JPH01227626A - Short-circuit prevention circuit - Google Patents
Short-circuit prevention circuitInfo
- Publication number
- JPH01227626A JPH01227626A JP63049819A JP4981988A JPH01227626A JP H01227626 A JPH01227626 A JP H01227626A JP 63049819 A JP63049819 A JP 63049819A JP 4981988 A JP4981988 A JP 4981988A JP H01227626 A JPH01227626 A JP H01227626A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- instrument
- meter
- power
- 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.)
- Pending
Links
- 230000002265 prevention Effects 0.000 title claims abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野〉
本発明は、計器などに接続される電源ラインの短絡を防
止する短絡防止回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a short-circuit prevention circuit that prevents short-circuits in power lines connected to meters and the like.
〈従来の技術）
制御パネルなどに取付（プられて使用される各種の計器
は、通常、外部電源から供給される電ｍ電圧によって動
作する。<Prior Art> Various instruments used by being attached to a control panel or the like are normally operated by electric voltage supplied from an external power source.
第２図はこのような計器に電源電圧を供給する電源回路
の一例を示すブロック図である。FIG. 2 is a block diagram showing an example of a power supply circuit that supplies power supply voltage to such a meter.
この図に示す電源回路１００は、外部電源１０１の各電
源端子と計器１０５の各電源端子とを接続する２本のラ
イン１０７．１０８と、一方のライン１０７に介挿され
る電源スィッチ１０６とを備えており、この電源スィッ
チ１０６がオンされたとき、外部電源１０１から出力さ
れる電源電圧を取込んで、これを計器１０５に供給する
。The power supply circuit 100 shown in this figure includes two lines 107 and 108 that connect each power supply terminal of the external power supply 101 and each power supply terminal of the meter 105, and a power switch 106 inserted in one of the lines 107. When this power switch 106 is turned on, it takes in the power supply voltage output from the external power supply 101 and supplies it to the meter 105.
（発明が解決しようとする課題）
ところでこのような電源回路１００においては、計器１
０５のメンテナンスなどを行なうとき、通常電源スィッ
チ１０６をオフ状態にして、計器１０５の電源端子から
各ライン１０７．１０８の端子を外すようにしている。(Problem to be Solved by the Invention) By the way, in such a power supply circuit 100, the meter 1
05, the power switch 106 is normally turned off and the terminals of each line 107 and 108 are disconnected from the power terminal of the meter 105.
しかしながら、このような方法では、電源スィッチ１０
６の切り忘れに起因する短絡事故や感電事故の発生を完
全に防止することができない。However, in such a method, the power switch 10
It is not possible to completely prevent short-circuit accidents and electric shock accidents caused by forgetting to turn off the power switch 6.
また、−旦、電源スィッチ１０６を切って計器１０５の
電源端子から各ライン１０７．１０８の端子を外した場
合でも、他の人が誤って電源スィッチ１０６を投入する
ことがあるため、一端、電源スィッチ１０６を切っても
、ライン１０７．１−０ □
０８の接触による短絡事故や感電事故の発生を完全に防
止することができない。Furthermore, even if you turn off the power switch 106 and disconnect the terminals of each line 107 and 108 from the power terminal of the meter 105, someone else may turn on the power switch 106 by mistake. Even if the switch 106 is turned off, it is not possible to completely prevent a short circuit accident or an electric shock accident due to contact with the line 107.1-0 □ 08.
本発明は上〜記の事情に鑑み、電源スィッチの切り忘れ
などに起因する短絡事故や、感電事故の発生を簡単な構
成で防止できる短絡防止回路を提供することを目的とし
ている。In view of the above circumstances, it is an object of the present invention to provide a short circuit prevention circuit that can prevent short circuit accidents and electric shock accidents caused by forgetting to turn off the power switch with a simple configuration.
［発明の構成コ
（課題を解決するための手段）
上記の目的を達成するために本発明による短絡防止回路
は、計器の各電源端子に並列に接続される抵抗器と、こ
の抵抗器に所定値以上の電流が流れたとき前記計器の電
源ラインを遮断する遮断器とを備えたことを特徴として
いる。′（作用）
上記の構成において、計器の各電源端子から電源ライン
が外されたとき、抵抗器に所定値以上の電流が流れ、こ
れによって遮断器が動作し、前記計器の電源ラインを遮
断する。[Configuration of the Invention (Means for Solving the Problem) In order to achieve the above object, the short circuit prevention circuit according to the present invention includes a resistor connected in parallel to each power terminal of a meter, and a predetermined resistor connected to the resistor. The meter is characterized by comprising a circuit breaker that cuts off the power supply line of the meter when a current exceeding a value flows. (Function) In the above configuration, when the power line is disconnected from each power terminal of the meter, a current of a predetermined value or more flows through the resistor, which activates the circuit breaker and cuts off the power line of the meter. .
（実施例）
第１図は本発明による短絡防止回路の一実施例の構成を
示すブロック図である。(Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of a short circuit prevention circuit according to the present invention.
この図に示す短絡防止回路１は、オーブン検出部２と、
遮断部３とを備えており、電源スィッチ４を有する電源
回路５の出力側がオーブン状態にされたとき、これを検
出しライン１０を遮断し、外部型８！１２によって得ら
れた電源電圧が計器６に供給されないようにする。The short circuit prevention circuit 1 shown in this figure includes an oven detection section 2,
When the output side of the power supply circuit 5 having the power switch 4 is placed in the oven state, this is detected and the line 10 is cut off, and the power supply voltage obtained by the external type 8!12 is transmitted to the meter. 6.
