JPS6070866A - Power supply circuit for terminal - Google Patents
Power supply circuit for terminalInfo
- Publication number
- JPS6070866A JPS6070866A JP17799483A JP17799483A JPS6070866A JP S6070866 A JPS6070866 A JP S6070866A JP 17799483 A JP17799483 A JP 17799483A JP 17799483 A JP17799483 A JP 17799483A JP S6070866 A JPS6070866 A JP S6070866A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- capacitor
- resistor
- terminal
- supply 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
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】
本発明は、加入電話回線を利用したデータ端末装置の電
源回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply circuit for a data terminal device using a subscriber telephone line.
電話回線の加入者側に、電話機と並列にデータ端末装置
を設置して、例えば電気、ガス、水道などの自動検針を
行なうようになしたシステムが種々提案されている。こ
の場合端末装置への電源供給は、電話機とともに交換局
側からなされるのが通例である。Various systems have been proposed in which a data terminal device is installed in parallel with a telephone on the subscriber side of a telephone line to automatically read meters for electricity, gas, water, etc. In this case, power is usually supplied to the terminal device from the switching center together with the telephone.
このような電話機と並列に設置された端末装置における
最も配慮が必要な事柄として、端末装置の使用に際して
ａ詰機のベル鳴りを防止する事がある。一般に電話機が
オンフ・りされている状態では電流は流れていないが、
例えばこの状態で端末装置が駆動された場合、或いは自
動検針が終了してその駆動が解除された場合、電話回線
に電流変化が生じて電話機のベルが１，０ることかある
。このベル；ｌリシ；づ：電話回線の′直流変化が急し
ゅんなために起るものである。The most important consideration in a terminal device installed in parallel with such a telephone is to prevent the bell ringing of the a-packing machine when the terminal device is used. Generally, when the phone is turned off, no current flows, but
For example, if the terminal device is activated in this state, or if the automatic meter reading is completed and the activation is canceled, a current change may occur in the telephone line, causing the telephone to ring at 1 or 0. This bell occurs because the direct current changes in the telephone line are sudden.
このベル鳴υを防止する賠１の方法は、％願昭５６−６
２４６１号「加入１話回線の極性反転制御装置」にて述
べである如く、端末装置に供給する電源の立上り、立下
りを緩慢にする機能をもった特殊トランクを、局交換機
（・こ設けて防止する方法と、第２の方法として特願昭
５５−１２４５５６号「データ伝送方式」に述べら７ｔ
ている如く、端末装置の消費電流値をゆつく９時間をｔ
・けて立上げ、立下がシもゆっくり時間をかける方法と
これらの第１と第２の方法を併用する第３の方法とがあ
る。The first method to prevent this bell ringing is
As stated in No. 2461, "Polarity reversal control device for subscribed 1-talk line," a special trunk with the function of slowing the rise and fall of the power supplied to the terminal equipment is installed at the central office switch. 7t described in Japanese Patent Application No. 55-124556 "Data Transmission Method"
As shown in the figure, it takes 9 hours to reduce the current consumption value of the terminal device.
- There is a method that takes time to slowly start up and fall, and a third method that uses the first and second methods together.
本発明は、上記第２の方法による端末装置の電源の具体
的な回路に係わるものである。The present invention relates to a specific circuit for the power supply of a terminal device according to the second method.
第１図は従来の端末用電源回路であシ、この回路には上
記ベル鳴シの現象が生ずる懸念がある。図において、１
．２は電源入力端子であシ３．４は端末装置への定電圧
出力端子である。FIG. 1 shows a conventional terminal power supply circuit, and there is a concern that the above-mentioned ringing phenomenon may occur in this circuit. In the figure, 1
．． 2 is a power input terminal, and 3.4 is a constant voltage output terminal to the terminal device.
定電圧ダイオード５、抵抗６．７及びトランジスタ８で
定電流回路を構成して端末装置での使用電流を許容値以
内に抑え、出力端子３．４間に定電圧ダイオード９等の
定電圧素子を接続して所定の出力電圧を得る様に構成さ
れている。A constant current circuit is configured with a constant voltage diode 5, a resistor 6.7, and a transistor 8 to suppress the current used in the terminal device within the permissible value, and a constant voltage element such as a constant voltage diode 9 is connected between the output terminals 3 and 4. It is configured to connect to obtain a predetermined output voltage.
なお１０はコンデンサであり出力の定電圧を向上させる
ために接続されている。Note that 10 is a capacitor connected to improve the constant voltage of the output.
このような従来回路においては、自動検針のために入力
端子１．２に電源が投入（供給）されたり、或いは自動
検針が終了して入力端子１２への電源が遮断（供給停止
）された場合、それらに応じて直ちに動作成いは不動作
となるため、電話回線における電流変化が大きく、並列
に接続された電話機のベルが鳴る欠点があった。In such conventional circuits, when power is turned on (supplied) to input terminals 1 and 2 for automatic meter reading, or when power is cut off (supply stopped) to input terminal 12 after automatic meter reading is completed, , the operating system immediately becomes inactive in response to these changes, resulting in a large current change in the telephone line, which has the drawback of causing telephones connected in parallel to ring.
このベル鳴シの現象は、加入者に不快感を与えるもので
オシ、加入者回線を利用した端末装置にあっては是非阻
止しなければならない問題点である。This ringing phenomenon causes discomfort to subscribers, and is a problem that must be prevented in terminal devices that utilize subscriber lines.
