JPS5955518A - Constant current circuit - Google Patents
Constant current circuitInfo
- Publication number
- JPS5955518A JPS5955518A JP57167253A JP16725382A JPS5955518A JP S5955518 A JPS5955518 A JP S5955518A JP 57167253 A JP57167253 A JP 57167253A JP 16725382 A JP16725382 A JP 16725382A JP S5955518 A JPS5955518 A JP S5955518A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- resistor
- diode
- constant current
- power supply
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Amplifiers (AREA)
Abstract
Description
【発明の詳細な説明】
おいては、定電流バイアスが必要となるが、この電流源
は通常自刃では起動できｌ′いから、起動させるための
手段が必要となる。DETAILED DESCRIPTION OF THE INVENTION In this case, a constant current bias is required, but since this current source cannot normally be started by a self-blade, a means for starting it is required.
第１図はこのような要求に基つ〈従来の定電流回路の一
例である。同図において、（１）は電源電圧Ｖｃｃが印
加される電源端子（１０）にエミッタが接続された第１
のトランジスタ、（２）はコレクタ・ベース間が短絡さ
れた第２のトランジスタで、上記端子（１０） Ｋエミ
ッタが接続され、第１のトランジスタ（１）（Ｄ ベー
スに： ベース−７’）： 接続されている。（３）ハ
ベースが第１のトランジスタ（１）のコＬ／クタに７ま
たコレクタが第２のトランジスタ（２）のコレクタおよ
びベースに接続された第３のトランジスタ、（４）は第
３のトランジスタ（３）のエミッタと接地間に接続され
た第１の抵抗器、（５）はカソードが第３のトランジス
タ（３）のベースに、またアノードが接地されたツエナ
ーダイオードのような第１の定電圧素子、（６）は電源
端子（１０１と第３のトランジスタ（３）のベース間に
接続された第２の抵抗器である。FIG. 1 shows an example of a conventional constant current circuit based on such requirements. In the figure, (1) is the first terminal whose emitter is connected to the power supply terminal (10) to which the power supply voltage Vcc is applied.
Transistor (2) is a second transistor whose collector and base are short-circuited, and the terminal (10) K emitter is connected to the first transistor (1) (D base: base -7'): It is connected. (3) A third transistor whose base is connected to the collector L/ctor of the first transistor (1) and whose collector is connected to the collector and base of the second transistor (2); (4) is the third transistor; (3) a first resistor connected between the emitter and ground; (5) a first resistor, such as a Zener diode, whose cathode is connected to the base of the third transistor (3) and whose anode is connected to ground; The voltage element (6) is a second resistor connected between the power supply terminal (101) and the base of the third transistor (3).
次に動作について説明する。Next, the operation will be explained.
第１ないし第３のトランジスタ（１）〜（３）ならびに
第１の抵抗器（４）およびツェナーダイオード（５）で
構成される電流源は、第３のトランジスタ（３）がＯＮ
されない限り動作しない。起動時に、第３のトランジス
タ（３）は第２の抵抗器（６）を介してベース電流が供
給されることによシＯＮし、続いてＭ、！、 １のトラ
ンジスタ（１）がＯＮＬ続ける。A current source composed of first to third transistors (1) to (3), a first resistor (4), and a Zener diode (5) is configured such that the third transistor (3) is turned on.
It will not work unless it is. At start-up, the third transistor (3) is turned on by being supplied with a base current via the second resistor (6), and then M,! , 1 transistor (1) continues ONL.
定常時においてはツェナーダイオード（５）で定まる定
電圧をうけて第１の抵抗器（４）には定電流が流り、る
。During steady state, a constant current flows through the first resistor (4) in response to a constant voltage determined by the Zener diode (5).
しかるにこのような従来回路においては、電源′Ｐｉ１
．圧Ｖｃｃが変動すると、第２の抵抗器（６）を介して
ツェナーダイオード（５）に流れ込む電流値が変化する
から、これがツェナー電圧値を変化させることになり、
定市、流回路の安定化を損なうことＫなる。However, in such a conventional circuit, the power supply 'Pi1
．． When the voltage Vcc changes, the current value flowing into the Zener diode (5) via the second resistor (6) changes, which changes the Zener voltage value.
This will impair the stability of the flow circuit.
