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JPH01303012A - Protective circuit - Google Patents

Protective circuit

Info

Publication number
JPH01303012A
JPH01303012A JP63130661A JP13066188A JPH01303012A JP H01303012 A JPH01303012 A JP H01303012A JP 63130661 A JP63130661 A JP 63130661A JP 13066188 A JP13066188 A JP 13066188A JP H01303012 A JPH01303012 A JP H01303012A
Authority
JP
Japan
Prior art keywords
current source
input
terminal
transistor
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.)
Granted
Application number
JP63130661A
Other languages
Japanese (ja)
Other versions
JP2625892B2 (en
Inventor
Mitsuo Okawa
光雄 大川
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP63130661A priority Critical patent/JP2625892B2/en
Publication of JPH01303012A publication Critical patent/JPH01303012A/en
Application granted granted Critical
Publication of JP2625892B2 publication Critical patent/JP2625892B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Emergency Protection Circuit Devices (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To reset a protective circuit automatically, by connecting one input of a comparator with a voltage source where a diode is connected with a constant current source and connecting the other input of the comparator with a time constant circuit comprising a resistor and a capacitor. CONSTITUTION:One input of a differential comparator 102 is connected through a first current source 101 with a source voltage applying terminal 1 and grounded through a first diode 8 and a second diode 9. The other input thereof is connected through a second current source 100 with the source voltage applying terminal 1 and connected with the terminal 13 of a time constant circuit which is connected with a capacitor 15 and a resistor 14. An output voltage is produced based on the difference of potential between a bias source comprising the first current source 101 and the diodes 8, 9 and a time constant circuit comprising the second current source 100, the capacitor 15 and the resistor 14, then a reset input voltage is applied onto a flipflop 103 and outputted through a buffer circuit 104 to a terminal 42.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は電源電圧の投入印加時の保護回路に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a protection circuit when a power supply voltage is applied.

従来の技術 従来の保護回路は、手動でリセット機能をはたらかせる
構成であった。
2. Description of the Related Art Conventional protection circuits have a configuration in which a reset function is activated manually.

発明が解決しようとする課題 従来の構成によると、リセット機能を手動で実効しなけ
ればならず、操作上、不便である。
Problems to be Solved by the Invention According to the conventional configuration, the reset function must be executed manually, which is inconvenient in terms of operation.

本発明は、電源投入という基本動作により、自動的にリ
セットが実行される保護回路を提供するものである。
The present invention provides a protection circuit that is automatically reset by the basic operation of turning on the power.

課題を解決するための手段 本発明は、比較器、フリップフロップおよびバッファ回
路を順次段結合して備え、前記比較器の一方の入力を定
電流源にダイオードを接続した電圧源に接続し、他方の
入力を抵抗およびコンデンサの時定数回路に接続した構
成の保護回路である。
Means for Solving the Problems The present invention comprises a comparator, a flip-flop, and a buffer circuit coupled in sequence, one input of the comparator is connected to a voltage source having a diode connected to a constant current source, and the other input is connected to a voltage source having a diode connected to a constant current source. This is a protection circuit in which the input is connected to a time constant circuit of a resistor and a capacitor.

作用 本発明によると、充電時定数回路の電位変化を利用して
、比較器をはたらかせ、自動的に保護回路をリセットす
ることができる。
According to the present invention, the comparator can be activated by utilizing the potential change of the charging time constant circuit, and the protection circuit can be automatically reset.

実施例 以下、本発明の一実施例について図面とともに説明する
。第1図は本発明の保護回路の構成を示すブロック図で
あり、差動形比較器102の一方の入力は電源電圧印加
端子1に第1の電流源101を介して接続されるととも
に、第1のダイオート8、第2のダイオード9を介して
接地され、他方の入力は、前記電源電圧印加端子1に第
2の電流源100を介して接続されるとともに、容量1
5、抵抗14とが接続された時定数回路の端子13に接
続される。
EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the protection circuit of the present invention, in which one input of the differential comparator 102 is connected to the power supply voltage application terminal 1 via the first current source 101, and The other input is connected to the power supply voltage application terminal 1 via a second current source 100 and has a capacitance of 1.
5. It is connected to the terminal 13 of the time constant circuit, which is connected to the resistor 14.

電源電圧印加により第1の電流源101、ダイオード8
,9で構成されるバイアス源と、第2の電流源100.
容量15.抵抗14て構成する時定数回路バイアス源の
時定数電位との差により、出力電圧が発生し、フリップ
フロップ103にリセット入力電圧を与え、バッファ回
路1.04−を介し、端子42に出力される。
The first current source 101 and the diode 8 are
, 9, and a second current source 100.
Capacity 15. An output voltage is generated due to the difference between the voltage and the time constant potential of the time constant circuit bias source constituted by the resistor 14, which applies a reset input voltage to the flip-flop 103 and is output to the terminal 42 via the buffer circuit 1.04-. .

