JPH033357B2 - - Google Patents
Info
- Publication number
- JPH033357B2 JPH033357B2 JP18227183A JP18227183A JPH033357B2 JP H033357 B2 JPH033357 B2 JP H033357B2 JP 18227183 A JP18227183 A JP 18227183A JP 18227183 A JP18227183 A JP 18227183A JP H033357 B2 JPH033357 B2 JP H033357B2
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamps
- power supply
- supply device
- cold cathode
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 21
- 238000011895 specific detection Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は複数個の冷陰極放電灯を並列点灯する
冷陰極放電灯点灯装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold cathode discharge lamp lighting device for lighting a plurality of cold cathode discharge lamps in parallel.
冷陰極放電灯（以下放電灯という）は、一般に
ランプ電流が小さく、したがつて、定格点灯まで
かなりの時間を要する。このような放電灯をたと
えば複写機用として複数個を並列点灯すると、各
放電灯の立上り時の光出力にアンバランスが生
じ、所定の光出力を得難いという問題があつた。 Cold cathode discharge lamps (hereinafter referred to as discharge lamps) generally have a small lamp current, and therefore require a considerable amount of time to reach their rated lighting. When a plurality of such discharge lamps are lit in parallel for use in a copying machine, for example, there is a problem that an imbalance occurs in the light output of each discharge lamp at the time of startup, making it difficult to obtain a predetermined light output.
本発明は、このような問題を解消するためにな
されたもので、並列点灯する複数個の放電灯個々
のランプ電流の一定化を図り、もつて、所定の光
出力を得られる冷陰極放電灯点灯装置を提供する
ことを目的とするものである。 The present invention has been made to solve these problems, and provides a cold cathode discharge lamp that stabilizes the lamp current of each of a plurality of discharge lamps that are lit in parallel, thereby obtaining a predetermined light output. The object of the present invention is to provide a lighting device.
本発明は複数個の放電灯を並列点灯し、各放電
灯のランプ電流検出装置を複数個設けるととも
に、これら検出装置の検出信号をオワ回路を介し
て制御装置に入力し、すべての放電灯が点灯して
いるときには特定の検出信号に応じて付勢用の電
源装置を定電流制御することを特徴とするもので
ある。 In the present invention, a plurality of discharge lamps are lit in parallel, a plurality of lamp current detection devices are provided for each discharge lamp, and detection signals from these detection devices are inputted to a control device via an ON/OFF circuit. When the light is on, the energizing power supply device is subjected to constant current control in accordance with a specific detection signal.
本発明において、付勢用の電源装置はたとえば
インバータ等の高周波電源装置とすることができ
る。この場合、電源装置を電子化して小形にでき
るとともに、フリツカ、ストロボ効果を解決でき
る。しかし、電源装置は商用周波等の低波電源で
もよいものである。 In the present invention, the energizing power supply device can be, for example, a high frequency power supply device such as an inverter. In this case, the power supply device can be electronicized and made smaller, and flicker and strobe effects can be solved. However, the power supply device may be a low wave power source such as a commercial frequency power source.
また、本発明において、制御装置はインバータ
等のスイツチング周波数を制御するものであつた
り、位相制御するものであつたり、ドロツパを制
御したりするもの等、電源装置を制御できるもの
であればよいものである。 Further, in the present invention, the control device may be any device that can control the power supply device, such as one that controls the switching frequency of an inverter or the like, one that controls the phase, or one that controls a dropper. It is.
以下、本発明の一実施例を図を参照して説明す
る。１，２は冷陰極放電灯で互いに並列的に設け
られている。３，４はバラストたとえば抵抗であ
る。５は前記放電灯１，２を付勢する電源装置で
ある。本実施例では20kHz〜50kHzの高周波電圧
を出力するインバータであり、発振部６、トラン
ス７直流電源８からなる。９，１０は前記各放電
灯１，２に対応して設けられた電流検出装置であ
る。１１は制御装置で、前記各検出装置９，１０
の検出信号をオワ回路１２を介して入する。そし
て、前記各放電灯１，２がともに点灯している常
時においては特定の検出信号たとえば検出装置９
の検出信号に応じて、前記電源装置５を定電流制
御するものである。このような制御装置１１は周
知のもので構成することができ、本実施例では比
較装置１３を用いて構成している。１４は基準信
号源である。なお、前記特定の検出信号を決定す
るには、たとえば検出信号に大小の差が生じるよ
うに予め設定しておくことによつて行なえる。 An embodiment of the present invention will be described below with reference to the drawings. Cold cathode discharge lamps 1 and 2 are provided in parallel with each other. 3 and 4 are ballasts, such as resistors. Reference numeral 5 denotes a power supply device that energizes the discharge lamps 1 and 2. In this embodiment, it is an inverter that outputs a high frequency voltage of 20 kHz to 50 kHz, and is composed of an oscillating section 6, a transformer 7, and a DC power source 8. Reference numerals 9 and 10 are current detection devices provided corresponding to each of the discharge lamps 1 and 2. 11 is a control device, each of the detection devices 9 and 10;
The detection signal is inputted via the output circuit 12. When both of the discharge lamps 1 and 2 are on, a specific detection signal such as a detection device 9 is sent.
