JPH0625941B2 - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPH0625941B2
JPH0625941B2 JP25097184A JP25097184A JPH0625941B2 JP H0625941 B2 JPH0625941 B2 JP H0625941B2 JP 25097184 A JP25097184 A JP 25097184A JP 25097184 A JP25097184 A JP 25097184A JP H0625941 B2 JPH0625941 B2 JP H0625941B2
Authority
JP
Japan
Prior art keywords
output
transistor
current
circuit
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.)
Expired - Lifetime
Application number
JP25097184A
Other languages
Japanese (ja)
Other versions
JPS61128307A (en
Inventor
尚稔 東山
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
Nippon 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 Nippon Electric Co Ltd filed Critical Nippon Electric Co Ltd
Priority to JP25097184A priority Critical patent/JPH0625941B2/en
Publication of JPS61128307A publication Critical patent/JPS61128307A/en
Publication of JPH0625941B2 publication Critical patent/JPH0625941B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/468Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電源回路に関し特に消費電流の少い電源回路に
関するものである。
The present invention relates to a power supply circuit, and more particularly to a power supply circuit with low current consumption.

〔従来の技術〕[Conventional technology]

従来の電源回路は第3図に示すように、電源供給ライン
1に供給される電圧から抵抗9と定電圧素子10とが直
列接続された第1の基準電圧源11で第1の基準電圧を
作り、この第1の基準電圧を利用してトランジスタ1
2,13,14,15,16,抵抗17,18,19,
20,定電圧素子21で構成される第2の基準電圧源2
2から、トランジスタ16のエミッタを出力部として第
2の基準電圧を得、この第2の基準電圧で出力回路23
を制御して出力端子30と接地ライン29との間に定電
圧の出力Voを得ている。出力回路23は電流増幅器2
4と出力トランジスタ25と定電流源31とからなって
おり、電流増幅器24を構成するトランジスタ27のベ
ースに第2の基準電圧を与え、エミッタから出力トラン
ジスタ25のベースに制御信号を与えている。トランジ
スタ25のエミッタ出力が出力端子30に導出される。
定電流源31はトランジスタ26、抵抗28で構成され
ている。更に、出力回路23の導通、非導通を制御する
制御回路40を備えており、この制御回路40は、トラ
ンジスタ42〜50、抵抗51〜56及び定電圧素子5
7から成り外部端子58に印加される電圧Vcにより、
トランジスタ50が導通・非導通となる事によって、出
力トランジスタ25の動作を制御し、出力端子30への
定電圧出力Voの発生を任意に制御している。
In the conventional power supply circuit, as shown in FIG. 3, the first reference voltage source 11 in which the resistor 9 and the constant voltage element 10 are connected in series is used to generate the first reference voltage from the voltage supplied to the power supply line 1. Make and use this first reference voltage for transistor 1
2, 13, 14, 15, 16, resistors 17, 18, 19,
20, a second reference voltage source 2 composed of a constant voltage element 21
2, the second reference voltage is obtained by using the emitter of the transistor 16 as an output section, and the output circuit 23 is supplied with the second reference voltage.
Is controlled to obtain a constant voltage output Vo between the output terminal 30 and the ground line 29. The output circuit 23 is the current amplifier 2
4, the output transistor 25, and the constant current source 31. The second reference voltage is applied to the base of the transistor 27 forming the current amplifier 24, and the control signal is applied from the emitter to the base of the output transistor 25. The emitter output of the transistor 25 is led to the output terminal 30.
The constant current source 31 is composed of a transistor 26 and a resistor 28. Further, a control circuit 40 for controlling conduction / non-conduction of the output circuit 23 is provided, and the control circuit 40 includes the transistors 42 to 50, the resistors 51 to 56, and the constant voltage element 5.
By the voltage Vc which is composed of 7 and is applied to the external terminal 58,
By turning the transistor 50 on and off, the operation of the output transistor 25 is controlled, and the generation of the constant voltage output Vo to the output terminal 30 is arbitrarily controlled.

〔発明が解決しようとする問題点〕[Problems to be solved by the invention]

上述した従来の回路例では、制御回路40を外部端子5
8の電位によって出力電圧Voの発生を制御できるが、
出力回路23が出力電圧Voを生じないように制御され
た場合でも、他の回路は動作しており、特に比較的大き
な電流の定電流源31が接続された電流増幅器24も動
作状態のままなので、出力を必要としない時にも無駄に
消費される回路電流が大きいという欠点があった。
In the above-described conventional circuit example, the control circuit 40 is connected to the external terminal 5
Although the generation of the output voltage Vo can be controlled by the potential of 8,
Even when the output circuit 23 is controlled so as not to generate the output voltage Vo, the other circuits are operating and the current amplifier 24 to which the constant current source 31 having a relatively large current is connected is still in the operating state. However, there is a drawback that the circuit current that is wastefully consumed is large even when the output is not required.

