JPH0513184A - Discharge lamp lighting device - Google Patents
Discharge lamp lighting deviceInfo
- Publication number
- JPH0513184A JPH0513184A JP18418591A JP18418591A JPH0513184A JP H0513184 A JPH0513184 A JP H0513184A JP 18418591 A JP18418591 A JP 18418591A JP 18418591 A JP18418591 A JP 18418591A JP H0513184 A JPH0513184 A JP H0513184A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output voltage
- discharge lamp
- output
- 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.)
- Withdrawn
Links
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、点灯出力を可変できる
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 capable of varying lighting output.
【０００２】[0002]
【従来の技術】直流電源が供給されるインバータに放電
灯の負荷を接続し、この放電灯を高周波点灯する放電灯
点灯装置では、制御回路からインバータに出力制御信号
を入力することで、出力を変化させることができる。こ
の放電灯点灯装置では、ランプ電圧検出回路によって放
電灯に印加される電圧を検出し、この検出回路の検出出
力を比較回路で基準値と比較し、この比較回路の出力を
制御回路の制御入力端子に加えて、放電灯の点灯出力電
圧を制御している。2. Description of the Related Art In a discharge lamp lighting device in which a load of a discharge lamp is connected to an inverter supplied with a DC power source and the discharge lamp is lit at a high frequency, an output control signal is input from a control circuit to the inverter to output the output. Can be changed. In this discharge lamp lighting device, the voltage applied to the discharge lamp is detected by the lamp voltage detection circuit, the detection output of this detection circuit is compared with the reference value by the comparison circuit, and the output of this comparison circuit is input to the control input of the control circuit. In addition to the terminals, it controls the lighting output voltage of the discharge lamp.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このように比
較回路の出力電圧により、直接点灯出力電圧の制御を行
なおうとすると、ランプ電圧検出回路の時定数の遅れに
より、実際は出力電圧が高くても、検出回路の出力電圧
が低いため、制御回路が出力電圧を上昇させるように動
作する。これにより始動時などにオーバシュートが生じ
て、放電灯に高電圧が印加され、一瞬放電灯が明るく光
るいわゆるオン・ピカの現象が発生するようになる。こ
のような現象は使用者に違和感や不快感を与えるだけで
なく、フィラメントが十分に予熱されないうちの点灯
（コールドスタート）により、放電灯の早期黒化の原因
となって、寿命の低下を招く。図３は、この従来の不具
合を説明したものであり、電源投入からＴの期間がラン
プ電圧検出回路の時定数による遅れ時間に相当する。図
３（ａ）で、符号のＶ1 はランプ電圧検出回路の検出電
圧、符号のＶ2 は時定数回路の出力電圧、符号のＶ3 は
比較回路の出力電圧すなわち制御回路への入力電圧Ｖin
を示す。また図３（ｂ）は、放電灯の点灯出力電圧Ｖou
t の時間変化を示し、従来は時間帯Ｔ1において、検出
電圧が低いが出力電圧が高いという動作になるため、高
い出力電圧によりこの一瞬だけ放電灯が点灯するモー
ド、すなわちオン・ピカ現象が発生していたことがわか
る。そこで、ランプ電圧検出回路の時定数を短くして上
述した不具合を解消することが考えられるが、このよう
にすると電圧安定化のためのフィードバック回路が発振
したり、リンギングなどの発生を招いたり、ノイズに弱
くなるという問題が逆に生じるようになる。However, when it is attempted to directly control the lighting output voltage by the output voltage of the comparison circuit, the output voltage is actually high due to the delay of the time constant of the lamp voltage detection circuit. However, since the output voltage of the detection circuit is low, the control circuit operates to increase the output voltage. As a result, an overshoot occurs at the time of starting, a high voltage is applied to the discharge lamp, and a so-called on-pica phenomenon occurs in which the discharge lamp shines brightly for a moment. Such a phenomenon not only gives the user a feeling of discomfort or discomfort, but also causes the blackening of the discharge lamp early due to lighting (cold start) before the filament is sufficiently preheated, resulting in a shortened life. .. FIG. 3 illustrates this conventional problem, in which the period T from power-on corresponds to the delay time due to the time constant of the lamp voltage detection circuit. In FIG. 3A, reference numeral V1 is the detection voltage of the lamp voltage detection circuit, reference numeral V2 is the output voltage of the time constant circuit, and reference numeral V3 is the output voltage of the comparison circuit, that is, the input voltage Vin to the control circuit.
Indicates. Further, FIG. 3B shows the lighting output voltage Vou of the discharge lamp.
