JPH0645081A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting deviceInfo
- Publication number
- JPH0645081A JPH0645081A JP19976192A JP19976192A JPH0645081A JP H0645081 A JPH0645081 A JP H0645081A JP 19976192 A JP19976192 A JP 19976192A JP 19976192 A JP19976192 A JP 19976192A JP H0645081 A JPH0645081 A JP H0645081A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- power
- voltage
- pressure discharge
- lighting device
- 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、高圧放電灯点灯装置
に関し、特に始動時の特性の改善に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp lighting device and, more particularly, to improvement of starting characteristics.
【０００２】[0002]
【従来の技術】従来の高圧放電灯点灯装置としては、例
えば特開平２−２１５０９０号公報に示されたものが提
案されている。図８は同公報に示された高圧放電灯点灯
装置の回路図である。図８において、１はエネルギー供
給源となる交流電源、２は全波整流器である。なお、車
両のように車載のバッテリを電源とする場合は、交流電
源１と全波整流器２との代わりに、車載のバッテリの１
２Ｖを所定電圧（例えば３００Ｖ程度）に昇圧するＤＣ
−ＤＣコンバータを用いることが出来る。また、３は上
記の直流電力を所定周波数の交流電力に変換するインバ
ータ回路。４はチョークコイルＬとコンデンサＣ1 、Ｃ
2 との直列共振回路、５は放電灯である。また、６は制
御手段であり、インバータ回路３を制御する信号Ｓ1 を
出力する。この制御手段６は専用のアナログ若しくはデ
ィジタル回路、またはマイクロコンピュータ等で構成さ
れる。なお、コンデンサＣ1 とＣ2 の直列回路は、放電
灯５の端子電圧を電圧値ＶC として検出するためのもの
であり、また、放電灯５に直列に接続された抵抗Ｒは、
放電灯５を流れる放電電流を電圧値ＶR として検出する
ためのものである。2. Description of the Related Art As a conventional high pressure discharge lamp lighting device, for example, the one disclosed in Japanese Patent Application Laid-Open No. 2-215090 has been proposed. FIG. 8 is a circuit diagram of the high pressure discharge lamp lighting device disclosed in the publication. In FIG. 8, 1 is an AC power source that serves as an energy supply source, and 2 is a full-wave rectifier. When a vehicle-mounted battery is used as a power source like a vehicle, instead of the AC power source 1 and the full-wave rectifier 2, a vehicle-mounted battery 1 is used.
DC that boosts 2V to a specified voltage (for example, about 300V)
-A DC converter can be used. 3 is an inverter circuit that converts the above DC power into AC power of a predetermined frequency. 4 is a choke coil L and capacitors C 1 and C
A series resonance circuit with 2 and 5 are discharge lamps. Further, 6 is a control means, which outputs a signal S 1 for controlling the inverter circuit 3. The control means 6 is composed of a dedicated analog or digital circuit, a microcomputer, or the like. The series circuit of the capacitors C 1 and C 2 is for detecting the terminal voltage of the discharge lamp 5 as the voltage value V C , and the resistance R connected in series to the discharge lamp 5 is
The discharge current flowing through the discharge lamp 5 is for detecting a voltage value V R.
【０００３】従来の高圧放電灯点灯装置の動作を図９の
フローチャート図を用いて説明する。放電灯の点滅を操
作するライトスイッチ（図示せず）がＯＮにされると、
まず、制御手段６は、信号Ｓ1 の周波数を１００ｋＨｚ
に設定する。それによってインバータ回路３は１００ｋ
Ｈｚの交流電力を発生し、それをＬＣ直列共振回路４に
印加することにより、放電灯５の両端には１０ｋＶ程度
の高電圧が印加される。次に、制御手段６は、コンデン
サＣ1 とＣ2 の接続点の電圧値ＶC 、または抵抗Ｒの電
圧値ＶR から放電灯５で絶縁破壊が生じたか否かを判定
する。なお、ＶC の値は放電灯５の封入ガスが絶縁状態
である場合は高い値を示し、絶縁が破壊されると低い値
になり、ＶR の値は絶縁中は０で、絶縁破壊後は大きく
なるから、ＶC またはＶR の値を所定値Ｖa と比較する
ことによって絶縁破壊が生じたか否かを判別することが
出来る。次に絶縁破壊が生じた場合には、信号Ｓ1 の周
波数を低い値の初期値、例えば４ｋＨｚに設定する。図
８に示すごときＬＣ直列回路においては、ＬＣ直列回路
に印加する電圧を一定にしておいても、その周波数を変
化させると、放電灯に流れる放電電流が変化する。すな
わち、周波数が大きくなるとＬ分によって電流の積分値
が小さくなるので、放電灯に流れる電流が減少する。し
たがって、信号Ｓ1 の周波数を低い値４ｋＨｚに設定し
てやれば、放電電流を大きな値にすることが出来る。次
に、１００ｍｍが経過したか否かを判定し、１００ｍｍ
経過する毎に信号Ｓ1 の周波数を５０Ｈｚづつ増加させ
る。次に、信号Ｓ1 の周波数が６ｋＨｚに達したか否か
を判定し、６ｋＨｚに達すると１００ｍｍ毎に加算する
周波数を１００Ｈｚにする。そして信号Ｓ1 の周波数が
１０ｋＨｚに達すると、その値に固定する。すなわち、
絶縁破壊直後は周波数４ｋＨｚの交流を印加して大電流
を流し、その後４秒間（６ｋＨｚに達するまで）は小幅
に周波数を増加させ、その後は大幅に周波数を増加させ
るように制御する。The operation of the conventional high pressure discharge lamp lighting device will be described with reference to the flowchart of FIG. When a light switch (not shown) for operating the blinking of the discharge lamp is turned on,
First, the control means 6 sets the frequency of the signal S 1 to 100 kHz.