オーブン検出部２は、抵抗器７と、リレー８と、常閉ス
イッチ９とが直列に接続された回路であり、計器６の各
電源端子からライン１０、またはうイン１１の端子が外
されたとき、これを検知して遮断部３を動作させる。
−
遮断部３は、ライン１０に介挿される常閉接点８ｂを備
えており、前記すし−８が動作したとき、常閉接点８ｂ
が開状態になって前記電源回路５から出力さる電源電圧
が計器６に供給されないようにする。The oven detection unit 2 is a circuit in which a resistor 7, a relay 8, and a normally closed switch 9 are connected in series, and the line 10 or the in-line 11 terminal is disconnected from each power terminal of the meter 6. When this is detected, the cutoff section 3 is operated.
- The cut-off part 3 is equipped with a normally closed contact 8b inserted into the line 10, and when the sushi-8 is operated, the normally closed contact 8b is inserted into the line 10.
is in an open state so that the power supply voltage output from the power supply circuit 5 is not supplied to the meter 6.
前記抵抗器７の抵抗値は、計器６の内部抵抗よりも大き
く、かつ、計器６への電源電圧供給時（通常動作時）に
あってはリレー８が作動してその常閉接点８ｂが開かな
いような値に設定される。The resistance value of the resistor 7 is larger than the internal resistance of the meter 6, and when the power supply voltage is supplied to the meter 6 (during normal operation), the relay 8 is activated and its normally closed contact 8b is opened. is set to a value such that it does not exist.
従って、通常動作時においては、電源スィッチ４がオン
されると外部電源１２から計器６に電圧が供給される。Therefore, during normal operation, when the power switch 4 is turned on, voltage is supplied from the external power supply 12 to the meter 6.
そして、計器６のメンテナンスなどにより、電源ライン
１０または１１の各端子を計器６から外すと、外部電源
１２の電圧は全て短絡防止回路１へ供給される。When each terminal of the power line 10 or 11 is removed from the meter 6 due to maintenance of the meter 6 or the like, all the voltage of the external power source 12 is supplied to the short circuit prevention circuit 1.
これにより、リレー８が作動し、その常閉接点８ｂが直
ちに開き、計器６への電源電圧供給が遮断されるのであ
る。As a result, the relay 8 is activated, its normally closed contact 8b immediately opens, and the power supply voltage to the meter 6 is cut off.
一方、計器６のメンテナンスなどが終了し、電源ライン
１０または１１の各端子が計器６に接続後は、常閉スイ
ッチ９を開くと、リレー８の接点８ｂが閉じ、計器６に
電源電圧が供給される。：このように、この実施例にお
いては、計゛器６の各電源端子からライン１０の端子や
、ライン１１の端子が外されたとき、これを検知して常
閉接点８ｂが開状態となり、計器６への電源電圧の供給
が遮断されるので、電源スィッチ４を切り忘れても感電
事故や短絡事故の発生が防止できる。On the other hand, after the maintenance of the meter 6 is completed and each terminal of the power line 10 or 11 is connected to the meter 6, when the normally closed switch 9 is opened, the contact 8b of the relay 8 is closed and the power voltage is supplied to the meter 6. be done. In this way, in this embodiment, when the line 10 terminal or the line 11 terminal is disconnected from each power terminal of the meter 6, this is detected and the normally closed contact 8b is opened. Since the supply of power supply voltage to the meter 6 is cut off, even if you forget to turn off the power switch 4, it is possible to prevent an electric shock accident or a short circuit accident from occurring.
［発明の効果コ
以上説明したＪ：うに本発明によれば、電源スイッチの
切り忘れなどに起因する短絡事故や感電事故の発生を簡
単な構成でもって未然に防止することができる。[Effects of the Invention] According to the present invention, short circuit accidents and electric shock accidents caused by forgetting to turn off the power switch can be prevented with a simple configuration.
第１図は本発明による短絡防止回路の一実施例を示すブ
ロック図、第２図は一般的な電源回路の一例を示すブロ
ック図である。
３・・・遮断器（″ａ断部）
６・・・計器 ７・・・抵抗器
１０・・・電源ライン（ライン）
゛ 代理人弁理士三好保男−〇 −FIG. 1 is a block diagram showing an embodiment of a short circuit prevention circuit according to the present invention, and FIG. 2 is a block diagram showing an example of a general power supply circuit. 3... Circuit breaker (a section) 6... Meter 7... Resistor 10... Power line (line) ゛ Representative Patent Attorney Yasuo Miyoshi -〇 -
Claims (1)
抗器に所定値以上の電流が流れたとき前記計器の電源ラ
インを遮断する遮断器とを備えたことを特徴とする短絡
防止回路A short-circuit prevention circuit comprising: a resistor connected in parallel to each power supply terminal of a meter; and a breaker that cuts off the power supply line of the meter when a current of a predetermined value or more flows through the resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63049819A JPH01227626A (en) | 1988-03-04 | 1988-03-04 | Short-circuit prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63049819A JPH01227626A (en) | 1988-03-04 | 1988-03-04 | Short-circuit prevention circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01227626A true JPH01227626A (en) | 1989-09-11 |
Family
ID=12841718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63049819A Pending JPH01227626A (en) | 1988-03-04 | 1988-03-04 | Short-circuit prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01227626A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100408875B1 (en) * | 2001-06-04 | 2003-12-11 | 김재영 | AC power supply for the protection of short circuit in the sequence-control development system |
| KR100704597B1 (en) * | 2003-02-19 | 2007-04-09 | 후지쯔 가부시끼가이샤 | Packet scheduling |
-
1988
- 1988-03-04 JP JP63049819A patent/JPH01227626A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100408875B1 (en) * | 2001-06-04 | 2003-12-11 | 김재영 | AC power supply for the protection of short circuit in the sequence-control development system |
| KR100704597B1 (en) * | 2003-02-19 | 2007-04-09 | 후지쯔 가부시끼가이샤 | Packet scheduling |
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