JPS5933938A - Hybrid transformer driving system - Google Patents

Hybrid transformer driving system

Info

Publication number
JPS5933938A
JPS5933938A JP14285882A JP14285882A JPS5933938A JP S5933938 A JPS5933938 A JP S5933938A JP 14285882 A JP14285882 A JP 14285882A JP 14285882 A JP14285882 A JP 14285882A JP S5933938 A JPS5933938 A JP S5933938A
Authority
JP
Japan
Prior art keywords
current
wire side
wire
line
hybrid transformer
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
Application number
JP14285882A
Other languages
Japanese (ja)
Inventor
Shinichi Ito
真一 伊藤
Mitsutoshi Ayano
綾野 光俊
Kiyoshi Shibuya
清 渋谷
Kenji Takato
健司 高遠
Yoshito Takeda
竹田 義人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP14285882A priority Critical patent/JPS5933938A/en
Publication of JPS5933938A publication Critical patent/JPS5933938A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • H04B1/54Circuits using the same frequency for two directions of communication
    • H04B1/58Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/581Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using a transformer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To attain the normal communication at impedance change when a feeding circuit is connected to a two-wire side, by converting a signal voltage into a current, and performing the driving of signal from the input of 4-wire side of the hybrid transformer to the 2-wire side output by the converted current. CONSTITUTION:A change in a signal voltage inputted to a base of a transistor (TR)Q is a current change and this current is extracted as a current source from the collector. An output signal voltage of an operational amplifier OPA2 is converted into a current to drive the hybrid transformer T by the current. Even when a value of a resistor R12 is increased, the output current of a voltage/ current converting circuit C is applied sufficiently to the transformer T so as to drive normally the transformer T from the 4-wire side 4Wi, and an input signal of the 4Wi is transmitted to the 2-wire side 2W via the transformer T. Since the output impedance of the circuit C is high, the value of resistors R11, R12 is increased and the impedance viewed from the 2-wire side 2W is increased.

Description

【発明の詳細な説明】 発明の技術的分野 本発明はハイブリッド・トランス駆動方式、さらに詳し
く言えば、2線側からみたハイブリッド・トランスのイ
ンピーダンスを高くし得るハイブリッド・・トランス駆
動方式に関する。
TECHNICAL FIELD OF THE INVENTION The present invention relates to a hybrid transformer drive system, and more particularly, to a hybrid transformer drive system that can increase the impedance of the hybrid transformer as viewed from the two-wire side.

技術の背景 近年、ディジタル電話交換機が導入された。ディジタル
電話交換機はPCMによる4線式交換を行ない、かつ中
継交換のみならず、加入者回線を収容して加入者交換を
行なう。このため、各加入者回線(2線式)に2線4線
変換回路を接続し、2線4線変換金行なった後、コード
変換器(CODF、C)を通してディジタルネットワー
クに収容することとなる。この種の交換機においても、
従来の加入者交換機で行なわれているのと同様に扱者電
話機を接続(割シ込み)するようなことがおこる。
Background of the Technology In recent years, digital telephone exchanges have been introduced. A digital telephone exchange performs four-wire switching using PCM, and not only performs relay switching but also accommodates subscriber lines and performs subscriber switching. For this reason, a 2-wire 4-wire conversion circuit is connected to each subscriber line (2-wire type), and after 2-wire 4-wire conversion is performed, it is accommodated in the digital network through a code converter (CODF, C). . Even in this type of exchange,
The operator's telephone is connected (interrupted) in the same way as is done in conventional subscriber exchanges.

2線4線変換回路の2線側に2線式回線のみを接続する
ときは、通常は2線側から見たハイブリッドトランスの
インピーダンスは回線のインピーダンスと同様の600
0−1200Ω程度に構成されるが、上記のように2線
式回線に扱者電話機の割込みを行なう場合等は2線側か
ら見たインピーダンスを高インピーダンスに見せる必要
がある。
When only a 2-wire line is connected to the 2-wire side of a 2-wire/4-wire conversion circuit, the impedance of the hybrid transformer viewed from the 2-wire side is usually 600, which is the same as the line impedance.
The impedance is about 0-1200Ω, but when interrupting the two-wire line by the operator's telephone as mentioned above, the impedance seen from the two-wire side needs to appear high impedance.

従来技術と問題点 2線4線変換には、・・イブリッド・トランスを用いる
ことが多い。第1図に従来一般的に使用されているハイ
ブリッド・トランスを用いた2線4線変換回路の1例の
接続構成を示す。
Prior Art and Problems For 2-wire and 4-wire conversion, hybrid transformers are often used. FIG. 1 shows an example of a connection configuration of a conventional two-wire four-wire conversion circuit using a hybrid transformer.

