JPH05250048A - Serial controlled voltage stablizer - Google Patents

Serial controlled voltage stablizer

Info

Publication number
JPH05250048A
JPH05250048A JP4839292A JP4839292A JPH05250048A JP H05250048 A JPH05250048 A JP H05250048A JP 4839292 A JP4839292 A JP 4839292A JP 4839292 A JP4839292 A JP 4839292A JP H05250048 A JPH05250048 A JP H05250048A
Authority
JP
Japan
Prior art keywords
voltage
current
output
zener
transistor
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.)
Withdrawn
Application number
JP4839292A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Ogata
芳幸 緒方
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP4839292A priority Critical patent/JPH05250048A/en
Publication of JPH05250048A publication Critical patent/JPH05250048A/en
Withdrawn legal-status Critical Current

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Landscapes

  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Power Conversion In General (AREA)

Abstract

PURPOSE:To suppress a Zener noise current, which flows in the input/output current of the serial controlled voltage stablizer by connecting a noise current controller serially to a Zener diode. CONSTITUTION:The base of a pass transistor 4 is controlled by the collector current of a drive transistor 5, and a voltage inputted to an input terminal 1 is serially controlled and defined as the output voltage of an output terminal 3. An error amplifier 7 compares a voltage resulting from dividing the output voltage by resistors 10 and 11 with a reference voltage from a reference voltage source 12 and supplies an error voltage through a resistor 9 to the base of the drive transistor 5. Although the emitter of the drive transistor 5 is level- shifted by a Zener diode 6, Zener noise generated by this diode 6 is limited by a current limiter 13 serially connected to the diode 6. Thus, the Zener noise current flowing in the input/output current of the serial controlled voltage stablizer is suppressed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は直列制御形電圧安定化器
に関し、特に駆動用トランジスタのエミッタにエミッタ
レベルをシフトするツェナーダイオードを接続した直列
制御形電圧安定化器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a series control type voltage stabilizer, and more particularly to a series control type voltage stabilizer in which a zener diode for shifting the emitter level is connected to the emitter of a driving transistor.

【0002】[0002]

【従来の技術】従来のこの種の直列制御形電圧安定化器
について図3の回路図を参照して説明する。
2. Description of the Related Art A conventional series control type voltage stabilizer of this type will be described with reference to the circuit diagram of FIG.

【0003】この直列制御形電圧安定化器は、コレクタ
が電源の入力端1に接続され、エミッタが出力端3に接
続されたパストランジスタ4を有している。パストラン
ジスタ4のベース電流は抵抗器8を介した駆動用トラン
ジスタ5のコレクタ電流によって制御され、駆動用トラ
ンジスタ5のエミッタ電位はツェナーダイオード6によ
ってシフトされる。また、出力端3の電圧が抵抗器10
および11によって分圧され、この分圧電圧が誤差増幅
器7の入力端の一方に供給される。さらに、基準電圧源
12からの予め定めた基準電圧が上記誤差増幅器7の他
方の入力端に供給され、誤差増幅器7はこれら分圧電圧
と基準電圧とを比較しこの比較結果の電圧を抵抗器9を
介して駆動用トランジスタ5のベースに供給する。
This series-controlled voltage stabilizer has a pass transistor 4 whose collector is connected to the input 1 of the power supply and whose emitter is connected to the output 3. The base current of the pass transistor 4 is controlled by the collector current of the driving transistor 5 via the resistor 8, and the emitter potential of the driving transistor 5 is shifted by the Zener diode 6. In addition, the voltage of the output terminal 3 is the resistor 10
The voltage is divided by 11 and 11, and the divided voltage is supplied to one of the input terminals of the error amplifier 7. Further, a predetermined reference voltage from the reference voltage source 12 is supplied to the other input terminal of the error amplifier 7, the error amplifier 7 compares the divided voltage with the reference voltage, and the voltage of the comparison result is a resistor. It is supplied to the base of the driving transistor 5 via 9.

