JPS5826215B2 - Chiyukeiki Cairo - Google Patents
Chiyukeiki CairoInfo
- Publication number
- JPS5826215B2 JPS5826215B2 JP50058444A JP5844475A JPS5826215B2 JP S5826215 B2 JPS5826215 B2 JP S5826215B2 JP 50058444 A JP50058444 A JP 50058444A JP 5844475 A JP5844475 A JP 5844475A JP S5826215 B2 JPS5826215 B2 JP S5826215B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- repeater
- circuit
- power supply
- line
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/44—Arrangements for feeding power to a repeater along the transmission line
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【発明の詳細な説明】
本発明は、基底帯域通信方式、特に２０Ｈｚに至る超低
周波まで使用される広帯域画像伝送方式において、遠方
給電によって動作する中継器回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a repeater circuit that operates by remote power supply in a baseband communication system, particularly in a wideband image transmission system that is used up to extremely low frequencies up to 20 Hz.
通常この種の中継器では遠方からの定電流重信給電方式
が採用される。Normally, this type of repeater uses a constant current multiplex power supply system from a distance.
すなわち中継器回路を動作させるに必要な電流は端局よ
り信号と重畳されて信号と同一の線路を用いて定電流給
電される。That is, the current necessary to operate the repeater circuit is superimposed on the signal from the terminal station and is supplied with a constant current using the same line as the signal.
この時給電電流変動による中継器両端間の電圧変動をさ
ける為、中継器両端間インピーダンスを充分小さくする
事が要求される。In order to avoid voltage fluctuations between both ends of the repeater due to fluctuations in the power supply current at this time, it is required to make the impedance between both ends of the repeater sufficiently small.
第１図は従来の定電流重信給電方式の中継器の一例を示
す回路図で、１，２は伝送線路、３は中継器、４は中継
器内増巾器、５は出力増巾器、６は信号と給電電流を分
離する信号−給電電流分離器、７は線路から給電電流を
とり入れて中継器内増巾器にバイアス電流を供給する電
源回路、８は給電電流と出力増巾器５及び電源回路７に
流れる電流の差をバイパスする回路、９は出力増巾器５
のバイアス電流を決定する素子、１０は電源線、１１は
回路アース線である。Fig. 1 is a circuit diagram showing an example of a conventional constant current duplex feed system repeater, where 1 and 2 are transmission lines, 3 is a repeater, 4 is an amplifier in the repeater, 5 is an output amplifier, 6 is a signal-feed current separator that separates the signal and the feed current; 7 is a power supply circuit that takes in the feed current from the line and supplies a bias current to the amplifier in the repeater; 8 is the feed current and output amplifier 5 and a circuit that bypasses the difference in current flowing in the power supply circuit 7, 9 is an output amplifier 5
10 is a power supply line, and 11 is a circuit ground line.
伝送線路１から送られた信号は中継器３に導入され、中
継器内増巾器４および出力増巾器５によって増巾され線
路２に送出される。A signal sent from the transmission line 1 is introduced into the repeater 3, amplified by an in-repeater amplifier 4 and an output amplifier 5, and sent to the line 2.
一方線路２から送られた給電電流は出力増巾器５および
素子９を経て回路アース線１１に抜ける第１の経路と、
電源回路７、電源線１０および中継器内増巾器４を経て
回路アース１１に抜ける第２の経路と、線路２から直接
バイパス回路８を経て回路アース１１に抜ける第３の経
路とに分流される。On the other hand, the feed current sent from the line 2 passes through the output amplifier 5 and the element 9 and exits to the circuit ground wire 11 through a first path;
The current is divided into a second path that goes through the power circuit 7, the power line 10, and the repeater amplifier 4 to the circuit ground 11, and a third path that goes directly from the line 2 to the circuit ground 11 via the bypass circuit 8. Ru.
回路アース１１に合流した電流は信号−給電電流分離器
６を経て線路１に送出される。The current that has joined the circuit ground 11 is sent to the line 1 via the signal-feed current separator 6.
