JPH09251895A - Lighting circuit for vehicular discharge lamp - Google Patents

Lighting circuit for vehicular discharge lamp

Info

Publication number
JPH09251895A
JPH09251895A JP8057585A JP5758596A JPH09251895A JP H09251895 A JPH09251895 A JP H09251895A JP 8057585 A JP8057585 A JP 8057585A JP 5758596 A JP5758596 A JP 5758596A JP H09251895 A JPH09251895 A JP H09251895A
Authority
JP
Japan
Prior art keywords
inductance
input power
discharge lamp
power source
noise
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.)
Granted
Application number
JP8057585A
Other languages
Japanese (ja)
Other versions
JP3300875B2 (en
Inventor
Akiyoshi Ozaki
明好 尾崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Priority to JP05758596A priority Critical patent/JP3300875B2/en
Priority to DE19710691A priority patent/DE19710691A1/en
Publication of JPH09251895A publication Critical patent/JPH09251895A/en
Application granted granted Critical
Publication of JP3300875B2 publication Critical patent/JP3300875B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0088—Details of electrical connections
    • B60Q1/0094—Arrangement of electronic circuits separated from the light source, e.g. mounting of housings for starter circuits for discharge lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/17—Discharge light sources
    • F21S41/172—High-intensity discharge light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F21S41/192—Details of lamp holders, terminals or connectors

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

PROBLEM TO BE SOLVED: To facilitate work for assembling a head light by electrically connecting a noise shield to a line for connecting one end of an inductance onto a negative electrode side of an input power source, and electrically connecting the noise shield to a line for connecting two capacitors onto the negative electrode side of the input power source. SOLUTION: A noise shield 5 is electrically connected to a line for connecting one end of an inductance L2 onto a negative electrode side of an input power source. A point P1 for connecting one end of the inductance L2 onto the negative electrode side of the input power source is connected to the noise shield 5 via a lead wire LN3, thereby absorbing bulb noise produced during lighting a discharge lamp 4. In this case, the bulb noise via the noise shield 5 cannot be transmitted to a main circuit 3 but released toward the input power source. A filter circuit 2' comprises the inductance L1 and capacitors C1, C2, and the noise shield 5 is electrically connected to the connecting line between the capacitors C1, C2 and the negative electrode side of the input power source, thus absorbing the noise during lighting of the discharge lamp 4.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】この発明は、直流電圧を所要
の直流電圧に変換し、この直流電圧を矩形波状の交流電
圧に変換し、この交流電圧に始動用パルスを重畳させて
放電灯を点灯させる車輌用放電灯の点灯回路に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention converts a DC voltage into a required DC voltage, converts this DC voltage into a rectangular wave AC voltage, and superimposes a starting pulse on this AC voltage to light a discharge lamp. The present invention relates to a lighting circuit for a vehicle discharge lamp.

【０００２】[0002]

【従来の技術】従来より、この種の車輌用放電灯の点灯
回路は、フィルタ回路とメイン回路とを備え、メイン回
路においてフィルタ回路を介して供給される直流電圧を
所要の直流電圧に変換し、この直流電圧を矩形波状の交
流電圧に変換し、この交流電圧に始動用パルスを重畳さ
せて放電灯を点灯させるようにしている。図３はこの車
輌用放電灯の点灯回路の要部を示し、同図において、１
は電源スイッチ、２はフィルタ回路、３はメイン回路、
４は放電灯（バルブ）である。2. Description of the Related Art Conventionally, a lighting circuit for a vehicle discharge lamp of this type has a filter circuit and a main circuit, and converts a DC voltage supplied through the filter circuit in the main circuit into a required DC voltage. The DC voltage is converted into a rectangular wave AC voltage, and a starting pulse is superimposed on the AC voltage to light the discharge lamp. FIG. 3 shows the main part of the lighting circuit of this vehicle discharge lamp. In FIG.
Is a power switch, 2 is a filter circuit, 3 is a main circuit,
Reference numeral 4 is a discharge lamp (bulb).