Set to. As a result, the inverter circuit 3 is 100k
By generating AC power of Hz and applying it to the LC series resonance circuit 4, a high voltage of about 10 kV is applied to both ends of the discharge lamp 5. Next, the control means 6 determines from the voltage value V C at the connection point of the capacitors C 1 and C 2 or the voltage value V R of the resistor R whether the dielectric breakdown has occurred in the discharge lamp 5. The value of V C shows a high value when the enclosed gas of the discharge lamp 5 is in an insulating state, and becomes a low value when the insulation is broken, and the value of V R is 0 during the insulation and after the dielectric breakdown. Becomes larger, it is possible to determine whether or not dielectric breakdown has occurred by comparing the value of V C or V R with a predetermined value V a . Next, when dielectric breakdown occurs, the frequency of the signal S 1 is set to a low initial value, for example, 4 kHz. In the LC series circuit as shown in FIG. 8, even if the voltage applied to the LC series circuit is kept constant, if the frequency is changed, the discharge current flowing through the discharge lamp changes. That is, as the frequency increases, the integrated value of the current decreases due to L, so the current flowing through the discharge lamp decreases. Therefore, if the frequency of the signal S 1 is set to a low value of 4 kHz, the discharge current can be increased. Next, it is determined whether 100 mm has passed, and 100 mm
The frequency of the signal S 1 is increased by 50 Hz each time. Next, it is determined whether or not the frequency of the signal S 1 reaches 6 kHz, and when it reaches 6 kHz, the frequency to be added every 100 mm is set to 100 Hz. When the frequency of the signal S 1 reaches 10 kHz, it is fixed at that value. That is,
Immediately after the dielectric breakdown, an alternating current with a frequency of 4 kHz is applied to flow a large current, and then the frequency is controlled to increase slightly for 4 seconds (until 6 kHz is reached), and thereafter, the frequency is controlled to increase significantly.
【０００４】[0004]
【発明が解決しようとする課題】従来の高圧放電灯点灯
装置は以上のように構成されているので、次のような問
題点があった。 （１）個々の放電灯のばらつき、放電灯の経年変化によ
り、同一の電流パターンでは、放電灯点灯時の光の立ち
上がり特性は、まちまちである（図１０）。また、放電
灯によっては、必要以上に電力が供給されてしまい、放
電灯の寿命を著しく短くする（図１１）。 （２）ホットスタートでは必要以上に放電灯に電力が供
給されてしまい、放電灯の寿命を著しく低下する（図１
２）。Since the conventional high pressure discharge lamp lighting device is constructed as described above, it has the following problems. (1) Due to variations in individual discharge lamps and aging of the discharge lamps, the light rising characteristics when the discharge lamps are lit vary with the same current pattern (FIG. 10). Moreover, depending on the discharge lamp, electric power may be supplied more than necessary, which significantly shortens the life of the discharge lamp (FIG. 11). (2) In the hot start, the electric power is supplied to the discharge lamp more than necessary, and the life of the discharge lamp is significantly reduced (Fig. 1).
2).
【０００５】この発明は上記のような問題点を解消する
ためになされたもので、放電灯のばらつき、経年変化、
始動状態よる特性差を吸収でき、始動時に放電灯の光が
オーバーシュートもアンダーシュートもなく、光を速く
定格値にできる放電灯点灯装置を得ることを目的とす
る。The present invention has been made in order to solve the above-mentioned problems, and it has been found that there are variations in discharge lamps, aging,
An object of the present invention is to obtain a discharge lamp lighting device capable of absorbing a characteristic difference depending on a starting state, causing no overshoot or undershoot of light of a discharge lamp at the time of starting, and allowing light to reach a rated value quickly.
【０００６】[0006]
【課題を解決するための手段】請求項１の放電灯点灯装
置は、ヨウ化物系の金属ハロゲン化合物を封入した高圧
放電灯と、この高圧放電灯に電力を供給する電力供給装
置と、前記高圧放電灯の放電灯電圧及び電流を検出する
手段と、前記高圧放電灯の電力が目標電力となるよう前
記電力供給装置の出力電圧または出力電流を変える手段
とを備えた放電灯点灯装置において、前記放電灯電圧の
上昇率を検出する手段と、前記放電灯電圧の上昇率が所
定値以上の間は、前記目標電力を前記高圧放電灯の定格
電力より大きくし、前記上昇率が所定値以下になってか
らは、前記高圧放電灯への供給電力を減少させ前記定格
電力点灯に移行する手段とを具備したものである。According to a first aspect of the present invention, there is provided a discharge lamp lighting device including a high pressure discharge lamp in which an iodide metal halogen compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and the high voltage discharge lamp. In a discharge lamp lighting device comprising means for detecting a discharge lamp voltage and current of a discharge lamp, and means for changing an output voltage or an output current of the power supply device so that the power of the high-pressure discharge lamp becomes a target power, Means for detecting the rate of increase of the discharge lamp voltage, while the rate of increase of the discharge lamp voltage is above a predetermined value, the target power is made larger than the rated power of the high pressure discharge lamp, and the rate of increase is below a predetermined value. After that, means for reducing the power supplied to the high-pressure discharge lamp and switching to the rated power lighting is provided.
【０００７】請求項２の放電灯点灯装置は、ヨウ化物系
の金属ハロゲン化合物を封入した高圧放電灯と、この高
圧放電灯に電力を供給する電力供給装置と、前記高圧放
電灯の放電灯電圧及び電流を検出する手段と、前記高圧
放電灯の電力が目標電力となるよう前記電力供給装置の
出力電圧または出力電流を変える手段とを備えた放電灯
点灯装置において、前記高圧放電灯が消灯後十分な時間
が経過して低い温度状態での点灯時（コールドスター
ト）と、前記高圧放電灯自体の温度が高い状態での再点
灯時（ホットスタート）とで、前記放電灯電圧の上昇率
が所定値以上の場合の前記目標電力、及び前記放電灯電
圧の上昇率が所定値以下の場合の前記目標電力減少速度
を別設定する手段とを具備したものである。A discharge lamp lighting device according to a second aspect of the present invention is a high pressure discharge lamp in which an iodide metal halide compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge lamp voltage of the high pressure discharge lamp. And a means for detecting a current, and a means for changing the output voltage or the output current of the power supply device so that the power of the high-pressure discharge lamp becomes a target power, in the discharge lamp lighting device, after the high-pressure discharge lamp is turned off After a sufficient time has passed, the discharge lamp voltage increases at a low temperature state (cold start) and at a high temperature of the high pressure discharge lamp itself (hot start). It is provided with means for separately setting the target power in the case of a predetermined value or more and the target power decrease rate in the case of an increase rate of the discharge lamp voltage being a predetermined value or less.
