CN1497509A - lighting circuit - Google Patents
lighting circuit Download PDFInfo
- Publication number
- CN1497509A CN1497509A CNA2003101010854A CN200310101085A CN1497509A CN 1497509 A CN1497509 A CN 1497509A CN A2003101010854 A CNA2003101010854 A CN A2003101010854A CN 200310101085 A CN200310101085 A CN 200310101085A CN 1497509 A CN1497509 A CN 1497509A
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- Prior art keywords
- light source
- source block
- light emitting
- switch
- emitting diode
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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
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in series in the vehicular lamp based on an instruction from the outside; a switching regulator for applying an output voltage based on a power-supply voltage output by an external DC power supply to the selected number of light-emitting diodes to be connected in series, so as to supply a supply current to the selected number of light-emitting diodes; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current.
Description
Technical field
The present invention relates to lamp circuit.The present invention be more particularly directed to lamp circuit that lamps apparatus for vehicle is lit a lamp.
Background technology
In the past, known switch regulator (for example, with reference to patent documentation 1) to the lamps apparatus for vehicle supply capability.The output voltage of switch regulator is for example controlled according to the electric current that flows through in the light source.
[patent documentation 1]
(Japan) spy opens 2001-215913 communique (the 3rd page, Fig. 7)
In vehicle, the strong beam that carries headlight with light source and low light level bundle with various light sources such as light sources.Therefore, when driving these multiple light sources, need independent switch regulator be set, the problem that exists cost to increase to each light source with switch regulator.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of lamp circuit that can solve above-mentioned problem.This purpose realizes by combination the application's independent technique scheme.In addition, subordinate technical scheme regulation more favourable concrete example of the present invention.
That is, according to first scheme of the present invention, provide a kind of lamp circuit that the lamps apparatus for vehicle of being furnished with a plurality of light emitting diodes is lit a lamp, it comprises: selection portion according to the indication from the outside, is chosen in the number of the light emitting diode that is connected in series in the lamps apparatus for vehicle; Switch regulator on the light emitting diode that is connected in series that will be applied to the number that selection portion selects based on the output voltage of the supply voltage of external dc power output, is supplied with corresponding light emitting diode with supplying electric current; And output control part, according to supplying electric current, control the output voltage of switch regulator.
In addition, lamps apparatus for vehicle comprises two light source blocks that are connected in series, each light source block has more than one light emitting diode, switch of two light source blocks of selection or select both by selection portion, be chosen in the number of the light emitting diode that is connected in series in the lamps apparatus for vehicle, lamp circuit also comprises switch in parallel with light source block and that be connected in series with another light source block, under the situation of not selecting a light source block, selection portion makes switch conduction, switch regulator when some light source blocks are selected, the supplying electric current that exportable size is roughly the same.
In addition, lamps apparatus for vehicle comprises two light source blocks that are connected in parallel, each light source block has the light emitting diode that is connected in series of different numbers separately, and selection portion can be chosen in the number of the light emitting diode that is connected in series in the lamps apparatus for vehicle by switching the some of a plurality of light source blocks.The number of the light emitting diode that is connected in series in light source block is less than the number of the light emitting diode that is connected in series in another light source block, lamp circuit also comprises the switch of connecting with a light source block and being connected in parallel with another light source block, when selecting a light source block, selection portion makes switch conduction.
According to the 2nd technical scheme of the present invention, a kind of lamp circuit is provided, is used to make the lamps apparatus for vehicle of being furnished with a plurality of light emitting diodes to light a lamp, this lamp circuit comprises: the transformer that comprises primary coil and secondary coil, wherein, primary coil is accepted the source current of external dc power output; And secondary coil is according to source current, and the output voltage that will be higher than supply voltage is applied on the light emitting diode, thereby supplying electric current is supplied with light emitting diode; Switch regulator with switching device is connected in series with the primary coil of transformer, carry out whether source current being offered primary coil repeat switch; And output control part, according to supplying electric current, by the conducting of control switching element or the time ratio that ends, thus the output voltage of control secondary coil.
