JPH05226083A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting deviceInfo
- Publication number
- JPH05226083A JPH05226083A JP2817492A JP2817492A JPH05226083A JP H05226083 A JPH05226083 A JP H05226083A JP 2817492 A JP2817492 A JP 2817492A JP 2817492 A JP2817492 A JP 2817492A JP H05226083 A JPH05226083 A JP H05226083A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- circuit
- power
- tube
- tube voltage
- 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
Links
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、放電灯の管電圧を検
出して管電流の設定を行う瞬時点灯型の放電灯点灯装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instantaneous lighting type discharge lamp lighting device which detects a tube voltage of a discharge lamp and sets a tube current.
【０００２】[0002]
【従来の技術】図３は瞬時点灯可能な従来の放電灯点灯
装置の回路構成を示すブロック図であり、例えば３５Ｗ
程度の小形メタルハライドランプの点灯回路の構成を示
している。同図において、１は直流電源、２はその直流
を交流に変換するインバータ回路、３は放電灯４を起動
させる起動部回路で、起動用の高圧パルスを発生する。2. Description of the Related Art FIG. 3 is a block diagram showing a circuit configuration of a conventional discharge lamp lighting device capable of instantaneous lighting, for example, 35 W.
The structure of the lighting circuit of a small metal halide lamp is shown. In the figure, 1 is a direct current power source, 2 is an inverter circuit for converting the direct current into alternating current, and 3 is a starter circuit for starting the discharge lamp 4, which generates a high voltage pulse for starting.
【０００３】また、５は放電灯４の管電圧を検出する管
電圧検出回路、６は放電灯４の管電流を検出する管電流
検出回路、７は検出した管電圧及び管電流に応じてイン
バータ回路２の放電灯４に対する出力を制御する制御回
路である。Further, 5 is a tube voltage detecting circuit for detecting the tube voltage of the discharge lamp 4, 6 is a tube current detecting circuit for detecting the tube current of the discharge lamp 4, and 7 is an inverter according to the detected tube voltage and tube current. It is a control circuit that controls the output of the circuit 2 to the discharge lamp 4.
【０００４】上記のように構成された点灯装置におい
て、直流電源１を投入すると、起動部回路３より高圧パ
ルスが発生し、この高圧パルスが放電灯４に印加され
る。これにより、放電灯４内で放電が開始され、さらに
インバータ回路２の出力電流によりアーク放電へと進
み、放電灯４の発光量が増加して安定状態（定常状態）
へと移行する。In the lighting device constructed as described above, when the DC power supply 1 is turned on, a high-voltage pulse is generated from the starter circuit 3, and this high-voltage pulse is applied to the discharge lamp 4. As a result, discharge is started in the discharge lamp 4, and further the output current of the inverter circuit 2 advances to arc discharge, and the amount of light emitted from the discharge lamp 4 increases to a stable state (steady state).
Transition to.
【０００５】ここで、放電灯４の点灯時の発光量の立上
りを速くして瞬時点灯を行うには、放電灯４の管電圧を
検出して管電流を制御しなければならない。図４は瞬時
点灯を行った場合の光束ｌｍの立上りの一般的な例を示
したものである。点灯直後の管電圧の低い時は最大管電
流を流してウォームアップをする。そして、管電圧が上
昇して最大電力になったら管電流を徐々に定格電力にな
るまで減少させて、安定状態で点灯させる。Here, in order to speed up the rise of the amount of light emitted when the discharge lamp 4 is turned on for instantaneous lighting, it is necessary to detect the tube voltage of the discharge lamp 4 and control the tube current. FIG. 4 shows a general example of rising of the luminous flux lm when instantaneous lighting is performed. When the tube voltage is low immediately after lighting, the maximum tube current is passed to warm up. Then, when the tube voltage rises and reaches the maximum power, the tube current is gradually reduced to the rated power, and the lamp is lit in a stable state.
【０００６】また、放電灯４を連続点灯後、少しの間中
断して再点灯させるような場合は、管電圧がある程度高
くなっているので、ウォームアップのための管電流はそ
れに対応して減少させるようにする。Further, when the discharge lamp 4 is continuously lit and then interrupted for a short time to be lit again, since the tube voltage is high to some extent, the tube current for warming up decreases correspondingly. I will let you.
