JPH0681205B2 - Constant voltage control circuit - Google Patents
Constant voltage control circuitInfo
- Publication number
- JPH0681205B2 JPH0681205B2 JP5483586A JP5483586A JPH0681205B2 JP H0681205 B2 JPH0681205 B2 JP H0681205B2 JP 5483586 A JP5483586 A JP 5483586A JP 5483586 A JP5483586 A JP 5483586A JP H0681205 B2 JPH0681205 B2 JP H0681205B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- power supply
- voltage
- constant voltage
- control circuit
- 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
Links
Classifications
-
- 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
- Continuous-Control Power Sources That Use Transistors (AREA)
- Devices For Supply Of Signal Current (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は電話交換機の加入者回路の直流給電回路におい
て定電圧給電制御を行う定電圧制御回路に係り、特に定
電圧給電制御の低消費電力化と高精度化に好適な定電圧
制御回路に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant voltage control circuit for performing constant voltage power supply control in a DC power supply circuit of a subscriber circuit of a telephone exchange, and more particularly to low power consumption of constant voltage power supply control. And a constant voltage control circuit suitable for high accuracy.
従来の電話交換機の加入者回路の直流給電回路において
定電圧給電特性をうる定電圧制御回路では、定電圧を発
生する帰還ループに高圧系の給電帰還ループの一部を兼
用していた。しかしこの帰還ループは高圧系であるた
め、消費電圧が増大する問題点があった。In a constant voltage control circuit that can obtain a constant voltage power supply characteristic in a DC power supply circuit of a subscriber circuit of a conventional telephone exchange, a feedback loop for generating a constant voltage also serves as a part of a high voltage system power supply feedback loop. However, since this feedback loop is a high voltage system, there is a problem that the consumption voltage increases.
なおこの種の直流給電回路の従来例としては、たとえば
昭和58年電子通信学会総合全国大会予稿集NO.547「給電
特性可変形BSH回路LSIの設計」に記載のものが挙げられ
る。As a conventional example of this type of DC power supply circuit, for example, one described in 1983 Proceedings of the IEICE General National Conference No. 547 "Design of BSH circuit LSI with variable power supply characteristics" can be mentioned.
本発明の目的は電話交換機の加入者回路の直流給電回路
において定電圧給電制御の低消費電力化と高精度化をは
かった定電圧制御回路を提供するにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a constant voltage control circuit which has low power consumption and high accuracy in constant voltage power supply control in a DC power supply circuit of a subscriber circuit of a telephone exchange.
本発明は、従来の直流給電回路における定電圧制御回路
が高圧系の帰還ループで兼用していたのに対し、差動増
幅器を用いた定電圧制御回路を別に設けて帰還ループに
既存のカレントミラーを併用することにより低圧系の帰
還ループを構成し、低消費電力化と高精度化と回路の簡
略化をはかった直流給電回路の定電圧制御回路である。In the present invention, the constant voltage control circuit in the conventional DC power supply circuit is also used as the feedback loop of the high voltage system, while the constant voltage control circuit using the differential amplifier is separately provided and the existing current mirror is provided in the feedback loop. Is a constant voltage control circuit for a DC power supply circuit, which is configured to form a low-voltage feedback loop by using together, and achieves low power consumption, high accuracy, and circuit simplification.