【０００３】フィルタ回路２は、その一端が入力電源の
正極性側にその他端がメイン回路３側に接続されたイン
ダクタンスＬ１と、その一端が入力電源の負極性側にそ
の他端がメイン回路３側に接続されたインダクタンスＬ
２と、インダクタンスＬ１の一端とインダクタンスＬ２
の一端との間に接続されたコンデンサＣ１と、インダク
タンスＬ１の他端とインダクタンスＬ２の他端との間に
接続されたコンデンサＣ２とから構成されている。この
フィルタ回路２によって、入力電源側からメイン回路３
側へのノイズ（ノーマルモードノイズ）の進入、および
メイン回路３側から入力電源側へのノイズ（コモンモー
ドノイズ）の流出が防止される。The filter circuit 2 has an inductance L1 whose one end is connected to the positive side of the input power supply and the other end is connected to the main circuit 3 side, and one end thereof is connected to the negative side of the input power supply and the other end is the main circuit 3 side. Inductance L connected to
2, one end of the inductance L1 and the inductance L2
, And a capacitor C2 connected between the other end of the inductance L1 and the other end of the inductance L2. This filter circuit 2 allows the main circuit 3 to be connected from the input power source side.
It is possible to prevent noise (normal mode noise) from entering the side and noise (common mode noise) from the main circuit 3 side to the input power source side.

【０００４】メイン回路３は、ＤＣ−ＤＣコンバータ３
−１と、ブリッジ回路３−２と、スタータ回路３−３と
を備えている。ＤＣ−ＤＣコンバータ３−１は、フィル
タ回路２を介して供給される直流電圧を所要の電圧に変
換し、この直流電圧をブリッジ回路３−２へ供給する。
ブリッジ回路３−２は、ＤＣ−ＤＣコンバータ３−１か
らの直流電圧を矩形波状の交流電圧に変換し、スタータ
回路３−３へ供給する。スタータ回路３−３はブリッジ
回路３−２からの交流電圧に始動用パルスを重畳させて
放電灯４を点灯させる。The main circuit 3 is a DC-DC converter 3
-1, a bridge circuit 3-2, and a starter circuit 3-3. The DC-DC converter 3-1 converts the DC voltage supplied via the filter circuit 2 into a required voltage, and supplies this DC voltage to the bridge circuit 3-2.
The bridge circuit 3-2 converts the DC voltage from the DC-DC converter 3-1 into a rectangular wave AC voltage and supplies the rectangular wave AC voltage to the starter circuit 3-3. The starter circuit 3-3 superimposes a starting pulse on the AC voltage from the bridge circuit 3-2 to light the discharge lamp 4.

【０００５】この車輌用放電灯の点灯回路では、放電灯
４の点灯中に発生するバルブノイズを除去するために、
金属性のノイズシールド５を設けている。すなわち、フ
ィルタ回路２，メイン回路３および放電灯４への出力線
ＬＮ１，ＬＮ２を覆うようにノイズシールド５を設け、
このノイズシールド５をボディアースすることにより、
放電灯４の点灯中に発生するバルブノイズを吸収するよ
うにしている。In this lighting circuit for a vehicle discharge lamp, in order to remove bulb noise generated during lighting of the discharge lamp 4,
A metallic noise shield 5 is provided. That is, the noise shield 5 is provided so as to cover the output lines LN1 and LN2 to the filter circuit 2, the main circuit 3 and the discharge lamp 4,
By grounding this noise shield 5,
The bulb noise generated during lighting of the discharge lamp 4 is absorbed.

【０００６】[0006]

【発明が解決しようとする課題】しかしながら、フィル
タ回路２やメイン回路３は放電灯４と共にヘッドライト
に一体的に設けられ、ノイズシールド５をボディアース
するには、ノイズシールド５とボディとを接続するリー
ド線ＬＮ３をヘッドライトから引き回さなければなら
ず、ヘッドライト組み付け時の作業が面倒となるばかり
でなく、コストアップの要因ともなる。However, the filter circuit 2 and the main circuit 3 are integrally provided in the headlight together with the discharge lamp 4, and the noise shield 5 and the body are connected to each other for body grounding the noise shield 5. The lead wire LN3 must be routed around the headlight, which not only complicates the work of assembling the headlight, but also increases the cost.

