JPS5838462Y2 - Light emitting diode display circuit device - Google Patents
Light emitting diode display circuit deviceInfo
- Publication number
- JPS5838462Y2 JPS5838462Y2 JP1979013417U JP1341779U JPS5838462Y2 JP S5838462 Y2 JPS5838462 Y2 JP S5838462Y2 JP 1979013417 U JP1979013417 U JP 1979013417U JP 1341779 U JP1341779 U JP 1341779U JP S5838462 Y2 JPS5838462 Y2 JP S5838462Y2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting diode
- diode
- switch
- inspection
- 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
Links
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- Audible And Visible Signals (AREA)
Description
【考案の詳細な説明】
本考案は発光ダイオードがサージによシ破壊されるのを
防止するようにした発光ダイオードの表示回路装置に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light emitting diode display circuit device that prevents light emitting diodes from being destroyed by surges.
第１図〜第３図は従来より使用されている発光ダイオー
ド表示回路である。1 to 3 show conventionally used light emitting diode display circuits.
第１図の回路は接点Ｆが閉路すると発光ダイオードＬＥ
Ｄが発光表示する回路で、Ｒは発光ダイオードに流れる
電流を制限する電流制限抵抗で、Ｐ、Ｎは電源である。In the circuit shown in Figure 1, when contact F is closed, the light emitting diode LE
D is a circuit for light emitting display, R is a current limiting resistor that limits the current flowing to the light emitting diode, and P and N are power supplies.
第１図で接点Ｆが閉路している時電源Ｐ側から実線矢印
の如くサージが進入した場合は、発光ダイオードＬＥＤ
からみて順方向となる為発光ダイオードが破壊すること
はほとんどない。In Figure 1, if a surge enters from the power supply P side as shown by the solid arrow while contact F is closed, the light emitting diode LED
Since the light is in the forward direction when viewed from above, it is unlikely that the light emitting diode will be destroyed.
しかし電源Ｎ側から点検矢印の如くサージが進入した場
合は発光ダイオードＬＥＤに逆向きに加わる。However, if a surge enters from the power supply N side as shown by the inspection arrow, it will be applied to the light emitting diode LED in the opposite direction.
発光ダイオードＬＥＤは通常逆電圧の耐力は５Ｖ程度で
あり、これ以上のサージが進入すると破壊する。Light emitting diodes (LEDs) usually have a reverse voltage resistance of about 5V, and will be destroyed if a surge of more than this enters.
そこで通常は第２図のような表示回路を構成している。Therefore, a display circuit as shown in FIG. 2 is usually constructed.
第２図は発光ダイオードＬＥＤと並列にダイオードＤを
接続している。In FIG. 2, a diode D is connected in parallel with the light emitting diode LED.
この回路であると、電源Ｎ側からのサージが点線矢印の
如く進入してきてもダイオードＤを通してサージ電流が
流れ、発光ダイオードＬＥＤに加わる逆電圧はサージ電
流によるダイオードの順電圧外だけなので発光ダイオー
ドＬＥＤが破壊することはない。With this circuit, even if a surge from the power supply N side enters as shown by the dotted arrow, the surge current will flow through the diode D, and the reverse voltage applied to the light emitting diode LED is only outside the forward voltage of the diode due to the surge current, so the light emitting diode LED will not destroy it.
第３図は第２図の回路がｎ個となりそれに発光ダイオー
ドＬＥＤの点検回路が附加された回路である。FIG. 3 shows a circuit in which n circuits of FIG. 2 are added and a light emitting diode LED inspection circuit is added to the n circuits.
第３図でＬＥＤ １−ＬＥＤ ｎは発光ダイオード、Ｒ
１−Ｒｎは電流制限抵抗、Ｆｌ−Ｆｎは発光ダイオード
を表示するための接点、Ｄｌ−Ｄｎは発光ダイオードを
保護するためのダイオード、Ｄｔｌ〜Ｄｔｎは発光ダイ
オード点検時の周り込み防止用ダイオード、３０Ｔは発
光ダイオード点検スイッチである。In Figure 3, LED 1-LED n are light emitting diodes, R
1-Rn is a current limiting resistor, Fl-Fn is a contact for displaying the light-emitting diode, Dl-Dn is a diode for protecting the light-emitting diode, Dtl to Dtn are diodes for preventing wrap-around when inspecting the light-emitting diode, 30T is a light emitting diode inspection switch.
一般にはこの第３図が使用されており、発光ダイオード
の数に比例して、発光ダイオード保護用のダイオードと
、点検時の周り込み防止用ダイオードを設けなければな
らないため組立配線の工数が増えるという欠点がある。Generally, Figure 3 is used, and as the number of light emitting diodes increases, the number of assembly and wiring steps increases because diodes to protect the light emitting diodes and diodes to prevent people from entering during inspection must be installed. There are drawbacks.
