JP2003317993A - Lighting system - Google Patents
Lighting systemInfo
- Publication number
- JP2003317993A JP2003317993A JP2003117897A JP2003117897A JP2003317993A JP 2003317993 A JP2003317993 A JP 2003317993A JP 2003117897 A JP2003117897 A JP 2003117897A JP 2003117897 A JP2003117897 A JP 2003117897A JP 2003317993 A JP2003317993 A JP 2003317993A
- Authority
- JP
- Japan
- Prior art keywords
- dimming
- lower limit
- voltage
- control voltage
- discharge lamp
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、連続的に調光でき
る放電灯点灯装置に係わり、さらに詳しくは、放電灯の
調光範囲の下限設定が可能な照明システムに関するもの
である。
【０００２】
【従来の技術】放電灯の調光範囲の下限設定については
例えばＪＩＳ・Ｃ８１２０−２（１９９９）に記載され
ている。図３はそのＪＩＳ・Ｃ８１２０−２に記載され
た調光曲線の概要を示すデューティ・光束出力特性図で
ある。この図に示すように調光コントローラから送出さ
れる調光信号のデューティ（パルス幅）が９０％のとき
に放電灯の光束出力の下限が４０％になるように、調光
信号のデューティが９０％のときにその光束出力の下限
が２５％になるように、また、調光信号のデューティが
９０％のときに光束出力が５％になるように設定されて
いる。
【０００３】
【発明が解決しようとする課題】しかしながら、前述し
た従来の放電灯点灯装置では、図３に示す特性図からも
明らかなように調光範囲の下限が異なる毎に調光曲線が
異なっているので、デューティの同じ調光信号で調光を
行っても放電灯の光束出力が異なってしまい、そのた
め、特性の異なる放電灯点灯装置を同一照明システム上
に用いる場合には、調光範囲の下限を合わせなければ使
用できなかった。
【０００４】本発明は、かかる課題を解決するためにな
されたもので、調光範囲の下限が異なっても、その下限
値まで同じ調光曲線になる照明システムを提供すること
を目的とする。
【０００５】
【課題を解決するための手段】本発明に係る照明システ
ムは、調光信号を出力する調光コントローラと、この調
光コントローラから出力される調光信号に基づき複数の
放電灯を調光する複数の放電灯点灯装置を備えた照明シ
ステムであって、複数の放電灯点灯装置それぞれは、直
流電圧を高周波電圧に変換するインバータ回路と、この
インバータ回路から発生する高周波電圧を放電灯に供給
する負荷回路と、調光信号のパルス幅が大きくなるに従
って電圧値が低下する直流電圧を生成し、この直流電圧
を放電灯の調光の制御電圧としてインバータ回路側に出
力する同じ特性の調光制御電圧生成手段と、互いに異な
る下限制御電圧を生成し、制御電圧がその下限制御電圧
よりも低下したときに下限制御電圧をインバータ回路側
に出力する調光下限設定手段とを備えたものである。
【０００６】
【発明の実施の形態】図１は本発明の実施の形態の照明
システムにおける放電灯点灯装置の調光回路の構成を示
す回路図である。図において、１はブリッジ状に接続さ
れた４つのダイオードで、図示せぬ調光コントローラか
ら送出される調光信号（ＰＷＭ信号）のパルス波形の方
向を一定にするためである。２はフォトカプラで、調光
信号がHighレベルのときに発光する発光ダイオードＬＥ
Ｄと、発光ダイオードＬＥＤが発光したときオンするフ
ォトトランジスタＰＴとからなっている。
【０００７】３は調光制御電圧生成回路で、フォトトラ
ンジスタＰＴに並列に接続され、フォトトランジスタＰ
ＴがオンしたときオフするトランジスタＱ１と、トラン
ジスタＱ１に並列に接続され、トランジスタＱ１がオフ
のときオンするトランジスタＱ２と、１５Ｖの直流電源
ラインとトランジスタＱ２のコレクタ側との間に直列に
接続された抵抗Ｒ１，Ｒ２と、抵抗Ｒ１，Ｒ２の接続点
とアース側のラインとの間に直列に接続された抵抗Ｒ３
及びコンデンサＣ１とで構成されている。
【０００８】この調光制御電圧生成回路３は、調光信号
がHighレベルのときトランジスタＱ１がオフ、トランジ
スタＱ２がオンしてコンデンサＣ１に充電された電圧を
放電し、調光信号がLow レベルのときはトランジスタＱ
１がオン、トランジスタＱ２がオフする。この時、Ａ部
に発生する１５Ｖを抵抗Ｒ１，Ｒ２によって分圧し、抵
抗Ｒ３を介してコンデンサＣ１に充電する。このコンデ
ンサＣ１の電圧は、トランジスタＱ２のオン期間（調光
信号のパルス幅）が長くなるにつれ電圧値が直線的に低
下していく。なお、トランジスタＱ１，Ｑ２の交互のス
イッチング動作によって、フォトトランジスタＰＴに生
成される調光信号のパルス波形の「なまり」が整形され
る。
【０００９】４はダイオードＤ１と平滑コンデンサＣ２
とからなる整流・平滑回路で、トランジスタＱ２のスイ
ッチング動作により充放電を繰り返すコンデンサＣ１の
電圧を整流・平滑する。５は平滑されたコンデンサＣ１
の電圧を抵抗Ｒ６，Ｒ７で分圧する分圧回路、Ｃ３は分
圧回路５によって分圧されたＢ部の電圧をさらに直流化
する平滑コンデンサである。
【００１０】このＢ部に発生する電圧（制御電圧）によ
ってインバータ回路側のスイッチング素子のオン期間が
決定され、つまり、コンデンサＣ１の電圧が高くなれば
インバータ回路側のスイッチング素子のオン期間が長く
なり、放電灯の光束が増大する。逆にコンデンサＣ１の
電圧が低くなればそのスイッチング素子のオン期間が短
くなり、放電灯の光束が減少する。
【００１１】６は調光下限設定回路で、１５Ｖの直流電
源ラインとアース側のラインとの間に直列に接続された
