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JPH06111987A - Electric discharge lamp lighting device - Google Patents

Electric discharge lamp lighting device

Info

Publication number
JPH06111987A
JPH06111987A JP4254848A JP25484892A JPH06111987A JP H06111987 A JPH06111987 A JP H06111987A JP 4254848 A JP4254848 A JP 4254848A JP 25484892 A JP25484892 A JP 25484892A JP H06111987 A JPH06111987 A JP H06111987A
Authority
JP
Japan
Prior art keywords
current
discharge lamp
power supply
voltage
supply 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.)
Pending
Application number
JP4254848A
Other languages
Japanese (ja)
Inventor
Nobuyuki Yamada
田 信 幸 山
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.)
Toto Ltd
Original Assignee
Toto 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 Toto Ltd filed Critical Toto Ltd
Priority to JP4254848A priority Critical patent/JPH06111987A/en
Publication of JPH06111987A publication Critical patent/JPH06111987A/en
Pending legal-status Critical Current

Links

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

PURPOSE:To provide an electric discharge lamp lighting device by which stable light dimming can be carried out over a wide range. CONSTITUTION:An inverter 10 converts a direct current into an alternating current, and supplies it to an electric discharge lamp 18. An electric current detecting means 20 detects an input electric current of the inverter 10. A brightness adjuster 24 sets brightness of the electric discharge lamp, and outputs an electric current command corresponding to this. The first DC electric power supply device 4 turns on and off a constant voltage direct current, and smoothes the rectangular wave voltage, and adds it to the inverter 10, and changes at least one of on-and-off times so that the electric current command of the brightness adjuster 24 and a detected value of the electric current detecting means 20 can coincide with each other. The second DC electric power supply device 6 outputs a direct current corresponding to the electric current command. A voltage detecting means 22 detects the voltage across the electric discharge lamp 18, and a mode switching signal generator 28 generates a mode switching signal when a detected value of the voltage detecting means 22 is not less than a prescribed value. Switching means 8 and 26 operate the DC electric power supply device 6 while the mode switching signal generator 28 is generating the mode switching signal.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、メタルハライドランプ
等の放電灯を点灯及び調光する放電灯点灯装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for lighting and dimming a discharge lamp such as a metal halide lamp.

【0002】[0002]

【従来の技術】放電灯を点灯及び調光する従来装置とし
て、例えば、特開平2-197093号公報に開示された放電灯
点灯装置がある。この放電灯点灯装置は、商用の交流電
源からの交流を整流器により直流に変換し、この直流を
フルブリッジ形のインバータ回路に送って、該インバー
タ回路のゲート端子に、交流制御信号を加えることによ
り、直流から交流の矩形波を形成し、この矩形波で放電
灯を点灯するように構成されている。
2. Description of the Related Art As a conventional device for lighting and dimming a discharge lamp, for example, there is a discharge lamp lighting device disclosed in Japanese Patent Laid-Open No. 2-197093. This discharge lamp lighting device converts alternating current from a commercial alternating current power source into direct current by a rectifier, sends this direct current to a full bridge type inverter circuit, and adds an alternating current control signal to a gate terminal of the inverter circuit. The direct current is formed from an alternating current rectangular wave, and the discharge lamp is lit by the rectangular wave.

【0003】そして、放電灯点灯装置には、調光装置と
して、インバータ回路のゲート端子に交流制御信号を与
える制御回路を備えている。すなわち、制御回路は、イ
ンバータ回路のオンオフ動作中に、減光量に応じたオフ
時間を重畳させて、実質的に周波数制御を行うことによ
り調光を行っている。
Further, the discharge lamp lighting device is provided with a control circuit as a light control device for giving an AC control signal to the gate terminal of the inverter circuit. That is, the control circuit performs the dimming by superposing the OFF time according to the dimming amount and substantially controlling the frequency during the ON / OFF operation of the inverter circuit.

