JPH11136855A - Unbalanced lightning protection circuit - Google Patents
Unbalanced lightning protection circuitInfo
- Publication number
- JPH11136855A JPH11136855A JP31284497A JP31284497A JPH11136855A JP H11136855 A JPH11136855 A JP H11136855A JP 31284497 A JP31284497 A JP 31284497A JP 31284497 A JP31284497 A JP 31284497A JP H11136855 A JPH11136855 A JP H11136855A
- Authority
- JP
- Japan
- Prior art keywords
- lightning protection
- protection circuit
- unbalanced
- transmission line
- varistor
- 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
Landscapes
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は不平衡型雷保護回路
に関し、詳しくは伝送装置の送信部及び受信部おいて伝
送路を接続する回路に使用する不平衡型雷保護回路に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unbalanced lightning protection circuit, and more particularly to an unbalanced lightning protection circuit used for a circuit connecting a transmission line in a transmission section and a reception section of a transmission device.
【０００２】[0002]
【従来の技術】近年、オフィスや家庭にデジタル化、多
機能化、小型化された情報通信機器が多く使用されるよ
うになり、マルチメディア情報社会が進んでいる。しか
しその一方でそれらの装置は、高感度で低電力動作の電
子部品を数多く使用し、大規模な集積回路化も進んでい
る。これらの電子部品は、外来からの妨害波、例えば雷
サージのようなものを受けて破損しやすく、外来からの
妨害波が進入し易い伝送路を接続する回路に、雷対策の
保護回路を設けている。図２に従来の不平衡型雷保護回
路の構成例を示す。同図において、不平衡型雷保護回路
は、伝送路の線間に挿入し、もう一端をフレームグラン
ドに接続した三極避雷器であるアレスタＡＲＲ１と、二
つの素子を伝送路の線間に挿入しその中点をフレームグ
ランドに接続したバリスタＶ１、Ｖ２と、伝送路に対し
て夫々直列に挿入した二つの抵抗Ｒ１、Ｒ２とで構成す
る。又、Ｂ／Ｕ ＣＯＮＶ１とＵ／Ｂ ＣＯＮＶ２は夫
々伝送装置の受信部と送信部である。なお、アレスタは
規定以上の誘起電圧を放電吸収するよう機能し、又バリ
スタは両端子に印加される規定以上の電圧に対して低抵
抗とに機能するものである。2. Description of the Related Art In recent years, digitalized, multifunctional, and miniaturized information communication devices have been widely used in offices and homes, and the multimedia information society has advanced. However, on the other hand, these devices use a large number of electronic components with high sensitivity and low power operation, and large-scale integrated circuits are being developed. These electronic components are susceptible to damage from external disturbances, such as lightning surges, and are equipped with protection circuits for lightning protection in circuits that connect transmission lines through which external disturbances easily enter. ing. FIG. 2 shows a configuration example of a conventional unbalanced lightning protection circuit. In the figure, the unbalanced lightning protection circuit is inserted between the lines of the transmission line, and an arrester ARR1, which is a three-pole lightning arrester having the other end connected to the frame ground, and two elements inserted between the lines of the transmission line. The middle point is composed of varistors V1 and V2 connected to the frame ground, and two resistors R1 and R2 inserted in series with the transmission line, respectively. B / U CONV1 and U / B CONV2 are a receiving unit and a transmitting unit of the transmission device, respectively. The arrester functions to discharge and absorb an induced voltage higher than a specified value, and the varistor functions to have a low resistance to a specified voltage applied to both terminals.
