KR890000983B1 - Non-locking line selecting control circuit of telephone - Google Patents

Abstract

The circuit with non-locking switch for selecting the line of two line telephone comprises tone ringer ccts. (100,100'), a rectifying ccts. (200,200'), a line selection and control cct. (300), melody generators (400,400'), a dialing cct. (500). The line selection and control cct. (300) is divided by two parts and each part comprises relays (ry1-3), hook switches (HS1, HS2), nonlocking line switches (LINE1, LINE2), non-locking hold switches (HOLD1, HOLD2), SCRs (SCR1, SCR2), LEDs(LED1-4), piezo electric speakers (PS1, PS2), transformers (T1, T2), set relay (S-RY1-3), reset relays (R-RY1-3), and zener diodes (ZD1-3, ZD11-33).

Description

Non-Locking CO Line Selection Control Circuit for Two-Line Telephone

1 is a schematic diagram of a two-line telephone circuit in which a non-locking trunk line selection control circuit according to the present invention is used.

* Explanation of symbols for main parts of the drawings

100,100 ': tone ringer circuit 200.200': rectifier circuit

300: trunk line selection control circuit 400,400 ': melody generation circuit

500: dial and telephone circuit section L1a, L1b, L2a, L2b: trunk line

ry1, ry2, ry3: relay HS1, HS2: hook switch

LINE1, LINE2: Non Locking Line Switch

HOLD1, HOLD2: Non Locking Hold Switch

SCR1, SCR2: Silicon Controlled Rectifier LED1-LED4: Light Emitting Diode

PS1, PS2: Piezo speaker T1, T2: Transformer

In a two-line telephone that accommodates two trunk lines in one telephone of the present invention, a non-locked trunk line selection having a function of allowing a user to select a desired trunk line with a non-locking switch and make a call among two trunk lines accommodated in the telephone. It relates to a control circuit.

Since the trunk line selection control circuit of the conventional two-line telephone system is operated by a locking switch, it is required to operate the rocking switch repeatedly and continuously, and the use procedure is complicated. The pressing of the rocking switch at the same time causes the switch contact to be damaged.

An object of the present invention is to configure the circuit of the silicon control rectifier, zener diode, relay, condenser, etc. in order to solve the drawbacks of the conventional trunk line selection control circuit, so that the selection control function can be performed in a precise time. Non-locking switch instead of locking switch simplifies the process of button operation and provides a new type of non-locking trunk line selection control circuit that does not overload switch contacts.

Referring to the configuration of the present invention as described in detail based on the accompanying drawings as follows.

First, looking at the overall configuration of the two-line telephone used of the present invention, the tone ringer circuit unit 100 (100 ') and rectifier circuit unit 200 (200') to the trunk line terminals (L1a, L1b), (L2a, L2b) ) Is connected to the rectifier circuit unit 200 (200 '), and the trunk line selection control circuit unit 300 of the present invention is connected, and the trunk line selection control circuit unit 300 is connected, and the trunk line selection control circuit unit Melody generation circuit units 400 and 400 'are connected in parallel within 300, and the dial and telephone circuit unit 500 is connected to the rear end of the trunk line selection control circuit unit 300.

And the non-locking trunk line selection control circuit 300 according to the present invention in detail as follows.

As shown in FIG. 1, the trunk line selection control circuit unit 300 is located between the rectifier circuit unit 200 (200 ') and the dial and telephone circuit unit 500, and among the output terminals of the rectifier circuit unit 200 (200'). Relays ry1 and ry3 are connected at one end, and the resistors 10 (12) and contacts 10 'and 12' of the relays ry1 and ry3 are stable at the time of hold. One end of the transformer T1 and T2 maintaining the state and one end of the hook switch HS1 and HS2 are respectively connected, and a zener diode is connected to the other output one end of the rectifier circuit 200 and 200 ′. One terminal of (ZD1), (ZD11), resistors (R1) (R11) and capacitors (C1) (C11) is connected, and when it is held, a light emitting diode (LED2) having a function of displaying a visual hold state LED4 is connected to one end of transformers T1 and T2 and one terminal of resistors R1 and R11.

In addition, the hook switches HS1 and HS2 are connected between the contacts 10 and 10 'of the relays ry1 and ry3 and the connection points a and a'. Resistor R2, R22 and non-locking line switches LINE1, LINE2 are connected in series with (a '), and a capacitor is connected to one terminal of the non-locking line switches LINE1, LINE2. The terminals of (C2), (C22), silicon controlled rectifiers (SCR1), (SCR11) and zener diodes (ZD2) and (ZD22) are connected, and the cathode terminals of the silicon controlled rectifiers (SCR1) and (SCR11) described above. Capacitors C3 and C33 and resistors R3 and R33 are connected between the gate terminals and the gate terminals, respectively, to prevent malfunction of the silicon controlled rectifiers SCR1 and SCR11. The silicon controlled rectifiers SCR1 and SCR11 are respectively connected. The set relay S-RY2 and the reset relay R-RY2 are respectively connected between the cathode terminal of the ()) and the connection points C and C '.