【０００７】[0007]
【発明が解決しようとする課題】ところで、上記のよう
な従来の放電灯点灯装置にあっては、放電灯の管電圧を
検出して管電流を制御しようとする場合、点灯直後のウ
ォームアップ電流は放電灯の状態とある程度の相関があ
るので適当に決められるが、光束は放電灯の温度による
管内部の圧力に大きく影響されるので、過電力時はさら
に明るくなり、また温度上昇は時間的遅れがあるので、
一定電力時でも放電灯の温度が安定して管内部の圧力が
一定になるまで光束がだんだん上昇していくという現象
がある。In the conventional discharge lamp lighting device as described above, when the tube voltage of the discharge lamp is detected to control the tube current, the warm-up current immediately after lighting is increased. Is determined appropriately because it has a certain degree of correlation with the state of the discharge lamp, but since the luminous flux is greatly influenced by the pressure inside the tube due to the temperature of the discharge lamp, it becomes brighter when overpowered, and the temperature rise is temporal Because there is a delay
There is a phenomenon that the luminous flux gradually rises until the temperature of the discharge lamp becomes stable and the pressure inside the tube becomes constant even at constant power.
【０００８】このため、ウォームアップ領域と定格領域
の間で光束が大きく低下してアンダーシュート現象が発
生し、不自然な減光感があるという問題点があった。ま
た、アンダーシュートを減らそうとすると最大電力時の
光束のオーバーシュートを極度に大きくする必要があ
り、したがって放電灯の劣化が促進され、寿命が短くな
る恐れがあるという問題点があった。For this reason, there is a problem in that the luminous flux is greatly reduced between the warm-up area and the rated area to cause an undershoot phenomenon, resulting in an unnatural dimming feeling. Further, in order to reduce the undershoot, it is necessary to extremely increase the overshoot of the luminous flux at the maximum power, which accelerates the deterioration of the discharge lamp and may shorten the life of the discharge lamp.
【０００９】この発明は、上記のような問題点に着目し
てなされたもので、放電灯点灯時のアンダーシュートに
よる不自然な減光感をなくし、また放電灯が劣化して寿
命が短くなることのない放電灯点灯装置を得ることを目
的としている。The present invention has been made by paying attention to the above-mentioned problems, and eliminates an unnatural dimming feeling due to undershoot when the discharge lamp is lit, and the discharge lamp is deteriorated to shorten its life. The purpose of the present invention is to obtain a discharge lamp lighting device that does not exist.
【００１０】[0010]
【課題を解決するための手段】この発明の放電灯点灯装
置は、放電灯の管電圧を検出する管電圧検出回路と、そ
の検出電圧に応じて管電流を制御する制御回路と、放電
灯のコールドスタート時に該放電灯への供給電力を徐々
に低下させる補正回路とを備えたものである。DISCLOSURE OF THE INVENTION A discharge lamp lighting device according to the present invention includes a tube voltage detection circuit for detecting a tube voltage of a discharge lamp, a control circuit for controlling a tube current in accordance with the detected voltage, and a discharge lamp And a correction circuit for gradually reducing the power supplied to the discharge lamp at cold start.
【００１１】また上記補正回路は、放電灯の電力が最大
になったことを検出する電力検出回路と、管電圧検出回
路の検出信号から放電灯がコールドスタートかホットス
タートかを判別する判別回路と、この判別回路がコール
ドスタートを判別しかつ前記電力検出回路が最大電力を
検出した直後に放電灯への供給電力を定格まで所定時間
で移行させるシーケンス回路とにより構成したものであ
る。Further, the correction circuit includes a power detection circuit for detecting that the power of the discharge lamp has become maximum, and a determination circuit for determining whether the discharge lamp is cold start or hot start based on the detection signal of the tube voltage detection circuit. The sequence circuit determines the cold start by the determination circuit and shifts the power supplied to the discharge lamp to the rated value in a predetermined time immediately after the power detection circuit detects the maximum power.