It shows the change of t with time. Conventionally, in time zone T1, the operation is such that the detection voltage is low but the output voltage is high, so the mode in which the discharge lamp is lit only for this moment due to the high output voltage, that is, the on-picker phenomenon occurs. I understand that I was doing. Therefore, it is conceivable to shorten the time constant of the lamp voltage detection circuit to solve the above-mentioned inconvenience, but if this is done, the feedback circuit for voltage stabilization may oscillate, or ringing may occur. The problem of becoming weak to noise comes to the reverse.
【０００４】本発明は、このような従来の技術が有する
課題を解決するために提案されたものであり、電源投入
時に一瞬、放電灯が明るく光るいわゆるオン・ピカの現
象を防ぐことができ、放電灯の寿命を延ばせる放電灯点
灯装置を提供することを目的とする。The present invention has been proposed in order to solve the problems of the prior art, and it is possible to prevent a so-called on-pica phenomenon in which the discharge lamp shines brightly for a moment when the power is turned on. An object of the present invention is to provide a discharge lamp lighting device that can extend the life of the discharge lamp.
【０００５】[0005]
【課題を解決するための手段】この目的を達成するため
に本発明は、直流電源が供給されるインバータに放電灯
を含む負荷共振回路を接続し、この放電灯をインバータ
の出力により高周波点灯し、制御回路からインバータに
出力制御信号を入力して点灯出力を制御する放電灯点灯
装置において、上記放電灯に印加される電圧を検出する
ランプ電圧検出回路と、このランプ電圧検出回路の出力
を積分する時定数回路と、この時定数回路の出力電圧と
所定値とを比較し、定常時は上記時定数回路の出力電圧
に比べて小さな比較出力電圧を取り出せる比較回路と、
この比較回路の出力電圧と上記時定数回路の出力電圧の
うち低い方の出力電圧に応じてインバータの出力を制御
する制御回路とを有する構成である。In order to achieve this object, the present invention connects a load resonance circuit including a discharge lamp to an inverter to which a DC power source is supplied, and turns on the discharge lamp at a high frequency by the output of the inverter. In a discharge lamp lighting device that controls a lighting output by inputting an output control signal from a control circuit to an inverter, a lamp voltage detection circuit that detects a voltage applied to the discharge lamp and an output of the lamp voltage detection circuit are integrated. A time constant circuit that compares the output voltage of the time constant circuit with a predetermined value, and in a steady state, a comparison circuit that can extract a comparative output voltage smaller than the output voltage of the time constant circuit,
The control circuit controls the output of the inverter according to the lower output voltage of the output voltage of the comparison circuit and the output voltage of the time constant circuit.
【０００６】[0006]
【作用】電源投入時は、時定数回路の遅れで、比較回路
の出力電圧に比べて時定数回路の出力電圧が低くなる
が、低いほうの出力電圧に応じてインバータの出力を制
御するので、電源投入時に一瞬に放電灯が明るく点灯す
るような不具合を防げる。When the power is turned on, the output voltage of the time constant circuit becomes lower than the output voltage of the comparison circuit due to the delay of the time constant circuit, but since the output of the inverter is controlled according to the lower output voltage, You can prevent the problem that the discharge lamp lights up brightly in a moment when the power is turned on.
【０００７】[0007]
【実施例】以下、本発明による放電灯点灯装置の具体的
な実施例を図面に基づき詳細に説明する。図１の回路図
に、この放電灯点灯装置の一実施例を示す。この図で、
直流電源１を高周波交流に変換して点灯出力を取り出す
インバータ２には、共振回路の一部を構成するインダク
タ３を介して放電灯４の負荷が接続される。この放電灯
４のフィラメント間には、直列にコンデンサ５が接続さ
れる。このインバータ２には、放電灯４の点灯出力電圧
を制御するための制御信号が制御回路６から入力され
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the discharge lamp lighting device according to the present invention will be described in detail below with reference to the drawings. An embodiment of this discharge lamp lighting device is shown in the circuit diagram of FIG. In this figure,
The load of the discharge lamp 4 is connected to an inverter 2 that converts the DC power supply 1 into a high-frequency AC and extracts a lighting output through an inductor 3 that forms a part of a resonance circuit. A capacitor 5 is connected in series between the filaments of the discharge lamp 4. A control signal for controlling the lighting output voltage of the discharge lamp 4 is input to the inverter 2 from the control circuit 6.
