteresis comparator 36 become the analog dimming signal V ADIM. It increases moderately according to. Therefore, the envelope of the current detection signal V CS and hence the lamp current I LAMP gradually increases according to the analog dimming signal V ADIM .
- the upper threshold signal V THH and the lower threshold signal V THL in the hysteresis comparator 36 are analog dimming signals. Decrease gradually according to V ADIM . Therefore, the envelope of the current detection signal V CS and hence the lamp current I LAMP gradually decreases according to the analog dimming signal V ADIM .
- FIG. 4 shows the waveform of the lamp current I LAMP ′ in FIG.
- the lamp current I LAMP immediately increases to the vicinity of the target current I REF , and the steep current change at this time causes electromagnetic noise.
- the lamp current I LAMP has the same slope as I LAMP ′, but the amount of change per switching becomes small, so that electromagnetic noise can be suppressed.
- the present invention is understood as the block diagram and circuit diagram of FIG. 3 or extends to various devices and circuits derived from the above description, and is not limited to a specific configuration.
- more specific configuration examples will be described in order not to narrow the scope of the present invention but to help understanding and clarify the essence and circuit operation of the present invention.
- FIG. 5 is a circuit diagram showing a configuration example of a part of the lighting circuit 20 of FIG.
- the PWM dimming circuit 90 includes a low-pass filter 92 and a buffer 94.
- the low-pass filter 92 is, for example, a first-order RC filter, and includes a resistor R51 and a capacitor C51.
- the output signal of the low-pass filter 92 corresponds to the above-described gradual change signal.
- the buffer 94 receives the gradual change signal and outputs it as an analog dimming signal V ADIM . Instead of the buffer 94, a non-inverting amplifier may be used.
- the analog dimming signal V ADIM is made too gentle, the electromagnetic noise is reduced, but the linearity of the duty ratio versus the light intensity deteriorates in a region where the duty ratio of the PWM dimming signal S PWM is small. Conversely, if the analog dimming signal V ADIM is made too steep, the linearity of the duty ratio versus the light intensity is improved, but electromagnetic noise increases. According to the PWM dimming circuit 90 of FIG. 5, the balance between the electromagnetic noise reduction effect and the PWM dimming linearity can be set based on the cutoff frequency of the low-pass filter 92.
- the hysteresis comparator 36 includes a comparator COMP1, a first resistor R21, a second resistor R22, a first transistor M21, a selector 37, and resistors R61 to R63.
- the comparator COMP1 is a current detection signal V CS compared with the threshold voltage V TH, and generates a control pulse S CNT.
- the first resistor R21, the first transistor M21, and the second resistor R22 are sequentially provided in series between the line 96 where the analog dimming signal V ADIM is generated and the ground.
- the gate of the first transistor M21 is appropriately biased.
- an operational amplifier OA1 is provided for biasing the first transistor M21.
- the output of the operational amplifier OA1 is connected to the gate of the first transistor M21, the non-inverting input terminal is connected to the connection point of the transistor M21 and the second resistor R22, and a certain voltage V X is input to the inverting input terminal.
- the two voltages V H and V L are expressed by the following equations.
- V H V ADIM ⁇ Ix ⁇ R21 (1a)
- V L Ix ⁇ R22 (1b)
- V H V ADIM ⁇ Ix ⁇ R (2a)
- V L Ix ⁇ R (2b) It becomes.
- the selector 37 receives the first voltage V H generated at the connection point of the first resistor R21 and the first transistor M21, and the second voltage VL generated at the connection point of the first transistor M21 and the second resistor R22, and receives a control pulse. outputs one corresponding to the S CNT.
- the threshold voltage V TH given to the comparator COMP1 is in accordance with the output voltage V Y of the selector 37.
- the threshold voltage V TH may be generated by averaging the voltage V Y and the analog dimming signal V ADIM with the resistors R 61 to R 63.
- a voltage V Y may directly be the threshold voltage V TH.
- FIG. 6 is a block diagram of the vehicular lamp 1a according to the second embodiment.
- the converter controller 32a of FIG. 6 further includes a frequency detection circuit 40 and a threshold voltage adjustment circuit 42 in addition to the converter controller 32 of FIG.
- the frequency detection circuit 40 generates a frequency detection signal V FREQ indicating the frequency of the control pulse SCNT , that is, the switching frequency of the switching transistor M1.