この対策として第２の抵抗器（６）を大きな値にするこ
とが考えられるが、モノリシックＩＣ［おいては、抵抗
値の大きさはその一！まチップ面積の増大化につながる
だめ、コスト的に不利になる。甘だ抵抗値を大きくする
だけでは根本的な対策とはなシ得ない。As a countermeasure to this problem, it is possible to increase the value of the second resistor (6), but in monolithic ICs, the resistance value is one of the largest values! However, this leads to an increase in the chip area, which is disadvantageous in terms of cost. Merely increasing the resistance value is not a fundamental countermeasure.
この発明は上記従来の欠点を除去するためになされたも
ので、従来のツェナータイオードと電圧値の異なるツェ
ナーダイオードを用意して両者を通常のクイオードで接
続することにより、亀源電１圧の広い範囲にわたって定
電流特性を安定に得ることができる定電流回路を提供す
ることを目的としている。This invention was made to eliminate the above-mentioned drawbacks of the conventional Zener diode, and by preparing Zener diodes with different voltage values from the conventional Zener diode and connecting them with a normal quasiode, the main power source voltage can be reduced to 1 voltage. The object of the present invention is to provide a constant current circuit that can stably obtain constant current characteristics over a wide range.
第２図はこの発明の一実施例に係る定電流回路を示すも
ので、第１図と同一箇所には同一符号を付して説明を省
略する。同図において、（８）はアノードが第２の抵抗
器（６）に、カソードが第１のツェナーダイオード（５
）、に接続されたダイオード、（７）はカソードが第２
の抵抗器（６）に接続され、アノードが接地された第２
のツェナーダイオードであり、とのツェナーダイオード
（７）の電圧値ｖＺ２は第１のツェナーダイオード（５
）のそれｖｚ、に比し、ｖｚ、＞ｖｚ２と低くなってい
る〇
次に本実施例の動作を説明する。FIG. 2 shows a constant current circuit according to an embodiment of the present invention, and the same parts as in FIG. In the figure, (8) has an anode connected to the second resistor (6) and a cathode connected to the first Zener diode (5).
), the diode (7) is connected to the second
a second resistor (6) with its anode grounded.
The voltage value vZ2 of the Zener diode (7) is the same as that of the first Zener diode (5).
) is lower, vz,>vz2. Next, the operation of this embodiment will be explained.
起動時には第３のトランジスタ（３）のベースＩｔ 流
が、第２の抵抗器（６）、ダイオード（８）を介して供
給されることによシ該トランジスタ（３）はＯＮされ、
Ｍ「いて第２のトランジスタ（２）、第１のトランジス
タ（１）が順次ＯＮ Ｌ、第１の抵抗器（４）Ｋ定電流
が供給される。定常時ＶＣおいては、ツェナーダイオー
ド（５）の電圧値ＶＺｌとツェナーダイオード（７）の
電圧値■Ｚ２は、上述のように、ｖｚ、＞ｖｚ２と作ら
れているためダイオード（８）は逆バイアス状態となっ
ており、０ＦＦＩ、ている。しだがって角、源電圧Ｖｃ
ｃが変動しても抵抗器（６）を介して流れ込む電流は全
て第２のツェナータイオード（７）に流れ込み、第１の
ツェナータイオード（５）Ｋは影曽を与えなくなり、し
たがって第１の抵抗器（４）に流れる定電流値は電源電
圧Ｖｃｃの変動に対して極めて安定した状態を得ること
ができる。At startup, the base It current of the third transistor (3) is supplied via the second resistor (6) and the diode (8), so that the transistor (3) is turned on.
The second transistor (2) and the first transistor (1) are turned on in sequence, and a constant current is supplied to the first resistor (4). ) voltage value VZl and the voltage value ■Z2 of the Zener diode (7) are made to be vz,>vz2 as described above, so the diode (8) is in a reverse bias state, and is 0FFI. .Therefore, the angle, source voltage Vc
Even if c varies, all the current flowing through the resistor (6) flows into the second Zener diode (7), and the first Zener diode (5) K no longer gives any shadow, so the first The constant current value flowing through the resistor (4) can be kept extremely stable against fluctuations in the power supply voltage Vcc.
なお、ツェナー電圧値ｖＺｌとｖｚ２を異なった値にす
ることは慣別なプロセスを必要としないため、実現は容
易であり、定電圧値のバラツキに対しても従来方法に比
べ太幅に余裕を持った回路となっている。Note that setting the Zener voltage values vZl and vz2 to different values does not require a customary process, so it is easy to realize, and it allows a wider margin for variations in the constant voltage value than the conventional method. It has a circuit with
以上説明したように、この発明による定電流回路によれ
ば、あらがじめ知、圧仙の異なったツェナーダイオード
を起動回路Ｑて用いることにょシ、起動後の電源電圧の
変８ｖこ対する安定度を向上させ、また製造工程でのツ
ェナーダイオードの定電圧値ノハラッキに対する安定度
をも向上させることで、極めて優れた定電流特性が得ら
れる〃ｌ尿力・ある。As explained above, according to the constant current circuit according to the present invention, it is possible to use Zener diodes with different voltages and pressures in the startup circuit Q, and to maintain stability against a change of 8 V in the power supply voltage after startup. By improving the stability of the Zener diode's constant voltage value during the manufacturing process, extremely excellent constant current characteristics can be obtained.
