JP2900093B2 - No-ringing incoming call detection circuit - Google Patents
No-ringing incoming call detection circuitInfo
- Publication number
- JP2900093B2 JP2900093B2 JP2501591A JP2501591A JP2900093B2 JP 2900093 B2 JP2900093 B2 JP 2900093B2 JP 2501591 A JP2501591 A JP 2501591A JP 2501591 A JP2501591 A JP 2501591A JP 2900093 B2 JP2900093 B2 JP 2900093B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- time
- ringing
- signal
- line
- 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
Description
【0001】[0001]
【産業上の利用分野】この発明は、NCU(網制御装
置)におけるノーリンギング着信検出回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-ringing incoming call detection circuit in an NCU (network control unit).
【0002】[0002]
【従来の技術】回線に対する通常の着信では極性が急激
に反転した後、16Hzの呼出信号が局より送られ来る
のに対し、ノーリンギング通信による着信では回線の極
性が緩やかに反転する。そこで、従来はノーリンギング
着信信号を次のようにして検出している。図5はかかる
従来例を示す回路図である。すなわち、回線L1,L2
をCR(C3,R6)時定数回路に接続し、抵抗R6を
流れる電流によってトランジスタTrをオンとし、負荷
抵抗R7およびフォトカプラPC2を介して応答信号
(RV/RING)を得るようにしている。2. Description of the Related Art In a normal incoming call to a line, after a sudden reversal of the polarity, a call signal of 16 Hz is sent from a station, whereas in an incoming call by no ringing communication, the polarity of the line is slowly inverted. Therefore, conventionally, a no-ringing incoming signal is detected as follows. FIG. 5 is a circuit diagram showing such a conventional example. That is, the lines L1 and L2
Is connected to a CR (C3, R6) time constant circuit, the transistor Tr is turned on by a current flowing through the resistor R6, and a response signal (RV / RING) is obtained via the load resistor R7 and the photocoupler PC2.
【0003】図5の回線反転時のタイムチャートを図6
に示す。図6(イ)に示すように、通常着信時の反転入
力時間をt1、ノーリンギング着信時の反転時間をt2
とすると、t1<<t2であるため、回線の反転信号の
時間に対する変化率dE/dtはノーリンギング着信時
には小さくなり、Trのベース電流は同図(ロ)に示す
如く通常着信時に比べて小さくなる。Trオンのための
しきい値を同図(ロ)の如くxとすると、Trのベース
電流がこのしきい値を越える期間にノーリンギング検出
信号がオンとなり、その時間幅は同図(ハ)の如くt7
である。同様に、通常検出時のそれはt6となる。図7
に16Hz着信信号入力時のタイムチャートを示す。こ
の場合もTrのベース電流がしきい値xを越えると、着
信検出信号RV/RINGがオンとなる。同図ではこの
時間は(ハ)の如くt8で示され、着信信号(16H
z)の1/2周期の30msに近い値となっている。こ
のように、従来はTrのオン時間t6,t7,t8を後
段の処理装置(CPU)等で計数してノーリンギングの
着信を示す信号t7を検出するようにしている。FIG. 6 is a time chart at the time of line reversal of FIG.
Shown in As shown in FIG. 6A, the inversion input time at the time of normal incoming call is t1, and the inversion time at the time of no ringing incoming is t2.
Then, since t1 << t2, the rate of change dE / dt of the inverted signal of the line with respect to time becomes smaller at the time of no ringing, and the base current of Tr becomes smaller than that at the time of normal incoming as shown in FIG. . Assuming that the threshold value for turning on the Tr is x as shown in FIG. 2B, the no-ringing detection signal is turned on during a period in which the base current of Tr exceeds this threshold value, and the time width thereof is as shown in FIG. Like t7
It is. Similarly, it is t6 at the time of normal detection. FIG.
Fig. 2 shows a time chart when a 16 Hz incoming signal is input. Also in this case, when the base current of Tr exceeds the threshold value x, the incoming detection signal RV / RING is turned on. In the figure, this time is indicated by t8 as shown in (c), and the incoming signal (16H
The value is close to 30 ms of a half cycle of z). As described above, conventionally, the on-time t6, t7, and t8 of the Tr is counted by the subsequent processing device (CPU) or the like, and the signal t7 indicating the arrival of no ringing is detected.
