JPS6068415A - Protecting circuit of ac switch - Google Patents
Protecting circuit of ac switchInfo
- Publication number
- JPS6068415A JPS6068415A JP7552084A JP7552084A JPS6068415A JP S6068415 A JPS6068415 A JP S6068415A JP 7552084 A JP7552084 A JP 7552084A JP 7552084 A JP7552084 A JP 7552084A JP S6068415 A JPS6068415 A JP S6068415A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- switching means
- trigger
- voltage
- scr33
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
Landscapes
- Control Of Voltage And Current In General (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、スイッチング手段を用いた交流開閉回路の
保護回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection circuit for an AC switching circuit using switching means.
従来交流開閉回路の保護回路として負荷電流へ流れる電
流が、負荷の短絡事故等によって過電流状態となったと
き、主開閉素子をカットオフ状態にして短絡事故等によ
って発生する開閉器や負荷の発熱を防いでいる。Conventionally, as a protection circuit for AC switching circuits, when the current flowing to the load current becomes overcurrent due to a load short circuit, etc., the main switching element is cut off to prevent heat generation in the switch and load caused by the short circuit. is prevented.
しかしながら従来の回路は1開IRJ素子がカットオフ
状態になったとき、その状態を保持する回路であるため
に、一度負荷への通電を切って再度投入しな【プれば通
電は復旧しない短絡状態保持回路である。However, in conventional circuits, when the single-open IRJ element enters the cut-off state, it is a circuit that maintains that state. It is a state holding circuit.
ごの従来の保護回路は負荷が瞬1+1知絽状態になって
、すぐに復旧したときも電源の入力を行なわなければな
らずわずられしいものである。The conventional protection circuit is troublesome because even when the load momentarily goes into the 1+1 state, the power supply must be input even when the load is immediately restored.
そこでこの発明は上記従来技術の欠点に鑑みてなされた
もので、負荷等への過電流状態が検出されれば負荷電流
制御用のスイッチング手段を*断するとともに、負荷へ
の過電流状態が復旧したときは自動的に五記スイツヂン
グ手段をオンさゼて負荷への通電を行なわしめて負荷復
旧時の電源の大切をなくし点検作業者のメンデナンス作
業を行ないやりクシだ交流開閉回路の保護回路を提供す
ることを目的とする。Therefore, this invention was made in view of the above-mentioned drawbacks of the conventional technology.When an overcurrent condition to a load is detected, the switching means for controlling the load current is cut off, and the overcurrent condition to the load is restored. When this occurs, the switching means is automatically turned on to energize the load, eliminating the need for a power supply when restoring the load, eliminating maintenance work for inspection workers, and providing a protective circuit for AC switching circuits. The purpose is to
以下、本発明を交流開閉用2線式近接スイッチに適用し
た一実施例につき説明1−る、第1図にJ3いて交流電
源1に接続された負荷2が近接スイッチ3により開閉さ
れる。近接スイッチ3は、整流ブリッジ31、電流制限
用抵抗32゜負荷を開131]−するための主スイツチ
ング素子たる5CR33、この5CR33に逆バイアス
を加えるための定電圧ダイオード34.過電流を読取る
ための抵抗35,5CR33を接地するための5CR3
6、このS CII 36を保護するための保護抵抗3
7.保護コンデンサ38.近接スイッチ回路41及びト
リガ回路42から構成されている。また抵抗44は制限
抵抗、ダイオード39と抵抗40とは直列接続してあり
、5CR33がオンしたとぎ定電圧ダイオード34によ
る電圧が近接スイッチ41.トリガ回路42等に供給さ
れる構成としである。また定電圧回路43は近接スイッ
チ41,1〜リガ回路42の供給電圧を一定に保つため
の回路である。Hereinafter, an embodiment in which the present invention is applied to a two-wire proximity switch for AC switching will be described. In FIG. The proximity switch 3 includes a rectifier bridge 31, a current limiting resistor 32, a main switching element 5CR33 for opening the load, and a constant voltage diode 34 for applying a reverse bias to the 5CR33. Resistor 35 for reading overcurrent, 5CR3 for grounding 5CR33
6. Protection resistor 3 to protect this SCII 36
7. Protective capacitor 38. It is composed of a proximity switch circuit 41 and a trigger circuit 42. Further, the resistor 44 is a limiting resistor, and the diode 39 and the resistor 40 are connected in series, and when 5CR33 is turned on, the voltage from the constant voltage diode 34 is applied to the proximity switch 41. The configuration is such that the signal is supplied to the trigger circuit 42 and the like. Further, the constant voltage circuit 43 is a circuit for keeping the supply voltage of the proximity switch 41,1 to the trigger circuit 42 constant.