出力増巾器５をトランジスタで構成する場合、低い電源
電圧で大きな振巾が得られるエミッタ接地トランジスタ
が用いられる事が多いが、この場合トランジスタのコレ
クタ電流はコレクターエミッタ間電圧にほとんど依存し
ない為、第１の経路に流れる電流は第１の経路の２端子
間の電圧にほとんど依存せず一定となる。When the output amplifier 5 is composed of transistors, a common emitter transistor is often used because it can obtain a large amplitude with a low power supply voltage, but in this case, the collector current of the transistor hardly depends on the collector-emitter voltage. The current flowing through the first path is almost constant and does not depend on the voltage between the two terminals of the first path.
すなわち第１の経路の２端子間インピーダンスは非常に
高くなる。In other words, the impedance between the two terminals of the first path becomes extremely high.
第２の経路に流れる電流は電源回路７の出力電源電圧に
依存するが、安定度のよい電源回路を用いた場合はその
出力電源電圧が中継器両端間電圧に依存しない為、第２
の経路に流れる電流も中継器両端間電圧に依存せず、第
２の経路の２端子間インピーダンスは非常に高くなる。The current flowing in the second path depends on the output power supply voltage of the power supply circuit 7, but if a highly stable power supply circuit is used, the output power supply voltage does not depend on the voltage across the repeater, so the second path
The current flowing through the path also does not depend on the voltage across the repeater, and the impedance between the two terminals of the second path becomes very high.
第３の経路のインピーダンスを低くする事は出力増巾器
の負荷が重くなる為、実現困難である。It is difficult to lower the impedance of the third path because it increases the load on the output amplifier.
以上３つの経路はいずれもインピーダンスを低くする事
は困難な為、中継器両端間インピーダンスが大きくなり
、給電電流変動により中継器両端間電圧が大きく変動し
、中継器が動作不能となる事もあった。Since it is difficult to lower the impedance of any of the above three routes, the impedance between both ends of the repeater increases, and the voltage between both ends of the repeater fluctuates greatly due to fluctuations in the supply current, which may cause the repeater to become inoperable. Ta.
第３の経路は給電電流の変動や第１の経路と第２の経路
に流れる電流の初期扁差や温度変動を吸収する為の経路
であり、これらの変動要因が大きい時はあらかじめ多大
の電流を第３の経路に流しておかねばならない。The third path is a path to absorb fluctuations in the power supply current, the initial difference in current between the first path and the second path, and temperature fluctuations, and when these fluctuation factors are large, a large amount of current is absorbed in advance. must be allowed to flow through the third route.
この第３の経路に流れる電流は何ら中継器の特性向上に
役だたない為、前記変動要因が大きい時は給電電流が有
効に用いられず、中継器を正常に動作させる為に必要な
電流を第１の経路と第２の経路に確保する為には多大な
給電電流を必要とする。The current flowing through this third path does not help improve the characteristics of the repeater, so when the above fluctuation factors are large, the power supply current is not used effectively, and the current required to operate the repeater normally A large amount of power supply current is required to ensure that the power is supplied to the first path and the second path.
本発明の目的は給電電流の変動や中継器内の消費電流の
変動によって生じる中継器両端間直流電圧の変動を検出
して出力増巾器のバイアス電流を制御する電流源を設け
、これにより給電電流の変動や第１の経路や第２の経路
に流れる電流の初期扁差や温度変動を吸収し、第３の経
路をなくして給電電流の有効活用を図ることのできる中
継器回路を提供することにある。The purpose of the present invention is to provide a current source that controls the bias current of the output amplifier by detecting the fluctuation of the DC voltage across the repeater caused by the fluctuation of the power supply current or the fluctuation of the consumption current in the repeater. To provide a repeater circuit capable of absorbing current fluctuations, initial differences in current flowing through a first path and a second path, and temperature fluctuations, eliminating a third path, and effectively utilizing power supply current. There is a particular thing.
以下本発明を図面を参照して説明する。The present invention will be explained below with reference to the drawings.
第２図は本発明の一実施例を示す回路図であり、１から
１１までは第１図と全く同様である。FIG. 2 is a circuit diagram showing one embodiment of the present invention, and 1 to 11 are completely the same as in FIG. 1.