【０００３】このように構成した不平衡型雷保護回路は
次のように動作する。先ず、接続する伝送路は不平衡伝
送路でこの例では同軸ケーブルである。雷保護回路の一
端は同軸ケーブルの信号線に接続し、もう一端はアース
線に接続する。又、信号の送信側の機器で同軸ケーブル
のアース線をシグナルグランドに接続し、受信側の機器
ではアース線はオープン状態である。これは両端接地す
ると機器の送信側と受信側を大地を経由して閉ループが
でき、その送信側と受信側に電位差が生じ雑音を発生す
るからである。この例に示す雷保護回路は、外部から進
入するサージ電圧に対して、一次素子としてアレスタ
を、二次素子としてバリスタを夫々使用している。伝送
路から誘導雷による電圧が誘起すると、アレスタＡＲＲ
１が放電を開始し電圧を放電電圧である所定の電圧にお
さえる。この時アレスタ１の放電開始動作に遅れ時間が
あり、この間放電開始電圧が上昇するので二次素子とし
てバリスタＶ１、Ｖ２を設置し、この電圧を吸収すると
ともにバリスタ電圧により放電電圧をさらに抑制してい
る。又、抵抗Ｒ１、Ｒ２はバリスタＶ１、Ｖ２の保護抵
抗である。[0003] The unbalanced lightning protection circuit thus configured operates as follows. First, the transmission line to be connected is an unbalanced transmission line, which is a coaxial cable in this example. One end of the lightning protection circuit is connected to the signal line of the coaxial cable, and the other end is connected to the ground line. The ground wire of the coaxial cable is connected to the signal ground in the device on the signal transmitting side, and the ground wire is open in the device on the receiving side. This is because when both ends are grounded, a closed loop is formed between the transmitting side and the receiving side of the device via the ground, and a potential difference is generated between the transmitting side and the receiving side to generate noise. The lightning protection circuit shown in this example uses an arrester as a primary element and a varistor as a secondary element for a surge voltage entering from the outside. When voltage due to induced lightning is induced from the transmission line, the arrester ARR
1 starts discharging and keeps the voltage at a predetermined voltage which is a discharging voltage. At this time, there is a delay time in the discharge start operation of the arrester 1, and during this time, the discharge start voltage rises. Therefore, varistors V1 and V2 are installed as secondary elements to absorb this voltage and further suppress the discharge voltage by the varistor voltage. I have. The resistors R1 and R2 are protection resistors for the varistors V1 and V2.
【０００４】[0004]
【発明が解決しようとする課題】近年、電子機器の増加
に伴い機器相互間のノイズ干渉による機器誤動作等が問
題となっている。そのため電子機器による電磁波の漏洩
の防止を目的に自主規制が行なわれている。しかしなが
ら、前述したような従来の雷保護回路では外部からの誘
導雷に対する保護はなされているが、自機器の発生する
電磁波が外部の機器に影響を与えること即ち、電磁妨害
波について対策がなされていなかった。本発明は、上述
した従来の雷保護回路の問題を解決するためになされた
ものであって、誘導雷に対する保護をするとともに電磁
妨害波についても対策された雷保護回路を提供すること
を課題とする。In recent years, with the increase in electronic devices, device malfunction due to noise interference between devices has become a problem. For this reason, voluntary regulations have been implemented for the purpose of preventing leakage of electromagnetic waves from electronic devices. However, in the conventional lightning protection circuit described above, protection against induced lightning from the outside is provided, but measures are taken to prevent electromagnetic waves generated by the own device from affecting external devices, that is, to prevent electromagnetic interference. Did not. The present invention has been made in order to solve the above-mentioned problems of the conventional lightning protection circuit, and has an object to provide a lightning protection circuit that protects against induced lightning and that also takes measures against electromagnetic interference. I do.
【０００５】[0005]
【課題を解決するための手段】本課題を達成するために
本発明による不平衡型雷保護回路は、不平衡型信号伝送
路の一方に直列に挿入する抵抗素子と、該抵抗素子の夫
々の端子と信号伝送路の他方との間に接続するアレスタ
回路及びバリスタ回路と、前記信号伝送路の他方とフレ
ームアース間を接続する第二のバリスタ回路とを備え、
前記アレスタ回路のアース端子をフレームアースに接続
するよう構成する。In order to achieve the above object, an unbalanced lightning protection circuit according to the present invention comprises a resistor inserted in series in one of unbalanced signal transmission lines, and a resistive element connected to each of the resistive elements. An arrester circuit and a varistor circuit connected between the terminal and the other of the signal transmission paths, and a second varistor circuit that connects between the other of the signal transmission paths and the frame ground,
The ground terminal of the arrester circuit is connected to a frame ground.
