JP2003317978A - Lighting circuit for on-vehicle led lighting fixture - Google Patents
Lighting circuit for on-vehicle led lighting fixtureInfo
- Publication number
- JP2003317978A JP2003317978A JP2002117683A JP2002117683A JP2003317978A JP 2003317978 A JP2003317978 A JP 2003317978A JP 2002117683 A JP2002117683 A JP 2002117683A JP 2002117683 A JP2002117683 A JP 2002117683A JP 2003317978 A JP2003317978 A JP 2003317978A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- lighting
- light source
- vehicle
- lamp
- 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.)
- Pending
Links
Landscapes
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、LEDランプを光
源として採用した車両用灯具に係るものであり、詳細に
は、リアコンビネーションランプなど信号用の灯具にお
いて、光源として複数のLEDランプを採用した車載用
LED灯具における点灯回路の構成に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp that uses an LED lamp as a light source. More specifically, in a signal lamp such as a rear combination lamp, a plurality of LED lamps are used as a light source. The present invention relates to a configuration of a lighting circuit in an on-vehicle LED lighting device.
【0002】[0002]
【従来の技術】従来のこの種の車載用LED灯具におけ
る点灯回路の例を示すものが図6および図7であり、図
6に示す車載用LED灯具の点灯回路90は、直流であ
る車両の電源で直接に点灯させるものであり、例えば直
列方向には4個、並列方向には5個のLEDランプ91
aがマトリクス状に接続されて光源部91が形成され、
この光源部91はストップ点灯用抵抗器92を介してス
トップ端子Sに接続されると共にテール点灯用抵抗器9
3を介してテール端子Tに接続されている。2. Description of the Related Art FIGS. 6 and 7 show an example of a lighting circuit in a conventional vehicle-mounted LED lamp, and a lighting circuit 90 of the vehicle-mounted LED lamp shown in FIG. It is directly lit by a power source, for example, four LED lamps 91 in the series direction and five LED lamps 91 in the parallel direction.
a are connected in a matrix to form the light source unit 91,
The light source unit 91 is connected to the stop terminal S via the stop lighting resistor 92 and the tail lighting resistor 9 is connected.
It is connected to the tail terminal T via 3.
【0003】加えて、車両電源の異常な上昇に備えて、
前記光源部91と、ストップ点灯用抵抗器92およびテ
ール点灯用抵抗器93との間には過電圧対策用抵抗器9
4が直列に接続されており、この過電圧対策用抵抗器9
4は通常の状態では短路スイッチ95により短絡されて
いる。また、点灯回路90には逆接防止用ダイオード9
6、サージ防止用ツェナーダイオード97も設けられて
いる。In addition, in preparation for an abnormal increase in vehicle power supply,
Between the light source unit 91 and the stop lighting resistor 92 and the tail lighting resistor 93, an overvoltage countermeasure resistor 9 is provided.
4 are connected in series, and this overvoltage countermeasure resistor 9
4 is short-circuited by the short circuit switch 95 in a normal state. Further, the reverse connection prevention diode 9 is provided in the lighting circuit 90.
6. A Zener diode 97 for surge prevention is also provided.
【0004】そして、前記ストップ点灯用抵抗器92に
はストップランプとして前記光源部91を点灯させるの
に適切な抵抗値が設定され、テール点灯用抵抗器93に
はテールランプとして点灯させるのに適切な抵抗値が設
定されている。また、前記過電圧対策用抵抗器94に
は、例えばバッテリーの接続外れなどにより車両用電源
に高電圧が生じた際には短路スイッチ95を開放するこ
とにより光源部91を損傷することのないものとする抵
抗値が設定されている。A resistance value suitable for lighting the light source unit 91 as a stop lamp is set in the stop lighting resistor 92, and a tail resistance suitable for lighting the tail lighting resistor 93 as a tail lamp. The resistance value is set. In addition, the overvoltage countermeasure resistor 94 does not damage the light source unit 91 by opening the short circuit switch 95 when a high voltage is generated in the vehicle power source due to disconnection of the battery or the like. The resistance value to be set is set.
【0005】図7に示す点灯回路80は、車両用電源に
DC/DCコンバータを介在させ、その出力を光源部8
1に印加することでテールランプ時にもストップランプ
時にも適正な電流を供給し所定の明るさを得ようとする
ものであり、先ず、光源部81は、例えばLEDランプ
81aの4個が直列接続されたランプ列81bが5列並
列接続されて形成され、それぞれの直列接続されたもの
には電流検出器81cが接続されている。また、この光
源部81には、高速ダイオード82a、コイル82b、
コンデンサ82cで成る平滑回路82に接続されてい
る。A lighting circuit 80 shown in FIG. 7 has a DC / DC converter interposed in a vehicle power source and outputs the output from the light source section 8.
When the tail lamp and the stop lamp are applied, an appropriate current is supplied to obtain a predetermined brightness by applying the voltage to the light source 1. First, the light source unit 81 includes, for example, four LED lamps 81a connected in series. 5 lamp rows 81b are connected in parallel, and a current detector 81c is connected to each connected in series. Further, the light source unit 81 includes a high speed diode 82a, a coil 82b,
It is connected to a smoothing circuit 82 formed of a capacitor 82c.
