JPS6211162Y2 - - Google Patents
Info
- Publication number
- JPS6211162Y2 JPS6211162Y2 JP1514379U JP1514379U JPS6211162Y2 JP S6211162 Y2 JPS6211162 Y2 JP S6211162Y2 JP 1514379 U JP1514379 U JP 1514379U JP 1514379 U JP1514379 U JP 1514379U JP S6211162 Y2 JPS6211162 Y2 JP S6211162Y2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- frequency
- power
- power source
- relay
- 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.)
- Expired
Links
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims 2
- 230000007423 decrease Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Landscapes
- Protection Of Transformers (AREA)
Description
【考案の詳細な説明】
本考案は定電圧発電機等の交流電源によつて動
作する機器の保護回路に関し、特に電源周波数の
異常低下に起因する機器の損傷を未然に防ぐ保護
回路に関する。[Detailed Description of the Invention] The present invention relates to a protection circuit for equipment operated by an alternating current power source such as a constant voltage generator, and more particularly to a protection circuit for preventing damage to equipment caused by an abnormal drop in power frequency.
交流電源がエンジンまたはモーター等を動力源
とする定電圧交流発電機の場合、これを電源とし
て動作する機器であつて、その内部にトランスや
モーター等の交流の励磁回路が使用されている場
合に機器の電源入力を「断」とする前に発電用動
力源の停止操作をすると、発電機の回転数の低下
とともに周波数が低下する。しかし、定電圧発電
機のため電圧低下は周波数低下より小さいため機
器内部のトランス等の励磁電流が増加し、コアな
どの磁気回路が飽和する場合がある。飽和の状態
は、インダクタンスが非常に小さく、短絡に近い
状態であり、この場合は、過大電流が流れ、電源
入力回路にヒユーズが挿入されているとヒユーズ
は溶断する。機器を再び動作させるためには、ヒ
ユーズの交換をすれば良いのは当然でも、機器を
使用している周囲の条件によつては、特に機器が
航空機にとう載されている場合などには交換が容
易でないこともある。 In the case of a constant voltage alternator whose AC power source is an engine or motor, etc., the device operates using this as a power source, and if an alternating current excitation circuit such as a transformer or motor is used inside. If you stop the power source for power generation before turning off the power input to the device, the frequency will drop as the rotation speed of the generator decreases. However, since it is a constant voltage generator, the voltage drop is smaller than the frequency drop, so the excitation current of the transformer etc. inside the device increases, and the magnetic circuit such as the core may become saturated. In a saturated state, the inductance is very small and is close to a short circuit. In this case, an excessive current flows and if a fuse is inserted in the power input circuit, the fuse will blow. Of course, replacing the fuse is a good idea to get the device working again, but depending on the surrounding conditions in which the device is used, it may be necessary to replace it, especially if the device is mounted on an aircraft. Sometimes it's not easy.
第1図は、交流電源によつて動作する機器の電
源接続の一例を示すものである。定電圧交流電源
1からスイツチ2及びヒユーズ3を通して内部に
トランス等を使用した機器である負荷4が接続さ
れる。 FIG. 1 shows an example of a power supply connection for equipment operated by an AC power supply. A load 4, which is a device using a transformer or the like inside, is connected from a constant voltage AC power supply 1 through a switch 2 and a fuse 3.
第2図は、交流電源と直流電源を使用する機器
の接続例を示すもので、電源の「接」、「断」をリ
レー50を介してスイツチ9で行うようにしたも
ので遠隔操作を行う場合に多く見られる接続であ
る。定電圧交流源1及び直流電源6の出力はスイ
ツチ2及び7、ヒユーズ3及び8、リレー50の
メーク接点である接片53、接点54及び56,
57を通して負荷4に供給される。リレー50の
両メーク接点は少なくともスイツチ7が閉じてい
れば、スイツチ9を閉じることによりコイル51
で接点53は52から54に接続され、接点56
は接点55から57へ接続される。いずれの場合
も定電圧交流電源の周波数が低下するに従つて、
第3図の曲線aのように次第に励磁電流が増加し
d点に近づくと急激に増え、ヒユーズ3の容量を
上回る過大電流となり、やがてヒユーズは溶断す
る。 Fig. 2 shows an example of a connection for equipment using AC and DC power sources, in which the power source is turned on and off by switch 9 via relay 50, and is a connection often seen in remote control applications. The outputs of constant voltage AC source 1 and DC source 6 are connected to switches 2 and 7, fuses 3 and 8, contact piece 53 which is the make contact of relay 50, contacts 54 and 56,
The load 4 is supplied with current through the coil 51 by closing the switch 9, at least when the switch 7 is closed.