【0004】[0004]
【発明が解決しようとする課題】ノーリンギング用NC
Uを電池駆動にする場合、電池の消耗を防ぐためにはノ
ーリンギング着信以外は回路動作をしないことが望まし
い。つまり、1チップマイクロコンピュータ等からなる
ノーリンギング用NCUを、通常は低消費電力化のため
に回路はスリープ状態としノーリンギング着信を検出す
ることで動作を開始させるようにすると、図5の如き従
来の着信検出回路では通常の着信時だけでなくノーリン
ギング着信時にも検出信号を出してCPUを起動するこ
とになるため、結果として消費電力が増加してしまう。
また、図5のフォトカプラ出力に例えばRCフィルタ回
路を付加して制御回路をスリープ状態としていても、充
放電の放電期間に充電のための電流を電源(Vcc)か
ら流してしまうため、やはり無駄な電流を消費する。さ
らに、従来のような着信検出回路では、NCUの設置業
者は電話回線の極性を考慮してNCUを回線に設置しな
ければならず、作業が煩雑になるという問題もある。し
たがって、この発明の課題はノーリンギング着信信号を
安定かつ低消費電力にて検出することが可能で、かつ回
線との結線に当たって極性を考慮する必要のない検出回
路を提供することにある。SUMMARY OF THE INVENTION NC for no ringing
When U is driven by a battery, it is desirable that no circuit operation be performed except for no-ringing reception in order to prevent battery consumption. In other words, if the no-ringing NCU composed of a one-chip microcomputer or the like is normally put into a sleep state in order to reduce power consumption and the operation is started by detecting the no-ringing incoming call, the conventional incoming call as shown in FIG. The detection circuit outputs a detection signal and activates the CPU not only at the time of normal incoming call but also at the time of no ringing incoming call, resulting in an increase in power consumption.
Further, even if the control circuit is put into a sleep state by adding, for example, an RC filter circuit to the photocoupler output in FIG. 5, a current for charging flows from the power supply (Vcc) during the discharging period of charging and discharging, so that it is wasteful. High current consumption. Further, in the conventional incoming call detection circuit, the NCU installer must install the NCU on the line in consideration of the polarity of the telephone line, which causes a problem that the operation becomes complicated. Therefore, an object of the present invention is to provide a detection circuit which can detect a no-ringing incoming signal stably and with low power consumption and does not need to consider the polarity when connecting to a line.
【0005】[0005]
【課題を解決するための手段】 このような課題を解決
するため、請求項1の発明では、網制御装置のノーリン
ギング通信に用いられるノーリンギング着信検出回路に
おいて、回線電圧を整流する整流回路と、その整流電圧
で一方向に充電されるコンデンサと、このコンデンサの
両端に接続され回線電圧が所定値よりも大きいときはオ
フで回線電圧が所定値よりも低下したときにオンとなる
スイッチ素子と、このスイッチ素子を通して前記コンデ
ンサの電荷を放電する放電回路と、この放電回路の放電
電流が所定時間以上流れたときノーリンギング着信信号
を出力する信号出力回路とを設けたことを特徴としてい
る。この請求項1の発明においては、前記整流回路をツ
ェナーダイオードとダイオードからなるダイオードブリ
ッジにより構成し、回線電圧が低下したことを整流電圧
で判断可能にすることができる(請求項2の発明)。 Means for Solving the Problems] To solve such problems, the invention of claim 1, in non-ringing call detecting circuit for use in non-ringing communication network controlling device, a rectifier circuit for rectifying the line voltage, the A capacitor that is unidirectionally charged with the rectified voltage, a switch element that is connected to both ends of the capacitor and that is turned off when the line voltage is greater than a predetermined value and turned on when the line voltage falls below a predetermined value; A discharge circuit for discharging the electric charge of the capacitor through the switch element, and discharging of the discharge circuit
No-ringing incoming signal when current flows for more than a predetermined time
And a signal output circuit for outputting the same. In the invention of claim 1, the rectifier circuit is
Diode bridge consisting of an
Rectification voltage when the line voltage drops.
Can be determined (the invention of claim 2).