- the switching frequency can be stabilized at a frequency corresponding to the reference value V REF regardless of variations in the input voltage VIN , the output voltage V OUT , and the inductance L1.
- FIG. 7 is a circuit diagram showing a configuration example of the lighting circuit 20a of FIG.
- FIG. 7 shows a part of the frequency detection circuit 40, the threshold voltage adjustment circuit 42, and the hysteresis comparator 36.
- the frequency detection circuit 40 can be understood as an F / V conversion circuit.
- the frequency detection circuit 40 includes a high-pass filter 52, a first capacitor C11, a second transistor M12, a charging circuit 54, and a peak hold circuit 56.
- the high pass filter 52 receives the control pulse SCNT or the gate pulse of the switching transistor M1.
- the high-pass filter 52 can also be grasped as a differentiation circuit.
- One end of the first capacitor C11 is grounded.
- the charging circuit 54 charges the first capacitor C11.
- the charging circuit 54 is configured by a current source or a resistor.
- the second transistor M12 is connected in parallel with the first capacitor C11, and discharges the first capacitor C11 when the output signal of the high-pass filter 52 exceeds the gate-source threshold voltage.
- a first periodic signal S11 having a ramp waveform is generated in the first capacitor C11.
- the frequency detection circuit 40 outputs a frequency detection signal V FREQ corresponding to the amplitude of the first periodic signal S11.
- the peak hold circuit 56 receives the first periodic signal S11 and outputs a frequency detection signal V FREQ indicating the peak value.
- the configuration of the frequency detection circuit 40 is not particularly limited.
- the threshold voltage adjustment circuit 42 changes the voltage V X so that the frequency detection signal V FREQ approaches the reference value V REF .
- the threshold voltage adjustment circuit 42 may generate the voltage V X based on the error between the frequency detection signal V FREQ and the reference value V REF .
- the threshold voltage adjustment circuit 42 may include a voltage comparator that compares the frequency detection signal V FREQ with the reference value V REF and a low-pass filter that smoothes the output pulse of the voltage comparator.
- the threshold voltage adjustment circuit 42 may include an error amplifier that amplifies an error between the frequency detection signal V FREQ and the reference value V REF .
- V FREQ > V REF and the voltage V X increases.
- the potential difference between the upper voltage V H and the lower voltage VL is reduced, and feedback is applied in the direction in which the switching frequency increases, that is, in the direction closer to the target frequency.
- the switching frequency can be stabilized at the target frequency.
- Frequency feedback control is effective not only for fluctuations in the input voltage VIN but also for all fluctuations and fluctuations that change the switching frequency, such as fluctuations in the output voltage VOUT , fluctuations in the inductance of the inductor L1, and temperature fluctuations. And since the unexpected fluctuation
- the average level of the upper threshold signal V THH and the lower threshold signal V THL depends only on the analog dimming signal V ADIM and does not depend on the hysteresis width Vx. Therefore, the average value of the lamp current I LAMP can be kept constant while changing the hysteresis width ⁇ V, and the flickering of the semiconductor light source 10 can be prevented.
- FIG. 8 is a block diagram of the vehicular lamp 1b according to the third embodiment.
- the converter controller 32b of FIG. 6 further includes a modulator 60 in addition to the converter controller 32a of FIG.
- the modulator 60 generates a modulation signal V MOD having a frequency lower than the switching frequency of the switching transistor M1, and the difference (hysteresis) between the upper threshold signal V THH and the lower threshold signal V THL according to the modulation signal V MOD. Width).
- the modulator 60 may superimpose the modulation signal V MOD on the reference value V REF input to the threshold voltage adjustment circuit 42.
- FIG. 9 is a circuit diagram illustrating a configuration example of the modulator 60.
- the modulator 60 includes an oscillator 62 that generates a modulation signal V MOD whose frequency is sufficiently lower than the switching frequency, and changes the reference value V REF according to the modulation signal V MOD .
- the oscillator 62 includes resistors R91 to R94, a capacitor C91, and an operational amplifier OA91.
- the waveform of the modulation signal V MOD is not particularly limited, and may be any one of a sawtooth wave, a ramp wave, a sine wave, and a trapezoidal wave. From another point of view, it may be a periodic signal having a slope.