【０００８】請求項３の放電灯点灯装置は、ヨウ化物系
の金属ハロゲン化合物を封入した高圧放電灯と、この高
圧放電灯に電力を供給する電力供給装置と、前記高圧放
電灯の放電灯電圧及び電流を検出する手段と、前記高圧
放電灯の電力が目標電力となるよう前記電力供給装置の
出力電圧または出力電流を変える手段とを備えた放電灯
点灯装置において、前記高圧放電灯の点灯直後の前記放
電灯電圧が所定値以上であれば、前記高圧放電灯自体の
温度が高い状態での再点灯時（ホットスタート）、所定
値以下であれば、前記高圧放電灯が消灯後十分な時間が
経過して低い温度状態での点灯時（コールドスタート）
と判定する手段とを具備したものである。A discharge lamp lighting device according to a third aspect of the present invention is a high pressure discharge lamp in which an iodide metal halide compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge lamp voltage of the high pressure discharge lamp. And a means for detecting a current, and means for changing the output voltage or output current of the power supply device so that the power of the high pressure discharge lamp becomes a target power, in the discharge lamp lighting device, immediately after lighting of the high pressure discharge lamp If the discharge lamp voltage is equal to or higher than a predetermined value, the high pressure discharge lamp itself is re-lit when the temperature is high (hot start), and if the voltage is equal to or lower than a predetermined value, the high pressure discharge lamp has sufficient time after being turned off. When the lamp lights up in a low temperature state after a lapse of time (cold start)
And means for determining
【０００９】請求項４の放電灯点灯装置は、ヨウ化物系
の金属ハロゲン化合物を封入した高圧放電灯と、この高
圧放電灯に電力を供給する電力供給装置と、前記高圧放
電灯の放電灯電圧及び電流を検出する手段と、前記高圧
放電灯の電力が目標電力となるよう前記電力供給装置の
出力電圧または出力電流を変える手段とを備えた放電灯
点灯装置において、前回定格点灯時の前記放電灯電圧を
記憶する手段と、前記高圧放電灯の点灯直後の前記放電
灯電圧が、前記前回定格点灯時の前記放電灯電圧よりも
所定値以上低い値であれば、前記高圧放電灯が消灯後十
分な時間が経過して低い温度状態での点灯時（コールド
スタート）、所定値以内であれば、前記高圧放電灯自体
の温度が高い状態での再点灯時（ホットスタート）と判
定する手段とを具備したものである。A discharge lamp lighting device according to a fourth aspect of the present invention is a high pressure discharge lamp in which an iodide metal halide compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge lamp voltage of the high pressure discharge lamp. And a means for detecting current, and means for changing the output voltage or output current of the power supply device so that the power of the high-pressure discharge lamp becomes the target power, in the discharge lamp lighting device, the discharge at the last rated lighting. A means for storing an electric lamp voltage, and the discharge lamp voltage immediately after lighting of the high pressure discharge lamp is a value lower than the discharge lamp voltage at the time of the previous rated lighting by a predetermined value or more, after the high pressure discharge lamp is turned off. When a sufficient time has passed and the lamp is lit in a low temperature state (cold start) and within a predetermined value, a means for determining that the high pressure discharge lamp itself is relighted in a high temperature state (hot start) The ingredients One in which the.
【００１０】[0010]
【作用】請求項１の放電灯点灯装置は、放電灯のばらつ
きを吸収して、放電灯の光出力をオーバーシュートもア
ンダーシュートもなく立ち上げることができる。In the discharge lamp lighting device according to the first aspect of the present invention, variations in the discharge lamp can be absorbed and the light output of the discharge lamp can be raised without overshoot or undershoot.
【００１１】請求項２の放電灯点灯装置は、ホットスタ
ート時とコールドスタート時とで、夫々に適した投入電
力を設定できる。In the discharge lamp lighting device according to the second aspect of the present invention, it is possible to set the applied power suitable for each of the hot start and the cold start.
【００１２】請求項３の放電灯点灯装置は、温度検出装
置等を用いずに、安価にホットスタートとコールドスタ
ートの判定ができる。In the discharge lamp lighting device of the third aspect, it is possible to inexpensively determine hot start and cold start without using a temperature detecting device or the like.
【００１３】請求項４の放電灯点灯装置も、温度検出装
置等を用いずに、安価にホットスタートとコールドスタ
ートの判定ができる。Also in the discharge lamp lighting device according to the fourth aspect, it is possible to inexpensively determine hot start and cold start without using a temperature detecting device or the like.
【００１４】[0014]
実施例１．先ず実施例１の説明に先立ち、この発明の思
想について説明する。図１０〜１２から分かるように、
放電灯電圧は点灯後、徐々に上昇し、放電灯電圧の上昇
に伴い発光効率も上昇する。よって、放電灯電圧から放
電灯発光効率を推定し、その時々の放電灯発光効率に応
じて定格より大きい電力を放電灯に供給することによ
り、始動の際、速やかに放電灯の光束を定格値に達する
ようできる。しかし、個々の放電灯のばらつき、放電灯
の経年変化により、放電灯電圧の立ち上がり特性、放電
灯電圧−放電灯発光効率特性、放電灯電圧の最終値が異
なってしまう。特に放電灯の発光効率が急激に上昇しは
じめる所が放電灯によって異なっているのは、放電灯の
光をオーバーシュートもアンダーシュートも無く立ち上
げる事を困難にしている。例えば、図１１で、放電灯電
圧がＶA の時、放電灯Ａは発光効率１００％に達してい
るので、投入電力は定格電力で良いが、この時点で放電
灯Ｂ、放電灯Ｃの発光効率は、変極点前である為、６０
％に達しておらず、定格電力／０．６以上の投入電力が
必要となる。すなわち、放電灯の発光効率の変極点を検
出して、変極点の前と後で投入電力を切り換える事が、
放電灯のばらつきを吸収して、放電灯の光出力をオーバ
ーシュートもアンダーシュートも無く立ち上げる事を可
能にする。しかしながら、放電灯電圧の発光効率の変極
点を知る為には、放電灯の近傍に光センサを取り付ける
必要がありコストがかさむという問題点がある。そこ
で、放電灯電圧の変化率より発光効率の変極点を推定
し、投入電力を切り換える方法が考えられる。図１３・
１４は、ある放電灯の発光効率、コールドスタート時の
放電灯電圧の立ち上がり、放電灯電圧の上昇率を表した
図である。発光効率の変極点ＶE は放電灯のばらつき、
経年変化によりまちまちであるが、放電灯電圧の上昇率
と発光効率の変極点の関係は放電灯のばらつき、経年変
化に関係なく、どの放電灯も放電灯電圧の上昇率がある
値ΔＶD以下になる所が、発光効率の変極点と一致す
る。すなわち、放電灯電圧が所定値ΔＶD 以上の値で上
昇している間は、放電灯電圧に応じて定格電力よりも大
きい電力を目標電力とし、放電灯の光の立ち上げを速く
し、上昇率が所定値以下になってからは、所定時間毎に
供給電力を減少させ定格電力点灯に移行する。また、放
電灯がホトスタートの時は、放電灯内部の金属がまだガ
ス状態で残っている為、放電灯電圧は、安定時の電圧付
近から始まり（図１２）、この時の発光効率の特性は、
コールドスタート時よりも高くなる。すなわち、ホット
スタートの時とコールドスタートの時とで更に投入電力
を切り換える必要がある。つまり、点灯直後の放電灯電
圧が所定値以上であればホットスタート、所定値以下で
あればコールドスタートと判定し、また、前回定格点灯
時の放電灯電圧を記憶する手段を備えた放電灯点灯装置
であれば、点灯直後の放電灯電圧が前回定格点灯時の放
電灯電圧よりも所定値以上低い値であればコールドスタ
ート、所定値以内であれば、ホットスタートと判定し、
放電灯電圧の上昇率が所定値以上の場合の放電灯電圧に
応じた目標電力、及び、上昇率が所定値以下の場合の目
標電力減少速度を別設定する。Example 1. First, prior to the description of the first embodiment, the idea of the present invention will be described. As can be seen from FIGS.
