JP3719527B2 - Latch type relay circuit - Google Patents
Latch type relay circuit Download PDFInfo
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- JP3719527B2 JP3719527B2 JP31226494A JP31226494A JP3719527B2 JP 3719527 B2 JP3719527 B2 JP 3719527B2 JP 31226494 A JP31226494 A JP 31226494A JP 31226494 A JP31226494 A JP 31226494A JP 3719527 B2 JP3719527 B2 JP 3719527B2
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- Prior art keywords
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Description
【０００１】
【産業上の利用分野】
本発明は、閉用励磁コイルにより閉となり開用励磁コイルにより開となるラッチ型リレー回路に関する。
【０００２】
【従来の技術】
スイッチを閉にする閉用励磁コイルおよび開にする開用励磁コイルにより開閉されるラッチ型リレーと、開となるようにバネで付勢されており、閉にするためには閉用励磁コイルで閉にしている間持続して励磁電流を流し、開にするときこの励磁電流を遮断するようにしたノンラッチ型リレーがある。一般にはノンラッチ型リレーが用いられる。これは電源が事故などで遮断された場合、自動的にリレーは開となるので安全性が高いためである。
【０００３】
【発明が解決しようとする課題】
宇宙空間などで負荷に電源から電流を供給ための主スイッチにはラッチ型リレーが用いられる。これは大きな電流、例えば５０アンペアを遮断するスイッチとなると、ノンラッチ型リレーの場合、スイッチを閉としている期間連続して使用している閉用励磁コイルで消費される電力が大きくなるためである。ラッチ型リレーの場合、オン、オフ指令によって閉用励磁コイル、開用励磁コイルにより開閉される期間のみ各励磁コイルに通電されるので、励磁コイルによる消費電力は少ない。しかし、このため閉となっているときに事故などで電源が遮断さたときは、閉の状態が維持される。なお、負荷への電流を供給する場合、最初は少しづつとしある程度流してから、主スイッチを投入してラッシュ電流を押さえるようにするソフトスタート方式が一般に採用され負荷を保護している。
【０００４】
図２はラッチ型リレーを負荷への主スイッチとした回路の一例を示す。主スイッチ１は直流電源を負荷Ｃ１に接続する。閉用励磁コイル２、開用励磁コイル３は主スイッチ１をそれぞれ閉、または開とする。制御スイッチＬＲはオン信号でセット端子Ｓに接続し、抵抗Ｒ１により電流を制限しながら負荷Ｃ１に電流を供給する。この電流によりトランジスタＱ１、Ｑ２はオンする。Ｑ２がオンするとＦ点の電位は０となるのでトランジスタＱ３はオンしない。負荷Ｃ１の電位が電源の電位に近くなると流れ込む電流が止まり、Ｑ１、Ｑ２はオフとなるため、Ｆ点の電位が正となりＱ３がオンし、閉用励磁コイル２が作動して主スイッチ１はオンとなる。この場合負荷Ｃ１は充電されているのでラッシュ電流は生じない。しかし電源が遮断されると主スイッチ１はオンの状態のままであり、電源が復帰したときラッシュ電流が流れる。このように、ラッチ型リレーで事故などで電源が遮断され閉の状態で電源が復帰したときソフトスタート方式は行われず、ラッシュ電流が発生するという問題がある。
【０００５】
本発明はかかる問題点に鑑みてなされたもので、ラッチ型リレーを電源遮断時強制的に開放するラッチ型リレー回路を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するため、スイッチを閉にする閉用励磁コイルおよび開にする開用励磁コイルにより開閉され負荷に電流を供給する主スイッチと、オン信号でセット端子に電源を接続しオフ信号でリセット端子に電源を接続する制御スイッチと、該制御スイッチがセット端子に接続されると前記負荷に抵抗を介して電流を供給し所定の量に達すると閉用励磁コイルを励磁して主スイッチを閉とし、この閉により流れる電流によって閉用励磁コイルへの通電を遮断する閉用回路と、主スイッチが閉となり通過する電流によって動作して制御スイッチのリセット端子と開用励磁コイルを導通させ、オフ信号で制御スイッチがリセット端子に電源を接続すると主スイッチを開とする第１リレーとを備えたラッチ型リレー回路において、電源より充電される充電部と、電源が遮断されると充電部から電流を流して開用励磁コイルを励磁し主スイッチを開とする第２リレーとを備える。
【０００７】
【作用】