【００１２】[0012]
【作用】この発明の放電灯点灯装置においては、放電灯
の点灯時に管電圧に応じて管電流が制御され、また放電
灯のコールドスタート時には補正回路により放電灯への
供給電力が徐々に低下される。In the discharge lamp lighting device of the present invention, the tube current is controlled according to the tube voltage when the discharge lamp is lit, and the power supplied to the discharge lamp is gradually reduced by the correction circuit when the discharge lamp is cold started. It
【００１３】[0013]
【実施例】図１はこの発明の一実施例による放電灯点灯
装置の回路構成を示すブロック図であり、図３と同一符
号は同一構成部分を示している。図において、１は直流
電源、２はその直流を交流に変換するインバータ回路、
３は放電灯４を起動させる起動部回路、５は放電灯４の
管電圧を検出する管電圧検出回路、６は放電灯４の管電
流を検出する管電流検出回路、７はインバータ回路２の
出力を制御する制御回路で、上記検出した放電灯４の管
電圧に応じて管電流を制御する。1 is a block diagram showing a circuit configuration of a discharge lamp lighting device according to an embodiment of the present invention, and the same reference numerals as those in FIG. 3 denote the same components. In the figure, 1 is a DC power supply, 2 is an inverter circuit for converting the DC to AC,
3 is a starter circuit for starting the discharge lamp 4, 5 is a tube voltage detection circuit for detecting the tube voltage of the discharge lamp 4, 6 is a tube current detection circuit for detecting the tube current of the discharge lamp 4, and 7 is an inverter circuit 2. A control circuit for controlling the output controls the tube current according to the detected tube voltage of the discharge lamp 4.
【００１４】８は放電灯４のアンダーシュートの影響を
補正する補正回路で、放電灯４のコールドスタート時に
該放電灯４への供給電力を最大から定格まで徐々に低下
させる。またこの補正回路８は、ウォームアップ時に放
電灯４のピーク電力が最大（７５Ｗ程度）になったこと
を検出する電力ピーク検出回路９と、管電圧検出回路５
の検出信号から放電灯４がウォームアップ動作が必要な
コールドスタート状態かウォームアップ動作が不必要な
ホットリスタート状態かを判別する判別回路１０と、こ
の判別回路１０がコールドスタート状態と判別しかつ上
記電力ピーク検出回路９が最大電力を検出した直後に放
電灯４への供給電力を定格電力まで所定時間で移行させ
るシーケンス回路１１とにより構成されている。Reference numeral 8 is a correction circuit for correcting the effect of undershoot of the discharge lamp 4, and gradually reduces the power supplied to the discharge lamp 4 from the maximum to the rating when the discharge lamp 4 is cold started. The correction circuit 8 includes a power peak detection circuit 9 that detects that the peak power of the discharge lamp 4 has reached the maximum (about 75 W) during warm-up, and a tube voltage detection circuit 5.
And a determination circuit 10 that determines whether the discharge lamp 4 is in a cold start state in which a warm-up operation is required or in a hot restart state in which a warm-up operation is not required, and the determination circuit 10 determines a cold start state. A sequence circuit 11 that shifts the power supplied to the discharge lamp 4 to the rated power in a predetermined time immediately after the power peak detection circuit 9 detects the maximum power.
【００１５】次に動作について説明する。直流電源１か
らの電源がインバータ回路２に入力されると、起動部回
路３からの高圧パルスにより放電灯４が放電を開始し、
その後インバータ回路２の出力により放電灯４は定常状
態で点灯し続ける。その際、制御回路７は管電圧検出回
路５で検出した放電灯４の管電圧に応じて管電流を制御
しており、放電灯４は瞬時に点灯して安定状態となる。Next, the operation will be described. When the power source from the DC power source 1 is input to the inverter circuit 2, the discharge lamp 4 starts discharging due to the high-voltage pulse from the starting unit circuit 3,
After that, the discharge lamp 4 continues to light in a steady state by the output of the inverter circuit 2. At that time, the control circuit 7 controls the tube current according to the tube voltage of the discharge lamp 4 detected by the tube voltage detection circuit 5, and the discharge lamp 4 is instantly turned on and becomes stable.
【００１６】ここで、放電灯４のコールドスタート時に
は補正回路８が動作し、放電灯４のアンダーシュート現
象の発生が抑制される。すなわち、この時上記シーケン
ス回路１１により、放電灯４への印加電力が最大の７５
Ｗ程度から１〜２秒の時間で５０Ｗ程度までスムーズに
低下され、その後図４のアンダーシュートが発生してい
た時間を過ぎるまで徐々に５０Ｗから定格の３５Ｗに低
下される。このため、点灯時のアンダーシュートによる
不自然な減光感がなく、また放電灯４が劣化して寿命が
短くなることもない。At the cold start of the discharge lamp 4, the correction circuit 8 operates to suppress the occurrence of the undershoot phenomenon of the discharge lamp 4. That is, at this time, the sequence circuit 11 causes the maximum applied power to the discharge lamp 4 to be 75
It is smoothly reduced from about W to about 50 W in a time of 1 to 2 seconds, and then gradually reduced from 50 W to the rated 35 W until the time when the undershoot of FIG. 4 occurs. Therefore, there is no unnatural dimming sensation due to undershoot at the time of lighting, and the discharge lamp 4 does not deteriorate and its life is not shortened.
