JPS5944834B2 - Telephone ringing signal power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone ring signal power supply device that sends a ring signal voltage (voltage for ringing a telephone) to an exchange.

Conventional crossbar switching equipment uses a working/standby system for the calling signal power supply for system reliability.

In this case, since the circuit that generates the ringing signal voltage is of an analog type, it is difficult to stack single capacity units, so the power supply capacity of the device is initially installed with the final exchange capacity estimated by the maximum telephone subscriber. Was. Therefore, the initial capital investment was huge and uneconomical. Recently, when introducing electronic exchanges, the aim is to eliminate the drawbacks of the conventional system A. to reduce the initial capital investment B. to increase the number of systems by adding a single capacity ring signal power supply C. to improve system reliability There are demands for further improvements in

In this case, in view of the functionality of the electronic exchange and the performance of the calling signal power supply devices, it is necessary that the ringing signal voltages of the plurality of ringing signal power supply devices be synchronized.

Here, the fact that the ringing signal voltages are synchronized means that
The intermittent start point and end point are the zero cross potentials of the continuous ringing signal voltages, which means that the plurality of ringing signal voltages are almost the same at these starting points and ending points. In addition, the frequency of the ringing signal voltage varies depending on the national circumstances of each country.
Nine types between 16Hz and 66Hz are typical.

In this case, each ringing signal power supply device must be set to one of the same frequencies and maintained in the P7 state.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telephone ringing signal power supply device that can satisfy the above-mentioned requirements A, B, and C.

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a telephone ringing signal power supply device 1 according to the present invention. In the figure, 2 is a microcomputer, which is made of, for example, a crystal oscillator and has a 6MHz
It stores an oscillator 3 having an oscillation frequency of It is comprised of a memory circuit 4 for storing data, a microprocessor (central processing circuit) 5, etc., which has the function of sequentially processing the digital signals stored in the memory circuit 4 according to a program. Reference numeral 6 denotes a ringing signal voltage generation circuit which converts a digital quantity corresponding to the ringing signal voltage outputted from the microcomputer 2 into an analog ringing signal voltage and converts the power to suit the load 21 required by the exchange side; This is a calling signal voltage output terminal output from the calling signal voltage generating circuit 6.

Reference numeral 7 indicates an operation setting for determining whether this calling signal power supply device 1 operates as a main unit 2 or synchronously operates as a slave unit of another call signal power supply unit according to a condition signal given from a condition signal generation circuit (not shown). A is a condition signal input terminal.

Reference numeral 8 denotes a first circuit which controls whether or not to output the output synchronization signal from the miterrocomputer 2 to the synchronization signal output terminal XM of the calling signal power supply device 1 using the output signal of the setting circuit 7.
This is an interlock circuit.

9 connects this call signal power supply device 1 from another call signal power supply device.
This is a second interlock circuit which controls whether or not the input synchronizing signal applied to the synchronizing signal input terminal S of the microcomputer 35 is supplied to the microcomputer 2 based on the output signal of the setting circuit 7.

10 is controlled by the first interlock circuit 8, and when the output synchronization signal from the microcomputer 2 is not output to the synchronization signal output terminal M, the synchronization signal input terminal Kikuko S
This is a second interlock circuit which is operated by being supplied with the output signal η of the setting circuit 7 via the inverter 11 so as to output the input synchronizing signal given from the outside as an output synchronizing signal.

The telephone ringing signal power supply device 1 of the present invention operates differently depending on whether it is given a condition signal as a main device or a condition signal as a slave device from a condition signal generation circuit (not shown). The operation will be explained in each case.

[1] When a condition signal for the main engine is given, in this case, when the condition signal for the main engine is input to the condition signal input terminal A, the setting circuit 7 connects the first, second, and third interfaces. An output signal is sent to the lock circuits 8, 9, and 10 as the main engine.

When the output signal from the setting circuit 7 as the main unit is given to the first interlock circuit 8, the first interlock circuit 8 controls the output synchronization signal of the microcomputer 2 to be outputted to the synchronization signal output terminal M. .