According to the detection signal, the power supply device 5 is controlled to have a constant current. Such a control device 11 can be configured using a well-known device, and in this embodiment, it is configured using a comparison device 13. 14 is a reference signal source. Note that the specific detection signal can be determined by, for example, setting in advance so that a difference in magnitude occurs between the detection signals.
つぎに作用を述べる。まず、放電灯１，２がと
もに点灯しているときには、検出装置９の検出信
号に応じて電源装置５が定電流制御され、放電灯
１は所定の光を出力する。また、電源装置５は放
電灯１のランプ電流が一定となるように制御され
ているのであるから、同一電源装置５から付勢さ
れる放電灯２のランプ電流もほぼ一定となる。つ
ぎに、放電灯１が破損したり、取外されたりする
と、今度は検出装置１０の検出信号に応じて電源
装置５が制御される。したがつて、放電灯２に対
して無制御となつて暴走するようなことはない。
３個以上の放電灯を点灯する場合も同様である。 Next, we will discuss the effect. First, when the discharge lamps 1 and 2 are both lit, the power supply device 5 is controlled to have a constant current according to the detection signal from the detection device 9, and the discharge lamp 1 outputs a predetermined light. Furthermore, since the power supply device 5 is controlled so that the lamp current of the discharge lamp 1 is constant, the lamp current of the discharge lamp 2 energized by the same power supply device 5 is also approximately constant. Next, when the discharge lamp 1 is damaged or removed, the power supply device 5 is controlled according to the detection signal from the detection device 10. Therefore, the discharge lamp 2 will not become uncontrolled and run out of control.
The same applies when lighting three or more discharge lamps.
以上詳述したように本発明は、複数個の冷陰極
放電灯を並列点灯し、各放電灯に対応して複数個
の電流検出装置を設けるとともに、これら検出装
置の検出信号をオワ回路を介して制御装置に入力
し、すべての放電灯が点灯しているときには特定
の検出信号に応じて付勢用の電源装置を定電流制
御するようにしたから、すべての放電灯が点灯し
ているときには各放電灯のランプ電流を一定化し
て所定の光出力を得ることができ、一個特に特定
の検出信号に対応した放電灯が不点になつても、
他の放電灯が暴走するようなことがないものであ
る。 As described in detail above, the present invention involves lighting a plurality of cold cathode discharge lamps in parallel, providing a plurality of current detection devices corresponding to each discharge lamp, and transmitting the detection signals of these detection devices through an O/O circuit. When all discharge lamps are lit, the energizing power supply unit is controlled with constant current according to a specific detection signal, so when all discharge lamps are lit, It is possible to obtain a predetermined light output by making the lamp current of each discharge lamp constant, and even if one discharge lamp that corresponds to a particular detection signal malfunctions,
This prevents other discharge lamps from going out of control.
図は本発明の一実施例を示す回路図である。
１，２……冷陰極放電灯、５……電源装置、
９，１０……電流検出装置、１１……制御装置、
１２……オワ回路。
The figure is a circuit diagram showing one embodiment of the present invention. 1, 2...cold cathode discharge lamp, 5...power supply device,
9, 10... Current detection device, 11... Control device,
12...Oh circuit.
Claims (1)
電灯と、これら各放電灯を付勢する電源装置と、 上記各放電灯それぞれに対応して設けられた複
数個のランプ電流検出装置と、 上記各ランプ電流検出装置の検出信号をオワ回
路を介して入力するとともに、上記複数個の放電
灯が点灯しているときには特定の検出信号に応じ
て上記電源装置を定電流制御する制御装置と、 を具備したことを特徴とする冷陰極放電灯点灯装
置。[Claims] 1. A plurality of cold cathode discharge lamps provided in parallel with each other, a power supply device for energizing each of these discharge lamps, and a plurality of cold cathode discharge lamps provided corresponding to each of the discharge lamps. The detection signals of the lamp current detection device and each of the lamp current detection devices are inputted through the ON/OFF circuit, and when the plurality of discharge lamps are lit, the power supply device is operated at a constant current according to a specific detection signal. A cold cathode discharge lamp lighting device comprising: a control device for controlling;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18227183A JPS6074391A (en) | 1983-09-30 | 1983-09-30 | Device for firing cold-cathode discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18227183A JPS6074391A (en) | 1983-09-30 | 1983-09-30 | Device for firing cold-cathode discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6074391A JPS6074391A (en) | 1985-04-26 |
| JPH033357B2 true JPH033357B2 (en) | 1991-01-18 |
Family
ID=16115341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18227183A Granted JPS6074391A (en) | 1983-09-30 | 1983-09-30 | Device for firing cold-cathode discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6074391A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2514146Y2 (en) * | 1987-07-28 | 1996-10-16 | 松下電工株式会社 | Inverter device |
-
1983
- 1983-09-30 JP JP18227183A patent/JPS6074391A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6074391A (en) | 1985-04-26 |
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