JPH0422032B2 - - Google Patents

Info

Publication number
JPH0422032B2
JPH0422032B2 JP11360782A JP11360782A JPH0422032B2 JP H0422032 B2 JPH0422032 B2 JP H0422032B2 JP 11360782 A JP11360782 A JP 11360782A JP 11360782 A JP11360782 A JP 11360782A JP H0422032 B2 JPH0422032 B2 JP H0422032B2
Authority
JP
Japan
Prior art keywords
emitting diode
light emitting
light
voltage
disconnection
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
Application number
JP11360782A
Other languages
Japanese (ja)
Other versions
JPS594186A (en
Inventor
Hideo Nishi
Osamu Waki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stanley Electric Co Ltd
Original Assignee
Stanley Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Stanley Electric Co Ltd filed Critical Stanley Electric Co Ltd
Priority to JP57113607A priority Critical patent/JPS594186A/en
Publication of JPS594186A publication Critical patent/JPS594186A/en
Publication of JPH0422032B2 publication Critical patent/JPH0422032B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits

Landscapes

  • Led Devices (AREA)

Description

【発明の詳細な説明】 本発明は断線補償機能を備えた発光ダイオード
断線補償装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light emitting diode disconnection compensation device having a disconnection compensation function.

一般に発光ダイオード装置は警告等の表示装置
の光源、もしくはフオトカプラーにおける発光側
光源として使用され、長寿命でかつ高信頼性のも
とに使用されているのが実情である。しかしなが
ら、これらの光源としての発光ダイオードにあつ
ては、時として熱、又は振動等の外的要因により
ボンデイングされたワイヤーが発光ダイオードチ
ツプ又は電極端子から剥離し、発光不能になる場
合があり、発光装置としての機能を失う事態がし
ばしばある。このようなことでは発光ダイオード
装置として信頼性が失われると共に不動作による
事故の発生を防止できないと云う欠点がある。
In general, light emitting diode devices are used as light sources for display devices for warnings, etc., or as light sources on the light emitting side of photocouplers, and the reality is that they have a long life and are used with high reliability. However, in the case of these light-emitting diodes as light sources, sometimes the bonded wires may peel off from the light-emitting diode chip or electrode terminal due to external factors such as heat or vibration, making it impossible to emit light. There are often situations where the device loses its functionality. In such a case, reliability as a light emitting diode device is lost and accidents due to non-operation cannot be prevented.

本発明はこれらの欠点を除去するためになされ
たものであつて、その目的は発光すべき発光ダイ
オードが発光不能になつた場合に、速かにこれに
代つて他の発光ダイオードが動作し、その補償を
行うようにした発光ダイオード装置を提供しよう
とするものである。
The present invention has been made to eliminate these drawbacks, and its purpose is to quickly replace the light emitting diode that should emit light when the light emitting diode that should emit light becomes incapable of emitting light. The present invention aims to provide a light emitting diode device that compensates for this.

この目的を達成するためになされた本発明は、
夫々立上り電圧の異なる少なくとも2個の可視光
型発光ダイオードもしくは可視光型発光ダイオー
ドチツプを電気的に並列に接続し、且つ常時は低
い方の立上り電圧になるよう順方向電流を設定
し、立上り電圧の低い方の発光ダイオードが不点
灯の状態になつたときに直ちに立上り電圧の高い
方の発光ダイオードが点灯してその照明機能を補
償するようにしたことを特徴とする発光ダイオー
ド断線補償装置であつて、立上り電圧の低い方の
発光ダイオードが通常点灯する主発光ダイオード
であり、高い方の立上り電圧で点灯するものが補
償用発光ダイオードである。そして、回路電圧と
しては常時は、高い方の立上り電圧に達しないよ
うな低い方の順方向電圧になるよう順方向電流を
設定しておくことで、断線時の切り替えが自動的
に直ちに行えるのである。
The present invention has been made to achieve this purpose.
At least two visible light light emitting diodes or visible light light emitting diode chips with different rise voltages are electrically connected in parallel, and the forward current is set so that the rise voltage is always lower, and the rise voltage The light emitting diode disconnection compensator is characterized in that when the light emitting diode with a lower rise voltage becomes unlit, the light emitting diode with a higher rise voltage is immediately turned on to compensate for its illumination function. The light emitting diode with the lower rising voltage is the main light emitting diode that normally lights up, and the one that lights up with the higher rising voltage is the compensation light emitting diode. By setting the forward current so that the circuit voltage is always a lower forward voltage that does not reach the higher rising voltage, switching in the event of a disconnection can be done automatically and immediately. be.

