KR920006758Y1 - Permanent off-hook preventing circuit - Google Patents

Abstract

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Description

Off-hook telephone automatic recovery circuit

1 is a block diagram of an automatic recovery circuit of the off-hook telephone of the present invention.

2 is a detailed circuit diagram of FIG.

* Explanation of symbols for main parts of the drawings

10: telephone line 20: ring circuit

30: call circuit 40: tone detection circuit

50: timer circuit 60: control circuit

70: drive circuit 80: power circuit

T: Trans SCR: Thyristor

RY ₁ : Relay contact RY: Relay

HS ₁ HS ₂ : Interlocking hook switch TLD: Diaak

F ₁ : dial tone detection unit F2: midtone tone detection unit

Q ₁ , Q ₂ : Transistor PUT: Programmable UJT

La, Lb: Telephone line Nicd: Rechargeable battery

Va: power

The present invention relates to an automatic recovery circuit for an unused off-hook telephone which enables a caller to smoothly receive a call by automatically recovering a non-used off-hook telephone to an on-hook status. .

In the conventional telephone, when the telephone is in an off-hook state due to a mistake or negligence of a telephone user, the telephone station detects that the telephone is off-hook in the exchange of the telephone station, but restores the line path when the off-hook state persists for a long time. Various embarrassment cases have often occurred between the caller and the callee, and even the most versatile and versatile phones become obsolete when they become unused off-hook.

In other words, the conventional telephone is not able to receive the caller due to the wrong handset or wrongly picked up by the user's mistake or carelessness.

The present invention automatically recovers an unused off-hook state (the handset is off the phone) to the on-hook state (the handset is on the phone) so that the caller rings on the caller's call. When the reception of the present invention to be described in detail according to the accompanying drawings to facilitate the reception as follows.

1 is a block diagram of an automatic recovery circuit of an unused off-hook telephone. As shown therein, a bell circuit 20 is connected to a telephone line 10 between the bell circuit 20 and a call circuit 30. The relay contact RY ₁ and the interlocking hook switch HS ₁ are connected in series, and the secondary side of which the primary side of the transformer T is connected to the bell circuit 20 and the call circuit 30 in parallel is To the tone detection circuit 40, the tone detection circuit 40 is connected to the timer circuit 50 and the control circuit 60, the timer circuit 50 to the control circuit 60 and the control circuit 60 is connected to the drive circuit 70, the drive circuit 70 is configured by connecting to the power supply circuit 80 through the interlocking hook switch (HS ₂ ).

Therefore, FIG. 2 shows the internal circuit of FIG. 1 of the detailed circuit diagram of FIG. 1 as follows.

The tone detection circuit 40 is composed of a dial tone detection unit F ₁ and a double tone tone detection unit F ₂ , and the timer circuit 50 includes resistors R ₂ , R ₃ , R ₄ , and a capacitor. (C ₁ ), PUT, the control circuit 60 is composed of transistors (Q ₁ ), (Q ₂ ), resistor (R ₅ ), (R ₆ ), diode (D ₂ ), (D ₃ ) do.

In addition, the driving circuit 70 includes a capacitor C ₂ , a resistor R ₇ , a thyristor SCR, a relay RY, a diode D ₄ , and the power supply circuit 80 includes a rechargeable battery ( Nicd, a diode D ₁ , a resistor R ₁ , and a power supply Va.

When described in detail according to the drawings the working effect of the present invention configured as described above as follows.

First, when the user tries to make a call or unintentionally the phone is off-hook, the interlocking hook switch (HS ₁ ), (HS ₂ ) is turned ON and the power supply (Va) is turned on. hook switch (HS _1), power source (Va) is supplied to each circuit via (HS ₂₎ being each circuit starts an operation.

At this time, the thyristor SCR in the driving circuit 70 is in a non-conductive state, and thus the relay contact RY ₁ remains in an ON state because the relay RY is also in a non-conductive state.

Then, when off-hook from the telephone connected to the telephone line, the high and low state of electric potential is changed at the test point of the subscriber line, and by detecting the line tester of the local telephone exchange, the exchange connects the line path between the off-hook subscriber and the exchange. Dial tone and dialing is followed by a call.

If dialing is not done by the telephone station during dial tone transmission, the telephone line will be sent for a few seconds, and then the connected line path will be restored, or if the caller and the called party end the call and put the wrong handset on the phone. If it is not put up, after a certain time, the telephone exchange will send out the busy tone for a few seconds and then restore the connected line.

In this way, the dial tone and the ohmtone transmitted from the telephone exchange are diverted to the primary side and the secondary side of the transformer T connected in parallel to the interlocking hook switch HS ₁ and the call circuit 30. The tone tone detection unit F _{1 in} 40 is output, and therefore the tone tone tone is output to the tone tone tone detection unit F ₂ .