但し第２図では回路８はない。However, the circuit 8 is not shown in FIG.
１２は線路２と回路アース１１間の平均直流電圧を検出
する回路、１３は基準電圧源、１４は線路２の平均直流
電圧と基準電圧の差を比較増巾する増巾器、１５は出力
増巾器５のバイアス電流を制御するトランジスタである
。12 is a circuit that detects the average DC voltage between the line 2 and the circuit ground 11; 13 is a reference voltage source; 14 is an amplifier that compares and amplifies the difference between the average DC voltage of the line 2 and the reference voltage; 15 is an output increaser. This is a transistor that controls the bias current of the width filter 5.
信号電流の流れは第１図と全く同様である。The flow of signal current is exactly the same as in FIG.
線路２から送られた給電電流は、主として出力増巾器５
から素子９やトランジスタ１５を経て回路アース線１１
に流れる第１の経路と、電源回路７、電源線１０および
中継器内増巾器４を経て回路アース１１に流れる第２の
経路に分流される。The feed current sent from the line 2 is mainly supplied to the output amplifier 5.
From there, the circuit ground wire 11 passes through the element 9 and the transistor 15.
and a second path that flows to circuit ground 11 via power supply circuit 7, power line 10, and repeater amplifier 4.
回路１２は比較増巾器１４に線路の平均直流電圧を与え
る回路であり、その線路２から回路アース線１１間のイ
ンピーダンスを充分高くする事により、回路１２を通っ
て回路アース線に流れる電流を第１の経路や第２の経路
に流れる電流に較べ非常に小さくすることができる。The circuit 12 is a circuit that provides the average DC voltage of the line to the comparison amplifier 14, and by making the impedance between the line 2 and the circuit ground wire 11 sufficiently high, the current flowing through the circuit 12 to the circuit ground wire can be reduced. The current can be made much smaller than the current flowing through the first path and the second path.
回路アース１１に流れた電流は信号−給電電流分離回路
を経て再び線路１に送出される。The current flowing through the circuit ground 11 is sent out to the line 1 again via the signal-supply current separation circuit.
線路２から送られた給電電流が変動したり、第１の経路
や第２の経路を流れる中継器の消費電流が変動すると。When the power supply current sent from the line 2 fluctuates, or when the current consumption of the repeater flowing through the first path or the second path fluctuates.
線路２と線路１間の平均直流電圧が変動する。The average DC voltage between line 2 and line 1 fluctuates.
比較増巾器１４はこの直流電圧変動を回路１２によって
検出し、これを基準電圧１３と比較し、バイアス制御用
トランジスタ１５のベース電圧を変化させる。The comparison amplifier 14 detects this DC voltage fluctuation using the circuit 12, compares it with the reference voltage 13, and changes the base voltage of the bias control transistor 15.
トランジスタ１５はベースに加えられた電圧に応じて電
流を出力増巾器１５から回路アース線１１に流す。Transistor 15 allows current to flow from output amplifier 15 to circuit ground line 11 in response to the voltage applied to its base.
これによって線路２から出力増巾器５を経て回路アース
に流れる電流を制御し、給電電流の変動や中継器の消費
電流の変動を吸収する。This controls the current flowing from the line 2 through the output amplifier 5 to the circuit ground, absorbing fluctuations in the power supply current and fluctuations in the current consumption of the repeater.
例えば給電電流が増えたり、出力増巾器５から素子９を
通って流れる電流や電源回路７を通して流れる電流が減
った場合は、線路２と回路アース線１１間の平均直流電
圧が上昇する。For example, if the feed current increases, or if the current flowing from the output amplifier 5 through the element 9 or the current flowing through the power supply circuit 7 decreases, the average DC voltage between the line 2 and the circuit ground line 11 increases.
この時比較増巾器１４の回路１２に接続されている方の
入力端子電圧が基準電圧１３より上昇し、比較増巾器１
４の出力電圧が上昇し、バイアス制御用トランジスタ１
５のコレクタ電流が増加する。At this time, the input terminal voltage of the comparison amplifier 14 connected to the circuit 12 rises above the reference voltage 13, and the comparison amplifier 1
The output voltage of transistor 4 increases, and the bias control transistor 1
5 collector current increases.
