JPH0347930Y2 - - Google Patents
Info
- Publication number
- JPH0347930Y2 JPH0347930Y2 JP1984135065U JP13506584U JPH0347930Y2 JP H0347930 Y2 JPH0347930 Y2 JP H0347930Y2 JP 1984135065 U JP1984135065 U JP 1984135065U JP 13506584 U JP13506584 U JP 13506584U JP H0347930 Y2 JPH0347930 Y2 JP H0347930Y2
- Authority
- JP
- Japan
- Prior art keywords
- series
- circuit
- parallel
- light source
- switching
- 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.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
Description
【考案の詳細な説明】
〔技術分野〕
本考案は、多数の発光ダイオードを光源とする
車両用灯具の駆動回路に関するものである。[Detailed Description of the Invention] [Technical Field] The present invention relates to a drive circuit for a vehicle lamp using a large number of light emitting diodes as a light source.
車両用灯具、例えばテール・ストツプランプの
光源としては、主に白熱電球が使用されている
が、フイラメント断線のおそれがある白熱電球の
代わりに発光ダイオードを用いることが考えられ
ている。
Although incandescent light bulbs are mainly used as light sources for vehicle lamps, such as tail stop lamps, it is being considered to use light emitting diodes instead of incandescent light bulbs, which have the risk of filament breakage.
本考案の目的は、簡単な回路構成でストツプ表
示とテール表示を明確に区別できる車両用灯具の
駆動回路を提供することにある。
An object of the present invention is to provide a drive circuit for a vehicle lamp that can clearly distinguish between a stop display and a tail display with a simple circuit configuration.
本考案は、多数の発光ダイオードを直並列接続
して光源とした車両用灯具において、前記各列に
夫々介在させた電流制限抵抗と、一定比率の抵抗
値とした２個の光度切換え抵抗と、これら両光度
切換え抵抗をストツプ表示時には並列に、テール
表示時には直列に切換えるスイツチング回路とを
備え、前記電流制限抵抗をいずれの切換において
も閉ループ内に接続したことを特徴とするもので
ある。
The present invention provides a vehicle lamp in which a large number of light emitting diodes are connected in series and parallel as a light source, and includes a current limiting resistor interposed in each row, and two luminous intensity switching resistors each having a resistance value of a fixed ratio. The present invention is characterized in that it is equipped with a switching circuit that switches both of these luminous intensity switching resistors in parallel for a stop display and in series for a tail display, and that the current limiting resistor is connected in a closed loop in either switching.
第１図は本考案の一実施例を示すもので、Ａは
多数の発光ダイオードLEDを直並列接続した光
源であり、例えば４個の発光ダイオードLEDと
電流制限抵抗R0の直列回路を所要数並列接続し
た構成としている。Ｂはバツテリー、Ｓは３極双
投形のスイツチ、R1及びR2は光度切換え抵抗で
テール時とストツプ時の光度比が１：５となるよ
うな比率の抵抗値とし、前記スイツチＳによりテ
ール時には直列、ストツプ時には並列にして前記
光源ＡとバツテリーＢの間に介在させるようにし
ている。
Fig. 1 shows an embodiment of the present invention, where A is a light source in which a large number of light emitting diodes LED are connected in series and parallel, for example, a series circuit of four light emitting diodes LED and a current limiting resistor R 0 is connected as required. The configuration is connected in parallel. B is a battery, S is a three-pole double-throw switch, R 1 and R 2 are luminous intensity switching resistors, and the resistance values are such that the luminous intensity ratio at tail and stop times is 1:5. They are interposed between the light source A and the battery B so that they are connected in series at tail time and in parallel at stop time.
前記スイツチＳを図示状態となるように操作し
た場合には抵抗R1，R2は並列となり、そのとき
の回路は第２図に示すようになる。バツテリーＢ
の電圧をＶ、回路に流れる全電流をI1、光源Ａに
加わる電圧をVP、光源Ａを構成する各LED直列
回路に流れる電流をIP、並列接続するLED直列回
路の数をｎ、各LED直列に接続される電流制限
抵抗をR0とすると、
Ｖ＝R1・R2／R1＋R2I1＋R0IP＋VP
I1＝ｎ・IPであるから
Ｖ＝（nR1・R2／R1＋R2）IP＋VP
従つて
IP＝Ｖ−VP／（nR1・R2／R1＋R2＋R0）
となる。 When the switch S is operated as shown in the figure, the resistors R 1 and R 2 are connected in parallel, and the circuit at that time becomes as shown in FIG. 2. Battery B
The voltage of is V, the total current flowing through the circuit is I 1 , the voltage applied to light source A is V P , the current flowing through each LED series circuit making up light source A is I P , the number of LED series circuits connected in parallel is n, If the current limiting resistor connected in series with each LED is R 0 , then V=R 1・R 2 /R 1 +R 2 I 1 +R 0 I P +V P I 1 =n・I P , so V=(nR 1・R 2 /R 1 +R 2 )I P +V P Therefore, I P =V−V P /(nR 1・R 2 /R 1 +R 2 +R 0 ).