【0004】[0004]

【発明が解決しようとする課題】しかし、上記調光装置
では、周波数制御を行っているので、放電灯への電力調
節により減光する際に、放電灯に電力が供給されないオ
フ期間が長くなってしまい、この間に消灯しやすかっ
た。すなわち、上記調光装置では、減光する調光を安定
して行うことができず、よって、調光範囲が非常に狭い
という問題があった。
However, since the above-mentioned light control device controls the frequency, when the light is dimmed by adjusting the power to the discharge lamp, the off period in which the power is not supplied to the discharge lamp becomes long. It was easy to turn off during this time. That is, the above-mentioned light control device has a problem that the light control for dimming cannot be stably performed, and thus the light control range is very narrow.

【0005】本発明は、上記の問題点を解決するために
なされたもので、放電灯への供給電力を小さくするよう
な調光を行っても、消灯することなく、安定した調光を
広い範囲で行うことの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 even if dimming is performed so as to reduce the electric power supplied to the discharge lamp, the dimming is not turned off and stable dimming is wide. An object is to obtain a discharge lamp lighting device that can be operated in a range.

【0006】[0006]

【課題を解決するための手段】本発明は、直流を所定周
波数の交流に変換して放電灯に供給する直流交流変換手
段と、この直流交流変換手段の入力電流を検出する電流
検出手段と、放電灯の輝度を設定することにより、この
輝度に対応した電流指令を出力する輝度調節手段と、定
電圧の直流をオンオフし、得られた矩形波電圧を平滑し
て直流交流変換手段に加えると共に、輝度調節手段の電
流指令と電流検出手段の電流検出値とが一致するよう
に、オフ時間及びオン時間の少なくとも一方を変化させ
る第1の直流電源装置と、電流指令に対応した直流電流
を出力する第2の直流電源装置と、放電灯の両端電圧を
検出する電圧検出手段と、この電圧検出手段の電圧検出
値が所定値以下である間、モード切替信号を発生するモ
ード切替信号発生手段と、このモード切替信号発生手段
がモード切替信号を発生している間、第2の直流電源装
置を作動させると共に、この第2の直流電源装置の出力
を第1の直流電源装置の代わりに直流交流変換手段に加
える切替手段とを備えたものである。
According to the present invention, there is provided a DC / AC converting means for converting a direct current into an alternating current having a predetermined frequency and supplying it to a discharge lamp, and a current detecting means for detecting an input current of the direct current / AC converting means. By setting the brightness of the discharge lamp, a brightness adjusting means for outputting a current command corresponding to this brightness, and turning on / off a constant voltage direct current, smoothing the obtained rectangular wave voltage, and adding it to the direct current / AC converting means. , A first DC power supply device that changes at least one of an off time and an on time so that the current command of the brightness adjusting means and the current detection value of the current detecting means match, and outputs a DC current corresponding to the current command. And a voltage detecting means for detecting the voltage across the discharge lamp, and a mode switching signal generating means for generating a mode switching signal while the voltage detection value of the voltage detecting means is below a predetermined value. While the mode switching signal generating means is generating the mode switching signal, the second DC power supply device is operated and the output of the second DC power supply device is changed to the direct current power supply device instead of the direct current power supply device. The switching means is provided in addition to the AC converting means.

【0007】[0007]

【作用】この発明においては、直流交流変換手段によっ
て直流を所定周波数の交流に変換して放電灯に供給する
と共に、直流交流変換手段の入力電流を制御しているの
で、立ち消えの原因となるような休止期間の重畳が行わ
れず、放電灯の輝度の低い範囲まで調光ができ、さら
に、放電灯の両端電圧が所定値以上である間、すなわ
ち、放電灯の輝度の低い範囲では、定電流形の直流電源
装置から電流を強制的に供給するようにしたので調光範
囲を一層広げることができる。
According to the present invention, since the direct current to the alternating current converting device converts the direct current into the alternating current of the predetermined frequency and supplies it to the discharge lamp, and the input current of the direct current to the alternating current converting device is controlled, it causes the extinction. It is possible to perform dimming to a range where the brightness of the discharge lamp is low without superimposing different idle periods.Furthermore, while the voltage across the discharge lamp is above a predetermined value, that is, in the range where the brightness of the discharge lamp is low, a constant current is maintained. Since the current is forcibly supplied from the DC power supply device of the shape, the dimming range can be further widened.