【0004】図3の直列制御形電圧安定化器は、入力端
1の電圧を出力端2において予め定めた出力電圧に制御
するパストランジスタ4のコレクタ電圧を分圧し、この
分圧電圧と基準電圧とを誤差増幅器7の入力とし、比較
結果の誤差信号で駆動トランジスタ5を動作させ、トラ
ンジスタ5のコレクタから抵抗器8を介して供給される
パストランジスタ4のベース電流をコントロールし、出
力端3の出力電圧を安定化している。
The serial control type voltage stabilizer shown in FIG. 3 divides the collector voltage of the pass transistor 4 which controls the voltage at the input terminal 1 to a predetermined output voltage at the output terminal 2, and divides the divided voltage and the reference voltage. Are input to the error amplifier 7, the drive transistor 5 is operated by the error signal of the comparison result, the base current of the pass transistor 4 supplied from the collector of the transistor 5 through the resistor 8 is controlled, and the output terminal 3 The output voltage is stabilized.

【0005】なお、図3の安定化器における誤差増幅器
7の最小出力電圧は0でなくデッドロスが1〜2vある
ため、駆動トランジスタ5のエミッタにツェナーダイオ
ード6を接続し、エミッタ電圧のレベルシフトを行って
いる。さらに、この安定化器は、ツェナーダイオード6
の接続により、入力端1への入力電圧が予め定められた
入力電圧以下では、出力を生じないという機能が付加さ
れている。
Since the minimum output voltage of the error amplifier 7 in the stabilizer of FIG. 3 is not 0 and the dead loss is 1 to 2 v, the Zener diode 6 is connected to the emitter of the drive transistor 5 to shift the level of the emitter voltage. Is going. In addition, this stabilizer uses a Zener diode 6
The connection is added so that the output is not generated when the input voltage to the input terminal 1 is equal to or lower than the predetermined input voltage.

【0006】[0006]

【発明が解決しようとする課題】上述した従来の直列制
御形電圧安定化器では、微少なツェナーノイズがツェナ
ーダイオードに生ずるが、このツェナーノイズがパスト
ランジスタのベース電流に重畳され、さらにツェナーノ
イズのhF E 倍のノイズ電流がパストランジスタのコレ
クタ電流およびエミッタ電流となる。したがってこの直
列制御形電圧安定化器の入力端に生じる入力電流または
出力端に生じる出力電流にランダムなノイズが発生する
という欠点があった。
In the above-mentioned conventional series control type voltage stabilizer, a slight Zener noise is generated in the Zener diode. However, this Zener noise is superimposed on the base current of the pass transistor, and the Zener noise is further reduced. The noise current that is h FE times becomes the collector current and the emitter current of the pass transistor. Therefore, there is a drawback that random noise occurs in the input current generated at the input terminal or the output current generated at the output terminal of this series control type voltage stabilizer.

【0007】[0007]

【課題を解決するための手段】本発明の直列制御形電圧
安定化器は、コレクタが電源の入力端に接続されエミッ
タが出力端に接続されたパストランジスタと、コレクタ
電流によって前記パストランジスタのベース電流を制御
する駆動用トランジスタと、前記駆動用トランジスタの
エミッタ電位をシフトさせるツェナーダイオードと、前
記出力端の電圧に対応する出力対応電圧と予め定めた基
準電圧とを比較しこの比較結果の電圧を前記駆動用トラ
ンジスタのベースに供給する誤差増幅器とを有する直列
制御形電圧安定化器において、前記直列制御形電圧安定
化器が、さらに、前記ツェナーダイオードに流れる電流
を制限する電流制限器を備えている。
A series control type voltage stabilizer according to the present invention comprises a pass transistor having a collector connected to an input terminal of a power supply and an emitter connected to an output terminal, and a base of the pass transistor by a collector current. A driving transistor for controlling the current, a Zener diode for shifting the emitter potential of the driving transistor, an output corresponding voltage corresponding to the voltage of the output terminal and a predetermined reference voltage are compared, and the voltage of this comparison result is compared. A series control type voltage stabilizer having an error amplifier supplied to the base of the driving transistor, wherein the series control type voltage stabilizer further comprises a current limiter for limiting a current flowing through the Zener diode. There is.