図において、Tは3つの巻線をもつハイブリッド・トラ
ンス、BNは平衡ネットワーク、Rs * R2は回線
インピーダンス(通常600Ω)と一致した抵抗値をも
つ抵抗、0PAl、 0PA2は演算増幅器であり、2
Wは2線側の回線を、4 Wo 、 4 Wiはそれぞ
れ4線側の出力回線および入力回線を示す。図から容易
に理解されるように、2線側回線2Wは平衡回線である
が、4線側回線4 Wo 、 4Wiは不平衡回線であ
る。平衡ネットワークBNは、2線側回線2Wのインピ
ーダンスと平衡させるネットワークである。
In the figure, T is a hybrid transformer with three windings, BN is a balanced network, Rs * R2 is a resistor whose resistance matches the line impedance (usually 600 Ω), 0PA1, 0PA2 are operational amplifiers, 2
W indicates a line on the 2-line side, and 4 Wo and 4 Wi indicate an output line and an input line on the 4-line side, respectively. As can be easily understood from the figure, the two-line side line 2W is a balanced line, but the four-line side lines 4Wo and 4Wi are unbalanced lines. The balanced network BN is a network that balances the impedance of the two-line side line 2W.

第1図において、よく知られているように2線側回線2
Wよシの入力信号は、ハイブリッド・トランスTを経て
抵抗R1に達し、抵抗R1の両端における電圧となって
現れ、これを演算増幅器OPA+にて増幅し、4線側の
出力回線4W、に送シ出し、また4線側の入力回線4W
iからの入力信号は演算増幅器0PA2で増幅され、ハ
イブリッド・トランスTを経て2線側回線2Wに出力し
、しかも4線側の出力回線4Woには出力しない。 (
あるいは多大の減衰を受ける。)このようにして、よく
知られているように2線4線変換が行なわれる。
In Figure 1, as is well known, the 2nd line side line 2
The input signal from W passes through the hybrid transformer T, reaches the resistor R1, appears as a voltage across the resistor R1, is amplified by the operational amplifier OPA+, and is sent to the output line 4W on the 4-wire side. output, and the input line 4W on the 4-wire side
The input signal from i is amplified by the operational amplifier 0PA2, and is output to the 2-line side line 2W via the hybrid transformer T, but not to the 4-line side output line 4Wo. (
Or receive a large amount of attenuation. ) In this way, two-line to four-line conversion is performed as is well known.

既に説明したように、このハイブリッド・トランスTの
2線側2Wから見たインピーダンス全島< (10KΩ
〜100に17程度)見せる必要が生じた場合、抵抗R
H+ R2の値を高くすれば、高インピーダンスとなる
が、演算増幅器OPA 2の出力部に接続された抵抗R
2を旨抵抗にすると、該演算増幅器0PA2の出力電圧
を高める必要が生ずるが、実際上必要な高い電圧の出力
を得ることは困難であるので、4線側の入力量114W
iからハイブリッド・トランスTを駆動することが不可
能となる。
As already explained, the impedance of this hybrid transformer T as seen from the 2-wire side 2W is < (10KΩ
~100 to 17) If it is necessary to show the resistance R
The higher the value of H+ R2, the higher the impedance, but the resistor R connected to the output of the operational amplifier OPA 2
If 2 is made into a resistor, it becomes necessary to increase the output voltage of the operational amplifier 0PA2, but it is difficult to obtain the required high voltage output in practice, so the input amount on the 4-wire side is 114W.
It becomes impossible to drive the hybrid transformer T from i.

このように、従来のハイブリッド・トランス駆動方式に
よシ、2線側から見比インピーダンスを高く見えるよう
に保持しつつ、4線側の入力回線からハイブリッド・ト
ランスを正常に駆動することは、上記のような困難があ
り、その実現は容易ではなかった。
In this way, in contrast to the conventional hybrid transformer drive method, it is possible to normally drive the hybrid transformer from the input line on the 4-wire side while maintaining the relative impedance seen from the 2-wire side to be high. It was not easy to realize this goal, as there were many difficulties.