【0006】また、前記平滑回路82には、制御回路8
3aおよび出力トランジスタ83bとから成る定電流回
路83が接続され、該定電流回路83は前記電流検出器
81cからの信号により前記光源部81に流れる電流が
一定電流となるように、電源電圧のパルス幅制御などに
より制御する。また、前記定電流回路83にはストップ
端子Sからの信号も入力され、テールランプ、ストップ
ランプそれぞれに適する光量に切換えるものとされてい
る。Further, the smoothing circuit 82 includes a control circuit 8
3a and an output transistor 83b are connected to a constant current circuit 83. The constant current circuit 83 uses a pulse of the power supply voltage so that the current flowing through the light source unit 81 becomes a constant current by the signal from the current detector 81c. It is controlled by width control. Further, a signal from the stop terminal S is also input to the constant current circuit 83, and the light amount is switched to an amount suitable for each of the tail lamp and the stop lamp.
【0007】[0007]
【発明が解決しようとする課題】しかしながら、図6に
示した点灯回路90においては、ストップ点灯抵抗器9
2、テール点灯用抵抗器93など抵抗器に消費される電
力が多くなり、特に車両用電源の電圧が高い場合には、
光源部91に消費される電力と同等の以上の電力が抵抗
器で消費され、効率が悪いものとなる問題点を生じてい
る。また、LEDランプ91aがマトリックス接続され
ていることで、一部のLEDランプ91aに断線を生じ
た場合の検出手段がなく、複数の光源中の一部の断線に
より規定照度が得られないときには消灯しなければなら
ないとする欧州規格に合致させることが困難である問題
点も生じている。However, in the lighting circuit 90 shown in FIG. 6, the stop lighting resistor 9 is used.
2. The power consumed by the resistors such as the tail lighting resistor 93 increases, and especially when the voltage of the vehicle power source is high,
Electric power equal to or more than the electric power consumed by the light source unit 91 is consumed by the resistor, which causes a problem of low efficiency. In addition, since the LED lamps 91a are connected in a matrix, there is no detection means for the case where some of the LED lamps 91a are disconnected, and when the specified illuminance cannot be obtained due to some of the plurality of light sources, the light is turned off. There is also the problem that it is difficult to meet the European standards that must be met.
【0008】さらに、マトリクス接続をして1個の断線
で他のLEDランプ91aが消えないものとする際に
は、LEDランプ91aの1個が断線しても明るさを維
持できるものとし、欧州規格などに適合できるものとす
るために、1個のLEDランプ91aの全体の照度に対
する占める割合を減らし、影響を少ないものとしておく
必要があり、よって、LEDランプ91aの使用数が増
加しコストアップする問題点も生じている。Further, when the matrix connection is performed so that the other LED lamps 91a cannot be extinguished by one disconnection, the brightness can be maintained even if one of the LED lamps 91a is disconnected. In order to comply with the standards, it is necessary to reduce the ratio of one LED lamp 91a to the total illuminance so as to reduce the influence. Therefore, the number of LED lamps 91a used increases and the cost increases. There is also a problem.
【0009】また、図7に示した点灯回路80において
は、コイル82b(インダクタンス)を含む平滑回路8
2に断続波形を印加するものであるので、インダクタン
スの逆起電力によりノイズを発生しやすいものとなり、
例えばカーラジオなどの雑音発生源となるので、その対
策に手間とコストがかかり、点灯回路80全体がコスト
アップする問題点を生じていた。Further, in the lighting circuit 80 shown in FIG. 7, the smoothing circuit 8 including the coil 82b (inductance).
Since the intermittent waveform is applied to 2, noise is easily generated due to the back electromotive force of the inductance,
For example, since it becomes a noise source of a car radio and the like, it takes time and cost to take measures against it, and there is a problem that the cost of the entire lighting circuit 80 increases.
【0010】[0010]
【課題を解決するための手段】本発明は、前記した従来
の課題を解決するための具体的手段として、光源に複数
のLEDランプを使用した車載用LED灯具の点灯回路
において、前記点灯回路は、少なくとも1個のLEDラ
ンプからなるランプ列と電流制限抵抗とが前記電流制限
抵抗を接地側として直列に接続された組立列の1列、も
しくは、複数列が並列に接続された光源部と、この車載
用LED灯具の入力側に与えられる信号によりデューテ
ィ比を可変するPWM制御回路部と、前記光源部の電源
側もしくは接地側に接続され前記PWM制御回路部から
の出力に基づいて前記光源部に加えられる電源のデュー
ティ比を制御するスイッチング回路部とから構成されて
いることを特徴とする車載用LED灯具の点灯回路を提
供することで課題を解決するものである。As a concrete means for solving the above-mentioned conventional problems, the present invention provides a lighting circuit of an on-vehicle LED lighting device using a plurality of LED lamps as a light source, wherein the lighting circuit is A column of lamps including at least one LED lamp and a current limiting resistor connected in series with the current limiting resistor on the ground side, or a light source unit in which a plurality of columns are connected in parallel. A PWM control circuit unit for varying the duty ratio by a signal given to the input side of this vehicle-mounted LED lamp, and the light source unit connected to the power source side or the ground side of the light source unit based on the output from the PWM control circuit unit. To provide a lighting circuit for a vehicle-mounted LED lamp, which is configured by a switching circuit unit that controls a duty ratio of a power source applied to the vehicle. It is intended to resolve.