本考案は発光ダイオードの保護を、点検時の周り込み防
止用ダイオードを利用することにより１（Ｆ）ダイオー
ド追加で済むようにした発光ダイオード表示回路を提供
することを目的とする。An object of the present invention is to provide a light emitting diode display circuit in which the light emitting diode can be protected by using a diode for preventing encirclement during inspection, so that only one (F) diode is required.
以下本考案を第４図に示す実施例について説明する。The present invention will be described below with reference to an embodiment shown in FIG.
第４図においてＬＥＩｈ−ＬＥＤＩＩは夫々発光ダイオ
ードで電流制限抵抗Ｒ１〜Ｒｎおよび発光ダイオード表
示接点Ｆｌ−ＦＨを介して電源母線Ｐ、Ｎ間に接続され
ている。In FIG. 4, LEIh-LEDII are light emitting diodes connected between power supply buses P and N via current limiting resistors R1-Rn and light-emitting diode display contacts Fl-FH.
前記発光ダイオードＬＥＤ １抵抗Ｒ１の直列回路に対
して保護用ダイオードＤおよび点検時の回り込み防止用
ダイオードＤｔｘから成る直列回路を逆並列接続する。A series circuit consisting of a protection diode D and a diode Dtx for preventing leakage during inspection is connected in antiparallel to the series circuit of the light emitting diode LED 1 and resistor R1.
ダイオードＤとＤｔｘとの接続点をＣ１抵抗Ｒ１と接点
Ｆ１との接続点をＣ１１同様にして抵抗Ｒ２と接点Ｆ
２１ ＲｎとＦｎとの接続点を夫々Ｃ２・・・Ｃｎとす
る。The connection point between diode D and Dtx is C1, the connection point between resistor R1 and contact F1 is the same as C11, and the connection point between resistor R2 and contact F is
21 Let the connection points of Rn and Fn be C2...Cn, respectively.
これら接続点Ｃ２〜Ｃｎと接続点Ｃとの間を夫々図示極
性の点検時の回り込み防止用ダイオードＤｔ２・・・Ｄ
ｔｎで接続する。Between these connection points C2 to Cn and connection point C, there are diodes Dt2...D for preventing wraparound when inspecting the illustrated polarity, respectively.
Connect with tn.
そしてこの接続点Ｃと母線Ｎとの間を発光ダイオード点
検スイッチ３０Ｔで接続する。This connection point C and bus line N are connected by a light emitting diode inspection switch 30T.
第４図において、接点Ｆ１の閉路中、電源Ｐ側から実線
矢印の如くサージが進入した場合は発光ダイオードＬＥ
ＤＩからみて順方向となるため問題はない。In Fig. 4, if a surge enters from the power supply P side as shown by the solid arrow while the contact F1 is closed, the light emitting diode LE
There is no problem since the direction is forward as seen from DI.
発光ダイオードＬＥＤＩからみて逆方向となる電源Ｎ側
からサージが進入した場合は第４図点線矢印の如く、点
検時の周り込み防止用ダイオードＤｔｘと、保護用ダイ
オードＤを通してサージ電流が流れ、発光ダイオードＬ
ＥＤ １に加わる逆電圧はダイオードＤｔ１とＤのサー
ジ電流による順電圧弁だけとなる。If a surge enters from the power supply N side, which is the opposite direction when viewed from the light-emitting diode LEDI, the surge current will flow through the diode Dtx for preventing wrap-around during inspection and the protection diode D, as shown by the dotted line arrow in Figure 4, and the light-emitting diode will be damaged. L
The only reverse voltage applied to ED1 is the forward voltage valve due to the surge current of diodes Dt1 and D.
このダイオード２個分の順電圧は２ｖ程度であるため発
光ダイオードＬＥＤ１が破壊することはない。Since the forward voltage of these two diodes is about 2V, the light emitting diode LED1 will not be destroyed.
発光ダイオードＬ、ＥＤ２〜ＬＥＤｎについても同様で
ある。The same applies to the light emitting diodes L and ED2 to LEDn.
以上説明したように発光ダイオードの保護を点検時の周
り込み防止用ダイオードを利用することにより保護用ダ
イオードは１個で済む。As explained above, by using the diode to prevent light-emitting diodes from entering when inspecting the protection, only one protection diode is required.
第５図、第６図は他の実施例を示している。FIGS. 5 and 6 show other embodiments.
第５図は点検時の周り込み防止用ダイオードと保護用ダ
イオードが発光ダイオードと並列になるように接続した
もので、点検時に一括して電流制限抵抗Ｊを介して発光
ダイオードを表示させるものである。Figure 5 shows a diode for preventing cross-circumference and a protection diode connected in parallel with a light emitting diode during inspection, and the light emitting diode is displayed all at once via a current limiting resistor J during inspection. .
