KR100256562B1 - Apparatus for busy ring detection in full electronic telephone exchange - Google Patents

Abstract

PURPOSE: An apparatus for detecting ring in a full electronic telephone exchange is provided to detect a ring signal and a hook-off signal of a telephone transmitter/receiver by using a tip line and a ring line, and detect a ring without affecting a speech path voice signal or impedance through a ring detect overall circuit and using a subscriber that generates a ring in itself. CONSTITUTION: An upper processor(10) provides a ring signal through a ring line(30) to a ring detector(50), so that when a subscriber hooks off a telephone transmitter/receiver, a DC circuit detector(40) senses a hook-off signal through a channel of a tip line(20), thereby forming a speech path. The tip line(20) transmits a signal according to hook-on or hook-off to the DC circuit detector(40). The ring line(30) transmits a ring generated from the upper processor(10) to the ring detector(50). The DC circuit detector(40) senses the signal according to hook-on and hook-off of the telephone transmitter/receiver, after the speech path is formed according to ring generation. The ring detector(50) senses the ring signal generated from the upper processor(10) and detects it. A radio rectifying circuit(61) converts a (-) signal to (+) in a (+){-} AC signal to create only a (+) level of AC signal. A Zener diode circuit (62) cuts off inflow of a voice signal in the speech path and transmits the ring signal to a smoothing circuit(63). The smoothing circuit(63) delays the ring signal detected from the Zener diode circuit(62) to obtain almost a DC and transmits a ring signal with reduced ripple factor to a resistance circuit(64). The resistance circuit(64) produces a current suitable to an operation of a constant voltage circuit(65) and reduces the current amount. The constant voltage circuit(65) changes an unstable AC level signal higher than 5(V) to a stable DC level of lower than 5(V). A ring signal detector(66) detects a stable single level of ring signal transmitted through a 74LS123 circuit.

Description

Device for detecting ring during call of electronic exchange

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Full Electronic Telephone eXchange, and more particularly to a subscriber terminal capable of generating a ring on its own and a subscriber terminal circuit requiring the detection of a ring during a call. An apparatus for detecting a busy ring of an electronic exchange.

FIG. 1 is a block diagram of a tip line and a ring line for forming a currency path for a conventional electronic exchanger, and includes an upper processor 10, a tip (TIP) line 20, a ring line, and a ring line 30. And a DC circuit detector 40 and a ring detector 50.

The ring connection is made by the ring detector 50 detecting the ring 30 signal supplied by the upper processor 10.

However, after the subscriber detects the ring transmission, if the call path is formed by hooking off the handset / receiver, the DC circuit detection unit 40 detects a signal through the TIP line and blocks the ring from the call path. Since the method is used, there is a problem in that a ring detection cannot be performed during a call, so that a subscriber station that generates a ring itself cannot be used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to use a subscriber to generate a ring by itself without affecting the voice signal or impedance in the communication path of the switchboard. An apparatus for detecting a ring during a call of an electronic switch is provided.

The present invention for achieving the above object relates to an apparatus for detecting a ring during a call of an all-electronic exchange, comprising: a full-wave rectifying circuit unit configured to bridge the AC waveform to a DC waveform and transmitting a ring signal waveform; A zener diode circuit unit for receiving a ring signal waveform and using the ring signal waveform so as not to affect the voice signal during a call; A smoothing circuit section for detecting a ring signal waveform and for delaying an alternating ring signal to produce a ring signal of direct current; A constant voltage circuit section for making the unstable ring signal detection of the DC component into a stabilized ring signal detection, blocking an overvoltage detection signal, and making the unstable ring signal a high signal or a low signal of a stable single level; A ring signal detector for detecting a stable single level ring signal; It is provided with a resistance circuit portion used to create a current suitable for the operation of the constant voltage circuit portion, and to reduce the amount of current.

1 is a block diagram of a tip line and a ring line for forming a currency path for a conventional electronic exchanger,

2 is an overall block diagram of an apparatus for detecting a busy ring of an electronic switch according to the present invention;

3 is a detailed circuit diagram of the ring detection entire circuit unit shown in FIG. 2;

FIG. 4 is a diagram showing the operation of the entire ring detection circuit shown in FIG. 3; FIG.