【0008】[0008]

【実施例】以下、本発明を図面に示す実施例によって詳
細に説明する。図1はこの発明の一実施例の構成を示す
ブロック図である。同図において、商用の交流電源2に
第1の直流電源装置4及び第2の直流電源装置6が接続
されている。このうち、第1の直流電源装置4は交流電
圧を整流して電圧一定の直流を作り、この直流を、いわ
ゆる、チョッパでオンオフして得られる矩形波電圧を平
滑して出力すると共に、これに加えられる電流指令と、
出力電流の検出値とが一致するようにチョッパのオフ時
間を変えるものである。また、第2の直流電源装置6は
交流電圧を整流して電圧が一定の直流を作り、これを直
流ー直流変換器に加えると共に、この直流ー直流変換器
を制御することによって、出力電流を電流指令に一致さ
せるものである。
The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, a first AC power supply device 4 and a second DC power supply device 6 are connected to a commercial AC power supply 2. Of these, the first DC power supply device 4 rectifies the AC voltage to generate a DC voltage having a constant voltage, smoothes a rectangular wave voltage obtained by turning on / off the so-called chopper, and outputs the DC voltage. The applied current command,
The off time of the chopper is changed so that the detected value of the output current matches. In addition, the second DC power supply device 6 rectifies the AC voltage to generate DC having a constant voltage, adds the DC to the DC-DC converter, and controls the DC-DC converter to output the output current. It matches the current command.

【0009】これら第1の直流電源装置4及び第2の直
流電源装置6の各出力は、電源切替回路8を介して、イ
ンバータ10に加えられる。電源切替回路8は通常時、第
1の直流電源装置4の出力をインバータ10に供給する一
方、第2の直流電源装置6の出力がインバータ10に加わ
らないようにし、モード切替信号が加えられている間、
第2の直流電源装置6の出力をインバータ10に供給する
一方、第1の直流電源装置4の出力がインバータ10に加
わらないようにするものである。
The outputs of the first DC power supply device 4 and the second DC power supply device 6 are applied to the inverter 10 via the power supply switching circuit 8. Normally, the power supply switching circuit 8 supplies the output of the first DC power supply device 4 to the inverter 10 while preventing the output of the second DC power supply device 6 from being applied to the inverter 10 and adding a mode switching signal. While
The output of the second DC power supply device 6 is supplied to the inverter 10, while the output of the first DC power supply device 4 is prevented from being applied to the inverter 10.

【0010】インバータ10はFET等を用いた4個のス
イッチング素子をフルブリッジ型に接続したものでな
り、インバータ制御回路12によって所定の2組のスイッ
チング素子対を交互にオンオフすることにより直流を50
Hz〜120Hz の矩形波交流に変換して放電灯18に供給する
ものである。
The inverter 10 is formed by connecting four switching elements, such as FETs, in a full-bridge type, and a direct current of 50 is generated by alternately turning on and off predetermined two pairs of switching elements by an inverter control circuit 12.
It is converted into a rectangular wave alternating current of Hz to 120 Hz and supplied to the discharge lamp 18.