一方、前記スイツチＳを図示と反対側に切換え
ると、抵抗R1，R2は直列となり、そのときの回
路は第３図に示すようになる。この場合、回路に
流れる全電流をI2、光源Ａに加わる電圧をVS、光
源Ａを構成する各LED直列回路に流れる電流をIS
とすると、
Ｖ＝（R1＋R2）I2＋R0IS＋VS
I2＝ｎ・ISであるから
Ｖ＝｛ｎ（R1＋R2）＋R0｝IS＋VS
従つて
IS＝Ｖ−VS／｛ｎ（R1＋R2）＋R0
となる。 On the other hand, when the switch S is switched to the opposite side from that shown, the resistors R 1 and R 2 are connected in series, and the circuit at that time becomes as shown in FIG. 3. In this case, the total current flowing through the circuit is I 2 , the voltage applied to light source A is V S , and the current flowing through each LED series circuit making up light source A is I S
Then, since V=(R 1 +R 2 )I 2 +R 0 I S +V S I 2 =n・I S , V={n(R 1 +R 2 )+R 0 }I S +V S Therefore, I S =V−V S /{n(R 1 +R 2 )+R 0 .
ここでVP＝VSならば各々のLED直列回路に流
れる電流IPとISの比は、
IP／IS＝ｎ（R1＋R2）＋R0／nR1・R2／R1＋R2＋R0
＝ｎ（R1＋R2）2＋R0（R1＋R2）／nR1・R2＋R0（R1＋
R2）
で表わされる。 Here, if V P = V S , the ratio of the currents I P and I S flowing through each LED series circuit is I P /I S =n (R 1 + R 2 ) + R 0 /nR 1・R 2 /R 1 +R 2 +R 0 =n(R 1 +R 2 ) 2 +R 0 (R 1 +R 2 )/nR 1・R 2 +R 0 (R 1 +
R 2 ).
従つてIP：IS＝５：１、ｎ＝20、R0＝100Ωと設
定すれば
５／１＝20（R1＋R2）2＋100（R1＋R2）／20R1・R2）
＋100（R1＋R2）
20（R1＋R2）2＋100（R1＋R2
＝５｛20R1・R2 2＋100（R1＋R2）｝
５（R1＋R2）2−25R1・R2
−100（R1＋R2）＝０
R2 1＋2R1・R2＋R2 2−5R1
・R2−20（R1＋R2）＝０
R2 1−（3R2＋20）R1＋R2 2−20R2＝０
ゆえに
R1＝3R2＋20±√（3R2＋20）2−４（R2／2−20R2
）／２
＝3R2＋20±√5R2／2＋200R2＋400／２
となり、この式からR2＝20Ωの場合は
R1＝80Ω（又は0Ω）となる。 Therefore, if I P :I S =5:1, n=20, and R0 =100Ω, then 5/1=20( R1 + R2 ) 2 +100( R1 + R2 )/ 20R1・R2 )
+100(R 1 +R 2 ) 20(R 1 +R 2 ) 2 +100(R 1 +R 2 = 5 {20R 1・R 2 2 +100(R 1 +R 2 )} 5(R 1 +R 2 ) 2 −25R 1・R 2 −100(R 1 +R 2 )=0 R 2 1 +2R 1・R 2 +R 2 2 −5R 1・R 2 −20 (R 1 +R 2 )=0 R 2 1 −(3R 2 +20) R 1 +R 2 2 −20R 2 =0 Therefore, R 1 =3R 2 +20±√(3R 2 +20) 2 −4(R 2 / 2 −20R 2
)/2 = 3R 2 +20±√5R 2 / 2 +200R 2 +400/2, and from this formula, when R 2 = 20Ω, R 1 = 80Ω (or 0Ω).