- the modulation signal V MOD and the power supply voltage V CC are added and averaged (weighted addition) by the resistors R95 to R97, and a reference value V REF on which the modulation signal V MOD is superimposed is generated.
- feedback control is performed so that the actual switching frequency approaches the target frequency while slowly changing the target frequency of the switching frequency in accordance with the modulation signal V MOD , so that the input voltage V
- the spectrum of the switching frequency can be spread while eliminating the influence of fluctuations in IN and output voltage VOUT , inductance fluctuations, temperature fluctuations, and the like. Thereby, generation
- the function required of the modulator 60 is to modulate the difference ⁇ V between the upper threshold signal V THH and the lower threshold signal V THL according to the modulation signal V MOD. is there. Therefore, the modulator 60 may superimpose the modulation signal V MOD on the frequency detection signal V FREQ instead of the reference value V REF .
- FIG. 10 is a block diagram of a vehicular lamp 1c according to the fourth embodiment.
- the converter controller 32c of FIG. 10 includes a modulator 70 in addition to the converter controller 32 of FIG.
- the modulator 70 generates a modulation signal V MOD having a frequency lower than the switching frequency of the switching transistor M1, and modulates the hysteresis width ⁇ V according to the modulation signal V MOD .
- the modulator 70 may be configured similarly to the modulator 60 of FIG.
- a hysteresis comparator 36 if the configuration of FIG 5, a bias state, that current Ix of the transistor M21, may be modulated based on a modulation signal V MOD.
- V MOD the potential difference between the voltages V H and V L , that is, the hysteresis width ⁇ V is given by Equation (4). Therefore, by superimposing the modulation signal V MOD on the voltage Vx, the hysteresis width ⁇ V can be modulated and the spectrum can be spread.
- the PWM dimming circuit 90, the frequency detection circuit 40, the threshold voltage adjustment circuit 42, the modulator 70, etc. are composed of analog circuits, but some or all of them are digital circuits. It may be configured. Furthermore, the entire converter controller 32 may be configured based on a digital circuit. In this case, an A / D converter that converts the output signal of the current detection circuit 34 into a digital value may be added, and the hysteresis comparator 36 may be a digital comparator.
- the switching converter 30 may be a step-up converter, a step-up / step-down converter, a converter using a transformer, or another converter such as a Cuk converter.
- FIG. 11 is a block diagram of an array-type vehicular lamp 1 having an ADB function.
- ADB the high beam irradiation area is divided into a plurality of N (N is a natural number of 2 or more) sub-areas.
- the semiconductor light source 10 includes a plurality of light emitting elements 12_1 to 12_N associated with N sub-regions.
- Each light emitting element 12 is a semiconductor device such as an LED (light emitting diode) or LD (laser diode), and is arranged so as to irradiate a corresponding sub-region.
- the lighting circuit 20 changes the light distribution of the high beam by controlling on (lighting) and off (light extinction) of each of the plurality of light emitting elements 12_1 to 12_N. Alternatively, the lighting circuit 20 adjusts the effective luminance by PWM (pulse width modulation) control of the light emitting element 12 at a high frequency.
- PWM pulse width modulation
- the lighting circuit 20 includes a plurality of bypass circuits 80_1 to 80_N and a controller 82 in addition to the switching converter 30 and a converter controller 32 (not shown).
- the plurality of bypass circuits 80_1 to 80_N are associated with the plurality of light emitting elements 12_1 to 12_N.
- the bypass circuit 80 is configured to be switched on and off. When the i-th bypass circuit 80_i is turned on, the lamp current I LAMP flows to the bypass circuit 80_i instead of the light emitting element 12_i. When the light emitting element 12_i is turned off and the bypass circuit 80_i is turned off, the lamp current I LAMP is Lights through the light emitting element 12_i.
- the upstream processor (for example, the electronic control unit ECU) 6 that controls the vehicular lamp 1 determines a sub-region to be irradiated by the high beam based on the state in front of the vehicle, and instructs the controller 82 of the lighting circuit 20.
- the controller 82 controls the states of the bypass circuits 80_1 to 80_N based on the control command from the processor 6. Specifically, the light emitting element 12 corresponding to the sub-region to be irradiated is selected, the bypass circuit 80 in parallel with the selected light emitting element 12 is turned off, and the bypass circuit 80 in parallel with the remaining light emitting elements 12 is turned on. State.
