KR920005007B1 - Ring-linear il device with two times as much output - Google Patents

Abstract

The ringer Linear IC doubles the call signal to prevent the decreasing of ring sound pressure when many telephones are connected to one telephone line in parallel. The IC comprises a positive phase amplifying circuit (11) comprising a darlington pair (1) comprising two npn transistors; a darlington pair comprising two pnp transistors, a current source (3), and a switching transistor (Q5) for switching the darlington pairs (3), a negative phase amplifying circuit (12) having same structure to the positive phase amplifying circuit (11), and a current source (13) connected to the next stage of the negative phase amplifying circuit (2) to control the negative phase amplifying circuit (12). The output signals of the amplifying circuits (11,12) are synthesized to produce doubled output.

Description

Ringer linear integrated circuit diagram with double output

1 is an output circuit diagram of a ringer linear integrated circuit used in the related art.

2 is an application implementation circuit diagram of a ringer linear integrated circuit used in the related art.

3 is an output circuit diagram of a ringer linear integrated circuit having twice the output according to the present invention.

4 is a sub waveform state diagram of an output circuit diagram of the present invention.

5 is an application circuit diagram of a ringer linear integrated circuit having a double output according to the present invention;

FIG. 6 is a diagram of each sub waveform of the output circuit diagram of FIG.

* Explanation of symbols for main parts of the drawings

1, 2: Darlington fair Q1, Q2, Q3... Transistor

3, 13 current supply circuit 4 switching unit

5: call signal 6: trance

7 speaker 8 piezoelectric element

10 ringer linear integrated circuit 11 positive phase output circuit

12: reverse phase output circuit

15: output circuit of integrated circuit (for ringer linear with double output)

P1, P2: Output terminal I1, I1 ', I2, I2', I4: Current source

TECHNICAL FIELD The present invention relates to a telephone ring generation circuit, and more particularly, to a ringer linear integrated circuit which makes it possible to prevent sound pressure from being reduced when several telephones are connected in parallel to one telephone line.

In the ringer linear integrated circuit that generates the call signal, when several telephones are connected in parallel with one telephone line, the output impedance is increased and the sound pressure is reduced, so that the call signal cannot be heard. Therefore, conventionally, even when several telephones are connected to one telephone line in parallel, there is a disadvantage in that an amplifier is used at the output of the ringer linear integrated circuit.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to increase the size of the sound pressure outputting a call signal by 2 times and to eliminate the decrease in the magnitude of the sound pressure by the output impedance of a plurality of telephones. To provide a circuit.

This object is achieved by synthesizing the output signals of the output circuits having opposite phases with the output circuits generating the output of the positive phase by the call signal and the output circuits generating the output of the reverse phase by the call signal. Can be.

The present invention has a darlington pair composed of npn transistors, a darlington pair composed of pnp transistors, and an output circuit composed of a current source, and includes a switching transistor for inverting the phase.

Hereinafter, described in detail by the accompanying drawings as follows. 1 shows an output circuit diagram of a ringer linear integrated circuit used in the related art, and is composed of a Darlington pair 1 composed of npn transistors Q1 and Q2, and a pnp transistor Q3 and Q4. And a Darlington pair (2), a current source supply circuit (3) composed of transistor passive elements, a switching transistor (Q5) for controlling the operation of the Darlington pairs (1) and (2).

The output circuit 11 of the ringer linear integrated circuit configured as described above swings about OV or 0.7 V in the voltage applied to the base side of the transistor Q5. In this case, when the transistor Q5 is in the off state, the darlington The transistors Q1 and Q2 of the pair 1 are turned on and the transistors Q3 and Q4 of the Darlington pair 2 are turned off so that the output terminal P1 has the H level state signal. Is output.

The waveform having the magnitude of VCC-VCE (sat) Q1-VBEQ2 is output as the H level status signal. When the transistor Q5 is turned on by the state signal applied to the base side, the Darlington pair 2 transistors Q3 and Q4 are turned on, and the Darlington pair 1 is turned off. The terminal P1 is a L-level state signal and has a magnitude of VCE (sat) Q4 + VBEQ3.

FIG. 2 is an application embodiment of a ringer linear integrated circuit used in the related art, where (a) is a circuit diagram when outputting a ring tone to a speaker, and (b) is a circuit diagram when outputting a ring tone through a piezoelectric element.

(a) shows a ringer linear integrated circuit 10 to which a ringing signal is applied, a transformer 6 connected to an output side of the ringer linear integrated circuit 10, and a ringer linear integrated circuit 10, respectively. It is comprised as the piezoelectric element 8 connected to the output side.