【０００７】本発明はこのような課題を解決するために
なされたもので、その目的とするところは、ヘッドライ
ト組み付け時の作業を簡単とすることができ、またコス
トダウンを促進することのできる車輌用放電灯の点灯回
路を提供することにある。The present invention has been made to solve the above problems, and an object of the present invention is to simplify the work for assembling the headlight and to promote cost reduction. It is to provide a lighting circuit for a vehicle discharge lamp.

【０００８】[0008]

【課題を解決するための手段】このような目的を達成す
るために、第１発明（請求項１に係る発明）は、上述し
た車輌用放電灯の点灯回路において、フィルタ回路を、
その一端が入力電源の正極性側にその他端がメイン回路
側に接続された第１のインダクタンスと、その一端が入
力電源の負極性側にその他端がメイン回路側に接続され
た第２のインダクタンスと、第１のインダクタンスの一
端と第２のインダクタンスの一端との間に接続された第
１のコンデンサと、第２のインダクタンスの他端と第２
のインダクタンスの他端との間に接続された第２のコン
デンサとで構成し、第２のインダクタンスの一端と入力
電源の負極性側との接続ラインにノイズシールドを電気
的に接続するようにしたものである。この発明によれ
ば、ノイズシールドにのってきたバルブノイズが、第２
のインダクタンスの一端と入力電源の負極性側との接続
ラインを通って入力電源側へ出る。In order to achieve such an object, a first invention (an invention according to claim 1) is to provide a filter circuit in a lighting circuit of a vehicle discharge lamp as described above,
A first inductance having one end connected to the positive polarity side of the input power supply and the other end connected to the main circuit side, and a second inductance having one end connected to the negative polarity side of the input power supply and the other end connected to the main circuit side A first capacitor connected between one end of the first inductance and one end of the second inductance, and the other end of the second inductance and the second capacitor.
And a second capacitor connected between the other end of the inductance and the other end of the second inductance, and the noise shield is electrically connected to the connection line between the one end of the second inductance and the negative side of the input power source. It is a thing. According to the present invention, the valve noise that has come to the noise shield is
Goes out to the input power supply side through a connection line between one end of the inductance of the and the negative side of the input power supply.

【０００９】第２発明（請求項２に係る発明）は、上述
した車輌用放電灯の点灯回路において、フィルタ回路
を、その一端が入力電源の正極性側にその他端がメイン
回路側に接続されたインダクタンスと、このインダクタ
ンスの一端と入力電源の負極性側との間に接続された第
１のコンデンサと、前記インダクタンスの他端と入力電
源の負極性側との間に接続された第２のコンデンサとで
構成し、第１のコンデンサおよび第２のコンデンサと入
力電源の負極性側との接続ラインにノイズシールドを電
気的に接続したものである。この発明によれば、ノイズ
シールドにのってきたバルブノイズが、第１のコンデン
サおよび第２のコンデンサと入力電源の負極性側との接
続ラインを通って入力電源側へ出る。A second invention (the invention according to claim 2) is the above-mentioned lighting circuit for a vehicle discharge lamp, wherein a filter circuit is connected to the positive side of the input power source and the other side to the main circuit side. An inductance, a first capacitor connected between one end of the inductance and the negative side of the input power supply, and a second capacitor connected between the other end of the inductance and the negative side of the input power supply. And a noise shield electrically connected to a connection line between the first capacitor and the second capacitor and the negative side of the input power source. According to the present invention, the valve noise that has come to the noise shield passes through the connection line between the first capacitor and the second capacitor and the negative side of the input power supply, and goes out to the input power supply side.