<Explanation of symbols for main parts of drawing>

10: upper processor 20: TIP line

30: RING wire 40: DC circuit detector

50: ring detection unit 60: ring detection whole circuit unit

61: full-wave rectifying circuit portion 62: zener diode circuit portion

63: smoothing circuit portion 64: resistance circuit portion

65: constant voltage circuit 66: ring signal detector

Hereinafter, the objects and features of the present invention will be described in more detail with reference to the accompanying drawings so that the objects and features of the present invention can be more clearly understood.

Fig. 2 is a block diagram of an apparatus for detecting a busy ring of an electronic switching system according to the present invention. The upper processor 10, the tip line 20, the ring line 30, and the DC Circuit detection unit 40, ring detection unit 50, ring detection entire circuit unit 60, full-wave rectifying circuit unit 61, zener diode circuit unit 62, smoothing circuit unit 63, and resistance circuit unit 64. ), A constant voltage circuit section 65, and a ring signal detection section 66.

The upper processor 10 supplies the ring signal to the ring detector 50 through the ring line 30, and when the subscriber hooks off the handset, the DC circuit detector 40 through the TIP line 20 transmission line. ) Is a processor that detects the hook-off signal and establishes a call path.

The tip (TIP) line 20 is a line capable of transmitting signals according to the hook-on / hook-off to the DC circuit detector 40 as one of the telephone lines.

The ring line is another line required to transmit a ring generated by the upper processor 10 to the ring detector 50 as another telephone line.

The DC circuit detector 40 is a circuit for detecting and detecting a signal according to a hook-on and a hook-off after the call path is formed by ring generation.

The ring detector 50 is a circuit that detects and detects a ring signal generated by the upper processor 10.

The ring detection total circuit section 60 includes a full-wave rectifying circuit section 61, a zener diode circuit section 62, a smoothing circuit section 63, a resistance circuit section 64, a constant voltage circuit section 65, and a ring signal detection section 66. ).

The full-wave rectifier circuit 61 uses a bridge rectifier circuit, which converts a [-] signal from a [+] [-] AC signal to a [+] to make an AC signal having a [+] level and converts the DC signal into This is the part of the previous stage circuit.

The bridge rectification circuit is shown in FIG. 3, in which four diodes are bridged to act as rectifiers.

In other words, D1 and D2 rectify during the AC input [+] half cycle, and D3 and D4 rectify during the [-] half cycle, so the peak inverse voltage of each diode (Peak Inverse Voltage: below, PIV) Is abbreviated at peaks in both regions of the input signal, and transmits the output value of full-wave rectification to the zener diode circuit 62 in a circuit suitable for high voltage rectification.

Here, since PIV should be operated lower than the breakdown voltage stored in the diode, the PIV is the peak value of the voltage applied in the reverse direction when an AC voltage is applied to the rectifier.

Zener diode circuit 62 is a zener diode having a level of 12 [V] and 5 [V] breakdown. Since a voice signal in a communication path usually has a level of 5 [V], it does not affect this signal. Using a 12 [V] zener diode to detect only signals above 12 [V] and a 5 [V] zener diode to detect only signals above 5 [V] in addition to the detected signals It is a circuit for transmitting a ring signal to the smoothing circuit unit 63 by blocking the inflow of voice signals in the communication path.

In the two forms of breakdown, the first Avaranche effect is to apply a reverse bias to the diode so that the minority carriers produce very little reverse current before the diode reaches its breakdown point, while the reverse voltage exceeds the breakdown voltage. When the minority carrier has enough energy to drive away the home appliances in the orbit, the electrons out of the orbit become free electrons and drive out other home appliances so that the avalanche of the free electrons flows a very large reverse current. The second Zener effect is that when a reverse bias is applied to a diode, an electric field becomes stronger in a diode that is heavily doped with impurities between diode junctions, and when the electric field becomes stronger, a reverse electric current increases.

Smoothing circuit section 63 Condenser input type smoothing circuit, which delays the ring signal detected from the control diode circuit section 62 so as to be close to DC. Since the output of the rectifying circuit as the ring signal contains a large pulsation component, the capacitor ( By connecting a condenser, a direct current output can be made larger than a case without a capacitor, and a ring signal with a small ripple pulsation rate is transmitted to the resistance circuit section 64.

In addition, when the value of the capacitor is increased, the time constant is increased, so that the output voltage is a capacitor that allows direct access to direct current (DC).

The resistance circuit section 64 is a resistor used to create a current suitable for the operation of the constant voltage circuit section 65 and reduce the amount of current.