In the application circuit diagrams (a) and (b) configured as described above, when the telephone line input signal is applied as the alternating call signal 5, the speaker 6 is full-wave rectified inside the ringer linear integrated circuit to output H level and L level. B) is output through the piezoelectric element 8. However, as described above, in the case where several telephones are connected in parallel, the output impedance is increased to reduce the sound pressure.

3 is an output circuit diagram of a ringer linear integrated circuit having a double output according to the present invention. The positive phase output circuit 11 having the same configuration as the output circuit of the conventional ringer linear integrated circuit, and the positive phase An antiphase output circuit 12 for inverting the phase, a current source supply circuit 13 for driving the antiphase output circuit 12, and an output terminal P1 and an output terminal P2, respectively, The output circuit 15 of the ringer linear integrated circuit having twice the output can be configured by generating output waveforms that are the same and opposite in phase with each other.

In the above, the positive phase output circuit 11 includes a Darlington pair 1 composed of npn transistors Q1 and Q2, a Darlington pair 2 composed of pnp transistors Q3 and Q4, and a transistor. A current source supply circuit 3 composed of passive elements, a switching transistor Q5 for controlling the operation of the Darlington pairs 1 and 2, and a. The anti-phase output circuit 12 is composed of Darlington pairs 1 ', 2', current source supply circuit 3 ', and switching transistor Q5' having the same configuration as the positive phase output circuit. The current source supply circuit 13 is composed of a transistor Q6 and a current source 14.

The basic operation of the positive phase output circuit 11 of the present invention configured as described above is the same as that of the output circuit diagram 11 of the ringer linear integrated circuit of FIG. When the voltage of OV is applied to the base side of the transistor Q6 of the current source supply circuit 13 and the transistor Q6 is turned off, the current source I2 'is supplied to the base side of the transistor Q5' and turned on. do. Therefore, transistors Q1 'and Q2' are turned off, transistors Q3 'and Q4' are turned on, and output terminal P2 is-| VCC- (sat) Q4'-VBE Q3 '| The output waveform of magnitude is output.

In addition, when a voltage of 0.7 V is applied to the base side of the transistor Q6 and the transistor Q6 is turned on, the transistor Q5 'is turned off, so the Darlington pair transistors Q1' and Q2 'are turned on. And the Darlington pair transistors Q3 'and Q4' are turned off, and the output terminal P2 is at the L level.

Referring to the waveform diagram of FIG. 4, when the call signal of the square wave is supplied to the bases of the transistors Q5 and Q5 'of the positive phase output circuit 11 and the antiphase output circuit 12, the respective output terminals ( P1) and (P2) generate output signals that are opposite in phase and symmetrical. Therefore, the ringer linear integrated circuit 10 used in the conventional FIG. 2 is used by grounding one side of a transformer when applied to an application circuit such as FIG. 5. In the circuit of FIG. 5, both ends of the transformer are output terminals. It is connected to (P1) and (P2) and used to obtain the size of 2 | VCC-VCE (sat) -VER | when the output circuit part of the ringer linear integrated circuit 10 is composed of a load. . In other words, as in the circuit of FIG. 6, the output waveforms of the ringer linear integrated circuit having the output doubled as the outputs of the output terminal R1 and the output terminal P2 are combined.

As described above, the present invention comprises a positive phase output circuit that generates a positive phase pulse by a call signal and an antiphase output circuit that generates a reverse phase pulse by the call signal so that the two outputs are synthesized so that the ringer wire is combined. The output of the type integrated circuit can be doubled, and it is possible to prevent the sound pressure from being decreased due to the increase of the output impedance when connecting several units in parallel in a single line. There is no need to effect.

The present invention describes that the call signal is amplified twice in the telephone, but is not limited to the telephone circuit. That is, in the case of a circuit for generating a specified ringtone or alarm sound, such as a call signal, it can be easily applied according to the detailed description of the present invention and can be obviously implemented as a person working in the same field.

Claims (1)

of the Darlington pair (1) composed of npn transistors, the Darlington pair (2) composed of pnp transistors, the current source supply circuit (3) using transistor passive elements, and the Darlington pair (1), (2) A switching transistor Q5 for controlling the operation, and a positive phase output circuit 11 composed of; An antiphase output circuit 12 having the same configuration as the positive phase output circuit 11; A current source supply circuit (13) connected to a rear end of the antiphase output circuit (12) for controlling the antiphase to be output; Ringer linear integrated circuit.

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