CN113940142A - Lamp module and lighting circuit thereof - Google Patents
Lamp module and lighting circuit thereof Download PDFInfo
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- CN113940142A CN113940142A CN202080040768.5A CN202080040768A CN113940142A CN 113940142 A CN113940142 A CN 113940142A CN 202080040768 A CN202080040768 A CN 202080040768A CN 113940142 A CN113940142 A CN 113940142A
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- 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
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- 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
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
-
- 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
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/30—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating rear of vehicle, e.g. by means of reflecting surfaces
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- 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
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/32—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating vehicle sides, e.g. clearance lights
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- 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
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
In a first lighting mode, the drive circuit (210) drives a drive current (I) flowing in the light emitting string (110)LED) Is stabilized to the first current amount (I)REF1) In the second lighting mode, the drive circuit (210) drives the current (I)LED) Is stabilized to be larger than the first current amount (I)REF1) A small second amount of current (I)REF2). In the second lighting mode, when an abnormal state in which no current flows in the light-emitting string (110) is detected, the drive circuit (210) changes the on/off states of the bypass switches (SW 1-SW 2), searches for a recovery state in which current flows in the light-emitting string (110), and fixes the recovery state. Then the drive current (I) flowing in the light emitting string (110)LED) Is stabilized to be larger than the second current amount (I)REF2) A large third amount of current (I)REF3)。
Description
Technical Field
The present invention relates to a lamp module for a motor vehicle or the like.
Background
Various lamps such as a high beam, a low beam, an outline marker Lamp (position Lamp), a Daytime Running Lamp (DRL), a brake Lamp, and a tail Lamp are mounted in an automobile.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2010-241347
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made under such circumstances, and an exemplary object of one aspect thereof is to provide a lamp module or a lighting circuit capable of switching the functions of two lamps.
Means for solving the problems
One aspect of the present invention relates to a lighting circuit for driving a light emitting string including a plurality of light emitting elements, the lighting circuit being used in a lamp capable of switching between a first lighting mode and a second lighting mode. The lighting circuit includes: a drive circuit that (i) stabilizes time-averaging of a drive current flowing in the light emitting string to a first current amount in a first lighting mode, and (ii) stabilizes time-averaging of the drive current to a second current amount smaller than the first current amount in a second lighting mode; and a plurality of bypass switches. The plurality of bypass switches are respectively connected in parallel with a corresponding at least one of the plurality of light emitting elements. In the second lighting mode, when an abnormal state in which no current flows in the light emitting string is detected, the drive circuit changes the on/off states of each of the plurality of bypass switches, searches for a recovery state in which a current flows in the light emitting string, sets the plurality of bypass switches to the recovery state, and stabilizes the time-averaged amount of the drive current flowing in the light emitting string to a third current amount larger than the second current amount.
According to this aspect, even when a disconnection failure occurs in the light-emitting string, by bypassing the disconnection portion, it is possible to prevent the light-emitting string from being unlighted. When the disconnection portion is bypassed, the number of light-emitting elements that can be turned on decreases and the light amount decreases, but the time average of the drive current flowing in the light-emitting string is increased as compared with the normal state to compensate for the decrease in the number, and thus the decrease in the light amount can be suppressed.
The light emitting string may comprise N light emitting elements. When the number of light emitting elements through which current flows in the recovery state is K, the third current amount may be N/K times the second current amount. This makes it possible to equalize the light quantity in the abnormal state with the light quantity in the normal state.
The light emitting string may be divided into M groups each including the same number of light emitting elements, and the plurality of bypass switches may include M bypass switches. The third amount of current may be M/(M-1) times the second amount of current. This makes it possible to equalize the light quantity in the abnormal state with the light quantity in the normal state.
The light emitting string may include four light emitting elements, and may be M ═ 2.
The first lighting mode may be a stop lamp and the second lighting mode may be a tail lamp.
The first lighting mode may be a daytime running lamp, and the second lighting mode may be a position light.
Another aspect of the invention relates to a luminaire module. The lamp module is provided with: a light emitting string comprising a plurality of light emitting elements; and a lighting circuit as described in any one of the above, which drives the light emitting string.