近接スイッチ回路41は例えば、検出コイルと発振回路
を有し、このコイルに金属等の被検出物体が近づくとき
コイルの定数が変ることを利用して、発振回路の発振を
停庄ざUたり開始させたりし、この発振回路用ノjに応
じて検出信号を形成するようにしているものである。ト
リガ回路42は近接スイッチ回路41からの検出信号を
交番プだとき、交流のU口点で1−リガパルスを生じて
これを5CR33のグー1〜に送るゼロクロストリガ回
路(この実施例で用いている)や、他のトリ力パルス発
生回路等を用いることができる。The proximity switch circuit 41 has, for example, a detection coil and an oscillation circuit, and uses the fact that the constant of the coil changes when an object to be detected such as metal approaches the coil to stop and start oscillation of the oscillation circuit. The detection signal is generated in accordance with this oscillation circuit nozzle. When the trigger circuit 42 receives the detection signal from the proximity switch circuit 41, it generates a 1-trigger pulse at the U point of the alternating current and sends it to the 5CR33's G1~ (zero cross trigger circuit (used in this embodiment)). ), other tri-force pulse generation circuits, etc. can be used.
次に動作につき第2図を姦照しながら説明Jる。被検出
物体が近づいて近接スイッチ回路41から検出信号が生
じると、1〜り刀回路42より交流ゼロ点でトリガ13
号が発生し、イのため5CR33がターンオンする。通
常負荷時には5CR33に流れる電流が小さいので抵抗
35の両端電圧は小さい。その結果5CR36がオンす
るのに充分なレベル(1〜リガレヘル)Lに達せず、5
CR33は全周期にわIこつCAンとなる。Next, the operation will be explained with reference to Figure 2. When the object to be detected approaches and a detection signal is generated from the proximity switch circuit 41, a trigger 13 is generated at the AC zero point from the 1 to 3 switch circuit 42.
A signal is generated, and 5CR33 is turned on because of the signal. During normal load, the current flowing through the 5CR33 is small, so the voltage across the resistor 35 is small. As a result, 5CR36 did not reach a sufficient level (1 to regale health) L to turn on, and 5
CR33 is in constant mode during the entire cycle.
このとき(SCR33かオン、5CR36かオフのとき
)、定電圧ダイオード34と5CR33との接続点には
、抵抗35の両端に生じる電圧に定電圧ダイオード34
のしきい電圧を加えた電圧が発生し、この電圧がダイオ
ード39と抵抗40を経て少し電圧降下されて、近接ス
イッチ回路41.トリガ回路42及び定電圧回路43に
加えられる。そして定電圧回路43によって定電圧化さ
れることによって、近接スイッチ回路41.トリガ回路
42に安定した電圧が与えられることになる。At this time (when SCR33 is on and 5CR36 is off), a voltage regulator diode 34 is connected to the voltage generated across the resistor 35 at the connection point between the voltage regulator diode 34 and 5CR33.
A voltage is generated which is the sum of the threshold voltage of . It is added to the trigger circuit 42 and constant voltage circuit 43. Then, the voltage is made constant by the constant voltage circuit 43, so that the proximity switch circuit 41. A stable voltage will be applied to the trigger circuit 42.