The dial tone output to the dial tone detector F ₁ is applied to the base of the transistor Q ₂ through the resistor R ₅ in the control circuit 60 to conduct the transistor Q ₂ and at the same time, the transistor Q ₁ ) is applied to the collector side.

At the same time, the dial tone is divided by the resistors R ₂ and R ₃ in the timer circuit 50 so that the divided voltage is applied to the gate of the PUT, and the resistor C ₄ is applied to the capacitor C ₁ through the resistor R ₄ . Is charged.

At this time, after charging for a certain time by the time constant (t) (t = R ₄ × C ₁ ), after a certain time, the voltage charged in the capacitor (C ₁ ) is again converted by the resistor (R ₂ ), (R ₃ ) is divided is higher than the voltage applied to the gate of the PUT is PUT conduction by applying a divided voltage to a base side of the transistor (Q ₁₎ thereby interconnecting the transistor (Q _1).

At this time, the voltage applied to the collector side of the transistor Q ₁ is triggered to the gate of the thyristor SCR through the emitter side, the diode D ₂ , the capacitor C ₂ , and the resistor R ₇ . The Lister SCR is turned on.

Meanwhile, during which the number (t) the time constant is dropped by adjusting the amount of time before or Huazhong omton is transmitted when it is not the dial within a specified time by sending a dial tone from the central office switch, the transistor (Q ₂₎ timer operation It causes the output to a resistance (R ₆₎ and the diode diode Huazhong omton no japom the japom of Huazhong omton outputted through (D ₃₎ to by-pass (D _3).

In the timer circuit 50, the timer circuit 50 operates from the moment when the telephone is off-hook and the output of the dial tone detection unit F ₁ appears. When the dial tone is interrupted by dialing or the tone tone is changed, the dial tone detection unit ( The output of F ₁ ) is cut off and the timer circuit 50 is stopped.

When the timer circuit 50 is stopped in this way, the voltage charged in the capacitor C1 is discharged.

In this way, since the time constant t is dialed in time or is hooked before the busy ohm is dispatched, the busy tone output and the dial tone output are not duplicated.

That is, when the busy tone is output, the output of the dial tone is blocked by the timer circuit 50 so that the output is not duplicated.

In this way, after a predetermined time after the output of the dial tone detected by the dial tone detection unit F ₁ is output, the mid-tone tone detected by the mid-tone tone detector F ₂ is again the resistance R ₆ , the diode D ₃ , and the capacitor C. ₂ ), a trigger is applied to the gate of the thyristor SCR through the resistor R ₇ so that the thyristor SCR is turned on.

When the thyristor SCR is turned on, the relay RY is also bent accordingly, so that the relay contact RY ₁ is turned off.

When the relay contact RY ₁ is turned off in this way, the call circuit 30 in the off-hook state which is not in use is turned off from the telephone line and only the bell circuit 20 is connected to the telephone lines La and Lb.

At this time, the power source Va is supplied to the rechargeable battery Nikic through the resistor R ₁ and charged.

In this state, when the power supply (Va) is cut off, the power charged in the rechargeable battery (Nicd) is relayed through the interlocking hook switch (HS ₂ ) and the thyristor (SCR) turned on with the diode (D ₁ ) due to the voltage drop. The unused off-hook telephone is automatically recovered by supplying RY to drive the relay RY and turning on the relay contact RY ₁ which is turned off by the driving of the relay RY.

And one of the codes shown in the figure TLD is the voltage absorption die evil for absorbing over-voltage when the output voltage to the secondary side of the transformer (T), D ₄ is the back electromotive force absorbing diode for the relay (RY).

The dial tone detection unit (F ₁ ) is a dial tone and a tone tone induced to the secondary side through the primary side of the transformer T connected in parallel to the bell circuit 20 and the call circuit 30. ) And the ohmtone detection unit F ₂ are operated, the timer is operated by the output of the dial tone detection unit F ₁ , and the control circuit 60 is controlled by the operation of the timer to conduct the thyristor SCR. By doing so, the power supply Va is supplied to the relay RY through a conductive thyristor to drive the relay and to turn off the relay contact RY _{1 that} is turned off by the relay.

That is, the off-hook state of the telephone is automatically restored to the on-hook state, so that the incoming caller can be smoothly received by eliminating the caller's inability to receive a call because of a user's mistake or careless mishandling or an incorrectly raised handset. There is an advantage.