It should be noted that any combination of the above-described constituent elements, constituent elements of the present invention, and expressions of the present invention are also effective as embodiments of the present invention.
Effects of the invention
According to an aspect of the present invention, a lighting fixture module or a lighting circuit capable of switching functions of two lamps can be provided.
Drawings
Fig. 1 is a block diagram of a lighting system including a lighting module according to an embodiment.
Fig. 2 is a timing chart illustrating an operation of the lamp module of fig. 1.
Fig. 3 is a block diagram showing an example of the configuration of the drive circuit.
Fig. 4 (a) and 4 (b) are circuit diagrams showing examples of the configuration of the driving circuit.
Fig. 5 is a circuit diagram of a lamp module according to modification 1.
Detailed Description
The present invention will be described below based on preferred embodiments with reference to the accompanying drawings. The same or equivalent constituent elements, members, and processes shown in the respective drawings are denoted by the same reference numerals, and overlapping descriptions are appropriately omitted. The embodiments are not intended to limit the invention but to exemplify the invention, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention.
In the present specification, the phrase "the state in which the member a and the member B are connected" includes not only the case in which the member a and the member B are physically and directly connected but also the case in which the member a and the member B are indirectly connected via another member which does not substantially affect the electrical connection state therebetween or impair the functions and effects exerted by the connection therebetween.
Similarly, the phrase "the member C is disposed between the members a and B" includes not only the case where the members a and C are directly connected or the case where the members B and C are directly connected but also the case where the members a and C are indirectly connected via another member which does not substantially affect the electrical connection state thereof or which does not impair the functions and effects exerted by the connection thereof.
In the present specification, reference symbols given to electric signals such as voltage signals and current signals, or circuit elements such as resistors and capacitors indicate voltage values, current values, resistance values, and capacitance values, respectively, as necessary.
Fig. 1 is a block diagram of a lighting system 1 including a lighting module 100 according to an embodiment. The lamp system 1 includes a battery 2, a switch 4, a vehicle-side ECU (Electronic Control Unit) 6, and a lamp 10.
The vehicle lamp 10 includes a high beam 12, a low beam 14, and a lamp module 100. The lamp module 100 is capable of switching between a first function and a second function, among a plurality of functions of the vehicle lamp 10. In the present embodiment, the vehicle lamp 10 is a head lamp (head lamp), the first function is a daytime running lamp (denoted by DRL), and the second function is a clearance lamp (denoted by CLR).
The lamp module 100 includes the light-emitting string 110 and the lighting circuit 200, which are unitized, and the finished product of the lamp module 100 is assembled to the vehicle lamp 10.
The light emitting string 110 includes a plurality of N (N ≧ 2) light emitting elements 112 connected in series. The light-emitting element 112 is, for example, an LED (light-emitting diode), but may be another semiconductor light-emitting element such as an LD (laser diode) or an organic EL (Electro Luminescence) element. In the present embodiment, the light-emitting string 110 includes 4 light-emitting elements 112_1 to 112_4 connected in series. The number N of the light-emitting elements 112 may be 3 or more than 4.
The voltage (battery voltage) V from the battery 2 is transmitted via the switch 4BATIs supplied as power to the lighting circuit 200. Further, a lighting instruction DRL for a daytime running lamp or a lighting instruction CLR for an outline marker lamp is input from the vehicle-side ECU 6.
The lighting circuit 200 operates in the first lighting mode to cause the light emitting string 110 to emit light at a first light amount when receiving a lighting instruction of the DRL, and operates in the second lighting mode to cause the light emitting string 110 to emit light at a second light amount smaller than the first light amount when receiving the lighting instruction of the DRL.
The lighting circuit 200 includes a driving circuit 210 and a plurality of bypass switches SW1, SW 2.