他方、被検出物体が存在せず、近接スイッチ回路41か
ら検出信号が出されず、トリガ回路42からトリガ信号
が発生しない場合は5CR33はオフで、5CF(36
もオフである。このときには整流ブリッジ31の整流側
出力端には交流電源1の電圧がほぼそのまま(単に整流
されただ番プで)現われるので、これを抵抗44で降下
して低電圧にし、近接スイッチ回路41゜トリガ回路4
2.定電圧回路43に与える。また抵抗44が電圧降下
することにより、近接スイッチ回路41等にこの抵抗4
4を通っC流れていく電流を制限し、負荷2に流れる電
流を少なくし、5CR33がAノのときに負荷2に大き
な電流が流れて負荷2がオンし−Cしようことを防止す
る。定電圧回路/13はこの整流出力のリップル分を除
去し、一定の安定した電圧を生じる。ダイオード39は
このときに、抵抗44を通った電流が定電圧ダイΔ−ド
34及び抵抗35を経て流れることを防止りる。On the other hand, when there is no object to be detected, no detection signal is output from the proximity switch circuit 41, and no trigger signal is generated from the trigger circuit 42, 5CR33 is off and 5CF (36
is also off. At this time, the voltage of the AC power source 1 appears almost as is (simply as a rectified voltage) at the rectifying side output terminal of the rectifying bridge 31, so this voltage is lowered by the resistor 44 to a low voltage, and the proximity switch circuit 41 is triggered. circuit 4
2. It is applied to the constant voltage circuit 43. Also, due to the voltage drop across the resistor 44, the proximity switch circuit 41, etc.
This restricts the current flowing through C through C to reduce the current flowing to load 2, and prevents a large current from flowing to load 2 when 5CR33 is A and turning on load 2 and causing -C. The constant voltage circuit/13 removes the ripple component of this rectified output and produces a constant and stable voltage. Diode 39 then prevents the current through resistor 44 from flowing through constant voltage diode Δ-de 34 and resistor 35.
負荷に異常が生じて、短絡や過負向となると、5CR3
3に過大電流が流れるJ、うになり、抵抗35の両端電
圧はS CR36をAンηるのに十分な電圧しに達づる
。5CR36がターンオンづると、5CR33のアノー
ドからカソードに流れる電流の一部がそのグー1へがら
取り出され、S CR36のアノードからカッ−1〜を
通って流れる。そのl〔めSC[よ33はグー1−に逆
電流が流されたことになりターンオンする。その結果5
CR36のアノード・カソード間の印加電圧が無くなる
ので5C836もターンオンする。このとき抵抗32は
、5CR33に流れるアノード電流を制限して5CR3
3のターンオフを促進ダ−る。5CR33Gよ、このよ
うにターンオフした後、次のトリガ信号がゲートに送ら
れるまではオンしない。また5CR36はターンオンし
た後コンデンサ38の電位がゲートトリガ電圧よりも下
るまでオンしつづけ、コンデンサ38の電位が所定の電
圧以下になるとターンオフする。次のトリガ信号が導出
されたとき短絡や過負荷状態が続いていれば前述の動作
がくり返される。しかし、次のトリガ信号が導出された
とぎ短絡や過負荷状態が解消されていれば、5CR36
はターンオンすることはない。If an abnormality occurs in the load, resulting in a short circuit or overload, 5CR3
When an excessive current flows through the resistor 3, the voltage across the resistor 35 reaches a voltage sufficient to cross the SCR 36. When the 5CR36 is turned on, a portion of the current flowing from the anode to the cathode of the 5CR33 is extracted into its Go1 and flows from the anode of the SCR36 through the K1. Since a reverse current is applied to the SC 1-, the SC 33 is turned on. Result 5
Since the voltage applied between the anode and cathode of CR36 disappears, 5C836 is also turned on. At this time, the resistor 32 limits the anode current flowing through the 5CR33.
Facilitate turn-off of 3. 5CR33G, after turning off like this, it will not turn on until the next trigger signal is sent to the gate. Further, after the 5CR 36 is turned on, it continues to be on until the potential of the capacitor 38 becomes lower than the gate trigger voltage, and turns off when the potential of the capacitor 38 becomes lower than a predetermined voltage. If the short circuit or overload condition continues when the next trigger signal is derived, the above-described operation is repeated. However, if the short circuit or overload condition is resolved by the time the next trigger signal is derived, the 5CR36
will never turn on.
な83以上の実施例は交流開閉用2線式近接スイッチを
示したが、光電スイッチや無接点マイクロスイッチ等、
他の無接点形の交流開閉を行なうスイッチに適用できる
ことはもちろんである。また間閑用スイツヂング素子と
しては5C1(に限られずGTO笠の他の素子を使用で
きる。The above 83 examples have shown two-wire proximity switches for AC switching, but photoelectric switches, non-contact microswitches, etc.