The discharge lamp voltage gradually rises after lighting, and the luminous efficiency also rises as the discharge lamp voltage rises. Therefore, by estimating the discharge lamp luminous efficiency from the discharge lamp voltage and supplying electric power larger than the rating to the discharge lamp according to the discharge lamp luminous efficiency at each time, the luminous flux of the discharge lamp can be promptly changed to the rated value at the time of starting. Can reach. However, the discharge lamp voltage rise characteristics, the discharge lamp voltage-discharge lamp luminous efficiency characteristics, and the final value of the discharge lamp voltage differ due to variations in individual discharge lamps and aging of the discharge lamp. In particular, the fact that the luminous efficiency of a discharge lamp starts to rise sharply differs depending on the discharge lamp, which makes it difficult to start the light of the discharge lamp without overshoot or undershoot. For example, in FIG. 11, when the discharge lamp voltage is V A , the discharge lamp A reaches the luminous efficiency of 100%, so the input power may be the rated power, but at this time, the discharge lamp B and the discharge lamp C emit light. The efficiency is 60 before the inflection point.
%, And the input power equal to or more than the rated power / 0.6 is required. That is, detecting the inflection point of the luminous efficiency of the discharge lamp and switching the input power before and after the inflection point,
It absorbs the variations of the discharge lamp and enables the light output of the discharge lamp to be started without overshoot or undershoot. However, in order to know the inflection point of the luminous efficiency of the discharge lamp voltage, it is necessary to attach an optical sensor in the vicinity of the discharge lamp, which causes a problem of cost increase. Therefore, a method of estimating the inflection point of the luminous efficiency from the rate of change of the discharge lamp voltage and switching the input power can be considered. Figure 13
14 is a diagram showing the luminous efficiency of a certain discharge lamp, the rise of the discharge lamp voltage at the cold start, and the rate of increase of the discharge lamp voltage. The inflection point V E of the luminous efficiency is the variation of the discharge lamp,
Although it varies depending on the changes over time, the relationship between the rate of increase in discharge lamp voltage and the inflection point of luminous efficiency is less than the value ΔV D at which discharge lamp voltage increases for all discharge lamps, regardless of variations in discharge lamps and changes over time. The point where is coincides with the inflection point of the luminous efficiency. That is, while the discharge lamp voltage is rising at a value equal to or higher than the predetermined value ΔV D , the target power is set to a power larger than the rated power according to the discharge lamp voltage, and the light of the discharge lamp rises faster and rises. After the rate becomes equal to or lower than the predetermined value, the supplied power is reduced at every predetermined time and the rated power lighting is started. Further, when the discharge lamp is photo-started, the metal inside the discharge lamp still remains in a gas state, so the discharge lamp voltage starts near the voltage at the stable time (Fig. 12), and the characteristics of the luminous efficiency at this time. Is
Higher than at cold start. That is, it is necessary to further switch the applied power between the hot start and the cold start. In other words, if the discharge lamp voltage immediately after lighting is higher than a predetermined value, it is judged as hot start, if it is lower than the predetermined value, it is judged as cold start, and the discharge lamp lighting is equipped with a means for storing the discharge lamp voltage at the last rated lighting. If it is a device, if the discharge lamp voltage immediately after lighting is lower than the discharge lamp voltage at the last rated lighting by a predetermined value or more, cold start, and if it is within a predetermined value, it is determined as hot start,
The target power corresponding to the discharge lamp voltage when the increase rate of the discharge lamp voltage is equal to or higher than a predetermined value, and the target power decrease rate when the increase rate is equal to or lower than the predetermined value are separately set.
【００１５】図１はこの発明による実施例１による放電
灯点灯装置の全体構成図である。８は電力供給源となる
直流電源、１０はこの直流電源８を入／切するスイッ
チ、７は直流電源８から供給される直流電圧を昇圧する
昇圧回路、３は上記直流電力を交流電力に変換する電力
供給手段であるインバータ回路、４はチョークコイルと
コンデンサからなるＬC 共振回路、５は放電灯である。
６は変流器９により検出された放電灯電流ＩL と放電灯
電圧ＶL を入力とし、インバータ回路３を制御する制御
回路である。FIG. 1 is an overall configuration diagram of a discharge lamp lighting device according to a first embodiment of the present invention. Reference numeral 8 is a DC power source serving as a power supply source, 10 is a switch for turning on / off the DC power source 8, 7 is a booster circuit for boosting a DC voltage supplied from the DC power source 8, and 3 is the above DC power converted to AC power. the inverter circuit is a power supply unit that, 4 L C resonant circuit composed of a choke coil and a capacitor, and 5 denotes a discharge lamp.
Reference numeral 6 denotes a control circuit which receives the discharge lamp current I L and the discharge lamp voltage V L detected by the current transformer 9 and controls the inverter circuit 3.
