JPS62110390A - Dc terminating circuit for trunk line of telephone exchange - Google Patents
Dc terminating circuit for trunk line of telephone exchangeInfo
- Publication number
- JPS62110390A JPS62110390A JP25007485A JP25007485A JPS62110390A JP S62110390 A JPS62110390 A JP S62110390A JP 25007485 A JP25007485 A JP 25007485A JP 25007485 A JP25007485 A JP 25007485A JP S62110390 A JPS62110390 A JP S62110390A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- current
- constant
- photocoupler
- 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
- Interface Circuits In Exchanges (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電話交換装置の局線回路の直流終端回路に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a DC termination circuit for a central office line circuit of a telephone exchange.
従来、この株の局線回路の直流終端回路は第２図に示す
ａｌＫ、局線２１．２２を入力とするダイオード２３〜
２６で構成されるダイオード・ブリッジと、通話１［を
検出するフォト・カプラ３０と％ＮＰＮ）ランジスタ２
８、抵抗２７．２９およびツェナーダイオード３７にて
構成される定電流回路とで構成されていた。Conventionally, the DC termination circuit of this stock's office line circuit has been constructed using diodes 23 to 23 whose inputs are alK and office lines 21 and 22 shown in Fig. 2.
26 and a photocoupler 30 that detects the call 1 [and %NPN) transistor 2
8, a constant current circuit composed of resistors 27, 29, and a Zener diode 37.
第２図に示す従来の直流終端回路は、ダイオード・ブリ
ッジとフォト・カプラのＬＥＤと定ｔｆＬ回路が直列に
なるため５局線終端時の終端電圧が大きくなるという欠
点があった。The conventional DC termination circuit shown in FIG. 2 has the disadvantage that the termination voltage when terminating the 5-station line increases because the diode bridge, the photocoupler LED, and the constant tfL circuit are connected in series.
本発明は、定電流回路内の定電圧源として、通話電流検
出用のフォト・カプラのＬＥＤを使用し、定電流と通話
電流検出端子を持たせた回路を為する。In the present invention, a photocoupler LED for detecting communication current is used as a constant voltage source in a constant current circuit, and the circuit is provided with a constant current and a communication current detection terminal.
次に本発明の実施９１について図面を参照して説明する
。Next, implementation 91 of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例である。FIG. 1 shows an embodiment of the present invention.
図において、局ｉ１１〜２はダイオード３．４゜５．６
で構成されるダイオード・ブリッジの交流人力ＫＦ［さ
れ、ダイオード・ブリッジの正極出力はバイアス抵抗７
とＮＰＮ トランジス、り８のコレクタとトランス１３
とにｒｉｔ秋され、負極出力はフォト・カプラｌ Ｑｃ
ＤＬＥｉ）のカンードと、電流値決定抵抗９とトランス
１３とに接続されている。In the figure, stations i11-2 have diodes of 3.4°5.6
AC human power KF of the diode bridge consisting of the diode bridge positive output is bias resistor 7
and NPN transistor, collector of ri8 and transformer 13
The negative output is connected to a photocoupler Qc.
DLEi), the current value determining resistor 9, and the transformer 13.
バイアス抵抗７はＮＰＮ）う／ラスタ８のベースとフォ
ト・カプラド０のＬＥＤのアノードに接続され、Ｎ 、
Ｐ Ｎ トランジスタ８のエミッタと電流値決定抵抗つ
とが接続される。またフｔ ト・カプラ１０のトランジ
スタ側はエミッタが接地され、コレクタが抵抗１１を介
して正′に源に接続され、このコレクタがｔ光検出信号
端子１６に接続されている。一方、トランス１３の出力
は通話信号端子１４．１５に接続されている。A bias resistor 7 (NPN) is connected to the base of the raster 8 and the anode of the LED of the photocoupler 0;
The emitter of the P N transistor 8 and a current value determining resistor are connected. Further, the emitter of the transistor side of the foot coupler 10 is grounded, the collector is positively connected to the source via the resistor 11, and this collector is connected to the photodetection signal terminal 16. On the other hand, the output of the transformer 13 is connected to a call signal terminal 14.15.