制御スイッチにオン信号がくると抵抗を介して電流が負荷に徐々に供給され、負荷が充電されてくると、閉用励磁コイルに通電され、主スイッチがオンする。これにより主スイッチオン時ラッシュ電流は流れない。また、主スイッチに流れる電流で閉励磁コイルへの通電が止まるともに、第１リレーにより開励磁コイルは制御スイッチのリセット端子に接続される。これにより制御スイッチにオフ信号がくれば、開励磁コイルに通電され主スイッチは開となる。充電部は電源より充電されており、第２リレーは電源が遮断されると開励磁コイルに充電部の電流を通電して開励磁コイルを作動させ、主スイッチを開とする。これにより電源が復帰したとき、主スイッチは開となっているので、負荷への電流供給は制御スイッチにより行われることになり、ラッシュ電流の発生を防止できる。
【０００８】
【実施例】
以下、本発明の実施例について図面を参照して説明する。
図１は本発明の実施例の構成を示す回路図である。図２と同一符号は同一の意味を表す。電源は直流でＡは正端子、Ｂは負端子である。主スイッチ１は閉励磁コイル２により閉となり、開励磁コイル３により開となる。両励磁コイル２、３にはツェナダイオードＺが直列に２個設けられ、各１５Ｖ（ボルト）づつでコイルが３０Ｖの電位となるようにしている。直列に配置されたダイオードＤはコイルからの逆電圧がツェナダイオードＺに印加されないようにする。負荷Ｃ１は容量性を有するものとする。Ｑ１、Ｑ２、Ｑ３はトランジスタでスイッチとして動作する。制御スイッチＬＲはオン信号により電源をセット端子Ｓに接続し、オフ信号により電源をリセット端子Ｒに接続する。
【０００９】
第１リレーＲＹ１は主スイッチが閉となると開励磁コイル３と制御スイッチＬＲのリセット端子Ｒを接続し、開となると遮断する。充電部Ｃ２はコンデンサで直列のツェナダイオードＺとダイオードＤに並列に接続されている。ツェナダイオードＺは充電部Ｃ２を３０Ｖに保ち、ダイオードＤは励磁コイル２、３からの逆電圧を阻止する。第２リレーＲＹ２は電源に接続され、ツェナダイオードＺにより３０Ｖの電圧で励磁され、電源が遮断されるとリセット端子Ｒに接続されて開励磁コイル３と充電部Ｃ２を接続し、開励磁コイル３を作動させ主スイッチ１を開とする。第１リレーＲＹ１と第２リレーＲＹ２はいずれも、主スイッチ１のような大きな電流は流れないので、ノンラッチ型リレーとしている。
【００１０】
次に動作について説明する。
制御スイッチＬＲにオン信号がくると、電源はセット端子Ｓに接続され、抵抗Ｒ１を通り電流が負荷Ｃ１に徐々に流入する。この電流によりトランジスタＱ１、Ｑ２はオンするが、Ｑ２のオンによりＦ点の電位は０となるのでＱ３はオンしない。負荷Ｃ１の充電が進み電位が電源に近くなると負荷Ｃ１への電流も止まり、Ｑ１、Ｑ２はオフする。するとＦ点は正の電位となるのでＱ３がオンし、閉励磁コイル２が作動して主スイッチ１は閉となる。このとき負荷Ｃ１は充電しているのでラッシュ電流は流れない。主スイッチ１が閉となるとリレーＲＹ１が励磁されそのセット端子Ｓに接続され、制御スイッチＬＲがオフ信号でリセット端子Ｒに接続されれば、開励磁コイル３に通電し主スイッチ１を開とする状態になる。
【００１１】
充電部Ｃ２は電源に常に接続されているので、ツェナダイオードＺにより３０Ｖで充電されている。また、第２リレーＲＹ２も電源に接続されており、セット端子Ｓに接続している。このような状態で、事故などにより電源が遮断されると、第２リレーＲＹ２は励磁がなくなりリセット端子Ｒに接続し、充電部Ｃ２からの電流が開励磁コイル３に流れ主スイッチ１を開にする。これにより電源が復帰しても負荷Ｃ１に電流が流れることはない。電源が復帰すると充電部Ｃ２は放出した電流の充電を行い、第２リレーＲＹ２は励磁を開始しセット端子Ｓに接続して、充電部Ｃ２と開励磁コイル３との接続を遮断する。これにより制御スイッチＬＲによる主スイッチ１のソフトスタートが可能になる。
【００１２】
【発明の効果】
以上の説明から明らかなように、本発明は、スイッチを閉にする閉用励磁コイルおよび開にする開用励磁コイルにより開閉されるラッチ型リレーに、充電部と第２リレーを設け、電源が遮断されたときは第２リレーにより充電部の電流で開励磁コイルを用いてスイッチを開とするようにしたので、電源復帰にスイッチを通して負荷にラッシュ電流が流れるのを防止することができる。また閉用励磁コイルおよび開用励磁コイルにはスイッチを開閉するときのみ励磁電流を流せばよいので、ノンラッチ型リレーを使用する通常の方式に対して、消費電力が少なくて済み、宇宙機器等の電力リソースを制限される装置に適している。
【図面の簡単な説明】
【図１】本発明の実施例のリレー回路を示す図である。
【図２】従来のラッチ型リレー回路を示す図である。
【符号の説明】
１ 主スイッチ
２ 閉励磁コイル
３ 開励磁コイル
Ａ 電源正端子
Ｂ 電源負端子
Ｃ１ 負荷
Ｃ２ 充電部
ＬＲ 制御スイッチ
ＲＹ１ 第１リレー
ＲＹ２ 第２リレー
Ｑ１，Ｑ２，Ｑ３ トランジスタ（閉用回路）
Ｄ ダイオード
Ｚ ツェナダイオード
Ｒ１ 抵抗
Ｓ セット端子
Ｒ リセット端子[0001]
[Industrial application fields]
The present invention relates to a latch-type relay circuit that is closed by a closing exciting coil and opened by an opening exciting coil.
