JPH06101772B2 - Subscriber line power supply system - Google Patents

Subscriber line power supply system

Info

Publication number
JPH06101772B2
JPH06101772B2 JP20624784A JP20624784A JPH06101772B2 JP H06101772 B2 JPH06101772 B2 JP H06101772B2 JP 20624784 A JP20624784 A JP 20624784A JP 20624784 A JP20624784 A JP 20624784A JP H06101772 B2 JPH06101772 B2 JP H06101772B2
Authority
JP
Japan
Prior art keywords
power supply
circuit
constant
current
subscriber 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 - Lifetime
Application number
JP20624784A
Other languages
Japanese (ja)
Other versions
JPS6184955A (en
Inventor
義人 櫻井
秀雄 龍野
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.)
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
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 Hitachi Ltd, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP20624784A priority Critical patent/JPH06101772B2/en
Publication of JPS6184955A publication Critical patent/JPS6184955A/en
Publication of JPH06101772B2 publication Critical patent/JPH06101772B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H04M19/005—Feeding arrangements without the use of line transformers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、時分割形電子交換機の加入者回路の給電方式
に係るもので、特に交換機のシステムダウン時の一斉ト
ーキー送出に好適な給電方式に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system for a subscriber circuit of a time division type electronic exchange, and more particularly to a power supply system suitable for simultaneous talkie transmission when the system of the exchange is down. It is a thing.

〔発明の背景〕 第２図にて、従来の一斉トーキー送出時の回路例を説明
する。図において、負荷抵抗１は、実際には加入者線路
と電話機である。２の部分が給電回路で、電子回路によ
って等価的に440Ω（抵抗３）、48V（電源４）で給電す
る。通常の通話時の給電はこれによって行われる。一
方、５は加入者線引込み試験用のスイッチで、引込み後
は複数回路のマルチ接続となる。システムダウン時に
は、スイッチ５を切換えて、ツェナーダイオード６、抵
抗12、48V電源８で作られる数Ｖの電圧で給電し、トー
キー音を送出する。抵抗７は実際には、トーキー送出用
のコイルである。システムダウン時には、呼率が上る可
能性があり、多数の加入者へ同時に48V給電を行ってト
ーキーを送出すると、電力消費が非常に多くなる。電流
容量や熱設計の点で問題があるため、このような、数Ｖ
のツェナー電圧を使う方法がとられている。しかし、加
入者回路及び加入者端末両者の電子回路化が進む中で、
この従来法では、電子回路化から取残されている、とい
う問題があった。[Background of the Invention] An example of a circuit for transmitting a conventional simultaneous talkie will be described with reference to FIG. In the figure, the load resistor 1 is actually a subscriber line and a telephone. The second part is a power supply circuit, which is equivalently powered by an electronic circuit with 440Ω (resistor 3) and 48V (power supply 4). This is the power supply during a normal call. On the other hand, 5 is a switch for a subscriber line lead-in test, and after the lead-in, a multi-connection of a plurality of circuits is made. When the system is down, the switch 5 is switched to supply power with a voltage of several V generated by the Zener diode 6, the resistor 12 and the 48V power supply 8 to send out a talky sound. The resistor 7 is actually a coil for transmitting a talkie. When the system goes down, the call rate may increase, and if 48V power is supplied to many subscribers at the same time and a talkie is sent, the power consumption will be extremely high. Since there are problems in current capacity and thermal design, such a few V
The method of using the Zener voltage of is taken. However, as electronic circuits for both subscriber circuits and subscriber terminals are progressing,
This conventional method has a problem that it is left out of the electronic circuit.

また一斉トーキー送出の例に限らず、給電方式が固定し
ているために、従来の電話以外の新端末の接続に対し、
制限が生じてしまうという欠点もあった。In addition to the example of simultaneous talkie transmission, since the power supply system is fixed, it is possible to connect new terminals other than conventional telephones.
There was also the drawback that restrictions would occur.

〔発明の目的〕[Object of the Invention]

本発明の目的は、上記した従来技術の問題点を解決し、
電子回路化された給電回路に給電方法を切換える機能を
付加し、例えば一斉トーキー送出時には、給電回路その
ものが給電電圧を変化させることのできる加入者線給電
方式を提供することにある。The object of the present invention is to solve the above-mentioned problems of the prior art,
An object of the present invention is to provide a subscriber line power feeding system in which a power feeding circuit is provided with a function of switching a power feeding method, and the power feeding circuit itself can change a power feeding voltage at the time of simultaneous talkie transmission.

