EP2200403A1 - Current-regulated light emitting device for vehicle use - Google Patents
Current-regulated light emitting device for vehicle use Download PDFInfo
- Publication number
- EP2200403A1 EP2200403A1 EP08167800A EP08167800A EP2200403A1 EP 2200403 A1 EP2200403 A1 EP 2200403A1 EP 08167800 A EP08167800 A EP 08167800A EP 08167800 A EP08167800 A EP 08167800A EP 2200403 A1 EP2200403 A1 EP 2200403A1
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- EP
- European Patent Office
- Prior art keywords
- light emitting
- switch
- connected electrically
- unit
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000001105 regulatory effect Effects 0.000 title claims description 23
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000005669 field effect Effects 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/28—Circuit arrangements for protecting against abnormal temperature
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
Definitions
- the invention relates to a light emitting device, more particularly to a current-regulated light emitting device for vehicle use.
- the voltage regulating unit 65 When the electric power source 61 is unstable such that the drive voltage therefrom fluctuates, the voltage regulating unit 65 will operate to adjust the drive voltage to an appropriate value and to supply a stable current for the light emitting unit 64. In view of the need for continuous operation of the voltage regulating unit 65, the operating temperature thereof will increase, and prolonged operation at high temperatures affects operating stability and service life of the voltage regulating unit 65.
- a current-regulated light emitting device for vehicle use of the present invention comprises a light emitting unit and a current limiting unit.
- the light emitting device includes at least one light emitting module that has a light emitting component.
- the current limiting unit includes a first switch, a first bias unit, a second switch and a second bias unit.
- the first switch is adapted for making and breaking an electrical circuit between the light emitting unit and the electric power source.
- the first bias unit is connected electrically to the first switch, is adapted to be connected electrically to the electric power source, and causes the first switch to conduct such that the first switch makes the electrical circuit between the light emitting unit and the electric power source when the electric power source provides the drive voltage to the first bias unit, thereby resulting in current flow from the electric power source through the light emitting unit and the first switch to activate the light emitting unit.
- the second switch is connected electrically to the first switch.
- the second bias unit is connected electrically to the first and second switches, and causes the second switch to conduct when amount of current flowing through the first switch exceeds a predetermined threshold. Conduction of the second switch forces the first switch to turn off so as to break the electrical circuit between the light emitting unit and the electric power source, thereby interrupting the current flow through the light emitting unit.
- the light emitting unit 1 is used as a vehicle light for illumination, is adapted for electrical connection to the electric power source 4 and the brake device 5, and includes a plurality of light emitting modules 11 connected in parallel, and three protective components 12.
- Each light emitting module 11 includes a first light emitting component (D1), a second light emitting component (D2), and a pair of current limiting resistors (R). It is noted that, in practice, the number of the light emitting components of each light emitting module 11 is not limited to two.
- the current limiting resistors (R) of each light emitting module 11 are connected in parallel, and the parallel-connected current limiting resistors (R) are connected in series between the respective first light emitting component (D1) and the protective components 12.
- the first switch (Q1) is a n-channel depletion-type metal-oxide-semiconductor field-effect transistor (MOSFET). In practice, other components that can serve the same function may be used.
- the first switch (Q1) has a first control end (G), a first input end (D), and a first output end (S).
- the first control end (G) is the gate and is connected electrically to the first bias unit.
- the first input end (D) is the drain and is connected electrically to the cathodes of the second light emitting components (D2) of the light emitting modules 11 of the light emitting unit 1.
- the first output end (S) is the source and is connected electrically to the first resistors (R10) of the second bias unit.
- the first switch (Q1) must be capable of bearing a voltage, which has a value larger than the drive voltage (V1), between the first input end (D) and the first output end (S).
- the fourth resistor (R4) is connected electrically at one end to the brake device 5 via one of the protective components 12, and is further connected electrically at the other end to the fifth resistor (R5) and the second capacitor (C2).