【0008】[0008]

【実施例】次に本発明について図面を参照して説明す
る。
The present invention will be described below with reference to the drawings.

【0009】図1は本発明の第1の実施例の回路図であ
る。この直列制御形電圧安定化器は、図3に示した従来
技術の直列制御形電圧安定化器に加え、ツェナーダイオ
ード6のアノードに直列に電源制限器13の一端を接続
し、電源制限器13の他端を接地している。この回路に
おいて、ツェナーダイオード6のツェナーノイズは、電
流制限器13により電流制限され、従って駆動トランジ
スタ5のエミッタに供給されるノイズが減少する。
FIG. 1 is a circuit diagram of a first embodiment of the present invention. This series control type voltage stabilizer has, in addition to the conventional series control type voltage stabilizer shown in FIG. 3, one end of a power source limiter 13 connected in series to the anode of the Zener diode 6, and the power source limiter 13 The other end is grounded. In this circuit, the Zener noise of the Zener diode 6 is current limited by the current limiter 13, so that the noise supplied to the emitter of the drive transistor 5 is reduced.

【0010】図2は本発明の第2の実施例の回路図であ
り、図1の実施例における電流制限器13に抵抗器13
Aを用いている。この直列制御形電圧安定化器において
は、抵抗器13Aをツェナーダイオード6に直列に接続
しているので、ツェナーノイズが発生するとトランジス
タ5のエミッタ電圧は、ツェナーノイズ電流×抵抗器1
3の抵抗値だけ電圧上昇する。するとトランジスタ5の
ベース・エミッタ間電圧が小さくなり、トランジスタ5
のコレクタ電流を小さくしようと働く。つまり、ツェナ
ーノイズ電流が生じた分、パストランジスタ4のベース
電流であるトランジスタ5のコレクタ電流が抑圧され
る。したがってパストランジスタ4のコレクタ電流およ
びエミッタ電流,即ち、出力端1に生じる出力電流およ
び入力端3に生じる入力電流のノイズを低減できる。
FIG. 2 is a circuit diagram of the second embodiment of the present invention. The current limiter 13 and the resistor 13 in the embodiment of FIG.
A is used. In this series control type voltage stabilizer, the resistor 13A is connected in series with the Zener diode 6, so that when Zener noise occurs, the emitter voltage of the transistor 5 is equal to Zener noise current × resistor 1
The voltage increases by the resistance value of 3. Then, the base-emitter voltage of the transistor 5 becomes small, and the transistor 5
Works to reduce the collector current of. That is, the collector current of the transistor 5, which is the base current of the pass transistor 4, is suppressed by the amount of the Zener noise current generated. Therefore, the collector current and the emitter current of the pass transistor 4, that is, the noise of the output current generated at the output terminal 1 and the noise of the input current generated at the input terminal 3 can be reduced.

【0011】[0011]

【発明の効果】以上説明したように本発明は、ツェナー
ダイオードと直列にノイズ電流制御器(例えば抵抗器)
を接続することにより、ツェナーノイズ電流を抑圧する
ことができ、直列制御形電圧安定化器の入出力電流にツ
ェナーダイオードのノイズ電流が流れないようにするこ
とができるという効果がある。従って本直列制御形安定
器は、この回路の前段又は後段に接続される回路の誤動
作を防止でき、この安定化器を用いて装置の電磁適合性
が向上するという効果があるので装置の高信頼度が実現
でき、電子通信機器の分野で益するところが大である。
As described above, according to the present invention, the noise current controller (eg, resistor) is connected in series with the Zener diode.
By connecting with, the Zener noise current can be suppressed, and the noise current of the Zener diode can be prevented from flowing in the input / output current of the series control type voltage stabilizer. Therefore, this series control type ballast can prevent the malfunction of the circuit connected to the preceding stage or the latter stage of this circuit, and has the effect of improving the electromagnetic compatibility of the device by using this stabilizer. It is possible to achieve a high degree, and it has a great advantage in the field of electronic communication equipment.