【００１６】次に図２〜５のフローチャート図及び図６
・７のテーブル図を用いて動作を説明する。図２〜５に
おいて、Ｓ１にて放電灯ＳＷ１０がＯＮであれば、Ｓ２
〜Ｓ４でインバータ動作周波数をＬＣ共振回路の共振周
波数ｆ0 にして、放電灯５に高圧を印加する。放電灯５
の電圧が所定電圧ＶA 以下になれば、放電灯５が絶縁破
壊して点灯したとみなして、次の動作を行う。Ｓ５で点
灯直後の放電灯電圧ＶINT を読み込み、Ｓ６で図５のタ
イマー割り込み内で演算される放電灯電圧変化率ΔＶと
ΔＶの演算に必要となる今回測定の放電灯電圧ＶL 、前
回測定の放電灯電圧ＶOLD の初期値設定を行う。ΔＶと
ＶL にはＶINT 、ＶOLD には零を初期値として設定す
る。Ｓ７〜Ｓ９では、ＶINT が所定値ＶB 以上であれ
ば、コールドスタート／ホットスタート判定フラグＦVL
に１をセット、ＶB 以下であれば、ＦVLに０をセットす
る。これにより、放電灯電圧が高い値から始まるホット
スタート時には、判定フラグＦVLに１がセットされ、放
電灯電圧が低い値から始まるコールドスタート時には、
判定フラグＦVLに０がセットされる。Next, the flow charts of FIGS. 2 to 5 and FIG.
The operation will be described with reference to the table diagram of 7. 2 to 5, if the discharge lamp SW10 is ON in S1, S2
At S4, the inverter operating frequency is set to the resonance frequency f 0 of the LC resonance circuit, and high voltage is applied to the discharge lamp 5. Discharge lamp 5
If the voltage of 1 is equal to or lower than the predetermined voltage V A , it is considered that the discharge lamp 5 has been dielectrically broken and turned on, and the next operation is performed. S5 reads the discharge lamp voltage V INT immediately lit, S6 in the discharge lamp voltage V L must become measured this time in the calculation of the discharge lamp voltage change rate ΔV and ΔV which is calculated by the timer interrupt of Figure 5, the previous measurement The initial value of the discharge lamp voltage V OLD is set. V INT is set to ΔV and VL , and zero is set to V OLD as initial values. In S7 to S9, if V INT is not less than the predetermined value V B , cold start / hot start determination flag F VL
Is set to 1, and if V B or less, 0 is set to F VL . As a result, the determination flag F VL is set to 1 at the hot start when the discharge lamp voltage starts from a high value, and at the cold start when the discharge lamp voltage starts from a low value.
The determination flag F VL is set to 0.
【００１７】ここで、放電灯点灯装置が前回の定格電力
点灯時の放電灯電圧ＶSTを記憶する手段を備えていれ
ば、コールドスタート／ホットスタート判定電圧は、所
定値ＶB ではなく、ＶST−ΔＶC としても良い（ΔＶC
は所定電圧偏差）。If the discharge lamp lighting device is provided with a means for storing the discharge lamp voltage V ST at the time of the last rated power lighting, the cold start / hot start determination voltage is not the predetermined value V B but V may be as ST -ΔV C (ΔV C
Is a predetermined voltage deviation).
【００１８】Ｓ１０で図５のタイマー割り込み処理が許
可され、これ以降、放電灯ＳＷ１０がＯＦＦされるまで
所定時間毎にこの処理が中断され図５の処理が実効され
る。Ｓ１１で放電灯上昇率ΔＶが所定値ΔＶD で以上で
あれば、放電灯電圧に応じて目標電力ＰOBJ を決定する
が、コールドスタート／ホットスタート判定フラグＦVL
により、コールドスタートであればＶL −ＰC のテーブ
ル（図６）、ホットスタートであればＶL −ＰH テーブ
ル（図６）を検索する分ける（Ｓ１３〜Ｓ１６）。ま
た、Ｓ１１で放電灯上昇率ΔＶが所定値ΔＶD で以下
で、かつ、図５にてカウントダウンされるタイマーＴが
０であれば、目標電力ＰOBJ を所定値ΔＰOBJ だけ下
げ、新たな目標電力とする（Ｓ１７〜Ｓ１８）。但し、
目標電力ＰOBJが放電灯の定格電圧ＰST以下にならない
ようにクリップする（Ｓ１９〜Ｓ２０）。Ｓ２１〜Ｓ２
３で、コールドスタートであれば、タイマーＴに所定値
ＴC 、コールドスタートであれば、タイマーＴに所定値
ＴH をセットする。Ｓ２４〜Ｓ２６で、供給電力ＰOBJ
と現在の電力ＰL との偏差ΔＰを求める。ΔＰがゼロで
なければ、ΔＰに応じて周波数補正量ｆp を決定する
（図７）。Ｓ２７〜Ｓ２９で、供給電力よりも現行電力
が少ない場合は、周波数をｆp だけ下げてやり電力を増
加させる。その逆の場合は、周波数をｆp だけ上げてや
り電力を減少させる。図５のＳ３０〜Ｓ３２では、タイ
マーＴのカウントダウンを行う。但し、タイマーＴは０
以下にならないようにクリップされる。Ｓ３３〜Ｓ３４
で放電灯電圧ＶL 、放電灯電流ＩL を読み込み、放電灯
電力ＰL を演算する。Ｓ３５では、今回測定時の放電灯
電圧ＶL と前回測定時の放電灯電圧ＶOLD より、放電灯
電圧の上昇率ΔＶを演算する。Ｓ３６で次回ΔＶの演算
の為に、ＶOLD にＶL を代入して図５の処理を終了す
る。The timer interrupt process of FIG. 5 is permitted in S10, and thereafter, this process is interrupted at predetermined time intervals until the discharge lamp SW10 is turned off, and the process of FIG. 5 is executed. If the discharge lamp increase rate ΔV is not less than the predetermined value ΔV D in S11, the target power P OBJ is determined according to the discharge lamp voltage, but the cold start / hot start determination flag F VL is set.
Thus, the table of VL- P C (FIG. 6) is searched for a cold start, and the table of VL- P H (FIG. 6) is searched for a hot start (S13 to S16). Further, if the discharge lamp increase rate ΔV is equal to or less than the predetermined value ΔV D in S11 and the timer T counted down in FIG. 5 is 0, the target power P OBJ is decreased by the predetermined value ΔP OBJ to obtain a new target. The power is used (S17 to S18). However,
The target power P OBJ is clipped so that it does not fall below the rated voltage P ST of the discharge lamp (S19 to S20). S21-S2
At 3, if the cold start is performed, the timer T is set to a predetermined value T C , and if the cold start is performed, the timer T is set to the predetermined value T H. Supply power P OBJ in S24 to S26
The deviation ΔP between the current power P L and the current power P L is calculated. If ΔP is not zero, the frequency correction amount f p is determined according to ΔP (FIG. 7). In S27 to S29, when the current power is less than the supplied power, the frequency is decreased by f p and the power is increased. In the opposite case, the frequency is increased by f p and the power is reduced. In S30 to S32 of FIG. 5, the timer T is counted down. However, the timer T is 0
Clipped so that it does not become the following. S33 to S34
The discharge lamp voltage V L and the discharge lamp current I L are read in to calculate the discharge lamp power P L. In S35, the rate of increase ΔV of the discharge lamp voltage is calculated from the discharge lamp voltage VL at the current measurement and the discharge lamp voltage V OLD at the previous measurement. In S36, V L is substituted for V OLD for the next calculation of ΔV, and the process of FIG. 5 is terminated.