【０００６】[0006]
【発明の実施の形態】以下、本発明を図面に示した実施
例に基づいて詳細に説明する。図1は本発明による不平
衡型雷保護回路の一実施例を示す概略構成図である。同
図において不平衡型雷保護回路は、伝送路の線間に挿入
し、もう一端をフレームグランドに接続した三極避雷器
であるアレスタＡＲＲ１と、伝送路の線間に挿入したバ
リスタＶ１と、シグナルグランドとフレームグランドと
の間に挿入したバリスタＶ２と、伝送路に対して信号線
側に直列に挿入した抵抗Ｒ１とで構成する。又、Ｂ／Ｕ
ＣＯＮＶ１とＵ／Ｂ ＣＯＮＶ２は夫々伝送装置の受
信部と送信部である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of an unbalanced lightning protection circuit according to the present invention. In the figure, an unbalanced lightning protection circuit includes an arrester ARR1 which is a three-pole lightning arrester inserted between transmission line lines and the other end connected to a frame ground, a varistor V1 inserted between transmission line lines, and a signal It comprises a varistor V2 inserted between the ground and the frame ground, and a resistor R1 inserted in series on the signal line side with respect to the transmission line. Also, B / U
CONV1 and U / B CONV2 are a receiving unit and a transmitting unit of the transmission device, respectively.
【０００７】先ず、接続する伝送路は不平衡伝送路で本
例では同軸ケーブルである。雷保護回路の一端は同軸ケ
ーブルの信号線に接続し、もう一端はアース線に接続す
る。又、信号の送信側の機器で同軸ケーブルのアースを
接地し、受信側の機器ではアース線はオープン状態であ
る。これは両端接地すると機器の送信側と受信側を大地
を経由して閉ループができ、その送信側と受信側に電位
差が生じ雑音を発生するからである。本雷保護回路は、
外部から進入するサージ電圧に対して、一次素子として
アレスタを、二次素子としてバリスタを夫々使用してい
る。伝送路から誘導雷による電圧が誘起すると、アレス
タＡＲＲ１が放電を開始し電圧を放電電圧である所定の
電圧におさえる。この時アレスタＡＲＲ１の放電開始動
作に遅れ時間があり、この間放電開始電圧が上昇するの
で二次素子としてバリスタＶ１、Ｖ２を設置しこの電圧
を吸収するとともにバリスタ電圧により放電電圧をさら
に抑制している。又、抵抗Ｒ１はバリスタＶ１の保護抵
抗である。First, the transmission line to be connected is an unbalanced transmission line, which is a coaxial cable in this embodiment. One end of the lightning protection circuit is connected to the signal line of the coaxial cable, and the other end is connected to the ground line. Also, the ground of the coaxial cable is grounded in the device on the signal transmission side, and the ground wire is open in the device on the reception side. This is because when both ends are grounded, a closed loop is formed between the transmitting side and the receiving side of the device via the ground, and a potential difference is generated between the transmitting side and the receiving side to generate noise. The lightning protection circuit
An arrester is used as a primary element and a varistor is used as a secondary element for a surge voltage entering from the outside. When a voltage due to the induced lightning is induced from the transmission line, the arrester ARR1 starts discharging and keeps the voltage at a predetermined voltage which is a discharging voltage. At this time, there is a delay time in the discharge start operation of the arrester ARR1, and during this time the discharge start voltage rises, so that the varistors V1 and V2 are installed as secondary elements to absorb this voltage and further suppress the discharge voltage by the varistor voltage. . The resistor R1 is a protection resistor for the varistor V1.
【０００８】次に電磁妨害波について説明する。本発明
の対象となる電磁妨害波は、所定の周波数範囲内で雑音
が機器本体から直接放射する場合で、その測定は、決め
られた反射物のない広い測定場でアンテナを用いて雑音
の電界強度を測ることで行われる。電磁妨害波を防止す
る対策として知られているものは、シールド、接地、ノ
イズフィルタ、配線の分離と方向、回路自体の設計等が
あるが、本発明では、接地について対策を行なった。従
来の雷保護回路は、接続する伝送路がペアーケーブルの
ような平衡線路であっても又、同軸ケーブルのような不
平衡線路であっても従来の同じ雷保護回路を使用してい
た。そこで本発明では、従来の雷保護回路を不平衡伝送
路に整合するように抵抗Ｒ２を削除し、バリスタＶ１を
線間に、さらにバリスタＶ２をシグナルグランドとフレ
ームグランド間にそれぞれ挿入した。これにより雷保護
回路のシグナルグランドのインピーダンスは低くなり機
器本体から放射する電磁妨害波が低下する。Next, an electromagnetic interference wave will be described. The electromagnetic interference wave targeted by the present invention is a case where noise is directly radiated from the main body of the device within a predetermined frequency range, and the measurement is performed by using an antenna in a wide measurement field without a specified reflector. This is done by measuring the intensity. Known measures to prevent electromagnetic interference include shielding, grounding, noise filters, separation and direction of wiring, design of the circuit itself, and the like. In the present invention, countermeasures are taken for grounding. The conventional lightning protection circuit uses the same conventional lightning protection circuit whether the transmission line to be connected is a balanced line such as a pair cable or an unbalanced line such as a coaxial cable. Therefore, in the present invention, the resistor R2 is deleted so as to match the conventional lightning protection circuit with the unbalanced transmission line, and the varistor V1 is inserted between the lines and the varistor V2 is inserted between the signal ground and the frame ground. As a result, the impedance of the signal ground of the lightning protection circuit is reduced, and the electromagnetic interference emitted from the device body is reduced.