抵抗Ｒ４，Ｒ５と、抵抗Ｒ４，Ｒ５の間に挿入されたダ
イオードＤ２、Ｄ３と、アノードが抵抗Ｒ４とダイオー
ドＤ２の接続点に、カソードが整流・平滑回路４のダイ
オードＤ１と平滑コンデンサＣ２の接続点にそれぞれ接
続されたダイオードＤ４とで構成されている。
【００１２】この調光下限設定回路６は、例えば、放電
灯の光束出力の下限を４０％とした場合、その出力を得
るのに必要な下限制御電圧を抵抗Ｒ４，Ｒ５とダイオー
ドＤ２、Ｄ３とで分圧してＣ部に発生させるようにした
もので、調光信号のデューティによってＤ部に発生する
制御電圧が下限制御電圧よりも低いときは、その下限制
御電圧によってインバータ回路側のスイッチング素子の
オン期間が決定される。つまり、この場合では、放電灯
の光束出力の下限が４０％と固定される。
【００１３】次に、本実施の形態の動作を図２の特性図
を参照しながら説明する。図２は実施の形態における調
光信号のデューティと放電灯の光束出力の相関を示すデ
ューティ・光束出力特性図である。デューティが５％の
調光信号が入力されているときは、トランジスタＱ２の
オン期間が短いので、コンデンサＣ１からトランジスタ
Ｑ２側に放電される時間が短く、抵抗Ｒ４を介してコン
デンサＣ２に充電される時間が長くなる。そのため、Ｂ
部に放電灯の光束出力が１００％となる高い制御電圧が
発生する。
【００１４】この状態において、調光信号のデューティ
を徐々に上げると、トランジスタＱ２のオン期間がそれ
に伴って徐々に長くなり、コンデンサＣ１からトランジ
スタＱ２側に放電される時間が徐々に長くなり、抵抗Ｒ
４を介してコンデンサＣ２に充電される時間が短くなっ
ていき、Ｂ部に印加された制御電圧が低下していく。こ
の時、図２の実線に示すように放電灯の光束出力が徐々
に低下する。
【００１５】そして、Ｄ部に印加される制御電圧が調光
下限設定回路６のＣ部に発生している下限制御電圧より
も低下すると、その下限制御電圧によってインバータ回
路側のスイッチング素子のオン期間が決定されるので、
調光信号のデューティをさらに上げても放電灯の光束出
力がその下限制御電圧によって保持される。従って、放
電灯の光束出力の下限が４０％となるよう下限制御電圧
が設定されていた場合は、図２に示す実線が４０％の所
で水平となり、また、放電灯の光束出力の下限が２５％
となるよう下限制御電圧が設定されていた場合は、２５
％の所で水平となり、また、放電灯の光束出力の下限が
５％となるよう下限制御電圧が設定されていた場合は、
調光信号のデューティが９０％を超えていても保持され
る。
【００１６】また、低温下において低調光を行った際、
放電灯の特性上、光束が低下するが、調光下限設定回路
６のダイオードＤ２，Ｄ３の温度特性により、Ｃ部に発
生する下限制御電圧が上がるので、放電灯の光束出力を
確保できる。
【００１７】このように本実施の形態においては、調光
範囲の下限が異なっていてもその下限値までの調光曲線
が同じになるよう調光制御電圧生成回路３で行い、しか
も、調光範囲の下限値を調光下限設定回路６で行ってい
るので、調光範囲の下限が異なる放電灯点灯装置であっ
ても同一照明システム上に容易に組み合わせることがで
きるという効果がある。
【００１８】また、低温下で低調光を行う際、常温時と
比べ放電灯の光束が低下してチラツキが起きるが、調光
下限設定回路６のダイオードＤ２，Ｄ３の温度特性によ
って下限制御電圧が上がり、これに伴って放電灯の光束
出力が上がるため、放電灯のチラツキが起きにくくなる
という効果がある。
【００１９】なお、前述した実施の形態では、調光制御
電圧生成回路３と調光下限設定回路６の一部品として抵
抗Ｒ１〜Ｒ５を用いたことを述べたが、これに代えてイ
ンピーダンスを有する素子例えばインダクタを用いても
よい。また、調光下限設定回路６に低調光時の放電灯の
チラツキ防止としてダイオードＤ２，Ｄ３を用いたこと
を述べたが、同じ温度特性を有する素子例えば負特性の
サーミスタ等を用いてもよい。
【００２０】
【発明の効果】以上のように本発明によれば、調光信号
のパルス幅が大きくなるに従って電圧値が低下する直流
電圧を生成すると共に、その直流電圧を放電灯の調光の
制御電圧としてインバータ回路側に出力し、かつ、放電
灯の調光範囲の下限を設定する下限制御電圧を生成し、
制御電圧が下限制御電圧よりも低下したときに下限制御
電圧をインバータ回路側に出力するようにしたので、調
光範囲の下限が異なってもその下限値までの調光曲線が
同一となり、しかも、調光範囲の下限が異なる放電灯点
灯装置であっても同一照明システム上に容易に組み合わ
せることができるという効果がある。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a discharge lamp lighting device capable of continuously dimming, and more particularly, to setting a lower limit of a dimming range of a discharge lamp. The present invention relates to a lighting system. 