【００１９】実施例２．実施例１では、放電灯の供給電
力を変える方法として、インバータ周波数を変える手段
を用いているが、ＤＣ−ＤＣコンバータの出力電圧を変
える手段を用いても同様の効果が望める。Example 2. In the first embodiment, a means for changing the inverter frequency is used as a method for changing the power supplied to the discharge lamp, but the same effect can be expected by using means for changing the output voltage of the DC-DC converter.
【００２０】[0020]
【発明の効果】請求項１の放電灯点灯装置は、ヨウ化物
系の金属ハロゲン化合物を封入した高圧放電灯と、この
高圧放電灯に電力を供給する電力供給装置と、前記高圧
放電灯の放電灯電圧及び電流を検出する手段と、前記高
圧放電灯の電力が目標電力となるよう前記電力供給装置
の出力電圧または出力電流を変える手段とを備えた放電
灯点灯装置において、前記放電灯電圧の上昇率を検出す
る手段と、前記放電灯電圧の上昇率が所定値以上の間
は、前記目標電力を前記高圧放電灯の定格電力より大き
くし、前記上昇率が所定値以下になってからは、前記高
圧放電灯への供給電力を減少させ前記定格電力点灯に移
行する手段とを具備した構成にしたので、放電灯のばら
つき、経年変化、始動状態による特性差を吸収でき、始
動時に放電灯の光がオーバーシュートもアンダーシュー
トもなく、光を早く定格値にできる。According to the discharge lamp lighting device of the first aspect of the present invention, a high pressure discharge lamp in which an iodide metal halide compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge of the high pressure discharge lamp are provided. In a discharge lamp lighting device comprising means for detecting a lamp voltage and current, and means for changing the output voltage or output current of the power supply device so that the power of the high-pressure discharge lamp becomes a target power, the discharge lamp voltage Between the means for detecting the rate of rise and the rate of rise of the discharge lamp voltage is above a predetermined value, the target power is made larger than the rated power of the high pressure discharge lamp, and after the rate of rise falls below a predetermined value. Since it is configured to reduce the power supplied to the high-pressure discharge lamp and shift to the rated power lighting, it is possible to absorb variations in the discharge lamp, aging, and characteristic differences due to the starting state, and the discharge lamp at the time of starting. The light of Over bar shoot even undershoot without any, can be early rated value of the light.
【００２１】請求項２の放電灯点灯装置は、ヨウ化物系
の金属ハロゲン化合物を封入した高圧放電灯と、この高
圧放電灯に電力を供給する電力供給装置と、前記高圧放
電灯の放電灯電圧及び電流を検出する手段と、前記高圧
放電灯の電力が目標電力となるよう前記電力供給装置の
出力電圧または出力電流を変える手段とを備えた放電灯
点灯装置において、前記高圧放電灯が消灯後十分な時間
が経過して低い温度状態での点灯時（コールドスター
ト）と、前記高圧放電灯自体の温度が高い状態での再点
灯時（ホットスタート）とで、前記放電灯電圧の上昇率
が所定値以上の場合の前記目標電力、及び前記放電灯電
圧の上昇率が所定値以下の場合の前記目標電力減少速度
を別設定する手段とを具備した構成にしたので、ホット
スタート時とコールドスタート時とで、夫々に適した投
入電力を設定できる。A discharge lamp lighting device according to a second aspect of the present invention is a high pressure discharge lamp in which an iodide metal halogen compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge lamp voltage of the high pressure discharge lamp. And a means for detecting a current, and a means for changing the output voltage or the output current of the power supply device so that the power of the high-pressure discharge lamp becomes a target power, in the discharge lamp lighting device, after the high-pressure discharge lamp is turned off After a sufficient time has passed, the discharge lamp voltage increases at a low temperature state (cold start) and at a high temperature of the high pressure discharge lamp itself (hot start). Since the target power in the case of a predetermined value or more and the target power decrease rate in the case where the rate of increase of the discharge lamp voltage is a predetermined value or less are separately set, it is called at the time of hot start. In the at the start, you can set the input power suitable for each.
【００２２】請求項３の放電灯点灯装置は、ヨウ化物系
の金属ハロゲン化合物を封入した高圧放電灯と、この高
圧放電灯に電力を供給する電力供給装置と、前記高圧放
電灯の放電灯電圧及び電流を検出する手段と、前記高圧
放電灯の電力が目標電力となるよう前記電力供給装置の
出力電圧または出力電流を変える手段とを備えた放電灯
点灯装置において、前記高圧放電灯の点灯直後の前記放
電灯電圧が所定値以上であれば、前記高圧放電灯自体の
温度が高い状態での再点灯時（ホットスタート）、所定
値以下であれば、前記高圧放電灯が消灯後十分な時間が
経過して低い温度状態での点灯時（コールドスタート）
と判定する手段とを具備した構成にしたので、温度検出
装置等を用いずに、安価にホットスタートとコールドス
タートの判定ができる。A discharge lamp lighting device according to a third aspect of the present invention is a high pressure discharge lamp in which an iodide metal halide compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge lamp voltage of the high pressure discharge lamp. And a means for detecting a current, and means for changing the output voltage or output current of the power supply device so that the power of the high pressure discharge lamp becomes a target power, in the discharge lamp lighting device, immediately after lighting of the high pressure discharge lamp If the discharge lamp voltage is equal to or higher than a predetermined value, the high pressure discharge lamp itself is re-lit when the temperature is high (hot start), and if the voltage is equal to or lower than a predetermined value, the high pressure discharge lamp has sufficient time after being turned off. When the lamp lights up in a low temperature state after a lapse of time (cold start)
Since it is configured to include means for determining that the hot start and the cold start can be inexpensively performed without using a temperature detection device or the like.