- the fifth resistor (R5) is connected in parallel to the second capacitor (C2), and the fifth resistor (R5) and the second capacitor (C2) are grounded at one end.
- the coupling resistors (R6) are connected in parallel, and the parallel-connected coupling resistors (R6) are connected electrically at one end to the first output end (S) and the second control end (B), and are further connected electrically at another end to the third switch (Q3).
- the third switch (Q3) is a n-channel depletion-type MOSFET, and has a third control end (G) connected electrically to a junction of the fourth and fifth resistors (R4, R5), a third input end (D) connected electrically to the coupling resistors (R6), and a third output end (S) connected electrically to the second output end (E), which is grounded.
- the third control end (G) is the gate, the third input end (D) is the drain, and the third output end (S) is the source of the MOSFET.
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
- The invention relates to a light emitting device, more particularly to a current-regulated light emitting device for vehicle use.
- Generally, a vehicle uses its battery to provide electric power for vehicle lights. Since battery voltage cannot be maintained at a constant level, battery power must undergo voltage stabilization and current rectification before it is supplied to the vehicle lights.
- Referring to
Figure 1 , a conventional voltage-stabilized light emitting device for vehicle use is shown to be adapted for electrical connection to anelectric power source 61 of a vehicle, and includes arectifier 62 adapted for electrical connection to theelectric power source 61, asurge suppressor 63, alight emitting unit 64, and avoltage regulating unit 65 interconnecting thelight emitting unit 64 and therectifier 62. Thelight emitting unit 64 includes a plurality of light emitting components (D) and a plurality of current limiting resistors (R1). The light emitting components (D) are connected in series-pairs, and all of the series-pairs of the light emitting components (D) are then connected in parallel. Thevoltage regulating unit 65 includes a voltage stabilizing integrated circuit (IC), two resistors (R2), and a capacitor (C) . Thevoltage regulating unit 65 serves to stabilize a drive voltage from theelectric power source 61 before supplying the same to thelight emitting unit 64. - When the
electric power source 61 is unstable such that the drive voltage therefrom fluctuates, thevoltage regulating unit 65 will operate to adjust the drive voltage to an appropriate value and to supply a stable current for thelight emitting unit 64. In view of the need for continuous operation of thevoltage regulating unit 65, the operating temperature thereof will increase, and prolonged operation at high temperatures affects operating stability and service life of thevoltage regulating unit 65. - Therefore, the object of the present invention is to provide a highly stable current-regulated light emitting device for vehicle use with a switching design that permits components thereof to operate at a lower operating temperature.
- Accordingly, a current-regulated light emitting device for vehicle use of the present invention comprises a light emitting unit and a current limiting unit.
- The light emitting device includes at least one light emitting module that has a light emitting component. The current limiting unit includes a first switch, a first bias unit, a second switch and a second bias unit.
- The first switch is adapted for making and breaking an electrical circuit between the light emitting unit and the electric power source. The first bias unit is connected electrically to the first switch, is adapted to be connected electrically to the electric power source, and causes the first switch to conduct such that the first switch makes the electrical circuit between the light emitting unit and the electric power source when the electric power source provides the drive voltage to the first bias unit, thereby resulting in current flow from the electric power source through the light emitting unit and the first switch to activate the light emitting unit. The second switch is connected electrically to the first switch. The second bias unit is connected electrically to the first and second switches, and causes the second switch to conduct when amount of current flowing through the first switch exceeds a predetermined threshold. Conduction of the second switch forces the first switch to turn off so as to break the electrical circuit between the light emitting unit and the electric power source, thereby interrupting the current flow through the light emitting unit.
- Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
-
Figure 1 is a schematic circuit diagram of a conventional, voltage-stabilized light emitting device for vehicle use; -
Figure 2 is a functional block diagram of the preferred embodiment of a current-regulated light emitting device according to the present invention; and -
Figure 3 is a schematic circuit diagram of the preferred embodiment. - Referring to
Figures 2 and3 , the preferred embodiment of a current-regulated light emitting device for vehicle use according to the present invention is shown to be adapted for electrical connection to an electric power source 4 and abrake device 5 of a vehicle. The electric power source 4 is operable to output a drive voltage (V1), and thebrake device 5 is operable to output a braking voltage (V2). The current-regulated light emitting device comprises alight emitting unit 1, a current limitingunit 2, and a brightness increasing unit 3. - The
light emitting unit 1 is used as a vehicle light for illumination, is adapted for electrical connection to the electric power source 4 and thebrake device 5, and includes a plurality oflight emitting modules 11 connected in parallel, and threeprotective components 12. Eachlight emitting module 11 includes a first light emitting component (D1), a second light emitting component (D2), and a pair of current limiting resistors (R). It is noted that, in practice, the number of the light emitting components of eachlight emitting module 11 is not limited to two. The current limiting resistors (R) of eachlight emitting module 11 are connected in parallel, and the parallel-connected current limiting resistors (R) are connected in series between the respective first light emitting component (D1) and theprotective components 12. - In this embodiment, each of the
protective components 12 is an ordinary diode, e.g., 1N4007. One of theprotective components 12 has an anode connected to the electric power source 4 and a cathode connected to thelight emitting modules 11. Another of theprotective components 12 has an anode connected to thebrake device 5 and a cathode connected to thelight emitting modules 11. The last of theprotective components 12 has an anode connected to thebrake device 5 and a cathode connected to the brightness increasing unit 3. Theprotective components 12 are used to protect the device of this invention from damage due to reverse polarity connection with the electric power source 4. - The current limiting
unit 2 includes a first switch (Q1), a second switch (Q2), a pair of first resistors (R10) that serve as a second bias unit, second and third resistors (R20, R30) that form a voltage divider of a first bias unit, and a first capacitor (C1). - In this embodiment, the first switch (Q1) is a n-channel depletion-type metal-oxide-semiconductor field-effect transistor (MOSFET). In practice, other components that can serve the same function may be used. The first switch (Q1) has a first control end (G), a first input end (D), and a first output end (S). The first control end (G) is the gate and is connected electrically to the first bias unit. The first input end (D) is the drain and is connected electrically to the cathodes of the second light emitting components (D2) of the
light emitting modules 11 of thelight emitting unit 1. The first output end (S) is the source and is connected electrically to the first resistors (R10) of the second bias unit. The first switch (Q1) must be capable of bearing a voltage, which has a value larger than the drive voltage (V1), between the first input end (D) and the first output end (S). - In this embodiment, the second switch (Q2) is a npn-type bipolar junction transistor (BJT) that has a second control end (B) connected electrically to the first output end (D) and the first resistors (R10) of the second bias unit, a second input end (C) connected electrically to the first control end (G) and the first bias unit, and a second output end (E) that is grounded. The second control end (B) is the base of the bipolar junction transistor, the second input end (C) is the collector, and the second output end (E) is the emitter. In practice, a MOSFET may be used for the second switch (Q2) in other embodiments of this invention. However, since the conduction voltage required by the npn-type bipolar junction transistor is smaller than that of the MOSFET, which has a benefit of reducing power loss attributed to the first resistors (R10), the npn-type bipolar junction transistor is used for the second switch (Q2) in the preferred embodiment of this invention.