2. Description of the Related Art The lower limit of the dimming range of a discharge lamp is described in, for example, JIS C8120-2 (1999). FIG. 3 is a duty / luminous flux output characteristic diagram showing an outline of a dimming curve described in JIS C8120-2. As shown in this figure, when the duty (pulse width) of the dimming signal sent from the dimming controller is 90%, the duty of the dimming signal is set to 90% so that the lower limit of the luminous flux output of the discharge lamp becomes 40%. %, The lower limit of the luminous flux output is set to 25%, and when the duty of the dimming signal is 90%, the luminous flux output is set to 5%. [0003] However, in the above-described conventional discharge lamp lighting device, the dimming curve is different every time the lower limit of the dimming range is different, as is clear from the characteristic diagram shown in FIG. Therefore, even if dimming is performed with a dimming signal having the same duty, the luminous flux output of the discharge lamp is different. Therefore, when using discharge lamp lighting devices having different characteristics on the same lighting system, the dimming range is It could not be used unless the lower limit was adjusted. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide an illumination system in which even if the lower limit of the dimming range is different, the same dimming curve is obtained up to the lower limit. A lighting system according to the present invention includes a dimming controller that outputs a dimming signal, and a plurality of discharge lamps that are adjusted based on the dimming signal output from the dimming controller. A lighting system including a plurality of discharge lamp lighting devices that emit light, wherein each of the plurality of discharge lamp lighting devices includes an inverter circuit that converts a DC voltage to a high-frequency voltage, and a high-frequency voltage generated from the inverter circuit to a discharge lamp. A load circuit to supply and a DC voltage whose voltage value decreases as the pulse width of the dimming signal increases, and outputs the DC voltage to the inverter circuit side as a dimming control voltage of the discharge lamp to the inverter circuit side. The light control voltage generation means generates a lower limit control voltage different from the lower limit control voltage, and outputs the lower limit control voltage to the inverter circuit when the control voltage falls below the lower limit control voltage. And a dimming lower limit setting means. FIG. 1 is a circuit diagram showing a configuration of a dimming circuit of a discharge lamp lighting device in an illumination system according to an embodiment of the present invention. In the drawing, reference numeral 1 denotes four diodes connected in a bridge to make the direction of a pulse waveform of a dimming signal (PWM signal) sent from a dimming controller (not shown) constant. Reference numeral 2 denotes a photocoupler which emits light when a dimming signal is at a high level.