以」二、ブロック図を用いて本発明の保護回路の構成と
基本動作を説明したが、その具体的な回路構成は第2図
て示ずようなものである。すなわち、第2の電流源10
0は抵抗2.トランジスタ3および抵抗4の電流源にミ
ラー結合された抵抗10とトランジスタ11とて構成さ
れ、第1の電流源101は、同様に、電流ミラー結合の
抵抗5とトランジスタ6とて構成されている。差動形1
ヒ較器102はI・ランシスタ18,21,22゜23
.24..27て構成され、トランジスタ18のベース
は、基準バイアス電圧を与えるもので、ダイオード7の
カソードおよびダイオ−1’ 8のアノードに接続され
、ダイオード8のカソードはダイオード9のアノードと
接続し、ダイオード9のカソードは接地され、ダイオー
ド7のアノードは定電流源であるトランジスタ6のコレ
クタに接続するとともに、トランジスタ12のベースに
接続する。l・ランジスタ12のコレクタは接地し、エ
ミッタは端子13に接続する。トランジスタ12の役目
は端子13の電位」−昇を制限するためである。抵抗1
4は、電源オフ時、端子13の容量15に充電された電
荷を速やかに放電する目的て挿入している。抵抗4は定
電流値を決める制限抵抗である。抵抗16,19.25
およびl・ランシスタ1.7,20.26は差動形比較
器の定電流源を構成している。フリップフロップ103
はトランジスタ28,30,31.34−.36.44
で構成され、I・ランシスタ28は差動形比較器の出力
により、フリップフロップにリセット信号を与える素子
であり、トランジスタ30.36はエミッタ抵抗29.
30により定電流源を構成し、トランジスタ31,34
のコレクタ負荷を形成している。トランジスタ44はフ
リップフロップにセット信号を与えるスイッチ素子で、
そのコレクタはトランジスタ34のコレクタに接続し、
また、そのエミッタは接地し、ベースは入力端子43て
あり、この入力端子43に信号を印加することにより、
フリップフロップをセラI・状態にする。
The configuration and basic operation of the protection circuit of the present invention have been explained below using block diagrams, but the specific circuit configuration is as shown in FIG. That is, the second current source 10
0 is resistance 2. The first current source 101 is composed of a resistor 10 and a transistor 11 which are mirror-coupled to a current source of a transistor 3 and a resistor 4, and the first current source 101 is similarly composed of a resistor 5 and a transistor 6 which are current-mirror coupled. Differential type 1
The comparator 102 is an I-Lancistor 18, 21, 22°23
.. 24. .. The base of the transistor 18 provides a reference bias voltage and is connected to the cathode of the diode 7 and the anode of the diode 1'8, the cathode of the diode 8 is connected to the anode of the diode 9, The cathode of diode 7 is grounded, and the anode of diode 7 is connected to the collector of transistor 6, which is a constant current source, and to the base of transistor 12. The collector of the L transistor 12 is grounded, and the emitter is connected to the terminal 13. The role of the transistor 12 is to limit the rise in the potential of the terminal 13. resistance 1
4 is inserted for the purpose of quickly discharging the charge stored in the capacitor 15 of the terminal 13 when the power is turned off. The resistor 4 is a limiting resistor that determines the constant current value. Resistance 16, 19.25
and l-runsistors 1.7 and 20.26 constitute a constant current source of the differential comparator. flip flop 103
are transistors 28, 30, 31, 34-. 36.44
The I-run transistor 28 is an element that provides a reset signal to the flip-flop according to the output of the differential comparator, and the transistors 30 and 36 have emitter resistors 29 and 36, respectively.
30 constitutes a constant current source, and transistors 31 and 34
form the collector load. The transistor 44 is a switch element that provides a set signal to the flip-flop.
its collector is connected to the collector of transistor 34;
Also, its emitter is grounded, and its base is an input terminal 43, and by applying a signal to this input terminal 43,
Put the flip-flop into Serra I state.

第3図〜第8図は第2図における動作の概略を説明する
概略電位図である。第3図は差動比較器102の入力電
圧波形を時間軸を横に、縦軸に電圧を取ったものであり
、第4図はトランジスタ24の出力波形であり、第5図
はI・ランジスタ28のコレクタ波形てあり、第6図は
トランジスタ34のコレクタ波形てあり、第7図はトラ
ンジスタ39のコレクタ波形てあり、第8図はトランジ
スタ41のコレクタ波形、すなわち、出力端子42であ
る。
3 to 8 are schematic potential diagrams illustrating the outline of the operation in FIG. 2. Fig. 3 shows the input voltage waveform of the differential comparator 102 with the time axis horizontal and the voltage plotted on the vertical axis, Fig. 4 shows the output waveform of the transistor 24, and Fig. 5 shows the I transistor. 6 shows the collector waveform of the transistor 34, FIG. 7 shows the collector waveform of the transistor 39, and FIG. 8 shows the collector waveform of the transistor 41, that is, the output terminal 42.

