KR200212096Y1 - A circuit for telephone - Google Patents

Abstract

The present invention relates to a telephone circuit that enables a normal call by ringing a ring when a handset is received even when the handset is separated from a hook switch around a user's part, and detects a call state such as a busy signal and a voice signal. Compares the call state detection unit, the hook switch detection unit for detecting the on / off of the hook switch, the output signal of the call state detection unit and the output signal of the hook switch detection unit, and the bell is forcibly Comprising a comparison output unit for switching the circuit so as to drive, a bell driving unit for driving the bell, and the steady state return unit for returning the telephone circuit to the original state by the operation of the hook switch after the bell driving.

Description

Telephone circuit {A CIRCUIT FOR TELEPHONE}

The present invention relates to a telephone circuit, and more particularly to a telephone circuit that allows a normal call by ringing when receiving a call even when the handset is separated from the hook switch around the user.

As is well known, when the handset provided in the telephone is not correctly seated on the hookswitch by the user's surroundings, a normal call cannot be made, and the telephone to solve this problem has already been disclosed.

The function is to forcibly drive the bell to notify the user when receiving a telephony signal (including a bell signal) even when the handset is separated from the hook switch and is in a busy state for a long time.

However, such a telephone adopts a voice pick-up method, so as to detect the voices of the users on the call and determine whether the call is in a busy state. There was a problem that does not recognize that you are actually in a normal call, the phone with such a function has been a problem that can not be adopted in the existing phone only the phone itself is released. The reason is that by adopting the voice pickup method, a circuit added to the handset circuit in the telephone must be configured.

The present invention has been made to solve the above problems, and the telephone circuit to accurately determine whether the phone users, both parties are busy with each other, to drive the receiver bell even when the handset is separated from the hook switch by the sub-circumference It is an object of the present invention to provide.

Another object of the present invention is to provide a telephone circuit having the above function that can be easily employed in an existing telephone.

The present invention for achieving the above object is a call state detection unit for detecting a call state, such as a busy signal and a voice signal, a hook switch detection unit for detecting the on and off of the hook switch, the output of the call state detection unit And the output signal of the hook switch detection unit, the comparison output unit for switching the circuit so that the bell is forcibly driven when the hook switch is turned off by sub-circumference, the bell driving unit for driving the bell, and the operation of the hook switch after the bell driving. By the steady state return unit for returning the telephone circuit to its original state.

1A and 1B are temporary examples showing the telephone circuit according to the present invention.

<Explanation of symbols for main parts of the drawings>

10: call state detection unit 20: hook switch detection unit

30: comparison output unit 40: bell drive unit

50: steady state return unit

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are temporary examples showing the telephone circuit according to the present invention.

As shown, the present invention is a call state detection unit 10 for detecting a call state, such as a busy signal and a voice signal, hook switch detection unit 20 for detecting the on, off of the hook switch, and the call A comparison output unit for outputting the state sensing unit 10 and the output signal of the hook switch sensing unit 20 to drive and output a relay for circuit switching so that the bell can be forcibly driven when the hook switch is turned off due to the subcircumference. 30, a bell drive unit 40 for driving the bell, and a steady state return unit 50 for returning the telephone circuit to its original state by the operation of the hook switch after the bell drive.

In addition, the telephone circuit according to the present invention, as shown, the telephone line (LI) (L2) is configured to be applied to the telephone via the line (L1-1) (L2-1) through the circuit, the telephone itself It consists of a separate circuit that is not built in.

The telephone circuit according to the present invention configured as described above will be described in more detail.

First, the call state detection unit 10 has one side line L1 of a telephone line LINE connected to a primary side of a transformer T, and a secondary side of the transformer T is a rectifying diode D1 (D2). And a smoothing capacitor C1 to the non-inverting terminal (+) of the amplifier OP1. In addition, a resistor R1 is connected to an inverting terminal (−) of the amplifier OP1, and an output terminal thereof is connected to a non-inverting terminal (+) of a comparator COM1, and an inverting terminal (−) of the amplifier OP1. And an output circuit composed of a capacitor C2 and a resistor R2, and a divided voltage of the resistor R3 and the resistor R4 is applied to the inverting terminal (-) of the comparator COM1 as a reference voltage. Configured to be authorized.