That is, since the resistors R1 and R2 are in parallel as shown in Fig. 3, the current is changed by the parallelized value to be suitable for the operation of the constant voltage circuit unit 65, and then transmitted.

The constant voltage circuit unit 65 makes the unstable signal of the AC level of 5 [V] or higher detected in the previous step to a stabilized DC level of 5 [V] or less to transmit the ring signal detection of DC to the upper processor 10. As a circuit for giving, it is a circuit to which the 4N28 circuit shown in FIG. 3 and a pull down circuit are applied in order to cut off the detection signal of overvoltage, reducing to DC level below 5 [V], and unstable at the end. The 74LS123 circuit shown in FIG. 3 is applied to make the signal a stable single-level high or low signal.

The ring signal detector 66 is a block that detects a secure single level ring signal transmitted through the 74LS123 circuit.

The block configuration diagram of the ring detection device during a call of the all-electronic exchange according to the present invention configured as described above has been described, and FIG. 4 illustrates an operation implementation of the entire ring detection circuit portion shown in FIG.

4A is a waveform to which a ring signal having an alternating voltage waveform having a voltage of 40 [V] to 300 [V] is input.

When the ring signal in FIG. 4A transmits a sine wave having a [+] [-] period through the full wave rectifying circuit unit 61, full wave rectification is performed as shown in FIG. 4B.

A zener diode that detects only a ring signal of 12 [V] or more through a zener diode circuit 62 in a full-wave rectified AC voltage waveform as shown in FIG. 4B is shown. FIG. 4C illustrates a zener diode of 5 [V] or more in a full-wave rectified AC voltage waveform. This waveform uses a zener diode that detects only a ring signal.

4D is an AC voltage waveform in which less than 12 [V] or 5 [V] is cut off and only 12 [V] or 5 [V] is detected so as not to affect the voice signal in the path of a call. .

4E is a waveform that is gently delayed by the capacitor in the smoothing circuit section 63. FIG.

As shown in FIG. 4F, the 4N28 and the pull down circuit shown in FIG. 3 exclude 5 [V] from the original ring signal waveform.

FIG. 4G is a waveform made by the circuit 74LS123 shown in FIG.

Therefore, since FIG. 4G maintains the low level signal on the rising edge by 74LS123 in the waveform of FIG. 4F, the state becomes high when there is no ring signal and the state of low when there is a ring signal. Therefore, the call path is connected when the transceiver is hooked off, and the ring can be detected without affecting the voice signal and the impedance.

As described above, the present invention described above detects the ring signal and the hook-off signal of the transmitter / receiver using the tip line and the ring line in the electronic switchboard, and when the call path is formed, the voice is transmitted through the ring detection whole circuit part. The effect is that the ring can be detected without affecting the signal or impedance.

Claims (6)

In the busy ring detection device of the electronic switchboard, A full-wave rectifying circuit unit configured to form an AC waveform into a DC waveform to transmit a ring signal waveform; A zener diode circuit unit for receiving the ring signal waveform and using the ring signal waveform so as not to affect the voice signal in the busy state; A smoothing circuit portion used to detect the ring signal waveform and delay the ring signal of the alternating current to make the ring signal of the direct current; A constant voltage circuit unit capable of making the unstable ring signal detection of the DC component into a stabilized ring signal detection, blocking an overvoltage detection signal, and making the unstable ring signal into a stable single level high signal or low signal; A ring signal detector for detecting the stable single level ring signal; And a resistance circuit portion used to make a current suitable for operation of the constant voltage circuit portion and to reduce the amount of current. The method of claim 1, The full wave rectifier circuit portion: The full-wave rectifier circuit portion of the full-circuit rectifier circuit is characterized in that the bridge is a full-wave rectification, characterized in that the role of full-wave rectification. The method of claim 1, The zener diode circuit portion: The zener diode circuit unit has a zener diode connected in parallel and has a breakdown level of 12 [V] and 5 [V]. The method of claim 1, The smoothing circuit unit: And said smoothing circuit is a condenser input type smoothing circuit. The method of claim 1, The resistance circuit portion: And the resistance circuit section is adapted to be suitable for the operation of the constant voltage circuit section by changing the current by two resistances in parallel and the parallel processing. The method of claim 1, The constant voltage circuit portion: The constant voltage circuit unit applies a 4N28 circuit and a pull-down circuit, and applies a 74LS123 circuit for generating a high signal or a low signal of a stable single level.

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