【０００８】インダクタ３と放電灯４の接続点には、ラ
ンプ電圧検出回路７の一部を構成するコンデンサ８，９
の直列回路の一端が接続され、この直列回路の他端は接
地される。なお、コンデンサ９には接地側をアノードす
るダイオード１０が並列に接続される。これらコンデン
サ８，９の接続点は、一端を接地したコンデンサ１２の
他端にダイオード１１を介して接続される。ランプ電圧
検出回路７のコンデンサ１２の両端には、時定数回路１
３を構成する抵抗１４とコンデンサ１５の直列回路が接
続され、これら抵抗１４とコンデンサ１５の接続点は時
定数回路１３側をカソードとするダイオード１６を介し
て制御回路６の制御入力端子C.INに接続される。時定数
回路１３には、抵抗１７、可変抵抗１８および抵抗１９
の直列回路が並列に接続され、可変抵抗１８の中間タッ
プは比較回路２０の反転入力端子に接続される。この比
較回路２０の非反転入力端子には、基準電圧源２１が接
続される。比較回路２０の出力端子は、トランジスタ２
２のベースに接続される。このトランジスタ２２のエミ
ッタは接地され、コレクタはトランジスタ２２側にカソ
ードが向くダイオード２３を介して制御回路６の制御入
力端子C.INに接続される。At the connection point between the inductor 3 and the discharge lamp 4, capacitors 8 and 9 forming a part of the lamp voltage detection circuit 7 are formed.
One end of the series circuit is connected and the other end of the series circuit is grounded. A diode 10 having a ground side as an anode is connected in parallel to the capacitor 9. The connection point of these capacitors 8 and 9 is connected via a diode 11 to the other end of a capacitor 12 whose one end is grounded. The time constant circuit 1 is provided across the capacitor 12 of the lamp voltage detection circuit 7.
3 is connected to a series circuit of a resistor 14 and a capacitor 15, and the connection point of the resistor 14 and the capacitor 15 is connected to a control input terminal C.IN of the control circuit 6 via a diode 16 having a cathode on the time constant circuit 13 side. Connected to. The time constant circuit 13 includes a resistor 17, a variable resistor 18 and a resistor 19.
Are connected in parallel, and the intermediate tap of the variable resistor 18 is connected to the inverting input terminal of the comparison circuit 20. A reference voltage source 21 is connected to the non-inverting input terminal of the comparison circuit 20. The output terminal of the comparison circuit 20 is the transistor 2
2 connected to the base. The emitter of the transistor 22 is grounded, and the collector is connected to the control input terminal C.IN of the control circuit 6 via the diode 23 whose cathode faces the transistor 22 side.
【０００９】このように構成される放電灯点灯装置で
は、ランプ電圧点灯回路７によって放電灯４に印加され
る電圧が検出され、この検出出力電圧が時定数回路１３
によって積分される。図２（ａ）で、符号のＶ1 はラン
プ電圧検出回路７の出力電圧を示し、符号のＶ2 は時定
数回路１３の出力電圧を示す。この時定数回路１３の出
力電圧は、比較回路２０において基準電圧源２１からの
所定値と比較される。図２（ａ）で、符号のＶ3 は比較
回路の出力電圧を示す。 この図２（ａ）に示すように
電源投入時からランプ電圧検出回路７の時定数による遅
れが生じる期間Ｔは、時定数回路１３の出力電圧に比べ
て比較回路２０の出力電圧の方が高く、この比較回路２
０の出力によりトランジスタ２２がオン状態となる。こ
れにより期間Ｔでは、比較回路２０の出力電圧よりも低
い時定数回路１３の出力電圧が制御回路６の制御入力端
子C.INに加えられ、時定数回路１３の出力電圧に応じて
点灯出力電圧が制御されるような出力制御信号がインバ
ータ２に入力される。期間Ｔを過ぎると、時定数回路１
３の出力電圧に比べて比較回路２０の出力電圧が低くな
るので、この比較回路２０の出力電圧が制御回路６の制
御入力端子C.INに加えられる。図２（ａ）で、符号のＶ
inはこの制御入力端子C.INに加えられる入力電圧を示
す。これにより図２（ｂ）に示すように電源投入と共に
点灯出力電圧Ｖout が徐々に上昇してソフトスタートモ
ードにスムーズに移行し、従来、電源投入時に生じてい
たいわゆるオン・ピカの発生が防止できる。In the discharge lamp lighting device configured as described above, the voltage applied to the discharge lamp 4 is detected by the lamp voltage lighting circuit 7, and the detected output voltage is the time constant circuit 13.