On the other hand, the non-locking line switches LINE1 (LINE2) and the reset relays R-RY1 (R-RY3) are connected to both ends of the capacitors C1, C11 in series. Between (a ') and junction (b) (b'), the contacts (3, 2) and (4, 8) of the relay ry2 are connected, and the junction (b), (b ') and the junction (d) ), (d '), except that the non-locking hold switch (HOLD1) (HOLD2) is connected instead of the non-locking line switch (LINE1) (LINE2). ), (c ') is the same as the connection form.

The lead wires from the connection points b and b 'are connected to the contacts 12 and 10 of the relay yr2 to be connected to or disconnected from the dial and telephone circuit part 500, respectively. The lead wire from, (d ') is connected to contacts 11 and 9 of relay yr2.

When described in detail with reference to the accompanying drawings, the operation process and the effect of the present invention configured as described above are as follows.

First, when a call signal is input from the trunk lines L1a and L1b through the switch from the other subscriber, the light emitting diode LED1 is turned on and the piezospeaker PS1, which is an output terminal of the tone ringer circuit unit 100, generates a tone ringer signal. .

Therefore, the user sees that the light-emitting diode LED1 is turned on and notices that a signal has been received at the trunk lines L1a and L1b. At this time, when the user picks up the handset, the hook switch HS1 is turned on. When the non-locking line switch LINE1, which is a switch for selecting L1b, is pressed, the power supply of the trunk lines L1a and L1b is connected to the contacts 7 and 10 and the hook switch of the relay ry1 as shown in FIG. HS1), resistor R2 and non-locking line switch LINE1.

When the current from the trunk line power supply passing through the non-locking line switch LINE1 is temporarily charged in the capacitor C2 and the capacitor C2 is charged with a certain amount or more of current, the zener diode ZD2 is turned on, and the conducted current As the gate current is applied to the gate terminal of the silicon controlled rectifier SCR1 to flow into the resistor R3, the silicon controlled rectifier SCR1 is turned on.

When the non-locking line switch LINE1 is turned off, the current charged in the capacitor C2 is discharged, and the discharged current is applied to the set relay S-RY2 through the anode and the cathode of the silicon controlled rectifier SCR1. Therefore, while the set relay S-RY2 is operated, the contacts 3, 2, 12, 14, and 11 and 13 of the relay ry2 are connected.

The capacitor C3 is for preventing malfunction of the silicon controlled rectifier SCR1.

As a result, a call signal from the trunk lines L1a and L1b is applied to the dial and telephone circuit unit 500 through the contacts 12, 14 and 11 and 13 of the relay ry2, thereby allowing the user to connect the trunk lines L1a and L1b. Through the other party can talk to the subscriber. (Here, the state before the operation, that is, the ry2 contacts 3 and 2 in FIG. 1 are connected because the last call was made through the trunk lines L1a and L1b, and the contacts 7 and 10 of ry1 were also connected. ), ry3 contacts (7 ', 10') are always connected when the hold circuit does not operate)

If a call signal from another subscriber is received through another trunk line L2a or L2b while talking to the other party through trunk lines L1a and L1b, the light emitting diode LED3 is turned on and the tone ringer circuit unit 100 is turned on. Piezo speaker PS2, which is an output terminal of ′), generates a tone ringer signal, and the user senses that a signal is received from the trunk lines L2a and L2b.

At this time, when the user wants to hold another busy line (L1a, L1b) for a while and connects the trunk lines (L2a, L2b) to the dial and telephone circuit unit 500 to talk to another subscriber through the trunk line (L2a, L2b). Press the non-locking hold switch (HOLD1).

When the non-locking hold switch HOLD1 is pressed, a part of the current flowing through the known dial and telephone circuit unit 500 is charged in the capacitor C4 through the contact of the non-locking hold switch HOLD1.

At this time, the capacity of the condenser C4 is much larger than that of the condenser C2.

When the non-locking hold switch HOLD1 is turned off, the current charged in the capacitor C4 is discharged while conducting the zener diode ZD3 and flowing to the resistor R4 to apply a trigger to the gate terminal of the silicon controlled rectifier SCR2. And the silicon controlled rectifier (SCR2) is turned on.