発明の目的 本発明は、従来のハイブリッド・トランス駆動方式の上
記の困難を排除して、2紳側から見たインピーダンスを
高く見えるよう保持しつつ4線側の入力回線からハイブ
リッド・トランスを正常に駆動することが可能なハイブ
リッド・トランス駆動方式を提供することを目的とする
Purpose of the Invention The present invention eliminates the above-mentioned difficulties of the conventional hybrid transformer drive system, and allows the hybrid transformer to be operated normally from the input line on the 4-wire side while maintaining the impedance seen from the 2-wire side to appear high. The purpose of the present invention is to provide a hybrid transformer drive system that can drive the vehicle.

発明の実施例 第2図は本発明の一実施例の接続構成図である。Examples of the invention FIG. 2 is a connection configuration diagram of an embodiment of the present invention.

第2図における記号はそれぞれ第1図に示したど同一の
ものを示し、なお、R11、Ruは高抵抗、Cは電圧・
電流変換回路、Qはトランジスタ、CHはチョーク、R
8は抵抗である。
The symbols in FIG. 2 are the same as those shown in FIG. 1, and R11 and Ru are high resistances, and C is a voltage
Current conversion circuit, Q is a transistor, CH is a choke, R
8 is resistance.

第2図においても、第1図と同様に、2紳側回線2WJ
l)入力する信号は、ハイブリッド・トランスT’(C
−経て抵抗R11に達し、抵抗1111の両端における
電圧となって現れるので、−これを演算増幅器OPA、
で増幅し、4線側の出力回線4Woに送り出し、また4
線側の入力回線4Wiからの入力信号は、まづ演算増幅
器0PA2で電圧増幅され、増幅された信号電圧は電圧
電流変換回路Cに入力し、この入力信号電圧は電流に変
換され、ハイブリッド・トランスTi電流駆動する。こ
こに電圧電流変換回路としては、種々の回路を使用し得
るが、第2図にはその一例を示す。すなわち、演算増幅
器0PA2から出力する信号電圧は、電圧電流変換回路
CのトランジスタQのベースに与えられるが、トランジ
スタの特性上、エミッタとベースとの間の電圧は一定に
保持されるので、上記のトランジスタQのベースに入力
する信号電圧の変化はトランジスタQのエミッタから抵
抗■ζBを経て地気に流れる電流の変化となり、この電
流はトランジスタの性質によりコレクタよシミ流源とし
て取出すことができる。なお、CHlよチョークであっ
て、これにより交流を阻止する。従って演算増幅器OP
A 2の出力する信号電圧は、電流に変換されて、ハイ
ブリッド・トランスTを電流駆動する。ここに抵抗RI
2の値を高く選定しても、電圧・電流変換回路C(q出
力電流をハイブリッド・トランスTに充分供給すること
ができるのでハイブリッド・l・ランスTを4線側の入
力回線4Wijニジ正常に駆動することができ、該入力
回線4Wiがら入力する信号をハイブリッド・トランス
Tvi−経て2線側2wに送出することかできる。
In Figure 2, as in Figure 1, the 2nd line 2WJ
l) The input signal is a hybrid transformer T' (C
- through the resistor R11 and appears as a voltage across the resistor 1111, - this is connected to the operational amplifier OPA,
amplify it, send it to the output line 4Wo on the 4-wire side, and
The input signal from the input line 4Wi on the line side is first voltage amplified by the operational amplifier 0PA2, and the amplified signal voltage is input to the voltage-current conversion circuit C, where this input signal voltage is converted to a current and the hybrid transformer Ti current driven. Various circuits may be used as the voltage-current conversion circuit, and FIG. 2 shows one example thereof. That is, the signal voltage output from the operational amplifier 0PA2 is applied to the base of the transistor Q of the voltage-current conversion circuit C, but due to the characteristics of the transistor, the voltage between the emitter and the base is held constant, so the above A change in the signal voltage input to the base of the transistor Q results in a change in the current flowing from the emitter of the transistor Q to the ground through the resistor ζB, and this current can be taken out as a stain current source from the collector depending on the characteristics of the transistor. Note that CHl is a choke, which blocks alternating current. Therefore, operational amplifier OP
The signal voltage output by A2 is converted into a current and drives the hybrid transformer T with current. Here is the resistance RI
Even if the value of 2 is selected high, the voltage/current conversion circuit C (q output current can be sufficiently supplied to the hybrid transformer T, so the hybrid lance T can be connected normally to the input line 4Wij on the 4-wire side. The signal input from the input line 4Wi can be sent to the second line side 2w via the hybrid transformer Tvi-.