〔発明の概要〕[Outline of Invention]

本発明は、従来、直流等価抵抗を一定にして給電する方
式、すなわち定抵抗給電を行っていた給電回路に、出力
電流を一定にする定電流供給機能、もしくは、通話線間
の電圧を一定にする定電圧給電機能を付加し、一斉トー
キー送出時のような、給電方法を変化させる必要がある
場合に、容易にこれを行うようにしたものである。しか
も、本発明は、別回路に引き込む事なく、加入者対応の
給電回路でこれを実現するようにしたものである。The present invention is a method of supplying power with a constant DC equivalent resistance, that is, a constant current supply function for supplying constant current to a power supply circuit, or a constant voltage between communication lines. The constant voltage power supply function is added to easily perform this when the power supply method needs to be changed, such as when sending a talkie at once. Moreover, the present invention realizes this by a power supply circuit corresponding to the subscriber without being pulled into another circuit.

〔発明の実施例〕Example of Invention

第３図及び第４図は、それぞれ定電流供給、定電圧供給
機能を付加した本発明による給電回路の各実施例を示し
たもので、９はスイッチ、10は定電流回路、11は定電圧
回路である。FIGS. 3 and 4 show respective embodiments of the power supply circuit according to the present invention to which a constant current supply function and a constant voltage supply function are added, respectively. 9 is a switch, 10 is a constant current circuit, and 11 is a constant voltage. Circuit.

以下、本発明による実施例を第１図を用いて詳細に説明
する。第１図は、第３図を一層具体的に示したものであ
る。負荷抵抗100により加入者線ループが形成される
と、抵抗101、スイッチ108、カレントミラー106,105を
介し抵抗104へ電流が流れる。これがトランジスタ102の
バイアスとなり、抵抗104と抵抗103の抵抗比に応じた増
幅率でトランジスタ102のコレクタ電流が流れ、負荷抵
抗100へ給電する。回路の下半分は対照なので説明は省
略する。An embodiment according to the present invention will be described in detail below with reference to FIG. FIG. 1 shows FIG. 3 more specifically. When the subscriber line loop is formed by the load resistor 100, a current flows through the resistor 101, the switch 108, and the current mirrors 106 and 105 to the resistor 104. This becomes a bias of the transistor 102, the collector current of the transistor 102 flows at an amplification factor according to the resistance ratio of the resistors 104 and 103, and power is supplied to the load resistor 100. The lower half of the circuit is a control, so its explanation is omitted.

今、抵抗101をR/2、これを流れる電流をI1とし、負荷抵
抗100をRL、これを流れる電流をILとする。カレントミ
ラー及びトランジスタを全部含めた増幅率をＡとすると
次式が成り立つ。Now, assume that the resistor 101 is R / 2, the current flowing through it is I 1 , the load resistor 100 is R L , and the current flowing through it is I L. When the amplification factor including all of the current mirror and the transistor is A, the following equation holds.

IL＝Ａ・IL（但し、Ａ≫１） VBB＝RL・IL＋Ｒ・I1 これは、ILが抵抗値Ｒと増幅率Ａで決まる定抵抗で給電
されることを示す。I L = A ・ I L (However, A >> 1) V BB = R L・ I L + R ・ I 1 This indicates that it is powered by the constant resistance determined by the amplification factor A I L is the resistance value R.

次に、スイッチ108,208が切換わったとする。この時負
荷抵抗100へ供給される電流は定電流源110、カレントミ
ラー109,105を経て、トランジスタ102が駆動されて決ま
る。すると、負荷の抵抗値に依らず、負荷電流が一定と
なる。即ち、定電流源の電流をIKとすると、 IL＝Ａ・IK（Ａ≫1,IK：一定） となり、定電流給電となる。スイッチ108,208は、カレ
ントスイッチで、半導体素子で容易に実現できるもので
ある。図示しない制御信号でこのスイッチを切換える事
により、定抵抗給電と定電流給電の選択が可能である。Next, assume that the switches 108 and 208 are switched. At this time, the current supplied to the load resistor 100 is determined by driving the transistor 102 via the constant current source 110 and the current mirrors 109 and 105. Then, the load current becomes constant regardless of the resistance value of the load. That is, assuming that the current of the constant current source is I K , I L = A · I K (A >> 1, I K : constant), and constant current feeding is performed. The switches 108 and 208 are current switches and can be easily realized by semiconductor elements. By switching this switch with a control signal (not shown), constant resistance power feeding or constant current power feeding can be selected.

例えば、一斉トーキー送出時には、10mA程度の定電流給
電を行えば、近端の加入者に対応する加任者回路で消費
電力が増加したり、遠端の加入者に対して電圧、電流が
不足したり、といった問題が無くなる。For example, when sending a simultaneous talkie, if a constant current of about 10 mA is supplied, power consumption will increase in the assigner circuit corresponding to the near-end subscriber, and voltage and current will be insufficient for the far-end subscriber. There is no problem such as doing.

