JPS6342267A

JPS6342267A - Speech current supply circuit

Info

Publication number: JPS6342267A
Application number: JP61186393A
Authority: JP
Inventors: Shoichi Abe; 正一阿部; Masaki Yagyu; 柳生　正樹; Noriyuki Kawamura; 仙志河村
Original assignee: NEC Corp; Nippon Telegraph and Telephone Corp
Current assignee: NEC Corp; Nippon Telegraph and Telephone Corp
Priority date: 1986-08-07
Filing date: 1986-08-07
Publication date: 1988-02-23

Abstract

PURPOSE:To prevent a remarkable increase in a power consumed in the biasing circuit of an operational amplifier by switching a bias current path when a supply voltage at a positive power source side is decided to be a ground and when it is decided to be a prescribed positive voltage. CONSTITUTION:When as the power source for supplying a speech current, the at a 8 line side (positive power source side) and -48V of an A line side (negative power source side) are used, a transistor Q1 is turned off and a transistor Q0 is turned on. When as the power source, the earth of the B line side is switched to +50V, the Q1 is turned on and the transistor Q0 is turned off. By properly selecting the constants of constant voltage diodes DA, DB and resistors R1, R2, a current passing to the bias circuit can be set to the same value at the time of the ground-- 48V as the power source and at the time of +50-- 48V. Thereby, a consuming power can be limited to the increase proportional to the change in the supply voltage.

Description

【発明の詳細な説明】〔産業上の利用分野〕本発明は自動式電話交換機に関し、特に交換機間の通話
接続に用いられる人トランクと出トランク間に通話電流
を供給するための通話電流供給回路に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic telephone exchange, and more particularly to a call current supply circuit for supplying call current between a person trunk and an outgoing trunk used to connect calls between exchanges. Regarding.

[Conventional technology]

従来、交換機間の通話電流の供給を行なう場合は、第２
図に示すように人トランクにある通話電流供給回路から
直流電流を供給し、出トランクにある直流ループ回路で
その電流をループし、通話信号はコンデンサで結合する
ことが行なわれている。ここで、通話電流供給回路およ
び直流ループ回路は交流信号に対して高インピーダンス
であることは言うまでもない。Conventionally, when supplying communication current between exchanges, the second
As shown in the figure, a DC current is supplied from a communication current supply circuit in the passenger trunk, the current is looped in a DC loop circuit in the outgoing trunk, and the communication signal is coupled with a capacitor. Here, it goes without saying that the communication current supply circuit and the DC loop circuit have high impedance with respect to AC signals.

従来の通話電流供給回路は、第３図に示すような直流低
抵抗、交流高インピーダンスを有する線輪が使用されて
きた。しかし、近年の電子回路部品の低価格化お上び電
子回路技術の発達により第４図に示すような電子化通話
電流供給回路が考えられた（特願昭６０−０６６２７４
）。これは、直流低抵抗、交流高インピーダンスの機能
において第３図の回路と等価−〇あＫ）。。In the conventional communication current supply circuit, a coil having low DC resistance and high AC impedance as shown in FIG. 3 has been used. However, due to the recent reduction in the price of electronic circuit components and the development of electronic circuit technology, an electronic telephone current supply circuit as shown in Fig. 4 was devised (Patent Application No. 60-066274).
). This is equivalent to the circuit in Figure 3 in terms of low DC resistance and high AC impedance functions. .