【0011】また、放電灯18には点灯用のイグナイタ16
が接続されている。このイグナイタ16は、周知であるた
めその構成説明を省略するが、スイッチ操作によって高
電圧パルスを発生せしめて放電灯18を点灯させ、点灯後
は高電圧パルスの印加を停止するものである。なお、こ
の高電圧パルスからインバータ10を構成するスイッチン
グ素子を保護するべく、このインバータ10と放電灯18と
の間にコンデンサ14が接続されている。
Further, the discharge lamp 18 has an igniter 16 for lighting.
Are connected. Since the igniter 16 is well known, its structure will not be described. However, a high voltage pulse is generated by a switch operation to light the discharge lamp 18, and the application of the high voltage pulse is stopped after lighting. A capacitor 14 is connected between the inverter 10 and the discharge lamp 18 in order to protect the switching element forming the inverter 10 from the high voltage pulse.

【0012】そして、上述した放電灯点灯経路のうち、
電源切替回路8とインバータ10との間に電流検出器20が
設けられ、第1の直流電源装置4はその検出値をフィー
ドバック信号として電流値制御をする。また、放電灯18
の両端電圧を検出する電圧検出器22が設けられており、
その出力信号が後述するモード切替信号発生器28に加え
られている。
Of the above discharge lamp lighting paths,
A current detector 20 is provided between the power supply switching circuit 8 and the inverter 10, and the first DC power supply device 4 controls the current value by using the detected value as a feedback signal. Also, the discharge lamp 18
A voltage detector 22 for detecting the voltage across both ends of
The output signal is applied to the mode switching signal generator 28 described later.

【0013】一方、放電灯18の明るさを調節するための
輝度調節器24が設けられている。この輝度調節器24は、
例えば、調節つまみのようなものでなり、その角度を調
節することによって、輝度に対応した電流指令を出力す
る。この輝度調節器24の出力経路に電流指令切替回路26
が設けられ、通常時、電流指令を第1の直流電源装置4
に加え、これにモード切替信号が加えられている間、電
流指令を第2の直流電源装置6に切替入力するものであ
る。
On the other hand, a brightness adjuster 24 for adjusting the brightness of the discharge lamp 18 is provided. This brightness adjuster 24
For example, it is like an adjusting knob, and a current command corresponding to the brightness is output by adjusting the angle. A current command switching circuit 26 is provided in the output path of the brightness adjuster 24.
Is provided, and normally, the current command is sent to the first DC power supply device 4
In addition, the current command is switched to the second DC power supply device 6 while the mode switching signal is being applied thereto.

【0014】モード切替信号発生器28は電圧検出器22の
出力信号に基づき、放電灯18の両端電圧が所定値を超え
ている間、モード切替信号を発生して電源切替回路8及
び電流指令切替回路26に加えるものである。なお、放電
灯18の初期点灯時にはモード切替信号を発生しないよう
に、例えば、タイマ等を内蔵し、そのタイムアップ後に
上記の動作をするように構成されている。
The mode switching signal generator 28 generates a mode switching signal based on the output signal of the voltage detector 22 while the voltage across the discharge lamp 18 exceeds a predetermined value to switch the power source switching circuit 8 and the current command. In addition to the circuit 26. It should be noted that, for example, a timer is built in so that the mode switching signal is not generated when the discharge lamp 18 is initially lit, and the above operation is performed after the time is up.

【0015】上記のように構成された本実施例の動作を
以下に説明する。先ず、輝度調節器24によって放電灯18
の輝度を適宜設定する。このとき、モード切替信号発生
器28はモード切替信号を出力しない。すなわち、モード
切替信号発生器28の出力は「L」レベルに保持されてい
る。従って、電流指令切替回路26は輝度調節器24の電流
指令を第1の直流電源装置4に加え、電源切替回路8は
第1の直流電源装置4の出力をインバータ10に加えてい
る。
The operation of this embodiment configured as described above will be described below. First, the discharge lamp 18 is controlled by the brightness adjuster 24.
The brightness of is set appropriately. At this time, the mode switching signal generator 28 does not output the mode switching signal. That is, the output of the mode switching signal generator 28 is held at "L" level. Therefore, the current command switching circuit 26 applies the current command of the brightness adjuster 24 to the first DC power supply device 4, and the power supply switching circuit 8 applies the output of the first DC power supply device 4 to the inverter 10.

