JPH0496809A - Voltage switching constant current source - Google Patents
Voltage switching constant current sourceInfo
- Publication number
- JPH0496809A JPH0496809A JP21535290A JP21535290A JPH0496809A JP H0496809 A JPH0496809 A JP H0496809A JP 21535290 A JP21535290 A JP 21535290A JP 21535290 A JP21535290 A JP 21535290A JP H0496809 A JPH0496809 A JP H0496809A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- npn transistor
- constant current
- collector
- current source
- 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
- 230000007704 transition Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 1
- 241000270295 Serpentes Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Control Of Electrical Variables (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は半導体集積回路に於て利用される電源電圧が規
定電圧以上になった時、動作する電圧スイッチング定電
流源に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a voltage switching constant current source that operates when a power supply voltage used in a semiconductor integrated circuit exceeds a specified voltage.
（Ｘ￥の枝番を丁 従来の電圧スイッチング定電流源を第２図に示す。(Choose the branch number of A conventional voltage switching constant current source is shown in FIG.
この回路構成は、一端が電源端子］に接続された抵抗Ｒ
１の４＠端古接地端了２の間に［１個のン丁、ナーダイ
オート（Ｄｌ、Ｄ２．・・・・・・、Ｄｏ）を縦列接続
し、ツェナークイオードＤ。のカソードにｎ ｐ ｎ
ｈランシスタＱ１のベースを接続し、トランジスタＱ１
のエミッタに一端が接地端子２に接続された抵抗Ｒ２の
他端を接続し、）・ランンスタＱ１のコレクタに電流供
給端子３を接続したものである。This circuit configuration consists of a resistor R whose one end is connected to the power supply terminal.
Between the 4 terminals and the 2 terminals of 1 and 2, connect one diode diode (Dl, D2..., Do) in cascade, and form a Zener diode D. n p n at the cathode of
h Connect the base of transistor Q1 and connect transistor Q1
The other end of a resistor R2 whose one end is connected to the ground terminal 2 is connected to the emitter of ), and the current supply terminal 3 is connected to the collector of the run star Q1.
発明が解決しよろと−４る：１１８
しかし、従来の回路構成では各ツェナーダイオードの電
圧を〜・”Ｚ 、 ｎ １）ｎ トランジスタＱ１のヘ
ース・エミッタ間電圧を＼゛Ｂ２とずれば電源室ｒＬが
（ｎ−１）・ｖｚ＋〜’Ｂ［以−１−てｎ ｐ ｎ ｈ
ランシスタＱ１のコレクタより電流を供給し始め、ｒ〕
・〜”２以上でｎｐｎ トランジスタＱ１のコレクタ電
流は定電流となる。これにより、遷移領域はｖｚＶＢＥ
（’＝５．８−０．７＝５．１ ｖ）と広くなる。ま
た遷移領域でのトランジスタＱ１のコレクタ電流を■ヨ
トランジスタＱ１のコレクタ定電流をＩＯ，ｎｐｎ
）ランジスタＱ１の電流増幅率（ｈＦＥ）をｈＦＥｌ、
電源電圧をｖｃｃとするととなり、動作しきい値電圧の
設定が難しかった。118 However, in the conventional circuit configuration, the voltage of each Zener diode is ~. rL is (n-1)・vz+〜'B [therefore-1-then n p n h
Start supplying current from the collector of Lancistor Q1, r]
・~”2 or more, the collector current of the npn transistor Q1 becomes a constant current.Thereby, the transition region becomes vzVBE
('=5.8-0.7=5.1 v). Also, the collector current of transistor Q1 in the transition region is IO, npn
) The current amplification factor (hFE) of transistor Q1 is hFEl,
Assuming that the power supply voltage is vcc, it is difficult to set the operating threshold voltage.
課題を解決するための手段
本発明は電源端子と第１のｎｐｎ トランジスタのベー
ス間に１個の抵抗とｎ個のツェナーダイオードを直列に
接続し、前記第１のｎｐｎ トランジスタのベースにエ
ミッタが接地された第２のｎｐｎトランジスタのコレク
タを接続し、前記第１のｎｐｎトランジスタのエミッタ
に前記第２のｎｐｎトランジスタのベースと一端が接地
された第２の抵抗の他端子を接続し、前記第１のｎｐｎ
トランジスタのコレクタに電流供給端子を接続したも
のである。Means for Solving the Problems The present invention connects one resistor and n Zener diodes in series between a power supply terminal and the base of a first NPN transistor, and connects an emitter to the base of the first NPN transistor. The collector of the second npn transistor is connected to the emitter of the first npn transistor, and the other terminal of a second resistor whose one end is grounded is connected to the base of the second npn transistor. npn of
A current supply terminal is connected to the collector of the transistor.