〔問題点を解決するための手段〕[Means for solving problems]

本発明では電源回路に出力が生じないようにした時、同
時に基準電圧を電流増幅して出力トランジスタを駆動す
る電流増幅器に定電流を流し込む定電流源を不動作状態
に制御するもので、電源供給ラインに出力トランジスタ
のコレクタを接続し、この出力トランジスタのベースに
基準電圧源からの出力を電流増幅する電流増幅器の出力
を接続し、出力トランジスタのエミッタから定電圧の出
力を得る電源回路に於て、出力トランジスタは制御信号
によってエミッタに定電圧出力を生じないように制御さ
れており、更に電流増幅器は定電流源からの出力定電流
で駆動されており、前述の制御信号によって前述の定電
圧出力が生じない時同時に定電流源から出力定電流が生
じないように制御されている電源回路を得る。
According to the present invention, when no output is generated in the power supply circuit, the constant current source that simultaneously amplifies the reference voltage by current amplification and supplies a constant current to the current amplifier that drives the output transistor is controlled in an inactive state. In the power supply circuit, the collector of the output transistor is connected to the line, the output of the current amplifier that current-amplifies the output from the reference voltage source is connected to the base of the output transistor, and the constant voltage output is obtained from the emitter of the output transistor. The output transistor is controlled by the control signal so that the constant voltage output is not generated at the emitter, and the current amplifier is driven by the constant current output from the constant current source. The constant voltage output is controlled by the control signal. At the same time, a power supply circuit controlled so that an output constant current is not generated from the constant current source is obtained.

〔実施例〕〔Example〕

次に、図面を参照して本発明をより詳細に説明する。 The present invention will now be described in more detail with reference to the drawings.

第1図は本発明の一実施例を示したものである。従来例
と同一機能の部分には同一番号を付している。第1図で
は新たに電源供給ライン1からトランジスタ2,抵抗
3,4と外部端子5に接続されたコンデンサー6とでフ
ィルター7を構成している。このフィルター7によって
電源供給ライン1からの電源をリップル分を除去して第
2の電源供給ライン8に出力して第1の基準電圧源11
と制御回路40に電源供給を行っている。特に電源供給
ライン1に重畳されている電源リップル分をフィルター
7で平滑している為、出力回路23の出力端子30に現
われるリップル分を抵抗4とコンデンサー6のインピー
ダンス比で減衰している。このため第1の基準電圧源1
1の出力に生じるリップル分を著るしく減少し、出力端
子30の定電圧出力Voの電圧変動率を著しく小さくし
ている。さらに、定電流源31は第1の基準電圧源11
を基準とし、トランジスタ150のベースに与え、トラ
ンジスタ150コレクタにトランジスタ150と154
および抵抗152で定電流が決定される様にしている。
トランジスタ154はスイッチ・トランジスタでそのベ
ースには、制御回路40内のトランジスタ42と43と
を主トランジスタとする比較器の一方の負荷のトランジ
スタ155からトランジスタ156、抵抗157を介し
て導通・非導通が制御される様にしている。
FIG. 1 shows an embodiment of the present invention. The parts having the same functions as those of the conventional example are given the same numbers. In FIG. 1, a filter 7 is newly composed of a transistor 2, resistors 3 and 4 from a power supply line 1 and a capacitor 6 connected to an external terminal 5. The filter 7 removes the ripple component of the power from the power supply line 1 and outputs it to the second power supply line 8 to output the first reference voltage source 11
And power supply to the control circuit 40. In particular, since the power ripple component superimposed on the power supply line 1 is smoothed by the filter 7, the ripple component appearing at the output terminal 30 of the output circuit 23 is attenuated by the impedance ratio of the resistor 4 and the capacitor 6. Therefore, the first reference voltage source 1
The ripple component generated in the output of No. 1 is remarkably reduced, and the voltage fluctuation rate of the constant voltage output Vo of the output terminal 30 is significantly reduced. Further, the constant current source 31 is the first reference voltage source 11
Is given to the base of the transistor 150, and the collectors of the transistor 150 are connected to the transistors 150 and 154.
Also, the constant current is determined by the resistor 152.
The transistor 154 is a switch transistor, and at its base, conduction / non-conduction through the transistor 155, which is one load of the comparator having the transistors 42 and 43 in the control circuit 40 as main transistors, through the transistor 156 and the resistor 157. It is controlled.