D and a phototransistor PT that is turned on when the light emitting diode LED emits light. Reference numeral 3 denotes a dimming control voltage generation circuit, which is connected in parallel to the phototransistor PT.
A transistor Q1 that is turned off when T is turned on, a transistor Q2 that is connected in parallel to the transistor Q1 and is turned on when the transistor Q1 is turned off, and a transistor Q2 that is connected in series between a 15 V DC power supply line and the collector side of the transistor Q2. And a resistor R3 connected in series between a connection point of the resistors R1 and R2 and a line on the ground side.
And a capacitor C1. The dimming control voltage generating circuit 3 turns off the transistor Q1 and turns on the transistor Q2 when the dimming signal is at a high level to discharge the voltage charged in the capacitor C1. When transistor Q
1 turns on and the transistor Q2 turns off. At this time, the voltage of 15V generated in the portion A is divided by the resistors R1 and R2, and the capacitor C1 is charged via the resistor R3. The voltage value of the capacitor C1 decreases linearly as the ON period (pulse width of the dimming signal) of the transistor Q2 increases. Note that the “rounding” of the pulse waveform of the dimming signal generated in the phototransistor PT is shaped by the alternate switching operation of the transistors Q1 and Q2. 4 is a diode D1 and a smoothing capacitor C2.
And rectifies and smoothes the voltage of the capacitor C1 which repeats charging and discharging by the switching operation of the transistor Q2. 5 is a smoothed capacitor C1
Is a voltage dividing circuit that divides the voltage by the resistors R6 and R7, and C3 is a smoothing capacitor that further converts the voltage of the portion B divided by the voltage dividing circuit 5 into DC. The on-period of the switching element on the inverter circuit side is determined by the voltage (control voltage) generated at the portion B. That is, the higher the voltage of the capacitor C1, the longer the on-period of the switching element on the inverter circuit side. As a result, the luminous flux of the discharge lamp increases. Conversely, when the voltage of the capacitor C1 decreases, the ON period of the switching element decreases, and the luminous flux of the discharge lamp decreases. Reference numeral 6 denotes a dimming lower limit setting circuit which includes resistors R4 and R5 connected in series between a 15V DC power supply line and a ground side line, and a diode D2 inserted between the resistors R4 and R5. D3 and a diode D4 having an anode connected to a connection point between the resistor R4 and the diode D2, and a cathode connected to a connection point between the diode D1 and the smoothing capacitor C2 of the rectifying / smoothing circuit 4. For example, when the lower limit of the luminous flux output of the discharge lamp is 40%, the dimming lower limit setting circuit 6 sets the lower limit control voltage necessary for obtaining the output to the resistors R4 and R5 and the diodes D2 and D3. When the control voltage generated in the D section due to the duty of the dimming signal is lower than the lower limit control voltage, the lower limit control voltage causes the voltage of the switching element of the inverter circuit to be increased. The ON period is determined. That is, in this case, the lower limit of the luminous flux output of the discharge lamp is fixed at 40%. Next, the operation of this embodiment will be described with reference to the characteristic diagram of FIG. FIG. 2 is a duty / luminous flux output characteristic diagram showing a correlation between the duty of the dimming signal and the luminous flux output of the discharge lamp in the embodiment. When a dimming signal having a duty of 5% is input, the on-period of the transistor Q2 is short, so that the discharging time from the capacitor C1 to the transistor Q2 is short, and the capacitor C2 is charged via the resistor R4. The time gets longer. Therefore, B
A high control voltage at which the luminous flux output of the discharge lamp becomes 100% is generated in the unit. In this state, when the duty of the dimming signal is gradually increased, the on-period of the transistor Q2 is gradually increased accordingly, the time for discharging from the capacitor C1 to the transistor Q2 is gradually increased, and the resistance is reduced. R
4, the time required for charging the capacitor C2 becomes shorter, and the control voltage applied to the portion B decreases. At this time, the luminous flux output of the discharge lamp gradually decreases as shown by the solid line in FIG. When the control voltage applied to the portion D becomes lower than the lower limit control voltage generated in the portion C of the dimming lower limit setting circuit 6, the lower limit control voltage causes the ON period of the switching element on the inverter circuit side. Is determined,
Even if the duty of the dimming signal is further increased, the luminous flux output of the discharge lamp is maintained at the lower limit control voltage. Therefore, when the lower limit control voltage is set so that the lower limit of the luminous flux output of the discharge lamp is 40%, the solid line shown in FIG. 2 is horizontal at 40%, and the lower limit of the luminous flux output of the discharge lamp is 40%. 25%
If the lower limit control voltage is set to be
%, And the lower limit control voltage is set so that the lower limit of the luminous flux output of the discharge lamp is 5%.