以下に本発明の一実施例を第１図および第２図により説
明する。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
第１図は本発明による電話交換機の加入者回路の直流給
電回路における定電圧制御回路の一実施例を示す回路図
である。第１図において、１は直流給電回路、２は直流
出力増幅器、３は電圧検出器、４はローパスフイルタ、
５は定電圧制御回路である。OP1,OP2は差動増幅器、A1,
A2はカレントミラー、iNは定電流源、R1〜R6は抵抗、C1
は容量、Q1〜Q4はトランジスタ、i1〜i7は各点の電流、
v1,v2,v4が各点の電圧である。第２図（ａ），（ｂ）は
第１図のそれぞれカレントミラーA2,A1の内部等価回路
図である。第２図（ａ），（ｂ）においてQ5,Q6はnpnト
ランジスタ、Q7,Q8はpnpトランジスタである。FIG. 1 is a circuit diagram showing an embodiment of a constant voltage control circuit in a DC power supply circuit of a subscriber circuit of a telephone exchange according to the present invention. In FIG. 1, 1 is a DC power supply circuit, 2 is a DC output amplifier, 3 is a voltage detector, 4 is a low-pass filter,
Reference numeral 5 is a constant voltage control circuit. OP1, OP2 are differential amplifiers, A1,
A2 is a current mirror, iN is a constant current source, R1 to R6 are resistors, C1
Is capacitance, Q1 to Q4 are transistors, i1 to i7 are currents at each point,
v1, v2, v4 are the voltages at each point. FIGS. 2 (a) and 2 (b) are internal equivalent circuit diagrams of the current mirrors A2 and A1 of FIG. 1, respectively. In FIGS. 2A and 2B, Q5 and Q6 are npn transistors, and Q7 and Q8 are pnp transistors.
まず第１図（第２図）の回路構成について説明する。抵
抗R3とカレントミラーA2で直流給電の出力電圧を検出す
る電圧検出器３を構成する。カレントミラーA1はこの電
圧検出器３の出力電流を反転する。抵抗R1と容量C1とト
ランジスタQ1でローパスフイルタ４を構成し、カレント
ミラーA1で反転された出力電流（検出電流）の交流成分
を除去する。差動増幅器OR2と抵抗R4,R5とトランジスタ
Q4で直流給電の電流出力増幅器２を構成し、先のローパ
スフイルタ４の出力により駆動（制御）される。上記の
電圧検出器３→カレントミラーA1→ローパスフイルタ４
→電流出力増幅器２からなる高圧系（電源電圧−48V）
の負帰還ループにより直流給電回路１を構成する。一方
の差動増幅器OP1とトランジスタQ2,Q3と抵抗R2と定電源
源iNで低電圧系（電源電圧±5V）の定電圧制御回路５を
構成し、この定電流制御回路５を上記の負帰還ループの
途中に付加してローパスフイルタ４の電圧降下を電圧電
流変換しカレントミラーA1の入力に帰還することによい
り定電圧給電特性を実現する。First, the circuit configuration of FIG. 1 (FIG. 2) will be described. The resistor R3 and the current mirror A2 constitute a voltage detector 3 which detects the output voltage of the DC power supply. The current mirror A1 inverts the output current of the voltage detector 3. The resistor R1, the capacitor C1, and the transistor Q1 form a low-pass filter 4, and the AC component of the output current (detection current) inverted by the current mirror A1 is removed. Differential amplifier OR2, resistors R4, R5 and transistor
A current output amplifier 2 of DC power supply is constituted by Q4 and is driven (controlled) by the output of the low pass filter 4 described above. Voltage detector 3 → Current mirror A1 → Low pass filter 4
→ High voltage system consisting of current output amplifier 2 (power supply voltage −48V)
The DC feed circuit 1 is configured by the negative feedback loop of. On the other hand, the differential amplifier OP1, the transistors Q2 and Q3, the resistor R2 and the constant power source iN constitute a constant voltage control circuit 5 of a low voltage system (power supply voltage ± 5V), and this constant current control circuit 5 is fed back to the above negative feedback. It is preferable to add it in the middle of the loop to convert the voltage drop of the low-pass filter 4 into a voltage-current conversion and feed it back to the input of the current mirror A1 and realize a constant voltage power supply characteristic.
