JPH038554B2 - - Google Patents
Info
- Publication number
- JPH038554B2 JPH038554B2 JP57188498A JP18849882A JPH038554B2 JP H038554 B2 JPH038554 B2 JP H038554B2 JP 57188498 A JP57188498 A JP 57188498A JP 18849882 A JP18849882 A JP 18849882A JP H038554 B2 JPH038554 B2 JP H038554B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent display
- display tube
- transistor
- switching element
- pulse
- 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
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
【発明の詳細な説明】 この発明は、螢光表示管の駆動装置に関する。[Detailed description of the invention] The present invention relates to a driving device for a fluorescent display tube.
卓上計算機等のデータ表示に用いられる螢光表
示管は、動作中に電極間に電荷が蓄積されるの
で、その駆動装置には、それを消灯後に放電させ
るための放電抵抗が設置されている。 Fluorescent display tubes used for displaying data in desk-top calculators and the like accumulate electric charge between electrodes during operation, so a discharge resistor is installed in the drive device to discharge the electric charge after the lamp is turned off.
ところが、放電抵抗は、消灯時の残留電荷の放
電に必要とされるにも拘わらず、点灯中には、そ
れ自体が電力消費の原因になる。そこで、このよ
うな放電抵抗による電力消費を抑制するため、放
電抵抗に代えて定電流回路を用いて放電回路を構
成した駆動装置が提案され、第１図はその螢光表
示管の駆動装置を示す。 However, although the discharge resistor is required to discharge residual charge when the lamp is turned off, it itself becomes a cause of power consumption when the lamp is turned on. Therefore, in order to suppress power consumption due to such a discharge resistor, a drive device was proposed in which the discharge circuit was constructed using a constant current circuit instead of the discharge resistor. Figure 1 shows the drive device for a fluorescent display tube. show.
この駆動装置において、２，４は直流電源ライ
ンであり、この直流電源ライン２には正電源、直
流電源ライン４には負電源が供給される。直流電
源ライン２には定電圧ダイオード６を介してスイ
ツチング素子としてのトランジスタ８のエミツタ
が接続され、このトランジスタ８のコレクタには
螢光表示管１０のアノードが接続されている。ト
ランジスタ８のベースは螢光表示管１０を点灯さ
せるための点灯信号を与える点灯入力端子１２に
接続されている。 In this drive device, reference numerals 2 and 4 are DC power lines, the DC power line 2 is supplied with a positive power, and the DC power line 4 is supplied with a negative power. The emitter of a transistor 8 as a switching element is connected to the DC power supply line 2 via a constant voltage diode 6, and the collector of this transistor 8 is connected to the anode of a fluorescent display tube 10. The base of the transistor 8 is connected to a lighting input terminal 12 which provides a lighting signal for lighting the fluorescent display tube 10.
螢光表示管１０のカソード電極を兼用するフイ
ラメントには、フイラメント加熱用のトランス１
４の２次コイルが接続され、このトランス１４の
１次コイルには電圧印加端子１６，１８を通して
フイラメント加熱用電源が供給される。そして、
トランス１４の２次コイルの中間タツプと、直流
電源ライン４との間には、定電圧ダイオード２
０，２２が直列に挿入されている。 The filament, which also serves as the cathode electrode of the fluorescent display tube 10, is equipped with a transformer 1 for heating the filament.
A secondary coil of No. 4 is connected to the transformer 14, and power for heating the filament is supplied to the primary coil of the transformer 14 through voltage application terminals 16 and 18. and,
A constant voltage diode 2 is connected between the intermediate tap of the secondary coil of the transformer 14 and the DC power supply line 4.
0 and 22 are inserted in series.