(i) In the first lighting mode, the driving circuit 210 drives the driving current I flowing in the light emitting string 110LEDIs stabilized to the first current amount IREF1(ii) in the second lighting mode, the driving circuit 210 drives the current ILEDIs stabilized to be less than the first current amount IREF1Second amount of current IREF2. The driving circuit 210 may control the driving current I by DC dimmingLEDThe driving current I can be controlled by PWM (Pulse Width Modulation) dimmingLEDCan also be controlled by their combinationLEDTime-averaged.
The bypass switches SW1 and SW2 correspond to a plurality of groups in which the light emitting elements 112_1 to 112_4 are divided into a plurality of groups including at least one light emitting element. In this example, the light emitting string 110 is divided into M groups each including the same number of light emitting elements 112, and since M is 2, two bypass switches SW1 and SW2 are provided. The bypass switch SW1 is connected in parallel with a pair of the light emitting elements 112_1 and 112_2 as the first group, and the bypass switch SW2 is connected in parallel with a pair of the light emitting elements 112_3 and 112_4 as the second group.
In the present embodiment, since the bypass switches SW1 and SW2 are normally fixed to be off, the drive current I flowing through the light emitting string 110LEDAnd the output current I of the driving circuit 210OUTAre equal.
The driving circuit 210 is configured to detect that the light emitting string 110 does not have the driving current ILEDAbnormal state of flow. When the abnormal state is detected in the second lighting mode, the driving circuit 210 changes the on/off states of the bypass switches SW1 and SW2, respectively, so that the driving current I is appliedLEDThe running light string 110 is searched for recovery and stored as a recovered state. Then, while the lighting instruction in the second lighting mode continues, the plurality of bypass switches SW1 and SW2 are set to the recovery state, and the drive current I flowing through the light emitting string 110 is set to the drive current ILEDIs stabilized to be greater thanA second amount of current IREF2Of a third amount of current IREF3. This mode is referred to as an abnormal lighting mode.
In the abnormal lighting mode, the third current amount I is determined so that the light amount as the outline marker lamp can be maintainedREF3. Therefore, the third current amount IREF3Preferably a second amount of current IREF2Is M/(M-1) times. In this embodiment, M is 2, so α is 2, IREF3＝2×IREF2. When the driving circuit 210 corresponds to the DC dimming, the output current I is setOUTThe amount of the direct current of (c) may be increased to two times, and when the drive circuit 210 corresponds to the PWM dimming, the output current I is set to be the sameOUTIs increased to two times.
The above is the structure of the lamp module 100. Next, the operation will be described. Fig. 2 is a timing chart illustrating an operation of the lamp module 100 of fig. 1.
When at time t1When the lighting instruction of the DRL is given, the driving circuit 210 operates in the first lighting mode. The driving circuit 210 generates the first current amount I with time-averaged stabilityREF1Output current I ofOUTAnd as the drive current ILEDTo the light emitting string 110.
When at time t2When the lighting instruction of the CLR is given, the driving circuit 210 shifts to the second lighting mode. The driving circuit 210 generates the second current amount I with time-averaged stabilityREF2Output current I ofOUTAnd as the drive current ILEDTo the light emitting string 110.
Is set at time t3A disconnection fault occurs in the light emitting string 110. In this example, it is assumed that disconnection occurs between the light-emitting element 112_3 and the light-emitting element 112_ 4. When the light emitting string 110 is disconnected, the output current I of the driving circuit 210OUTNo longer flows, at time t4The drive circuit 210 detects this state as an abnormal state.
Next, the drive circuit 210 changes the combination of on and off of the plurality of bypass switches SW1, SW 2. For example, the driving circuit 210 sequentially turns on the plurality of bypass switches SW1 to SW2 one by one to search for a currentThe interruption of (3) is released. Specifically, at time t5Turning on the bypass switch SW 1. At this time, the current I is outputOUTThe disconnected state is maintained, and thus the abnormality detection state is maintained.
At the next time t6The bypass switch SW2 is turned on. When the bypass switch SW2 is turned on, the broken line part is bypassed, and the current I is drivenLEDThe current flows through a path including the light emitting elements 112_1 and 112_2 and the bypass switch SW2, and the interruption of the current is released. That is, the state where SW1 is off and SW2 is on is the recovery state.