Contact 53 is connected to 52 through 54, and contact 56 is connected to
is connected from contact 55 to 57. In either case, as the frequency of the constant voltage AC power source decreases,
As shown by curve a in FIG. 3, the exciting current gradually increases and increases suddenly as it approaches point d, becoming an excessive current that exceeds the capacity of the fuse 3, and eventually the fuse melts.
本考案は、このような誤操作のために起る電源
周波数の低下から機器を保護する手段として、電
源の異常周波数低下を検知し、リレー等によつて
電源から機器を切り離くような保護回路を提供
し、電源が正常に戻つた場合は、機器を容易に再
び動作させることができるようにすることを目的
とする。 As a means of protecting equipment from drops in power supply frequency caused by such erroneous operations, the present invention proposes a protection circuit that detects an abnormal drop in the frequency of the power supply and disconnects the equipment from the power supply using a relay or the like. The purpose is to provide a system that allows the equipment to be easily operated again when the power returns to normal.
次に本考案の実施例について図面を用いて説明
する。第4図は、従来回路の一例として示した第
1図に本考案の保護回路を適用した例を示すもの
である。電源周波数が正常な場合、可飽和コイル
101は、インピーダンスが抵抗102に比して
非常に高くなつており、リレー110の駆動コイ
ルにかかる電圧が小さく接片113及び116は
図の示す位置にあり、負荷4に電源1から電力が
供給されている。電源周波数が低下してくると、
可飽和コイル101のインピーダンスが次第に小
さくなり、飽和点に近づくと急激にインピーダン
スが下がり、抵抗102の両端の電圧がリレー1
10を動作させるに十分な値となると、接片11
3及び116は、それぞれ接点114及び117
に接続される。接片113が接点112から離れ
たことにより機器への電力の供給は停止され、可
飽和コイル101への電流の供給も停止され、可
飽和コイルにさらに過大電流が流れることを防止
し接片116が接点117に接がることによりリ
レー110の駆動コイル111に電源から電流が
供給されて、リレー110は、電源1の出力電圧
が小さくなるまで保持される。 Next, embodiments of the present invention will be described using the drawings. FIG. 4 shows an example in which the protection circuit of the present invention is applied to the conventional circuit shown in FIG. 1 as an example. When the power supply frequency is normal, the impedance of the saturable coil 101 is much higher than that of the resistor 102, the voltage applied to the drive coil of the relay 110 is small, and the contacts 113 and 116 are in the positions shown in the figure. , power is supplied to the load 4 from the power supply 1. As the power frequency decreases,
The impedance of the saturable coil 101 gradually decreases, and when it approaches the saturation point, the impedance decreases rapidly, and the voltage across the resistor 102 decreases to the relay 1.
When the value is sufficient to operate 10, the contact piece 11
3 and 116 are contacts 114 and 117, respectively.
connected to. When the contact piece 113 separates from the contact point 112, the supply of power to the device is stopped, and the supply of current to the saturable coil 101 is also stopped, preventing further excessive current from flowing through the saturable coil. By contacting the contact 117, current is supplied from the power source to the drive coil 111 of the relay 110, and the relay 110 is held until the output voltage of the power source 1 becomes small.
第4図では省略してあるが駆動コイル111と
並列にツエナーダイオードが接続され、抵抗10
5の値を小さくすれば電源1の出力電圧がかなり
小さくなるまでリレー110が保持されることは
明らかである。尚、ダイオード103,106は
リレー110が直流電源用である場合に交流を整
流する目的で使用されるものであり、コンデンサ
104は平滑用コンデンサで両者とも交流電源用
のリレーを用いるときには不要である。 Although omitted in FIG. 4, a Zener diode is connected in parallel with the drive coil 111, and a resistor 10
It is clear that if the value of 5 is made small, the relay 110 will be held until the output voltage of the power supply 1 becomes considerably small. Note that the diodes 103 and 106 are used for the purpose of rectifying alternating current when the relay 110 is for a direct current power supply, and the capacitor 104 is a smoothing capacitor and both are unnecessary when using a relay for an alternating current power supply. .
