JPH073889B2 - Drive circuit for light emitting element - Google Patents
Drive circuit for light emitting elementInfo
- Publication number
- JPH073889B2 JPH073889B2 JP8174486A JP8174486A JPH073889B2 JP H073889 B2 JPH073889 B2 JP H073889B2 JP 8174486 A JP8174486 A JP 8174486A JP 8174486 A JP8174486 A JP 8174486A JP H073889 B2 JPH073889 B2 JP H073889B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- emitting element
- light emitting
- current
- circuit
- 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
- Semiconductor Lasers (AREA)
- Led Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、発光素子を電流ドライブする発光素子用ドラ
イブ回路に関し、特に増幅器を用いた発光素子用ドライ
ブ回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting element drive circuit for driving a light emitting element with a current, and more particularly to a light emitting element drive circuit using an amplifier.
従来、この種の発光素子用ドライブ回路は、例えば第３
図に示すように、増幅器４と、コンデンサC1と、発光素
子１と、定電流発生回路２からなっている。Conventionally, a drive circuit for a light emitting element of this type is, for example, a third drive circuit.
As shown in the figure, it comprises an amplifier 4, a capacitor C 1 , a light emitting element 1 and a constant current generating circuit 2.
入力信号S1は、増幅器４で電圧増幅されコンデンサC1を
通って定電流発生回路２に接続される。定電流発生回路
２では、発光素子１を電流ドライブすることのできる一
定の直流電流を発生することができるようになってお
り、又コンデンサC1を通って入力してきた入力信号S1の
電圧レベルに応じて交流のドライブ電流を発生すること
ができる。The input signal S 1 is voltage-amplified by the amplifier 4 and is connected to the constant current generating circuit 2 through the capacitor C 1 . The constant current generating circuit 2 is capable of generating a constant direct current capable of driving the light emitting element 1 with a current, and the voltage level of the input signal S 1 input through the capacitor C 1. An alternating drive current can be generated accordingly.
従来の発光素子用ドライブ回路では、この交流のドライ
ブ電流と前記直流電流を重畳して、発光素子１を電流ド
ライブしている。In the conventional drive circuit for the light emitting element, the light emitting element 1 is current-driven by superposing the alternating drive current and the direct current.
上述した従来の発光素子用ドライブ回路では、端子5,端
子６そして端子７よりそれぞれ、増幅器４に電源電流
I1，定電流発生回路２に電源電流I2，そして発光素子１
に直流ドライブ電流I3が正の電圧V+より流入していた。In the conventional light emitting element drive circuit described above, the power supply current is supplied to the amplifier 4 from the terminals 5, 6, and 7, respectively.
I 1 , power supply current I 2 to constant current generating circuit 2 , and light emitting element 1
The DC drive current I 3 was flowing in from the positive voltage V + .
発光素子用ドライブ回路全体の消費電力W1は W1＝V+・（I1＋I2＋I3） となる。The power consumption W 1 of the entire drive circuit for the light emitting element is W 1 = V + · (I 1 + I 2 + I 3 ).
増幅器４を流れる電源電流I1は、増幅器４を希望とする
動作をさせるためには必要な電流量であり、また発光素
子１を流れる直流ドライブ電流I3も発光素子１が「ドラ
イブ電流の大きさにより、発光光量が決定される」とい
うことによりやはり必要な電流量である。The power source current I 1 flowing through the amplifier 4 is the amount of current necessary for the desired operation of the amplifier 4, and the direct-current drive current I 3 flowing through the light emitting element 1 is also a value of the drive current I 3 That is, the amount of emitted light is determined. ”
しかし、電源電圧V+と電流（I1＋I2＋I3）による消費電
力W1の中には、抵抗等で熱として消費してしまう無駄な
ものがある。この部分の消費電力を軽減することは、可
搬型装置及び小形装置等ではたいへん効果的なものであ
る。However, in the power consumption W 1 due to the power supply voltage V + and the current (I 1 + I 2 + I 3 ), there is a waste that is consumed as heat by a resistor or the like. Reducing the power consumption of this portion is very effective for portable devices and small devices.
本発明の発光素子用ドライブ回路は、第１の端子と第２
の端子との間に定電流発生回路，電圧安定回路および増
幅器を直列に接続し、前記第１の端子に電位が等しい第
３の端子と前記定電流発生回路との間に発光素子を接続
し、前記第１の端子または前記第２の端子のいずれか一
方を地気に接続すると共に前記電圧安定回路を地気にも
接続し、前記第１の端子からの電源電流で動作する前記
定電流発生回路は前記発光素子に一定のドライブ電流が
流れるようにし、入力信号を増幅した前記増幅器の出力
信号をコンデンサを介して前記定電流発生回路に入力し
て前記増幅器の入力信号に応じた交流電流を前記ドライ
ブ電流に重畳して前記発光素子に流し、前記第１の端子
を流れる電源電流と前記第３の端子を流れるドライブ電
流の合計と前記増幅器を動作させる前記第２の端子を流
れる電流との差が前記電圧安定回路と地気との間に流れ
ることを特徴とする。A drive circuit for a light emitting device according to the present invention includes a first terminal and a second terminal.