Claims (6)

In the on-hook switching recovery circuit of an off-hook telephone, a bell circuit 20 is connected to a telephone line 10 of a general telephone, and a relay contact RY ₁ and an interlocking hook switch between the bell circuit 20 and the call circuit 30 are connected. HS ₁ ) is connected in series, and the secondary side of the transformer T, whose primary side of the transformer T is connected in parallel to the bell circuit 20 and the call circuit 30, detects a tone tone that detects a dial tone and a busy tone. A control circuit 60 connected to the circuit 40, the tone detection circuit 40 outputting a dial tone (outgoing ohm) detected by the tone detection circuit 40 to the timer circuit 50 and by the timer circuit. A tone detection circuit 40 is connected to the control circuit 60 for controlling and outputting a noisy midtone tone by bypassing the noise of the midtone tone detected by the tone detection circuit 60, and The control circuit 60 for controlling and outputting the dial tone detected during the tone detection circuit 40 and the ohmtone during the driving is driven. A connection (70), and the drive circuit 70 is interlocked hook switch unused off-hook, it characterized in that the (HS ₂₎ to connect to the power supply circuit 80 is configured to be able to facilitate the forwarding of the caller via Telephone automatic recovery circuit. According to claim 1, wherein said tone detection circuit 40, but consists of a dial tone detector (F ₁₎ and a and Huazhong omton detecting section (F ₂₎ for detecting the Huazhong omton for detecting the dial tone, the dial tone detection (F ₁ ) Is connected to the primary side of the transformer (T) and the timer circuit 50 and the control circuit 60, and the midtone detection unit (F ₂ ) is connected to the primary side of the transformer (T) and the control circuit (60). Unused off-hook telephone auto-recovery circuit, characterized in that the connection is configured. The timer circuit 50 of claim 1, wherein the timer circuit 50 that charges the dial tone detected by the dial tone detection unit F ₁ for a predetermined time and outputs the charged voltage to the control circuit 60 after a predetermined time is divided is divided. Comprising a resistor (R ₂ ), (R ₅ ) and a time constant resistor (R ₄ ), a capacitor (C ₁ ) and a PUT, the cathode (K) side of the PUT to the base side of the transistor (Q ₁ ) Connect the anode side (A) of the PUT to the dial tone detector (F ₁ ) via a capacitor (C ₁ ), a resistor (R ₄ ) and the gate side of the PUT through a resistor (R ₃ ) Unused off-hook telephone automatic recovery circuit, characterized in that configured by connecting to the dial tone detection unit (F ₁ ) through ₂ ). The method of claim 1, wherein the control circuit 60 for controlling and outputting the dial tone and the midtone tone is transistors Q ₁ , Q ₂ , resistors R ₅ , R ₆ , diode D _2. ), (D ₃ ), and the base side of the transistor Q ₂ is connected to the dial tone detection unit F ₁ through the collector side of the transistor Q ₁ and a resistor R ₅ , and the emitter side is grounded. And the collector of the transistor Q ₂ is connected to the opto-tone tone detection unit F ₂ through a resistor R ₆ and to the driving circuit 70 through a diode D ₃ , and to the transistor Q ₁ . Emitter side is a non-use off-hook telephone automatic recovery circuit, characterized in that configured by connecting to the drive circuit 70 through a diode (D ₂ ). The driving circuit 70 of claim ₁ , wherein the driving circuit 70 turns on the relay contact RY _{1 that} is turned off by using a voltage charged in the rechargeable battery Nikd when the power supply Va is cut off. ₂ ), a resistor (R ₇ ), a thyristor (SCR), a relay (RY), and a diode (D ₄ ), and the resistor (R ₇ ) forms a capacitor (C ₂ ) at the gate side of the diester (SCR). The diodes D ₁ and D ₂ are connected to the cathode sides of the diodes D, and the cathode K side of the thyristor SCR is connected to the relay RY and the diode D _{4 is} connected to the relay RY. An off-hook telephone automatic recovery circuit for non-used off-hook telephones, characterized in that the connection is made in parallel, and the anode side (A) of the thyristor (SCR) is connected to the interlocking hook switch (HS ₂ ). The power supply circuit 80 using the charged voltage of the rechargeable battery when the power supply (Va) is cut off is a rechargeable battery (Nicd), a diode (D ₁ ) and a resistor (R ₁ ) The power supply Va is composed of a diode D ₁ and a resistor R ₁ , but the power supply Va is grounded through the cathode side of the diode D ₁ and the resistor R ₁ . It is connected to the + axis of the battery (Nicd), the + axis of the rechargeable battery (Nicd) automatic off-use telephone, characterized in that it is configured by connecting to the interlocking hook switch (HS ₂ ) through a diode (D ₁ ) Recovery circuit.