JP3180383B2 - Series regulator - Google Patents

Series regulator

Info

Publication number
JP3180383B2
JP3180383B2 JP28333191A JP28333191A JP3180383B2 JP 3180383 B2 JP3180383 B2 JP 3180383B2 JP 28333191 A JP28333191 A JP 28333191A JP 28333191 A JP28333191 A JP 28333191A JP 3180383 B2 JP3180383 B2 JP 3180383B2
Authority
JP
Japan
Prior art keywords
output
circuit
current
error amplifier
terminal
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 - Fee Related
Application number
JP28333191A
Other languages
Japanese (ja)
Other versions
JPH05119855A (en
Inventor
敬人 内田
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 JP28333191A priority Critical patent/JP3180383B2/en
Publication of JPH05119855A publication Critical patent/JPH05119855A/en
Application granted granted Critical
Publication of JP3180383B2 publication Critical patent/JP3180383B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

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、シリーズレギュレータ
の制御回路の構成に関し、特に、軽負荷時に高効率化を
はかることができるシリーズレギュレータに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a control circuit of a series regulator, and more particularly to a series regulator capable of achieving high efficiency at light load.

【0002】[0002]

【従来の技術】従来のシリーズレギュレータは、図3に
示すように、入力コンデンサ1と、出力側に電流を供給
する出力トランジスタ2と、基準電圧、出力電圧、およ
び基準電圧の偏差を増幅し出力トランジスタ2のベース
電流を制御する誤差増幅器3と、この誤差増幅器3の出
力を出力トランジスタ2を駆動するのに必要な電流に増
幅する駆動回路4と、出力コンデンサ5とを備える。
2. Description of the Related Art As shown in FIG. 3, a conventional series regulator includes an input capacitor 1, an output transistor 2 for supplying a current to an output side, a reference voltage, an output voltage, and a deviation of the reference voltage. An error amplifier 3 for controlling a base current of the transistor 2, a drive circuit 4 for amplifying an output of the error amplifier 3 to a current necessary for driving the output transistor 2, and an output capacitor 5 are provided.

【0003】[0003]

【発明が解決しようとする課題】上述した従来のシリー
ズレギュレータの制御回路は、出力電流の大小にかかわ
らず基準電圧端子、誤差増幅器、および駆動回路に一定
の電流を供給しなければならないために、出力電流が非
常に小さいときは制御回路の電流が目立つようになり効
率が大幅に低下してしまう問題があった。
The control circuit of the conventional series regulator described above must supply a constant current to the reference voltage terminal, the error amplifier, and the drive circuit regardless of the magnitude of the output current. When the output current is very small, there is a problem that the current of the control circuit becomes conspicuous and the efficiency is greatly reduced.

【0004】本発明はこのような問題を解決するもの
で、軽負荷時において効率を向上させることができるシ
リーズレギュレータを提供することを目的とする。
An object of the present invention is to solve such a problem, and an object of the present invention is to provide a series regulator capable of improving the efficiency at a light load.

【0005】[0005]

【課題を解決するための手段】本発明は、入力端子と、
出力端子と、この出力端子の出力電圧と基準電圧
(Es )との誤差を検出する誤差増幅器と、前記入力端
子と出力端子との間に直列接続された出力トランジスタ
と、この誤差増幅器の出力にしたがって駆動され前記出
力トランジスタの制御電極を制御する駆動回路とを備え
たシリーズレギュレータにおいて、前記出力端子の電流
を検出する電流検出抵抗と、この電流検出抵抗により検
出された電流値が規定値より小さいときに出力を送出す
る間欠動作制御回路と、この間欠動作制御回路の出力に
より駆動される発振回路と、この発振回路の発振出力に
より開閉されるスイッチ回路とを設け、前記誤差増幅器
の電源電流通路にこのスイッチ回路が挿入されたことを
特徴とする。
The present invention comprises an input terminal,
An output terminal, an error amplifier for detecting an error between an output voltage of the output terminal and a reference voltage (E s ), an output transistor connected in series between the input terminal and the output terminal, and an output of the error amplifier. A current detection resistor for detecting the current of the output terminal, and a current value detected by the current detection resistor being greater than a specified value. An intermittent operation control circuit that sends an output when the output is small; an oscillation circuit driven by the output of the intermittent operation control circuit; and a switch circuit that is opened and closed by the oscillation output of the oscillation circuit. The switch circuit is inserted in the passage.