作用
第１のｎｐｎ トランジスタのベース電圧を第１と第２
のｎｐｎ トランジスタのそれぞれのベース・エミッタ
間電圧ＶＢＥＩとＶ ＢＦ２（ただし〜’ＢＥｌ−ＶＢ
Ｅ２＝ＶＢＥとする）で決定することにより電源電圧Ｖ
ｃｃがｎ−Ｖｚ ＋ ＶＢＨ以上で第１のｎｐｎトラン
ジスタのコレクタより電流を供給し始め、ｎ・ｖＺ＋２
ＶＢｐ以上で第１のｎｐｎ トランジスタのコレクタ電
流は定電流となる。これにより遷移領域をＶＢＥ （ζ
０．７ｖ）と狭くすることができる。The base voltage of the first npn transistor is
The base-emitter voltages VBEI and VBF2 of each npn transistor (where ~'BEl-VB
E2=VBE), the power supply voltage V
When cc is equal to or higher than n-Vz + VBH, current starts to be supplied from the collector of the first npn transistor, and n・vZ+2
Above VBp, the collector current of the first npn transistor becomes a constant current. This makes the transition region VBE (ζ
0.7v).
実施例
第１図は本発明の電圧スイッチング定電流源の実施例を
示す回路図である。Embodiment FIG. 1 is a circuit diagram showing an embodiment of the voltage switching constant current source of the present invention.
この回路は、電源端子１とｎｐｎ トランジスタＱ１の
ベースとの間に、抵抗Ｒ１とｎ個のツェナーダイオード
ＤＩ 、 Ｄ２ 、・・・・・・、Ｄｏを直列接続し
、ｎｐｎ トランジスタＱ１のベースと接続端子２の間
にｎｐｎ トランジスタＱ２を接続し、ｎｐｎ トラン
ジスタＱ１のエミッタをｎｐｎ トランジスタＱ２の／
＼−スと一端が接地端子２に接続された抵抗Ｒ２の他端
に接続し、ｎｐｎ トランジスタＱ１のコレクタを電流
供給端子３に接続した構成である。。In this circuit, a resistor R1 and n Zener diodes DI, D2, . . . , Do are connected in series between power supply terminal 1 and the base of an npn transistor Q1. An npn transistor Q2 is connected between terminals 2, and the emitter of the npn transistor Q1 is connected to the emitter of the npn transistor Q2.
The configuration is such that the terminal is connected to the other end of a resistor R2 whose one end is connected to the ground terminal 2, and the collector of the npn transistor Q1 is connected to the current supply terminal 3. .
ツェナーダイオードの電圧をｖｚ、ｎｐｎトランジスタ
Ｑ１とＱ２のベース・エミッタ間電圧をＶＢＥＩとＶＢ
Ｅ２（ただしＶＢＥＩ ” ＶＢＥ２−ＶＢＥとする）
、ｎｐｎｈランシスタＱ１とＱ２のｈＦＥをｈ ＦＥＩ
、 ｈ ＦＥ：、遷移領域でのｎｐｎ トランジスタ
Ｑ１のコレクタ電流を１．、ｎｐｎトランジスタＱ１の
コレクタ定電流領域での電流を１゜、電源電圧をＶＣＣ
とすると
ｎ ６ＶＺ＋ＶＢＥｌ＜ＶＣＣ＜ｎ １ＶＺ ＋ＶＢＥ
ｌ＋ＶＢＥ２の遷移領域で
でｉ）す、スイッチングの遷移領域は〜ＢＥ（＃ ０
、７ ｖ Ｉと狭く、動作しきい値電圧の設定が容易と
なる。The voltage of the Zener diode is vz, and the voltage between the base and emitter of npn transistors Q1 and Q2 is VBEI and VB.