また、螢光表示管１０のアノードと直流電源ラ
イン４との間には、消灯時の残留電荷を放電する
ために放電回路としてトランジスタ２４及び抵抗
２６が接続され、トランジスタ２４のベースは抵
抗２８を介して定電圧ダイオート２０，２２の間
に接続されている。即ち、トランジスタ２４及び
抵抗２６は定電流回路を構成し、トランジスタ２
４のベース電位は定電圧ダイオード２０，２２の
螢光電圧で確保され、トランジスタ２４は常に動
作状態に置かれている。 Further, a transistor 24 and a resistor 26 are connected as a discharge circuit between the anode of the fluorescent display tube 10 and the DC power supply line 4 to discharge residual charge when the light is turned off.The base of the transistor 24 is connected to a resistor 28. It is connected between the constant voltage diodes 20 and 22 via the constant voltage diode 20 and 22. That is, the transistor 24 and the resistor 26 constitute a constant current circuit, and the transistor 24 and the resistor 26 constitute a constant current circuit.
The base potential of transistor 4 is secured by the fluorescent voltage of voltage regulator diodes 20 and 22, and transistor 24 is always kept in an operating state.
このような駆動装置では、放電抵抗を用いた場
合に比較して電力消費を大幅に削減することがで
きるが、定電流回路を構成するトランジスタ２４
及び抵抗２６に常に電流が流れるので、依然とし
て電力消費が発生し、しかも、螢光表示管１０の
点灯及び消灯がトランジスタ２４に応動して行わ
れ、残留電荷の放電に時間を要するため、消灯が
遅くなる等の欠点がある。 In such a drive device, power consumption can be significantly reduced compared to the case where a discharge resistor is used, but the transistor 24 that constitutes the constant current circuit
Since current always flows through the resistor 26 and the resistor 26, power consumption still occurs.Furthermore, the fluorescent display tube 10 is turned on and off in response to the transistor 24, and it takes time to discharge the residual charge, so it is difficult to turn off the light. It has drawbacks such as being slow.
そこで、この発明は、点灯及び消灯を迅速にし
た螢光表示管の駆動装置の提供を目的とする。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a driving device for a fluorescent display tube that can quickly turn on and off.
即ち、この発明の螢光表示管の駆動装置は、電
源と螢光表示管のアノードとの間に直列に接続さ
れ、かつ、点灯パルスによつて導通して前記螢光
表示管に駆動電流を流す第１のスイツチング素子
（トランジスタ８）と、消灯パルスによつて導通
して前記螢光表示管のアノードに放電回路を成
し、消灯時、前記螢光表示管の残留電荷を放電さ
せる第２のスイツチング素子（トランジスタ３
０）と、前記第１のスイツチング素子の導通区間
で充電され、前記点灯パルスが解除された後、前
記消灯パルスによつて前記第２のスイツチング素
子が導通するまでの区間でその充電電圧を前記螢
光表示管のアノードに加え、前記螢光表示管を点
灯状態に保持させるコンデンサ３６とから構成し
たものである。 That is, the fluorescent display tube driving device of the present invention is connected in series between a power source and an anode of the fluorescent display tube, and conducts by a lighting pulse to supply a driving current to the fluorescent display tube. a first switching element (transistor 8) that conducts the current, and a second switching element (transistor 8) that is electrically connected by the extinguishing pulse to form a discharge circuit to the anode of the fluorescent display tube, and discharges the residual charge of the fluorescent display tube when the light is turned off. switching element (transistor 3
0), the first switching element is charged in the conduction period, and after the lighting pulse is released, the charging voltage is changed to In addition to the anode of the fluorescent display tube, it is composed of a capacitor 36 for keeping the fluorescent display tube in a lit state.
以下、この発明を図面に示した実施例を参照し
て詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
第２図はこの発明の螢光表示管の駆動装置の実
施例を示し、第１図の回路と同一部分には同一符
号が付してある。 FIG. 2 shows an embodiment of a fluorescent display tube driving device according to the present invention, and the same parts as the circuit of FIG. 1 are given the same reference numerals.