【0016】次に、イグナイタ16を操作して放電灯18を
初期点灯させると、放電灯18の内部インピーダンスが降
下し、インバータ10から出力される50Hz〜120Hz の矩形
波交流が放電灯18に供給され、これにより点灯状態を維
持する。このとき、第1の直流電源装置4は、交流電源
2の交流を倍電圧整流して得られた直流を、チョッパで
オンオフし、さらに、オンオフして得られた矩形波電圧
を平滑して出力すると共に、輝度調節器24から加えられ
た電流指令と電流検出器20によって検出された電流検出
値とが一致するように、オフ時間を調節する。よって、
輝度調節器24で設定した輝度が得られる。そして、この
状態で輝度調節器24の角度を変化させることにより輝度
の調節ができる。
Next, when the igniter 16 is operated to initially light the discharge lamp 18, the internal impedance of the discharge lamp 18 drops, and the rectangular wave alternating current of 50 Hz to 120 Hz output from the inverter 10 is supplied to the discharge lamp 18. As a result, the lighting state is maintained. At this time, the first direct-current power supply device 4 turns on and off the direct current obtained by rectifying the alternating current of the alternating-current power supply 2 by a chopper, and further smoothes the rectangular wave voltage obtained by turning on and off and outputs it. At the same time, the off time is adjusted so that the current command applied from the brightness adjuster 24 and the current detection value detected by the current detector 20 match. Therefore,
The brightness set by the brightness adjuster 24 can be obtained. Then, the brightness can be adjusted by changing the angle of the brightness adjuster 24 in this state.

【0017】ここで、第1の直流電源装置4の出力特性
と放電灯18の電圧電流特性との関係を図2を用いて説明
する。周知の如く、放電灯18の電圧と電流との間には図
2中に破線で示した関係がある。すなわち、電流値の大
きい範囲で電圧は略一定で、電流値が零に近付くに従っ
て電圧が急に増大する。この関係を放電灯の電圧電流曲
線Qという。一方、放電灯18の代わりに可変抵抗器を接
続すると共に、輝度調節器24によって最大の電流指令を
与えたまま可変抵抗器の抵抗値を種々に変化させた場
合、可変抵抗器の両端に発生する電圧とこれを流れる電
流との間に直線Aに示す関係がある。VMAX は交流電源
2の交流を整流して得られた直流電圧の最大値である。
また、輝度調節器24によって電流指令を段階的に減少さ
せ、それぞれについて電圧と電流との関係をプロットす
れば直線B,C,Dのようになる。従って、輝度調節器
24によって輝度調節をした場合、直線A,B,Cと放電
灯の電圧電流曲線Qとの交点a,b,cで平衡すること
が分かる。ここで、輝度調節器24によって輝度を小さく
設定したことにより、直線Dの特性が得られたとすれ
ば、この直線Dは放電灯の電圧電流曲線Qと交差しない
ので、当然のことながら放電灯18は失灯する。この結
果、第1の直流電源装置4によって、交点aから交点c
に示す範囲までの調光しかできないことが分かる。
Now, the relationship between the output characteristic of the first DC power supply device 4 and the voltage-current characteristic of the discharge lamp 18 will be described with reference to FIG. As is well known, the relationship between the voltage and the current of the discharge lamp 18 is shown by the broken line in FIG. That is, the voltage is substantially constant in the range where the current value is large, and the voltage suddenly increases as the current value approaches zero. This relationship is called the voltage-current curve Q of the discharge lamp. On the other hand, when a variable resistor is connected instead of the discharge lamp 18 and the resistance value of the variable resistor is changed variously while the maximum current command is given by the brightness adjuster 24, it occurs at both ends of the variable resistor. There is a relationship indicated by a straight line A between the applied voltage and the current flowing through it. V MAX is the maximum value of the DC voltage obtained by rectifying the AC of the AC power supply 2.
Further, the brightness controller 24 gradually decreases the current command and plots the relationship between the voltage and the current for each of them, so that straight lines B, C and D are obtained. Therefore, the brightness adjuster
It can be seen that when the brightness is adjusted by 24, equilibrium is achieved at the intersections a, b and c of the straight lines A, B and C and the voltage-current curve Q of the discharge lamp. Here, if the characteristic of the straight line D is obtained by setting the brightness to be small by the brightness adjuster 24, since the straight line D does not intersect the voltage-current curve Q of the discharge lamp, it goes without saying that the discharge lamp 18 Goes out. As a result, the first DC power supply 4 causes the intersection point a to the intersection point c.
It is understood that only dimming up to the range shown in can be performed.