- FIG. 12 is a perspective view schematically showing a blade scanning type vehicle lamp 1 having an ADB function.
- the vehicular lamp 1 mainly includes a scanning light source 11, a projection lens 120, and a lighting circuit 20.
- the scanning light source 11 includes a blade (reflecting mirror) 100 and a light source 10. Although a plurality of light sources 10 may be provided, the case of one light source 10 will be described here for ease of understanding and simplification of explanation.
- the light source 10 is a semiconductor light source using an LED (light emitting diode) or a laser diode.
- the blade 100 receives the emitted light L1 from the light source 10, and scans the reflected light L2 in the lateral direction (Y direction in the figure) in front of the vehicle by repeating a predetermined periodic motion.
- the blade 100 is attached to a motor (not shown) and performs a rotational motion.
- the emitted light L1 of the blade 100 is reflected at a reflection angle corresponding to the position of the blade 100 (rotation angle of the rotor), and an irradiation region 300 is formed.
- a light distribution pattern 310 is formed in front of the vehicle.
- the lighting circuit 20 controls the light amount (luminance) of the light source 10 in synchronization with the periodic motion of the blade 100 so that a desired light distribution pattern is obtained.
- a range (region) in which the irradiation region 300 is irradiated is referred to as a lighting region R ON
- a range (region) in which the irradiation region 300 is not irradiated is referred to as a light-off region R OFF .
- the light distribution pattern 310 is a combination of the lighting region R ON and the extinguishing region R OFF .
- the configuration of the scanning light source 11 is not limited to that shown in FIG.
- a polygon mirror or a galvanometer mirror may be used, or a MEMS (Micro Electro Mechanical Systems) scan mirror may be used.
- an actuator may be provided instead of the motor, and the direction of the blade 100 may be changed.
- the blade 100 may be fixed or omitted, and the optical axis of the semiconductor light source 10 may be moved by an actuator.
- an electro-optical element may be used instead of the blade 100.
- the electro-optic element may be a lens whose refractive index can be controlled by voltage, current, temperature, or the like. The light may be scanned by periodically changing the refractive index of the lens.
- the present invention can be used for lighting and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
この態様によると、入力電圧や出力電圧、インダクタンスの変動にかかわらず、スイッチング周波数を基準値に応じた周波数に安定化することができる。
この態様によると、スイッチング周波数のスペクトルを拡散させることができ、これにより、ビートノイズなどの発生を抑制できる。
同様に、「部材Cが、部材Aと部材Bの間に設けられた状態」とは、部材Aと部材C、あるいは部材Bと部材Cが直接的に接続される場合のほか、それらの電気的な接続状態に実質的な影響を及ぼさない、あるいはそれらの結合により奏される機能や効果を損なわせない、その他の部材を介して間接的に接続される場合も含む。