この駆動装置では、直流電源ライン２の螢光表
示管１０のアノードとの間に定電圧ダイオード６
とともに第１のスイツチング素子としてのトラン
ジスタ８が設置され、このトランジスタ８は、ベ
ースに点灯入力端子１２を通して点灯パルスが加
えられ、その点灯パルスによつて導通する。 In this drive device, a constant voltage diode 6 is connected between the DC power supply line 2 and the anode of the fluorescent display tube 10.
A transistor 8 as a first switching element is also provided, and a lighting pulse is applied to the base of the transistor 8 through a lighting input terminal 12, and the transistor 8 is made conductive by the lighting pulse.
また、螢光表示管１０のアノードと直流電源ラ
イン４との間には、消灯時、螢光表示管１０の残
留電荷を放電するための放電回路を成す第２のス
イツチング素子としてのトランジスタ３０ととも
に抵抗３２が接続されている。トランジスタ３０
は、ベースに消灯入力端子３４を通して消灯パル
スが加えられることにより導通する。 Further, between the anode of the fluorescent display tube 10 and the DC power supply line 4, there is a transistor 30 as a second switching element forming a discharge circuit for discharging the residual charge of the fluorescent display tube 10 when the light is turned off. A resistor 32 is connected. transistor 30
becomes conductive when a light-off pulse is applied to the base through the light-off input terminal 34.
そして、トランジスタ３０のコレクタには、ト
ランジスタ８の導通時、充電されるコンデンサ３
６が接続されている。 A capacitor 3 is connected to the collector of the transistor 30 and is charged when the transistor 8 is conductive.
6 is connected.
以上の構成において、その動作を第３図を参照
して説明する。 The operation of the above configuration will be explained with reference to FIG.
電圧印加端子１６，１８の間にフイラメント加
熱用の電源が供給されると、螢光表示管１０のフ
イラメントが加熱される。第３図のＡは点灯パル
ス、第３図のＢは消灯パルスを示し、図示しない
制御部のマイクロコンピユータ等で形成されるも
のとする。 When a power source for heating the filament is supplied between the voltage application terminals 16 and 18, the filament of the fluorescent display tube 10 is heated. A in FIG. 3 indicates a lighting pulse, and B in FIG. 3 indicates a light-off pulse, which are formed by a microcomputer or the like in a control section (not shown).
第３図のＡに示す点灯パルスが点灯入力端子１
２に加えられると、その低（Ｌ）レベルの区間t1
において、トランジスタ８が導通状態となり、ト
ランジスタ８を通じて螢光表示管１０に駆動電流
が流れ、螢光表示管１０は点灯する。 The lighting pulse shown at A in Figure 3 is the lighting input terminal 1.
2, its low (L) level interval t 1
At this time, the transistor 8 becomes conductive, a driving current flows through the transistor 8 to the fluorescent display tube 10, and the fluorescent display tube 10 lights up.
このトランジスタ８が導通する区間t1におい
て、コンデンサ３６はトランジスタ８を通じて一
定の電圧に充電される。このため、点灯パルスが
解除されると、トランジスタ８が遮断状態とな
り、トランジスタ８からの駆動電流は解除される
が、螢光表示管１０のアノードにはコンデンサ３
６の充電電圧が加えられる。このため、螢光表示
管１０は、トランジスタ８を通じての駆動電流に
代わつてコンデンサ３６の充電電圧によつて駆動
電流が供給され、点灯パルスが解除された後も点
灯を持続する。 In the interval t 1 in which the transistor 8 is conductive, the capacitor 36 is charged to a constant voltage through the transistor 8 . Therefore, when the lighting pulse is released, the transistor 8 is cut off and the drive current from the transistor 8 is released, but the capacitor 3 is connected to the anode of the fluorescent display tube 10.
A charging voltage of 6 is applied. Therefore, the fluorescent display tube 10 is supplied with a driving current by the charging voltage of the capacitor 36 instead of the driving current through the transistor 8, and continues to be lit even after the lighting pulse is released.
