JPH0417513A - Overcurrent protective circuit - Google Patents
Overcurrent protective circuitInfo
- Publication number
- JPH0417513A JPH0417513A JP2122139A JP12213990A JPH0417513A JP H0417513 A JPH0417513 A JP H0417513A JP 2122139 A JP2122139 A JP 2122139A JP 12213990 A JP12213990 A JP 12213990A JP H0417513 A JPH0417513 A JP H0417513A
- Authority
- JP
- Japan
- Prior art keywords
- fuse
- power supply
- relay winding
- blow
- predetermined time
- 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
- 230000001681 protective effect Effects 0.000 title 1
- 238000001514 detection method Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 abstract description 9
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はヒユーズを用いた過電流保護回路に関し、特に
直流電源を入力とする直流電源回路に使用する過電流保
護回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overcurrent protection circuit using a fuse, and more particularly to an overcurrent protection circuit used in a DC power supply circuit that receives a DC power supply as an input.
従来、ヒユーズを用いた過電流保護回路は、電源回路の
入力又は出力に挿入され、ヒユーズの定格電流を越える
過電流が流れたときにヒユーズが切れることにより、自
己の電源回路及び電源供給先の回路を保護している。Conventionally, overcurrent protection circuits using fuses are inserted into the input or output of a power supply circuit, and when an overcurrent exceeding the rated current of the fuse flows, the fuse blows, thereby protecting the own power supply circuit and the power supply destination. Protecting the circuit.
上述した従来の過電流保護回路では、直流電源電圧が急
激に低下した場合における過電流や、信号の伝送線路等
に電源を供給している場合における雷により線路が一時
的に地落することによる過電流など、−時的な過電流で
もヒユーズが切れることになる。これら場合の過電流は
外部要因によるものであり、機器の故障によるものでは
ないのでヒユーズを交換さえすれば障害が復旧するが、
ヒユーズ交換は人手にたよっているために、ヒユーズ断
の発生箇所が遠隔地の場合には、故障の復旧に時間がか
かるという欠点がある。The above-mentioned conventional overcurrent protection circuits are susceptible to overcurrent when the DC power supply voltage suddenly drops, or when power is supplied to a signal transmission line, etc., due to the line temporarily falling to the ground due to lightning. Temporary overcurrent, such as overcurrent, can also cause the fuse to blow. In these cases, the overcurrent is caused by an external factor and not a failure of the equipment, so simply replacing the fuse will correct the problem.
Since fuse replacement relies on manual labor, there is a drawback that it takes time to recover from a failure if the fuse rupture occurs in a remote location.
本発明の目的は、入力電源電圧の急変等外部要因による
過電流でヒユーズが切れた場合、短時間でヒユーズ断障
害を復旧することができる過電流保護回路を提供するこ
とにある。An object of the present invention is to provide an overcurrent protection circuit that can recover from a blown fuse fault in a short time when a fuse is blown due to an overcurrent caused by an external factor such as a sudden change in input power supply voltage.
本発明の過電流保護回路は、直流電源回路に接続される
第１のヒユーズが切れたことを検出する検出手段と、前
記検出手段の動作から所定の時限後に動作する時限手段
と、前記時限手段の動作により前記第１のヒユーズと並
列に接続される第２のヒユーズとを備える構成である。The overcurrent protection circuit of the present invention includes a detection means for detecting that a first fuse connected to a DC power supply circuit is blown, a time limit means that operates after a predetermined time period from the operation of the detection means, and the time limit means. This configuration includes a second fuse that is connected in parallel to the first fuse by the operation of.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示す回路図であり、本実施
例では、過電流保護回路が直流電源回路１０の入力側に
挿入された場合が示されている。第１図において、直流
電源回路１０に付加される過電流保護回路は、通常使用
されるメインヒユーズ３が切れたことを検出する警報接
点４と、抵抗器５．コンデンサ６及びリレー巻線７で構
成されこの警報接点４の動作がら所定の時限後に動作す
る時限回路と、リレー巻線７のメーク接点８によってメ
インヒユーズ３と並列に接続される予備ヒユーズ９とを
備える。FIG. 1 is a circuit diagram showing an embodiment of the present invention. In this embodiment, an overcurrent protection circuit is inserted on the input side of a DC power supply circuit 10. As shown in FIG. In FIG. 1, the overcurrent protection circuit added to the DC power supply circuit 10 includes an alarm contact 4 that detects when the normally used main fuse 3 is blown, and a resistor 5. A time limit circuit is constructed of a capacitor 6 and a relay winding 7 and operates after a predetermined time period when the alarm contact 4 operates, and a standby fuse 9 is connected in parallel to the main fuse 3 by a make contact 8 of the relay winding 7. Be prepared.