【0006】[0006]
【作用】 上記コンデンサの電荷をスイッチ素子を通し
て放電する放電回路と、この放電回路の放電電流が所定
時間以上流れたときノーリンギング着信信号を出力する
信号出力回路とを設けることにより、低消費電力化を図
る。また、整流回路により回線電圧を整流することによ
り、回線との結合に極性を考慮する必要をなくし、接続
作業を容易にする。The charge of the above capacitor is passed through the switch element.
Discharge circuit and discharge current of the discharge circuit is predetermined.
Output a no-ringing incoming signal when flowing for more than time
By providing the signal output circuit , low power consumption is achieved. Further, by rectifying the line voltage by the rectifier circuit, it is not necessary to consider the polarity in coupling with the line, thereby facilitating the connection operation.
【0007】[0007]
【実施例】図1はこの発明の実施例を示す回路図であ
る。同図において、D7はダイオード、FETは電界効
果トランジスタ、C1はコンデンサで、常時はFETを
オフとしておき、ダイオードD7を介してコンデンサC
1に電荷を蓄積しておく。また、通常着信の回線の急反
転時にはRV/RING信号を出力しないようにするた
め、抵抗R4とコンデンサC2からなるフィルタを設け
ておく。回線からの着信入力はダイオードD1〜D4と
ツェナーダイオードD5,D6によるダイオードブリッ
ジ回路で検出され、常時は線間の電位差がツェナーダイ
オードの逆電圧Vzを越えるように設定されているの
で、ブリッジ回路の出力VoutはVin−Vzとなっ
ている。そして、通常着信またはノーリンギング着信に
より回線の電位差がツェナー電圧Vzよりも小さくなる
と、Voutは0となる。そうすると、FETはそのソ
ース電位よりもゲート電位の方が低くなるため、常時は
オフとなっていたFETがオンとなり、コンデンサC1
に蓄えられていた電荷が抵抗R3を通してフォトカプラ
PC1に与えられ、フォトカプラPC1にコレクタ電流
が流れる。なお、図1のダイオードブリッジ回路は図2
のように構成しても、機能,作用に変わりはない。な
お、D8はツェナーダイオードである。FIG. 1 is a circuit diagram showing an embodiment of the present invention. In the figure, D7 is a diode, FET is a field-effect transistor, and C1 is a capacitor. The FET is normally turned off, and a capacitor C is connected via a diode D7.
The electric charge is stored in 1. In addition, a filter including a resistor R4 and a capacitor C2 is provided so as not to output the RV / RING signal when the line of the normal incoming call is suddenly inverted. The incoming input from the line is detected by a diode bridge circuit composed of diodes D1 to D4 and zener diodes D5 and D6, and the potential difference between the lines is always set to exceed the reverse voltage Vz of the zener diode. The output Vout is Vin-Vz. Then, when the potential difference of the line becomes smaller than the zener voltage Vz due to normal incoming or no ringing incoming, Vout becomes 0. Then, since the gate potential of the FET is lower than its source potential, the FET which has been normally off is turned on and the capacitor C1 is turned on.
Is supplied to the photocoupler PC1 through the resistor R3, and a collector current flows through the photocoupler PC1. Note that the diode bridge circuit of FIG.
Even if it constitutes like, there is no change in a function and an operation. D8 is a Zener diode.
【0008】従って、通常着信の回線の急反転時には、
その急反転時間t1を約20msecとして、その間に
信号RV/RINGが次段の制御回路のスレッシュホー
ルドレベルを越えないようにR4とC2の時定数を予め
選定しておくことにより、図3(ホ)の点線のように無
視することができる。また、急反転した後は図4(イ)
のように16Hzの着信信号が入力される。この着信信
号に対しては図4(ロ)に示すように、回線の電位差が
Vz以下のときだけVoutは0となる。このとき、コ
ンデンサC1の充放電を行なう抵抗R2,R3との比を
例えば100:1としておくと、i1による充電時間
(常時)は長く、i2による放電時間(着信時)は短く
なるため、16Hz着信がしばらく続くとコンデンサC
1の電荷は図4(ハ)のように無くなり、充電電圧Vc
は0ボルト近くまで低下する。これにより、着信中であ
ってもフォトカプラPC1には電流が流れないため、こ
の場合も図4(ニ)の点線のように無視することが可能
となり、低消費電力化を図ることができる。Therefore, at the time of sudden reversal of the line of the normal incoming call,
By setting the time constant of R4 and C2 in advance so that the rapid inversion time t1 is about 20 msec and the signal RV / RING does not exceed the threshold level of the control circuit of the next stage during that time, FIG. ) Can be ignored as shown by the dotted line. Also, after a sudden reversal, FIG.