次に、消灯入力端子３４に第３図のＢに示す消
灯パルスが加わると、この高（Ｈ）レベルの区間
t2でトランジスタ３０が導通状態になり、このと
き、螢光表示管１０のアノードにはトランジスタ
３０及び抵抗３２からなる放電回路が形成される
ことになる。この結果、この放電回路を通じて螢
光表示管１０の残留電荷が放電されるとともに、
コンデンサ３６の電荷も瞬間に直流電源ライン４
に放電される。 Next, when a light-off pulse shown in B in FIG. 3 is applied to the light-off input terminal 34, this high (H) level section
At t2 , the transistor 30 becomes conductive, and at this time, a discharge circuit consisting of the transistor 30 and the resistor 32 is formed at the anode of the fluorescent display tube 10. As a result, the residual charge in the fluorescent display tube 10 is discharged through this discharge circuit, and
The charge on the capacitor 36 is also instantly transferred to the DC power supply line 4.
is discharged.
したがつて、コンデンサ３６の充電電圧は、第
３図のＣに示すように、区間t3で減衰する電圧と
なり、螢光表示管１０は、点灯パルスによつて点
灯を開始し、その点灯パルスの解除後は、消灯パ
ルスが到来するまでの区間t3でコンデンサ３６の
充電電圧によつて点灯を持続し、消灯パルスの到
来で瞬時に消灯する。 Therefore, the charging voltage of the capacitor 36 becomes a voltage that attenuates in the interval t3, as shown in C in FIG. 3 , and the fluorescent display tube 10 starts lighting with the lighting pulse. After the release of , the lighting is continued by the charging voltage of the capacitor 36 in the interval t 3 until the arrival of the lights-off pulse, and the light is instantly turned off when the lights-off pulse arrives.
このようにトランジスタ３０は点灯時に不導通
状態を維持し、消灯時のみ導通状態に置かれるた
め、トランジスタ３０には従来の回路のような電
流が流れることはなく、電力消費の消減とともに
残留電荷が瞬時に放電できる結果、消灯を瞬時に
行うことができ、また、点灯時にもトランジスタ
３０には電流が流れないため、点灯も迅速化す
る。さらに、コンデンサ３６の充電電圧を用いて
螢光表示管１０を点灯させるので、点灯及び消灯
の迅速化とともに、省電力化が図られる。 In this way, the transistor 30 maintains a non-conducting state when the light is on and is placed in a conductive state only when the light is off, so that unlike conventional circuits, no current flows through the transistor 30, and as the power consumption is reduced, residual charge is removed. As a result of instantaneous discharge, the light can be turned off instantly, and since no current flows through the transistor 30 even when the transistor 30 is turned on, the light can be turned on quickly. Furthermore, since the fluorescent display tube 10 is turned on using the charging voltage of the capacitor 36, it is possible to turn on and off the light more quickly and to save power.
以上説明したように、この発明によれば、点灯
時、点灯パルスに応動して第１のスイツチング素
子を導通させて螢光表示管に駆動電流を流すとと
もに、その導通区間でコンデンサを充電させ、点
灯パルスの解除による第１のスイツチング素子の
遮断から消灯パルスの到来による第２のスイツチ
ング素子の導通に至る区間に前記コンデンサの充
電電荷を以て螢光表示管を点灯させ、消灯時、第
２のスイツチング素子の導通によつて螢光表示管
のアノードに放電回路を形成して螢光表示管の残
留電荷を放電させるので、点灯パルス及び消灯パ
ルスに幅の狭いパルスを用いて点灯及び消灯を行
い、かつ、残留電荷の瞬時放電ができ、しかも、
点灯時、コンデンサを用いて点灯を維持させるの
で、点灯及び消灯の迅速化とともに省電力化を図
ることができる。 As explained above, according to the present invention, during lighting, the first switching element is made conductive in response to the lighting pulse to flow a driving current to the fluorescent display tube, and the capacitor is charged in the conductive section. The fluorescent display tube is lit using the charge stored in the capacitor during the period from the first switching element being cut off by the release of the lighting pulse to the second switching element being turned on by the arrival of the lighting pulse, and when the lighting is turned off, the second switching element is turned on. A discharge circuit is formed at the anode of the fluorescent display tube by the conduction of the element, and the residual charge in the fluorescent display tube is discharged, so narrow pulses are used for the lighting and extinguishing pulses to turn on and off the light. In addition, the residual charge can be instantly discharged, and
When the lamp is turned on, a capacitor is used to maintain the lamp, so it is possible to turn on and off the lamp more quickly and to save power.