Have, the summary of the invention described above is not enumerated all essential feature of the present invention again, and other combinations of these feature groups also belong to the present invention.
Description of drawings
Fig. 1 is the figure of a routine structure of the lamps apparatus for vehicle 10 of expression the present invention one routine embodiment.
Fig. 2 is the figure of the routine structure of expression light source block 58a, b, the routine structure of Fig. 2 (a) expression light source block 58a, another routine structure of Fig. 2 (b) expression light source block 58a, another example of Fig. 2 (c) expression light source block 58a, b structure.
Fig. 3 is the figure of another example of the circuit structure of expression lamps apparatus for vehicle 10.
Fig. 4 is the figure of another example of the circuit structure of expression lamps apparatus for vehicle 10.
Fig. 5 is the figure of another example of the circuit structure of expression lamps apparatus for vehicle 10.
Fig. 6 is the figure of another example of the circuit structure of expression lamps apparatus for vehicle 10.
Embodiment
Below, by embodiments of the present invention the present invention is described, but following embodiment is not to limit the related inventions of claims, and settling mode of the present invention does not need all combination of features of illustrating in the embodiment.
Fig. 1 represents structure one example of the lamps apparatus for vehicle 10 of the present invention's one routine embodiment.This routine lamps apparatus for vehicle 10 is optionally lit a lamp light emitting diode by being chosen in the number of the light emitting diode that is connected in series in the lamps apparatus for vehicle 10.Lamps apparatus for vehicle 10 comprises two light source block 58a, b and lamp circuit 102.Lamps apparatus for vehicle 10 also can comprise more light sources piece 58.Light source block 58a and light source block 58b are connected in series, and each have the more than one light emitting diode that is connected in series.And in this example, light source block 58a is the low light level bundle of headlight, and light source block 58b is a strong beam.
Here, strong beam switch 202a or the low light level bundle switch 202b of lamp circuit 102 by being arranged on lamps apparatus for vehicle 10 outsides, accept electric power from the direct supply 112 that is arranged on lamps apparatus for vehicle 10 outsides, this electric power is supplied with light source block 58a and/or light source block 58b.Each strong beam is the switch that whether provides the supply voltage of direct supply 112 outputs to switch regulator 114 according to switching from the indication of outside with switch 202b with switch 202a and low light level bundle.Each strong beam oppositely is connected the diode 124a, the b that protect usefulness with switch 202b by each with low light level bundle with switch 202a, is electrically connected with switch regulator 114.Strong beam for example is set on the driver's seat of vehicle with switch 202b with switch 202a and low light level bundle.
Light source selection portion 200 comprises PNP transistor 206, diode, a plurality of resistance and Zener diode.When strong beam ends with switch 202a, 206 conductings of PNP transistor, thus make switch 204 conductings.In this case, light source selection portion 200 makes positive pole and the negative pole short circuit of light source block 58b by switch 204, thereby selects the light source block 58a of two light source block 58a, b.
On the other hand, when strong beam was used switch 202a conducting, PNP transistor 206 ended, thereby switch 204 is ended.In this case, light source selection portion 200 does not make positive pole and the negative pole short circuit of light source block 58b by switch 204, thereby selects two light source block 58a, b both sides.That is, when not selecting light source block 58b, light source selection portion 200 makes switch 204 conductings.
Thus, light source selection portion 200 is switched or both sides that select two light source block 58a, b.Thus, light source selection portion 200 is chosen in the number of the light emitting diode that is connected in series in the lamps apparatus for vehicle 10 according to the indication from the outside.
Have, in this example, the base terminal of PNP transistor 206 is connected with pull down resistor, and is electrically connected with emitter terminal by resistance again.In addition, the collector terminal of PNP transistor 206 is connected with pull down resistor, and makes voltage by clamp by Zener diode.