Of course, the present invention can also be applied to other non-contact type AC switching switches. Furthermore, the switching element for intermission is not limited to 5C1, but other elements of the GTO shade can be used.
さらに過電流読取用抵抗の両端電圧を適当なスイッチン
グ回路で検出り−るようにりれば、第2のスイッチング
手段〈実施例ではS Cl’< 、36 )のトリガ電
圧のぽらつぎにも対処できるなと、回路変更も可能であ
る。Furthermore, if the voltage across the overcurrent reading resistor is detected by an appropriate switching circuit, the trigger voltage of the second switching means (S Cl'< , 36 in the embodiment) can also be detected. It is possible to deal with this problem by changing the circuit.
この発明によれば、負荷への電流の過多を過電流を検知
づるl〔めの抵抗で検知し、この抵抗で発生ずる電圧が
所定値を超え)ことき、第2のスイッチング手段をオン
さIL−(負荷電流制御用の第1のスイッチング手段の
1−リガ端子を接地して第1のスイッチング手段をオフ
状態にし、次のゼロ点で発生するトリが信号導出時に過
電流状態が解除されていれば再度第1のスイッチング手
段をオンさけるようにし!こので、負4ii (!j旧
等の過電流状態が解除されたときに電源の1iIJ人を
行なう必要がなくなり点検作業者のメンテナンス作業を
極めて簡単に1−■なうことが(゛さる交流ntl閉回
路の保護回路を提供りることかできる。According to this invention, when excessive current to the load is detected by the first resistor of the overcurrent detection circuit, and the voltage generated by this resistor exceeds a predetermined value, the second switching means is turned on. IL- (The 1-trigger terminal of the first switching means for load current control is grounded to turn off the first switching means, and the overcurrent condition is canceled when the trigger generated at the next zero point is derived. If so, avoid turning on the first switching means again! This eliminates the need to turn on the power supply when negative overcurrent conditions such as old etc. are released, reducing maintenance work for inspection workers. It is very easy to do the following (1) to provide a protection circuit for an AC ntl closed circuit.
第1図は実施例の回路図、第2図は第1図の動作を説明
するだめのタイムチャートである。
1・・・交流電源、2・・・負荷。
3・・・近接スイッチ。
33・・・第1のスイッチング手段。
35・・・過電流検知用抵抗。
36・・・第2のスイッチング手段。
41・・・近接スイッチ回路。
42・・何・リガ回路。
1’l F+4r出願人 立石電檄株式会君手 続 補
正 書 (自発)
昭和 年 月 日
特r1庁艮宮殿
1、事件の表示
昭和5931−特許願第75520号
2、光明の名称
交流量(スj器の保訛回路
3、補■をづ−る者
事件どの関係 特許出願人
住所ψ 61G京都市右京区花園土堂町10番地連絡先
東京技術渉外室 03 (43G) 71844、補
正の対象
(1)明細山の特許請求の範囲、おJ、び弁明の詳(特
願昭59−75520号)
(1) 明細書の特許請求の範囲を別紙の通り補正覆る
。
(2) 明細四組2ページ第8行から第9行の[電源の
入力を行なわなければならず」を「電源を一度切って再
度投入しな番)ればならず」に補正する。
(3)同第2ページ第14行の「記スイツヂング手段」
を[上記スイッチング手段]に補正する。
(4)同第2ページ第16行の1−入切」を1゛切断J
シよび再投入」に補正する。
(5)同第8ページ第9行から第13行の1−第1のス
イッチング手段の〜したので、」を[第1のスイッチン
グ手段をオフ状態にし、その後筒2のスイッチング手段
がオフ状態になって1〜リ力回路からトリガ信号が導出
されたとき過電流状態が解除されていれば再度第1のス
イッチング手段をオンさせるようにしたので、」に補正
する。
(特願昭59−75520号)
特許請求の範囲
(1)負荷電流制御用の第1のスイッチング手段と、こ
の、1のスイッチング手段のオン時負荷にン(816過
電流を検知するための抵抗と、この抵抗に生じる電圧が
所定の値に達したときオンして前記第1のスイッチング
手段をオフさゼる第2のスイッチング手段と1,1のス
イッチング“手L【交流のゼロ点でトリガ信号を与える
トリガ回路とを備えたことを特徴とする交流開閉回路の
保護回路。
特許出願人 立石電機株式会社FIG. 1 is a circuit diagram of the embodiment, and FIG. 2 is a time chart for explaining the operation of FIG. 1. 1...AC power supply, 2...load. 3...Proximity switch. 33...first switching means. 35...Resistance for overcurrent detection. 36...Second switching means. 41... Proximity switch circuit. 42...what Riga circuit. 