【００１７】また、消灯直後のような放電灯４がまだ高
温状態にある時の起動、つまりホットリスタート時に
は、判別回路１０が管電圧検出回路５からの信号により
高温状態であることを検出し、ホットリスタート状態で
あると判別するので、シーケンス回路１１は動作せず、
放電灯４が安定するまで管電圧により管電流を制御する
ことになる。Further, when the discharge lamp 4 is still in a high temperature state immediately after being turned off, that is, at the time of hot restart, the discrimination circuit 10 detects from the signal from the tube voltage detection circuit 5 that it is in a high temperature state. , The sequence circuit 11 does not operate because the hot restart state is determined,
The tube current is controlled by the tube voltage until the discharge lamp 4 becomes stable.
【００１８】図２は上記補正回路８による放電灯４の管
電圧ＶＬ・管電流ＩＬと光束ｌｍの立上り特性を示した
もので、（ａ）はコールドスタート時の変化の様子、
（ｂ）はホットリスタート時の変化の様子をそれぞれ示
している。FIG. 2 shows the rising characteristics of the tube voltage VL, the tube current IL, and the luminous flux lm of the discharge lamp 4 by the correction circuit 8, where (a) shows the state of change at the cold start,
(B) shows the state of changes at the time of hot restart.
【００１９】コールドスタート時には、上記のようにシ
ーケンス回路１１が働くので、（ａ）のように放電灯４
の印加電力は最大から徐々に低下し、光束は７５Ｗの最
大電力時に多少オーバーシュートした後は安定状態とな
り、アンダーシュートは目視ではほとんど確認できない
程度に改善される。またホットリスタート時には、補正
回路８が動作せず、（ｂ）のように制御回路７が通常の
管電圧を検出して管電流を制御するのみである。At the cold start, since the sequence circuit 11 operates as described above, the discharge lamp 4 is operated as shown in (a).
The applied power of 1 is gradually decreased from the maximum, and the luminous flux is in a stable state after a little overshoot at the maximum power of 75 W, and the undershoot is improved to a degree that can hardly be visually confirmed. Further, at the time of hot restart, the correction circuit 8 does not operate, and the control circuit 7 only detects the normal tube voltage and controls the tube current as shown in (b).
【００２０】このようにしてアンダーシュートが改善さ
れるので、最大管電力のオーバーシュートを大きくして
放電灯４の管温度を速く立上げる必要がなく、上記のよ
うに放電灯４の劣化は抑えられる。また、コールドスタ
ート時にアンダーシュートは少ないが、ホットリスター
トではオーバーシュートが極度に大きくなるという動作
のズレもなくなる。Since the undershoot is improved in this way, it is not necessary to increase the overshoot of the maximum tube power to raise the tube temperature of the discharge lamp 4 quickly, and the deterioration of the discharge lamp 4 is suppressed as described above. Be done. In addition, there is little undershoot at cold start, but there is no deviation in operation that causes excessive overshoot at hot restart.
【００２１】[0021]
【発明の効果】以上のように、この発明によれば、放電
灯のコールドスタート時に該放電灯への供給電力を徐々
に低下させる補正回路を設けたため、放電灯点灯時のア
ンダーシュートによる不自然な減光感がなく、また放電
灯が劣化して寿命が短くなることもないという効果があ
る。As described above, according to the present invention, since the correction circuit for gradually decreasing the electric power supplied to the discharge lamp at the cold start of the discharge lamp is provided, the unnaturalness due to the undershoot at the time of lighting the discharge lamp is caused. There is an effect that there is no such a feeling of dimming and that the life of the discharge lamp is not shortened due to deterioration.
【図１】 この発明の一実施例の構成を示すブロック図FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
【図２】 図１の補正回路による放電灯の管電圧・管電
流と光束の立上り特性図FIG. 2 is a rise voltage characteristic diagram of a tube voltage / tube current and a luminous flux of a discharge lamp by the correction circuit of FIG.
【図３】 従来例の構成を示すブロック図FIG. 3 is a block diagram showing a configuration of a conventional example.
【図４】 放電灯の光束の立上りの一般的な例を示す特
性図FIG. 4 is a characteristic diagram showing a general example of rising of a luminous flux of a discharge lamp.