A constant current generating circuit, a voltage stabilizing circuit, and an amplifier are connected in series with the terminal of, and a light emitting element is connected between the third terminal having the same potential as the first terminal and the constant current generating circuit. A constant current that operates by the power supply current from the first terminal, connecting either one of the first terminal or the second terminal to the ground, and also connecting the voltage stabilizing circuit to the ground. The generating circuit allows a constant drive current to flow through the light emitting element, and the output signal of the amplifier, which is obtained by amplifying the input signal, is input to the constant current generating circuit via a capacitor to generate an alternating current corresponding to the input signal of the amplifier. Is superposed on the drive current and passed through the light emitting element, and the sum of a power supply current flowing through the first terminal and a drive current flowing through the third terminal and a current flowing through the second terminal for operating the amplifier. The difference between Wherein the flow between the serial voltage stabilizing circuit and earthed.
本発明の実施例について図面を参照して説明する。 Embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明による発光素子用ドライブ回路の一実
施例の回路図である。FIG. 1 is a circuit diagram of an embodiment of a light emitting element drive circuit according to the present invention.
本実施例の発光素子用ドライブ回路は、発光素子１と、
この発光素子１を電流ドライブする定電流発生回路２
と、入力信号S1を電圧増幅する増幅器４と、端子５を介
して増幅器４に接続され、また定電流発生回路２と地気
にも接続される電圧安定回路３とを備え、増幅器４の出
力はコンデンサC1を介して定安流発生回路２に接続され
る。また、定電流発生回路２および発光素子１それぞれ
に接続される端子6,7には電源電圧V+が加えられ、増幅
器４は端子８を介して接地されている。The drive circuit for the light emitting element of the present embodiment includes the light emitting element 1 and
Constant current generating circuit 2 for current driving this light emitting element 1
And an amplifier 4 for amplifying the input signal S 1 by voltage, a constant current generating circuit 2 connected to the amplifier 4 via a terminal 5, and a voltage stabilizing circuit 3 also connected to the ground. The output is connected to the constant low current generating circuit 2 via the capacitor C 1 . A power supply voltage V + is applied to terminals 6 and 7 connected to the constant current generating circuit 2 and the light emitting element 1, respectively, and the amplifier 4 is grounded via a terminal 8.
ここで、増幅器４を動作させるのに必要な電源電流を
I1，発光素子に流す電流をI3とする。端子６からの電源
電流I2は定電流発生回路２を動作させるものであり、I2
＋I3＞I1の場合、後述する第２図のような回路構成では
なく、第１図のような回路構成とする必要がある。端子
７からの電源電流I3は発光素子１を直流ドライブすると
同時に電圧安定回路３を通る。端子６からの電源電流I2
及び発光素子１をドライブした電流I3は定電流発生回路
２を経て一部が増幅器４の電源入力電流I1となり、残り
の電流（I2＋I3）−I1が地気へ流れる。Here, the power supply current required to operate the amplifier 4 is
Let I 1 be the current flowing through the light emitting element and I 3 . The power supply current I 2 from the terminal 6 is used to operate the constant current generation circuit 2, and I 2
When + I 3 > I 1 , it is necessary to use the circuit configuration shown in FIG. 1 instead of the circuit configuration shown in FIG. 2 described later. The power supply current I 3 from the terminal 7 drives the light emitting element 1 by direct current and, at the same time, passes through the voltage stabilizing circuit 3. Power supply current I 2 from terminal 6
The current I 3 that drives the light emitting element 1 partially passes through the constant current generating circuit 2 to become the power input current I 1 of the amplifier 4, and the remaining current (I 2 + I 3 ) −I 1 flows to the earth.
すなわち消費電力W2は、 W2＝V+・（I2＋I3） となる。That is, the power consumption W 2 is W 2 = V + · (I 2 + I 3 ).
第２図は本発明の他の実施例の回路図で、I1＞I2＋I3の
場合の実施例の回路図である。第１図に示す実施例との
違いは、端子6,7がGND接続（接地）となり、端子８が電
源電圧V-（絶対値はV+と同じとする。）と接続となる。
増幅器４の電源入力電流I1の１部は、発光素子１をドラ
イブする電流I3とともに、定電流発生回路２の電源電流
I2となる。FIG. 2 is a circuit diagram of another embodiment of the present invention, which is a circuit diagram of an embodiment when I 1 > I 2 + I 3 . The difference from the embodiment shown in FIG. 1 is that terminals 6 and 7 are connected to GND (ground) and terminal 8 is connected to power supply voltage V − (absolute value is the same as V + ).
A part of the power supply input current I 1 of the amplifier 4 is the power supply current of the constant current generating circuit 2 together with the current I 3 that drives the light emitting element 1.
It becomes I 2 .