Is integrated by In FIG. 2A, reference numeral V1 indicates the output voltage of the lamp voltage detection circuit 7, and reference numeral V2 indicates the output voltage of the time constant circuit 13. The output voltage of the time constant circuit 13 is compared with a predetermined value from the reference voltage source 21 in the comparison circuit 20. In FIG. 2A, reference numeral V3 represents the output voltage of the comparison circuit. As shown in FIG. 2A, the output voltage of the comparison circuit 20 is higher than the output voltage of the time constant circuit 13 during the period T in which a delay occurs due to the time constant of the lamp voltage detection circuit 7 after the power is turned on. , This comparison circuit 2
The output of 0 turns on the transistor 22. Accordingly, in the period T, the output voltage of the time constant circuit 13 lower than the output voltage of the comparison circuit 20 is applied to the control input terminal C.IN of the control circuit 6, and the lighting output voltage is changed according to the output voltage of the time constant circuit 13. An output control signal for controlling the is input to the inverter 2. After the period T, the time constant circuit 1
Since the output voltage of the comparison circuit 20 is lower than that of the output voltage of 3, the output voltage of the comparison circuit 20 is applied to the control input terminal C.IN of the control circuit 6. In FIG. 2A, the symbol V
in indicates the input voltage applied to this control input terminal C.IN. As a result, as shown in FIG. 2 (b), the lighting output voltage Vout gradually rises when the power is turned on, and smoothly shifts to the soft start mode, so that the occurrence of so-called on-picker that has conventionally occurred when the power was turned on can be prevented. ..
【００１０】[0010]
【発明の効果】以上説明したように本発明によれば、電
源投入時にソフトスタートさせながら放電灯を点灯する
にあたって、一瞬放電灯が明るく点灯するいわゆるオン
・ピカの発生を防止することができるので、電源投入時
の不自然さが解消されるとともに、放電灯の寿命を延ば
すことができる。As described above, according to the present invention, when the discharge lamp is lit while performing a soft start when the power is turned on, it is possible to prevent the occurrence of so-called on-pica in which the discharge lamp illuminates brightly for a moment. The unnaturalness at the time of turning on the power is eliminated, and the life of the discharge lamp can be extended.
【図１】本発明による放電灯点灯装置の一実施例を示す
回路図である。FIG. 1 is a circuit diagram showing an embodiment of a discharge lamp lighting device according to the present invention.
【図２】図１の放電灯点灯装置の動作を説明するための
動作説明図である。FIG. 2 is an operation explanatory view for explaining an operation of the discharge lamp lighting device of FIG.
【図３】従来の放電灯点灯装置の不具合を説明する動作
説明図である。[Fig. 3] Fig. 3 is an operation explanatory diagram illustrating a problem of the conventional discharge lamp lighting device.
１ 直流電源 ２ インバータ ３ インダクタ ４ 放電灯 ５ コンデンサ ６ 制御回路 ７ ランプ電圧検出回路 １３ 時定数回路 １６，２３ ダイオード ２０ 比較回路 ２１ 基準電圧源 ２２ トランジスタ 1 DC power supply 2 Inverter 3 Inductor 4 Discharge lamp 5 Capacitor 6 Control circuit 7 Lamp voltage detection circuit 13 Time constant circuit 16,23 Diode 20 Comparison circuit 21 Reference voltage source 22 Transistor
Claims (1)
灯を含む負荷共振回路を接続し、この放電灯をインバー
タの出力により高周波点灯し、制御回路からインバータ
に出力制御信号を入力して点灯出力を制御する放電灯点
灯装置において、 上記放電灯に印加される電圧を検出するランプ電圧検出
回路と、このランプ電圧検出回路の出力を積分する時定
数回路と、この時定数回路の出力電圧と所定値とを比較
し、定常時は上記時定数回路の出力電圧に比べて小さな
比較出力電圧を取り出せる比較回路と、この比較回路の
出力電圧と上記時定数回路の出力電圧のうち低い方の出
力電圧に応じてインバータの出力を制御する制御回路と
を有することを特徴とする放電灯点灯装置。Claim: What is claimed is: 1. A load resonance circuit including a discharge lamp is connected to an inverter to which a DC power source is supplied, the discharge lamp is lit at a high frequency by the output of the inverter, and an output control signal is output from the control circuit to the inverter. In the discharge lamp lighting device for controlling the lighting output by inputting, the lamp voltage detection circuit that detects the voltage applied to the discharge lamp, the time constant circuit that integrates the output of this lamp voltage detection circuit, and this time constant. The output voltage of the circuit is compared with a predetermined value, and in a steady state, a comparison circuit that can take out a comparative output voltage smaller than the output voltage of the time constant circuit, and the output voltage of this comparison circuit and the output voltage of the time constant circuit A discharge lamp lighting device, comprising: a control circuit that controls the output of the inverter according to the lower one of the output voltages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18418591A JPH0513184A (en) | 1991-06-28 | 1991-06-28 | Discharge lamp lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18418591A JPH0513184A (en) | 1991-06-28 | 1991-06-28 | Discharge lamp lighting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0513184A true JPH0513184A (en) | 1993-01-22 |
Family
ID=16148851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18418591A Withdrawn JPH0513184A (en) | 1991-06-28 | 1991-06-28 | Discharge lamp lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0513184A (en) |
-
1991
- 1991-06-28 JP JP18418591A patent/JPH0513184A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980903 |