従つて、電流IPと電流ISの比率が５：１以上に
なるように抵抗R1，R2の値を選定すれば、光源
Ａの電流は並列時（ストツプ時）の方が多くな
り、ストツプ時とテール時の光度比が５：１以上
となる。 Therefore, if the values of resistors R 1 and R 2 are selected so that the ratio of current I P to current I S is 5:1 or more, the current of light source A will be larger when they are paralleled (when stopped). , the luminous intensity ratio between stop and tail is 5:1 or more.
以上のように本考案によれば、所定比率の抵抗
値とした２個の光度切換え抵抗をスイツチング回
路により直列と並列に接続変更して発光ダイオー
ドよりなる光源に流れる電流を所定比率で変化さ
せるようにしたので、ストツプ表示とテール表示
を明確に区別できる。しかも、白熱電球と異なり
多数の発光ダイオードを直並列接続した灯具であ
つても、各列に接続した電流制限抵抗によりスト
ツプ表示の場合でもテール表示の場合でも、夫々
に対応した明るさで発光面を均等に光輝させるこ
とができること等の種々の優れた効果を奏する。
As described above, according to the present invention, two light intensity switching resistors each having a resistance value of a predetermined ratio are connected in series and in parallel using a switching circuit to change the current flowing through a light source made of a light emitting diode at a predetermined ratio. , the stop display and tail display can be clearly distinguished. Moreover, unlike incandescent light bulbs, even if the light fixture has a large number of light emitting diodes connected in series and parallel, the current limiting resistor connected to each row allows the light emitting surface to be adjusted to the appropriate brightness, whether in stop display or tail display. It has various excellent effects such as being able to make it shine evenly.
第１図は本考案に係る車両用灯具の駆動回路の
一実施例を示す回路図、第２図及び第３図はスト
ツプ時及びテール時の回路図である。
Ａ……光源、Ｂ……バツテリー、LED……発
光ダイオード、Ｓ……スイツチ、R0……電流制
限抵抗、R1，R2……光度切換え抵抗、IP……並
列結線時にLED直列回路に流れる電流、IS……直
列結線等にLED直列回路に流れる電流、I1……並
列結線時の全回路電流、I2……直列結線時の全回
路電流、VP並列結線時に光源Ａにかかる電圧VS
……直列結線時に光源Ａにかかる電圧。
FIG. 1 is a circuit diagram showing an embodiment of a driving circuit for a vehicle lamp according to the present invention, and FIGS. 2 and 3 are circuit diagrams at stop and tail times. A...Light source, B...Battery, LED...Light emitting diode, S...Switch, R0 ...Current limiting resistor, R1 , R2 ...Intensity switching resistor, I P ...LED series circuit when connected in parallel I S ... Current flowing in the LED series circuit when connected in series, I 1 ... Total circuit current when connected in parallel, I 2 ... Total circuit current when connected in series, V P Light source A when connected in parallel The voltage applied to V S
...Voltage applied to light source A when connected in series.
Claims (1)
した車両用灯具において、前記各列に夫々介在さ
せた電流制限抵抗と、一定比率の抵抗値とした２
個の光度切換え抵抗と、これら両光度切換え抵抗
をストツプ表示時には並列に、テール表示時には
直列に切換えるスイツチング回路とを備え、前記
電流制限抵抗をいずれの切換においても閉ループ
内に接続したことを特徴とする車両用灯具の駆動
回路。 In a vehicle lamp in which a large number of light emitting diodes are connected in series and parallel as a light source, a current limiting resistor is provided in each row, and a resistance value of a constant ratio is set to 2.
The current limiting resistor is connected in a closed loop in both cases of switching, and a switching circuit that switches these two brightness switching resistors in parallel for a stop display and in series for a tail display. Drive circuit for vehicle lighting equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984135065U JPH0347930Y2 (en) | 1984-09-05 | 1984-09-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984135065U JPH0347930Y2 (en) | 1984-09-05 | 1984-09-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6148835U JPS6148835U (en) | 1986-04-02 |
| JPH0347930Y2 true JPH0347930Y2 (en) | 1991-10-14 |
Family
ID=30693566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984135065U Expired JPH0347930Y2 (en) | 1984-09-05 | 1984-09-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0347930Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3488958B2 (en) * | 1998-06-22 | 2004-01-19 | 常盤電業株式会社 | Traffic light |
-
1984
- 1984-09-05 JP JP1984135065U patent/JPH0347930Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6148835U (en) | 1986-04-02 |
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