【００１０】[0010]

【発明の実施の形態】以下、本発明を実施の形態に基づ
き詳細に説明する。 〔実施の形態１：第１発明〕図１（ａ）は本発明に係る
車輌用放電灯の点灯回路の要部を示す図である。同図に
おいて、図３と同一符号は同一或いは同等構成要素を示
し、その説明は省略する。この実施の形態においては、
ノイズシールド５をボディアースするのではなく、イン
ダクタンスＬ２の一端と入力電源の負極性側との接続ラ
インに電気的に接続している。すなわち、インダクタン
スＬ２の一端と入力電源の負極性側との接続点Ｐ１とノ
イズシールド５との間をリード線ＬＮ３で接続すること
により、放電灯４の点灯中に発生するバルブノイズを吸
収するようにしている。この場合、インダクタンスＬ２
があるためメイン回路３側の高周波インピーダンスが高
く、ノイズシールド５にのってきたバルブノイズはメイ
ン回路３側へは進入せず、そのまま入力電源側へ出る。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments. [First Embodiment: First Invention] FIG. 1A is a diagram showing a main part of a lighting circuit of a vehicle discharge lamp according to the present invention. 3, the same reference numerals as those in FIG. 3 denote the same or equivalent components, and a description thereof will be omitted. In this embodiment,
The noise shield 5 is not body-grounded, but is electrically connected to a connection line between one end of the inductance L2 and the negative side of the input power supply. That is, by connecting the connection point P1 between one end of the inductance L2 and the negative side of the input power source and the noise shield 5 with the lead wire LN3, the bulb noise generated during the lighting of the discharge lamp 4 is absorbed. I have to. In this case, the inductance L2
Because of this, the high-frequency impedance on the main circuit 3 side is high, and the valve noise that has reached the noise shield 5 does not enter the main circuit 3 side but directly exits to the input power source side.

【００１１】なお、図１（ａ）において、インダクタン
スＬ２の他端とメイン回路３側との接続点Ｐ２とノイズ
シールド５との間をリード線ＬＮ３で接続することが考
えられる。しかし、この場合、入力電源側への高周波イ
ンピーダンスが高くなり、メイン回路３側へバルブノイ
ズが進入し、内部で大きな共振となり、全体のノイズ性
能を大きくダウンさせてしまう。これに対して、この実
施の形態では、メイン回路３側へバルブノイズが進入し
ないので、内部で大きな共振となることがなく、全体の
ノイズ性能が大きくダウンすることがない。In FIG. 1A, it is conceivable to connect the connection point P2 between the other end of the inductance L2 and the main circuit 3 side and the noise shield 5 with a lead wire LN3. However, in this case, the high frequency impedance to the input power source side becomes high, the valve noise enters the main circuit 3 side, the resonance becomes large internally, and the overall noise performance is greatly reduced. On the other hand, in this embodiment, since the valve noise does not enter the main circuit 3 side, there is no large resonance inside, and the overall noise performance does not drop significantly.

【００１２】図２にこの点灯回路を組み込んだヘッドラ
イトの要部断面図を示す。同図において、１００はヘッ
ドライト（メタルハライドランプ）、１０１はレンズ、
１０２はリフレクタ、１０３はソケット、１０４はフィ
ルタ回路２およびメイン回路３を収容した金属性のシー
ルドケース、１０５はメイン回路３からの放電灯４への
出力線ＬＮ１およびＬＮ２を覆う金属性のシールド網、
１０６はソケット１０３を覆う金属性のシールドケース
であり、シールドケース１０４，シールド網１０５およ
びシールドケース１０６によってノイズシールド５が形
成されている。なお、図２にはリード線ＬＮ３は示して
いないが、シールドケース１０４内において接続点Ｐ１
に接続されている。FIG. 2 is a sectional view of the main part of a headlight incorporating this lighting circuit. In the figure, 100 is a headlight (metal halide lamp), 101 is a lens,
102 is a reflector, 103 is a socket, 104 is a metallic shield case that houses the filter circuit 2 and the main circuit 3, and 105 is a metallic shield network that covers the output lines LN1 and LN2 from the main circuit 3 to the discharge lamp 4. ,
A metallic shield case 106 covers the socket 103, and the noise shield 5 is formed by the shield case 104, the shield net 105, and the shield case 106. Although the lead wire LN3 is not shown in FIG. 2, the connection point P1 is provided in the shield case 104.
It is connected to the.