図3は、第1の実施の形態に係る車両用灯具1のブロック図である。車両用灯具1は、半導体光源10および点灯回路20を備える。半導体光源10は、LEDやLD、有機EL(エレクトロルミネッセンス)などが例示されるが、特に限定されない。点灯回路20は、スイッチングコンバータ30およびコンバータコントローラ32を備える。図1と同様にスイッチングコンバータ30は降圧コンバータであり、コンバータコントローラ32は、スイッチングコンバータ30から半導体光源10に供給されるランプ電流ILAMPを、所定の目標電流IREFに安定化する。
VH=VADIM-Ix×R21 …(1a)
VL=Ix×R22 …(1b)
R21=R22=Rとすれば、
VH=VADIM-Ix×R …(2a)
VL=Ix×R …(2b)
となる。またそれらの平均電圧は、式(3)で与えられる。
(VH+VL)/2=VADIM/2 …(3)
つまり、ランプ電流ILAMPの平均値(IREF)をアナログ調光電圧VADIMにもとづいて制御することができる。
図6は、第2の実施の形態に係る車両用灯具1aのブロック図である。図6のコンバータコントローラ32aは、図3のコンバータコントローラ32に加えて、周波数検出回路40およびしきい値電圧調節回路42をさらに備える。
VH-VL=VADIM-2×Ix×R=VADIM-2×VX …(4)
したがって、電圧VXを変化させることにより、電位差VH-VLを変化が変化し、ひいてはヒステリシス幅ΔVを変化させることができる。
図8は、第3の実施の形態に係る車両用灯具1bのブロック図である。図6のコンバータコントローラ32bは、図6のコンバータコントローラ32aに加えて、変調器60をさらに備える。変調器60は、スイッチングトランジスタM1のスイッチング周波数より低い周波数の変調信号VMODを生成し、変調信号VMODに応じて上側しきい値信号VTHHおよび下側しきい値信号VTHLの差分(ヒステリシス幅)を変調する。たとえば変調器60は、しきい値電圧調節回路42に入力される基準値VREFに変調信号VMODを重畳してもよい。
図10は、第4の実施の形態に係る車両用灯具1cのブロック図である。図10のコンバータコントローラ32cは、図3のコンバータコントローラ32に加えて変調器70を備える。変調器70は、スイッチングトランジスタM1のスイッチング周波数よりも低い周波数の変調信号VMODを生成し、変調信号VMODに応じてヒステリシス幅ΔVを変調する。変調器70は、図9の変調器60と同様に構成してもよい。
続いて、いくつかの実施の形態において適用可能な変形例を説明する。
いくつかの実施の形態では、PWM調光回路90、周波数検出回路40、しきい値電圧調節回路42、変調器70、等をアナログ回路で構成したが、それらの一部あるいは全部をデジタル回路で構成してもよい。さらには、コンバータコントローラ32全体をデジタル回路をベースに構成してもよい。この場合、電流検出回路34の出力信号をデジタル値に変換するA/Dコンバータを追加し、ヒステリシスコンパレータ36をデジタルコンパレータとすればよい。
スイッチングコンバータ30は昇圧コンバータ、昇降圧コンバータであってもよいし、トランスを用いたコンバータであってもよいし、Cukコンバータなどその他のコンバータであってもよい。
図11は、ADB機能を有するアレイ方式の車両用灯具1のブロック図である。ADBにおいては、ハイビーム照射領域は、複数N個(Nは2以上の自然数)のサブ領域に分割される。半導体光源10は、N個のサブ領域に対応づけられる複数の発光素子12_1~12_Nを含む。各発光素子12は、LED(発光ダイオード)やLD(レーザダイオード)などの半導体デバイスであり、それぞれが対応するサブ領域を照射するよう配置される。点灯回路20は、複数の発光素子12_1~12_Nそれぞれのオン(点灯)、オフ(消灯)を制御することで、ハイビームの配光を変化させる。あるいは点灯回路20は、高い周波数で発光素子12をPWM(パルス幅変調)制御することで、実効的な輝度を調節する。
Claims (6)
- 半導体光源に電力を供給するスイッチングコンバータと、
前記スイッチングコンバータを制御するコンバータコントローラと、
を備え、
前記コンバータコントローラは、
前記スイッチングコンバータから前記半導体光源に供給されるランプ電流に応じた電流検出信号を、アナログ調光信号に応じて定まる上側しきい値信号および下側しきい値信号と比較し、比較結果に応じた制御パルスを生成するヒステリシスコンパレータと、
前記制御パルスに応じて前記スイッチングコンバータのスイッチングトランジスタを駆動するドライバと、
PWM(パルス幅変調)調光信号をなまらせて徐変信号を生成し、前記徐変信号にもとづいて前記アナログ調光信号を変化させるPWM調光回路と、
を備えることを特徴とする点灯回路。 - 前記PWM調光回路は、前記PWM調光信号を受け、前記徐変信号を生成するローパスフィルタを含むことを特徴とする請求項1に記載の点灯回路。
- 前記ヒステリシスコンパレータは、
前記電流検出信号をしきい値電圧と比較し、前記制御パルスを生成するコンパレータと、
前記アナログ調光信号が発生するラインと接地の間に順に直列に設けられる第1抵抗、トランジスタおよび第2抵抗と、
前記第1抵抗と前記トランジスタの接続点に生ずる第1電圧と、前記トランジスタと前記第2抵抗の接続点に生ずる第2電圧とを受け、前記制御パルスに応じた一方を出力するセレクタと、
含み、前記しきい値電圧は、前記セレクタの出力電圧に応じていることを特徴とする請求項1または2に記載の点灯回路。 - 前記制御パルスの周波数を示す周波数検出信号を生成する周波数検出回路と、
前記周波数検出信号が基準値に近づくように、前記上側しきい値信号および前記下側しきい値信号の電位差を変化させるしきい値電圧調節回路と、
をさらに備えることを特徴とする請求項1から3のいずれかに記載の点灯回路。 - 前記スイッチングトランジスタのスイッチング周波数より低い周波数の変調信号を生成し、前記変調信号に応じて前記上側しきい値信号および前記下側しきい値信号の差分を変調する変調器をさらに備えることを特徴とする請求項1から4のいずれかに記載の点灯回路。
- 半導体光源と、
前記半導体光源を点灯させる請求項1から5のいずれかに記載の点灯回路と、
を備えることを特徴とする車両用灯具。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018503083A JP6820909B2 (ja) | 2016-03-03 | 2017-02-23 | 車両用灯具およびその点灯回路 |