【0011】[0011]
【発明の実施の形態】つぎに、本発明を図に示す実施形
態に基づいて詳細に説明する。図1に符号1で示すもの
は本発明に係る車載用LED灯具の点灯回路であり、こ
の点灯回路1は、ストップランプ機能とテールランプ機
能とが要求されるものであり、また、LEDランプ2a
の1個もしくは複数が接続されたランプ列2bの1列以
上で光源部2が設けられ、該光源部2に印加する電流量
の可変により光量を増減し、上記した2つの機能を切換
えるものである点は従来例のものと同様である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on the embodiments shown in the drawings. Reference numeral 1 in FIG. 1 is a lighting circuit for an on-vehicle LED lighting device according to the present invention. The lighting circuit 1 is required to have a stop lamp function and a tail lamp function, and also has an LED lamp 2a.
The light source section 2 is provided in one or more rows of the lamp row 2b to which one or more of the above are connected, and the light quantity is increased / decreased by changing the amount of current applied to the light source section 2 to switch the above two functions. Some points are the same as those of the conventional example.
【0012】先ず、前記光源部2は、LEDランプ2a
の4個が直列に接続されたランプ列2bが5列並列に接
続されて構成されるものであり、それぞれの列2bに対
しては電流制限抵抗3が直列に接続されて組立列2cが
構成され、前記電流制限抵抗3の両端に生じる電位を持
って各列に電流が流れていることを検知できるものとさ
れている。また、前記電流制限抵抗3のアース側の端子
は全てが接続され、例えばNPNトランジスタであるス
イッチング回路部4を介してGNDに接地されている。First, the light source unit 2 includes an LED lamp 2a.
4 are connected in series, and five lamp rows 2b are connected in parallel, and a current limiting resistor 3 is connected in series to each row 2b to form an assembly row 2c. The current flowing in each column can be detected with the potential generated at both ends of the current limiting resistor 3. Further, all the terminals on the ground side of the current limiting resistor 3 are connected to each other, and are grounded to GND via the switching circuit section 4 which is, for example, an NPN transistor.
【0013】本発明の点灯回路1ではPWM制御回路部
5が設けられるものであり、このPWM制御回路部5は
原理的には直流チョッパであり、テール端子Tのみに入
力がある場合には車両用電源を、図2に電圧Tvで示す
ように例えば1/10デューテイにチョッピングし、ス
トップ端子に入力があるときには図3に電圧Svで示す
ようにチョッピングを停止する。そして、前記PWM制
御回路部5からの出力は前記スイッチング回路部4、具
体的にはトランジスタQ1のベースに入力されている。The lighting circuit 1 of the present invention is provided with a PWM control circuit section 5. This PWM control circuit section 5 is a DC chopper in principle, and when there is an input only at the tail terminal T, the vehicle is The power supply for use is chopped to, for example, 1/10 duty as shown by voltage Tv in FIG. 2, and when there is an input at the stop terminal, chopping is stopped as shown by voltage Sv in FIG. The output from the PWM control circuit unit 5 is input to the switching circuit unit 4, specifically, the base of the transistor Q1.
【0014】また、本発明では前記PWM制御回路部5
を車両用電源の変動にも対応させるものであり、この実
施形態では前記PWM制御回路部5の前段には入力電圧
検出回路5aが設けられ、車両用電源に電圧の上昇を生
じたときには、図4に電圧Shで示すように適宜なデュ
ーテイによりチョッピングを開始し、消費電流量の多い
ストップランプ動作時のLEDランプ2aおよび電流制
限抵抗3に過剰な電流が流れるのを防止する。In the present invention, the PWM control circuit section 5
In this embodiment, an input voltage detection circuit 5a is provided in the preceding stage of the PWM control circuit unit 5, and when the voltage rises in the vehicle power supply, 4, chopping is started with an appropriate duty as indicated by voltage Sh to prevent an excessive current from flowing through the LED lamp 2a and the current limiting resistor 3 during the operation of the stop lamp which consumes a large amount of current.
【0015】尚、この実施形態では前記入力電圧検出回
路5aはストップ端子Sに接続され、ストップランプと
して動作しているときのみPWM制御回路部5により電
源電圧が上昇したときの電流調整が行なわれるものとな
っているが、前記入力電圧検出回路5aはテール端子T
側に接続しテール動作時、ストップ動作時の全ての状態
で電流調整を行うものとしても良い。In this embodiment, the input voltage detection circuit 5a is connected to the stop terminal S, and the PWM control circuit section 5 adjusts the current when the power supply voltage rises only when operating as a stop lamp. The input voltage detection circuit 5a has a tail terminal T
It may be connected to the side and current adjustment may be performed in all states during tail operation and stop operation.
【0016】上記に加えて、本発明では欧州規格にも対
応可能とするものであり、前記光源部2の各列それぞれ
に接続されている電流制限抵抗3に生じる電位について
検証すれば、前記スイッチング回路部4(トランジスタ
Q1)が導通している状態で、且つ、直列に接続された
4個のLEDランプ2aに断線を生じていなければ、L
EDランプ2aと電流制限抵抗3との接続点Pにおける
電位は“H”であり、何れかのLEDランプ2aに断線
を生じれば、同じ接続点Pにおける電位は“L”とな
る。In addition to the above, the present invention can also comply with the European standard, and if the potential generated in the current limiting resistor 3 connected to each column of the light source section 2 is verified, the switching is performed. If the circuit portion 4 (transistor Q1) is in the conductive state and the four LED lamps 2a connected in series are not broken, L
The potential at the connection point P between the ED lamp 2a and the current limiting resistor 3 is "H", and if a disconnection occurs in any of the LED lamps 2a, the potential at the same connection point P becomes "L".
