JPH04144097A - Control device for discharge lamp - Google Patents
Control device for discharge lampInfo
- Publication number
- JPH04144097A JPH04144097A JP2266199A JP26619990A JPH04144097A JP H04144097 A JPH04144097 A JP H04144097A JP 2266199 A JP2266199 A JP 2266199A JP 26619990 A JP26619990 A JP 26619990A JP H04144097 A JPH04144097 A JP H04144097A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- discharge
- current
- discharge current
- converter
- 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
- 230000010355 oscillation Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
この発明は、自動用ヘッドランプなどに利用される放電
灯の制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a control device for a discharge lamp used in an automatic headlamp or the like.
（従来の技術）
従来の放電灯の制御装置としては、例えば第５図に示す
ようなものがある。直流電源である！＜ッテリの電圧は
、ＤＣ−ＡＣ変換器１を経て、放電灯起動電圧発生部３
を介し放電灯５に与えられる。このうちＤＣ−ＡＣ変換
器１においては、バッテリの電圧を、発振器７の制御に
よるスイッチング動作により交流電圧とし、さらにトラ
ンス９で昇圧させる。また、放電灯起動電圧発生部３で
は、前記昇圧された交流電圧を、さらに放電ギャップと
パルストランス１１のインダクタンスとにより、数倍か
ら士数倍に昇圧し、放電灯５内部で絶縁破壊を発生する
のに充分な電圧とし、放電灯５へ印加する。そして、こ
の放電灯起動電圧発生部３の作動により、放電灯５の内
部で絶縁破壊が発生したのちは、放電灯５は連続点灯状
態となる。(Prior Art) As a conventional discharge lamp control device, there is one shown in FIG. 5, for example. It’s a DC power source! <The battery voltage passes through the DC-AC converter 1 and is then supplied to the discharge lamp starting voltage generator 3.
is applied to the discharge lamp 5 via. In the DC-AC converter 1 , the voltage of the battery is converted into an alternating current voltage by a switching operation controlled by an oscillator 7 , and further boosted by a transformer 9 . Further, in the discharge lamp starting voltage generation unit 3, the boosted AC voltage is further boosted from several times to several times by the inductance of the discharge gap and the pulse transformer 11, causing dielectric breakdown inside the discharge lamp 5. A sufficient voltage is applied to the discharge lamp 5. After dielectric breakdown occurs inside the discharge lamp 5 due to the operation of the discharge lamp starting voltage generating section 3, the discharge lamp 5 enters a continuous lighting state.
（発明が解決しようとする課題）
しかしながら、このような従来の放電灯の制御装置にあ
っては、ＤＣ−ＡＣ変換器１の発振器７は単一制御周波
数をもっているだけてあり、直流電源側の入力電圧の変
動により放電灯５の光量変化が発生し、下記の問題を生
しる。(Problem to be Solved by the Invention) However, in such a conventional discharge lamp control device, the oscillator 7 of the DC-AC converter 1 only has a single control frequency, and the oscillator 7 of the DC-AC converter 1 has a single control frequency. Fluctuations in the input voltage cause changes in the amount of light from the discharge lamp 5, resulting in the following problems.
（１）投光対象物の明るさが変化し、商品たる放電灯の
商品性として好ましくない。(1) The brightness of the object to be illuminated changes, which is unfavorable in terms of marketability of the discharge lamp.
（１１）放電灯の光量が変化するということは、放電灯
を流れるバルブ電流が変化することにもなり、放電灯の
バルブ寿命も異なってくるので、寿命保証が困難となる
。(11) A change in the amount of light from a discharge lamp also means a change in the bulb current flowing through the discharge lamp, which also changes the bulb life of the discharge lamp, making it difficult to guarantee its life.