〔発明か解決しようど−Ｊ−ｇ、問題点〕第：１　［’
Ｘｌと第４図の回１洛機、能気、）５い゛（％なて）′
（−いる機ｒｉｋｋｉ種々あルカ、消費７？Ｌ力（Ｄ　
Ｊ　イＬ）ｆ　ｔＢ　ｉ　Ｑて゛あり、第３図の回Ｉ洛
に６表５いては消費′Ｉ′ｉ℃７ｊば次代に承ず、ｌｒ
うに線路に供給ず七〕電冶、の２東ど腺伯１゜の内部直
流低１抗を東じＩ、・値どＣ（る、、線輪りの消費′、
“ｒテカ−・（線！？、　′：ｒｉ’涜、）２×戟口・
合内部の「白ン危１氏わ“１．　・・・・・（１）第４
図Ｌ　示１回路、（、：　Ｊ、５　（７’ｔ　−Ｃｉｆ
　、　Ｔ’ｚ　ｔｙ以外ｉ、：　Ｍｌｉ算増算器幅器駆
動ｒるためθ）ハ（デス電流（’４【ｉ　：（、’、（
増幅器の（＋Ｖ）および（−Ｖ　）ダニ供給ｊ゛る′Ｉ
′Ｈｆｌ圧）およ（び訟バイアス′１８：流を作成−・
ｊ−ろ）：二めの５Ｔ源回路−Ｃ消イ？ざＡ１゜る′電
力が加わり、ざら１ば直流、担、抗を（／、るＩ；コめ
の電ＪｉＦ検出１氏抗；Ｈ；ｎＡｏ、　＋＋Ａ＋、　ｎ
旧］および旧）１で消費１でドわる′Ｉ賞力が加算Ｈ″
（、をン４、・二、１１がＧ耶：’＋　９１の回路ａす
・のメ・ン、Ｉ：なり、第４図の回路は第３図の回路に
一１比へて消費電力が大きい１．ざら（り二、第４図に
おい−（゛χ：イシ１か悪いのい：ｊｎ話′載締１供給
分−）　５０Ｖ苓・イリ・ＪＩｉ　Ｌ　ｒ行ξぐ勺場僑
に、定電圧ダ（：ｌ−＝〜ドＩ）＋＋、１氏わ）６器旧
）：（に加わ；＋、　＋７Ｃ：　Ｄかシー５０　Ｖ　、
ｌ１ｆｌ　’ｉ”’、’、Ｉ　：’＜　ｉｌ　；、ｉ、
・パど−（，シ）Ｋ・１、　　イシ１１どＩ・−（低ｔ
ｊ１；詔ＩＩＩ　：ｌ　ノン１）１１ζ（λ、１１１　
”ＩＩｃ　１１−＋、、λ【オー　１・［）１（永・’
、！’１％’（７）’ｒＹ１７：’、ｒＪＢ：’Ｊ’イ
′”ｔ”’−−−！”１：１．、ｙ−’ＣＣ：−−−４
８Ｖ−Ｃ，ｊｒｌ、：、’。[Let's Invent or Solve - J-g, Problems] No. 1 ['
Xl and Figure 4 times 1 Raku function, Noki, ) 5 ゛ (%)'
(-There are various machines rikki, consumption 7? L power (D
J I L) f t B i Q ゛, and in the turn I of Figure 3, 6 Table 5 shows that consumption ′I′i℃7j will not be passed on to the next generation, and lr
The internal direct current low 1 resistor of the electric wire is supplied to the railway line.
“rteka・(line!?, ′:ri’blasphemy,) 2×戟口・
Inside the meeting, “Mr. White is in danger” 1. ...(1) Fourth
Figure L shows 1 circuit, (,: J, 5 (7't -Cif
, T'z ty other than i,: Mli multiplier width circuit driving r) HA(death current ('4[i :(,',(
Amplifier's (+V) and (-V) supply voltage
'Hfl pressure) and (and bias '18: Creating flow-・
j-ro): Second 5T source circuit-C off? Electric power is added to ZA1゜', and ZA1 is DC, conductor, resistor (/, RuI; Komenoden JiF detection 1 resistor; H; nAo, ++A+, n
old] and old) 1 and consumption 1 ``I prize power added H''
(, 4, 2, 11 are G:'+ 91's circuit a, main, I:, and the circuit in Figure 4 consumes less power than the circuit in Figure 3 by 11). 1. Zara (Riji, Fig. 4 smell - (゛χ: Ishi 1 or bad: Jn story 'Jijime 1 supply -) 50V Rei, Iri, JIi L r row ξ to the locals , constant voltage da (:l-=~do I)++, 1 degree): (added to ;+, +7C: D or sea 50 V,
l1fl 'i''',',I:'<il;,i,
・Pado-(,shi)K・1, Ishi11doI・-(low t
j1; Edict III: l non 1) 11ζ (λ, 111
``IIc 11-+,,λ [Oh 1・[)1(Eng・'
,! '1%' (7) 'rY17:', rJB: 'J'i'"t"'---! "1:1.,y-'CC:---4
8V-C, jrl:,'.