When at time t7When the abnormality detection is released, the drive circuit 210 stores the states (recovery states) of the switches SW1 and SW2 at that time, and then, at time t7Thereafter, the states of the switches SW1, SW2 are fixed. In addition, the driving circuit 210 makes the output current I of the driving circuit 210OUTIncreased to a third amount of current IREF3And shifts to the abnormal lighting mode. Thus, the light emitting elements 112_1 and 112_2 in the light emitting string 110 pass the third current amount IREF3Drive current I ofLEDAnd is driven.
The above is the operation of the lamp module 100. Next, advantages of the luminaire module 100 will be explained.
According to the lamp module 100, a lamp having the functions of daytime running time and a position light can be modularized. Thus, the assembly of the vehicle lamp 10 can be simplified as compared with a case where the daytime running time and the position light are unitized separately.
In addition, in the lamp having two functions, the single light emitting string 110 is used in combination, and the lamp is driven by the single driving circuit 210, so that the number of components and the cost can be reduced, and the size of the lamp module 100 can be reduced.
Further, according to the lamp module 100, even when a disconnection failure occurs in the light-emitting string 110, by searching for a disconnection portion and bypassing the disconnection portion, it is possible to prevent the light-emitting string 110 from being unlighted.
When the broken portion is bypassed, the number of light emitting elements 112 that can be lit is reduced and the amount of light is reducedCompensating for the reduction in the number of light emitting strings 110LEDThe time average of (b) is increased as compared with the normal state, whereby a decrease in the light amount can be suppressed. In the example of fig. 2, four light emitting elements 112_1 to 112_4 can be turned on in the normal state, and two light emitting elements 112_1 and 112_2 can be turned on in the abnormal state, but the amount of light in the abnormal state can be made equal to the amount of light in the normal state by doubling the drive current.
As described above, according to the lamp module 100, even when the light-emitting string 110 is disconnected, at least the function as the outline marker lamp can be maintained.
When the disconnection failure is detected in the daytime running light, the driving circuit 210 is stopped because the light amount is insufficient.
The present invention is grasped as a block diagram and a circuit diagram of fig. 1, or relates to various apparatuses and methods derived from the above description, and is not limited to a specific configuration. Hereinafter, a more specific configuration example and example will be described in order to facilitate understanding of the essence and operation of the present invention and to clarify the same, without narrowing the scope of the present invention.
Fig. 3 is a block diagram showing an example of the configuration of the drive circuit 210. The driving circuit 210 includes a constant current driver 212, an abnormality detection circuit 214, and a controller 216.
The constant current driver 212 may be a linear regulator for constant current output, a switching converter (DC/DC converter) for constant current output, or a combination of a switching converter for constant voltage output and a constant current circuit. The constant current driver 212 outputs a current IOUTIs stabilized to the current amount I indicated by the controller 216REF。
The abnormality detection circuit 214 detects that the light emitting string 110 does not have the driving current ILEDA broken line failure of the flow. For example, the abnormality detection circuit 214 monitors the output current I of the constant current driver 212OUTWhen outputting a current IOUTIf the value is lower than a predetermined threshold value, it is determined as an abnormal state.
In the normal state, the controller 216 controls the constant current driver in the first lighting mode212 indicates a first amount of current IREF1Indicating a second amount of current I to the constant current driver 212 in the second lighting modeREF2。
When an abnormality is detected by the abnormality detection circuit 214, the controller 216 changes the combination of the on and off states of the plurality of bypass switches SW1 and SW2 to identify the disconnection point, fixes the bypass switch connected in parallel with the disconnection point to be on, and fixes the other switches to be off. In addition, in the second lighting mode, the third current amount I is instructed to the constant current driver 212REF3。
The configuration of the driving circuit 210 in fig. 3 is merely an example, and those skilled in the art will understand that various modifications of the configuration exist and such modifications are included in the scope of the present invention.