ところで、放電灯５で絶縁破壊を起こすと、火花放電が
起る。この火花放電時は放電灯５の内部が全路破壊を起
こしているため、−瞬の短絡状態となり、放電灯５の両
端電圧は一気に低下するが、同時に熱電子が陰極から自
励放出されるアーク放電へと移行していく。アーク放電
が開始されると、やがて、放電灯５内の温度が上昇し、
金属が十分蒸発すると放電路の抵抗が増し、第４図経路
Ａで示すように電流値が所定値に落着いて発光量も安定
する。従って、この放電電流が一定であれば発光量も一
定となる。そして、発光量は電流値に依存し、電流か絞
り込まれると、放電灯５の光度値も非常に小さくなる。By the way, when dielectric breakdown occurs in the discharge lamp 5, spark discharge occurs. During this spark discharge, all circuits inside the discharge lamp 5 are destroyed, resulting in an instantaneous short circuit, and the voltage across the discharge lamp 5 drops at once, but at the same time, thermoelectrons are self-excited and emitted from the cathode. The process progresses to arc discharge. When arc discharge starts, the temperature inside the discharge lamp 5 will eventually rise,
When the metal evaporates sufficiently, the resistance of the discharge path increases, the current value settles to a predetermined value as shown by path A in FIG. 4, and the amount of light emission becomes stable. Therefore, if this discharge current is constant, the amount of light emission will also be constant. The amount of light emitted depends on the current value, and when the current is narrowed down, the luminous intensity value of the discharge lamp 5 also becomes very small.
そこでこの発明は、この放電電流に着目し、放電電流が
所定の放電電流となるように制御することで、放電灯の
光量の変化を押さえることのできる放電灯の制御装置を
提供することを目的とする。Therefore, an object of the present invention is to provide a discharge lamp control device that can suppress changes in the light amount of a discharge lamp by focusing on this discharge current and controlling the discharge current so that it becomes a predetermined discharge current. shall be.
［発明の構成コ
（課題を解決するための手段）
この発明は、周波数による制御で入力電圧を交流に変換
して放電灯に印加するＤＣ／ＡＣ変換器を備えた放電灯
の制御装置であって、放電灯の放電電流を検出する手段
を設け、この検出放電電流が所定の放電電流となるよう
前記周波数を調整する手段を設けたものである。[Configuration of the Invention (Means for Solving the Problems) The present invention is a discharge lamp control device equipped with a DC/AC converter that converts input voltage into alternating current and applies it to the discharge lamp under frequency control. Accordingly, means for detecting the discharge current of the discharge lamp is provided, and means for adjusting the frequency so that the detected discharge current becomes a predetermined discharge current.
また、入力電圧を交流に変換して放電灯に印加するＤ
Ｃ／ Ａ、 Ｃ変換器を備えた放電灯の制御装置であっ
て、前記ＤＣ／ＡＣ変換器のＤＣ側電圧を所定電圧に調
整する手段を設けたものである。In addition, D
This is a control device for a discharge lamp equipped with a C/A, C converter, and is provided with means for adjusting the DC side voltage of the DC/AC converter to a predetermined voltage.
（作用）
上記構成によれば、例えばＤＣ／ＡＣ変換器の制御周波
数を検出放電電流が所定の放電電流となるように制御す
ることにより、入力電圧が変動しても放電電流を一定と
することができる。また、ＤＣ／ＡＣ変換器のＤＣ側に
ＤＣ／ＤＣ制御回路を備えることでＤＣ側電圧を常に所
定の電圧とし、放電電流を一定にすることが可能である
。(Function) According to the above configuration, for example, by controlling the control frequency of the DC/AC converter so that the detected discharge current becomes a predetermined discharge current, the discharge current can be kept constant even if the input voltage fluctuates. I can do it. Furthermore, by providing a DC/DC control circuit on the DC side of the DC/AC converter, it is possible to always keep the DC side voltage at a predetermined voltage and to keep the discharge current constant.
（実施例）
以下、この発明の第一実施例を第１図および第２図にお
いて説明する。(Example) A first example of the present invention will be described below with reference to FIGS. 1 and 2.
第１図は本実施例の放電灯の制御装置を示す。FIG. 1 shows a control device for a discharge lamp according to this embodiment.