なお、本発明に関係のない局線回路の制御部婢は省略し
である。Note that the control section of the station line circuit, which is not related to the present invention, is omitted.
次に本実施例の動作について説明する。Next, the operation of this embodiment will be explained.
局ｆ１１１，２より直流電圧が加えられている時Ｆｉ。Fi when DC voltage is applied from station f111,2.
ダイオード３〜６により構成されるダイオード・ブリッ
ジにより極性が決定され、ＮＰＮ）ランジスタ８と抵抗
７．９とフォト・カプラＩＯＫて構成される定″’ｉｔ
、ｉ回路に加えられるつＮＰＮ）９ンジスタ８のベース
と負極間の電圧（’ＶＲｇｒ）は、フォト・カプラ１０
のＬＥＤの順方向電圧であり、電流値変化による電圧変
動は小さい。したがってＮＰＮ トランジスタ８のコｌ
／クタＫｌ（１，Ｃ）は、Ｎ Ｐ 、Ｎ トランジスタ
８のｈｐ’ｇが充分大きければ電流値決定抵抗９により
決まり、
となる。ここでＶｌｌｌ、ＦｉＮＰＮ）う／ラスタ８の
ベース・エミッタ間電圧で０．６〜０．７ｖでおるから
、■ｃｄはぼ一定となる。The polarity is determined by a diode bridge composed of diodes 3 to 6, and the polarity is determined by a diode bridge composed of diodes 3 to 6.
, the voltage ('VRgr) between the base and negative electrode of the transistor 8 (NPN) 9 applied to the i circuit is the voltage ('VRgr) applied to the photocoupler 10
This is the forward voltage of the LED, and voltage fluctuations due to changes in current value are small. Therefore, the col of NPN transistor 8
/Kl(1,C) is determined by the current value determining resistor 9 if the hp'g of the N P , N transistor 8 is sufficiently large, and is determined by the current value determining resistor 9. Here, since the base-emitter voltage of the raster 8 is 0.6 to 0.7 V, cd is approximately constant.
したがりて局線１゜２ＩＩＣ加えられる通話信号に対し
てこの定電流回路は充分大きなイ／ビーダ／スを有する
ことＫなるので、局線１．２と通話信号端子１４ 、１
．５の間の損失はなく、通話信号・は伝達され直流終端
回路の条件を満たしている。Therefore, this constant current circuit has a sufficiently large I/V/S for the communication signal applied to the office line 1.2 and the communication signal terminals 14 and 1.
．． 5, there is no loss, and the speech signal is transmitted, satisfying the conditions for a DC termination circuit.
この時の局線１．２の端子電圧は、第２図に示す従来ｆ
ｌＩに比ベフォト・カプラ３０のＬＥＤの順方向電圧分
低くなる。The terminal voltage of the station line 1.2 at this time is the conventional f
The forward voltage of the LED of the photocoupler 30 is lower than lI.
一方、フォト・カプラ１０のＬ Ｅ Ｄ 、には、を泥
が流れているため、トランジスタはＯＮされ１通話電流
検出端子１６には地気が出力される。On the other hand, since dirt is flowing through L E D of the photo coupler 10, the transistor is turned on and earth air is output to the first communication current detection terminal 16.
次に局４１１．．２に直Ｒ１！圧が加わわらなくなった
場合、フォト・カプラ１０のＬＥＤＫは、電流が蒐れな
くなり、トランジスタｔｉＯＦＦＬ、、Ａ話電流検出端
子１６には、正電源が出力される。Next station 411. ．． Direct R1 to 2! When the voltage is no longer applied, the LEDK of the photocoupler 10 no longer receives current, and a positive power source is output to the transistor tiOFFL, the A current detection terminal 16.
以上説明した様に本発明は、定電流回路の定電圧Ｋ Ｉ
ｃ ７ ｔ ）・カブ２のＬ Ｅ 、Ｄを使用すること
Ｋより、斜動電圧を小さくでき％また部品点数、コスト
を低減する効果がある。As explained above, the present invention provides constant voltage K I of a constant current circuit.
c 7 t )・Using L E and D of Cub 2 has the effect of reducing the slanting voltage by % and reducing the number of parts and cost.