′市冶、イ１供給−・）る＋、［、；　、、Ａ、の）＼
ｒ′−、、ｊ’　、ｌ、回（１゛トハ消費電ｊ）Ｗ　Ｌ
、８・、イ・・Ｍ７　’−ｔ’−１ζ、゛、と＝　０．
４８（Ｗ）となる。'Ichiji, I1 supply -・)ru+, [,; ,,A,'s)\
r'-,, j', l, times (1゛toha power consumption j) W L
, 8., I...M7 '-t'-1ζ, ゛, and = 0.
48 (W).

ン欠　ｊ（：　、　　１１０話′４君）介、（ン）イ１
（給　う・　：［）ｆｌ　＼ｌ　（、−１−）ｊ　リ　
）１　、く　メｌ−＝　、ｔｊ、５　　白に１．５（・
づるペイ“ｊ′”ス回ｊ洛の消゛（′υ７ＨＩ；力位′
ら；弓［１す９：）どＩｊ　＋１　、０　（’、’ｌ）ど八木；曙′）５、以ｆ−ｔｌ）　＆ｉは　例τ゛あモ゛）か他の、パの１
Ｊ、’、：））’４値イに′設置１＝１−・“（，７′
）Ｂ線側（［「′べ１：源側）（ワ）で’ｊｉ　！、Ｘ
増：［１（”ｌｊ　Ｉ’！＋いハｊ、・めのハ゛１′−
１”、ス回肖１．Ｃ・旨白Ｔｌ　、、：＼、１′１　る
′Ｉ′Ｉ）１力は　）　００Ｖに二［力Ｐ）替；Ｚ−る
、ニーと１・二Ｊ：：　１１人帖冒、′増加Ｌｊ”　ｌ
ｒ　、　ｔ、：イ７）よ−）な消費電力（、；（回Ｈ７
（、の放λ！’ｉ　ｔ、７’、）問題ど、゛、ρす１、
；−７：：腺７４冒、〜供給４霧″、／：こめｊい一再
ｔ！−接、必要ノ、ｉ電１ツノ（已１、；ｌ　ｉぐく、
こ」１（、ばて］２ない１：とが望ｊミしい４゜（間２１点をｊ惺伏ず′！：１人：めの手Ｉｔ　）本兄
明の通話電流ｆｊｊ給回ｊＪ３　ｉ、ま、ｋｇ路へ供給
ずろｉｒ−、’、Ｗ源の電Ｊ’ｌ−タ・検出する検出手
段′と、前記検出二［！９　ｈ＝お１７’ｌ　−（、’
ｉＥ　′、Ｘｉ　源側’ＴＣ源ｊＨｉ：　／ＴカＪｊｉ
＋気）：　ｔｌｌ　定Ｎ　、４−１．　ｆ：場合には、
１１−電源側演算増幅回路、σ）ハｆ′アス′准流を地
気側からｆ、　′Ｉｉｊ源側演算増幅回路へとｊｌＪ　
ｌｐ　ｊ；；−：ｆ。N missing j(: , 110th episode'4-kun), (n)i1
(supply) :[)fl \l (,-1-)j li
) 1, kume l-= , tj, 5 1.5 (・
Zurupay “j′” times J Raku no disappearance (′υ7HI; power position′)
ra; Bow [1 9:) Do Ij +1 , 0 (', 'l) Do Yagi; Akebono') 5, here f-tl) &i is example τ゛゛゛) or other, Pa's 1
J,',:))'Installation 1=1-・"(,7'
) B line side (['be1: source side) (wa) 'ji!, X
Increase: [1("lj I'!+Ihaj,・Menoha゛1'-
1", Su time 1. C. Shiro Tl, : \, 1'1 ru'I'I) 1 force is ) 00V to 2 [force P); Z-ru, knee and 1.2 J :: 11 people chapter adventure, 'increase Lj' l
r, t, :I7) Yo-) power consumption (,;(timeH7)
(,'s radiation λ!'it,7',)problem,゛,ρs1,
;-7:: 74 glands affected, ~supply 4 mist'', /: Kome j i 1 re t! - connection, necessary no, i electric 1 horn (已 1,; l i guku,
1 (21 points) 1: It's hopeless 4゜ (21 points between them without bowing down!: 1 person: It's my hand) My brother's telephone current fjj supply circulation jJ3 A detection means for detecting the electric current of the W source, and a detection means for detecting the voltage supplied to the i, ma, kg road.
iE ′, Xi source side'TC source jHi: /T ka Jji
+ Qi): tll constant N, 4-1. f: In case,
11 - Power supply side operational amplifier circuit, σ) Haf'As' quasi-flow from the earth side to f,'Iij source side operational amplifier circuit jlJ
lp j;;-:f.