次に本発明を図示の実施例に基き更に詳しく説
明すると、立上り電圧が異る2個の可視光型発光
ダイオード1,2並列に接続し、これらのアノー
ド側は電流制限用抵抗3を介して電源4に接続
し、カソード側はトランジスタ5のコレクタ側に
接続され、該トランジスタはそのベースが光信号
出力部6に接続され、該出力部6からの出力信号
を得て動作するように接続されている。
Next, to explain the present invention in more detail based on the illustrated embodiment, two visible light type light emitting diodes 1 and 2 with different rising voltages are connected in parallel, and their anode sides are connected through a current limiting resistor 3. It is connected to a power source 4, and its cathode side is connected to the collector side of a transistor 5, whose base is connected to an optical signal output section 6, and is connected to operate upon receiving an output signal from the output section 6. ing.

前記発光ダイオード1,2は夫々立上り電圧が
異るものを使用するが、例えば発光ダイオード1
にはGaAlAsの材料で形成された第2図に示した
立上り電圧特性を有するものか、又はGaAsPを
材料として形成した第3図に示す特性の発光ダイ
オードが使用される。この特性図から明らかなよ
うに、発光ダイオード1の立上り電圧は約1.5ボ
ルト又は1.4ボルトである。これに対し、発光ダ
イオード2は、GaPを材料として形成し、第4図
に示したような立上り電圧特性を有する。即ち、
発光ダイオード2は約1.85ボルトの立上り電圧を
有するようにする。
The light emitting diodes 1 and 2 have different rise voltages, but for example, the light emitting diode 1
A light emitting diode made of GaAlAs and having the rise voltage characteristics shown in FIG. 2, or a light emitting diode made of GaAsP and having the characteristics shown in FIG. 3 is used. As is clear from this characteristic diagram, the rising voltage of the light emitting diode 1 is about 1.5 volts or 1.4 volts. On the other hand, the light emitting diode 2 is made of GaP and has a rising voltage characteristic as shown in FIG. That is,
The light emitting diode 2 has a rising voltage of approximately 1.85 volts.

このように、立上り電圧が異る2個の発光ダイ
オード1,2を並列に接続し、常時は発光ダイオ
ード1のみが発光し、該発光ダイオードのボンデ
イングワイヤーが熱もしくは振動等によつて断線
して発光不能になると、この発光ダイオード1及
びもう一つの発光ダイオード2の両端子a,b間
の電圧が昇圧し、それに伴つて発光ダイオード2
が点灯する。
In this way, two light-emitting diodes 1 and 2 with different rise voltages are connected in parallel, and only light-emitting diode 1 emits light at all times, and the bonding wire of the light-emitting diode is disconnected due to heat or vibration. When light emission becomes impossible, the voltage between both terminals a and b of this light emitting diode 1 and another light emitting diode 2 increases, and accordingly, the light emitting diode 2
lights up.

つまり、並列に接続してある両端子a,b間の
端子電圧が、通常は1.5ボルト以下で発光ダイオ
ード1が点灯することになり、この一方の発光ダ
イオード1の点灯による他方の発光ダイオード2
の立上り電圧に達しない順方向電圧になるように
回路に対して順方向電流を設定しておけば良い。
In other words, the light emitting diode 1 lights up when the terminal voltage between the two terminals a and b connected in parallel is normally 1.5 volts or less, and when one light emitting diode 1 lights up, the other light emitting diode 2 lights up.
It is sufficient to set the forward current for the circuit so that the forward voltage does not reach the rising voltage of .

このように順方向電流を設定しておくことによ
り、発光ダイオード1が正常である時には、光信
号出力部6からの出力信号の印加によつてトラン
ジスタ5がオン状態にあり、発光ダイオード1が
発光していて、他方の発光ダイオード2は全く発
光しない状態にある。そして発光ダイオード1が
発光不能になると、端子a,b間電圧が上り発光
ダイオード2が発光して、一方の発光ダイオード
1の断線補償を行うのである。この場合、発光ダ
イオード2の点灯が単に発光ダイオード1の補償
だけでなく、一方の発光ダイオード1の断線を報
知するようにしてある。つまり、機能的に補償し
ながら、発光ダイオード2の点灯による回路中の
電圧変化によつて、前記発光ダイオード1の断線
が検知できるのである。
By setting the forward current in this way, when the light emitting diode 1 is normal, the transistor 5 is in the on state due to the application of the output signal from the optical signal output section 6, and the light emitting diode 1 emits light. The other light emitting diode 2 is in a state where it does not emit light at all. When the light emitting diode 1 becomes unable to emit light, the voltage between the terminals a and b rises, causing the light emitting diode 2 to emit light, thereby compensating for the disconnection of one of the light emitting diodes 1. In this case, the lighting of the light emitting diodes 2 not only compensates for the light emitting diodes 1, but also notifies the disconnection of one of the light emitting diodes 1. In other words, the disconnection of the light emitting diode 1 can be detected based on the voltage change in the circuit caused by the lighting of the light emitting diode 2, while functionally compensating for it.