The current from the anode terminal and the cathode terminal of the silicon controlled rectifier SCR2 operates the contact point of the set relay S-RY1, and the contact state of the relay ry1 to be interlocked is the contact point at the contacts 7 and 10. To (7,12).

Through the above process, a current is formed through the zener diode ZD1 through the one output terminal of the rectifier circuit unit 200, the contacts 7 and 12 of the relay ry1, and the transformer T1, where the zener diode ZD1 The zener voltage is applied at both ends, and the voltage is held by the resistor (R1) and the light emitting diode (LED2) visually to the user, and the zener voltage (voltage across the ZD1) is the melody generating circuit unit 400. ) And the melody generating circuit unit 400 to drive the melody through the transformer T1 through the rectifying circuit unit 200 to communicate with the other party via the trunk lines L1a and L1b to the trunk lines L2a and L2b. For a while, that is, until the call resumes.

Now, when the user presses the non-locking line switch LINE2 to make a call with the second counterpart subscriber via the trunk lines L2a and L2b, the reset relay R-RY2 operates through the same process as described above. At the same time, the relay ry2 in the set state is in a reset state, and the junction state of the contacts is changed from the contacts 12 and 14 and the contacts 11 and 13 to the contacts 10 and 14 and the contacts 9 and 13. Will be converted.

Therefore, the call signal applied through the trunk lines L2a and L2b is inputted to the dial and telephone circuit unit 500 through the contacts 10 and 14 and the contacts 9 and 13, and finally, the call state is available to the second party. Will be.

As described in the above process, if the contents of the call with the second caller need to wait without requiring an emergency, the contact 7 ', 10' is operated by pressing the hold switch HOLD2 and operating the set relay S-RY3. Relay ry3 in the state of) is switched to the contact (7 ', 12') state to the melody through the melody generating circuit unit 400 'to the second caller, the user himself through the light-emitting diode (LED4) You can see the call on hold.

As described above, if the call state through the trunk lines L2a and L2b is suspended, the line switch LINE1 is pressed if the call resumes through the trunk lines L1a and L1b in the same form as the first.

When the line switch LINE1 is pressed, the capacitor C1 in the charged state discharges the current and the discharged current operates the reset collector R-RY1, and the relay is reset to the state of the initial call and waits for a recall. You will be able to talk back to the first caller you have.

As can be seen in the operation of the present invention as described above, the user can conveniently use four non-locking switches (LINE1, LINE2, HOLD1, HOLD2) according to the selection of the trunk line, the present invention non-locking trunk line selection control circuit It is easy to use and accurate time, without overloading the contacts without defects such as the damage of the contacts caused by the pressing of two or more switches at the same time when the force is applied and the excessive force. It is a very convenient and useful invention with the ability to withhold or select trunk lines.

Claims (1)

In the trunk line selection control circuit of a general telephone which accommodates two trunk lines, the contacts 10 and 10 'of the relays ry1 and ry3 are connected to the hook switches HS1 and HS2, respectively. The transformers T1, T2 and Zener diodes ZD1, ZD11 are connected to the contacts 12, 12 'of the relays ry1, ry3, and Zener diodes ZD1, ZD11. Resistor (R1), (R11), light-emitting diode (LED2), (LED4), capacitor (C1) (C11), non-locking line switch (LINE1) (LINE2) and reset relay (R-RY1) at each end of (R-RY3) is connected in series and parallel respectively, and between the connection points (a) and (c) and between the connection points (a ') and (c'), the resistors (R2) and (R22) and non-locking are respectively. Line switch (LINE1), (LINE2), condenser (C2), (C22), silicon controlled rectifier (SCR1), (SCR11) and set relay (S-RY2), reset relay (R-RY2) Contact points (3, 2) and (4, 8) of the relay (ry2) are connected between the connection points (a) and (b) and between the connection points (a ') and (b'), respectively. Non-locking hold switch (HOLD1), (HOLD2), condenser (C4), (C44) and silicon controlled rectifier (SCR2) between the connection points (b) and (d) and between the connection points (b ') and (d'). ), (SCR22) and set relays (S-RY1) and (S-RY3) are respectively connected, and a Zener is connected between the anode terminal and the gate terminal of the silicon controlled rectifiers SCR1, SCR2, and SCR11. Diodes ZD2, ZD3, ZD22, ZD33 and capacitors C3, C5, C33, C55 and resistor R3 in parallel between the gate terminal and the cathode terminal. R4), (R33) and (R44) are connected to each other, and the contact points (12) and (10) of the relay ry2 are connected between the connection points (b) and (b '), and the connection points (d) and (d'). The trunk line control circuit of the two-line telephone line, characterized in that the contact (11), (9) of the relay (ry2) is connected between.

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