１段と、前記検出１段に、８いてｉＦ電源側７’、ｒ課
電圧が所定のＩＦ電圧ど判定ざわＩ、コ場合（、ｙＨｌ
、１（モミ源側演算増幅回路のバ（？ス卸；流イぐ［（
（！気相１、′切換え、ざらに−負電源側４１イ算増幅
回周；のバイアス電冶、；Ａ、地気側かｒっ冶１４′Ｖ
、造本ｌ−る手段を含・ｕ　＋’：とイ（・特徴と４６
゜（実施例〕次に、本文、明の実施例（、一ついて図面６・ｅ照し゛
Ｃ説明４″る。If the voltage applied to the iF power supply side 7' and r is a predetermined IF voltage, the first stage of detection and the first stage of detection are
, 1 (bus wholesale of the operational amplifier circuit on the source side; flowing [(
(!Gas phase 1, 'switching, roughly - negative power supply side 41 amplification circuits; bias electric power; A, earth side 14'V
, including the means of making a book ・u +': and i (・characteristics and 46
゜(Example) Next, the main text and the embodiment of the present invention (explanation 4) are given with reference to Figures 6 and 4.

第１図は本分、明の通話電流供給回路の一実施例を示Ｊ
−回路図°で・ある。Figure 1 shows an example of a light communication current supply circuit.
-It is a circuit diagram.

本実施例は、抵抗器１１ＡＯ−１（Ａ２、ＲＢＯ〜・＋
＋　８７．１（０・・・旧、コンデンサＣＡ。に１１、
演算増幅；於；目：Ａ、　ＪＣＢ。In this embodiment, the resistor 11AO-1 (A2, RBO~・+
+ 87.1 (0... old, 11 to capacitor CA.
Operational amplification: A, JCB.

］、ラノンシス（Ｑ八、ｆｌ　［１、Ｑ　０１Ｏ１，−
ターｒ゛オー　Ｆ［ｌＯ。], lannonsis (Q8, fl [1, Q 01O1, -
terr゛o F[lO.

［）ｌ、　Ｄ２、宇７；テＴ［タイ、１−１・ｌ−Ｉ　
Ａ　、　ｌ’ｌ　ｔｌ　、　［）　：［１，Ｙ：ｉ：　
、−、：ｆ’、、、　Ｊ　。[)l, D2, U7; TeT [Tie, 1-1・l-I
A, l'ltl, [):[1,Y:i:
,-,:f',,,J.