この様な回路形式によって、出力回路23の制御を行う
トランジスタ50の動作とスイッチ・トランジスタ15
4の動作とが同期し出力回路23から出力を生じない時
には同時に電流増幅器24に供給される定電流も定電流
源31から生じないようにしている。本実施例の場合は
トランジスタ50が導通することによって出力定電圧を
生じないようにし、トランジスタ154が非導通となる
ことによって定電流源31から定電流が生じないように
している。
With such a circuit format, the operation of the transistor 50 for controlling the output circuit 23 and the switch transistor 15
4 does not generate an output from the output circuit 23 at the same time, the constant current supplied to the current amplifier 24 is also prevented from the constant current source 31. In the case of this embodiment, the output constant voltage is prevented from being generated by the transistor 50 being conductive, and the constant current is not generated from the constant current source 31 by the transistor 154 being non-conductive.

第2図に制御回路40の入力端子58の入力電圧Vc,
トランジスタ50,トランジスタ154,電源供給ライ
ン1及び2,出力端子電圧Vo及び回路電流Iccの動
作タイミング・チャートを示す。Aの領域は電源供給ラ
イン1に電源が与えられていない時で、Bの領域は電源
供給ライン1に電源が与えられているが、制御回路40
の入力電圧Vcが低レベルの状態で出力Voは生じてお
らず回路電流(Icc)が、スタンバイ状態の時を示し
ている。Cの領域は、制御回路40の入力電圧Vcが高
レベルで出力Voが生じている動作状態を示している。
Dの領域は、Cの状態から制御回路40の入力電圧Vc
を低レベルにして再びスタンバイ状態となっている時を
示したものである。Eの領域は電源供給ライン1に電源
が与えられていない時を示している。
FIG. 2 shows the input voltage Vc of the input terminal 58 of the control circuit 40,
An operation timing chart of the transistor 50, the transistor 154, the power supply lines 1 and 2, the output terminal voltage Vo, and the circuit current Icc is shown. In the area A, the power is supplied to the power supply line 1, and in the area B, the power is supplied to the power supply line 1.
The output voltage Vo is not generated when the input voltage Vc is low and the circuit current (Icc) is in the standby state. A region C indicates an operating state in which the input voltage Vc of the control circuit 40 is at a high level and the output Vo is generated.
The region of D changes from the state of C to the input voltage Vc of the control circuit 40.
Is set to a low level and is in the standby state again. A region E indicates a time when power is not supplied to the power supply line 1.

本実施例によれば出力電圧Voを生じないようにした時
に電流増幅器に流し込む低電流源を出力回路の動作制御
に同期したスイッチで不動作とする事により回路電流の
無駄な消費が減少出来る。次に、これを従来例と比較し
て説明する。出力回路電流Io=1Aを得るためには電源を
得ようとすると出力トランジスタ25の直流hFEQ25の最
小を50とすると電流増幅器の低電流源Ic1としては
Ic1=Io/hFEQ25=1A/50=20mAが必要と
なる。その他の回路電流としては、定電圧回路の電流I
1=3mA基準電源及び制御回路の電流I2=1mAが必
要となる。今、従来のように定電流源スイッチを使用し
ない時には出力回路に出力が生じていない時でも回路電
流Icc1=I1+I2+Ic1=3mA+1mA+20mA
が消費される。このうち定電流源Ic1の電流が回路電
流Icc1に占る割合が非常に大きい。この電流は出力
回路電流を大きく得ようとすれば前述の式から必然的に
増加する値である。従って本実施例によれば定電流源ス
イッチを用いる事によって出力回路に出力が生じていな
い時の回路電流Icc1′をIcc1′=I1+I2=3m
A+1mAに減少でき、従来例の1/6に減少可能であ
る。
According to this embodiment, wasteful consumption of the circuit current can be reduced by disabling the low current source that flows into the current amplifier when the output voltage Vo is not generated by the switch synchronized with the operation control of the output circuit. Next, this will be described in comparison with a conventional example. Output circuit current Io = 1A in order to obtain Ic 1 = Io as low current source Ic 1 of minimizing When 50 current amplifier DC h FEQ25 output transistor 25 and is to be obtained the power / h FEQ25 = 1A / 50 = 20 mA is required. The other circuit current is the current I of the constant voltage circuit.
1 = 3 mA A current I 2 = 1 mA for the reference power supply and control circuit is required. Now, when the constant current source switch is not used as in the conventional case, the circuit current Icc 1 = I 1 + I 2 + Ic 1 = 3 mA + 1 mA + 20 mA even when no output is generated in the output circuit.
Is consumed. Of these, the ratio of the current of the constant current source Ic 1 to the circuit current Icc 1 is very large. This current is a value that inevitably increases from the above equation if a large output circuit current is to be obtained. Therefore, according to this embodiment, by using the constant current source switch, the circuit current Icc 1 ′ when no output is generated in the output circuit is Icc 1 ′ = I 1 + I 2 = 3 m
It can be reduced to A + 1 mA and can be reduced to 1/6 of the conventional example.