１ 直流電源 ２ インバータ回路 ４ 放電灯 ５ 管電圧検出回路 ６ 管電流検出回路 ７ 制御回路 ８ 補正回路 ９ 電力ピーク検出回路 １０ 判別回路 １１ シーケンス回路 1 DC power supply 2 Inverter circuit 4 Discharge lamp 5 Tube voltage detection circuit 6 Tube current detection circuit 7 Control circuit 8 Correction circuit 9 Power peak detection circuit 10 Discrimination circuit 11 Sequence circuit
Claims (2)
路と、その検出電圧に応じて管電流を制御する制御回路
と、放電灯のコールドスタート時に該放電灯への供給電
力を徐々に低下させる補正回路とを備えたことを特徴と
する放電灯点灯装置。1. A tube voltage detection circuit for detecting a tube voltage of a discharge lamp, a control circuit for controlling a tube current in accordance with the detected voltage, and a power supply to the discharge lamp gradually at cold start of the discharge lamp. A discharge lamp lighting device, comprising: a correction circuit for lowering the voltage.
たことを検出する電力検出回路と、管電圧検出回路の検
出信号から放電灯がコールドスタートかホットスタート
かを判別する判別回路と、この判別回路がコールドスタ
ートを判別しかつ前記電力検出回路が最大電力を検出し
た直後に放電灯への供給電力を定格まで所定時間で移行
させるシーケンス回路とにより構成したことを特徴とす
る請求項１記載の放電灯点灯装置。2. The correction circuit includes a power detection circuit that detects that the electric power of the discharge lamp has become maximum, and a determination circuit that determines whether the discharge lamp is cold start or hot start based on a detection signal of the tube voltage detection circuit. And a sequence circuit that shifts the power supplied to the discharge lamp to a rated value in a predetermined time immediately after the determination circuit determines a cold start and the power detection circuit detects the maximum power. The discharge lamp lighting device according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02817492A JP3195990B2 (en) | 1992-02-14 | 1992-02-14 | Discharge lamp lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02817492A JP3195990B2 (en) | 1992-02-14 | 1992-02-14 | Discharge lamp lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05226083A true JPH05226083A (en) | 1993-09-03 |
| JP3195990B2 JP3195990B2 (en) | 2001-08-06 |
Family
ID=12241369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02817492A Expired - Fee Related JP3195990B2 (en) | 1992-02-14 | 1992-02-14 | Discharge lamp lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3195990B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003022014A1 (en) * | 2001-08-29 | 2003-03-13 | Harison Toshiba Lighting Corp. | High-voltage discharge lamp lighting apparatus and automobile headlight apparatus |
| JP2007141584A (en) * | 2005-11-16 | 2007-06-07 | Iwasaki Electric Co Ltd | Lighting control unit and lighting control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02136343A (en) * | 1988-11-15 | 1990-05-24 | Koito Mfg Co Ltd | Lighting circuit of high-voltage discharge lamp for vehicle |
| JPH02136342A (en) * | 1988-11-15 | 1990-05-24 | Koito Mfg Co Ltd | Lighting circuit of high-pressure discharge lamp for vehicle |
| JPH038299A (en) * | 1989-06-02 | 1991-01-16 | Koito Mfg Co Ltd | Lighting circuit for high-pressure discharge lamp for vehicle |
-
1992
- 1992-02-14 JP JP02817492A patent/JP3195990B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02136343A (en) * | 1988-11-15 | 1990-05-24 | Koito Mfg Co Ltd | Lighting circuit of high-voltage discharge lamp for vehicle |
| JPH02136342A (en) * | 1988-11-15 | 1990-05-24 | Koito Mfg Co Ltd | Lighting circuit of high-pressure discharge lamp for vehicle |
| JPH038299A (en) * | 1989-06-02 | 1991-01-16 | Koito Mfg Co Ltd | Lighting circuit for high-pressure discharge lamp for vehicle |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003022014A1 (en) * | 2001-08-29 | 2003-03-13 | Harison Toshiba Lighting Corp. | High-voltage discharge lamp lighting apparatus and automobile headlight apparatus |
| US6850015B2 (en) | 2001-08-29 | 2005-02-01 | Harison Toshiba Lighting Corp. | High pressure discharge lamp starter device and an automotive headlight device |
| JP2007141584A (en) * | 2005-11-16 | 2007-06-07 | Iwasaki Electric Co Ltd | Lighting control unit and lighting control method |
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| Publication number | Publication date |
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| JP3195990B2 (en) | 2001-08-06 |
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