【0017】従って、前記スイッチング回路部4の導通
時にそれぞれの列のP点電位を計測し、何れかにでも
“L”電位のものを生じていれば、その列には断線した
LEDランプ2aが含まれていることが予測されるの
で、このような場合には、断線検出回路6の出力を持っ
て前記PWM制御回路部5からスイッチング回路部4へ
の信号を停止させ、光源部2の点灯を停止させる。Therefore, when the switching circuit section 4 is turned on, the potential at the point P of each column is measured. If any of the potentials of "L" potential is generated, the disconnected LED lamp 2a is present in that column. Since it is predicted that it is included, in such a case, the signal from the PWM control circuit unit 5 to the switching circuit unit 4 is stopped by holding the output of the disconnection detection circuit 6 to turn on the light source unit 2. To stop.
【0018】尚、図中に符号7で示すものは、ストップ
端子Sおよびテール端子Tに車両用電源が極性を誤って
接続されたときにも、光源部2、PWM制御回路部5な
どに破損を生じないために設けられる逆接防止ダイオー
ドであり、また、符号8で示すものは車両用電源側から
入り込む可能性が高いサージ電圧を防止するためのサー
ジ防止用ツェナーダイオードである。The reference numeral 7 in the figure damages the light source unit 2, the PWM control circuit unit 5, etc. even when the vehicle power source is connected to the stop terminal S and the tail terminal T with the wrong polarity. Is a reverse connection prevention diode provided to prevent the occurrence of a surge voltage, and a reference numeral 8 is a surge prevention zener diode for preventing a surge voltage which is likely to enter from the vehicle power source side.
【0019】次いで、上記の構成とした本発明の点灯回
路1の作用および効果について説明を行なう。先ず、電
圧の変動を生じやすい車両用電源で光源部2を点灯させ
るに際して、電流制限抵抗3とPWM制御回路部5とで
行なうものとしたことで、先ず電流制限抵抗3側におい
ては、テールランプ点灯時とストップランプ点灯時との
共に、それぞれにほぼ適性となる電力量がPWM制御回
路部5から供給されるものとなるので、電流制限抵抗3
における負担は低減されると共に、同じの電流制限抵抗
3でテールランプ点灯時、ストップランプ点灯時共に兼
用できるものとなる。また、LEDランプ2aにおいて
もマトリクス状の配線を行なわず単なる直列接続で良い
ものとなる。Next, the operation and effect of the lighting circuit 1 of the present invention having the above structure will be described. First, when the light source unit 2 is turned on by the vehicle power source in which voltage fluctuations are likely to occur, the current limiting resistor 3 and the PWM control circuit unit 5 are used. Since the PWM control circuit unit 5 supplies electric power that is approximately suitable for both the time and the stop lamp lighting, the current limiting resistor 3
In addition to reducing the load on the vehicle, the same current limiting resistor 3 can be used for both the tail lamp lighting and the stop lamp lighting. Also, in the LED lamp 2a, it is sufficient to simply connect in series without wiring in a matrix.
【0020】このことは、電流制限抵抗3をテールラン
プ点灯用とストップランプ点灯用との二種類を用意しな
くとも良いものとなり、部品点数低減によるコストダウ
ンも可能となると共に、この電流制限抵抗3における消
費電力も少ないものとして、小型化、および、車両用灯
具全体としての発熱を低減する。また、LEDランプ2
aの列毎の断線が検出できるものとなるので、欧州規格
などへの対応も容易となる。This means that it is not necessary to prepare two types of the current limiting resistor 3 for lighting the tail lamp and for lighting the stop lamp, the cost can be reduced by reducing the number of parts, and the current limiting resistor 3 can be used. In addition, the power consumption is reduced, and the size of the vehicle lamp is reduced, and the heat generation of the vehicle lamp as a whole is reduced. In addition, LED lamp 2
Since the disconnection of each column of a can be detected, it becomes easy to comply with European standards.
【0021】また、PWM制御回路部5側においても、
電流制限抵抗3が設けられていることで、デューテイ制
御を行なうときにも、それ程の精度は要求されないもの
となり、回路の簡素化などが可能となり、また、コイル
などインダクタンスを含まないものとすることができる
ので逆起電力によるノイズの発生も少ないものとするこ
とができる。Also on the PWM control circuit 5 side,
Since the current limiting resistor 3 is provided, even if the duty control is performed, such accuracy is not required, the circuit can be simplified, and the coil or the like does not include the inductance. Therefore, the occurrence of noise due to the back electromotive force can be reduced.
【0022】図5は本発明に係る点灯回路1の別の実施
形態を示すものであり、前の実施形態においてはスイッ
チング回路部4はNPNトランジスタQ1により構成さ
れ、前記電流制限抵抗3の更にアース側に接続されるも
のとして説明を行なったが、本発明においてはこれを限
定するものではなく、図示のようにPNPトランジスタ
Q2を用いて電源側に設けても良いものである。FIG. 5 shows another embodiment of the lighting circuit 1 according to the present invention. In the previous embodiment, the switching circuit section 4 is constituted by an NPN transistor Q1 and the current limiting resistor 3 is further grounded. However, the present invention is not limited to this, and the PNP transistor Q2 may be provided on the power supply side as shown in the figure.