Even if the duty of the dimming signal exceeds 90%, it is maintained. When low light control is performed at a low temperature,
Although the luminous flux decreases due to the characteristics of the discharge lamp, the lower limit control voltage generated in the portion C increases due to the temperature characteristics of the diodes D2 and D3 of the dimming lower limit setting circuit 6, so that the luminous flux output of the discharge lamp can be secured. As described above, in the present embodiment, even if the lower limit of the dimming range is different, the dimming control voltage generating circuit 3 performs the dimming control so that the dimming curve up to the lower limit is the same. Since the lower limit of the range is set by the dimming lower limit setting circuit 6, there is an effect that even discharge lamp lighting devices having different lower limits of the dimming range can be easily combined on the same lighting system. Further, when performing low dimming at a low temperature, the luminous flux of the discharge lamp is reduced compared with that at normal temperature, causing flickering. As a result, the luminous flux output of the discharge lamp is increased, which has the effect that flicker of the discharge lamp is less likely to occur. In the above-described embodiment, the resistors R1 to R5 are used as components of the dimming control voltage generating circuit 3 and the dimming lower limit setting circuit 6. However, the resistors R1 to R5 have impedance instead. An element such as an inductor may be used. In addition, although the diodes D2 and D3 are used in the dimming lower limit setting circuit 6 to prevent flicker of the discharge lamp at the time of low dimming, elements having the same temperature characteristic, for example, a thermistor having a negative characteristic may be used. As described above, according to the present invention, a DC voltage whose voltage value decreases as the pulse width of a dimming signal increases is generated, and the DC voltage is used for dimming a discharge lamp. Output to the inverter circuit side as a control voltage, and generate a lower limit control voltage that sets the lower limit of the dimming range of the discharge lamp,
When the control voltage is lower than the lower limit control voltage, the lower limit control voltage is output to the inverter circuit side, so that even if the lower limit of the dimming range is different, the dimming curve up to the lower limit is the same, and There is an effect that even discharge lamp lighting devices having different lower limits of the dimming range can be easily combined on the same lighting system.
【図面の簡単な説明】
【図１】 本発明の実施の形態の照明システムにおける
放電灯点灯装置の調光回路の構成を示す回路図である。
【図２】 実施の形態における調光信号のデューティと
放電灯の光束出力の相関を示すデューティ・光束出力特
性図である。
【図３】 ＪＩＳ・Ｃ８１２０−２に記載された調光曲
線の概要を示すデューティ・光束出力特性図である。
【符号の説明】
２ フォトカプラ、３ 調光制御電圧生成回路、４ 整
流・平滑回路、５ 分圧回路、６ 調光下限設定回路。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a configuration of a dimming circuit of a discharge lamp lighting device in an illumination system according to an embodiment of the present invention. FIG. 2 is a duty / luminous flux output characteristic diagram showing a correlation between a duty of a dimming signal and a luminous flux output of a discharge lamp in the embodiment. FIG. 3 is a duty / luminous flux output characteristic diagram showing an outline of a dimming curve described in JIS C8120-2. [Explanation of Signs] 2 photocoupler, 3 dimming control voltage generating circuit, 4 rectifying / smoothing circuit, 5 voltage dividing circuit, 6 dimming lower limit setting circuit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 次田 和彦 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 (72)発明者 小林 徹也 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 (72)発明者 小川 勇 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 (72)発明者 柴田 浩治 