つぎに第１図（第２図）の回路動作について詳細に説明
する。直流給電回路１の電流出力増幅器２の出力電圧v4
を検出する電流検出器３の検出特性は抵抗R3で決まり、
そのカレント・ミラーA2を介した検出出力電流i3は次式
で与えられる。Next, the circuit operation of FIG. 1 (FIG. 2) will be described in detail. Output voltage v4 of current output amplifier 2 of DC power supply circuit 1
The detection characteristic of the current detector 3 that detects
The detected output current i3 through the current mirror A2 is given by the following equation.
i3＝u4/R3 （１） 次のカレントミラーA1は入力電流i6に比例した出力電圧
i7を出力し、この入出力の電流比を１対１とすると次の
ようになる。i3 = u4 / R3 (1) The next current mirror A1 has an output voltage proportional to the input current i6.
If i7 is output and the input / output current ratio is set to 1: 1, the result is as follows.
i7＝i6 （２） 次のローパスフイルタ４は電流入力・電流出力形で、入
力電流i1と出力電流i5の直流電流の伝達比は１で次のよ
うになる。i7 = i6 (2) The following low-pass filter 4 is a current input / current output type, and the direct current transfer ratio of the input current i1 and the output current i5 is 1 and is as follows.
i5＝i1 （３） 次の電流出力増幅器２は入力電流i5に比例した出力電流
i4を発生し、その電流増幅率Aiは次式で与えられる。i5 = i1 (3) The next current output amplifier 2 is an output current proportional to the input current i5.
i4 is generated, and its current amplification factor Ai is given by the following equation.
Ai＝i4/i5＝R5/R4 （４） ここで定電圧制御回路５を付加しない状態では次式が成
り立つ。Ai = i4 / i5 = R5 / R4 (4) Here, the following equation holds when the constant voltage control circuit 5 is not added.
i6＝i3,i1＝i7 （５） したがって（１），（２），（３），（４），（５）式
より次式のようになる。i6 = i3, i1 = i7 (5) Therefore, the following equation is obtained from the equations (1), (2), (3), (4), and (5).
i5＝i1＝i7＝i6＝i3＝v4/R3 （６） しがって（４），（６）式より次式が得られる。i5 = i1 = i7 = i6 = i3 = v4 / R3 (6) Therefore, the following equation is obtained from the equations (4) and (6).
i4＝Ai・vA/R3＝R5・v4/R4・R3 （７） よって出力インピーダンスR0は次のようになる。i4 ＝ Ai ・ vA / R3 ＝ R5 ・ v4 / R4 ・ R3 (7) Therefore, the output impedance R0 is as follows.
R0＝v4/i4＝R4・R3/R5 （８） すなわちこのときの直流給電回路１は高圧系の電源電圧
−48Vで内部抵抗R0の直流給電回路として動作する。R0 = v4 / i4 = R4.R3 / R5 (8) That is, the DC power supply circuit 1 at this time operates as a DC power supply circuit with an internal resistance R0 at a high-voltage power supply voltage of -48V.
いま定電圧制御回路５を付加すると、この定電圧制御回
路５は抵抗R1とトランジスタQ1に流れる電流i1により発
生するローパスフイルタ４の電圧降下v1を差動増幅器OP
1が検出して、この差動増幅器OP1はトランジスタQ3と抵
抗R2とトランジスタQ2に流れる電流i2により発生する電
圧v2と上記の電圧降下v1が等しくなるように電流i2を制
御する。すなわち上記の電流i1に比例した電流i2を発生
する。ここで R1＝R2 で、トランジスタQ1とQ2がペアトランジスタとしたとき
には次のようになる。Now, when the constant voltage control circuit 5 is added, the constant voltage control circuit 5 detects the voltage drop v1 of the low pass filter 4 caused by the current i1 flowing through the resistor R1 and the transistor Q1 in the differential amplifier OP.