E2 (however, VBEI "VBE2-VBE")
, hFEI of npnh run transistors Q1 and Q2
, h FE:, the collector current of the npn transistor Q1 in the transition region is set to 1. , the current in the collector constant current region of the npn transistor Q1 is 1°, and the power supply voltage is VCC.
Then n 6VZ + VBEl<VCC<n 1VZ +VBE
In the transition region of l+VBE2 i), the switching transition region is ~BE(# 0
, 7 v I, making it easy to set the operating threshold voltage.
発明の効果
本発明によれば、遷移領域の狭い電圧スイッチング定電
流源が容易に実現でき、動作しきい値電圧の設定を容易
にすることができる。Effects of the Invention According to the present invention, a voltage switching constant current source with a narrow transition region can be easily realized, and the operating threshold voltage can be easily set.
第１図は本発明の電圧スイッチング定電流源の実施例を
示す回路図、第２図は従来例の回路図である。
ｌ・・・・・電＃、端子、２・・・・・・接地端子、３
・・・・・電流供給端子、Ｄ１〜Ｄ ｎ・・・ツェナー
ダイオード、Ｑ １ 、 Ｑ２−−・・ｎ ｐ ｎ ト
ランジスタ、Ｒ１，Ｒ２・・・抵抗。
代理人の氏名 弁理士 粟野重孝 はか１名Ｖｃｃ＞
ｎ−Ｖｚ＋ ＶＢＥＩ ＋ＶＢＥ２の定電流領域で！
・
３・
Ｄ１〜Ｄｎ
Ｏｔ、（ｈ
Ｒｔ、Ｒ２
電漁籍子
＄Ｉ蛇ｊ島手
電流供綿嬶ヰ
１ツエナーダイオード
ｎｐｎ ｌ−ランシスタ
担抗FIG. 1 is a circuit diagram showing an embodiment of the voltage switching constant current source of the present invention, and FIG. 2 is a circuit diagram of a conventional example. l...Electrical number, terminal, 2...Ground terminal, 3
...Current supply terminal, D1-Dn...Zener diode, Q1, Q2--...npn transistor, R1, R2...resistance. Name of agent: Patent attorney Shigetaka Awano, 1 person Vcc>
In the constant current region of n-Vz+ VBEI +VBE2!
・ 3. D1~Dn Ot, (h Rt, R2 electric fishing register $I snake j Shimate current supply cotton 1 Zener diode npn l-lansistor support
Claims (1)
ｎｐｎトランジスタのベース間に、ｎ個のツェナーダイ
オードを縦列接続し、前記第１のｎｐｎトランジスタの
ベースにエミッタが接地された第２のｎｐｎトランジス
タのコレクタを接続し、前記第１のｎｐｎトランジスタ
のエミッタに前記第２のｎｐｎトランジスタのベースと
一端が接地された第２の抵抗の他端を接続し、前記第１
のｎｐｎトランジスタのコレクタに電流供給端子を接続
したことを特徴とする電圧スイッチング定電流源。n Zener diodes are connected in series between the other end of a first resistor whose one end is connected to the power supply terminal and the base of the first npn transistor, and their emitters are grounded to the base of the first npn transistor. The collector of the second npn transistor is connected to the emitter of the first npn transistor, the other end of the second resistor whose one end is grounded is connected to the base of the second npn transistor, and the other end of the second resistor is connected to the emitter of the first npn transistor.
A voltage switching constant current source characterized in that a current supply terminal is connected to the collector of an npn transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21535290A JPH0496809A (en) | 1990-08-14 | 1990-08-14 | Voltage switching constant current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21535290A JPH0496809A (en) | 1990-08-14 | 1990-08-14 | Voltage switching constant current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0496809A true JPH0496809A (en) | 1992-03-30 |
Family
ID=16670878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21535290A Pending JPH0496809A (en) | 1990-08-14 | 1990-08-14 | Voltage switching constant current source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0496809A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100756093B1 (en) * | 2000-03-13 | 2007-09-05 | 피시아 밥콕 엔비론멘트 게엠베하 | Fluid-cooled central beam elements for the multi-rail combustion stoker and central beam |
-
1990
- 1990-08-14 JP JP21535290A patent/JPH0496809A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100756093B1 (en) * | 2000-03-13 | 2007-09-05 | 피시아 밥콕 엔비론멘트 게엠베하 | Fluid-cooled central beam elements for the multi-rail combustion stoker and central beam |
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