第5図は、従来回路の他の例として示した第2
図に本考案の保護回路を適用した他の実施例であ
る。電源周波数低下によつてリレー110が動作
すると、負荷4への電力供給を停止するのに、リ
レー50を動作させて間接的に行うこととリレー
110の保持に直流電源6から直流電流を供給す
るようにした以外は、第4図の実施例と同じであ
る。但し、この場合、スイツチ7が「接」の状態
になつている間は、リレー110は保持される。 FIG. 5 shows a second circuit shown as another example of the conventional circuit.
The figure shows another embodiment in which the protection circuit of the present invention is applied. When the relay 110 operates due to a decrease in the power supply frequency, the power supply to the load 4 is stopped by operating the relay 50 indirectly, and the DC power supply 6 supplies DC current to hold the relay 110. The embodiment is the same as the embodiment shown in FIG. 4 except that it is changed as shown in FIG. However, in this case, the relay 110 is held while the switch 7 is in the "closed" state.
以上説明したように本考案は電源の周波数低下
を検知する手段として用いる可飽和コイルは機器
内部に使用しているトランス等の磁気回路の励磁
電流対周波数特性に近い特性をもつ磁気材料を用
いるものであり、第3図曲線bに示すごとく、機
器内部のトランス等の曲線aより少し高めの周波
数で飽和するように作られたものである。この可
飽和コイルの一方は、交流電源の一方に接続され
他方は抵抗を通して交流電源の他方に接続され、
可飽和コイルと抵抗の接続点から必要により整流
用のダイオードを通して、2回路のメイク、ブレ
ーク両接点をもつリレーの駆動コイルの一方に接
続され、駆動コイルの他方は電源の他方に接続さ
れ、必要によつて前記ダイオードが挿入された場
合は平滑用コンデンサを駆動コイルと並列に接続
する。リレーの1つのブレーク接点は、電源と負
荷である機器を接続するように使用し、メイク接
点は電源が抵抗を通して駆動コイルの一方に接続
されるように構成することによつて本考案の保護
回路が得られる。但し2回路のメイク、ブレーク
両接点のあるリレーの代わりに同じ機能をもつ他
の手段によつても良いことはもちろんである。以
上のように、可飽和コイルの飽和する周波数を機
器内部に使用しているトランスあるいはモーター
等の励磁回路が飽和する周波数より少し高く設定
し、この可飽和コイルの周波数の低下によるイン
ピーダンスの低下を電流の変化としてとらえこれ
をさらに電圧の変化に変換することによりリレー
を駆動して電源周波数の異常低下に対して機器を
保護することができ、誤操作に対処できる。実施
例における可飽和コイルの他の一方と交流電源の
他の一方間に接続される抵抗を、励磁電流による
飽和点を可飽和コイルより低い周波数に設定され
たトランス、あるいはコンデンサに置き換えても
本考案は構成できるし、電源回路を「接」、「断」
するリレーを同じ機能を持つ他のスイツチング回
路を用いても本考案を構成することができる。ま
た、定電圧交流電源の負荷となる機器内部にトラ
ンスあるいはモーター等が使われない場合であつ
ても電源周波数の異常低下によつて引き起される
かもしれない不具合から機器を保護するためにも
本考案の保護回路を適用することは有効である。 As explained above, in the present invention, the saturable coil used as a means for detecting a drop in the frequency of the power supply uses a magnetic material that has characteristics close to the excitation current vs. frequency characteristics of the magnetic circuit such as a transformer used inside the device. As shown in curve b in Figure 3, it is made to saturate at a slightly higher frequency than curve a of the transformer inside the device. One of the saturable coils is connected to one side of the AC power source, and the other is connected to the other side of the AC power source through a resistor.