In this example, high voltage output is offered the positive pole of light source block 58a, low-voltage is offered the negative pole of light source block 58b by resistance 118 by diode 134, thus this secondary coil output supplying electric current.Thus, switch regulator 114 is applied to output voltage on the light emitting diode that is connected in series of the number that light source selection portion 200 selects.And switch regulator 114 is supplied with these light emitting diodes with supplying electric current.
That is, when strong beam ended with switch 202a, switch regulator 114 was supplied with light source block 58a with supplying electric current.On the other hand, when strong beam was used switch 202a conducting, switch regulator 114 was supplied with light source block 58a, b both sides with supplying electric current.Have, switch regulator 114 also can be exported the roughly the same supplying electric current of size when having selected some light source blocks 58 again.In this case, can control switch regulator 114 simply.
In addition, in this example, switch regulator 114 is switch regulators of feedback system.In another example, switch regulator 114 also can be the switch regulator of other modes such as preposition mode or voltage-dropping type.Switch regulator 114 also can have the coil of the current supply light source block 58 that will accept from direct supply 112, replaces transformer 128.
Be connected in series with two light source block 58a, b respectively by resistance 118, produce the current detection voltage of conduct at its two ends based on the voltage of supplying electric current.Output control part 116 is according to this current detection voltage, by control nmos pass transistor 130 conductings or the time ratio that ends, thus the output voltage and the output current of control switch regulator 114.According to this example,, two light source block 58a, b are optionally lit a lamp by a switch regulator 114.Thus, can reduce the cost of lamps apparatus for vehicle 10.
Have, in another example, switch 204 also can be connected in parallel with light source block 58a, and is connected in series with light source block 58b again.In this case, the light source block 58b of one of them of 200 selections of light source selection portion two light source block 58a, b, or select two light source block 58a, b both sides.When light source selection portion 200 is used switch 202a conducting at strong beam, preferably select two light source block 58a, b both sides.
In another example, the ECU that carries on the vehicle (Electronics Control Unit; Electronic control unit) also can comprise light source selection portion 200 or have structure with light source selection portion 200 identical functions.In addition, lamp circuit 102 also can have the integrated circuit with light source selection portion 200 identical functions.
The routine structure of Fig. 2 (a) expression light source block 58a.In this example, light source block 58a has a plurality of light emitting diodes 30 that are connected in series.Each light emitting diode 30 comes luminous according to the supplying electric current that light source block 58a accepts.In another example, light source block 58a also can have a light emitting diode 30.In addition, light source block 58b also can have the structure identical with light source block 58a.
Another routine structure of Fig. 2 (b) expression light source block 58a.In this example, light source block 58a comprises a plurality of light source cells 60 that are connected in parallel.Each light source cell 60 comprises the more than one light emitting diode 30 that is connected in series.
Another example of Fig. 2 (c) expression light source block 58a, b structure.In this example, light source block 58a, b have the light emitting diode that is connected in series 30 of different numbers separately.In this example, the number of the light emitting diode 30 that is connected in series among the light source block 58a is less than the number of the light emitting diode 30 that is connected in series among the light source block 58b.Therefore, the forward bias voltage that produces in light source block 58a according to lighting a lamp of light emitting diode 30 is less than the forward bias voltage that produces on the light source block 58b.
Fig. 3 represents another example of the circuit structure of lamps apparatus for vehicle 10.In this example, lamp circuit 102 also comprises switch 230, a plurality of resistance and Zener diode.Switch 230 is nmos pass transistors, and 58a is connected in parallel with light source block, and is connected in series with light source block 58b.Therefore, when switch 230 conductings, with positive pole and the negative pole short circuit of light source block 58b.Have, the gate terminal of switch 230 is connected with pull down resistor again, and is connected by the negative electricity of Zener diode with light source block 58a.