このとき、電圧・電流変換回路Cの出力インピーダンス
は極めて高いので抵抗R11r R12の値を高□く選
定することによシ、ハイブリッド・トランスT C+ 
2 m 側回線2Wから見たインピーダンスヲ高くする
ことができる。抵抗R11* RI2の値を等しくなる
ように選定することにより、4線側の大刀回線4Wiか
ら入力する信号を4線側の出方回線4WQに出力させな
いようにできることはいうまでもない。
At this time, the output impedance of the voltage/current conversion circuit C is extremely high, so by selecting a high value for the resistors R11r and R12, the hybrid transformer T C+
The impedance seen from the 2m side line 2W can be increased. It goes without saying that by selecting the values of the resistors R11*RI2 to be equal, it is possible to prevent the signal input from the long line 4Wi on the 4-line side from being output to the output line 4WQ on the 4-line side.

以上本発明の一実施例につ込て説明したが、本発明は上
記の実施例に限定されるものではなく、その技術的範囲
内において種々の変形が可能である。
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope thereof.

第2図における電圧・電流変換回路Cは、−例を示した
に過ぎず、他の構成のものを使用することができる。
The voltage/current conversion circuit C in FIG. 2 is merely an example, and other configurations may be used.

発明の詳細 な説明したように、本発明によれば、ハイブリッド・ト
ランスを使用する2線4線変換回路において2線側に給
電回路を接続し、あるいは、さらに扱者電話機を接続(
割込み)する等によシ回線のインピーダンスが変化する
ようなことがあっても正常な通話が確保される効果があ
る。しかも、簡単な手段で実施することが可能な効果を
も有する。
As described in detail, according to the present invention, in a 2-wire 4-wire conversion circuit using a hybrid transformer, a power supply circuit is connected to the 2-wire side, or an operator's telephone is further connected (
This has the effect of ensuring normal communication even if the impedance of the line changes due to interruptions, etc. Moreover, it has an effect that can be implemented with simple means.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来一般的に使用されているハイブリッド・ト
ランスを用いた2線4線変換回路の接続構成図、第2図
は本発明の一実施例の接続構成図である。 T・・・3巻線をもつハイブリッド・トランス、BN・
・・平衡ネットワーク、R1、R2、R8、R11、R
12・・・抵抗、0PAl、 0PA2・・・演算増幅
器、C・・・電圧電流変換回路、Q・・・トランジスタ
、CH・・・チョーク。 特許出願人 富士通株式会社
FIG. 1 is a connection configuration diagram of a conventional two-wire four-wire conversion circuit using a hybrid transformer, and FIG. 2 is a connection configuration diagram of an embodiment of the present invention. T...Hybrid transformer with 3 windings, BN...
...Equilibrium network, R1, R2, R8, R11, R
12...Resistor, 0PA1, 0PA2...Operation amplifier, C...Voltage-current conversion circuit, Q...Transistor, CH...Choke. Patent applicant Fujitsu Limited

Claims (1)

【特許請求の範囲】[Claims] ハイブリッド・トランスを使用する2線4線変換回路に
おいて、4線側の信号入力部に電圧・電流変換回路を設
けて該信号入力部に入力する信号電圧を電流に変換し、
ハイブリッド・トランスの4線側入力から2線側出力へ
の信号駆動を、上記の変換された電流によシ行なうこと
を特徴とするハイブリッド・トランス駆動方式。
In a 2-wire 4-wire conversion circuit using a hybrid transformer, a voltage/current conversion circuit is provided at the signal input section on the 4-wire side to convert the signal voltage input to the signal input section into a current,
A hybrid transformer drive system characterized in that a signal driven from a four-wire side input to a two-wire side output of the hybrid transformer is performed using the converted current.
JP14285882A 1982-08-18 1982-08-18 Hybrid transformer driving system Pending JPS5933938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14285882A JPS5933938A (en) 1982-08-18 1982-08-18 Hybrid transformer driving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14285882A JPS5933938A (en) 1982-08-18 1982-08-18 Hybrid transformer driving system

Publications (1)

Publication Number Publication Date
JPS5933938A true JPS5933938A (en) 1984-02-24

Family

ID=15325248

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14285882A Pending JPS5933938A (en) 1982-08-18 1982-08-18 Hybrid transformer driving system

Country Status (1)

Country Link
JP (1) JPS5933938A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5120653A (en) * 1974-08-14 1976-02-19 Hitachi Ltd DENSHIKA HAIBURITSU DOKAIRO

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5120653A (en) * 1974-08-14 1976-02-19 Hitachi Ltd DENSHIKA HAIBURITSU DOKAIRO

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