JP2894887B2 - Telephone power supply circuit - Google Patents
Telephone power supply circuitInfo
- Publication number
- JP2894887B2 JP2894887B2 JP4026127A JP2612792A JP2894887B2 JP 2894887 B2 JP2894887 B2 JP 2894887B2 JP 4026127 A JP4026127 A JP 4026127A JP 2612792 A JP2612792 A JP 2612792A JP 2894887 B2 JP2894887 B2 JP 2894887B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- constant current
- power supply
- resistor
- telephone
- 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 - Fee Related
Links
Landscapes
- Devices For Supply Of Signal Current (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は電話機給電回路に関し、
特に、電話機に電源を供給するために定電流回路を用い
て交流バランス結合をした電話機給電回路に関する。BACKGROUND OF THE INVENTION The present invention relates to a telephone power supply circuit.
In particular, the present invention relates to a telephone power supply circuit in which AC balance coupling is performed using a constant current circuit to supply power to the telephone.
【０００２】[0002]
【従来の技術】従来、この種の電話機給電回路は、図２
の回路図に示すように第一の定電流回路１、第二の定電
流回路２、第一の抵抗器３、第二の抵抗器４、第一のコ
ンデンサ５、第二のコンデンサ９、電源６、電流調整回
路８及び電話機回路７で構成されていた。ここで、定電
流回路は、電圧が変化しても電流が変化しないようにす
るため、交流に対するインピーダンス（抵抗）を基本的
に高くしてある。2. Description of the Related Art Conventionally, this kind of telephone power supply circuit is shown in FIG.
As shown in the circuit diagram, a first constant current circuit 1, a second constant current circuit 2, a first resistor 3, a second resistor 4, a first capacitor 5, a second capacitor 9, a power supply 6, the current adjusting circuit 8 and the telephone circuit 7. Here, the constant current circuit basically has a high impedance (resistance) with respect to AC in order to prevent the current from changing even when the voltage changes.
【０００３】上記従来の電話機給電回路においては、交
流バランスを崩さないようにする目的で、二つの定電流
回路１，２にかかる電圧が、それぞれゼロにならないよ
うにするために、電流値を調整する電流調整回路８が必
要であった。In the conventional telephone power supply circuit, the current value is adjusted so that the voltage applied to the two constant current circuits 1 and 2 does not become zero in order to prevent the AC balance from being lost. A current adjustment circuit 8 to perform the adjustment was necessary.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら上述した
従来の電話機給電回路は、電流調整回路が必要なため、
回路が複雑かつ、高価になるという問題がある。However, the above-described conventional telephone power supply circuit requires a current adjusting circuit.
There is a problem that the circuit is complicated and expensive.
【０００５】本発明は上述した問題点にかんがみてなさ
れたものであり、回路の簡略化および低価格を図ること
のできる電話機給電回路の提供を目的とする。The present invention has been made in view of the above-described problems, and has as its object to provide a telephone power supply circuit capable of simplifying the circuit and reducing the cost.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に本発明の電話機給電回路は、第一の定電流回路と、第
二の定電流回路と、第一の抵抗器と、第二の抵抗器と、
コンデンサと、電源と、電話機回路を有する電話機給電
回路において、第一の定電流回路の片端に電源の陽極を
接続し、前記第一の定電流回路の他端に、第一の抵抗器
および電話機回路の片端を並列に接続し、前記第一の抵
抗器の他端にコンデンサの片端を接続し、前記電話機回
路の他端に、第二の定電流回路の片端および第二の抵抗
器の片端を並列に接続し、前記コンデンサの他端、前記
第二の定電流回路の他端および前記第二の抵抗器の他端
を前記電源の陰極にそれぞれ接続し、かつ、前記第一の
定電流回路の電流値および前記第二の定電流回路の電流
値を共にゼロより大きな値に設定するとともに、前記第
一の定電流回路の電流値を前記第二の定電流回路の電流
値より大きな値に設定し、さらに、前記電源の電圧を前
記第二の抵抗器にかかる電圧と電話機回路にかかる電圧
との和の値よりも大きな値に設定した構成としてある。
また、好ましくは、前記第一の抵抗器の抵抗値と前記第
二の抵抗器の抵抗値を同一の値に設定した構成としてあ
る。To achieve the above object, a telephone power supply circuit according to the present invention comprises a first constant current circuit, a second constant current circuit, a first resistor, and a second constant current circuit. Resistors and