【００１３】以上説明したように、この実施の形態によ
れば、ノイズシールド５とボディとを接続するリード線
をヘッドライト１００から引き回さなくてもよく、ヘッ
ドライト組み付け時の作業が簡単となる。また、ノイズ
シールド５と接続点Ｐ１との間を接続するリード線ＬＮ
３は短くて済み、コストダウンを促進することができ
る。As described above, according to this embodiment, the lead wire connecting the noise shield 5 and the body does not have to be routed from the headlight 100, and the work for assembling the headlight is simple. Become. In addition, the lead wire LN connecting between the noise shield 5 and the connection point P1
3 can be short and can promote cost reduction.

【００１４】〔実施の形態２：第２発明〕図１（ｂ）は
本発明に係る車輌用放電灯の点灯回路の要部を示す図で
ある。同図において、図３と同一符号は同一或いは同等
構成要素を示し、その説明は省略する。この実施の形態
においては、フィルタ回路２’をインダクタンスＬ１と
コンデンサＣ１およびＣ２とにより構成し、ノイズシー
ルド５をコンデンサＣ１およびＣ２と入力電源の負極性
側との接続ラインに電気的に接続している。すなわち、
フィルタ回路２’をインダクタンスＬ２を除去した構成
とし、コンデンサＣ１およびＣ２と入力電源の負極性側
との接続点Ｐ１とノイズシールド５との間をリード線Ｌ
Ｎ３で接続することにより、放電灯４の点灯中に発生す
るバルブノイズを吸収するようにしている。[Second Embodiment: Second Invention] FIG. 1B is a diagram showing a main part of a lighting circuit of a vehicle discharge lamp according to the present invention. 3, the same reference numerals as those in FIG. 3 denote the same or equivalent components, and a description thereof will be omitted. In this embodiment, the filter circuit 2'is constituted by the inductance L1 and the capacitors C1 and C2, and the noise shield 5 is electrically connected to the connection line between the capacitors C1 and C2 and the negative side of the input power source. There is. That is,
The filter circuit 2 ′ has a configuration in which the inductance L2 is removed, and the lead wire L is provided between the connection point P1 between the capacitors C1 and C2 and the negative side of the input power source and the noise shield 5.
By connecting with N3, bulb noise generated during lighting of the discharge lamp 4 is absorbed.

【００１５】この実施の形態では、リード線ＬＮ３の接
続先を接続点Ｐ１としたが、コンデンサＣ１およびＣ２
と入力電源の負極性側との接続ライン上であればどの点
としてもよい。すなわち、インダクタンスＬ２がないの
で、Ｐ２点やＰ３点とノイズシールド５との間をリード
線ＬＮ３で接続したとしても、ノイズシールド５にのっ
てきたバルブノイズが入力電源側に流出し、全体のノイ
ズ性能が大きくダウンすることがない。発明者の実験で
は、インダクタンスＬ２が入っていてもいなくても、ノ
イズ性能に差は出ていない。In this embodiment, the connection destination of the lead wire LN3 is the connection point P1, but the capacitors C1 and C2 are used.
It may be at any point on the connection line between the negative side of the input power source and the. That is, since there is no inductance L2, even if the points P2 and P3 and the noise shield 5 are connected by the lead wire LN3, the valve noise that has reached the noise shield 5 flows out to the input power source side, and The noise performance does not go down significantly. In the experiment by the inventor, there is no difference in noise performance whether or not the inductance L2 is included.

【００１６】なお、インダクタンスＬ２を除去した理由
としては、他にも理由がある。すなわち、メイン回路３
の負極性側に全体の電流を監視する抵抗を入れ、その抵
抗に発生する電圧によって出力をコントロールするよう
にした場合、インダクタンスＬ２があると、電源スイッ
チ１の入切によってメイン回路のＧＮＤ電圧が大きくバ
ウンスするため、出力コントロールが大変難しくなる。
これに対し、インダクタンスＬ２を除去することによっ
て、出力コントロールが簡単となる。There are other reasons for removing the inductance L2. That is, the main circuit 3
If a resistor for monitoring the entire current is inserted on the negative polarity side of and the output is controlled by the voltage generated at that resistor, if there is an inductance L2, the GND voltage of the main circuit will change due to the on / off of the power switch 1. It makes a big bounce, which makes output control very difficult.
On the other hand, removing the inductance L2 simplifies output control.