従来例を示す第４図と同一の部分については同一の番号
を付す。パルストランス１１内に検出手段として電流検
出用コイル１３を備え、放電灯５の放電電流を検出する
。この検出された放電電流の変動に伴ない、制御手段た
る周波数調整手段としての発振周波数制御回路１５が、
ＤＣ／ＡＣ変換器１への制御周波数を制御し、放電灯５
の放電電流が所定の放電電流となるように調整する。こ
の刺−は、前記検出された放電電流が一定となるように
おこなわれる。但し、放電灯５の減光のため所定の放電
電流を変えるように構成したときは、放電灯５の放電電
流がこの変更後の所定放電電流となるように調整する。The same parts as in FIG. 4 showing the conventional example are given the same numbers. A current detection coil 13 is provided as a detection means in the pulse transformer 11 to detect the discharge current of the discharge lamp 5. According to the fluctuation of the detected discharge current, the oscillation frequency control circuit 15 as a frequency adjustment means, which is a control means,
The control frequency to the DC/AC converter 1 is controlled, and the discharge lamp 5
The discharge current is adjusted so that it becomes a predetermined discharge current. This pricking is performed so that the detected discharge current becomes constant. However, when configured to change the predetermined discharge current for dimming the discharge lamp 5, the discharge current of the discharge lamp 5 is adjusted so as to become the predetermined discharge current after this change.
つぎに本実施例の作用を、その原理と共に説明する。Next, the operation of this embodiment will be explained together with its principle.
まず、放電灯５が点灯状態にある場合において、最も簡
略化したモデルを考えると、第２図のようになる。ここ
でＲは放電抵抗（放電が第４図経路Ａのように安定した
ものと考え、時間への依存性はないものとする）、Ｌは
系のインダクタンス、Ａ （ｘ）はＤＣ側入力電圧、ω
は制御周波数（ＤＣ／ＡＣ変換器のスイッチング周波数
）、ｔは時間である。この時、放電電流Ｉは
１＝Ａ （ｘ）ｅ”” （Ｒ−ｊωＬ）／ （Ｒ２＋
ω２Ｌ２）
となる。この式かられかるように、入力電圧Ａ（ｘ）が
変化しても、制御周波数ωを制御することで放電電流■
を所定の放電電流として一定にするとかできる。このこ
とは、制御周波数ωを変化させることで、インダクタン
スＬの部分のインビ−ダンスＺ、すなわち、
を変化させ放電電流ｌをほぼ一定値にするものであると
も言える。First, when considering the most simplified model when the discharge lamp 5 is in a lit state, it becomes as shown in FIG. 2. Here, R is the discharge resistance (assuming that the discharge is stable as shown in path A in Figure 4 and has no dependence on time), L is the inductance of the system, and A (x) is the DC side input voltage. ,ω
is the control frequency (switching frequency of the DC/AC converter) and t is the time. At this time, the discharge current I is 1=A (x)e"" (R-jωL)/(R2+
ω2L2). As can be seen from this equation, even if the input voltage A(x) changes, by controlling the control frequency ω, the discharge current
It is possible to make it constant as a predetermined discharge current. This can also be said to be that by changing the control frequency ω, the impedance Z of the inductance L portion, that is, is changed, and the discharge current l is kept at a substantially constant value.
この原理にもとづき、第１図の発振周波数制御回路は、
検出した放電電流Ｉを一定とするように、制御周波数ω
を制御する。Based on this principle, the oscillation frequency control circuit shown in Figure 1 is
The control frequency ω is adjusted so that the detected discharge current I is kept constant.
control.
従って、放電灯５の光量が一定となり、対象物の見え方
が安定する。また、放電電流を一定とすることにより、
放電灯５のバルブ寿命を安定させ、バルブの交換時期な
どを従来より正確に設定できる。Therefore, the amount of light from the discharge lamp 5 becomes constant, and the appearance of the object becomes stable. Also, by keeping the discharge current constant,
The bulb life of the discharge lamp 5 can be stabilized, and the bulb replacement timing can be set more accurately than before.
つぎにこの発明の第二実施例を、第３図をもとに説明す
る。Next, a second embodiment of the present invention will be described with reference to FIG.