- The first resistors (R10) of the second bias unit are connected in parallel, are connected electrically at one end to the first output end (S) and the second control end (B), and are further connected electrically at another end to the second output end (E), which is grounded. The second resistor (R20) of the voltage divider of the first bias unit is connected electrically at one end to the electric power source 4 via one of the
protective components 12 and to thebrake device 5 via another of theprotective components 12. The second resistor (R20) is further connected electrically in series at another end to one end of the third resistor (R30). The first control end (G) and the second input end (C) are connected electrically to a junction of the second and third resistors (R20, R30). The third resistor (R30) is further connected electrically at another end to the second output end (E), which is grounded. The first capacitor (C1) is shunted to the third resistor (R30) for noise filtering. - The brightness increasing unit 3 is connected electrically to the
brake device 5 and the current limitingunit 2, and includes fourth and fifth resistors (R4, R5) that form a voltage divider of a third bias unit, a second capacitor (C2), a plurality of coupling resistors (R6), and a third switch (Q3). - The fourth resistor (R4) is connected electrically at one end to the
brake device 5 via one of theprotective components 12, and is further connected electrically at the other end to the fifth resistor (R5) and the second capacitor (C2). The fifth resistor (R5) is connected in parallel to the second capacitor (C2), and the fifth resistor (R5) and the second capacitor (C2) are grounded at one end. The coupling resistors (R6) are connected in parallel, and the parallel-connected coupling resistors (R6) are connected electrically at one end to the first output end (S) and the second control end (B), and are further connected electrically at another end to the third switch (Q3). In this embodiment, the third switch (Q3) is a n-channel depletion-type MOSFET, and has a third control end (G) connected electrically to a junction of the fourth and fifth resistors (R4, R5), a third input end (D) connected electrically to the coupling resistors (R6), and a third output end (S) connected electrically to the second output end (E), which is grounded. The third control end (G) is the gate, the third input end (D) is the drain, and the third output end (S) is the source of the MOSFET. - In operation, when the electric power source 4 provides the drive voltage (V1) to the voltage divider of the first bias unit, a voltage sufficient to cause the first switch (Q1) to conduct will be present at the first control end (G), such that the first switch (Q1) makes an electrical circuit between the
light emitting unit 1 and the electric power source 4 to result in current flow from the electric power source 4 through the current limiting resistors (R), the first and second light emitting components (D1, D2), the first switch (Q1), and the first resistors (R10) of the second bias unit, thereby activating the first and second light emitting components (D1, D2) of thelight emitting modules 11 of thelight emitting unit 1 to emit light. - When the drive voltage (V1) fluctuates such that the amount of current flowing through the first switch (Q1) exceeds a predetermined threshold, the voltage across the first resistors (R10) reaches 0. 7 volt, which is sufficient to cause the second switch (Q2) conduct. Conduction of the second switch (Q2) forces the first switch (Q1) to turn off so as to break the electrical circuit between the
light emitting unit 1 and the electric power source 4, thereby interrupting the current flow through thelight emitting unit 1 so as to deactivate the first and second light emitting components (D1, D2) of thelight emitting modules 11 of thelight emitting unit 1. - When the current flow through the
light emitting unit 1 is interrupted, the voltage at the second control end (B) will become lower than the conduction voltage required by the second switch (Q2), thereby turning off the second switch (Q2) so that the voltage at the first control end (G) is once again sufficient to cause the first switch (Q1) to conduct. When the first switch (Q1) conducts, the electrical circuit between thelight emitting unit 1 and the electric power source 4 is made so that the first and second light emitting components (D1, D2) of thelight emitting modules 11 of thelight emitting unit 1 are activated to emit light once more. Therefore, due to alternating switching of the first and second switches (Q1, Q2), the amount of current flowing through thelight emitting modules 11 of thelight emitting unit 1 can be regulated. - In this embodiment, when the brake of the vehicle is operated, the