The connection point between the saturable coil and the resistor is connected to one of the drive coils of the relay, which has two circuit make and break contacts, through a rectifier diode if necessary, and the other drive coil is connected to the other side of the power supply. When the diode is inserted, a smoothing capacitor is connected in parallel with the drive coil. One break contact of the relay is used to connect the power source and the equipment that is the load, and the make contact is configured so that the power source is connected to one side of the drive coil through a resistor, thereby implementing the protection circuit of the present invention. is obtained. However, it is of course possible to use other means having the same function instead of a relay having two circuits with both make and break contacts. As mentioned above, the frequency at which the saturable coil saturates is set slightly higher than the frequency at which the excitation circuit of the transformer or motor used inside the device saturates, and the impedance decreases due to the decrease in the frequency of the saturable coil. By capturing this as a change in current and converting it into a change in voltage, it is possible to drive a relay and protect equipment from abnormal drops in power frequency, making it possible to deal with erroneous operation. Even if the resistor connected between the other side of the saturable coil and the other side of the AC power supply in the embodiment is replaced with a transformer or a capacitor whose saturation point due to the exciting current is set to a lower frequency than that of the saturable coil, the present invention will not change. The idea can be configured, and the power supply circuit can be connected or disconnected.
The present invention can also be constructed by using other switching circuits having the same function as the relays. In addition, even if a transformer or motor is not used inside the equipment that loads the constant voltage AC power supply, it is also necessary to protect the equipment from malfunctions that may be caused by an abnormal drop in the power supply frequency. It is effective to apply the protection circuit of the present invention.
第1図は交流電源によつて動作する機器の電源
接続の一例を示す図、第2図は、交流電源と直流
電源を使用する機器の接続例を示す図で、電源の
「接」、「断」をリレーを介して行う場合の例であ
り、第3図は、通常のトランス等の供給電圧が一
定の場合の周波数と励磁電流の関係を示す図、第
4図は第1図の従来回路に本考案を適用した一実
施例を示す図、第5図は第2図の従来回路に本考
案を適用した一実施例を示す図である。
1……定電圧交流電源、2……スイツチ、3…
…ヒユーズ、4……交流電源によつて動作する機
器(負荷)、50,110……リレー。
Figure 1 is a diagram showing an example of a power supply connection for equipment that operates on an AC power supply, and Figure 2 is a diagram showing an example of a connection between equipment that uses an AC power supply and a DC power supply. Figure 3 is a diagram showing the relationship between frequency and excitation current when the supply voltage of a normal transformer, etc. is constant, and Figure 4 is a diagram showing the relationship between the frequency and excitation current when the supply voltage of a normal transformer, etc. is constant. FIG. 5 is a diagram showing an embodiment in which the present invention is applied to a circuit. FIG. 5 is a diagram showing an embodiment in which the present invention is applied to the conventional circuit shown in FIG. 1... Constant voltage AC power supply, 2... Switch, 3...
... Fuse, 4 ... Equipment (load) operated by AC power supply, 50, 110 ... Relay.
Claims (1)
が周波数の低下より小さい定電圧発電機のような
交流電源の両端に接続され、印加交流電圧が一定
のもとで対周波数インピーダンス変化特性が磁気
飽和のため非直線部分を有する可飽和コイルと、
この可飽和コイルに流れる電流が予め定めた値以
上であることを検知する検知手段と、この検知手
段の出力により動作し、前記電流の異常増加によ
つて前記電源からこの電源を電力源として用いて
いる機器を切り離すスイツチング手段とを具備す
ることを特徴とする電源周波数の異常低下に対す
る保護回路。 Connected to both ends of an AC power source such as a constant voltage generator, where the drop in output voltage due to fluctuations in the rotation speed of the power source is smaller than the drop in frequency, the impedance change characteristics with respect to frequency are magnetic when the applied AC voltage is constant. a saturable coil having a non-linear portion due to saturation;
A detection means detects that the current flowing through the saturable coil is equal to or higher than a predetermined value, and the output of the detection means is activated, and when the current increases abnormally, the power supply is used as a power source from the power supply. A protection circuit against an abnormal drop in power frequency, characterized in that it is equipped with switching means for disconnecting equipment that is connected to the power supply.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1514379U JPS6211162Y2 (en) | 1979-02-08 | 1979-02-08 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1514379U JPS6211162Y2 (en) | 1979-02-08 | 1979-02-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55115238U JPS55115238U (en) | 1980-08-14 |
JPS6211162Y2 true JPS6211162Y2 (en) | 1987-03-16 |
Family
ID=28836323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1514379U Expired JPS6211162Y2 (en) | 1979-02-08 | 1979-02-08 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6211162Y2 (en) |
-
1979
- 1979-02-08 JP JP1514379U patent/JPS6211162Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS55115238U (en) | 1980-08-14 |
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