JPS59114960A - Feed circuit - Google Patents
Feed circuitInfo
- Publication number
- JPS59114960A JPS59114960A JP57224526A JP22452682A JPS59114960A JP S59114960 A JPS59114960 A JP S59114960A JP 57224526 A JP57224526 A JP 57224526A JP 22452682 A JP22452682 A JP 22452682A JP S59114960 A JPS59114960 A JP S59114960A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power supply
- current
- supply circuit
- communication current
- 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
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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
Description
【発明の詳細な説明】
（ａｌ 発明の技術分野
本発明はディジタル交換機等の電子式通話電流供給回路
に係り、特に消費電力を節減可能な給電回路に関す。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an electronic communication current supply circuit for a digital exchange or the like, and particularly to a power supply circuit capable of reducing power consumption.
（ｂ） 技術の背景
ディジタル交換機等の如く、通話路網を半導体素子で構
成する装置においては、加入電話機に対する通話電流の
供給機能は各加入者回路に付与されている。収容加入者
数分実装せねばならぬ加入者回路を高密度実装して装置
を小形化且つ経済化する為に、半導体集積回路を主体と
した電子式通話電流供給回路が使用される。この種電子
式通話電流供給回路においては、温度上昇の抑制並びに
電力の有効利用の面から、回路内での消費電力を極力節
減することが必要となる。(b) Background of the Technology In a device such as a digital exchange, in which a communication path network is constructed of semiconductor elements, each subscriber circuit is given the function of supplying communication current to subscriber telephones. In order to make the device more compact and economical by densely mounting subscriber circuits that must be mounted for the number of accommodated subscribers, electronic communication current supply circuits based mainly on semiconductor integrated circuits are used. In this type of electronic communication current supply circuit, it is necessary to reduce power consumption within the circuit as much as possible from the viewpoint of suppressing temperature rise and effectively utilizing power.
（（＋） 従来技術と問題点
第１図はこの種従来ある給電回路の一例を示す図である
。第１図において、給電回路は通話線ａおよびｂ間に接
続される負荷抵抗ＲＬに対し通話電流Ｉを供給する。通
話線ａに対しては、増幅器ＡＩおよび抵抗Ｒ１が直流電
圧■１から通話電流工を供給し、通話線すに対しては、
増幅器Ａ２および抵抗Ｒ２が地気Ｇから通話電流を供給
する。((+) Prior Art and Problems Fig. 1 is a diagram showing an example of a conventional power supply circuit of this kind. In Fig. 1, the power supply circuit is configured to A communication current I is supplied.For the communication line a, an amplifier AI and a resistor R1 supply a communication current from the DC voltage 1;
Amplifier A2 and resistor R2 supply the talking current from earth G.
増幅器Ａ１およびＡ２は増幅度１の非反転増幅器である
。従って増幅器Ａ２は、動作点を適正に設定する為に抵
抗Ｒ３を介して入力される直流電圧ｖ２を出力する。そ
の結果直流電圧ｖ２と通話線すとの間の直流インピーダ
ンスは抵抗Ｒ２となる。Amplifiers A1 and A2 are non-inverting amplifiers with an amplification factor of 1. Therefore, amplifier A2 outputs DC voltage v2 which is input via resistor R3 in order to properly set the operating point. As a result, the DC impedance between the DC voltage v2 and the communication line becomes the resistance R2.
一方墳幅器Ａ１には、直流電圧Ｖ１と通話線８間の直流
電圧Ｖａが、抵抗Ｒ５およびＲ６から成る分圧器、抵抗
Ｒ７およびコンデンサＣ５から成る低域ろ波器、および
増幅度１の非反転増幅器Ａ４から構成される直流帰還回
路ＤＦＬ、および抵抗Ｒ４を介して入力される。その結
果増幅器Ａ１からは直流電圧Ｖａ （Ｒ６／ （Ｒ５＋
Ｒ６））が出力され、また直流電圧Ｖ１と通話線ａとの
間の直流インピーダンスはＲ１（１＋Ｒ６／Ｒ５）とな
る。なお通話線ａおよび５間に印加される交流信号に対
する交流インピーダンスは、差動増幅器Ａ３、コンデン
サＣ１およびＣ２から構成される交流帰還回路ＡＦＬに
より高インピーダンスに維持される。On the other hand, in the amplifier A1, the DC voltage Va between the DC voltage V1 and the communication line 8 is passed through a voltage divider consisting of resistors R5 and R6, a low-pass filter consisting of a resistor R7 and a capacitor C5, and a non-linear amplifier with an amplification factor of 1. It is inputted via a DC feedback circuit DFL composed of an inverting amplifier A4 and a resistor R4. As a result, the amplifier A1 outputs a DC voltage Va (R6/ (R5+
R6)) is output, and the DC impedance between the DC voltage V1 and the communication line a is R1 (1+R6/R5). Note that the AC impedance for the AC signal applied between the communication lines a and 5 is maintained at high impedance by the AC feedback circuit AFL composed of the differential amplifier A3 and the capacitors C1 and C2.