【００１７】以上説明したように、この実施の形態によ
れば、ノイズシールド５とボディとを接続するリード線
をヘッドライトから引き回さなくてもよく、ヘッドライ
ト組み付け時の作業が簡単となる。また、ノイズシール
ド５と接続点Ｐ１（Ｐ２，Ｐ３）との間を接続するリー
ド線ＬＮ３は短くて済み、コストダウンを促進すること
ができる。さらに、この実施の形態によれば、インダク
タンスＬ２を省略することにより、小型化・低コスト化
を促進することができる。また、リード線ＬＮ３の接続
先はコンデンサＣ１およびＣ２と入力電源の負極性側と
の接続ライン上であればどの点としてもよく、接続先の
自由度が広がる。尚、リード線ＬＮ３は電線による接続
だけでなく、いったん基板上に落とした後、基板取り付
け用ネジを利用してノイズシールドへ接続するなど、そ
の方法は問わない。As described above, according to this embodiment, the lead wire connecting the noise shield 5 and the body does not have to be routed around the headlight, and the work for assembling the headlight is simplified. . Further, the lead wire LN3 connecting between the noise shield 5 and the connection point P1 (P2, P3) can be short, and the cost can be reduced. Furthermore, according to the present embodiment, by omitting the inductance L2, downsizing and cost reduction can be promoted. The lead wire LN3 may be connected to any point on the connection line between the capacitors C1 and C2 and the negative side of the input power supply, and the degree of freedom of the connection destination is expanded. Incidentally, the lead wire LN3 is not limited to the connection by an electric wire, and any method may be used, such as dropping the lead wire LN3 on the board once and then connecting it to the noise shield using a board mounting screw.

【００１８】[0018]

【発明の効果】以上説明したことから明らかなように本
発明によれば、第１発明では、第２のインダクタンスの
一端と入力電源の負極性側との接続ラインにノイズシー
ルドを電気的に接続するようにしたので、ノイズシール
ドにのってきたバルブノイズが第２のインダクタンスの
一端と入力電源の負極性側との接続ラインを通って入力
電源側へ出るものとなり、ノイズシールドとボディとを
接続するリード線をヘッドライトから引き回さなくても
よく、ヘッドライト組み付け時の作業が簡単となる。ま
た、ノイズシールドと上記接続ラインとの間を接続する
リード線は短くて済み、コストダウンを促進することが
できる。As is apparent from the above description, according to the present invention, in the first invention, the noise shield is electrically connected to the connection line between the one end of the second inductance and the negative side of the input power source. As a result, the valve noise coming to the noise shield will come out to the input power supply side through the connection line between the one end of the second inductance and the negative polarity side of the input power supply, and the noise shield and the body will be separated. The lead wire to be connected does not have to be routed around the headlight, which simplifies the work for assembling the headlight. Moreover, the lead wire connecting between the noise shield and the above-mentioned connection line can be short, which can promote cost reduction.

【００１９】また、第２発明では、第１のコンデンサお
よび第２のコンデンサと入力電源の負極性側との接続ラ
インにノイズシールドを電気的に接続するようにしたの
で、ノイズシールドにのってきたバルブノイズが第１の
コンデンサおよび第２のコンデンサと入力電源の負極性
側との接続ラインを通って入力電源側へ出るものとな
り、ノイズシールドとボディとを接続するリード線をヘ
ッドライトから引き回さなくてもよく、ヘッドライト組
み付け時の作業が簡単となる。また、ノイズシールドと
上記接続ラインとの間を接続するリード線は短くて済
み、コストダウンを促進することができる。さらに、こ
の発明によれば、大型部品である第２のインダクタンス
を省略することにより、小型化・低コスト化を促進する
ことができる。また、リード線の接続先は上記接続ライ
ン上であればどの点としてもよく、接続先の自由度が広
がる。In the second invention, the noise shield is electrically connected to the connection line between the first capacitor and the second capacitor and the negative side of the input power source. Valve noise will be emitted to the input power supply side through the connection line between the first and second capacitors and the negative side of the input power supply, and the lead wire connecting the noise shield and the body will be pulled from the headlight. It is not necessary to turn it, and the work when assembling the headlight becomes easy. Moreover, the lead wire connecting between the noise shield and the above-mentioned connection line can be short, which can promote cost reduction. Furthermore, according to the present invention, by omitting the second inductance, which is a large component, it is possible to promote size reduction and cost reduction. Further, the connection destination of the lead wire may be any point on the connection line, and the flexibility of the connection destination is expanded.