本発明はこのような事情に鑑みて発明されたもので、上
記ベル鳴し現象を無くした端末用電源回路を提供するこ
とを目的とする。The present invention was invented in view of the above circumstances, and an object of the present invention is to provide a terminal power supply circuit that eliminates the above-mentioned ringing phenomenon.
本発明は、そのベースに定電圧ダイオード及び該定電圧
ダイオードの電流を設定する第１の抵抗が接続されたト
ランジスタを備え、上記定電圧ダイオードの他端に電源
が投入或いはその投入が停止されるようになされた電源
回路において、上記定電圧ダイオードと並列に第１のコ
ンデンサを接続するとともに、上記第１の抵抗と並列に
第２のコンデンサ及び第２の抵抗からなる直列回路を接
続して構成されたことを特徴とする。The present invention includes a transistor having a base connected to a constant voltage diode and a first resistor for setting the current of the constant voltage diode, and the other end of the constant voltage diode is turned on or turned off. In the power supply circuit configured as above, a first capacitor is connected in parallel with the voltage regulator diode, and a series circuit consisting of a second capacitor and a second resistor is connected in parallel with the first resistor. It is characterized by having been.
以下第２図に示した実施例によって本発明の詳細な説明
する。The present invention will be explained in detail below using the embodiment shown in FIG.
第２図において第１図と同一符号は同一構成要素を示し
、本発明においては、特に、定電圧ダイオード５と並列
にコンデンサ１１を接続し、また抵抗６と並列にコンデ
ンサ１２及び抵抗１３の直列回路を接続している。In FIG. 2, the same reference numerals as in FIG. Connecting the circuit.
ここでコンデンサ１１は、電源印加時に定電圧ダイオー
ド５の両端に規定の電圧が直ちに発生するのを防止する
役目を担っておシ、電源の立ち上シ動作を緩やかになす
機能を持っている。Here, the capacitor 11 has the role of preventing a specified voltage from being generated immediately across the voltage regulator diode 5 when power is applied, and has the function of slowing down the start-up operation of the power supply.
また、コンデンサ１２及び抵抗１３は、この電源回路へ
の電源供給が断たれた時に、トランジスタ８のペース電
位を極力動作状態に保つ役目を担っておシ、電源の立ち
下シ動作を緩やかになす機能を持っている。Furthermore, when the power supply to this power supply circuit is cut off, the capacitor 12 and the resistor 13 play the role of keeping the pace potential of the transistor 8 in an operating state as much as possible, and slow down the power supply. It has a function.
どのような回路構成によれば、端末装置へ電源投入がな
されても、またそれが遮断されても電話回線の電流変化
は極めて小さく抑制され、電話機のベル鳴シが阻とでき
るものである。Depending on the circuit configuration, even if the power is turned on or turned off to the terminal device, the current change in the telephone line is suppressed to an extremely small level, and the ringing of the telephone can be prevented.
以上詳しく説明したように、本発明によれば比較的簡単
な回路構成で電話機のベル鳴りが防止できるから、加入
者にとって不快感の無い端末装置を提供できるものであ
るっAs explained in detail above, according to the present invention, it is possible to prevent a telephone from ringing with a relatively simple circuit configuration, and therefore it is possible to provide a terminal device that does not cause discomfort to subscribers.
第１図は従来の端末用電源回路、第２図は本発明による
端末用電源回路の一実施例回路図である。
１．２・・電源入力端子
６．４・出力端子
５．９ 定電圧ダイオード
６．７．１５・・・抵抗
８・・トランジスタ
１１．１２・・・コンデンサ
代理人弁理士−？専−一田□オド倖′FIG. 1 is a circuit diagram of a conventional terminal power supply circuit, and FIG. 2 is a circuit diagram of an embodiment of the terminal power supply circuit according to the present invention. 1.2...Power input terminal 6.4/Output terminal 5.9 Constant voltage diode 6.7.15...Resistor 8...Transistor 11.12...Capacitor Patent attorney -? Special - Ichita Odo'
Claims (1)
の電流を設定する第１の抵抗が接続されたトランジスタ
を備え、上記定電圧ダイオードの他端に電源が投入或い
はその投入が停止されるようになされた電源回路におい
て、上記定電圧ダイオードと並列に第１のコンデンサを
接続するとともに、上記第１の抵抗と並列に第２のコン
デンサ及び第２の抵抗からなる直列回路を接続して構成
されたことを特許とする端末用電源回路。The transistor has a transistor connected to its base with a voltage regulator diode and a first resistor for setting the current of the voltage regulator diode, and the power is turned on or stopped at the other end of the voltage regulator diode. In the power supply circuit, a first capacitor is connected in parallel with the voltage regulator diode, and a series circuit consisting of a second capacitor and a second resistor is connected in parallel with the first resistor. Patented power supply circuit for terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17799483A JPS6070866A (en) | 1983-09-28 | 1983-09-28 | Power supply circuit for terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17799483A JPS6070866A (en) | 1983-09-28 | 1983-09-28 | Power supply circuit for terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6070866A true JPS6070866A (en) | 1985-04-22 |
Family
ID=16040679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17799483A Pending JPS6070866A (en) | 1983-09-28 | 1983-09-28 | Power supply circuit for terminal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6070866A (en) |
-
1983
- 1983-09-28 JP JP17799483A patent/JPS6070866A/en active Pending
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