brake device 5 outputs the braking voltage (V2) that is received by the third bias unit. The braking voltage (V2) is divided by the fourth and fifth resistors (R4, R5) of the voltage divider of the third bias unit such that the voltage at the third control end (G) is sufficient to cause the third switch (Q3) to conduct. When the third switch (Q3) conducts, the coupling resistors (R6) are connected in parallel to the first resistors (R10) to result in a lower equivalent resistance. As a result, a larger amount of electric current is required to flow through the first output end (S) before the second switch (Q2) conducts. In other words, by connecting the coupling resistors (R6) in parallel to the first resistors (R10), the predetermined threshold is reconfigured so as to allow a larger amount of current to flow through thelight emitting unit 1 and the first switch (Q1) before the second switch (Q2) conducts. The larger amount of current flowing through the first and second light emitting components (D1, D2) results in increased brightness in the light emitted thereby. Therefore, when the brake is operated, the brightness increasing unit 3 enables the first and second light emitting components (D1, D2) to emit brighter light for good braking warning indication. - In sum, when electric current not exceeding the predetermined threshold flows through the first and second light emitting components (D1, D2) of the
light emitting modules 11 of thelight emitting unit 1, the first switch (Q1) conducts while the second switch (Q2) is turned off. On the other hand, when electric current exceeding the predetermined threshold flows through the first and second light emitting components (D1, D2), the second switch (Q2) conducts so as to turn off the first switch (Q1), thereby interrupting current flow through thelight emitting unit 1. Through alternating switching of the first and second switches (Q1, Q2), the electric current flowing through thelight emitting unit 1 can be regulated even when the drive voltage (V1) of the electric power source 4 is unstable and fluctuates wildly. The switching design employed in the present invention can prevent components thereof from operating continuously to prevent overheating. That is, the components of the present invention are permitted to operate at a lower operating temperature to result in advantages of higher stability and a longer service life. - Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
- All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
- Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
- The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
Claims (7)
- A current-regulated light emitting device for vehicle use, said current-regulated light emitting device being adapted to receive a drive voltage (V1) from an electric power source (4) and being characterized by:a light emitting unit (1) including at least one light emitting module (11) that has a light emitting component (D1, D2); anda current limiting unit (2) includinga first switch (Q1) adapted for making and breaking an electrical circuit between said light emitting unit (1) and the electric power source (4),a first bias unit connected electrically to said first switch (Q1), adapted to be connected electrically to the electric power source (4), and causing said first switch (Q1) to conduct such that said first switch (Q1) makes the electrical circuit between said light emitting unit (1) and the electric power source (4) when the electric power source (4) provides the drive voltage (V1) to said first bias unit, thereby resulting in current flow from the electric power source (4) through said light emitting unit (1) and said first switch (Q1) to activate said light emitting unit (1),a second switch (Q2) connected electrically to said first switch (Q1), anda second bias unit connected electrically to said first and second switches (Q1, Q2), and causing said second switch (Q2) to conduct when amount of current flowing through said first switch (Q1) exceeds a predetermined threshold, wherein conduction of said second switch (Q2) forces said first switch (Q1) to turn off so as to break the electrical circuit between said light emitting unit (1) and the electric power source (4), thereby interrupting the current flow through said light emitting unit (1).
- The current-regulated light emitting device as claimed in claim 1, characterized in that:said first switch (Q1) has a first control end (G) connected electrically to said first bias unit, a first input end (D) connected electrically to said light emitting unit (1), and a first output end (S) connected electrically to said second bias unit; andsaid second switch (Q2) has a second control end (B) connected electrically to said first output end (S) and said second bias unit, a second input end (C) connected electrically to said first control end (G) and said first bias unit, and a second output end (E) connected electrically to said second bias unit.
- The current-regulated light emitting device as claimed in claim 2, characterized in that said first switch (Q1) is a metal-oxide-semiconductor field-effect transistor with a gate serving as said first control end (G), a drain serving as said first input end (D), and a source serving as said first output end (S).
- The current-regulated light emitting device as claimed in claims 2 or 3, characterized in that said second switch (Q2) is a bipolar junction transistor with a base serving as said second control end (B), a collector serving as said second input end (C), and an emitter serving as said second output end (E).