この為線路２から回路１１に抜ける電流が増え、給電電
流の増加分や回路の消費電流の減少分を吸収する。Therefore, the current flowing from the line 2 to the circuit 11 increases, absorbing the increase in the feeding current and the decrease in the current consumption of the circuit.
一方、給電電流が減少したり、回路の消費電流が増加し
た場合は、バイアス制御用トランジスタ１５のコレクタ
電流が減少する様に比較増巾器１４が働く。On the other hand, when the power supply current decreases or the current consumption of the circuit increases, the comparison amplifier 14 operates so that the collector current of the bias control transistor 15 decreases.
これにより出力増巾器５から素子９を流れる電流や電源
回路７から中継器内増巾器４に流れる電流が確保される
。This ensures the current flowing from the output amplifier 5 to the element 9 and the current flowing from the power supply circuit 7 to the repeater amplifier 4.
以上説明した如く給電電流の変動や中継器内の消費電流
の変動は全てトランジスタ１５によって吸収され、線路
２と回路アース間の直流電圧変動は非常に少くなる。As explained above, all the fluctuations in the supply current and the fluctuations in the consumption current in the repeater are absorbed by the transistor 15, and the DC voltage fluctuation between the line 2 and the circuit ground becomes extremely small.
すなわち線路２と回路アース線１１間のインピーダンス
は非常に少くなる。That is, the impedance between the line 2 and the circuit ground line 11 becomes extremely small.
又信号−給電電流分離器６の２端子間インピーダンスは
通常充分低い為、本発明の中継器においては線路１と線
路２間のインピーダンスは非常に低くなる。Furthermore, since the impedance between the two terminals of the signal-feed current separator 6 is usually sufficiently low, the impedance between the line 1 and the line 2 is extremely low in the repeater of the present invention.
さらに本発明による中継器では給電電流はバイパスされ
る事なく全て有効に用いられる。Furthermore, in the repeater according to the present invention, all of the feed current is effectively used without being bypassed.
すなわち従来の中継器回路と本発明による中継器回路の
出力増巾器５に流れる電流を比較すると出力増巾器５か
ら素子９を流れる電流や電源回路７から中継器内増巾器
４を流れる電流が初期偏差や温度変動によって最大にな
り、且つ給電電流が最小になった最悪条件では従来回路
では回路８を通ってバイパスされる電流が零となり、本
発明による中継器においてもバイアス制御用トランジス
タ１５に流れる電流が零となる為、出力増巾器５に流れ
る電流は両者等しくなる。That is, when comparing the current flowing through the output amplifier 5 of the conventional repeater circuit and the repeater circuit according to the present invention, the current flowing from the output amplifier 5 to the element 9 and the current flowing from the power supply circuit 7 to the in-repeater amplifier 4 are found. Under the worst case conditions, where the current is at its maximum due to initial deviation and temperature fluctuations and the supply current is at its minimum, in the conventional circuit, the current bypassed through the circuit 8 becomes zero, and in the repeater according to the present invention, the bias control transistor is also used. Since the current flowing through the output amplifier 15 becomes zero, the current flowing through the output amplifier 5 becomes equal to both.
ところが最悪条件以外では従来の中継器は給電電流の一
部は回路８に分流されて、出力増巾器５に流れる電流は
不変であるが、本発明による中継器では出力増巾器５の
電流が増加する。However, under conditions other than the worst, in the conventional repeater, part of the power supply current is shunted to the circuit 8, and the current flowing to the output amplifier 5 remains unchanged, but in the repeater according to the present invention, the current flowing through the output amplifier 5 is increases.
この為本発明による中継器では最悪条件以外常に従来の
中継器より出力増巾器５に流れる電流が多く、出力増巾
器５の最大出力振巾特性や歪率特性が改善される。Therefore, in the repeater according to the present invention, more current flows through the output amplifier 5 than the conventional repeater at all times except under the worst conditions, and the maximum output amplitude characteristics and distortion rate characteristics of the output amplifier 5 are improved.