【0006】[0006]

【作用】スイッチ回路から誤差増幅器および駆動回路に
電流が供給され低電流が検出されると、間欠動作制御回
路が発振回路を動作させ、発振回路は一定の周期とデュ
ーティのパルスを出力し、スイッチ回路を開閉させる。
When a current is supplied from the switch circuit to the error amplifier and the drive circuit and a low current is detected, the intermittent operation control circuit operates the oscillation circuit, and the oscillation circuit outputs a pulse having a constant cycle and a duty. Open and close the circuit.

【0007】このように制御回路の動作を間欠的に停止
させることにより、軽負荷時における効率を向上させる
ことができる。
By intermittently stopping the operation of the control circuit as described above, the efficiency at the time of light load can be improved.

【0008】[0008]

【実施例】次に、本発明実施例を図面に基づいて説明す
る。図1は本発明実施例の構成を示すブロック図であ
る。
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

【0009】本発明実施例は、入力端子11と、出力端
子12と、この出力端子12の出力電圧と基準電圧(E
s )との誤差を検出する誤差増幅器3と、入力端子11
と出力端子12との間に直列接続された出力トランジス
タ2と、この誤差増幅器3の出力にしたがって駆動され
出力トランジスタ2の制御電極を制御する駆動回路4と
を備え、さらに、本発明の特徴として、出力端子11の
電流を検出する電流検出抵抗6と、この電流検出抵抗6
により検出された電流値が規定値より小さいときに出力
を送出する間欠動作制御回路9と、この間欠動作制御回
路9の出力により駆動される発振回路8と、この発振回
路8の発振出力により開閉されるスイッチ回路7とを設
け、誤差増幅器3の電源電流通路にこのスイッチ回路7
が挿入される。
In the embodiment of the present invention, an input terminal 11, an output terminal 12, an output voltage of the output terminal 12 and a reference voltage (E
s ) and an error amplifier 3 for detecting an error with respect to the input terminal 11
An output transistor 2 connected in series between the output transistor 12 and the output terminal 12; and a drive circuit 4 that is driven according to the output of the error amplifier 3 and controls a control electrode of the output transistor 2. , A current detection resistor 6 for detecting the current of the output terminal 11,
, An intermittent operation control circuit 9 which sends out an output when the current value detected by the circuit is smaller than a specified value, an oscillation circuit 8 driven by the output of the intermittent operation control circuit 9, A switching circuit 7 is provided in the power supply current path of the error amplifier 3.
Is inserted.

【0010】次に、このように構成された本発明実施例
の動作について説明する。
Next, the operation of the embodiment of the present invention configured as described above will be described.

【0011】スイッチ回路7を介して誤差増幅器3、駆
動回路4に電源が供給され電流検出抵抗6により低電流
が検出されると、間欠動作制御回路9の出力が発振回路
8の動作を開始させる。発振回路8は一定の周期とデュ
ーティのパルスを出力し、スイッチ回路7を開閉させ
る。
When power is supplied to the error amplifier 3 and the drive circuit 4 via the switch circuit 7 and a low current is detected by the current detection resistor 6, the output of the intermittent operation control circuit 9 starts the operation of the oscillation circuit 8. . The oscillating circuit 8 outputs a pulse having a constant cycle and duty to open and close the switch circuit 7.

【0012】図2は図1に示すシリーズレギュレータの
入力電流と出力電流との関係を示す図である。出力電流
がI00以下になると間欠動作制御回路9が動作し、間欠
動作状態になり間欠動作のデューティの期間に入力電流
は減少する。
FIG. 2 is a diagram showing the relationship between the input current and the output current of the series regulator shown in FIG. Output current I 00 following happens when operating the intermittent operation control circuit 9, the input current to the period of the duty of the intermittent operation becomes intermittent operation state is reduced.