【0018】本実施例はこれよりもさらに低い領域まで
調光範囲を拡大するべく、放電灯18の両端電圧を電圧検
出器22によって検出し、その検出値が交点cより僅かに
低い電圧を閾値VTHとし、この閾値VTHを超えた範囲で
モード切替信号発生器28が「H」のモード切替信号を出
力するようにしてある。モード切替信号が出力される
と、電流指令切替回路26が電流指令を第2の直流電源装
置6に切替入力し、電源切替回路8は第2の直流電源装
置6の出力をインバータ10に切替入力する。よって、こ
の状態では、第2の直流電源装置6による調光が行われ
る。
In this embodiment, the voltage across the discharge lamp 18 is detected by the voltage detector 22 in order to extend the dimming range to a region lower than this, and the detected value is a voltage slightly lower than the intersection point c. It is set to V TH, and the mode switching signal generator 28 outputs the mode switching signal of “H” in the range exceeding this threshold value V TH . When the mode switching signal is output, the current command switching circuit 26 switches and inputs the current command to the second DC power supply device 6, and the power supply switching circuit 8 switches and outputs the output of the second DC power supply device 6 to the inverter 10. To do. Therefore, in this state, dimming by the second DC power supply device 6 is performed.

【0019】図3はこの関係を示したもので、放電灯18
の両端電圧が閾値VTHを越える瞬間の電流指令がXであ
ったとし、これよりもさらに低い電流指令YあるいはZ
を出力するように調整しても、放電灯の電圧電流曲線Q
とはy点あるいはz点で交差し、依然として点灯状態を
維持させることができる。
FIG. 3 shows this relationship, and the discharge lamp 18
It is assumed that the current command at the moment when the voltage across both ends exceeds the threshold value V TH is X, and the current command Y or Z is lower than this.
Even if the output voltage is adjusted to output, the voltage-current curve Q of the discharge lamp
And intersect at the y point or the z point, and the lighting state can still be maintained.

【0020】かくして、放電灯18の両端電圧が閾値VTH
よりも低いときには、第1の直流電源装置4による定電
力調光が行われ、放電灯18の両端電圧が閾値VTH以上の
範囲では第2の直流電源装置6による定電流調光が行わ
れる。このことは、第1の直流電源装置4のみの場合と
比較して、輝度の一層小さい領域まで調光範囲を広げた
ことにほかならない。
Thus, the voltage across the discharge lamp 18 is equal to the threshold value V TH.
When it is lower than the above, constant power dimming is performed by the first DC power supply device 4, and constant current dimming by the second DC power supply device 6 is performed in a range where the voltage across the discharge lamp 18 is equal to or higher than the threshold value V TH. . This is nothing but the extension of the dimming range to a region where the luminance is lower than that in the case of only the first DC power supply device 4.

【0021】なお、上記実施例では、チョッパのオフ時
間を調節する第1の直流電源装置4について説明した
が、オフ時間に限らず、オン時間を調節しても、あるい
は、オン時間およびオフ時間の両方を調節するようにし
ても同様な調光ができる。
In the above embodiment, the first DC power supply device 4 for adjusting the off time of the chopper has been described, but not limited to the off time, the on time may be adjusted, or the on time and the off time may be adjusted. Even if both are adjusted, the same dimming can be performed.