すなわち消費電力W3は、 W3＝V-・I1 となる。That is, the power consumption W 3 is W 3 = V − · I 1 .
Ｖ＝｜V+｜＝｜V-｜とすると、消費電力W2，W3は従来の
発光素子用ドライブ回路の消費電力W1に対し W1＞W2（I2＋I3＞I1の場合）、 W1＞W3（I1＞I2＋I3の場合） となり、従来の発光素子用ドライブ回路より消費電力を
軽減することができる。 V = | V + | = | V - | and when the power consumption W 2, W 3 whereas power W 1 of the drive circuit for a conventional light-emitting element W 1> W 2 (I 2 + I 3> of I 1 In this case, W 1 > W 3 (when I 1 > I 2 + I 3 ), and the power consumption can be reduced compared to the conventional drive circuit for the light emitting element.
以上説明したように発光素子用ドライブ回路は、発光素
子を流れる直流電流と増幅器の電源電流が直列に流れる
ようにすることにより、発光素子用ドライブ回路全体と
しての消費電力を軽減できる効果がある。As described above, in the light emitting element drive circuit, the direct current flowing through the light emitting element and the power supply current of the amplifier are made to flow in series, whereby the power consumption of the entire light emitting element drive circuit can be reduced.
第１図および第２図は、それぞれ本発明の一実施例の発
光素子用ドライブの回路図および他の実施例の発光素子
用ドライブ回路の回路図、第３図は、従来の発光素子用
ドライブ回路の回路図である。 １……発光素子、２……定電流発生回路、３……電圧安
定回路、４……増幅器、５〜８……端子、C1……コンデ
ンサ、S1……入力信号電圧、I1……増幅器４の電源電
流、I2……定電流発生回路２の電源電流、I3……発光素
子１のドライブ電流。1 and 2 are a circuit diagram of a light emitting element drive according to an embodiment of the present invention and a circuit diagram of a light emitting element drive circuit according to another embodiment, and FIG. 3 is a conventional light emitting element drive. It is a circuit diagram of a circuit. 1 ...... emitting element, 2 ...... constant current generating circuit, 3 ...... voltage stabilizing circuit, 4 ...... amplifiers, 5-8 ...... terminal, C 1 ...... capacitor, S 1 ...... input signal voltage, I 1 ... ... power supply current of amplifier 4, I 2 ... power supply current of constant current generating circuit 2, I 3 ... drive current of light emitting element 1.
Claims (1)
生回路，電圧安定回路および増幅器を直列に接続し、前
記第１の端子に電位が等しい第３の端子と前記定電流発
生回路との間に発光素子を接続し、前記第１の端子また
は前記第２の端子のいずれか一方を地気に接続すると共
に前記電圧安定回路を地気にも接続し、前記第１の端子
からの電源電流で動作する前記定電流発生回路は前記発
光素子に一定のドライブ電流が流れるようにし、入力信
号を増幅した前記増幅器の出力信号をコンデンサを介し
て前記定電流発生回路に入力して前記増幅器の入力信号
に応じた交流電流を前記ドライブ電流に重畳して前記発
光素子に流し、前記第１の端子を流れる電源電流と前記
第３の端子を流れるドライブ電流の合計と前記増幅器を
動作させる前記第２の端子を流れる電流との差が前記電
圧安定回路と地気との間に流れることを特徴とする発光
素子用ドライブ回路。1. A constant current generating circuit, a voltage stabilizing circuit and an amplifier are connected in series between a first terminal and a second terminal, and a third terminal having the same potential as the first terminal and the constant terminal. A light emitting element is connected between the current generating circuit and either the first terminal or the second terminal is connected to the ground and the voltage stabilizing circuit is connected to the ground. The constant current generating circuit that operates with the power supply current from the terminal of the device allows a constant drive current to flow through the light emitting element, and the output signal of the amplifier that amplifies the input signal is input to the constant current generating circuit through a capacitor. Then, an alternating current corresponding to an input signal of the amplifier is superposed on the drive current and is passed through the light emitting element, and the sum of the power supply current flowing through the first terminal and the drive current flowing through the third terminal and the amplifier. The first to operate Drive circuit for a light emitting element a difference between the current flowing through the terminal, characterized in that the flow between said voltage stabilizing circuit and earthed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8174486A JPH073889B2 (en) | 1986-04-08 | 1986-04-08 | Drive circuit for light emitting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8174486A JPH073889B2 (en) | 1986-04-08 | 1986-04-08 | Drive circuit for light emitting element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62237772A JPS62237772A (en) | 1987-10-17 |
| JPH073889B2 true JPH073889B2 (en) | 1995-01-18 |
Family
ID=13754947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8174486A Expired - Lifetime JPH073889B2 (en) | 1986-04-08 | 1986-04-08 | Drive circuit for light emitting element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073889B2 (en) |
-
1986
- 1986-04-08 JP JP8174486A patent/JPH073889B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62237772A (en) | 1987-10-17 |
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