＋：、　ｎｎから描成’、　’＜、５４１゛ｉ−いる１
、次、′、：、通ｉ＋１７：’ｊ：　７１ｊｌ、供給Ｊ
［ロバ電、ｌ原、Ｉ、、、　ｊ、、τ１３）ダ♀側りｉ
Ｉ電源側）地）１゜、Ａ線側（ｆ′え′（１を源側）−
・冒（Ｖイ９・イ５ｊ・川じＣ夕いるｊ；＋＋　’ｉ’
ｌ−θ）演算増幅：’Ｈ３１［：Ａ　、　ｌ　（：　［
１の）＼イ”７、−、Ａ電’ｌｉｊ、の７ｉ：ｆｔ１ｌ
、ニー）い（丁説明−１５−る。４：）：ず、抵わ’Ｌ
　：；ｇ旧、　Ｒ２ノ；ｈ”Ｊ８’ｌ　ｋ、５　、ｉ、
【゛メ定′市江りｒオー　ト［ＩＡの？］；：丹−・伊
　（２）　、ｉｔ、か成。８ン“・ｉ−：：：、１１ご
−）１、′Ｉ賞定−・）゛るど、トランジスタ［ｉｌは
−１−７Ｌ、、ｈ　”／　ンｉ）　スフ００＆ｉ　ヘ−
ス’ｒｒＷ　冶、　ｈ”抵抗器ｎａ−Ｈｒ＋、抗：’：
；　Ｒ・ト−Ｊ−＋＞　ンシ、：ｌ。+:, drawn from nn', '<, 541゛i-1
,Next,',:,Through i+17:'j: 71jl,Supply J
[Donkeyden, lhara, I,, j,, τ13) da♀ side i
I power supply side) ground) 1°, A line side (f'e' (1 is the source side) -
・Adverture (Vi9・i5j・kawajiC ゆいるj; ++ 'i'
l-θ) Operational amplification: 'H31[: A , l (: [
1) \i” 7, -, Aden'lij, 7i:ft1l
, nee) I (Ding explanation-15-ru. 4:): zu, resist 'L
:;gold, R2ノ;h"J8'l k, 5, i,
[゛me fixed' Ichie r auto [IA's? ];: Tan-・I (2), it, kanari. 8 "・i-:::, 11 go-) 1, 'I award-・)", transistor [il is-1-7L,, h ''/in i) Suff00&i he-
Resistor na-Hr+, resistance:':
; R. To-J-+> Tonshi, :l.

り００のヘースへど供給１−′≦才Ｌ　−Ｃ、：’ｈン
（−’＜ｒ　、、〈ダイ号−ド１〕Ｏ、Ｄ　ｌ　１ｌｌ
ｌ’ｌ　？’１ｆｆｉ圧１１・′ノンシス、ダ］）１ベ
ース・、工々・ツタ間電汀。Supply to the head of 00 1-'≦L-C, :'hn(-'<r,, <Die number-D1] O, D l 1ll
l'l? '1ffi pressure 11・'nonsis, da]) 1 base, electric power between work and tsuta.

・・・・・・（２）器ＩＣ八、　ＩＣ［ｌには定電圧ダイオードＤＢ、　Ｄ
Ａで作成されるバイアス電圧が供給される。・・・・・・(2) IC8, IC[l has constant voltage diode DB, D
A bias voltage created at A is supplied.

次に、通話電流供給用の電源としてＢ線側の地気が＋５
０Ｖに切り替わ）た場合について説明する。Next, as a power source for supplying communication current, the earth on the B line side is +5
The case where the voltage is switched to 0V) will be explained.

この場合は　（２）式に示した条件ではなく（３）式に
示す条件となり、トランジスタＱ１がオンしトランジス
タＱＯはオフする。In this case, the condition shown in equation (3) is satisfied instead of the condition shown in equation (2), and transistor Q1 is turned on and transistor QO is turned off.

（（５０（Ｖ）＋４８ｍ）−（定電圧ダイオードＤＡ（
７）＋トランジスタＱｌベース・エミッタ電圧・・・・
−（３）なお、抵抗器旧、　Ｒ２の定数、定電圧ダイオードＤＡ
の電圧は　（２）式および（３）式を満足するように設
定することは、電源電圧が４８Ｖから９８Ｖへと約２倍
に変化することから定数の設定は可能である。((50(V)+48m)-(constant voltage diode DA(
7) + Transistor Ql base/emitter voltage...
-(3) In addition, the old resistor, the constant of R2, and the constant voltage diode DA
Since the power supply voltage changes approximately twice from 48V to 98V, it is possible to set a constant so that the voltage satisfies equations (2) and (3).