【図面の簡単な説明】[Brief description of drawings]

【図１】 本発明に係る車輌用放電灯の点灯回路の要部
を示す図である。FIG. 1 is a diagram showing a main part of a lighting circuit of a vehicle discharge lamp according to the present invention.

【図２】 この点灯回路を組み込んだヘッドライトの要
部断面図である。FIG. 2 is a sectional view of a main part of a headlight incorporating this lighting circuit.

【図３】 従来の車輌用放電灯の点灯回路の要部を示す
図である。FIG. 3 is a diagram showing a main part of a conventional lighting circuit of a vehicle discharge lamp.

【符号の説明】[Explanation of symbols]

１…電源スイッチ、２…フィルタ回路、３…メイン回
路、４…放電灯、５…ノイズシールド、Ｌ１，Ｌ２…イ
ンダクタンス、Ｃ１，Ｃ２…コンデンサ、ＬＮ３…リー
ド線。1 ... Power switch, 2 ... Filter circuit, 3 ... Main circuit, 4 ... Discharge lamp, 5 ... Noise shield, L1, L2 ... Inductance, C1, C2 ... Capacitor, LN3 ... Lead wire.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 フィルタ回路とメイン回路とを備え、前
記メイン回路において前記フィルタ回路を介して供給さ
れる直流電圧を所要の直流電圧に変換し、この直流電圧
を矩形波状の交流電圧に変換し、この交流電圧に始動用
パルスを重畳させて放電灯を点灯させる車輌用放電灯の
点灯回路において、 前記フィルタ回路は、その一端が入力電源の正極性側に
その他端が前記メイン回路側に接続された第１のインダ
クタンスと、その一端が前記入力電源の負極性側にその
他端が前記メイン回路側に接続された第２のインダクタ
ンスと、前記第１のインダクタンスの一端と前記第２の
インダクタンスの一端との間に接続された第１のコンデ
ンサと、前記第２のインダクタンスの他端と前記第２の
インダクタンスの他端との間に接続された第２のコンデ
ンサとを有し、 前記第２のインダクタンスの一端と前記入力電源の負極
性側との接続ラインに、前記放電灯の点灯中に発生する
バルブノイズを除去するための金属性のノイズシールド
が電気的に接続されていることを特徴とする車輌用放電
灯の点灯回路。1. A filter circuit and a main circuit are provided, wherein a DC voltage supplied through the filter circuit in the main circuit is converted into a required DC voltage, and the DC voltage is converted into a rectangular wave AC voltage. , In a lighting circuit of a vehicle discharge lamp for lighting a discharge lamp by superimposing a starting pulse on this AC voltage, one end of the filter circuit is connected to a positive polarity side of an input power source and the other end is connected to the main circuit side. Of the first inductance and a second inductance whose one end is connected to the negative side of the input power source and the other end is connected to the main circuit side, and one end of the first inductance and the second inductance. A first capacitor connected between the one end and a second capacitor connected between the other end of the second inductance and the other end of the second inductance; And a metallic noise shield for removing bulb noise generated during lighting of the discharge lamp is electrically connected to a connection line between one end of the second inductance and the negative side of the input power source. Lighting circuit for a vehicle discharge lamp, which is characterized in that they are connected together. 【請求項２】 フィルタ回路とメイン回路とを備え、前
記メイン回路において前記フィルタ回路を介して供給さ
れる直流電圧を所要の直流電圧に変換し、この直流電圧
を矩形波状の交流電圧に変換し、この交流電圧に始動用
パルスを重畳させて放電灯を点灯させる車輌用放電灯の
点灯回路において、 前記フィルタ回路は、その一端が入力電源の正極性側に
その他端が前記メイン回路側に接続されたインダクタン
スと、このインダクタンスの一端と前記入力電源の負極
性側との間に接続された第１のコンデンサと、前記イン
ダクタンスの他端と前記入力電源の負極性側との間に接
続された第２のコンデンサとを有し、 前記第１のコンデンサおよび前記第２のコンデンサと前
記入力電源の負極性側との接続ラインに、前記放電灯の
点灯中に発生するバルブノイズを除去するための金属性
のノイズシールドが電気的に接続されていることを特徴
とする車輌用放電灯の点灯回路。2. A filter circuit and a main circuit are provided, wherein a DC voltage supplied through the filter circuit in the main circuit is converted into a required DC voltage, and the DC voltage is converted into a rectangular wave AC voltage. , In a lighting circuit of a vehicle discharge lamp for lighting a discharge lamp by superimposing a starting pulse on this AC voltage, one end of the filter circuit is connected to a positive polarity side of an input power source and the other end is connected to the main circuit side. And a first capacitor connected between one end of the inductance and the negative polarity side of the input power source, and a first capacitor connected between the other end of the inductance and the negative polarity side of the input power source. A second capacitor, which is generated during lighting of the discharge lamp in a connection line between the first capacitor and the second capacitor and the negative side of the input power source. Lighting circuit of a vehicular discharge lamp metallic noise shielding for removing the valve noise is characterized by being electrically connected.
JP05758596A 1996-03-14 1996-03-14 Lighting circuit for vehicle discharge lamps Expired - Fee Related JP3300875B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP05758596A JP3300875B2 (en) 1996-03-14 1996-03-14 Lighting circuit for vehicle discharge lamps
DE19710691A DE19710691A1 (en) 1996-03-14 1997-03-14 Lighting circuit for vehicle discharge lamp with filter circuit and main circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP05758596A JP3300875B2 (en) 1996-03-14 1996-03-14 Lighting circuit for vehicle discharge lamps