以上の説明から明らかな如く、従来ある給電回路にお−
いては、負荷抵抗ＲＬに対する通話電流Ｉは、常に直流
電圧Ｖ１およびｖ２から直流インピーダンスＲ１（１＋
Ｒ６／Ｒ５）およびＲ２を介して供給される。通常直流
電圧ｖ１および■２はそれぞれ一４８ボルトおよび約−
３ボルトに設定され、また前記直流インピーダンスＲ１
（１＋Ｒ６／Ｒ５）およびＲ２の合計は約４００オーム
に設定される。かかる場合には、例えば加入電話機が極
く近くに設置され負荷抵抗ＲＬが最低約１００オームと
なると、通話電流Ｉは約９０ミリアンペアとなり、給電
回路内で３ワット以上の電力が無駄に消費されることと
なり、発熱量も増加する欠点が有った。As is clear from the above explanation, conventional power supply circuits
In this case, the communication current I to the load resistance RL always changes from the DC voltages V1 and v2 to the DC impedance R1(1+
R6/R5) and R2. Normally, the DC voltages v1 and ■2 are approximately -48 volts and -
3 volts, and the DC impedance R1
The sum of (1+R6/R5) and R2 is set to approximately 400 ohms. In such a case, for example, if the subscriber telephone is installed very close and the load resistance RL is at least about 100 ohms, the call current I will be about 90 milliamps, and more than 3 watts of power will be wasted in the power supply circuit. Therefore, there was a drawback that the amount of heat generated also increased.
（ｄ） 発明の目的
本発明の目的は、前述の如き従来ある給電□回路の欠点
を除去し、負荷抵抗が最低の場合における給電回路内の
無効消費電力を極力抑制する手段を実現することに在る
。(d) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional power supply circuit as described above and to realize a means for suppressing the reactive power consumption in the power supply circuit as much as possible when the load resistance is the lowest. exist.
（ｅｌ 発明の構成
この目的は、電子式通話電流供給回路において、複数種
類の給電電圧と、供給する通話電流を監視する手段とを
設け、該手段の監視する通話電流値に対応して前記給電
電圧を切替え使用することにより達成される。(el) Structure of the Invention This object is to provide an electronic communication current supply circuit with a plurality of types of power supply voltages and a means for monitoring the communication current to be supplied, and to adjust the power supply according to the communication current value monitored by the means. This is achieved by switching the voltage.
（ｆｌ 発明の実施例 以下、本発明の一実施例を図面により説明する。(fl Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.
第２図は本発明の一実施例による給電回路を示す図であ
る。なお、企図を通じて同一符号は同一対象物を示す。FIG. 2 is a diagram showing a power supply circuit according to an embodiment of the present invention. Note that the same reference numerals refer to the same objects throughout the plan.
第２図においては、通話線ａに対する給電電圧として、
直流電圧ｖ１以外により低電圧の直流電圧Ｖ３（例えば
−４８ボルトの直流電圧Ｖｌに対し、直流電圧■３は一
２４ボ、ルト）が設けられており、また通話電流Ｉの監
視手段として、比較器ＣＭＰが設けられている。該比較
器ＣＭＰの出力に設けられているリレーＳが復旧してい
る場合には、直流電圧ｖｉが接点ａ１を介して増幅器Ａ
１に接続され、第１図におけると同一の通話電流Ｉが負
荷抵抗ＲＬに供給される。かかる状態で比較器ＣＭＰは
直流帰還回路ＤＦＬの出力する直流電圧Ｖｌ−１−Ｒ１
・Ｒ６／Ｒ５を監視し、通話電流Ｉが所定値より増加し
た為に予め設定されている基準電圧ｖ４以下となったこ
とを検出した場合には、リレーＳを動作させる。その結
果増幅器Ａ１に接続されている給電電圧は直流電圧Ｖｌ
から直流電圧ｖ３に切替えられる。かかる場合には通話
電流Ｉは直流電圧■３およびｖ２から前記直流インピー
ダンスＲ１（１＋Ｒ５／Ｒ５）およびＲ２を介して供給
され、直流電圧■１対■３に比例して減少する。なお比
較器ＣＭＰは充分な履歴特性を具備している為、通話電
流■の減少に伴い直ちにリレーＳを復旧させることは防
止される。In FIG. 2, as the power supply voltage for the communication line a,
In addition to the DC voltage v1, a lower DC voltage V3 (for example, DC voltage V1 is -48 volts, DC voltage 3 is -24 volts) is provided, and as a means for monitoring the communication current I, a comparative A device CMP is provided. When the relay S provided at the output of the comparator CMP is restored, the DC voltage vi is applied to the amplifier A via the contact a1.
1, and the same talking current I as in FIG. 1 is supplied to the load resistor RL. In this state, the comparator CMP outputs the DC voltage Vl-1-R1 from the DC feedback circuit DFL.
- Monitor R6/R5, and if it is detected that the communication current I has increased above a predetermined value and has become below a preset reference voltage v4, the relay S is activated. As a result, the supply voltage connected to amplifier A1 is a direct voltage Vl
to DC voltage v3. In such a case, the communication current I is supplied from the DC voltages 3 and v2 through the DC impedances R1 (1+R5/R5) and R2, and decreases in proportion to the DC voltages 1 and 3. Note that since the comparator CMP has sufficient history characteristics, it is prevented from immediately restoring the relay S when the communication current (2) decreases.