第１図は螢光表示管の従来の駆動装置を示す回
路図、第２図はこの発明の螢光表示管の駆動装置
の実施例を示す回路図、第３図は第２図に示した
螢光表示管の駆動装置の動作波形を示す説明図で
ある。
８……トランジスタ（第１のスイツチング素
子）、１０……螢光表示管、３０……トランジス
タ（第２のスイツチング素子）、３６……コンデ
ンサ。
FIG. 1 is a circuit diagram showing a conventional driving device for a fluorescent display tube, FIG. 2 is a circuit diagram showing an embodiment of the driving device for a fluorescent display tube according to the present invention, and FIG. 3 is a circuit diagram showing a conventional driving device for a fluorescent display tube. FIG. 3 is an explanatory diagram showing operation waveforms of a driving device for a fluorescent display tube. 8...Transistor (first switching element), 10...Fluorescent display tube, 30...Transistor (second switching element), 36...Capacitor.
Claims (1)
接続され、かつ、点灯パルスによつて導通して前
記螢光表示管に駆動電流を流す第１のスイツチン
グ素子と、 消灯パルスによつて導通して前記螢光表示管の
アノードに放電回路を成し、消灯時、前記螢光表
示管の残留電荷を放電させる第２のスイツチング
素子と、 前記第１のスイツチング素子の導通区間で充電
され、前記点灯パルスが解除された後、前記消灯
パルスによつて前記第２のスイツチング素子が導
通するまでの区間でその充電電圧を前記螢光表示
管のアノードに加え、前記螢光表示管を点灯状態
に保持させるコンデンサとから構成したことを特
徴とする螢光表示管の駆動装置。[Scope of Claims] 1. A first switching element connected in series between a power source and an anode of a fluorescent display tube, and conductive in response to a lighting pulse to flow a driving current to the fluorescent display tube. , a second switching element that is electrically connected by the extinguishing pulse to form a discharge circuit to the anode of the fluorescent display tube, and discharges residual charge in the fluorescent display tube when the light is extinguished; and the first switching element. After the lighting pulse is released, the charging voltage is applied to the anode of the fluorescent display tube during the period until the second switching element becomes conductive due to the extinction pulse. 1. A driving device for a fluorescent display tube, comprising a capacitor for keeping the fluorescent display tube in a lit state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18849882A JPS5978393A (en) | 1982-10-27 | 1982-10-27 | Driver for fluorescent indicator tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18849882A JPS5978393A (en) | 1982-10-27 | 1982-10-27 | Driver for fluorescent indicator tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5978393A JPS5978393A (en) | 1984-05-07 |
| JPH038554B2 true JPH038554B2 (en) | 1991-02-06 |
Family
ID=16224776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18849882A Granted JPS5978393A (en) | 1982-10-27 | 1982-10-27 | Driver for fluorescent indicator tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5978393A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62161292U (en) * | 1986-04-03 | 1987-10-14 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53110561A (en) * | 1977-03-08 | 1978-09-27 | Citizen Watch Co Ltd | Lighting device of electronic watches |
| JPS5856036B2 (en) * | 1976-09-06 | 1983-12-13 | 三洋電機株式会社 | Water splitting device using light energy |
-
1982
- 1982-10-27 JP JP18849882A patent/JPS5978393A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5978393A (en) | 1984-05-07 |
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