【００２３】請求項４の放電灯点灯装置は、ヨウ化物系
の金属ハロゲン化合物を封入した高圧放電灯と、この高
圧放電灯に電力を供給する電力供給装置と、前記高圧放
電灯の放電灯電圧及び電流を検出する手段と、前記高圧
放電灯の電力が目標電力となるよう前記電力供給装置の
出力電圧または出力電流を変える手段とを備えた放電灯
点灯装置において、前回定格点灯時の前記放電灯電圧を
記憶する手段と、前記高圧放電灯の点灯直後の前記放電
灯電圧が、前記前回定格点灯時の前記放電灯電圧よりも
所定値以上低い値であれば、前記高圧放電灯が消灯後十
分な時間が経過して低い温度状態での点灯時（コールド
スタート）、所定値以内であれば、前記高圧放電灯自体
の温度が高い状態での再点灯時（ホットスタート）と判
定する手段とを具備した構成にしたので、温度検出装置
等を用いずに、安価にホットスタートとコールドスター
トの判定ができる。A discharge lamp lighting device according to a fourth aspect of the present invention is a high pressure discharge lamp in which an iodide metal halogen compound is sealed, a power supply device for supplying electric power to the high pressure discharge lamp, and a discharge lamp voltage of the high pressure discharge lamp. And a means for detecting current, and means for changing the output voltage or output current of the power supply device so that the power of the high-pressure discharge lamp becomes the target power, in the discharge lamp lighting device, the discharge at the last rated lighting. A means for storing an electric lamp voltage, and the discharge lamp voltage immediately after lighting of the high pressure discharge lamp is a value lower than the discharge lamp voltage at the time of the previous rated lighting by a predetermined value or more, after the high pressure discharge lamp is turned off. When a sufficient time has passed and the lamp is lit in a low temperature state (cold start) and within a predetermined value, a means for determining that the high pressure discharge lamp itself is relighted in a high temperature state (hot start) The ingredients Having to the configuration, without using a temperature detection device or the like, it is determined inexpensively hot start and cold start.
【図１】この発明の実施例１による放電灯点灯装置の全
体構成図である。FIG. 1 is an overall configuration diagram of a discharge lamp lighting device according to a first embodiment of the present invention.
【図２】この発明の実施例１による放電灯点灯装置のフ
ローチャート図である。FIG. 2 is a flowchart of the discharge lamp lighting device according to the first embodiment of the present invention.
【図３】この発明の実施例１による放電灯点灯装置のフ
ローチャート図である。FIG. 3 is a flowchart of the discharge lamp lighting device according to the first embodiment of the present invention.
【図４】この発明の実施例１による放電灯点灯装置のフ
ローチャート図である。FIG. 4 is a flowchart of the discharge lamp lighting device according to the first embodiment of the present invention.
【図５】この発明の実施例１による放電灯点灯装置のフ
ローチャート図である。FIG. 5 is a flowchart of the discharge lamp lighting device according to the first embodiment of the present invention.
【図６】この発明の実施例１による放電灯点灯装置のテ
ーブル図である。FIG. 6 is a table diagram of the discharge lamp lighting device according to the first embodiment of the present invention.
【図７】この発明の実施例１による放電灯点灯装置のテ
ーブル図である。FIG. 7 is a table diagram of the discharge lamp lighting device according to the first embodiment of the present invention.
【図８】従来の放電灯点灯装置の全体構成図である。FIG. 8 is an overall configuration diagram of a conventional discharge lamp lighting device.
【図９】従来の放電灯点灯装置のフローチャート図であ
る。FIG. 9 is a flowchart of a conventional discharge lamp lighting device.
【図１０】放電灯点灯装置の放電灯電圧特性図である。FIG. 10 is a discharge lamp voltage characteristic diagram of the discharge lamp lighting device.
【図１１】放電灯点灯装置の放電灯電圧−放電灯発光効
率特性図である。FIG. 11 is a discharge lamp voltage-discharge lamp luminous efficiency characteristic diagram of the discharge lamp lighting device.
【図１２】放電灯点灯装置の放電灯電圧特性図である。FIG. 12 is a discharge lamp voltage characteristic diagram of the discharge lamp lighting device.
【図１３】放電灯点灯装置の放電灯電圧−放電灯発光効
率特性図である。FIG. 13 is a discharge lamp voltage-discharge lamp luminous efficiency characteristic diagram of the discharge lamp lighting device.
【図１４】放電灯点灯装置の放電灯電圧、放電灯電圧変
化率特性図である。FIG. 14 is a characteristic diagram of a discharge lamp voltage and a discharge lamp voltage change rate of the discharge lamp lighting device.
１ 交流電源 ２ 整流回路 ３ インバータ回路 ４ ＬＣ共振回路 ５ 放電灯 ６ 制御手段 ７ 昇圧回路 ８ 直流電源 ９ 変流器 １０ スイッチ 1 AC power supply 2 Rectifier circuit 3 Inverter circuit 4 LC resonance circuit 5 Discharge lamp 6 Control means 7 Booster circuit 8 DC power supply 9 Current transformer 10 Switch
フロントページの続き (72)発明者 永井 敏 鎌倉市大船二丁目14番40号 三菱電機株式 会社生活システム研究所内Front Page Continuation (72) Inventor Toshi Nagai 2-14-40 Ofuna, Kamakura City Mitsubishi Electric Corporation Life Systems Research Center
Claims (4)
した高圧放電灯と、この高圧放電灯に電力を供給する電
力供給装置と、前記高圧放電灯の放電灯電圧及び電流を
検出する手段と、前記高圧放電灯の電力が目標電力とな
るよう前記電力供給装置の出力電圧または出力電流を変
える手段とを備えた放電灯点灯装置において、前記放電
灯電圧の上昇率を検出する手段と、前記放電灯電圧の上
昇率が所定値以上の間は、前記目標電力を前記高圧放電
灯の定格電力より大きくし、前記上昇率が所定値以下に
なってからは、前記高圧放電灯への供給電力を減少させ
前記定格電力点灯に移行する手段とを具備した放電灯点
灯装置。1. A high-pressure discharge lamp in which an iodide-based metal halogen compound is sealed, a power supply device for supplying electric power to the high-pressure discharge lamp, and means for detecting discharge lamp voltage and current of the high-pressure discharge lamp. In a discharge lamp lighting device comprising: a means for changing an output voltage or an output current of the power supply device so that the power of the high pressure discharge lamp becomes a target power, a means for detecting a rate of increase of the discharge lamp voltage, While the rate of increase of the lamp voltage is a predetermined value or more, the target power is made larger than the rated power of the high-pressure discharge lamp, and after the rate of increase becomes a predetermined value or less, the power supplied to the high-pressure discharge lamp is reduced. A discharge lamp lighting device, comprising: a means for decreasing the power consumption to the rated power lighting.