【0022】なおまた、上記実施例ではフルブリッジ型
のインバータを用いたが、これに限らず、プッシュプル
等、各種インバータを用いることができる。
In addition, although the full bridge type inverter is used in the above embodiment, the present invention is not limited to this, and various inverters such as push-pull can be used.

【0023】[0023]

【発明の効果】以上説明したように本発明によれば、直
流交流変換手段の入力電流を制御しているので、立ち消
えの原因となるような休止期間の重畳が行われず、放電
灯の輝度の低い範囲まで調光ができるようになると共
に、放電灯の両端電圧が所定値以上である間、定電流形
の直流電源装置から電流が強制的に供給されるので調光
範囲を一層広げることができる。
As described above, according to the present invention, since the input current of the DC / AC converting means is controlled, the pause period which causes the extinction is not superposed and the brightness of the discharge lamp is controlled. The dimming range can be extended to a low range, and the dimming range can be further expanded because the current is forcibly supplied from the constant current type DC power supply while the voltage across the discharge lamp is above the specified value. it can.

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

【図1】本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】本発明の一実施例の動作を説明するために、第
1の直流電源装置のみによる電圧電流特性を、放電灯の
電圧電流特性と併せて示した特性図。
FIG. 2 is a characteristic diagram showing the voltage-current characteristics of only the first DC power supply device together with the voltage-current characteristics of the discharge lamp in order to explain the operation of one embodiment of the present invention.

【図3】本発明の一実施例の動作を説明するために、第
1の直流電源装置、第2の直流電源装置の各電流電圧特
性を、放電灯の電圧電流特性と併せて示した特性図。
FIG. 3 is a characteristic diagram showing the current-voltage characteristics of the first DC power supply apparatus and the second DC power supply apparatus together with the voltage-current characteristics of the discharge lamp in order to explain the operation of one embodiment of the present invention. Fig.

【符号の説明】[Explanation of symbols]

4 第1の直流電源装置 6 第2の直流電源装置 8 電源切替回路 10 インバータ 12 インバータ制御回路 16 イグナイタ 20 電流検出器 22 電圧検出器 24 輝度調節器 26 電流指令切替回路 28 モード切替信号発生器 4 1st DC power supply device 6 2nd DC power supply device 8 Power supply switching circuit 10 Inverter 12 Inverter control circuit 16 Igniter 20 Current detector 22 Voltage detector 24 Brightness adjuster 26 Current command switching circuit 28 Mode switching signal generator

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 H05B 41/24 H 9249−3K 41/29 C 9249−3K ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location H05B 41/24 H 9249-3K 41/29 C 9249-3K