【0023】この場合、前記電流制限抵抗3は一端で接
地することが可能となるので、上記でも説明したよう
に、この電流制限抵抗3とLEDランプ2aとの接続点
Pの電位で前記LEDランプ2aの断線の検出を行なう
ときには、出力される電位が安定するものとなり、断線
の判定が容易化する。In this case, since the current limiting resistor 3 can be grounded at one end, as described above, the LED lamp is at the potential of the connection point P between the current limiting resistor 3 and the LED lamp 2a. When the disconnection of 2a is detected, the output potential becomes stable, which facilitates the determination of disconnection.
【0024】[0024]
【発明の効果】以上に説明したように本発明により、点
灯回路は、少なくとも1個のLEDランプから成るラン
プ列と電流制限抵抗とが前記電流制限抵抗を接地側とし
て直列に接続された組立列の1列、もしくは複数列が並
列に接続された光源部と、車載用LED灯具の入力側に
与えられる信号によりデューティ比を可変するPWM制
御回路部と、光源部の電源側もしくは接地側に接続され
前記PWM制御回路部からの出力に基づいて光源部に加
えられる電源のデューティ比を制御するスイッチング回
路部とから構成されている車載用LED灯具の点灯回路
とすることで、従来の電流制限抵抗のみで点灯回路を構
成したときの消費電力の過大化を防止すると共に、それ
に伴い点灯回路全体が大型化したり、過大な発熱を生じ
るのをなくし、更には、LEDランプのマトリクス配線
も不要とし、欧州規格にも対応可能とするものである。
また、DC/DCコンバータで点灯回路を構成したとき
の、DC/DCコンバータを発生源とするノイズの発生
の問題をなくし、もって、この種の点灯回路の性能の向
上とコストダウンとに極めて優れた効果を奏するもので
ある。As described above, according to the present invention, in the lighting circuit, the lamp array including at least one LED lamp and the current limiting resistor are connected in series with the current limiting resistor as the ground side. 1 column or a plurality of columns are connected in parallel, a PWM control circuit unit that varies the duty ratio by a signal given to the input side of the vehicle-mounted LED lamp, and is connected to the power source side or the ground side of the light source unit. The current limiting resistor according to the related art is used as a lighting circuit for an on-vehicle LED lamp, which includes a switching circuit unit that controls a duty ratio of a power source applied to a light source unit based on an output from the PWM control circuit unit. It prevents excessive power consumption when the lighting circuit is configured with only the lighting circuit, and prevents the entire lighting circuit from increasing in size and generating excessive heat. The matrix wiring of the LED lamp is also not necessary, but also possible to cope with European standards.
Further, when the lighting circuit is constructed by the DC / DC converter, the problem of noise generation from the DC / DC converter is eliminated, and therefore the performance of this kind of lighting circuit is improved and the cost is extremely excellent. It has a great effect.
【図1】 本発明に係る車載用LED灯具の点灯回路の
実施形態を示す略示的な回路図である。FIG. 1 is a schematic circuit diagram showing an embodiment of a lighting circuit of an on-vehicle LED lamp according to the present invention.
【図2】 本発明に係る点灯回路のテール点灯時の波形
の例を示す説明図である。FIG. 2 is an explanatory diagram showing an example of a waveform at the time of tail lighting of the lighting circuit according to the present invention.
【図3】 同じく本発明に係る点灯回路のストップ点灯
時の波形の例を示す説明図である。FIG. 3 is an explanatory diagram showing an example of waveforms when the stop circuit of the lighting circuit according to the present invention is also lit.
【図4】 同じく本発明に係る点灯回路のストップ点灯
時であり且つ車両電源が電圧上昇したときの波形の例を
示す説明図である。FIG. 4 is an explanatory diagram showing an example of a waveform when stop lighting of the lighting circuit according to the present invention is performed and the voltage of the vehicle power supply is increased.
【図5】 同じく本発明に係る車載用LED灯具の点灯
回路の別な実施形態を示す略示的な回路図である。FIG. 5 is a schematic circuit diagram showing another embodiment of a lighting circuit of an in-vehicle LED lamp according to the present invention.
【図6】 従来例を示す略示的な回路図である。FIG. 6 is a schematic circuit diagram showing a conventional example.
【図7】 別の従来例を示す略示的な回路図である。FIG. 7 is a schematic circuit diagram showing another conventional example.