Fig. 4 (a) and 4 (b) are circuit diagrams showing an example of the configuration of the drive circuit 210. The driving circuit 210 in fig. 4 (a) includes a buck converter 230 and a conversion controller 232. The buck converter 230 includes a switching transistor M1, a rectifying element D1, an inductor L1, a capacitor C1, and a sense resistor Rs. The sensing resistor Rs is set at the driving current IOUTOn the path of (c). The conversion controller 232 controls the switching transistor M1 such that the voltage drop Vs (Vs ═ I) of the sense resistor RsOUTXrs) approaches a predetermined target voltage VREF. Thereby outputting IOUTIs stabilized to be close to IREF＝VREF/Rs。
As the rectifying element D1, a synchronous rectification type using a transistor may be used. In addition, when the number M of the light emitting elements 122 connected in series is large, a boost converter can be used.
As shown in fig. 4 (b), the driving circuit 210 may be configured by a linear regulator. The linear regulator may be of a current source type shown in fig. 4 (b) or a current sink type not shown.
The present invention has been described above based on the embodiments. It will be understood by those skilled in the art that this embodiment is an example, and various modifications are possible in combination of the respective constituent elements and the respective processes, and such modifications are also within the scope of the present invention. Hereinafter, such a modification will be described.
(modification 1)
Fig. 5 is a circuit diagram of a lamp module 100A according to modification 1. In modification 1, the light emitting string 110 is divided into four groups each including one light emitting element, and the lighting circuit 200A includes four bypass switches SW1 to SW 4. I.e., M ═ 4.
When the disconnection fault is detected, the controller 216 of the drive circuit 210A switches the on and off states of the bypass switches SW1 to SW4, and determines the disconnection portion. In this case, the third current amount IREF3To a second current amount IREF2Is 4/3 times.
(modification 2)
When the current interruption is not released even when the plurality of bypass switches are sequentially turned on one by one, the controller 216 may be turned on while switching the combination of the pair of bypass switches. Then, when the current interruption is released in a state where a certain pair of bypass switches are turned on, the third current amount I is setREF3Set to a second current amount IREF2α may be M/(M-2) times. Thereby, even in the case of two broken lines, the function of the outline marker lamp can be maintained.
The number of bypass switches that can be turned on simultaneously is not limited to one or two, and may be three or more, and three or more disconnection failures can be dealt with. In general, when K is the number of light emitting elements through which a driving current flows in a state where current interruption is released, the light emitting string 110 including M light emitting elements 112 has a third current amount IREF3As long as the second current amount I is setREF2α of (a) may be N/K times.
(modification 3)
Even when a disconnection fault occurs during the first lighting mode, the same processing can be performed. That is, when the disconnection fault is detected in the first lighting mode, the bypass switch is turned on and off to search for a recovery state in which the disconnection portion is bypassed. Then, the bypass switches are fixed to the recovery state, and the drive current I is set to be equal to the recovery currentLEDTime ofSet to the third current amount I on averageREF3. Thus, when a lighting instruction is given in the DRL, the outline marker lamp can be turned on without turning on the DRL. In addition, the output current I of the driving circuit 210 may be set during the search period of the broken line portionOUTFrom a first current magnitude IREF1Changing to a second amount of current IREF2。
(modification 4)
When a disconnection fault occurs, the function of the daytime running light can be maintained in addition to the function of the position light. Specifically, when an abnormal state is detected during the lighting of the daytime running light, that is, in the first lighting mode, the disconnection portion may be searched for, and the disconnection portion may be short-circuited by the bypass switch connected in parallel thereto, so that the time average of the drive current may be increased to the fourth current amount larger than the first current amount. In the light-emitting string 110 including M light-emitting elements 112, when K is the number of light-emitting elements through which a drive current flows in a state where current interruption is released, a fourth current amount I is setREF4Set to a first current amount IREF1N/K times of (1).
(modification 5)
In an embodiment, the output current I of the driving circuit 210 is controlled by controlling the output current IOUTIs varied in time average in each mode so that the drive current I in each mode is variedLEDBut is not limited to this. In modification 5, the output current I of the driving circuit 210 may be setOUTThe driving current I in each lighting mode is controlled by PWM dimming using a bypass switch SW so that the driving current I is constant regardless of the lighting modeLEDTime-averaged.