第１図は従来の定電流回路の一例を示す電気回路図、第
２図は本発明の一実施例による定電流回路の電気回路図
、第３図は第２図の定〜、流回路に使用される電圧値の
異なるツェナータイオードの電流−電圧特性図である。
（１１（２１（３１・・・トランジスタ、＋４１ （６
１・・・抵抗器、＋５１ ＋７１・・・ツェナーダイオ
ード、（８）・・・ダイオード、 ｆｉｇ＋・・・７Ｍ
電源端子
なお図中、同一符号は同−又は相当部分を示す。
代理人 葛 野 信 −Fig. 1 is an electric circuit diagram showing an example of a conventional constant current circuit, Fig. 2 is an electric circuit diagram of a constant current circuit according to an embodiment of the present invention, and Fig. 3 is an electric circuit diagram showing an example of a conventional constant current circuit. It is a current-voltage characteristic diagram of Zener diodes used with different voltage values. (11 (21 (31...transistor, +41 (6
1...Resistor, +51 +71...Zener diode, (8)...Diode, fig+...7M
In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno −
Claims (1)
スタと、電源端子にエミッタが接続されベースが上記第
１のトランジスタのベースに接続されタベース・コレク
ク短絡形の第２のトランジスタと、上記第１のトランジ
スタのコレクタにベースが接続され上記第２のトランジ
スタのコレクタにコレクタが接続された第３のトランジ
スタと、上記第３のトランジスタのエミッタと接地との
間に接続された第１の抵抗器と、一端が電源端子に接続
された第２の抵抗器と、上記第２の抵抗器の他端にアノ
ードが接続され上記第１のトランジスタのコレクタにカ
ソードが接続された整流素子と、上記弁士℃整流素子の
カソードと接地との間に接続された＠ ＋ ０１定電圧
素子と、上記整流素子のアノードと接地との間に接続さ
れた上記第１の定電圧素子の電圧値よりも電圧値の低い
第２の定電圧素子とを備えたことを特徴とする定電流回
路。(1) a first transistor whose emitter is connected to the power supply terminal; a second base-collection shorted transistor whose emitter is connected to the power supply terminal and whose base is connected to the base of the first transistor; a third transistor whose base is connected to the collector of the first transistor and whose collector is connected to the collector of the second transistor; and a first resistor connected between the emitter of the third transistor and ground. a second resistor having one end connected to a power supply terminal; a rectifying element having an anode connected to the other end of the second resistor and a cathode connected to the collector of the first transistor; ℃ The voltage value is higher than the voltage value of the @ + 01 constant voltage element connected between the cathode of the rectifying element and the ground, and the first constant voltage element connected between the anode of the rectifying element and the ground. A constant current circuit comprising: a second constant voltage element with a low voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57167253A JPS5955518A (en) | 1982-09-24 | 1982-09-24 | Constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57167253A JPS5955518A (en) | 1982-09-24 | 1982-09-24 | Constant current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5955518A true JPS5955518A (en) | 1984-03-30 |
Family
ID=15846297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57167253A Pending JPS5955518A (en) | 1982-09-24 | 1982-09-24 | Constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5955518A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01272306A (en) * | 1988-04-25 | 1989-10-31 | Sony Corp | Starting circuit for current source circuit |
| EP0414482A2 (en) * | 1989-08-22 | 1991-02-27 | Fujitsu Limited | Bias voltage supplying circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56135217A (en) * | 1980-02-22 | 1981-10-22 | Bosch Gmbh Robert | Voltage source |
-
1982
- 1982-09-24 JP JP57167253A patent/JPS5955518A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56135217A (en) * | 1980-02-22 | 1981-10-22 | Bosch Gmbh Robert | Voltage source |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01272306A (en) * | 1988-04-25 | 1989-10-31 | Sony Corp | Starting circuit for current source circuit |
| EP0414482A2 (en) * | 1989-08-22 | 1991-02-27 | Fujitsu Limited | Bias voltage supplying circuit |
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