以」二説明してきたところから明らかなように、本発明
の保護回路は電源電圧の投入印加と同時にリセット信号
を発生し、初期設定が自動的に達成でき、従来必要とし
たリセット用の専用端子等を特別に設けることが不要で
ある。また、端子13の大容量コンデンサーを除いて、
全て半導体集積回路(IC)化が容易である。
As is clear from the following explanation, the protection circuit of the present invention generates a reset signal at the same time as the power supply voltage is applied, and can automatically achieve initial settings, and does not require a dedicated terminal for reset, which was previously required. It is not necessary to specially provide such. Also, except for the large capacity capacitor at terminal 13,
All can be easily integrated into semiconductor integrated circuits (ICs).

発明の効果 本発明によれば、手動操作は何ら必要なく、電源電圧の
印加により自動的に保護回路のセットあるいはリセット
を実施することが可能となる。
Effects of the Invention According to the present invention, it is possible to automatically set or reset the protection circuit by applying a power supply voltage without any manual operation.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明保護回路の構成を示すブロック図、第2
図は本発明の具体的な構成を示す回路図、第3図〜第8
図は本発明保護回路の各部動作電位図である。 1・・・・・・電源電圧印加端子、1.00,101・
・・・・・定電流源、102・・・・・・差動形比較器
、103・・・・・・フリップフロップ、104・・・
・・・バッファ回路、42・・・・・・出力端子、]3
・・・・・・外部端子、14・・・・・・固定抵抗、1
5・・・・・・コンデンサー、8,9・・・・・・ダイ
オード、2,5,10,16,19,25,29゜35
.37・・・・・・エミッタ抵抗、3,6,11゜1?
、20,26,30,36.38・・・・・・電流源用
トランジスタ、4・・・・・・固定抵抗器、7・・・・
・・ダイオード、12・・・・・・クリップ用トランジ
スタ、18゜21.22,23,24.27・・・・−
・比較器用トランジスタ、28・・・・・・リセット用
トランジスタ、3]、、32・・・・・・フリップフロ
ップ用トランジスタ、44・・・・・・セット用トラン
ジスタ、39.41・・・・・・バッファトランジスタ
、32.33・・・・・・固定抵抗器、40・・・・・
・負荷抵抗。 代理人の氏名 弁理士 中尾敏男 はか1名−7=
FIG. 1 is a block diagram showing the configuration of the protection circuit of the present invention, and FIG.
The figures are circuit diagrams showing the specific configuration of the present invention, Figures 3 to 8.
The figure is an operational potential diagram of each part of the protection circuit of the present invention. 1...Power supply voltage application terminal, 1.00, 101.
... Constant current source, 102 ... Differential type comparator, 103 ... Flip-flop, 104 ...
... Buffer circuit, 42 ... Output terminal, ]3
......External terminal, 14...Fixed resistance, 1
5...Capacitor, 8,9...Diode, 2,5,10,16,19,25,29゜35
.. 37... Emitter resistance, 3, 6, 11°1?
, 20, 26, 30, 36.38... Current source transistor, 4... Fixed resistor, 7...
...Diode, 12...Clip transistor, 18゜21.22,23,24.27...-
・Comparator transistor, 28...Reset transistor, 3], 32...Flip-flop transistor, 44...Set transistor, 39.41... ...Buffer transistor, 32.33...Fixed resistor, 40...
·Load resistance. Name of agent: Patent attorney Toshio Nakao Haka1-7=

Claims (1)

【特許請求の範囲】[Claims] 比較器と、フリップフロップと、バッファ回路とを順次
段結合して備え、前記比較器の一方の入力を、第1の電
流源と第1、第2のダイオードとを継続接続した電圧源
に接続し、他方の入力を、第2の電流源とコンデンサー
および抵抗の並列接続体との中点に接続した構成の保護
回路。
A comparator, a flip-flop, and a buffer circuit are sequentially connected in stages, and one input of the comparator is connected to a voltage source in which a first current source and first and second diodes are continuously connected. and the other input is connected to the midpoint between the second current source and a parallel connection of a capacitor and a resistor.
JP63130661A 1988-05-27 1988-05-27 Malfunction prevention circuit at power-on Expired - Lifetime JP2625892B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63130661A JP2625892B2 (en) 1988-05-27 1988-05-27 Malfunction prevention circuit at power-on

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63130661A JP2625892B2 (en) 1988-05-27 1988-05-27 Malfunction prevention circuit at power-on

Publications (2)

Publication Number Publication Date
JPH01303012A true JPH01303012A (en) 1989-12-06
JP2625892B2 JP2625892B2 (en) 1997-07-02

Family

ID=15039585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63130661A Expired - Lifetime JP2625892B2 (en) 1988-05-27 1988-05-27 Malfunction prevention circuit at power-on

Country Status (1)

Country Link
JP (1) JP2625892B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5534782A (en) * 1993-11-17 1996-07-09 Controlled Power Limited Partnership Automatic reclosing circuit breaker using controllable feeder transducer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62202021U (en) * 1986-06-12 1987-12-23

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62202021U (en) * 1986-06-12 1987-12-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5534782A (en) * 1993-11-17 1996-07-09 Controlled Power Limited Partnership Automatic reclosing circuit breaker using controllable feeder transducer

Also Published As

Publication number Publication date
JP2625892B2 (en) 1997-07-02

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