Refer to fig. 1. The on duty of the bypass switch SW # and the lighting duty of the light emitting element 112_ # connected in parallel thereto have a complementary relationship. For example, when the on duty of the bypass switch SW # is d%, the lighting duty of the light emitting element 112_ # is (100-d)%.
For example, in the first lighting mode, all the bypass switches SW are fixed to be off (on duty d is 0%). At this time, the lighting duty of the light emitting string 110 is 100%, and thus the driving current ILEDTime-averaging (first amount of current))IREF1In order to realize the purpose,
IREF1＝IOUT。
at a first current magnitude IREF1And a second amount of current IREF2In the above-mentioned manner,
IREF2＝β×IREF1
the relationship of (1) holds. Wherein beta is more than 0 and less than 1.
At this time, in the second lighting mode, all the bypass switches SW are switched at a duty ratio of (1- β) × 100%. At this time, since the lighting duty ratio of light emitting string 110 is (β × 100)%, drive current I is set to be equal toLEDTime-averaged (second amount of current) of (I)REF2In order to realize the purpose,
IREF2＝β×IOUT。
due to IREF1＝IOUTAnd is thus IREF2＝IREF1×β。
At a third current magnitude IREF3And a second amount of current IREF2In the above-mentioned manner,
IREF3＝α×IREF2
the relationship of (1) holds. Wherein 1 is less than alpha.
At this time, in the abnormal lighting mode, all the bypass switches SW are switched at a duty ratio of (1- α × β) × 100%. At this time, since the lighting duty ratio of light emitting string 110 is (α × β × 100)%, drive current I is set to be (α × β × 100)%LEDTime-averaged (third amount of current) ofREF3In order to realize the purpose,
IREF3＝α×β×IOUT。
i.e. IREF3＝IREF2×α。
(modification 6)
The first lighting mode is associated with the DRL, and the second lighting mode is associated with the clearance lamp, but the present invention is not limited thereto, and the first lighting mode may be associated with the stop lamp, and the second lighting mode may be associated with the tail lamp.
The present invention has been described based on the embodiments using specific terms, but the embodiments are merely illustrative of the principle and application of the present invention, and various modifications and arrangements may be made to the embodiments without departing from the spirit of the present invention defined in the claims.
Industrial applicability
The present invention relates to a lamp module for a motor vehicle or the like.
Description of reference numerals:
1: a light fixture system;
2: a battery;
4: a switch;
6: a vehicle-side ECU;
10: a vehicular lamp;
12: a high beam;
14: passing light;
100: a light fixture module;
110: a light emitting string;
112: a light emitting element;
200: a lighting circuit;
SW1, SW 2: a bypass switch;
210: a drive circuit;
212: a constant current driver;
214: an abnormality detection circuit;
216: and a controller.
Claims (7)
1. A lighting circuit for a lamp capable of switching between a first lighting mode and a second lighting mode, for driving a light emitting string including a plurality of light emitting elements,
it is characterized in that the preparation method is characterized in that,
the lighting circuit includes:
a drive circuit that (i) stabilizes time-averaged driving currents flowing in the light emitting strings to a first current amount in a first lighting mode, and (ii) stabilizes time-averaged driving currents to a second current amount smaller than the first current amount in a second lighting mode; and
a plurality of bypass switches respectively connected in parallel with a corresponding at least one of the plurality of light emitting elements,
in the second lighting mode, when an abnormal state in which no current flows in the light-emitting string is detected, the drive circuit changes the on/off states of the bypass switches, searches for a recovery state in which a current flows in the light-emitting string, sets the bypass switches to the recovery state, and stabilizes the time-averaged driving current flowing in the light-emitting string to a third current amount larger than the second current amount.
2. The lighting circuit according to claim 1,
the light emitting string comprises N light emitting elements,
when the number of light emitting elements through which current flows in the recovery state is K, the third current amount is N/K times the second current amount.
3. The lighting circuit according to claim 1 or 2,
the light emitting string is divided into M groups each containing the same number of light emitting elements,
the plurality of bypass switches comprises M bypass switches,
the third amount of current is M/(M-1) times the second amount of current.