In a telephone power supply circuit having a capacitor, a power supply, and a telephone circuit, an anode of a power supply is connected to one end of a first constant current circuit, and a first resistor and a telephone are connected to the other end of the first constant current circuit. One end of a circuit is connected in parallel, one end of a capacitor is connected to the other end of the first resistor, and one end of a second constant current circuit and one end of a second resistor are connected to the other end of the telephone circuit. Are connected in parallel, the other end of the capacitor, the other end of the second constant current circuit and the other end of the second resistor are connected to the cathode of the power supply, respectively , and the first constant current and sets the current value and both a value greater than zero the current value of the second constant current circuit of the circuit, the first value larger than the current value of the second constant current circuit a current value of the constant current circuit set, further, before the voltage of the power supply
Serial are a configuration set to a value greater than the value of the sum of the voltage applied to the second resistor in such a voltage and the telephone circuit.
Also, preferably, there a resistance value of the second resistor and the resistance value of the first resistor as a set at the same value.
【０００７】[0007]
【実施例】以下、本発明の一実施例について、図面を参
照して説明する。図１は、本発明の一実施例に係る電話
機給電回路を示す回路図である。図１において、１は第
一の定電流回路、２は第二の定電流回路、３は第一の抵
抗器、４は第二の抵抗器、５はコンデンサ、６は電源、
７は電話機回路である。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a telephone power supply circuit according to one embodiment of the present invention. In FIG. 1, 1 is a first constant current circuit, 2 is a second constant current circuit, 3 is a first resistor, 4 is a second resistor, 5 is a capacitor, 6 is a power supply,
7 is a telephone circuit.
【０００８】第一の定電流回路１の片端は電源６の陽極
と接続してある。第一の定電流回路１の他端は、第一の
抵抗器３および電話機回路７の片端とそれぞれ接続して
ある。第一の抵抗器３の他端はコンデンサ５の片端と接
続してある。電話機回路７の他端は、第二の定電流回路
２の片端および第二の抵抗器４の片端とそれぞれ接続し
てある。コンデンサ５の他端、第二の定電流回路２の他
端および第二の抵抗器４の他端は、電源６の陰極にそれ
ぞれ接続してある。One end of the first constant current circuit 1 is connected to the anode of the power supply 6. The other end of the first constant current circuit 1 is connected to one end of the first resistor 3 and one end of the telephone circuit 7, respectively. The other end of the first resistor 3 is connected to one end of the capacitor 5. The other end of the telephone circuit 7 is connected to one end of the second constant current circuit 2 and one end of the second resistor 4, respectively. The other end of the capacitor 5, the other end of the second constant current circuit 2, and the other end of the second resistor 4 are connected to the cathode of the power supply 6, respectively.
【０００９】上記本発明の電話機給電回路においては、
第一の定電流回路の電流値をＩ１、第二の定電流回路２
の電流値をＩ２としたとき、 ０＜Ｉ２＜Ｉ１ となるように設定する。したがって、第二の抵抗器４を
流れる電流をＩ３とすると、 Ｉ１＝Ｉ２＋Ｉ３ Ｉ３＝Ｉ１−Ｉ２＞０ となり、Ｉ３はＩ１とＩ２が一定なので、やはり一定と
なる。第二の抵抗器４の抵抗値をＲ２、第二の抵抗器４
にかかる電圧をＶ２とすると、 Ｖ２＝Ｒ２×Ｉ３＞０ となり、Ｒ２，Ｉ３が一定であるので、Ｖ２も一定の値
となる。第二の抵抗器４にかかる電圧と、第二の定電流
回路２にかかる電流は同じなので、第二の定電流回路２
にかかる電圧は、一定の値をとるため０にはならない。In the telephone power supply circuit of the present invention,
The current value of the first constant current circuit is I1, the second constant current circuit 2 is
Is set so that 0 <I2 <I1 when the current value of I2 is I2. Therefore, assuming that the current flowing through the second resistor 4 is I3, I1 = I2 + I3 I3 = I1-I2> 0, and I3 is also constant because I1 and I2 are constant. The resistance value of the second resistor 4 is R2,
Assuming that the voltage applied to is V2, V2 = R2 × I3> 0, and since R2 and I3 are constant, V2 also has a constant value. Since the voltage applied to the second resistor 4 and the current applied to the second constant current circuit 2 are the same, the second constant current circuit 2
Does not become 0 because it takes a constant value.