【０００９】[0009]
【発明の効果】本発明は上述したように、従来は不平衡
型電磁妨害波について何ら対策をとっていなかったが、
本発明によれば雷に対する保護とともに電磁妨害波につ
いても効果をもたらし、電磁妨害波による他の機器への
影響が抑えられ、電子機器等の動作環境の向上に大きく
貢献する。As described above, according to the present invention, no countermeasures have been taken against unbalanced electromagnetic interference.
ADVANTAGE OF THE INVENTION According to this invention, the effect with respect to an electromagnetic interference wave is also provided with the protection against lightning, the influence on other apparatuses by an electromagnetic interference wave is suppressed, and it contributes to the improvement of the operating environment of an electronic device etc. greatly.
【図１】本発明による不平衡型雷保護回路。FIG. 1 shows an unbalanced lightning protection circuit according to the present invention.
【図２】従来の不平衡型雷保護回路。FIG. 2 shows a conventional unbalanced lightning protection circuit.
ＡＲＲ１・・・アレスタ、 Ｖ１、Ｖ２・・・バリス
タ、Ｒ１、Ｒ２・・・抵抗、 １・・・Ｂ／Ｕ ＣＯ
ＮＶ、２・・・Ｕ／Ｖ ＣＯＮＶARR1: Arrester, V1, V2: Varistor, R1, R2: Resistance, 1: B / U CO
NV, 2 ... U / V CONV
Claims (1)
路において、前記信号伝送路の一方に直列に挿入する抵
抗素子と、該抵抗素子の夫々の端子と信号伝送路の他方
との間に接続するアレスタ回路及びバリスタ回路と、前
記信号伝送路の他方とフレームアース間を接続する第二
のバリスタ回路とを備え、前記アレスタ回路のアース端
子をフレームアースに接続するよう構成したことを特徴
とする不平衡型雷保護回路。In a lightning protection circuit inserted into an unbalanced signal transmission line, a resistance element inserted in series with one of the signal transmission lines, a terminal of each of the resistance elements and the other of the signal transmission line are connected. An arrestor circuit and a varistor circuit connected therebetween, and a second varistor circuit connecting the other of the signal transmission lines and a frame ground, wherein the ground terminal of the arrester circuit is connected to a frame ground. Unbalanced lightning protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31284497A JPH11136855A (en) | 1997-10-29 | 1997-10-29 | Unbalanced lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31284497A JPH11136855A (en) | 1997-10-29 | 1997-10-29 | Unbalanced lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11136855A true JPH11136855A (en) | 1999-05-21 |
Family
ID=18034117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31284497A Pending JPH11136855A (en) | 1997-10-29 | 1997-10-29 | Unbalanced lightning protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11136855A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005093923A1 (en) * | 2004-03-26 | 2005-10-06 | Otowa Electric Co. Ltd. | Surge absorber and surge absorbing circuit |
| JP2013190208A (en) * | 2012-03-12 | 2013-09-26 | Panasonic Corp | Power measuring apparatus |
-
1997
- 1997-10-29 JP JP31284497A patent/JPH11136855A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005093923A1 (en) * | 2004-03-26 | 2005-10-06 | Otowa Electric Co. Ltd. | Surge absorber and surge absorbing circuit |
| JP2013190208A (en) * | 2012-03-12 | 2013-09-26 | Panasonic Corp | Power measuring apparatus |
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