以上述べた如く、本発明による中継器では、給電電流の
変動や回路の消費電流の変動による中継器間の直流電圧
変動が極めて小さく且つ給電電流が有効に用いられるの
で、少い給電電流で中継器を動作させる画像伝送方式の
中継器に有効である。As described above, in the repeater according to the present invention, DC voltage fluctuations between repeaters due to fluctuations in the power supply current and circuit consumption current are extremely small, and the power supply current is used effectively, so that relays can be performed with a small power supply current. This is effective for image transmission type repeaters that operate devices.
以上の説明では給電電流は線路２から中継器３を通って
線路１に抜ける場合について説明したが、給電電流が線
路１から中継器３を通って線路２に抜ける場合も本発明
を適用できる。In the above description, the case where the feeding current passes from the line 2 to the line 1 through the repeater 3 has been explained, but the present invention can also be applied to the case where the feeding current passes from the line 1 to the line 2 through the repeater 3.
但しこの場合は第２図に示したトランジスタは全て逆極
性となる。However, in this case, all the transistors shown in FIG. 2 have opposite polarities.
第１図は従来の定電流給電方式の中継器を示す回路図、
第２図は本発明による中継器の一実施例を示す回路図で
ある。
図中１，２は伝送線路、３は中継器、４は中継器内増巾
器、５は出力増巾器、６は信号−給電電流分離器、７は
電源回路、８はバイパス回路、９は出力増巾器にバイア
ス電流を流す素子、１０は電源線、１１は回路アース線
、１２は平均直流電圧検出回路、１３は基準電圧源、１
４は比較増巾器、１５はバイアス制御用トランジスタで
ある。Figure 1 is a circuit diagram showing a conventional constant current power supply type repeater.
FIG. 2 is a circuit diagram showing an embodiment of a repeater according to the present invention. In the figure, 1 and 2 are transmission lines, 3 is a repeater, 4 is an amplifier in the repeater, 5 is an output amplifier, 6 is a signal-feed current separator, 7 is a power supply circuit, 8 is a bypass circuit, 9 10 is a power supply line, 11 is a circuit ground line, 12 is an average DC voltage detection circuit, 13 is a reference voltage source, 1 is an element that supplies a bias current to the output amplifier;
4 is a comparison amplifier, and 15 is a bias control transistor.
Claims (1)
において、その給電電流の変動や該中継器内の消費電流
の変動による中継器両端の直流電圧変化を検出してこれ
をほぼ一定値に保つように該中継器の出力増巾器のバイ
アス電流を制御する電流制御回路を具備したことを特徴
とする中継器回路・1. In a repeater circuit that operates with constant current duplex power supply from a current source, DC voltage changes across the repeater due to fluctuations in the power supply current and fluctuations in the current consumption within the repeater are detected and this is maintained at a nearly constant value. A repeater circuit characterized in that it is equipped with a current control circuit that controls the bias current of an output amplifier of the repeater so that the
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50058444A JPS5826215B2 (en) | 1975-05-15 | 1975-05-15 | Chiyukeiki Cairo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50058444A JPS5826215B2 (en) | 1975-05-15 | 1975-05-15 | Chiyukeiki Cairo |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51134013A JPS51134013A (en) | 1976-11-20 |
| JPS5826215B2 true JPS5826215B2 (en) | 1983-06-01 |
Family
ID=13084559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50058444A Expired JPS5826215B2 (en) | 1975-05-15 | 1975-05-15 | Chiyukeiki Cairo |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5826215B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2533383A1 (en) * | 1982-09-17 | 1984-03-23 | Prigent Jean Pierre | Improvement to the repeater for a symmetric pair line. |
| JP4344791B2 (en) | 2002-10-21 | 2009-10-14 | 日本電気株式会社 | Submarine cable system and submarine power supply branching device |
-
1975
- 1975-05-15 JP JP50058444A patent/JPS5826215B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51134013A (en) | 1976-11-20 |
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