Publications (2)

Publication Number Publication Date
JPH09251895A true JPH09251895A (en) 1997-09-22
JP3300875B2 JP3300875B2 (en) 2002-07-08

Family

ID=13059933

Family Applications (1)

Application Number Title Priority Date Filing Date
JP05758596A Expired - Fee Related JP3300875B2 (en) 1996-03-14 1996-03-14 Lighting circuit for vehicle discharge lamps

Country Status (2)

Country Link
JP (1) JP3300875B2 (en)
DE (1) DE19710691A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6392364B1 (en) 1999-06-21 2002-05-21 Denso Corporation High voltage discharge lamp apparatus for vehicles
US6670764B2 (en) 2001-02-28 2003-12-30 Denso Corporation Discharge lamp unit with noise shields and noise control method for discharge lamp unit
JP2007066920A (en) * 2006-12-11 2007-03-15 Matsushita Electric Works Ltd Discharge lamp lighting device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6201350B1 (en) * 1998-11-20 2001-03-13 Denso Corporation Discharge lamp lightning apparatus and manufacturing method therefor
JP4604429B2 (en) * 2001-08-27 2011-01-05 株式会社デンソー Discharge lamp equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6392364B1 (en) 1999-06-21 2002-05-21 Denso Corporation High voltage discharge lamp apparatus for vehicles
US6670764B2 (en) 2001-02-28 2003-12-30 Denso Corporation Discharge lamp unit with noise shields and noise control method for discharge lamp unit
JP2007066920A (en) * 2006-12-11 2007-03-15 Matsushita Electric Works Ltd Discharge lamp lighting device

Also Published As

Publication number Publication date
DE19710691A1 (en) 1997-10-30
JP3300875B2 (en) 2002-07-08

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