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 (72)発明者 西川 弘明 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 (72)発明者 北村 尚起 神奈川県鎌倉市大船二丁目14番40号 三菱 電機照明株式会社内 Ｆターム(参考） 3K072 AA01 HA10 3K098 CC40 CC49 DD35 EE05 EE06 EE32 FF04 GG01 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhiko Sugita Mitsubishi 14-14, Ofuna 2-chome, Kamakura City, Kanagawa Prefecture Electric Lighting Co., Ltd. (72) Inventor Tetsuya Kobayashi Mitsubishi 14-14, Ofuna 2-chome, Kamakura City, Kanagawa Prefecture Electric Lighting Co., Ltd. (72) Inventor Isamu Ogawa Mitsubishi 14-14, Ofuna 2-chome, Kamakura City, Kanagawa Prefecture Electric Lighting Co., Ltd. (72) Inventor Koji Shibata Mitsubishi 14-14, Ofuna 2-chome, Kamakura City, Kanagawa Prefecture Electric Lighting Co., Ltd. (72) Inventor Hiroaki Nishikawa Mitsubishi 14-14, Ofuna 2-chome, Kamakura City, Kanagawa Prefecture Electric Lighting Co., Ltd. (72) Inventor Naoki Kitamura Mitsubishi 14-14, Ofuna 2-chome, Kamakura City, Kanagawa Prefecture Electric Lighting Co., Ltd. F term (reference) 3K072 AA01 HA10 3K098 CC40 CC49 DD35 EE05 EE06 EE32 FF04 GG01
Claims (1)
と、この調光コントローラから出力される調光信号に基
づき複数の放電灯を調光する複数の放電灯点灯装置を備
えた照明システムであって、 前記複数の放電灯点灯装置それぞれは、 直流電圧を高周波電圧に変換するインバータ回路と、 このインバータ回路から発生する高周波電圧を放電灯に
供給する負荷回路と、 前記調光信号のパルス幅が大きくなるに従って電圧値が
低下する直流電圧を生成し、この直流電圧を放電灯の調
光の制御電圧として前記インバータ回路側に出力する同
じ特性の調光制御電圧生成手段と、 互いに異なる下限制御電圧を生成し、前記制御電圧がそ
の下限制御電圧よりも低下したときに前記下限制御電圧
を前記インバータ回路側に出力する調光下限設定手段と
を備えたことを特徴とする照明システム。1. A dimming controller for outputting a dimming signal and a plurality of discharge lamp lighting devices for dimming a plurality of discharge lamps based on a dimming signal output from the dimming controller. A lighting circuit comprising: an inverter circuit for converting a DC voltage to a high-frequency voltage; a load circuit for supplying a high-frequency voltage generated from the inverter circuit to the discharge lamp; A dimming control voltage generating means of the same characteristic, which generates a DC voltage whose voltage value decreases as the pulse width of the optical signal increases, and outputs the DC voltage to the inverter circuit as a dimming control voltage of the discharge lamp; Dimming that generates different lower limit control voltages and outputs the lower limit control voltage to the inverter circuit side when the control voltage falls below the lower limit control voltage A lighting system comprising: a lower limit setting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003117897A JP3829286B2 (en) | 2003-04-23 | 2003-04-23 | Lighting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003117897A JP3829286B2 (en) | 2003-04-23 | 2003-04-23 | Lighting system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000052986A Division JP2001244095A (en) | 2000-02-29 | 2000-02-29 | Lighting device of discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003317993A true JP2003317993A (en) | 2003-11-07 |
| JP3829286B2 JP3829286B2 (en) | 2006-10-04 |
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ID=29546112
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003117897A Expired - Fee Related JP3829286B2 (en) | 2003-04-23 | 2003-04-23 | Lighting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007095392A (en) * | 2005-09-27 | 2007-04-12 | Matsushita Electric Works Ltd | Discharge lamp lighting device, luminaire and illumination system |
-
2003
- 2003-04-23 JP JP2003117897A patent/JP3829286B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007095392A (en) * | 2005-09-27 | 2007-04-12 | Matsushita Electric Works Ltd | Discharge lamp lighting device, luminaire and illumination system |
| JP4501829B2 (en) * | 2005-09-27 | 2010-07-14 | パナソニック電工株式会社 | Discharge lamp lighting device, lighting fixture, and lighting system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3829286B2 (en) | 2006-10-04 |
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