The incoming signal of 16 Hz is input as shown in FIG. For this incoming signal, as shown in FIG. 4B, Vout becomes 0 only when the line potential difference is equal to or less than Vz. At this time, if the ratio between the resistors R2 and R3 for charging and discharging the capacitor C1 is set to, for example, 100: 1, the charging time by i1 (always) is long, and the discharging time by i2 (at the time of incoming call) becomes short. If incoming call continues for a while, capacitor C
1 disappears as shown in FIG. 4C, and the charge voltage Vc
Drops to near 0 volts. As a result, current does not flow through the photocoupler PC1 even during an incoming call, so that even in this case, the current can be ignored as indicated by the dotted line in FIG. 4D, and power consumption can be reduced.
【0009】これに対し、ノーリンギング着信時の回線
の信号は図3(イ)にt2(1.5sec程度)で示す
ように緩やかに反転するので、Voutの幅も約1se
c程度となるようツェナー電圧Vzを選定する。そし
て、C1とR3の時定数で決まる、フォトカプラPC1
に電流を流す時間を、通常着信のフィルタリングを行な
うR4とC2の時定数で決まるフィルタ時間t5よりも
大きく選定しておけば、図3(ホ)に示すように、ノー
リンギング着信時にはt5(R4とC2でフィルタが掛
かった時間)だけ短くなるものの、パルス幅t4のノー
リンギング着信信号として検出されることになる。この
t4のパルス幅信号により、後段の制御回路はスリープ
状態から起き出し、ノーリンギング着信処理を行なう。On the other hand, the signal on the line at the time of no-ringing reception is gently inverted as shown by t2 (about 1.5 sec) in FIG. 3A, so that the width of Vout is also about 1 sec.
The zener voltage Vz is selected so as to be about c. The photocoupler PC1 is determined by the time constant of C1 and R3.
Is selected to be longer than the filter time t5 determined by the time constants of R4 and C2 for filtering the normal incoming call, as shown in FIG. 3 (e), t5 (R4 and Although the time is shortened by the time during which the filter is applied at C2), the signal is detected as a no-ringing incoming signal having a pulse width t4. By the pulse width signal at t4, the control circuit at the subsequent stage wakes up from the sleep state and performs the no-ringing incoming process.
【0010】[0010]
【発明の効果】この発明によれば、NCUの制御回路
(1チップマイクロコンピュータ等)に与えられる着信
信号はノーリンギング着信信号のみとなり、通常着信の
ときは上記制御回路をスリープ状態のままにしておくこ
とができるので、バッテリの消耗を防ぐことが可能とな
る。また、バッテリは電子部品の中でも比較的大きな割
合を占めるので、消費電力の低減によりバッテリ容量の
小さな部品を用いることができ小形化,低コスト化を図
ることが可能となる。また、整流回路を設けて回線とN
CUとの結線が無極性でできるようにしたので、配線工
事の際の接続誤りも無くなるだけでなく、極性判定も不
要となり、配線の省力化を図ることが可能となる。According to the present invention, the incoming signal supplied to the control circuit of the NCU (such as a one-chip microcomputer) is only a no-ringing incoming signal, and the control circuit is kept in a sleep state during a normal incoming call. Therefore, battery consumption can be prevented. In addition, since the battery occupies a relatively large proportion of the electronic components, it is possible to use a component having a small battery capacity by reducing the power consumption, and it is possible to reduce the size and cost. In addition, a rectifier circuit is provided to
Since the connection with the CU can be made in a non-polar manner, not only is there no connection error at the time of wiring work, but also the polarity judgment becomes unnecessary, and it is possible to save labor of wiring.
【図1】この発明の実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図2】図1のダイオードブリッジ回路の変形例を示す
回路図である。FIG. 2 is a circuit diagram showing a modification of the diode bridge circuit of FIG.