1……点灯回路 2……光源部 2a……LEDランプ 2b……ランプ列 2c……組立列 3……電流制限抵抗 4……スイッチング回路部 5……PWM制御回路部 5a……入力電圧検出回路 6……断線検出回路 7……逆接防止ダイオード 8……ツェナーダイオード 1 ... Lighting circuit 2 ... Light source 2a ... LED lamp 2b ... Lamp row 2c ... Assembly line 3 ... Current limiting resistance 4 ... Switching circuit section 5 ... PWM control circuit 5a ... Input voltage detection circuit 6 ... Disconnection detection circuit 7 ... Reverse connection prevention diode 8 ... Zener diode
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) F21Q 1/00 N Z Fターム(参考) 3K073 AA43 AA52 AA83 AA93 AB01 BA02 BA09 CF04 CG02 CG10 CJ17 3K080 AA01 BA07 BE07 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) F21Q 1/00 NZ F term (reference) 3K073 AA43 AA52 AA83 AA93 AB01 BA02 BA09 CF04 CG02 CG10 CJ17 3K080 AA01 BA07 BE07
Claims (3)
載用LED灯具の点灯回路において、前記点灯回路は、
少なくとも1個のLEDランプからなるランプ列と電流
制限抵抗とが前記電流制限抵抗を接地側として直列に接
続された組立列の1列、もしくは、複数列が並列に接続
された光源部と、この車載用LED灯具の入力側に与え
られる信号によりデューティ比を可変するPWM制御回
路部と、前記光源部の電源側もしくは接地側に接続され
前記PWM制御回路部からの出力に基づいて前記光源部
に加えられる電源のデューティ比を制御するスイッチン
グ回路部とから構成されていることを特徴とする車載用
LED灯具の点灯回路。1. A lighting circuit for an on-vehicle LED lighting device, comprising a plurality of LED lamps as a light source, wherein the lighting circuit comprises:
A lamp row composed of at least one LED lamp and a current limiting resistor are connected in series with the current limiting resistor as a ground side in series, or a light source section in which a plurality of rows are connected in parallel, A PWM control circuit unit that changes a duty ratio by a signal given to an input side of an on-vehicle LED lighting device, and a light source unit based on an output from the PWM control circuit unit, which is connected to a power source side or a ground side of the light source unit. A lighting circuit for an on-vehicle LED lighting device, comprising a switching circuit unit for controlling a duty ratio of an applied power source.
LED灯具に印加される車両電源の電圧を検知する入力
電圧検出回路が設けられ、該入力電圧検出回路の出力に
よっても前記デューティ比が可変されることを特徴とす
る請求項1記載の車載用LED灯具の点灯回路。2. The PWM control circuit section is provided with an input voltage detection circuit for detecting a voltage of a vehicle power supply applied to the vehicle-mounted LED lamp, and the duty ratio is also determined by the output of the input voltage detection circuit. The lighting circuit for an on-vehicle LED lighting device according to claim 1, wherein the lighting circuit is variable.
の電流制限抵抗の両端の電位差で当該の組立列中におけ
る前記LEDランプの断線を検出する断線検出部が設け
られ、前記組立列の複数が並列に接続され、何れか1の
組立列に断線が検出されたときには、前記スイッチング
回路部により全ての組立列の点灯を停止させることを特
徴とする請求項1または請求項2記載の車載用LED灯
具の点灯回路。3. The current limiting resistor of the light source section is provided with a disconnection detecting section for detecting a disconnection of the LED lamp in the assembly line by a potential difference between both ends of the current limiting resistance. The plurality of vehicles are connected in parallel, and when a disconnection is detected in any one of the assembly rows, the switching circuit section stops the lighting of all the assembly rows. Lighting circuit for LED lighting fixtures.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002117683A JP2003317978A (en) | 2002-04-19 | 2002-04-19 | Lighting circuit for on-vehicle led lighting fixture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002117683A JP2003317978A (en) | 2002-04-19 | 2002-04-19 | Lighting circuit for on-vehicle led lighting fixture |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003317978A true JP2003317978A (en) | 2003-11-07 |
Family
ID=29534803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002117683A Pending JP2003317978A (en) | 2002-04-19 | 2002-04-19 | Lighting circuit for on-vehicle led lighting fixture |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2003317978A (en) |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005206074A (en) * | 2004-01-23 | 2005-08-04 | Koito Mfg Co Ltd | Lighting unit for vehicle |
JP2005302712A (en) * | 2004-03-19 | 2005-10-27 | Citizen Watch Co Ltd | Led driving circuit and liquid crystal device using it |
JP2006131105A (en) * | 2004-11-05 | 2006-05-25 | Sugiyama Electron:Kk | Lamp unit for vehicle |
WO2007055519A1 (en) * | 2005-11-09 | 2007-05-18 | Yuyang Telecom Co., Ltd | Constant current pulse width modulation driving circuit for light emitting diode |
JP2007145114A (en) * | 2005-11-25 | 2007-06-14 | Stanley Electric Co Ltd | Illumination lamp |
JP2007173697A (en) * | 2005-12-26 | 2007-07-05 | Denso Corp | Light-emitting diode-driving device |
JP2007189103A (en) * | 2006-01-13 | 2007-07-26 | Denso Corp | Light-emitting diode driving device |
JP2007230382A (en) * | 2006-03-01 | 2007-09-13 | Ichikoh Ind Ltd | Vehicular lighting system |
JP2007245760A (en) * | 2006-03-13 | 2007-09-27 | Ichikoh Ind Ltd | Lighting circuit for vehicle lighting fixture |