した高圧放電灯と、この高圧放電灯に電力を供給する電
力供給装置と、前記高圧放電灯の放電灯電圧及び電流を
検出する手段と、前記高圧放電灯の電力が目標電力とな
るよう前記電力供給装置の出力電圧または出力電流を変
える手段とを備えた放電灯点灯装置において、前記高圧
放電灯が消灯後十分な時間が経過して低い温度状態での
点灯時（コールドスタート）と、前記高圧放電灯自体の
温度が高い状態での再点灯時（ホットスタート）とで、
前記放電灯電圧の上昇率が所定値以上の場合の前記目標
電力、及び前記放電灯電圧の上昇率が所定値以下の場合
の前記目標電力減少速度を別設定する手段とを具備した
放電灯点灯装置。2. A high-pressure discharge lamp in which an iodide-based metal halogen compound is sealed, a power supply device for supplying electric power to the high-pressure discharge lamp, and means for detecting the discharge lamp voltage and current of the high-pressure discharge lamp. In a discharge lamp lighting device having means for changing an output voltage or an output current of the power supply device so that the power of the high pressure discharge lamp becomes a target power, the high pressure discharge lamp is low after a sufficient time has passed after being turned off. At the time of lighting in the temperature state (cold start) and at the time of relighting when the temperature of the high pressure discharge lamp itself is high (hot start),
Discharge lamp lighting comprising means for separately setting the target power when the rate of increase of the discharge lamp voltage is a predetermined value or more and the target power decrease rate when the rate of increase of the discharge lamp voltage is a predetermined value or less apparatus.
した高圧放電灯と、この高圧放電灯に電力を供給する電
力供給装置と、前記高圧放電灯の放電灯電圧及び電流を
検出する手段と、前記高圧放電灯の電力が目標電力とな
るよう前記電力供給装置の出力電圧または出力電流を変
える手段とを備えた放電灯点灯装置において、前記高圧
放電灯の点灯直後の前記放電灯電圧が所定値以上であれ
ば、前記高圧放電灯自体の温度が高い状態での再点灯時
（ホットスタート）、所定値以下であれば、前記高圧放
電灯が消灯後十分な時間が経過して低い温度状態での点
灯時（コールドスタート）と判定する手段とを具備した
放電灯点灯装置。3. A high-pressure discharge lamp in which an iodide-based metal halogen compound is sealed, a power supply device for supplying electric power to the high-pressure discharge lamp, and means for detecting a discharge lamp voltage and current of the high-pressure discharge lamp. In a discharge lamp lighting device comprising means for changing the output voltage or output current of the power supply device so that the power of the high pressure discharge lamp becomes a target power, the discharge lamp voltage immediately after lighting of the high pressure discharge lamp is a predetermined value. If it is above, at the time of relighting in a high temperature state of the high pressure discharge lamp itself (hot start), if it is below a predetermined value, in a low temperature state after a sufficient time has passed after the high pressure discharge lamp is turned off. A discharge lamp lighting device comprising means for determining when the lamp is lit (cold start).
した高圧放電灯と、この高圧放電灯に電力を供給する電
力供給装置と、前記高圧放電灯の放電灯電圧及び電流を
検出する手段と、前記高圧放電灯の電力が目標電力とな
るよう前記電力供給装置の出力電圧または出力電流を変
える手段とを備えた放電灯点灯装置において、前回定格
点灯時の前記放電灯電圧を記憶する手段と、前記高圧放
電灯の点灯直後の前記放電灯電圧が、前記前回定格点灯
時の前記放電灯電圧よりも所定値以上低い値であれば、
前記高圧放電灯が消灯後十分な時間が経過して低い温度
状態での点灯時（コールドスタート）、所定値以内であ
れば、前記高圧放電灯自体の温度が高い状態での再点灯
時（ホットスタート）と判定する手段とを具備した放電
灯点灯装置。4. A high-pressure discharge lamp in which an iodide-based metal halogen compound is sealed, a power supply device for supplying electric power to the high-pressure discharge lamp, and means for detecting a discharge lamp voltage and current of the high-pressure discharge lamp. In a discharge lamp lighting device having means for changing the output voltage or output current of the power supply device so that the power of the high-pressure discharge lamp becomes a target power, a means for storing the discharge lamp voltage at the last rated lighting, The discharge lamp voltage immediately after lighting of the high-pressure discharge lamp is a value that is lower than the discharge lamp voltage at the last rated lighting by a predetermined value or more,
When the high-pressure discharge lamp is lit in a low temperature state for a sufficient time after it has been turned off (cold start), if it is within a predetermined value, when the high-pressure discharge lamp itself is re-lit in a high temperature state (hot A discharge lamp lighting device comprising means for determining (start).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19976192A JP3247432B2 (en) | 1992-07-27 | 1992-07-27 | Discharge lamp lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19976192A JP3247432B2 (en) | 1992-07-27 | 1992-07-27 | Discharge lamp lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0645081A true JPH0645081A (en) | 1994-02-18 |
| JP3247432B2 JP3247432B2 (en) | 2002-01-15 |
Family
ID=16413186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19976192A Expired - Lifetime JP3247432B2 (en) | 1992-07-27 | 1992-07-27 | Discharge lamp lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3247432B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004006632A1 (en) * | 2002-07-02 | 2004-01-15 | Mitsubishi Denki Kabushiki Kaisha | Discharge lamp lighting device |
| DE10392169B4 (en) * | 2002-09-25 | 2010-06-10 | Panasonic Electric Works Co., Ltd., Kadoma-shi | Electronic ballast for a discharge lamp |
-
1992
- 1992-07-27 JP JP19976192A patent/JP3247432B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004006632A1 (en) * | 2002-07-02 | 2004-01-15 | Mitsubishi Denki Kabushiki Kaisha | Discharge lamp lighting device |
| US7091673B2 (en) | 2002-07-02 | 2006-08-15 | Mitsubishi Denki Kabushiki Kaisha | Discharge lamp lighting device |
| DE10392144B4 (en) * | 2002-07-02 | 2010-06-10 | Mitsubishi Denki K.K. | Electronic ballast for discharge lamps |
| DE10392169B4 (en) * | 2002-09-25 | 2010-06-10 | Panasonic Electric Works Co., Ltd., Kadoma-shi | Electronic ballast for a discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3247432B2 (en) | 2002-01-15 |
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