アーク放電は
に２
Ｖ−Ｋｌ ＋ （Ａｙ ｒ ｔ ｏｎ式）で表わ
される負特性を有するため、制御周波数ωを制御して電
圧間電圧を高くすると、第４図経路Ｂのようにアーク放
電電流は小さくなる。すなわち、制御周波数ωの制御は
ＤＣ／ＡＣ変換器ｌ変換器側入力電圧を制御することに
鑑みれば、ＤＣ／ＡＣ変換器１のＤＣ側入力電圧の変化
が直接放電電流の変化に結びついている。そこで、この
実施例は直流電源側に制御手段たる電圧調整手段として
のＤＣ／ＤＣ制御回路１７を設け、電源からの電圧を直
接に制御してＤＣ／ＡＣ変換器１のＤＣ側電圧を一定に
するものである。これにより放電灯５に印加される電圧
を一定にできる。従って、本実施例によっても、放電灯
５の放電電流を所定の放電電流として一定にでき、光量
の変動を押えることができる。また、本実施例において
は電源側にＤＣ／ＤＣ制御回路１７を設けるという簡単
な構成で、低コストにより光量を一定とする放電灯の＠
御装置を得ることができる。Since arc discharge has a negative characteristic expressed by 2 V-Kl + (Ay r t on formula), if the control frequency ω is controlled to increase the voltage between voltages, the arc discharge current will increase as shown in path B in Figure 4. becomes smaller. In other words, considering that the control frequency ω is controlled by the input voltage on the DC/AC converter 1 converter side, changes in the DC side input voltage of the DC/AC converter 1 are directly linked to changes in the discharge current. . Therefore, in this embodiment, a DC/DC control circuit 17 is provided on the DC power supply side as a voltage adjustment means as a control means, and the voltage from the power supply is directly controlled to keep the DC side voltage of the DC/AC converter 1 constant. It is something to do. This allows the voltage applied to the discharge lamp 5 to be constant. Therefore, according to this embodiment as well, the discharge current of the discharge lamp 5 can be kept constant as a predetermined discharge current, and fluctuations in the amount of light can be suppressed. In addition, in this embodiment, a discharge lamp with a simple configuration in which a DC/DC control circuit 17 is provided on the power supply side is used to maintain a constant amount of light at a low cost.
You can get control equipment.
［発明の効果］
以上説明してきたように、この発明によれば、例えば、
放電灯の放電電流を所定の放電電流とするようＤＣ／Ａ
Ｃ変換器の制御周波数を制御し、またはＤＣ側電圧を一
定に制御することで放電電流を所定の放電電流とし、放
電灯の光量の変動を押さえることかできる。このため投
光対象物の明るさの変化を抑制でき、放電灯のバルブ寿
命も安定させることができる。[Effects of the Invention] As explained above, according to the present invention, for example,
DC/A so that the discharge current of the discharge lamp becomes a predetermined discharge current.
By controlling the control frequency of the C converter or controlling the DC side voltage to be constant, the discharge current can be set to a predetermined discharge current, and fluctuations in the amount of light from the discharge lamp can be suppressed. Therefore, changes in the brightness of the object to be illuminated can be suppressed, and the bulb life of the discharge lamp can be stabilized.
第１図は本発明の第一実施例に係る放電灯の制御回路図
、第２図は第１図を簡略化した回路のモデル図、第３図
は第二実施例の放電灯の制御回路図、第４図は放電後の
アーク電圧−電流特性図、第５図は従来の放電灯の制御
回路図である。
１・・・ＤＣ／ＡＣ変換器
３・・・放電灯起動電圧発生部
５・・・放電灯 ７・・・発振器９・・・ト
ランス １１・・・パルストランス小弁理士三
好秀和
第
図Fig. 1 is a control circuit diagram of a discharge lamp according to a first embodiment of the present invention, Fig. 2 is a simplified model diagram of the circuit of Fig. 1, and Fig. 3 is a control circuit diagram of a discharge lamp according to a second embodiment. 4 is an arc voltage-current characteristic diagram after discharge, and FIG. 5 is a control circuit diagram of a conventional discharge lamp. 1... DC/AC converter 3... Discharge lamp starting voltage generation section 5... Discharge lamp 7... Oscillator 9... Transformer 11... Pulse transformer Small patent attorney Hidekazu Miyoshi Diagram
Claims (2)
電灯に印加するＤＣ／ＡＣ変換器を備えた放電灯の制御
装置であって、放電灯の放電電流を検出する手段を設け
、この検出放電電流が所定の放電電流となるよう前記周
波数を調整する手段を設けたことを特徴とする放電灯の
制御装置。(1) A discharge lamp control device equipped with a DC/AC converter that converts an input voltage into alternating current and applies it to the discharge lamp under frequency control, and is equipped with means for detecting the discharge current of the discharge lamp. A control device for a discharge lamp, comprising means for adjusting the frequency so that the detected discharge current becomes a predetermined discharge current.