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

【図1】本発明の第1の実施例の回路図である。FIG. 1 is a circuit diagram of a first embodiment of the present invention.

【図2】本発明の第2の実施例の回路図である。FIG. 2 is a circuit diagram of a second embodiment of the present invention.

【図3】従来の直列制御形電圧安定化器の回路図であ
る。
FIG. 3 is a circuit diagram of a conventional series control type voltage stabilizer.

【符号の説明】[Explanation of symbols]

1 入力端 3 出力端 4 パストランジスタ 5 駆動トランジスタ 6 ツェナーダイオード 7 誤差増幅器 8〜11,13A 抵抗器 12 基準電圧源 13 電流制限器 1 Input Terminal 3 Output Terminal 4 Pass Transistor 5 Driving Transistor 6 Zener Diode 7 Error Amplifier 8-11, 13A Resistor 12 Reference Voltage Source 13 Current Limiter

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 コレクタが電源の入力端に接続されエミ
ッタが出力端に接続されたパストランジスタと、コレク
タ電流によって前記パストランジスタのベース電流を制
御する駆動用トランジスタと、前記駆動用トランジスタ
のエミッタ電位をシフトさせるツェナーダイオードと、
前記出力端の電圧に対応する出力対応電圧と予め定めた
基準電圧とを比較しこの比較結果の電圧を前記駆動用ト
ランジスタのベースに供給する誤差増幅器とを有する直
列制御形電圧安定化器において、前記直列制御形電圧安
定化器が、さらに、前記ツェナーダイオードに流れる電
流を制限する電流制限器を備えることを特徴とする直列
制御形電圧安定化器。
1. A pass transistor having a collector connected to an input end of a power supply and an emitter connected to an output end, a drive transistor for controlling a base current of the pass transistor by a collector current, and an emitter potential of the drive transistor. Zener diode that shifts
In a serial control type voltage stabilizer having an output amplifier voltage corresponding to the voltage of the output terminal and a predetermined reference voltage, and an error amplifier which supplies the voltage of the comparison result to the base of the driving transistor, The series control type voltage stabilizer further comprises a current limiter for limiting a current flowing through the Zener diode.
JP4839292A 1992-03-05 1992-03-05 Serial controlled voltage stablizer Withdrawn JPH05250048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4839292A JPH05250048A (en) 1992-03-05 1992-03-05 Serial controlled voltage stablizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4839292A JPH05250048A (en) 1992-03-05 1992-03-05 Serial controlled voltage stablizer

Publications (1)

Publication Number Publication Date
JPH05250048A true JPH05250048A (en) 1993-09-28

Family

ID=12802027

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4839292A Withdrawn JPH05250048A (en) 1992-03-05 1992-03-05 Serial controlled voltage stablizer

Country Status (1)

Country Link
JP (1) JPH05250048A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998021811A1 (en) * 1996-11-15 1998-05-22 Thomson Consumer Electronics, Inc. Fault control circuit for switched power supply
US8013582B2 (en) 2007-10-10 2011-09-06 Oki Semiconductor Co., Ltd. Voltage control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998021811A1 (en) * 1996-11-15 1998-05-22 Thomson Consumer Electronics, Inc. Fault control circuit for switched power supply
US8013582B2 (en) 2007-10-10 2011-09-06 Oki Semiconductor Co., Ltd. Voltage control circuit

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Legal Events

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Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990518