The hook switch detecting unit 20 has both ends of the lines L1 and L2 connected to the contacts of the four diodes D7 to D10 through the resistor R5 and the resistor R6, and the output terminal thereof is the resistor R7. And an input terminal of the photocoupler PC through the capacitor C3. The output terminal of the photocoupler PC is connected to the inverting terminal (-) of the comparator COM2 through the resistor R8, and the resistor R9 and the resistor R10 are connected to the non-inverting terminal + of the comparator COM2. Is applied to apply a divided reference voltage.

The comparison output unit 30 has the outputs of the comparator COM1 and the comparator COM2 of the call state detecting unit 10 and the hook switch detecting unit 20 through diodes D3 and D4, respectively, Connected to the base of transistor Q1 via R21 and capacitor C10, and the collector terminal of transistor Q1 is connected to input terminal I of multivibrator VB1 via resistor R22. The output terminal O of the multivibrator VB1 is connected to the first relay coil RC1.

The bell driver 40 has a line L1 and L2 connected to a terminal RING TIP of the bell driving integrated circuit IC, and is connected to an output terminal O of the bell driving integrated circuit IC. The buzzer BZ is configured to be connected.

The steady state return unit 50 is connected to the non-inverting terminal (+) of the comparator COM3 through a line L1 (L1-1) through a resistor R12 (R13) and a capacitor C6, and the comparator A voltage divided by the resistor R15 and the resistor R16 is applied to the inverting terminal (−) of the COM3 as a reference voltage. The output terminal of the comparator COM3 is connected to the input terminal I of the multivibrator VB2, and the output terminal O of the multivibrator VB2 is connected to the second relay coil RC2.

In addition, a first relay switch contact RY1a and a second relay switch contact RY2a are interposed between the line L2 and the line L2-1 connected to the telephone side, and are connected to the line L1 and the telephone side. The first relay switch contact point RY1b and the second relay switch contact point RY2b are interposed between the first and second relay switch contacts RY1b and are driven by the first and second relay coils RC1 and RC2.

Here, reference numerals R11, R17 to R19 are resistors, C4, C7 to C9 are capacitors, and D5 and D6 are diodes.

The operation of the present invention configured as described above will be described below.

First, the initial state of the circuit is a state in which the lines L1-1 and L2-1 are switched to the second relay switch contact RY2b and the second relay switch contact RY2a, respectively. Thus, the lines L1 and L2 are connected via the lines L1-1 and L2-1 on the telephone side, thereby allowing normal communication.

In such a state, at the time of a call, both busy signals or a voice signal of the user through the line L1 are induced on the secondary side of the transformer T of the call state detecting unit 10, and the induced signal is It is input to the non-inverting terminal (+) of the amplifier OP1 through the capacitor C1 and the resistors D1 and D2. Therefore, the input signal is amplified by the amplifier OP1 and input to the non-inverting terminal (+) of the comparator COM1, and the comparator COM1 outputs a high level signal.

As a result, the comparator COM1 outputs a high level signal when the user is in a normal call, and when the user is not in a call, no voltage is induced on the secondary side of the transformer T, so that the comparator COM1 is low. The level signal is output.

In addition, when the handset is correctly mounted on the hook switch, the hook switch detecting unit 20 is turned off, and a high voltage of 48 V (volts) is induced in the lines L1 and L2. . This voltage turns on the photocoupler PC via resistors R5, R6 and diodes D7-D10. Therefore, a low signal is output to the collector output terminal of the photocoupler PC so that the comparator COM2 outputs a high level signal. On the other hand, when the handset is disconnected from the hook switch during a call or the user's carelessness, and the hook switch is turned on, a low voltage voltage is induced in the lines L1 and L2. Therefore, the voltage at this time does not turn on the photocoupler PC, so that the high level signal is input to the inverting terminal (-) of the comparator COM2, and the comparator COM2 outputs the low level signal.