The differential amplifier OP1 controls the current i2 so that the voltage v2 generated by the transistor Q3, the resistor R2, and the current i2 flowing through the transistor Q2 and the above voltage drop v1 become equal to each other. That is, a current i2 proportional to the above current i1 is generated. Here, when R1 = R2 and the transistors Q1 and Q2 are paired transistors,
i2＝i1 （９） このときの給電特性は次のようになる。i2 = i1 (9) The feeding characteristics at this time are as follows.
i6＝i3＋i2 （10） i7＝i1＋iN （11） したがって（10），（11），（２）式より次式のように
なる。i6 = i3 + i2 (10) i7 = i1 + iN (11) Therefore, the following equation is obtained from equations (10), (11), and (2).
i3＋i2＝i1＋iN （12） したがって（12），（１）式より次式が得られる。i3 + i2 = i1 + iN (12) Therefore, the following equation is obtained from the equations (12) and (1).
v4/R3＋i2＝i1＋iN （13） よって（13），（９）式より出力電圧v4は次のようにな
る。v4 / R3 ＋ i2 ＝ i1 ＋ iN (13) Therefore, from Eqs. (13) and (9), the output voltage v4 is as follows.
v4＝R3・iN （14） すなわち抵抗R3と定電流源iNは一定であるので出力電圧
u4も一定となり、したがって第１図（第２図）の定電圧
制御回路５を付加した直流給電回路１は定電圧（R3・iN
−48）Ｖの定電圧源として動作する。この定電圧源の内
部抵抗つまり誤差成分カレントミラーA1の比精度（電流
i6対i7）と定電圧制御回路５の入出力特性（電流i1対i
2）で決まる。v4 = R3 · iN (14) That is, the resistance R3 and the constant current source iN are constant, so the output voltage
u4 is also constant, and therefore the DC power supply circuit 1 with the constant voltage control circuit 5 in FIG. 1 (FIG. 2) added has a constant voltage (R3.iN
-48) Operates as a constant voltage source of V. The internal resistance of this constant voltage source, that is, the error component ratio accuracy of the current mirror A1 (current
i6 vs i7) and the input / output characteristics of the constant voltage control circuit 5 (current i1 vs i
Determined by 2).
以上のように本実施例によれば、既存の直流給電回路１
に簡単な定電圧制御回路５を付加することで定電圧給電
特性を得ており、定電圧給電制御の帰還ループは定電圧
制御回路５と既存のカレントミラーA1で構成していて第
１図で明らかなように抵圧系（電源電圧±5V）で動作し
ているので、このため従来例で問題点となっていた消費
電力の増大を低減して低消費電力化できる。また定電圧
給電特性の精度はカレントミラーA1の比精度が十分高け
れば定電圧制御回路５の特性が支配項となり、この定電
圧制御回路５に差動増幅器OP1を使用しているので高い
精度を得ることができる。さらに定電圧制御回路５の出
力電流i2の反転用カレントミラーとして既存のカレント
ミラーA1を併用しているので、新たにカレントミラーを
設ける必要がなくて回路の簡略化がはかれる。As described above, according to the present embodiment, the existing DC power supply circuit 1
The constant-voltage power supply characteristic is obtained by adding a simple constant-voltage control circuit 5 to the. The feedback loop of the constant-voltage power supply control is composed of the constant-voltage control circuit 5 and the existing current mirror A1. As is apparent, since the operation is performed in the low voltage system (power supply voltage ± 5 V), it is possible to reduce the increase in power consumption, which is a problem in the conventional example, and to reduce the power consumption. Further, the accuracy of the constant voltage power supply characteristic is dominated by the characteristics of the constant voltage control circuit 5 if the ratio accuracy of the current mirror A1 is sufficiently high. Since the differential amplifier OP1 is used for this constant voltage control circuit 5, high accuracy is obtained. Obtainable. Furthermore, since the existing current mirror A1 is also used as a current mirror for inverting the output current i2 of the constant voltage control circuit 5, it is not necessary to newly provide a current mirror, and the circuit can be simplified.