【００１０】次に、電話機回路７の直流抵抗をＲ３、電
話機回路７にかかる電圧をＶ３とすると、 Ｖ３＝Ｒ３×Ｉ１ である。電源６の電圧をＶ４とし、あらかじめ Ｖ４＞Ｖ２＋Ｖ３ となるように電源６の電圧を設定しておけば、第一の定
電流回路１にかかる電圧Ｖ１は、 Ｖ１＝Ｖ４−（Ｖ２＋Ｖ３）＞０ となり、常に０以上となる。Next, assuming that the DC resistance of the telephone circuit 7 is R3 and the voltage applied to the telephone circuit 7 is V3, V3 = R3 × I1. If the voltage of the power supply 6 is set to V4 and the voltage of the power supply 6 is set in advance so that V4> V2 + V3, the voltage V1 applied to the first constant current circuit 1 becomes V1 = V4- (V2 + V3)> 0. , Is always 0 or more.
【００１１】上述したように、本発明の電話機給電回路
においては、第一の定電流回路１と、第二の定電流回路
２にかかる電圧は、電流調整回路が無くても常に０より
大である。一般に電子回路で定電流回路を構成した場
合、定電流回路の両端にかかる電圧が０ないし０近くに
なると、動作がうまくいかず、定電流特性を維持できな
くなり、インピーダンスが下がってしまう。しかし、本
発明の電話機給電回路においては、二つの定電流回路に
かかる電圧が常に０より大であるため、二つの定電流回
路は、飽和して（電圧が０近くになって）交流インピー
ダンス（交流に対するインピーダンス）が下がることな
く、常に第一の抵抗器および第二の抵抗器に対して、十
分高い交流インピーダンスを持つことができる。As described above, in the telephone power supply circuit of the present invention, the voltage applied to the first constant current circuit 1 and the second constant current circuit 2 is always greater than 0 even without the current adjusting circuit. is there. In general, when a constant current circuit is configured by an electronic circuit, if the voltage applied to both ends of the constant current circuit becomes 0 or close to 0, the operation does not work well, the constant current characteristic cannot be maintained, and the impedance decreases. However, in the telephone power supply circuit of the present invention, since the voltage applied to the two constant current circuits is always greater than 0, the two constant current circuits are saturated (the voltage becomes close to 0) and the AC impedance ( It is possible to always have a sufficiently high AC impedance with respect to the first resistor and the second resistor without lowering the AC impedance.
【００１２】また、第一の抵抗器３の抵抗値をＲ１と
し、 Ｒ１＝Ｒ２ に設定すれば、電話機回路７からみた交流インピーダン
スは、両端子間とも、Ｒ１およびＲ２があるようにみえ
るだけになるため、交流バランスをとることができる。If the resistance of the first resistor 3 is R1 and R1 = R2, the AC impedance viewed from the telephone circuit 7 is such that R1 and R2 appear between both terminals. Therefore, it is possible to balance the exchange.
【００１３】[0013]
【発明の効果】以上説明したように、本発明の電話機給
電回路によれば電流調整回路がなくても、二つの定電流
回路にかかる電圧を常に０より大に設定できるため、回
路を簡略化することができる。As described above, according to the telephone power supply circuit of the present invention, the voltage applied to the two constant current circuits can always be set to be larger than 0 even without the current adjusting circuit, so that the circuit is simplified. can do.