1'l F+4r Applicant Tateishi Denjo Co., Ltd. Proceeding Amendment (self-motivated) Showa year/month Nippon Express R1 Agency Ai Palace 1, case display 1983-Patent Application No. 75520 2, name exchange amount of Komyo ( What is the relationship between Suji's accent protection circuit 3 and the case of the person who created the supplementary name? Patent applicant address ψ 61G 10 Hanazono Tsuchido-cho, Ukyo-ku, Kyoto-shi Contact information Tokyo Technical Relations Office 03 (43G) 71844, subject of amendment ( 1) Details of the claims, OJ, and defense in the specification (Japanese Patent Application No. 59-75520) (1) The claims in the specification are amended and covered as shown in the attached sheet. (2) Set of 4 specifications 2 In the 8th to 9th lines of the page, "power must be input" is corrected to "must turn off the power and then turn it on again". (3) “Switching means” on page 2, line 14
is corrected to [the above switching means]. (4) Cut 1゛ from ``1-on-off'' on the 16th line of the second page.
Correct to ``reload and reload''. (5) In the same page 8, lines 9 to 13, 1--Since the first switching means did..., change the first switching means to the OFF state, and then the switching means of the tube 2 to the OFF state. Therefore, if the overcurrent condition has been canceled when the trigger signal is derived from the repowering circuit, the first switching means is turned on again, so the correction is made to 1. (Japanese Patent Application No. 59-75520) Claims: (1) A first switching means for controlling load current; and a second switching means that turns on and turns off the first switching means when the voltage generated in this resistor reaches a predetermined value; A protection circuit for an AC switching circuit characterized by comprising a trigger circuit that gives a signal.Patent applicant: Tateishi Electric Co., Ltd.
Claims (1)
この第1のスイッチング素子に直列に接続され第1のス
イッチング手段の過電流を検知するだめの抵抗と、この
抵抗に生じる電圧が所定の値に達したときオンして前記
第1のスイッチング手段のトリガ端子を接地する第2の
スイッチング手段と、前記トリガ端子に交流のゼロ点で
トリガ信号を与えるトリガ回路とを備えたことを特徴と
する交流開閉回路の保護回路。(1) A first switching means for controlling load current, etc.
A resistor is connected in series with the first switching element to detect overcurrent of the first switching means, and when the voltage generated in this resistor reaches a predetermined value, the resistor is turned on and the first switching means is turned on. 1. A protection circuit for an AC switching circuit, comprising: second switching means for grounding a trigger terminal; and a trigger circuit for applying a trigger signal to the trigger terminal at a zero point of AC.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7552084A JPS6068415A (en) | 1984-04-13 | 1984-04-13 | Protecting circuit of ac switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7552084A JPS6068415A (en) | 1984-04-13 | 1984-04-13 | Protecting circuit of ac switch |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6918177A Division JPS544346A (en) | 1977-06-11 | 1977-06-11 | Protective circuit for ac switching circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6068415A true JPS6068415A (en) | 1985-04-19 |
Family
ID=13578585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7552084A Pending JPS6068415A (en) | 1984-04-13 | 1984-04-13 | Protecting circuit of ac switch |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6068415A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63246613A (en) * | 1987-03-31 | 1988-10-13 | Tokyo Keiki Co Ltd | Position measuring apparatus |
-
1984
- 1984-04-13 JP JP7552084A patent/JPS6068415A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63246613A (en) * | 1987-03-31 | 1988-10-13 | Tokyo Keiki Co Ltd | Position measuring apparatus |
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