本発明によれば電流交換機の加入者回路の直流給電回路
において定電圧給電制御する定電圧制御回路を低圧系で
差動増幅器により構成しているため回路の低消費電力化
と簡略化がはかれ、かつ制御特性を高精度化できる効果
がある。According to the present invention, the constant voltage control circuit for controlling the constant voltage power supply in the DC power supply circuit of the subscriber circuit of the current exchange is constituted by the differential amplifier in the low voltage system, so that the power consumption of the circuit can be reduced and the circuit can be simplified. In addition, there is an effect that the control characteristics can be made highly accurate.
第１図は本発明による直流給電回路における定電圧制御
回路の一実施例を示す回路図、第２図（ａ），（ｂ）は
それぞれ第１図のカレントミラーA2,A1の内部等価回路
図である。 １…直流給電回路、２…電流出力増幅器、３…電圧検出
器、４…ローパスフイルタ、５…定電圧制御回路、OP1,
OP2…差動増幅器、A1,A2…カレントミラー、iN…定電流
源、R1〜R6…抵抗、C1…容量、Q1〜Q8…トランジスタ。FIG. 1 is a circuit diagram showing an embodiment of a constant voltage control circuit in a DC power supply circuit according to the present invention, and FIGS. 2 (a) and 2 (b) are internal equivalent circuit diagrams of the current mirrors A2 and A1 of FIG. 1, respectively. Is. 1 ... DC power supply circuit, 2 ... Current output amplifier, 3 ... Voltage detector, 4 ... Low-pass filter, 5 ... Constant voltage control circuit, OP1,
OP2 ... differential amplifier, A1, A2 ... current mirror, iN ... constant current source, R1 to R6 ... resistor, C1 ... capacitance, Q1 to Q8 ... transistor.
フロントページの続き (72)発明者 林 敏夫 神奈川県厚木市森の里若宮３番１号 日本 電信電話株式会社厚木電気通信研究所内 (72)発明者 木村 忠勝 神奈川県厚木市森の里若宮３番１号 日本 電信電話株式会社厚木電気通信研究所内Front Page Continuation (72) Inventor Toshio Hayashi 3-1, Morinosato Wakamiya, Atsugi City, Kanagawa Prefecture At Nippon Telegraph and Telephone Corporation Atsugi Telecommunications Research Laboratories (72) Inventor Tadakatsu Kimura 3-1, Morinosato Wakamiya, Atsugi City, Kanagawa Prefecture Nippon Telegraph and Telephone Corporation Company Atsugi Telecommunications Research Institute
Claims (1)
と、該電圧検出器の出力電流を反転するカレントミラー
と、該カレントミラーの出力電流の交流成分を除去する
ローパスフイルタと、該ローパスフイルタの出力電流に
より制御される直流給電電流出力増幅器よりなる直流給
電回路において、上記ローパスフイルタの電圧降下を電
圧電流変換して上記カレントミラーの入力に帰還する差
動増幅器を設け定電圧給電制御を行うように構成したこ
とを特徴とする定電圧制御回路。1. A voltage detector for detecting a DC power supply output voltage, a current mirror for inverting an output current of the voltage detector, a low-pass filter for removing an AC component of an output current of the current mirror, and the low-pass filter. In a DC power supply circuit consisting of a DC power supply current output amplifier controlled by the output current of the above, a constant voltage power supply control is performed by providing a differential amplifier for converting the voltage drop of the low pass filter into a current and converting the voltage drop to the input of the current mirror. A constant voltage control circuit having the above structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5483586A JPH0681205B2 (en) | 1986-03-14 | 1986-03-14 | Constant voltage control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5483586A JPH0681205B2 (en) | 1986-03-14 | 1986-03-14 | Constant voltage control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62213463A JPS62213463A (en) | 1987-09-19 |
| JPH0681205B2 true JPH0681205B2 (en) | 1994-10-12 |
Family
ID=12981690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5483586A Expired - Lifetime JPH0681205B2 (en) | 1986-03-14 | 1986-03-14 | Constant voltage control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0681205B2 (en) |
-
1986
- 1986-03-14 JP JP5483586A patent/JPH0681205B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62213463A (en) | 1987-09-19 |
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