次に、第２の実施例を第５図示に示す。これは第４図を
具体的に示したもので、従来の給電部分は、第４図と同
様であり、111,211はカレントミラー、112,212は定電流
源である。また、108′,208′はスイッチ108,208に連動
するスイッチである。スイッチ108,208が切換わると、
抵抗101,201を流れる電流が一定になるように動作す
る。従って、負荷抵抗100の両端の電圧は常に一定であ
る。回路動作は容易に分かるので詳しい説明は省略す
る。これにより第１の実施例と同等の効果が得られる。Next, a second embodiment is shown in FIG. This is specifically shown in FIG. 4. The conventional power feeding part is the same as that in FIG. 4, 111 and 211 are current mirrors, and 112 and 212 are constant current sources. Further, 108 'and 208' are switches interlocking with the switches 108 and 208. When the switches 108 and 208 are switched,
It operates so that the current flowing through the resistors 101 and 201 becomes constant. Therefore, the voltage across the load resistor 100 is always constant. Since the circuit operation can be easily understood, detailed description is omitted. As a result, the same effect as that of the first embodiment can be obtained.

〔発明の効果〕〔The invention's effect〕

本発明によれば、他の回路へ加入者線を引き込んで給電
方式を変える必要がなくなる。従って、引き込みに必要
なスイッチ及び給電部分を、加入者対応に集積化された
電子回路に取り込む事が容易になり、より経済的であ
る。According to the present invention, it is not necessary to lead the subscriber line to another circuit to change the power feeding system. Therefore, it becomes easier to incorporate the switch and the power feeding portion required for the pull-in into the integrated electronic circuit corresponding to the subscriber, which is more economical.

また、従来の電話機だけでなく、新たに設計される電子
化端末に対し、その特性に応じた給電を行う事が出来る
ようになる。Further, not only the conventional telephone but also a newly designed computerized terminal can be supplied with power according to its characteristics.

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

第１図は本発明の第１の実施例を示す回路図、第２図は
従来の給電回路を説明するための図、第３図及び第４図
は本発明の第１及び第２の実施例を説明するための図、
第５図は本発明の第２の実施例を示す回路図である。 １……負荷抵抗、２……給電回路 ９……切換えスイッチ、10……定電流回路 11……定電圧回路、100……負荷抵抗 108,208,108′,208′，……スイッチ 102,202……給電用パワートランジスタ 101,103,104,107,201,203,204,207……抵抗 105,106,107,109,111,205,206,207,209,211……カレン
トミラー 110,112,210,212……定電流源FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a diagram for explaining a conventional feeding circuit, and FIGS. 3 and 4 are first and second embodiments of the present invention. Figure to explain example,
FIG. 5 is a circuit diagram showing a second embodiment of the present invention. 1 ... Load resistance, 2 ... Feeding circuit 9 ... Changeover switch, 10 ... Constant current circuit 11 ... Constant voltage circuit, 100 ... Load resistance 108,208,108 ′, 208 ′, ... Switch 102,202 …… Feeding power Transistors 101, 103, 104, 107, 201, 203, 204, 207 ... Resistors 105, 106, 107, 109, 111, 205, 206, 207, 209, 211 ... Current mirrors 110, 112, 210, 212 ... Constant current sources

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】ディジタル交換機の通話電流供給回路にお
いて、定抵抗定電圧給電を行なうための、増幅器と帰還
回路で形成される帰還ループと、定電流給電を行なうた
めの、該増幅器の入力側に接続可能な定電流源と、該帰
還ループを切断し、同時に該定電流源を接続する電子ス
イッチを具備し、該電子スイッチを切換える事により給
電方式を変化させることを特徴とする加入者線給電方
式。1. In a speech current supply circuit of a digital exchange, a feedback loop formed by an amplifier and a feedback circuit for supplying constant resistance and constant voltage, and an input side of the amplifier for supplying constant current. A subscriber line power supply characterized by comprising a connectable constant current source and an electronic switch for disconnecting the feedback loop and simultaneously connecting the constant current source, and changing the power supply system by switching the electronic switch. method.
JP20624784A 1984-10-03 1984-10-03 Subscriber line power supply system Expired - Lifetime JPH06101772B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20624784A JPH06101772B2 (en) 1984-10-03 1984-10-03 Subscriber line power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20624784A JPH06101772B2 (en) 1984-10-03 1984-10-03 Subscriber line power supply system

Publications (2)

Publication Number Publication Date
JPS6184955A JPS6184955A (en) 1986-04-30
JPH06101772B2 true JPH06101772B2 (en) 1994-12-12

Family

ID=16520170

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20624784A Expired - Lifetime JPH06101772B2 (en) 1984-10-03 1984-10-03 Subscriber line power supply system

Country Status (1)

Country Link
JP (1) JPH06101772B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1291836C (en) * 1987-06-17 1991-11-05 Kenji Takato Battery feed circuit
AU7354291A (en) * 1990-03-16 1991-11-14 Fujitsu Limited Feed circuit in exchanger

Also Published As

Publication number Publication date
JPS6184955A (en) 1986-04-30

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