【図１】本発明の電話機給電回路の一実施例を示す回路
図である。FIG. 1 is a circuit diagram showing one embodiment of a telephone power supply circuit of the present invention.
【図２】従来の電話機給電回路を示す回路図である。FIG. 2 is a circuit diagram showing a conventional telephone power supply circuit.
１…第一の定電流回路 ２…第二の定電流回路 ３…第一の抵抗器 ４…第二の抵抗器 ５…第一のコンデンサ ６…電源 ７…電話機回路 DESCRIPTION OF SYMBOLS 1 ... 1st constant current circuit 2 ... 2nd constant current circuit 3 ... 1st resistor 4 ... 2nd resistor 5 ... 1st capacitor 6 ... Power supply 7 ... Telephone circuit
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H04M 19/00 - 19/08 H04M 1/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) H04M 19/00-19/08 H04M 1/00
Claims (2)
と、第一の抵抗器と、第二の抵抗器と、コンデンサと、
電源と、電話機回路を有する電話機給電回路において、 第一の定電流回路の片端に電源の陽極を接続し、前記第
一の定電流回路の他端に、第一の抵抗器および電話機回
路の片端を並列に接続し、前記第一の抵抗器の他端にコ
ンデンサの片端を接続し、前記電話機回路の他端に、第
二の定電流回路の片端および第二の抵抗器の片端を並列
に接続し、前記コンデンサの他端、前記第二の定電流回
路の他端および前記第二の抵抗器の他端を前記電源の陰
極にそれぞれ接続し、 かつ、前記第一の定電流回路の電流値および前記第二の
定電流回路の電流値を共にゼロより大きな値に設定する
とともに、前記第一の定電流回路の電流値を前記第二の
定電流回路の電流値より大きな値に設定し、 さらに、前記電源の電圧を、前記第二の抵抗器にかかる
電圧と前記電話機回路にかかる電圧との和の値よりも大
きな値に設定したことを特徴とする 電話機給電回路。1. A first constant current circuit, a second constant current circuit, a first resistor, a second resistor, a capacitor,
In a telephone power supply circuit having a power supply and a telephone circuit, an anode of a power supply is connected to one end of a first constant current circuit, and a first resistor and one end of a telephone circuit are connected to the other end of the first constant current circuit. Are connected in parallel, one end of a capacitor is connected to the other end of the first resistor, and one end of a second constant current circuit and one end of a second resistor are connected in parallel to the other end of the telephone circuit. Connected, the other end of the capacitor, the other end of the second constant current circuit and the other end of the second resistor respectively connected to the cathode of the power supply , and the current of the first constant current circuit Value and said second
Set both current values of the constant current circuit to a value greater than zero
Along with the current value of the first constant current circuit,
Set to a value greater than the current value of the constant current circuit, and further apply the voltage of the power supply to the second resistor
Greater than the sum of the voltage and the voltage applied to the telephone circuit.
A telephone power supply circuit characterized in that the value is set to a suitable value .
抵抗器の抵抗値を同一の値に設定したことを特徴とする
請求項１記載の電話機給電回路。 2. A telephone feeding circuit according to claim 1, characterized in that setting the resistance value of the second resistor and the resistance value of the first resistor to the same value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4026127A JP2894887B2 (en) | 1992-01-17 | 1992-01-17 | Telephone power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4026127A JP2894887B2 (en) | 1992-01-17 | 1992-01-17 | Telephone power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05199335A JPH05199335A (en) | 1993-08-06 |
| JP2894887B2 true JP2894887B2 (en) | 1999-05-24 |
Family
ID=12184903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4026127A Expired - Fee Related JP2894887B2 (en) | 1992-01-17 | 1992-01-17 | Telephone power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2894887B2 (en) |
-
1992
- 1992-01-17 JP JP4026127A patent/JP2894887B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05199335A (en) | 1993-08-06 |
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