ドＤ３−地気と流れ、さらに地気−抵抗器Ｒ３−トれ、
定電圧ダイオードＤＡ、ＤＢにより演算増幅器ＩＣＡ、
　ＩｃＢのバイアス電源が得られる。Do D3 - ground air and flow, and ground air - resistor R3 - tore,
Operational amplifier ICA, by constant voltage diodes DA and DB.
A bias power supply of IcB can be obtained.

定電圧ダイオードＤＡ、　ＤＢおよび抵抗器旧、　Ｒ２
の定数を適切に選定することにより、通話電流供給用電
源として地気−一４８ｖの場合と＋５０Ｖ　−−４８Ｖ
との場合でバイアス回路に流れる電流を同じに設定する
ことが可能であり、消費電力も電源電圧の変化に比例し
た増加（約２倍）とすることができる。Constant voltage diode DA, DB and resistor old, R2
By appropriately selecting the constant of
The current flowing through the bias circuit can be set to be the same in both cases, and the power consumption can also be increased (approximately twice) in proportion to the change in power supply voltage.

なお、本実施例では演算増幅回路として演算増幅器を使
用したが、トランジスタで構成してもよい。Note that although an operational amplifier is used as the operational amplifier circuit in this embodiment, it may be constructed using a transistor.

〔発明の効果）以上説明したように本発明は、通話電流供給用電源とし
て一４８Ｖと地気、または−４８Ｖ　ト＋　５０Ｖとを
使用した場合においてその電源電圧の変化を検出し、演
算増幅器のバイアス電流経路を切り換えることにより、
演算増幅器のバイアス用回路で消費される電力の著しい
増加を防止できる効果がある。[Effects of the Invention] As explained above, the present invention detects changes in the power supply voltage when -48V and earth air or -48V and +50V are used as power supplies for supplying communication current, and By switching the bias current path,
This has the effect of preventing a significant increase in the power consumed by the bias circuit of the operational amplifier.

[Brief explanation of drawings]

第１図は本発明の通話電流供給回路の一実施例を示す回
路図、第２図は通話電流供給回路の使用される交換機の
従来の例を示す図、第３図は線輪を使用した通話電流供
給回路の従来例の回路図、第４図は通話電流供給回路の
従来例の回路図である。ＲＡＯ〜ＲＡ３．　Ｉ（ＢＯＮＲＢ３・・・抵抗器、Ｇ
Ａ、　ＣＢ・・・コンデンサ、ＩにＡ、　ＩＣＢ・・・演算増幅器、ＤＡ、　ＤＢ・・・定電圧ダイオード、ＱＡ、　ＱＢ・
・・トランジスタ、Ａ、　Ｂ、　Ｊ、　Ｇ、　ＢＢ−・・端子。第１圓Fig. 1 is a circuit diagram showing one embodiment of the talking current supply circuit of the present invention, Fig. 2 is a diagram showing a conventional example of a switching equipment in which the talking current supply circuit is used, and Fig. 3 is a circuit diagram showing an example of a conventional switching equipment in which the talking current supply circuit is used. 4 is a circuit diagram of a conventional example of a communication current supply circuit. FIG. 4 is a circuit diagram of a conventional example of a communication current supply circuit. RAO~RA3. I(BONRB3...Resistor, G
A, CB...capacitor, A to I, ICB...operational amplifier, DA, DB...constant voltage diode, QA, QB・
...Transistor, A, B, J, G, BB-...terminal. First circle

Claims

[Claims] A communication current supply circuit that includes an operational amplifier circuit and supplies communication current to a line, comprising: a detection means for detecting a voltage of a positive power supply supplied to the line; and a detection means for detecting a voltage of a positive power supply side in the detection means. means for switching the bias current of the operational amplifier circuit on the positive power supply side from the earth air side to the operational amplifier circuit on the negative power supply side when it is determined that the power supply voltage on the positive power supply side is a predetermined positive voltage in the detection means; If it is determined that, the bias current of the operational amplifier circuit on the positive power supply side is switched to the earth side, and further the bias current of the operational amplifier circuit on the negative power supply side is caused to flow from the earth side. Current supply circuit.