以上の説明から明らかな如く、本実施例によれば、比較
器ＣＭＰは通話電流■を常時監視し、所定値以上である
ことを検出した場合には給電電圧を直流電圧Ｖｌから直
流電圧ｖ３に切替えることにより、消費電力を減少させ
る。前例によれば、−４８ボルトの直流電圧ｖ１から一
２４ボルトの直流電圧Ｖ３に切替えることにより、給電
回路内で無効消費される電力も約半減し、発熱量も大幅
に減少する。As is clear from the above description, according to this embodiment, the comparator CMP constantly monitors the call current ■, and when it detects that it is above a predetermined value, changes the power supply voltage from the DC voltage Vl to the DC voltage v3. By switching, power consumption is reduced. According to the previous example, by switching from -48 volts DC voltage v1 to 124 volts DC voltage V3, the power consumed ineffectively in the power supply circuit is reduced by approximately half, and the amount of heat generated is also significantly reduced.
なお、第２図はあく迄本発明の一実施例に過ぎず、例え
ば直流電圧ｖ１および■３はそれぞれ一４８ボルトおよ
び一２４ボルトに限定されることは無く、他に幾多の数
値が考慮されるが、何れの場合にも本発明の効果は変ら
ない。また給電電圧は２種類（ｖｌおよびＶ３）に限定
されることば無く、３種類以上の場合も考慮されるが、
かかる場合にも本発明の効果は変わらない。更に本発明
の対象とする給電回路の構成は図示されるものに限定さ
れぬことは言う迄もない。Note that FIG. 2 is only one embodiment of the present invention, and for example, the DC voltages v1 and (3) are not limited to 148 volts and 124 volts, respectively, and many other values may be considered. However, the effects of the present invention remain the same in either case. In addition, the power supply voltage is not limited to two types (vl and V3), and a case of three or more types is also considered.
Even in such a case, the effects of the present invention remain unchanged. Furthermore, it goes without saying that the configuration of the power supply circuit to which the present invention is applied is not limited to that shown in the drawings.
（ｇｌ 発明の効果
以上、本発明によれば、前記装置において、負荷抵抗が
最低の場合における給電回路内の無効消費電力が大幅に
節減可能となり、発熱量も大幅に減少することが出来る
。(gl) Effects of the Invention According to the present invention, in the device, the reactive power consumption in the power supply circuit when the load resistance is the lowest can be significantly reduced, and the amount of heat generated can also be significantly reduced.
第１図は従来ある給電回路の一例、を示す図、第２図は
本発明の一実施例による給電回路を示す図である。
図において、ＡＩ、Ａ２およびＡ ４ ＆！増幅器、Ａ
３は差動増幅器、ＣＭＰは比較器、ＤＦＬは直流帰還回
路、ＡＦＬは交流帰還回路、ＬＰＦは低域ろ波器、Ｓは
リレー、ＳｌおよびＳ２は接点、Ｒ，Ｌは負荷抵抗、Ｒ
１乃至Ｒ７は抵抗、Ｃ１乃至Ｃ５はコンデンサ、ａおよ
びｂは通話線、ｖｌ乃至■３、Ｖａおよびｖｂは直流電
圧、■４は基準電圧、■は通話電流、を示す。
＄ Ｉ 囚
２
第２図
２FIG. 1 is a diagram showing an example of a conventional power supply circuit, and FIG. 2 is a diagram showing a power supply circuit according to an embodiment of the present invention. In the figure, AI, A2 and A 4 &! amplifier, A
3 is a differential amplifier, CMP is a comparator, DFL is a DC feedback circuit, AFL is an AC feedback circuit, LPF is a low-pass filter, S is a relay, SL and S2 are contacts, R and L are load resistances, R
1 to R7 are resistors, C1 to C5 are capacitors, a and b are communication lines, vl to 3, Va and vb are DC voltages, 4 is a reference voltage, and 2 is a communication current. $ I Prisoner 2 Figure 2 2
Claims (1)
と、供給する通話電流を監視する手段とを設け、該手段
の監視する通話電流値に対応して前記給電電圧を切替え
使用することを特徴とする給電回路。The electronic communication current supply circuit is characterized in that a plurality of types of power supply voltages and means for monitoring the supplied communication current are provided, and the power supply voltage is switched and used in accordance with the communication current value monitored by the means. power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57224526A JPS59114960A (en) | 1982-12-21 | 1982-12-21 | Feed circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57224526A JPS59114960A (en) | 1982-12-21 | 1982-12-21 | Feed circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59114960A true JPS59114960A (en) | 1984-07-03 |
Family
ID=16815176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57224526A Pending JPS59114960A (en) | 1982-12-21 | 1982-12-21 | Feed circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59114960A (en) |
-
1982
- 1982-12-21 JP JP57224526A patent/JPS59114960A/en active Pending
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