CN201780014894.1A CN108781495B (zh) | 2016-03-03 | 2017-02-23 | 车辆用灯具及其点亮电路 |
EP17759788.7A EP3426009A4 (en) | 2016-03-03 | 2017-02-23 | VEHICLE LIGHT AND LIGHTING CIRCUIT FOR THIS |
US16/117,962 US10710495B2 (en) | 2016-03-03 | 2018-08-30 | Automotive lamp |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016041377 | 2016-03-03 | ||
JP2016-041377 | 2016-03-03 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/117,962 Continuation US10710495B2 (en) | 2016-03-03 | 2018-08-30 | Automotive lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017150322A1 true WO2017150322A1 (ja) | 2017-09-08 |
Family
ID=59743879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2017/006743 WO2017150322A1 (ja) | 2016-03-03 | 2017-02-23 | 車両用灯具およびその点灯回路 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10710495B2 (ja) |
EP (1) | EP3426009A4 (ja) |
JP (1) | JP6820909B2 (ja) |
CN (1) | CN108781495B (ja) |
WO (1) | WO2017150322A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI658282B (zh) * | 2018-04-16 | 2019-05-01 | 緯創資通股份有限公司 | 偵測裝置及偵測方法 |
CN111443629A (zh) * | 2020-04-02 | 2020-07-24 | 南京理工大学 | 一种应用于立方星制动帆的供电与控制电路 |
US10728985B2 (en) | 2018-10-16 | 2020-07-28 | Koito Manufacturing Co., Ltd. | Vehicle lamp and lighting circuit |
WO2021192368A1 (ja) * | 2020-03-24 | 2021-09-30 | ローム株式会社 | 発光制御装置、発光装置及び車両 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017217318A1 (ja) * | 2016-06-13 | 2017-12-21 | 株式会社小糸製作所 | 負荷駆動装置、車両用灯具 |
CN109691235B (zh) * | 2016-09-09 | 2021-02-19 | 株式会社小糸制作所 | 点亮电路、车辆用灯具及光源的驱动方法 |
CA3019815A1 (en) * | 2017-10-11 | 2019-04-11 | Yourtruckshop Inc. | Truck headlight circuit |
IL255585B (en) * | 2017-11-09 | 2021-01-31 | Zak Alexander | Battery operated current stabilizer for pulsating loads |
US10686379B2 (en) | 2018-02-06 | 2020-06-16 | Linear Technology Holding, LLC | Load current feedforward schemes for current-mode controlled power converters |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012226917A (ja) * | 2011-04-18 | 2012-11-15 | Mitsubishi Electric Corp | 電源装置及び照明装置 |
JP2016058240A (ja) * | 2014-09-10 | 2016-04-21 | パナソニックIpマネジメント株式会社 | 発光素子点灯装置、発光モジュール、および照明装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8258719B2 (en) * | 2008-01-30 | 2012-09-04 | Nxp B.V. | Method and circuit arrangement for regulating a LED current flowing through a LED circuit arrangement, and associated circuit composition and lighting system |
JP6030922B2 (ja) * | 2012-06-11 | 2016-11-24 | 株式会社小糸製作所 | 光源制御装置 |
US8680781B1 (en) * | 2012-09-07 | 2014-03-25 | Infineon Technologies Austria Ag | Circuit and method for driving LEDs |
US8803445B2 (en) * | 2012-09-07 | 2014-08-12 | Infineon Technologies Austria Ag | Circuit and method for driving LEDs |
JP6147073B2 (ja) | 2013-04-30 | 2017-06-14 | 株式会社小糸製作所 | 制御部および車両用灯具 |
CN104202876B (zh) * | 2014-09-01 | 2016-10-05 | 矽力杰半导体技术(杭州)有限公司 | 一种单电感的led驱动电路及驱动方法 |