Therefore, when the call is in normal operation, the output of the comparator COM1 of the call detection state unit 10 and the output of the hook switch detection unit 20 both become high levels and are applied to the comparison output unit 30.

Each of the high level signals applied to the comparison output unit 30 passes through a diode D3 and a diode D4 and passes through resistors R20 and R21 and a capacitor C10 to the base of the transistor Q1. When applied, the transistor Q1 is turned on. By turning on the transistor Q1, the collector terminal becomes low level and is input to the input terminal I of the multivibrator VB1, whereby the multivibrator VB1 does not operate.

In this state, if the user detaches the handset from the hook switch to the peripheral circumference, the comparator COM1 of the call state detection unit 10 and the comparator COM2 of the hook switch detection unit 20 are both low level signals. Will print

Accordingly, the transistor Q1 of the comparison output section 30 is turned off and its collector stage is at a high level so that the multivibrator VB1 outputs a low level signal to the output terminal O, thereby providing the first relay coil RC1. Become a woman. Therefore, the switch contacts RY1a and RY1b of the first relay are switched to telephone line lines L2-1 and L1-1, respectively, so that the telephone lines L1 and L2 themselves are bell driven by the bell drive section 40. FIG. It is connected to be applied to the terminal RING (TIP) of the integrated circuit IC.

At this time, if the call request reception signal (including the bell signal) is input to the terminal RING (TIP) through the line (L1) (L2), the bell driving integrated circuit (IC) outputs the bell driving signal to the output terminal (O). The buzzer BZ is driven. Therefore, when the user hears the ringtone and presses the hook switch once, the power supply Vcc is instantaneously applied through the line L1-1, so that the resistances R12 and R13 of the steady state return unit 50 are applied. And the capacitor C6 are applied to the non-inverting terminal (+) of the comparator COM3, and the comparator COM3 outputs a high level signal so that the multivibrator VB2 outputs a low level signal to the output terminal O. Output Accordingly, the second relay coil RC2 is excited, and the switch contacts RY2a and RY2b are switched to the lines L2-1 and L1-1, respectively. Therefore, the telephone lines L1 and L2 are connected to be supplied to the telephone as it is, and the call is enabled.

As described above, the present invention is not only a useful design to receive an incoming call, even if the phone user does not place the handset on the hook switch accurately, even if the call continues, it is also easy to adopt the existing phone This is a useful technique to do.

Claims (1)

A call for sensing a busy or voice signal induced in the transformer T through a transformer T, an amplifier OP1, an integrated circuit C2, R2, and a comparator COM1 on one side of a telephone line. State detection unit 10; Hook switch detection unit for detecting the hook switch on and off of the phone through the resistor (R5) (R6), four diodes (D7 ~ D10), photocoupler (PC) and comparator (COM2) connected to both ends of the telephone line 20; Outputs of the call state sensing unit 10 and the hook switch sensing unit 20 are connected to the transistor Q1 through diodes D3, D4, resistors R20, R21, and capacitor C10, A comparison output section 30 composed of a multivibrator VB1 and a first relay coil RC1 driven by the output of the transistor Q1; A bell driver 40 including a bell driving integrated circuit IC and a buzzer BZ connected to the telephone lines L1 and L2 when driving the first relay; A steady state return unit 50 including a comparator COM3 and a multivibrator VB2 and the like so that the second relay coil RC2 is driven when the hookswitch of the telephone is turned on and off; And The line L2-1 input to the telephone is switched to the first relay switch contact RY1a to which the power supply Vcc is applied to one side, or to the second relay switch contact RY2a connected to the telephone line L2. A second relay switch contact point RY1b having one line L1-1 connected to an input terminal of the bell driving unit 40 or a second relay switch contact point connected to an input terminal of the steady state return unit 50 at one side thereof. A telephone circuit, configured to be switched to RY2b).