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】直流を所定周波数の交流に変換して放電灯
に供給する直流交流変換手段と、 この直流交流変換手段の入力電流を検出する電流検出手
段と、 前記放電灯の輝度を設定することにより、この輝度に対
応した電流指令を出力する輝度調節手段と、 定電圧の直流をオンオフし、得られた矩形波電圧を平滑
して前記直流交流変換手段に加えると共に、前記輝度調
節手段の電流指令と前記電流検出手段の電流検出値とが
一致するように、オフ時間及びオン時間の少なくとも一
方を変化させる第1の直流電源装置と、 前記電流指令に対応した直流電流を出力する第2の直流
電源装置と、 前記放電灯の両端電圧を検出する電圧検出手段と、 この電圧検出手段の電圧検出値が所定値以上である間、
モード切替信号を発生するモード切替信号発生手段と、 このモード切替信号発生手段がモード切替信号を発生し
ている間、前記第2の直流電源装置を作動させると共
に、この第2の直流電源装置の出力を前記第1の直流電
源装置の代わりに前記直流交流変換手段に加える切替手
段と、 を備えたことを特徴とする放電灯点灯装置。
1. A DC / AC converting means for converting DC into AC of a predetermined frequency and supplying it to a discharge lamp, a current detecting means for detecting an input current of the DC / AC converting means, and a brightness of the discharge lamp. As a result, a brightness adjusting means for outputting a current command corresponding to the brightness, a constant voltage direct current is turned on and off, and the obtained rectangular wave voltage is smoothed and added to the direct current alternating current converting means. A first DC power supply device that changes at least one of an OFF time and an ON time so that a current command and a current detection value of the current detection unit match, and a second DC power device that outputs a DC current corresponding to the current command. DC power supply device, voltage detection means for detecting the voltage across the discharge lamp, while the voltage detection value of the voltage detection means is a predetermined value or more,
Mode switching signal generating means for generating a mode switching signal, and while the mode switching signal generating means is generating the mode switching signal, the second DC power supply device is operated, and at the same time, the second DC power supply device is operated. A discharge lamp lighting device, comprising: switching means for applying an output to the DC / AC converting means instead of the first DC power supply device.
JP4254848A 1992-09-24 1992-09-24 Electric discharge lamp lighting device Pending JPH06111987A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4254848A JPH06111987A (en) 1992-09-24 1992-09-24 Electric discharge lamp lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4254848A JPH06111987A (en) 1992-09-24 1992-09-24 Electric discharge lamp lighting device

Publications (1)

Publication Number Publication Date
JPH06111987A true JPH06111987A (en) 1994-04-22

Family

ID=17270692

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4254848A Pending JPH06111987A (en) 1992-09-24 1992-09-24 Electric discharge lamp lighting device

Country Status (1)

Country Link
JP (1) JPH06111987A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003100489A (en) * 2001-09-25 2003-04-04 Matsushita Electric Works Ltd Discharge lamp lighting device
WO2005094137A1 (en) * 2004-03-26 2005-10-06 Matsushita Electric Works, Ltd. High voltage discharge lamp lighting apparatus and luminaire
US6958580B2 (en) 2001-06-13 2005-10-25 Matsushita Electric Works, Ltd. Electronic ballast for a high intensity discharge lamp
JP2007172876A (en) * 2005-12-19 2007-07-05 Nec Viewtechnology Ltd Lamp control device and lamp control method
JP2007311088A (en) * 2006-05-17 2007-11-29 Hitachi Media Electoronics Co Ltd Discharge lamp lighting device
JP2013542574A (en) * 2010-11-10 2013-11-21 コーニンクレッカ フィリップス エヌ ヴェ Method and apparatus for driving an HID lamp

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6958580B2 (en) 2001-06-13 2005-10-25 Matsushita Electric Works, Ltd. Electronic ballast for a high intensity discharge lamp
JP2003100489A (en) * 2001-09-25 2003-04-04 Matsushita Electric Works Ltd Discharge lamp lighting device
WO2005094137A1 (en) * 2004-03-26 2005-10-06 Matsushita Electric Works, Ltd. High voltage discharge lamp lighting apparatus and luminaire
JP2005276727A (en) * 2004-03-26 2005-10-06 Matsushita Electric Works Ltd High pressure discharge lamp lighting device and illumination fixture
US7615937B2 (en) 2004-03-26 2009-11-10 Panasonic Electric Works Co., Ltd. High-pressure discharge lamp lighting device and lighting fixture
JP2007172876A (en) * 2005-12-19 2007-07-05 Nec Viewtechnology Ltd Lamp control device and lamp control method
JP2007311088A (en) * 2006-05-17 2007-11-29 Hitachi Media Electoronics Co Ltd Discharge lamp lighting device
JP2013542574A (en) * 2010-11-10 2013-11-21 コーニンクレッカ フィリップス エヌ ヴェ Method and apparatus for driving an HID lamp

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