US9554440B2 (en) * | 2014-10-13 | 2017-01-24 | Seoul Semiconductor Co., Ltd. | Dimmable LED lighting apparatus |
-
2017
- 2017-02-23 CN CN201780014894.1A patent/CN108781495B/zh active Active
- 2017-02-23 WO PCT/JP2017/006743 patent/WO2017150322A1/ja active Application Filing
- 2017-02-23 EP EP17759788.7A patent/EP3426009A4/en not_active Withdrawn
- 2017-02-23 JP JP2018503083A patent/JP6820909B2/ja active Active
-
2018
- 2018-08-30 US US16/117,962 patent/US10710495B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012226917A (ja) * | 2011-04-18 | 2012-11-15 | Mitsubishi Electric Corp | 電源装置及び照明装置 |
JP2016058240A (ja) * | 2014-09-10 | 2016-04-21 | パナソニックIpマネジメント株式会社 | 発光素子点灯装置、発光モジュール、および照明装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3426009A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI658282B (zh) * | 2018-04-16 | 2019-05-01 | 緯創資通股份有限公司 | 偵測裝置及偵測方法 |
US10728985B2 (en) | 2018-10-16 | 2020-07-28 | Koito Manufacturing Co., Ltd. | Vehicle lamp and lighting circuit |
WO2021192368A1 (ja) * | 2020-03-24 | 2021-09-30 | ローム株式会社 | 発光制御装置、発光装置及び車両 |
JP7411068B2 (ja) | 2020-03-24 | 2024-01-10 | ローム株式会社 | 発光制御装置、発光装置及び車両 |
CN111443629A (zh) * | 2020-04-02 | 2020-07-24 | 南京理工大学 | 一种应用于立方星制动帆的供电与控制电路 |
CN111443629B (zh) * | 2020-04-02 | 2021-09-10 | 南京理工大学 | 一种应用于立方星制动帆的供电与控制电路 |
Also Published As
Publication number | Publication date |
---|---|
CN108781495A (zh) | 2018-11-09 |
US10710495B2 (en) | 2020-07-14 |
EP3426009A1 (en) | 2019-01-09 |
EP3426009A4 (en) | 2019-10-09 |
US20190016249A1 (en) | 2019-01-17 |
JPWO2017150322A1 (ja) | 2018-12-27 |
JP6820909B2 (ja) | 2021-01-27 |
CN108781495B (zh) | 2021-04-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2017150322A1 (ja) | 車両用灯具およびその点灯回路 | |
JP6726668B2 (ja) | 車両用灯具および光源の点灯回路 | |
JP6396160B2 (ja) | 車両用灯具およびその点灯回路 | |
US10000150B2 (en) | Lighting circuit and vehicle lamp | |
JP6899710B2 (ja) | 車両用灯具 | |
JP6872413B2 (ja) | 車両用灯具 | |
JP2010503171A (ja) | ランプ駆動回路、及び放電ランプの駆動方法 | |
JP7183018B2 (ja) | 点灯回路および車両用灯具 | |
JPWO2018047915A1 (ja) | 車両用灯具および光源の駆動方法 | |
JP6767860B2 (ja) | コンバータコントローラおよび車両用灯具 | |
JP6307302B2 (ja) | 車両用灯具およびその駆動装置 | |
JP6916649B2 (ja) | 点灯回路および車両用灯具 | |
US10993297B2 (en) | Lighting circuit and vehicular lamp | |
WO2022131303A1 (ja) | 車両用灯具および照明方法 | |
CN107771413B (zh) | 车辆前灯 | |
JP6889612B2 (ja) | 車両用灯具および光源の点灯回路 | |
WO2022091974A1 (ja) | 車両用灯具 | |
WO2022131302A1 (ja) | 車両用灯具 | |
WO2019078127A1 (ja) | 点灯回路および車両用灯具 | |
JP6826381B2 (ja) | 車両用灯具および光源の点灯回路 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2018503083 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2017759788 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2017759788 Country of ref document: EP Effective date: 20181004 |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 17759788 Country of ref document: EP Kind code of ref document: A1 |