第１図は本発明の実施例を示す回路図、第２図は従来例
を示す回路図である。
１．２，２１．２２・・・・・・局線、３ 、４ 、５
、６．２３ 。
２４．２５．．２６・・・・・・ダイオード、７，９．
ｌ’ｌ 、２７゜２９．３１ ・・・・・・抵抗、８
，２８・・・・・・ＮＰＮ）７ンジスタ、１．０ 、３
０・・・・・・フォト・カプラ、１２．３２・・・・・
・コンテ／す％ １３ 、、３３・・・・・・トランス
、１４゜１．５ 、３４ 、３５・・・・・・通話信号
端子、、１６．３６・・・・・・通話電流検出端子、３
７・・・・・・ツェナー・ダイオード。
、２．。
璽 ゛。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional example. 1.2, 21.22... Central line, 3 , 4 , 5
, 6.23. 24.25. ．． 26...Diode, 7,9.
l'l, 27°29.31...Resistance, 8
, 28...NPN) 7 registers, 1.0, 3
0...Photo coupler, 12.32...
・Conte/Su% 13 , 33...Transformer, 14゜1.5, 34, 35...Talking signal terminal, 16.36...Talking current detection terminal ,3
7...Zener diode.
, 2. . Seal ゛.
Claims (1)
の直流終端回路において、 局線をダイオード・ブリッジの交流入力端子に接続し、
前記ダイオード・ブリッジの正極出力をバイアス抵抗と
、ＮＰＮトランジスタのコレクタに接続し、前記ダイオ
ード・ブリッジの負極出力をフォト・カプラのＬＥＤの
カソードと電流値決定抵抗に接続し、前記ＮＰＮトラン
ジスタと前記電流値決定抵抗の他端とを接続し、前記Ｎ
ＰＮトランジスタのベースと前記バイアス抵抗の他端と
前記フォト・カプラのＬＥＤのアノードとを接続し、前
記フォト・カプラのトランジスタのエミッタを接地、コ
レクタを抵抗を介して正極電源に接続して前記フォト・
カプラのコレクタより通話電流検出信号を与えることを
特徴とする直流終端回路。[Claims] In a direct current termination circuit for a central office line circuit that is housed in a telephone exchange and is capable of detecting communication current, the central office line is connected to an AC input terminal of a diode bridge,
The positive output of the diode bridge is connected to a bias resistor and the collector of the NPN transistor, and the negative output of the diode bridge is connected to the cathode of the LED of the photocoupler and a current value determining resistor, and the output of the diode bridge is connected to a bias resistor and the collector of the NPN transistor. The other end of the value determining resistor is connected to the N
The base of the PN transistor, the other end of the bias resistor, and the anode of the LED of the photocoupler are connected, the emitter of the transistor of the photocoupler is grounded, and the collector is connected to the positive power supply via the resistor.・
A DC termination circuit characterized in that a communication current detection signal is given from a collector of a coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25007485A JPS62110390A (en) | 1985-11-08 | 1985-11-08 | Dc terminating circuit for trunk line of telephone exchange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25007485A JPS62110390A (en) | 1985-11-08 | 1985-11-08 | Dc terminating circuit for trunk line of telephone exchange |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62110390A true JPS62110390A (en) | 1987-05-21 |
Family
ID=17202419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25007485A Pending JPS62110390A (en) | 1985-11-08 | 1985-11-08 | Dc terminating circuit for trunk line of telephone exchange |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62110390A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04113713A (en) * | 1990-09-04 | 1992-04-15 | Toshiba Corp | Optical coupling detector |
| JPH0459665U (en) * | 1990-10-01 | 1992-05-21 | ||
| WO1998049566A1 (en) * | 1997-04-25 | 1998-11-05 | Siemens Aktiengesellschaft | Polarity identification circuit |
-
1985
- 1985-11-08 JP JP25007485A patent/JPS62110390A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04113713A (en) * | 1990-09-04 | 1992-04-15 | Toshiba Corp | Optical coupling detector |
| JPH0459665U (en) * | 1990-10-01 | 1992-05-21 | ||
| WO1998049566A1 (en) * | 1997-04-25 | 1998-11-05 | Siemens Aktiengesellschaft | Polarity identification circuit |
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