以上説明したように本発明に係る発光ダイオー
ド断線補償装置は、夫々立上り電圧の異なる少な
くとも2個の可視光型発光ダイオードもしくは可
視光型発光ダイオードチツプを電気的に並列に接
続し、且つ常時は低い方の立上り電圧になるよう
順方向電流を設定し、立上り電圧の低い方の発光
ダイオードが不点灯の状態になつたときに直ちに
立上り電圧の高い方の発光ダイオードが点灯して
その照明機能を補償するように構成したことによ
り、一方の発光ダイオードが発光不能の状態にな
つた時に、直ちに他方の発光ダイオードが点灯し
て補償し、一時的にせよ照明不能の状態がなくな
り、光信号等の表示装置又はホトカプラーの光源
として使用する場合に著しく信頼性に富むという
優れた効果を奏する。
As explained above, the light emitting diode disconnection compensating device according to the present invention electrically connects in parallel at least two visible light light emitting diodes or visible light light emitting diode chips each having a different rise voltage, and the rising voltage is normally low. The forward current is set so that the light emitting diode with the lower rise voltage turns off, and the light emitting diode with the higher rise voltage turns on immediately to compensate for its lighting function. With this configuration, when one light emitting diode becomes unable to emit light, the other light emitting diode immediately lights up to compensate, eliminating the state of being unable to illuminate, even if only temporarily, and allowing the display of optical signals, etc. When used as a light source for a device or a photocoupler, it exhibits an excellent effect of being extremely reliable.

又、一方の発光ダイオードが断線し他方の発光
ダイオードが点灯したときには、回路中の電圧変
化を検知して、前記一方の発光ダイオードの断線
を検出することができるという優れた効果も奏す
る。
Furthermore, when one light emitting diode is disconnected and the other light emitting diode is lit, a voltage change in the circuit can be detected to detect the disconnection of the one light emitting diode, which is an excellent effect.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る発光ダイオード断線補償
装置の略示的回路図、第2図及び第3図は同装置
の一方の発光ダイオードとして使用される材料の
電流・電圧特性図、第4図は同装置の他方の発光
ダイオードとして使用される材料の電流・電圧特
性図である。 1……一方の発光ダイオード、2……他方の発
光ダイオード(補償用)、3……電流制限用抵抗、
4……電源、5……トランジスタ、6……光信号
出力部、a,b……発光ダイオードの両端子。
FIG. 1 is a schematic circuit diagram of a light emitting diode disconnection compensation device according to the present invention, FIGS. 2 and 3 are current/voltage characteristic diagrams of the material used as one of the light emitting diodes of the device, and FIG. 4 is a current/voltage characteristic diagram of the material used as the other light emitting diode of the same device. 1... One light emitting diode, 2... Other light emitting diode (for compensation), 3... Current limiting resistor,
4...Power supply, 5...Transistor, 6...Optical signal output section, a, b...Both terminals of the light emitting diode.

Claims (1)

【特許請求の範囲】[Claims] 1 夫々立上り電圧の異なる少なくとも2個の可
視光型発光ダイオードもしくは可視光型発光ダイ
オードチツプを電気的に並列に接続し、且つ常時
は低い方の立上り電圧になるよう順方向電流を設
定し、立上り電圧の低い方の発光ダイオードが不
点灯の状態になつたときに直ちに立上り電圧の高
い方の発光ダイオードが点灯してその照明機能を
補償するようにしたことを特徴とする発光ダイオ
ード断線補償装置。
1 At least two visible light-emitting diodes or visible light-emitting diode chips with different rising voltages are electrically connected in parallel, and the forward current is set so that the rising voltage is always the lower one. A light-emitting diode disconnection compensator characterized in that when the light-emitting diode with a lower voltage becomes unlit, the light-emitting diode with a higher rising voltage is immediately turned on to compensate for its illumination function.
JP57113607A 1982-06-30 1982-06-30 Light emitting diode device Granted JPS594186A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57113607A JPS594186A (en) 1982-06-30 1982-06-30 Light emitting diode device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57113607A JPS594186A (en) 1982-06-30 1982-06-30 Light emitting diode device

Publications (2)

Publication Number Publication Date
JPS594186A JPS594186A (en) 1984-01-10
JPH0422032B2 true JPH0422032B2 (en) 1992-04-15

Family

ID=14616499

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57113607A Granted JPS594186A (en) 1982-06-30 1982-06-30 Light emitting diode device

Country Status (1)

Country Link
JP (1) JPS594186A (en)

Also Published As

Publication number Publication date
JPS594186A (en) 1984-01-10

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