以下に、動作を説明する。電源入力端子１及び２間に供
給する直流電圧が急激に低下した場合には、入力電流が
過大となり、まずメインヒユーズ３が切れる。メインヒ
ユーズ３が切れるとリレー巻線７の両端には、警報接点
４を介し抵抗器５及びコンデンサ６の時定数に従い電圧
が印加され、リレー巻線７の感動電圧に達した一定時間
後にリレー巻線７のメーク接点８が閉じる。従って、今
度は予備ヒユーズ９を通して再び直流電源回路１０に電
源を供給することができる。ここで、リレーの動作を抵
抗器５とコンデンサ６とにより一定時間遅延させて、も
う一つの予備ヒユーズ９に直ちに接続させないようにし
ているのは、入力電源電圧の急激な低下の様な外部の異
常現象が正常に戻るまでのタイミングを確保するためで
ある。The operation will be explained below. When the DC voltage supplied between the power supply input terminals 1 and 2 suddenly drops, the input current becomes excessive and the main fuse 3 is blown first. When the main fuse 3 is blown, a voltage is applied to both ends of the relay winding 7 via the alarm contact 4 according to the time constant of the resistor 5 and capacitor 6, and after a certain period of time when the voltage applied to the relay winding 7 is reached, the relay winding is turned off. Make contact 8 of line 7 is closed. Therefore, power can now be supplied to the DC power supply circuit 10 again through the backup fuse 9. Here, the reason why the operation of the relay is delayed for a certain period of time by the resistor 5 and the capacitor 6 so that it is not immediately connected to the other spare fuse 9 is because of external factors such as a sudden drop in the input power supply voltage. This is to ensure the timing until the abnormal phenomenon returns to normal.
本発明は以上説明したように、通常使用されているヒユ
ーズが切れたら一定時Ｍ ｔ＆にもう一つの予備のヒユ
ーズを切れたヒユーズと並列に接続することにより、入
力電源電圧の急変等外部要因による過電流でヒユーズが
切れた場合、短時間でヒユーズ断障害を復旧することか
できるという効果を有する。As explained above, in the present invention, when a normally used fuse is blown, by connecting another spare fuse in parallel with the blown fuse at a certain time, M t When a fuse blows due to overcurrent, it has the effect of being able to recover from the fuse blowout fault in a short time.
第１図は本発明の一実施例を示す回路向である。
１．２・・・・・・電源入力端子、３・・・・・・メイ
ンヒユーズ、４・・・・・・警報接点、５・・・・・・
抵抗器、６・・・・・・コンデンサ、７・・・・・・リ
レー巻線、８・・・・・・メーク接点、９・・・・・・
予備ヒユーズ、１０・・−・・・直流電源回路。FIG. 1 is a circuit diagram showing one embodiment of the present invention. 1.2...Power input terminal, 3...Main fuse, 4...Alarm contact, 5...
Resistor, 6... Capacitor, 7... Relay winding, 8... Make contact, 9...
Spare fuse, 10...DC power supply circuit.
Claims (1)
とを検出する検出手段と、前記検出手段の動作から所定
の時限後に動作する時限手段と、前記時限手段の動作に
より前記第１のヒューズと並列に接続される第２のヒュ
ーズとを備えたことを特徴とする過電流保護回路。a detection means for detecting that a first fuse connected to a DC power supply circuit is blown; a time limit means for operating after a predetermined time period from the operation of the detection means; An overcurrent protection circuit comprising: a second fuse connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2122139A JPH0417513A (en) | 1990-05-11 | 1990-05-11 | Overcurrent protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2122139A JPH0417513A (en) | 1990-05-11 | 1990-05-11 | Overcurrent protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0417513A true JPH0417513A (en) | 1992-01-22 |
Family
ID=14828579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2122139A Pending JPH0417513A (en) | 1990-05-11 | 1990-05-11 | Overcurrent protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0417513A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001238350A (en) * | 2000-02-28 | 2001-08-31 | Nec Corp | Method and circuit for overcurrent protection |
| US7573690B2 (en) * | 2005-04-13 | 2009-08-11 | Samsung Electronics Co., Ltd. | Backup fuse device, electronic apparatus including the backup fuse device, and method of operating the backup fuse device |
| JP2009266587A (en) * | 2008-04-24 | 2009-11-12 | Chugoku Electric Power Co Inc:The | Fuse device |
| US8517846B2 (en) | 2009-09-08 | 2013-08-27 | Jtekt Corporation | Sliding type tripod constant velocity joint |
-
1990
- 1990-05-11 JP JP2122139A patent/JPH0417513A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001238350A (en) * | 2000-02-28 | 2001-08-31 | Nec Corp | Method and circuit for overcurrent protection |
| US7573690B2 (en) * | 2005-04-13 | 2009-08-11 | Samsung Electronics Co., Ltd. | Backup fuse device, electronic apparatus including the backup fuse device, and method of operating the backup fuse device |
| JP2009266587A (en) * | 2008-04-24 | 2009-11-12 | Chugoku Electric Power Co Inc:The | Fuse device |
| US8517846B2 (en) | 2009-09-08 | 2013-08-27 | Jtekt Corporation | Sliding type tripod constant velocity joint |
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