第６図は第４図の電源Ｐ、Ｎを逆にした回路で発光ダイ
オード、保護用ダイオードλ点検時の周り込み防止用ダ
イオードのカソード、アノードが逆となっているもので
ある。FIG. 6 shows a circuit in which the power supplies P and N of FIG. 4 are reversed, and the cathode and anode of the light-emitting diode and protection diode λ prevention diode used when inspecting λ are reversed.
又、本考案の説明は発光ダイオードＬＥＤ１〜ＬＥＤｎ
を発光させるスイッチとして接点を用いているが、この
スイッチをトランジスタに置換えても何ら問題はない。In addition, the explanation of the present invention is based on the light emitting diodes LED1 to LEDn.
Although a contact is used as a switch to cause the light to emit light, there is no problem in replacing this switch with a transistor.
点検用スイッチ３０Ｔについてもトランジスタスイッチ
におきかえてもよい。The inspection switch 30T may also be replaced with a transistor switch.
本考案は上述した如く、発光ダイオードの数だけダイオ
ードを設けて点検回路を構成しダイオードのコモン点Ｃ
から点検用スイッチと反対側の電源へ保護用ダイオード
を設けたため保護用ダイオードは１個で済む。As mentioned above, the present invention constructs an inspection circuit by providing diodes equal to the number of light emitting diodes, and connects the common point C of the diodes.
Since a protective diode was installed from the power supply on the opposite side of the inspection switch, only one protective diode was required.
このため発光ダイオードの数が１００個とか２００個と
かになると組立配線の工数が大巾に低減するものである
。Therefore, when the number of light emitting diodes increases to 100 or 200, the number of assembly and wiring steps is greatly reduced.
第１図ないし第３図は従来の発光ダイオード表示回路を
示す回路図、第４図は本考案の発光ダイオード表示回路
の一実施例を示す回路図、第５図むよび第６図は本考案
のそれぞれ異なる他の実施例を示す回路図である。
ＬＥＤ １〜ＬＥＤｎ”発光ダイオード、Ｒ１−Ｒｎ・
・・電流制限抵抗、Ｆ１〜Ｆｎ・・・表示用接点、Ｄｔ
ｌ〜Ｄｔｎ、Ｄ・・・ダイオード、３０Ｔ・・・点検ス
イッチ。Figures 1 to 3 are circuit diagrams showing conventional light emitting diode display circuits, Figure 4 is a circuit diagram showing an embodiment of the light emitting diode display circuit of the present invention, and Figures 5 and 6 are circuit diagrams showing the present invention. FIG. 3 is a circuit diagram showing other different embodiments. LED 1~LEDn'' Light emitting diode, R1-Rn・
・・Current limiting resistor, F1 to Fn ・・Display contact, Dt
l~Dtn, D...Diode, 30T...Inspection switch.
Claims (1)
ないし複数組直流制御母線間に接続し、前記発光ダイオ
ードのアノード又はカソードが接続される側の直流制御
母線に対して保護用ダイオードのカソード又はアノード
を接続し、この保護用ダイオードの他の端子を点検用ス
イッチを介して他の極性の母線に接続し、前記発光ダイ
オードおよびスイッチの接続点を前記保護用ダイオード
および点検用スイッチの接続点に対して順方向に点検時
の回り込み防止ダイオードにより接続したことを特徴と
する発光ダイオード表示回路装置。A series circuit consisting of a light emitting diode and a switch is connected between one or more sets of DC control busbars, and the cathode or anode of the protective diode is connected to the DC control busbar on the side to which the anode or cathode of the light emitting diode is connected. Then, connect the other terminal of this protective diode to the bus bar of the other polarity via the inspection switch, and connect the connection point of the light emitting diode and the switch with respect to the connection point of the protection diode and inspection switch. A light emitting diode display circuit device, characterized in that it is connected in the direction by a diode to prevent wraparound during inspection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979013417U JPS5838462Y2 (en) | 1979-02-06 | 1979-02-06 | Light emitting diode display circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979013417U JPS5838462Y2 (en) | 1979-02-06 | 1979-02-06 | Light emitting diode display circuit device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55117088U JPS55117088U (en) | 1980-08-18 |
| JPS5838462Y2 true JPS5838462Y2 (en) | 1983-08-31 |
Family
ID=28831469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979013417U Expired JPS5838462Y2 (en) | 1979-02-06 | 1979-02-06 | Light emitting diode display circuit device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838462Y2 (en) |
-
1979
- 1979-02-06 JP JP1979013417U patent/JPS5838462Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55117088U (en) | 1980-08-18 |
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