／ＡＣ変換器を備えた放電灯の制御装置であって、前記
ＤＣ／ＡＣ変換器のＤＣ側電圧を所定電圧に調整する手
段を設けたことを特徴とする放電灯の制御装置。(2) DC that converts the input voltage to AC and applies it to the discharge lamp
What is claimed is: 1. A control device for a discharge lamp comprising an AC converter, comprising means for adjusting the DC side voltage of the DC/AC converter to a predetermined voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2266199A JPH04144097A (en) | 1990-10-05 | 1990-10-05 | Control device for discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2266199A JPH04144097A (en) | 1990-10-05 | 1990-10-05 | Control device for discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04144097A true JPH04144097A (en) | 1992-05-18 |
Family
ID=17427642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2266199A Pending JPH04144097A (en) | 1990-10-05 | 1990-10-05 | Control device for discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04144097A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS581997A (en) * | 1981-06-08 | 1983-01-07 | オイ・ヘルバ− | Electronic main power supply device for discharge lamp |
| JPS5916100B2 (en) * | 1975-02-26 | 1984-04-13 | ロジヤ−・ジヨゼフ・シエツペル | Hydride-dehydride power plant and power generation method |
| JPS6072189A (en) * | 1983-09-28 | 1985-04-24 | ティーディーケイ株式会社 | Circuit for firing discharge lamp |
| JPS61271794A (en) * | 1985-05-27 | 1986-12-02 | 松下電工株式会社 | Discharge lamp lighting apparatus |
| JPS62259391A (en) * | 1986-03-28 | 1987-11-11 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Circuit arrangement for high voltage discharge lamp operation |
| JPS63301493A (en) * | 1987-05-30 | 1988-12-08 | Kagenari Kokuno | Method of controlling power for discharge lamp and electron ballast applied thereto |
| JPH01213996A (en) * | 1988-01-06 | 1989-08-28 | Philips Gloeilampenfab:Nv | Lighting and feeding circuit for gas discharge lamp |
| JPH02177298A (en) * | 1988-12-28 | 1990-07-10 | Eye Lighting Syst Corp | Discharge lamp lighting device |
-
1990
- 1990-10-05 JP JP2266199A patent/JPH04144097A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5916100B2 (en) * | 1975-02-26 | 1984-04-13 | ロジヤ−・ジヨゼフ・シエツペル | Hydride-dehydride power plant and power generation method |
| JPS581997A (en) * | 1981-06-08 | 1983-01-07 | オイ・ヘルバ− | Electronic main power supply device for discharge lamp |
| JPS6072189A (en) * | 1983-09-28 | 1985-04-24 | ティーディーケイ株式会社 | Circuit for firing discharge lamp |
| JPS61271794A (en) * | 1985-05-27 | 1986-12-02 | 松下電工株式会社 | Discharge lamp lighting apparatus |
| JPS62259391A (en) * | 1986-03-28 | 1987-11-11 | エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン | Circuit arrangement for high voltage discharge lamp operation |
| JPS63301493A (en) * | 1987-05-30 | 1988-12-08 | Kagenari Kokuno | Method of controlling power for discharge lamp and electron ballast applied thereto |
| JPH01213996A (en) * | 1988-01-06 | 1989-08-28 | Philips Gloeilampenfab:Nv | Lighting and feeding circuit for gas discharge lamp |
| JPH02177298A (en) * | 1988-12-28 | 1990-07-10 | Eye Lighting Syst Corp | Discharge lamp lighting device |
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