[0002]
[Prior art]
A latching relay that is opened and closed by a closing exciting coil that closes the switch and an opening exciting coil that opens, and a spring that is energized so as to be opened. There is a non-latch type relay in which an exciting current is allowed to flow continuously while being closed and this exciting current is cut off when being opened. In general, a non-latch type relay is used. This is because when the power supply is cut off due to an accident or the like, the relay is automatically opened, so that safety is high.
[0003]
[Problems to be solved by the invention]
A latch-type relay is used as a main switch for supplying current from a power source to a load in outer space. This is because when a switch that cuts off a large current, for example, 50 amperes, in the case of a non-latch type relay, the power consumed by the closing exciting coil that is continuously used while the switch is closed increases. In the case of a latch-type relay, each excitation coil is energized only during the period when it is opened and closed by the closing excitation coil and the opening excitation coil in response to an on / off command, so that power consumption by the excitation coil is small. However, when the power supply is shut off due to an accident or the like when it is closed, the closed state is maintained. When supplying a current to the load, a soft start method is generally employed to protect the load by applying a small amount of current at first and then turning on the main switch to suppress the rush current.
[0004]
FIG. 2 shows an example of a circuit in which a latch-type relay is used as a main switch to a load. The main switch 1 connects a DC power source to the load C1. The closing exciting coil 2 and the opening exciting coil 3 close or open the main switch 1, respectively. The control switch LR is connected to the set terminal S by an ON signal, and supplies current to the load C1 while limiting the current by the resistor R1. The transistors Q1 and Q2 are turned on by this current. When Q2 is turned on, the potential at point F becomes 0, so transistor Q3 is not turned on. When the potential of the load C1 becomes close to the potential of the power supply, the flowing current stops and Q1 and Q2 are turned off. Therefore, the potential at the point F becomes positive, Q3 is turned on, the closing exciting coil 2 is activated, and the main switch 1 is Turn on. In this case, since the load C1 is charged, no rush current is generated. However, when the power supply is cut off, the main switch 1 remains on, and a rush current flows when the power supply is restored. As described above, when the power is cut off due to an accident or the like in the latch type relay and the power is restored in the closed state, the soft start method is not performed and a rush current is generated.
[0005]
The present invention has been made in view of such problems, and an object of the present invention is to provide a latch-type relay circuit that forcibly opens the latch-type relay when the power is shut off.
[0006]
[Means for Solving the Problems]
To achieve the above object, a main switch that is opened and closed by a closing exciting coil that closes the switch and an opening exciting coil that opens and supplies current to the load; A control switch for connecting a power supply to the reset terminal, and when the control switch is connected to the set terminal, a current is supplied to the load via a resistor, and when a predetermined amount is reached, the closing excitation coil is excited to switch the main switch The closing circuit that shuts off the energization to the closing exciting coil by the current that flows by this closing, and the main switch closes and operates by the passing current to make the reset terminal of the control switch and the opening exciting coil conductive. , in the latch type relay circuit having a first relay for the main switch open when the control switch-off signal to connect the power supply to the reset terminal, the charging from the power supply Comprising the charging unit, and a second relay for the main switch is energized the opening exciting coil by flowing a current from the charging unit and open when the power is shut off.
[0007]
[Action]
When an ON signal comes to the control switch, current is gradually supplied to the load via the resistor. When the load is charged, the closing exciting coil is energized and the main switch is turned ON. As a result, no rush current flows when the main switch is on. The energization of the closed excitation coil is stopped by the current flowing through the main switch, and the open excitation coil is connected to the reset terminal of the control switch by the first relay. As a result, when an off signal is received by the control switch, the open excitation coil is energized and the main switch is opened. The charging unit is charged by the power source, and when the power source is cut off, the second relay energizes the open excitation coil with the current of the charging unit to operate the open excitation coil and open the main switch. As a result, when the power is restored, the main switch is open, so that the current supply to the load is performed by the control switch, and the generation of the rush current can be prevented.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a circuit diagram showing a configuration of an embodiment of the present invention. The same reference numerals as those in FIG. 2 represent the same meaning. The power source is direct current, A is a positive terminal, and B is a negative terminal. The main switch 1 is closed by the closed excitation coil 2 and opened by the open excitation coil 3. The two exciting coils 2 and 3 are provided with two Zener diodes Z in series so that the coil has a potential of 30 V for each 15 V (volt). The diode D arranged in series prevents the reverse voltage from the coil from being applied to the Zener diode Z. The load C1 is assumed to be capacitive. Q1, Q2, and Q3 are transistors and operate as switches. The control switch LR connects the power source to the set terminal S by an on signal and connects the power source to the reset terminal R by an off signal.