US7327586B2 (en) | 2004-01-22 | 2008-02-05 | Koito Manufacturing Co., Ltd. | Power supply unit and lighting device for vehicle |
US7414524B2 (en) | 2004-09-02 | 2008-08-19 | Koito Manufacturing Co., Ltd. | Lighting control circuit for vehicle lighting equipment |
JP2008247393A (en) * | 2008-07-14 | 2008-10-16 | Koito Mfg Co Ltd | Lamp fitting for vehicle |
DE112006002875T5 (en) | 2005-12-12 | 2008-11-06 | Mitsubishi Electric Corp. | LED lighting device and vehicle lighting device using the same |
WO2009100143A2 (en) * | 2008-02-04 | 2009-08-13 | National Semiconductor Corporation | Laser diode / led drive circuit |
JP2009241921A (en) * | 2008-03-13 | 2009-10-22 | Koito Mfg Co Ltd | Headlamp for vehicle |
JP2009266723A (en) * | 2008-04-28 | 2009-11-12 | Koito Mfg Co Ltd | Lighting control device |
JP2010015728A (en) * | 2008-07-01 | 2010-01-21 | Aisin Aw Co Ltd | Backlight dimming control device |
JP2010033878A (en) * | 2008-07-29 | 2010-02-12 | Sakae Riken Kogyo Co Ltd | Automotive lamp equipment |
JP2010118170A (en) * | 2008-11-11 | 2010-05-27 | Mitsuba Corp | Lighting control circuit of lamp body, and lamp body for bicycle |
CN1763832B (en) * | 2004-10-21 | 2010-06-23 | 三星电子株式会社 | Multi display device and method of controlling the same |
JP2011082170A (en) * | 2009-10-08 | 2011-04-21 | Intersil Americas Inc | Adaptive pwm controller for multi-phase led driver |
KR101069556B1 (en) | 2010-12-28 | 2011-10-05 | 주식회사 케이지테크 | Illumination power led driving circuit |
JP2012023029A (en) * | 2010-06-18 | 2012-02-02 | Anden | Power supply device for light-emitting diode drive |
US8154214B2 (en) | 2009-01-22 | 2012-04-10 | Panasonic Corporation | Switching power supply for an illumination device with precision current control |
CN103249211A (en) * | 2012-02-09 | 2013-08-14 | 台达电子企业管理(上海)有限公司 | Lighting device, lighting system and lamp |
JP2013203146A (en) * | 2012-03-27 | 2013-10-07 | Ichikoh Ind Ltd | Lighting fixture for vehicle |
WO2014103598A1 (en) * | 2012-12-27 | 2014-07-03 | シャープ株式会社 | Electronic device |
DE102014105094A1 (en) | 2013-04-22 | 2014-10-23 | Varroc Automotive Systems s.r.o. | Pulse circuit control device for the LED lighting of an LED drive module for lights for use in motor vehicles, which is equipped with light sources having LEDs and a drive module for the function and excitation of the LEDs |
-
2002
- 2002-04-19 JP JP2002117683A patent/JP2003317978A/en active Pending
Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7327586B2 (en) | 2004-01-22 | 2008-02-05 | Koito Manufacturing Co., Ltd. | Power supply unit and lighting device for vehicle |
US7105945B2 (en) | 2004-01-23 | 2006-09-12 | Koito Manufacturing Co., Ltd. | Lighting device for vehicle |
JP2005206074A (en) * | 2004-01-23 | 2005-08-04 | Koito Mfg Co Ltd | Lighting unit for vehicle |
JP2005302712A (en) * | 2004-03-19 | 2005-10-27 | Citizen Watch Co Ltd | Led driving circuit and liquid crystal device using it |
US7414524B2 (en) | 2004-09-02 | 2008-08-19 | Koito Manufacturing Co., Ltd. | Lighting control circuit for vehicle lighting equipment |
CN1763832B (en) * | 2004-10-21 | 2010-06-23 | 三星电子株式会社 | Multi display device and method of controlling the same |
JP2006131105A (en) * | 2004-11-05 | 2006-05-25 | Sugiyama Electron:Kk | Lamp unit for vehicle |
JP4557216B2 (en) * | 2004-11-05 | 2010-10-06 | 株式会社 天山製作所 | Lamp unit for vehicle |
WO2007055519A1 (en) * | 2005-11-09 | 2007-05-18 | Yuyang Telecom Co., Ltd | Constant current pulse width modulation driving circuit for light emitting diode |
KR100727354B1 (en) | 2005-11-09 | 2007-06-13 | 주식회사 유양정보통신 | Constant Current Pulse Width Modulation Driving Circuit for Light Emitting Diode |
JP2007145114A (en) * | 2005-11-25 | 2007-06-14 | Stanley Electric Co Ltd | Illumination lamp |
JP4627252B2 (en) * | 2005-11-25 | 2011-02-09 | スタンレー電気株式会社 | Lighting fixture |
DE112006002875T5 (en) | 2005-12-12 | 2008-11-06 | Mitsubishi Electric Corp. | LED lighting device and vehicle lighting device using the same |
US8053923B2 (en) | 2005-12-12 | 2011-11-08 | Mitsubishi Electric Corporation | Light-emitting diode lighting apparatus and vehicle light lighting apparatus using the same |
DE112006002875B4 (en) * | 2005-12-12 | 2015-01-15 | Mitsubishi Electric Corp. | LED lighting device and vehicle lighting device using the same |
JP2007173697A (en) * | 2005-12-26 | 2007-07-05 | Denso Corp | Light-emitting diode-driving device |
JP2007189103A (en) * | 2006-01-13 | 2007-07-26 | Denso Corp | Light-emitting diode driving device |
JP2007230382A (en) * | 2006-03-01 | 2007-09-13 | Ichikoh Ind Ltd | Vehicular lighting system |
JP2007245760A (en) * | 2006-03-13 | 2007-09-27 | Ichikoh Ind Ltd | Lighting circuit for vehicle lighting fixture |