〔発明の効果〕〔The invention's effect〕

このように、本発明によれば出力を生じない時に無駄に
消費される電流を少くした電源回路を得ることができ
る。
As described above, according to the present invention, it is possible to obtain the power supply circuit in which the current consumed wastefully when the output is not generated is reduced.

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

第1図は本発明の一実施例を示す回路図、第2図は本発
明の一実施例の動作を説明するタイミングチャートであ
る。第3図は従来の電源回路の例を示す回路図である。 1,8……電源供給、5,30,58……端子、2,1
2,13,14,15,16,26,27,25,4
2,43,44,45,46,47,48,49,5
0,150,155,156,160……トランジス
タ、3,4,7,17,18,19,20,24,5
1,52,53,54,55,56,157,152,
153,28,9……抵抗、10,21,57……定電
圧素子、6……コンデンサ、7……フィルタ、24……
電流増幅器、31……定電流源、23……出力回路、1
1,22……定電圧回路、40……制御回路。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart for explaining the operation of the embodiment of the present invention. FIG. 3 is a circuit diagram showing an example of a conventional power supply circuit. 1,8 ... Power supply, 5,30,58 ... Terminals, 2,1
2,13,14,15,16,26,27,25,4
2,43,44,45,46,47,48,49,5
0,150,155,156,160 ... Transistor, 3,4,7,17,18,19,20,24,5
1, 52, 53, 54, 55, 56, 157, 152,
153, 28, 9 ... Resistance, 10, 21, 57 ... Constant voltage element, 6 ... Capacitor, 7 ... Filter, 24 ...
Current amplifier, 31 ... Constant current source, 23 ... Output circuit, 1
1, 22 ... Constant voltage circuit, 40 ... Control circuit.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】基準電圧源と,該基準電圧源の出力を電流
増幅する電流増幅器と,該電流増幅器に駆動電流を供給
する定電流源と,前記電流増幅器の出力を受けて定電圧
を出力する出力トランジスタと,該出力トランジスタの
オンオフを制御するために設けられた第1の制御トラン
ジスタと前記定電流源に駆動電流を供給するか否かを制
御する為に設けられた第2の制御トランジスタとを有
し,前記第1の制御トランジスタをオフし,かつ前記第
2の制御トランジスタをオンすることによって前記出力
トランジスタから定電圧出力を取り出す様にした電源回
路であって,前記第1の制御トランジスタと前記第2の
制御トランジスタとは互いに逆の関係になるようにそれ
らの動作状態を制御することを特徴とする電源回路。
1. A reference voltage source, a current amplifier for current-amplifying the output of the reference voltage source, a constant current source for supplying a drive current to the current amplifier, and a constant voltage for receiving the output of the current amplifier. Output transistor, a first control transistor provided to control ON / OFF of the output transistor, and a second control transistor provided to control whether to supply a drive current to the constant current source. And a first power supply circuit for taking out a constant voltage output from the output transistor by turning off the first control transistor and turning on the second control transistor. A power supply circuit, characterized in that the operating state of the transistor and the second control transistor are controlled so as to be in an inverse relationship to each other.
JP25097184A 1984-11-28 1984-11-28 Power supply circuit Expired - Lifetime JPH0625941B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25097184A JPH0625941B2 (en) 1984-11-28 1984-11-28 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25097184A JPH0625941B2 (en) 1984-11-28 1984-11-28 Power supply circuit

Publications (2)

Publication Number Publication Date
JPS61128307A JPS61128307A (en) 1986-06-16
JPH0625941B2 true JPH0625941B2 (en) 1994-04-06

Family

ID=17215747

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25097184A Expired - Lifetime JPH0625941B2 (en) 1984-11-28 1984-11-28 Power supply circuit

Country Status (1)

Country Link
JP (1) JPH0625941B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5181959B2 (en) * 2008-09-17 2013-04-10 ミツミ電機株式会社 DC power supply and semiconductor integrated circuit for power control

Also Published As

Publication number Publication date
JPS61128307A (en) 1986-06-16

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