In addition, light source selection portion 200 also comprises NPN transistor 224 and a plurality of resistance.PNP transistor 206 ends switch 230 when switch 204 conductings, when switch 204 is ended, makes switch 230 conductings.
Thus, light source selection portion 200 is according to the indication from the outside, selects a plurality of light source block 58a, b one or another.In this case, also can two light source block 58a, b optionally be lit a lamp by a switch regulator 114.Have again, except above-mentioned aspect, in Fig. 3, added with the structure 1 of Fig. 1 same numeral and have structure identical or same function, so omit explanation with Fig. 1.
Fig. 4 represents another example of the circuit structure of lamps apparatus for vehicle 10.In this example, light source block 58a and light source block 58b are connected in parallel.And light source block 58a, b have the identical structure of light source block 58a, b with the related explanation of Fig. 2 (c).
Therefore, when switch 204 conductings, switch regulator 114 is exported the corresponding output voltage of forward bias voltage that produces with light source block 58a.In this case, do not flow through supplying electric current in light source block 58b, switch regulator 114 is supplied with light source block 58a with supplying electric current.On the other hand, when switch 204 ends, in light source block 58a, do not flow through supplying electric current, so switch regulator 114 is supplied with light source block 58b with supplying electric current.In this case, switch regulator 114 is exported the corresponding output voltage of forward bias voltage that produces with light source block 58b.That is, in this example, light source selection portion 200 makes switch 204 conductings when selecting light source block 58a.
In this case, also can pass through a switch regulator 114, two light source block 58a, b selectivity are lit a lamp.Have again, except above-mentioned aspect, in Fig. 4, added with the structure of Fig. 1 same numeral and have structure identical or same function, so omit explanation with Fig. 1.
In another example, output control part 116 also can be according to the output voltage of switch regulator, control nmos pass transistor 130 conductings or the time ratio that ends.Output control part 116 preferably according to the state of strong beam with switch 202a, changes the output of switch regulator.
For example, when strong beam ended with switch 202a, output control part 116 was to the forward bias voltage corresponding output voltage of switch regulator 114 outputs with light source block 58a generation.In this case, switch regulator 114 is supplied with light source block 58a with supplying electric current.
And when strong beam was used switch 202a conducting, output control part 116 was to the forward bias voltage corresponding output voltage of switch regulator 114 outputs with light source block 58b generation.In this case, switch regulator 114 is supplied with light source block 58a, b both sides with supplying electric current.
Thus, switch regulator 114 is exported the corresponding supplying electric current of the number big or small and light source block of selecting 58.In this case, can pass through a switch regulator 114, former 58a of two light, b selectivity are lit a lamp.Have, the number of the light emitting diode 30 (with reference to Fig. 2) that is connected in series preferably also comprises the resistance that is connected in series with light emitting diode 30 than the light source block 58a that light source block 58b lacks again.
Fig. 5 represents another example of the circuit structure of lamps apparatus for vehicle 10.In Fig. 5, added with the structure of Fig. 4 same numeral and had structure identical or same function, so omit explanation with Fig. 4.In this example, light source block 58b is a low light level bundle, and light source block 58a is a strong beam.In this example, light source selection portion 200 offers strong beam the gate terminal of switch 204 with the voltage of the output terminal of switch 202a.
Therefore, when strong beam ended with switch 202a, switch regulator 114 was supplied with light source block 58b with supplying electric current.And when strong beam was used switch 202a conducting, switch regulator 114 was supplied with light source block 58a with supplying electric current.In this case, also can pass through a switch regulator 114, two light source block 58a, b selectivity are lit a lamp.According to this example, can reduce the component count of lamps apparatus for vehicle 10.
Fig. 6 represents another example of the circuit structure of lamps apparatus for vehicle 10.This routine lamps apparatus for vehicle 10 makes light emitting diode 30 with high efficiency light-emitting.In this example, lamps apparatus for vehicle 10 is furnished with a light source block 58, replaces light source block 58a, b.