[0009]
The first relay RY1 connects the open exciting coil 3 and the reset terminal R of the control switch LR when the main switch is closed, and shuts off when the main switch is opened. The charging unit C2 is connected in parallel to the series Zener diode Z and the diode D by a capacitor. Zener diode Z keeps charging part C2 at 30V, and diode D blocks reverse voltage from exciting coils 2 and 3. The second relay RY2 is connected to a power source and excited by a voltage of 30V by a Zener diode Z. When the power source is cut off, the second relay RY2 is connected to a reset terminal R to connect the open excitation coil 3 and the charging unit C2, and the open excitation coil 3 And the main switch 1 is opened. Both the first relay RY1 and the second relay RY2 are non-latching relays because a large current does not flow as in the main switch 1.
[0010]
Next, the operation will be described.
When an ON signal comes to the control switch LR, the power source is connected to the set terminal S, and the current gradually flows into the load C1 through the resistor R1. Although the transistors Q1 and Q2 are turned on by this current, the potential at the point F becomes 0 when Q2 is turned on, so that Q3 is not turned on. When charging of the load C1 proceeds and the potential approaches the power supply, the current to the load C1 also stops, and Q1 and Q2 are turned off. Then, since the point F becomes a positive potential, Q3 is turned on, the closed excitation coil 2 is activated, and the main switch 1 is closed. At this time, since the load C1 is charged, no rush current flows. When the main switch 1 is closed, the relay RY1 is excited and connected to the set terminal S. When the control switch LR is connected to the reset terminal R by an off signal, the open excitation coil 3 is energized to open the main switch 1. It becomes a state.
[0011]
Since the charging unit C2 is always connected to the power source, it is charged by the Zener diode Z at 30V. The second relay RY2 is also connected to the power source and is connected to the set terminal S. In this state, when the power supply is cut off due to an accident or the like, the second relay RY2 loses excitation and is connected to the reset terminal R, and the current from the charging unit C2 flows to the open excitation coil 3 to open the main switch 1. To do. As a result, even when the power is restored, no current flows through the load C1. When the power is restored, the charging unit C2 charges the released current, and the second relay RY2 starts excitation and connects to the set terminal S, thereby disconnecting the connection between the charging unit C2 and the open excitation coil 3. Thereby, the soft start of the main switch 1 by the control switch LR becomes possible.
[0012]
【The invention's effect】
As is apparent from the above description, the present invention provides a charging relay and a second relay in a latching relay that is opened and closed by a closing excitation coil that closes a switch and an opening excitation coil that opens a switch, When cut off, the switch is opened using the open exciting coil with the current of the charging unit by the second relay, so that it is possible to prevent the rush current from flowing through the switch to return to the power source. In addition, since the excitation current only needs to flow through the closing excitation coil and the opening excitation coil when the switch is opened and closed, the power consumption can be reduced compared to the normal method using a non-latch type relay. Suitable for devices with limited power resources.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a relay circuit according to an embodiment of the present invention.
FIG. 2 is a diagram showing a conventional latch-type relay circuit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main switch 2 Closed excitation coil 3 Open excitation coil A Power supply positive terminal B Power supply negative terminal C1 Load C2 Charging part LR Control switch RY1 1st relay RY2 2nd relay Q1, Q2, Q3 Transistor (close circuit)
D Diode Z Zener diode R1 Resistance S Set terminal R Reset terminal
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31226494A JP3719527B2 (en) | 1994-12-16 | 1994-12-16 | Latch type relay circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31226494A JP3719527B2 (en) | 1994-12-16 | 1994-12-16 | Latch type relay circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08171845A JPH08171845A (en) | 1996-07-02 |
| JP3719527B2 true JP3719527B2 (en) | 2005-11-24 |
Family
ID=18027154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31226494A Expired - Fee Related JP3719527B2 (en) | 1994-12-16 | 1994-12-16 | Latch type relay circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3719527B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111152B (en) * | 2018-02-23 | 2023-10-13 | 安徽安凯汽车股份有限公司 | Automatic switching circuit for passenger door test of passenger car |
-
1994
- 1994-12-16 JP JP31226494A patent/JP3719527B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08171845A (en) | 1996-07-02 |
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