- The current-regulated light emitting device as claimed in claims 2, 3 or 4, characterized in that:said second bias unit includes a first resistor (R10) connected electrically at one end to said first output end (S) and said second control end (B) and further connected electrically at another end to said second output end (E), andsaid first bias unit includes a voltage divider connected electrically to said second output end (E) and adapted to be connected electrically to the electric power source (4), said voltage divider including series-connected second and third resistors (R20, R30), said first control end (G) and said second input end (C) being connected electrically to a junction of said second and third resistors (R20, R30).
- The current-regulated light emitting device as claimed in claim 5, further characterized by a brightness increasing unit (3) that includes a coupling resistor (R6) connected electrically to said current limiting unit (2), a third switch (Q3) connected electricallytosaidcoupling resistor (R6), and third bias unit connected electrically to said third switch (Q3) and adapted to receive a braking voltage (V2),said coupling resistor (R6) being connected electrically at one end to said first output end (S) and said second control end (B), and being further connected electrically at another end to said third switch (Q3),said third switch (Q3) having a third control end (G) connected electrically to said third bias unit, a third input end (D) connected electrically to said coupling resistor (R6), and a third output end (S) connected electrically to said second output end (E),said third bias unit causing said third switch (Q3) to conduct when the braking voltage (V2) is provided to said third bias unit such that said third switch (Q3) connects said coupling resistor (R6) in parallel to said first resistor (R10), thereby reconfiguring the predetermined threshold so as to allow a larger amount of current to flow through said light emitting unit (1) and said first switch (Q1) before said second switch (Q2) conducts.
- The current-regulated light emitting device as claimed in any one of the preceding claims, characterized in that said light emitting module (11) further has a current limiting resistor (R) adapted for connecting electrically said light emitting component (D1, D2) to the electric power source (4).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP08167800A EP2200403B1 (en) | 2008-10-29 | 2008-10-29 | Current-regulated light emitting device for vehicle use |
DE602008002336T DE602008002336D1 (en) | 2008-10-29 | 2008-10-29 | Current regulated light emitting device for use in the vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP08167800A EP2200403B1 (en) | 2008-10-29 | 2008-10-29 | Current-regulated light emitting device for vehicle use |
Publications (2)
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EP2200403A1 true EP2200403A1 (en) | 2010-06-23 |
EP2200403B1 EP2200403B1 (en) | 2010-08-25 |
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EP08167800A Active EP2200403B1 (en) | 2008-10-29 | 2008-10-29 | Current-regulated light emitting device for vehicle use |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2440018A1 (en) * | 2010-09-29 | 2012-04-11 | Rohm Co., Ltd. | Automobile LED driving device |
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2008
- 2008-10-29 EP EP08167800A patent/EP2200403B1/en active Active
- 2008-10-29 DE DE602008002336T patent/DE602008002336D1/en active Active
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US5765940A (en) * | 1995-10-31 | 1998-06-16 | Dialight Corporation | LED-illuminated stop/tail lamp assembly |
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EP2440018A1 (en) * | 2010-09-29 | 2012-04-11 | Rohm Co., Ltd. | Automobile LED driving device |
US8754592B2 (en) | 2010-09-29 | 2014-06-17 | Rohm Co., Ltd. | Automobile LED driving device |
US9148915B2 (en) | 2010-09-29 | 2015-09-29 | Rohm Co., Ltd. | Automobile LED driving device |
EP3626536A1 (en) * | 2010-09-29 | 2020-03-25 | Rohm Co., Ltd. | Automobile led driving device |
EP3741622A1 (en) * | 2010-09-29 | 2020-11-25 | Rohm Co., Ltd. | Automobile led driving device |
EP4046870A1 (en) * | 2010-09-29 | 2022-08-24 | Rohm Co., Ltd. | Automobile led driving device |
Also Published As
Publication number | Publication date |
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DE602008002336D1 (en) | 2010-10-07 |
EP2200403B1 (en) | 2010-08-25 |
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