Light source block 58 has the identical structure of light source block 58a with the related explanation of Fig. 2 (a).Light source block 58 also can have the identical structure of light source block 58b with the related explanation of Fig. 2 (b).The light source of afterbody Assembled lamps such as the high-mount stop lamp that this routine light source block 58 for example is a vehicle, side-marker lamp, brake lamp and/or afterbody fog lamp.
In this example, the switch regulator 114 outputs output voltage higher than supply voltage is so can increase the number of the light emitting diode that is connected in series 30 in the light source block 58.In this case, can reduce the supplying electric current of the light quantity of the light emitting diode 30 luminous regulations that are used to make defined amount.Thus, it is luminous that lamps apparatus for vehicle 10 can make light emitting diode 30 expeditiously.
Here, switch regulator 114 preferably boosts to supply voltage the roughly voltage below the 60V.In this case, for example, can provide safe and high efficiency lamps apparatus for vehicle 10 by danger such as reduction user electric shocks.Have again, except above-mentioned aspect, in Fig. 6, added with the structure of Fig. 1 same numeral and have structure identical or same function, so omit explanation with Fig. 1.
More than, with embodiment the present invention has been described, but technical scope of the present invention is not limited to the scope of above-mentioned embodiment record.In the above-described embodiment, can carry out numerous variations or improvement.Carry out such change or improved mode and be also contained in the technical scope of the present invention, the record of the scope of claim is clear and definite.
As seen from the above description, according to the present invention, can reduce the cost of lamps apparatus for vehicle.
Claims (5)
1. a lamp circuit is used to make the lamps apparatus for vehicle of being furnished with a plurality of light emitting diodes to light a lamp, and it is characterized in that this lamp circuit comprises:
Selection portion according to the indication from the outside, is chosen in the number of the described light emitting diode that is connected in series in the described lamps apparatus for vehicle;
Switch regulator on the described light emitting diode that is connected in series that will be applied to the described number that described selection portion selects based on the output voltage of the supply voltage of external dc power output, is supplied with corresponding light emitting diode with supplying electric current; And
Output control part according to described supplying electric current, is controlled the output voltage of described switch regulator.
2. lamp circuit as claimed in claim 1 is characterized in that:
Described lamps apparatus for vehicle comprises two light source blocks that are connected in series, and each light source block has more than one described light emitting diode;
Described selection portion is chosen in the number of the light emitting diode that is connected in series in the described lamps apparatus for vehicle by switching one of them or both sides of described two light source blocks;
Described lamp circuit also comprises and a described light source block parallel connection and the switch of connecting with another described light source block;
When not selecting a described light source block, described selection portion makes described switch conduction;
Described switch regulator is exported the roughly the same described supplying electric current of size under the situation of having selected any one described light source block.
3. lamp circuit as claimed in claim 1 is characterized in that:
Described lamps apparatus for vehicle comprises two light source blocks that are connected in parallel;
Each described light source block has the described light emitting diode that is connected in series of different numbers separately;
Described selection portion is selected the some of described a plurality of light source blocks by switching, and is chosen in the number of the light emitting diode that is connected in series in the described lamps apparatus for vehicle.
4. lamp circuit as claimed in claim 1 is characterized in that:
The number of the described light emitting diode that is connected in series in described light source block is less than the number of the described light emitting diode that is connected in series in another described light source block;
Described lamp circuit also comprises the switch of connecting with a described light source block and being connected in parallel with described another light source block;
When selecting a described light source block, described selection portion makes described switch conduction.