4. The lighting circuit according to claim 3,
the light emitting string includes four light emitting elements, and M is 2.
5. The lighting circuit according to any one of claims 1 to 4,
the first lighting mode is a brake light,
the second lighting mode is a tail lamp.
6. The lighting circuit according to any one of claims 1 to 4, wherein the first lighting mode is a daytime running light,
the second lighting mode is a position light.
7. A light fixture module, characterized in that,
the lamp module is provided with:
a light emitting string comprising a plurality of light emitting elements; and
the lighting circuit according to any one of claims 1 to 6, which drives the light emitting string.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019142223 | 2019-08-01 | ||
| JP2019-142223 | 2019-08-01 | ||
| PCT/JP2020/029348 WO2021020538A1 (en) | 2019-08-01 | 2020-07-30 | Lamp module and lighting circuit therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113940142A true CN113940142A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080040768.5A Pending CN113940142A (en) | 2019-08-01 | 2020-07-30 | Lamp module and lighting circuit thereof |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7430188B2 (en) |
| CN (1) | CN113940142A (en) |
| WO (1) | WO2021020538A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113071405B (en) * | 2021-03-30 | 2022-12-09 | 一汽解放汽车有限公司 | Daytime running lamp drive control method and device, computer equipment and storage medium |
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| US20110148306A1 (en) * | 2009-12-18 | 2011-06-23 | Ampower Technology Co., Ltd. | Bypass protection circuit and light emitting diode driving device using the same |
| US20150163871A1 (en) * | 2013-12-06 | 2015-06-11 | Koito Manufacturing Co., Ltd. | Vehicular lamp |
| JP2016197711A (en) * | 2015-04-06 | 2016-11-24 | 株式会社小糸製作所 | Drive circuit and vehicle lighting device |
| CN108621910A (en) * | 2018-01-23 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of dynamic daytime running lamps system |
| CN208046977U (en) * | 2018-04-24 | 2018-11-02 | 华域视觉科技(上海)有限公司 | A kind of sequential starting controlling circuit, lighting device and lighting system |
| CN108800036A (en) * | 2017-04-28 | 2018-11-13 | 株式会社小糸制作所 | Lamps apparatus for vehicle |
| US20180339642A1 (en) * | 2017-05-26 | 2018-11-29 | Koito Manufacturing Co., Ltd. | Vehicle lamp and lighting circuit of light source |
-
2020
- 2020-07-30 CN CN202080040768.5A patent/CN113940142A/en active Pending
- 2020-07-30 WO PCT/JP2020/029348 patent/WO2021020538A1/en active Application Filing
- 2020-07-30 JP JP2021535445A patent/JP7430188B2/en active Active
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| US20110148306A1 (en) * | 2009-12-18 | 2011-06-23 | Ampower Technology Co., Ltd. | Bypass protection circuit and light emitting diode driving device using the same |
| US20150163871A1 (en) * | 2013-12-06 | 2015-06-11 | Koito Manufacturing Co., Ltd. | Vehicular lamp |
| JP2016197711A (en) * | 2015-04-06 | 2016-11-24 | 株式会社小糸製作所 | Drive circuit and vehicle lighting device |
| CN108800036A (en) * | 2017-04-28 | 2018-11-13 | 株式会社小糸制作所 | Lamps apparatus for vehicle |
| US20180339642A1 (en) * | 2017-05-26 | 2018-11-29 | Koito Manufacturing Co., Ltd. | Vehicle lamp and lighting circuit of light source |
| CN108621910A (en) * | 2018-01-23 | 2018-10-09 | 常州星宇车灯股份有限公司 | A kind of dynamic daytime running lamps system |
| CN208046977U (en) * | 2018-04-24 | 2018-11-02 | 华域视觉科技(上海)有限公司 | A kind of sequential starting controlling circuit, lighting device and lighting system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021020538A1 (en) | 2021-02-04 |
| JPWO2021020538A1 (en) | 2021-02-04 |
| JP7430188B2 (en) | 2024-02-09 |
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