【図3】図1の反転信号入力時の動作を説明するための
タイムチャートである。FIG. 3 is a time chart for explaining an operation when an inverted signal of FIG. 1 is input;
【図4】図1における16Hz着信信号受信時の動作を
説明するためのタイムチャートである。FIG. 4 is a time chart for explaining an operation at the time of receiving a 16-Hz incoming signal in FIG. 1;
【図5】従来例を示す回路図である。FIG. 5 is a circuit diagram showing a conventional example.
【図6】図5の反転信号入力時の動作を説明するための
タイムチャートである。6 is a time chart for explaining an operation at the time of inputting an inverted signal of FIG. 5;
【図7】図5における16Hz着信信号受信時の動作を
説明するためのタイムチャートである。FIG. 7 is a time chart for explaining an operation at the time of receiving a 16-Hz incoming signal in FIG. 5;
L1 回線信号端 L2 回線信号端 R1 抵抗 R2 抵抗 R3 抵抗 R4 抵抗 R5 抵抗 C1 コンデンサ C2 コンデンサ D1 ダイオード D2 ダイオード D3 ダイオード D4 ダイオード D5 ツェナーダイオード D6 ツェナーダイオード D7 ダイオード D8 ツェナーダイオード PC1 フォトカプラ FET 電界効果トランジスタ L1 Line signal end L2 Line signal end R1 Resistance R2 Resistance R3 Resistance R4 Resistance R5 Resistance C1 Capacitor C2 Capacitor D1 Diode D2 Diode D3 Diode D4 Diode D5 Zener Diode D6 Zener Diode D7 Diode D8 Zener Diode PC1 Photocoupler FET
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) H04M 11/00 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 6 , DB name) H04M 11/00
Claims (2)
られるノーリンギング着信検出回路において、 回線電圧を整流する整流回路と、その整流電圧で一方向
に充電されるコンデンサと、このコンデンサの両端に接
続され回線電圧が所定値よりも大きいときはオフで回線
電圧が所定値よりも低下したときにオンとなるスイッチ
素子と、このスイッチ素子を通して前記コンデンサの電
荷を放電する放電回路と、この放電回路の放電電流が所
定時間以上流れたときノーリンギング着信信号を出力す
る信号出力回路とを設けたことを特徴とするノーリンギ
ング着信検出回路。1. A no-ringing incoming detection circuit used for no-ringing communication of a network control device, comprising: a rectifier circuit for rectifying a line voltage; a capacitor charged unidirectionally with the rectified voltage; and a line connected to both ends of the capacitor. A switching element that is turned off when the voltage is larger than a predetermined value and turned on when the line voltage falls below a predetermined value; a discharging circuit that discharges the charge of the capacitor through the switching element; and a discharging current of the discharging circuit. Place
Outputs no ringing incoming signal when flowing for more than a fixed time
And a signal output circuit.
イオードからなるダイオードブリッジにより構成し、回
線電圧が低下したことを整流電圧で判断可能にしてなる
ことを特徴とする請求項1に記載のノーリンギング着信
検出回路。2. The no-ringing incoming detection according to claim 1, wherein the rectifier circuit is constituted by a diode bridge composed of a Zener diode and a diode, so that it is possible to judge from the rectified voltage that the line voltage has dropped. circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2501591A JP2900093B2 (en) | 1991-01-28 | 1991-01-28 | No-ringing incoming call detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2501591A JP2900093B2 (en) | 1991-01-28 | 1991-01-28 | No-ringing incoming call detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04252554A JPH04252554A (en) | 1992-09-08 |
JP2900093B2 true JP2900093B2 (en) | 1999-06-02 |
Family
ID=12154090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2501591A Expired - Lifetime JP2900093B2 (en) | 1991-01-28 | 1991-01-28 | No-ringing incoming call detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2900093B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3599503B2 (en) * | 1996-11-25 | 2004-12-08 | 沖電気工業株式会社 | High voltage detection circuit, bell signal detection circuit, and no ringing incoming detection circuit |
-
1991
- 1991-01-28 JP JP2501591A patent/JP2900093B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04252554A (en) | 1992-09-08 |
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