5. a lamp circuit is used to make the lamps apparatus for vehicle of being furnished with a plurality of light emitting diodes to light a lamp, and it is characterized in that this lamp circuit comprises:
The transformer that comprises primary coil and secondary coil, wherein, primary coil is accepted the source current of external dc power output;
And secondary coil is according to described source current, and the output voltage that will be higher than described supply voltage is applied on the described light emitting diode, thereby supplying electric current is supplied with described light emitting diode;
Switch regulator with switching device is connected in series with the described primary coil of described transformer, carry out whether described source current being offered described primary coil repeat switch; And
Output control part according to described supplying electric current, by the conducting of controlling described switching device or the time ratio that ends, thereby is controlled the output voltage of described secondary coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101010854A CN1497509A (en) | 2002-10-15 | 2003-10-14 | lighting circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP300962/2002 | 2002-10-15 | ||
| CNA2003101010854A CN1497509A (en) | 2002-10-15 | 2003-10-14 | lighting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1497509A true CN1497509A (en) | 2004-05-19 |
Family
ID=34256417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101010854A Pending CN1497509A (en) | 2002-10-15 | 2003-10-14 | lighting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1497509A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008061434A1 (en) * | 2006-11-21 | 2008-05-29 | Xiaoan Sun | An led bulb |
| CN101247687B (en) * | 2007-02-15 | 2012-11-14 | 株式会社小糸制作所 | Light emitting device |
| CN103148426A (en) * | 2011-12-06 | 2013-06-12 | 株式会社小糸制作所 | Vehicle lamp |
| CN103379709A (en) * | 2012-04-30 | 2013-10-30 | 三星电机株式会社 | Light emitting diode driving apparatus |
| CN103650640A (en) * | 2012-02-01 | 2014-03-19 | 欧司朗有限公司 | Circuit arrangement, lighting unit for a vehicle and method for driving semiconductor lighting elements |
| CN106060996A (en) * | 2015-04-07 | 2016-10-26 | 株式会社小糸制作所 | Lighting circuit |
| CN106102203A (en) * | 2015-04-29 | 2016-11-09 | 法雷奥照明公司 | The illuminator of many illumination functions of motor vehicles is implemented by function special light source group |
| CN113561887A (en) * | 2020-04-29 | 2021-10-29 | Sl株式会社 | Vehicle lamp |
-
2003
- 2003-10-14 CN CNA2003101010854A patent/CN1497509A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008061434A1 (en) * | 2006-11-21 | 2008-05-29 | Xiaoan Sun | An led bulb |
| CN101247687B (en) * | 2007-02-15 | 2012-11-14 | 株式会社小糸制作所 | Light emitting device |
| CN103148426A (en) * | 2011-12-06 | 2013-06-12 | 株式会社小糸制作所 | Vehicle lamp |
| CN103650640A (en) * | 2012-02-01 | 2014-03-19 | 欧司朗有限公司 | Circuit arrangement, lighting unit for a vehicle and method for driving semiconductor lighting elements |
| CN103650640B (en) * | 2012-02-01 | 2017-03-22 | 欧司朗有限公司 | Circuit arrangement, lighting unit for a vehicle and method for driving semiconductor lighting elements |
| CN103379709A (en) * | 2012-04-30 | 2013-10-30 | 三星电机株式会社 | Light emitting diode driving apparatus |
| CN106060996A (en) * | 2015-04-07 | 2016-10-26 | 株式会社小糸制作所 | Lighting circuit |
| US9992835B2 (en) | 2015-04-07 | 2018-06-05 | Koito Manufacturing Co., Ltd. | Lighting circuit |
| CN106102203A (en) * | 2015-04-29 | 2016-11-09 | 法雷奥照明公司 | The illuminator of many illumination functions of motor vehicles is implemented by function special light source group |
| CN106102203B (en) * | 2015-04-29 | 2020-03-17 | 法雷奥照明公司 | Lighting device for implementing multiple lighting functions of motor vehicle by using function-specific light source group |
| CN111315070A (en) * | 2015-04-29 | 2020-06-19 | 法雷奥照明公司 | Lighting device for implementing multiple lighting functions of motor vehicle by using function-specific light source group |
| CN113561887A (en) * | 2020-04-29 | 2021-10-29 | Sl株式会社 | Vehicle lamp |
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