WO2009100143A2 (en) * | 2008-02-04 | 2009-08-13 | National Semiconductor Corporation | Laser diode / led drive circuit |
WO2009100143A3 (en) * | 2008-02-04 | 2009-10-01 | National Semiconductor Corporation | Laser diode / led drive circuit |
US8665188B2 (en) | 2008-02-04 | 2014-03-04 | National Semiconductor Corporation | Laser diode / LED drive circuit |
JP2009241921A (en) * | 2008-03-13 | 2009-10-22 | Koito Mfg Co Ltd | Headlamp for vehicle |
JP2009266723A (en) * | 2008-04-28 | 2009-11-12 | Koito Mfg Co Ltd | Lighting control device |
JP2010015728A (en) * | 2008-07-01 | 2010-01-21 | Aisin Aw Co Ltd | Backlight dimming control device |
JP2008247393A (en) * | 2008-07-14 | 2008-10-16 | Koito Mfg Co Ltd | Lamp fitting for vehicle |
JP4722971B2 (en) * | 2008-07-14 | 2011-07-13 | 株式会社小糸製作所 | Vehicle lighting |
JP2010033878A (en) * | 2008-07-29 | 2010-02-12 | Sakae Riken Kogyo Co Ltd | Automotive lamp equipment |
JP2010118170A (en) * | 2008-11-11 | 2010-05-27 | Mitsuba Corp | Lighting control circuit of lamp body, and lamp body for bicycle |
US8154214B2 (en) | 2009-01-22 | 2012-04-10 | Panasonic Corporation | Switching power supply for an illumination device with precision current control |
JP2011082170A (en) * | 2009-10-08 | 2011-04-21 | Intersil Americas Inc | Adaptive pwm controller for multi-phase led driver |
JP2012023029A (en) * | 2010-06-18 | 2012-02-02 | Anden | Power supply device for light-emitting diode drive |
KR101069556B1 (en) | 2010-12-28 | 2011-10-05 | 주식회사 케이지테크 | Illumination power led driving circuit |
CN103249211A (en) * | 2012-02-09 | 2013-08-14 | 台达电子企业管理(上海)有限公司 | Lighting device, lighting system and lamp |
JP2013203146A (en) * | 2012-03-27 | 2013-10-07 | Ichikoh Ind Ltd | Lighting fixture for vehicle |
WO2014103598A1 (en) * | 2012-12-27 | 2014-07-03 | シャープ株式会社 | Electronic device |
CN104823526A (en) * | 2012-12-27 | 2015-08-05 | 夏普株式会社 | Electronic device |
JP5961284B2 (en) * | 2012-12-27 | 2016-08-02 | シャープ株式会社 | Electronics |
US9970994B2 (en) | 2012-12-27 | 2018-05-15 | Sharp Kabushiki Kaisha | Electronic device |
DE102014105094A1 (en) | 2013-04-22 | 2014-10-23 | Varroc Automotive Systems s.r.o. | Pulse circuit control device for the LED lighting of an LED drive module for lights for use in motor vehicles, which is equipped with light sources having LEDs and a drive module for the function and excitation of the LEDs |
CZ305489B6 (en) * | 2013-04-22 | 2015-10-29 | Varroc Lighting Systems, s.r.o. | Pulse-switched controller for LED lighting of LED power supply module of lighting fixtures in automobile applications provided light sources with LED and power supply module of LED function and excitation |
US9338842B2 (en) | 2013-04-22 | 2016-05-10 | Varroc Lighting Systems, s.r.o. | Pulse switched resistor driver |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2003317978A (en) | Lighting circuit for on-vehicle led lighting fixture | |
US8076953B2 (en) | LED outage detection circuit | |
JP4007096B2 (en) | Lighting device | |
US9265113B2 (en) | Single wire serial interface | |
CN107113948B (en) | Light source lighting circuit and turn signal lamp | |
US6867557B2 (en) | Lighting circuit | |
US20090140716A1 (en) | Circuit arrangement for generating a pulse width modulated signal for driving electrical loads | |
EP1113708A2 (en) | Led driver circuit and method | |
US8946927B2 (en) | Control device for lighting LED and detecting breakage thereof | |
US7414524B2 (en) | Lighting control circuit for vehicle lighting equipment | |
JP4087211B2 (en) | Vehicle lighting | |
US20110043140A1 (en) | Charge pump circuit with current detecting and method thereof | |
US7301284B2 (en) | Lighting control circuit for vehicle lighting equipment | |
US6570369B2 (en) | Regulator with integratable pulse drive signal | |
JP2004322982A (en) | Vehicular lamp | |
JP2002218744A (en) | Feeder module with internal energy storage circuit | |
US6420832B2 (en) | Switching circuit with overload protection | |
US20090267520A1 (en) | Lighting control device | |
JP2011073509A (en) | On-vehicle lamp lighting control circuit | |
JP2002270384A (en) | Protecting circuit of current driving element for lighting fixture | |
JP2003011748A (en) | Power unit for electrical component provided on automobile | |
JP5103811B2 (en) | Backlight dimming control device | |
CN117183953A (en) | Tail lamp control system, control method and automobile with tail lamp control system | |
JP4075223B2 (en) | Sensor circuit | |
JP2000268985A (en) | Lighting circuit of discharge lamp |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050210 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071029 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20071106 |
|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20080304 |