【0013】[0013]

【発明の効果】以上説明したように本発明によれば、シ
リーズレギュレータの制御回路の動作を間欠的に停止す
ることにより、軽負荷時の効率を向上させることができ
る効果がある。
As described above, according to the present invention, there is an effect that the efficiency at the time of light load can be improved by intermittently stopping the operation of the control circuit of the series regulator.

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

【図1】本発明実施例の構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

【図2】本発明実施例における入力電流と出力電流の関
係を示す図。
FIG. 2 is a diagram showing a relationship between an input current and an output current in the embodiment of the present invention.

【図3】従来例の構成を示すブロック図。FIG. 3 is a block diagram showing a configuration of a conventional example.

【符号の説明】[Explanation of symbols]

1 入力コンデンサ 2 出力トランジスタ 3 誤差増幅器 4 駆動回路 5 出力コンデンサ 6 電流検出抵抗 7 スイッチ回路 8 発振回路 9 間欠動作制御回路 11 入力端子 12 出力端子 Reference Signs List 1 input capacitor 2 output transistor 3 error amplifier 4 drive circuit 5 output capacitor 6 current detection resistor 7 switch circuit 8 oscillation circuit 9 intermittent operation control circuit 11 input terminal 12 output terminal

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 入力端子と、出力端子と、この出力端子
の出力電圧と基準電圧(Es )との誤差を検出する誤差
増幅器と、前記入力端子と出力端子との間に直列接続さ
れた出力トランジスタと、この誤差増幅器の出力にした
がって駆動され前記出力トランジスタの制御電極を制御
する駆動回路とを備えたシリーズレギュレータにおい
て、 前記出力端子の電流を検出する電流検出抵抗と、 この電流検出抵抗により検出された電流値が規定値より
小さいときに出力を送出する間欠動作制御回路と、 この間欠動作制御回路の出力により駆動される発振回路
と、 この発振回路の発振出力により開閉されるスイッチ回路
とを設け、 前記誤差増幅器の電源電流通路にこのスイッチ回路が挿
入されたことを特徴とするシリーズレギュレータ。
1. An input terminal, an output terminal, an error amplifier for detecting an error between an output voltage of the output terminal and a reference voltage (E s ), and a series connection between the input terminal and the output terminal. In a series regulator including an output transistor and a drive circuit driven according to the output of the error amplifier and controlling a control electrode of the output transistor, a current detection resistor for detecting a current of the output terminal; An intermittent operation control circuit that sends out an output when the detected current value is smaller than a specified value; an oscillation circuit driven by the output of the intermittent operation control circuit; and a switch circuit that is opened and closed by the oscillation output of the oscillation circuit. Wherein the switch circuit is inserted in a power supply current path of the error amplifier.
JP28333191A 1991-10-29 1991-10-29 Series regulator Expired - Fee Related JP3180383B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28333191A JP3180383B2 (en) 1991-10-29 1991-10-29 Series regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28333191A JP3180383B2 (en) 1991-10-29 1991-10-29 Series regulator

Publications (2)

Publication Number Publication Date
JPH05119855A JPH05119855A (en) 1993-05-18
JP3180383B2 true JP3180383B2 (en) 2001-06-25

Family

ID=17664094

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28333191A Expired - Fee Related JP3180383B2 (en) 1991-10-29 1991-10-29 Series regulator

Country Status (1)

Country Link
JP (1) JP3180383B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11305880A (en) * 1998-04-23 1999-11-05 Sony Corp Usb equipment and usb hub device
JP4592408B2 (en) * 2004-12-07 2010-12-01 株式会社リコー Power circuit
JP2006228076A (en) * 2005-02-21 2006-08-31 Seiko Instruments Inc Voltage regulator
JP2011065616A (en) 2009-08-21 2011-03-31 Sony Corp Electronic apparatus

Also Published As

Publication number Publication date
JPH05119855A (en) 1993-05-18

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