As a result, a synchronizing signal can be given from this telephone ringing signal power supply device 1 to other telephone ringing signal power supply devices. When the output signal from the setting circuit 7 as the main unit is given to the second interlock circuit 9, the input synchronization signal given from another telephone ringing signal power supply device to the synchronization signal input terminal S is input to the microcomputer 2. control so that it does not occur. When the third interlock circuit 10 is given an output signal as the main engine from the setting circuit 7 via the inverter 11, the third interlock circuit 10
The interlock circuit 8 operates in a manner opposite to that of the interlock circuit 8, and operates so as not to output the input synchronizing signal applied to the synchronizing signal input terminal S to the synchronizing signal output terminal M as an output synchronizing signal. Further, the microcomputer 2 outputs a digital quantity for the ringing signal and inputs it to the ringing signal voltage generation circuit 6, which performs digital-to-analog conversion, polarity inversion, power amplification, and waveform shaping of the digital quantity. A predetermined calling signal voltage synchronized with the output synchronization signal is output to the calling signal voltage output terminal B. 1] When a condition signal as a slave is given, in this case, when the condition signal as a slave is input to the condition signal input terminal A, the setting circuit 7
, third interlock circuits 8, 9, and 10 output signals as slave units.

When the first interlock circuit 8 is given an output signal as a slave from the setting circuit 7, the first interlock circuit 8 prevents the output synchronization signal of the microcomputer 2 from being output to the synchronization signal output terminal M. Control.

When the second interlock circuit 9 is given an output signal as a slave from the setting circuit 7, the second interlock circuit 9 is connected to the synchronizing signal input terminal S from another telephone ring signal power supply. The microcomputer 2 is controlled to input the input synchronization signal to the microcomputer 2.

As a result, the microcomputer 2 is operated in synchronization with the input synchronization signal. When the third interlock circuit 10 receives an output signal as a slave from the setting circuit 7 via the inverter 11, it operates in the opposite direction to that of the first interlock circuit 8, and provides the signal to the synchronizing signal input terminal S. It operates so that the input synchronizing signal, which has been input, is output as an output synchronizing signal to the synchronizing signal output terminal M via this third interlock circuit 10.

This output synchronization signal is provided to other telephone ringing signal power supplies. FIGS. 2A and 2B show an example of the synchronization relationship between the input synchronization signal and the calling signal voltage.

When an input synchronizing signal as shown in FIG. 2A is applied to the microcomputer 2, the microcomputer 2 stops counting in each section at the falling edge of the signal, and restarts counting at the rising edge, with a period T. This operation is repeated. At the rising edge of the input synchronizing signal, the calling signal voltage starts to appear at a predetermined phase, connects for a time T, pauses for a time T2, comes out again for a time T3, and stops at the falling edge of the input synchronizing signal. Time Tl, T3 when the calling signal voltage appears and time T2 when it stops
is programmed into the microcomputer 2 in advance. Although one microcomputer 2 is used in FIG. 1, two or more microcomputers may be used if the intermittent times of the calling signal voltage vary.

FIG. 3 shows an example of a system in which the telephone ringing signal power supply device 1 shown in FIG. 1 is used as a unit, n units are connected according to the required capacity, and these are operated synchronously. In the figure, reference numeral 11 denotes a ring signal power source No. 1 device, 12 a ring signal power source No. 2 device, . . . 1n a ring signal power source No. Synchronous signal output terminal M of connected No. 01 device 11
The output synchronization signal a1 is applied as an input synchronization signal to the synchronization signal input terminal S of the second device 12.
An output synchronizing signal A2 is applied from the synchronizing signal output terminal M of the device No. 3 as an input synchronizing signal to the synchronizing signal input terminal S of the device No. 3, not shown.
An output synchronous signal A is output from the synchronous signal output terminal M of the device 1n.
n is applied to the synchronization signal input terminal S of the first device 11 as an input synchronization signal.

12 is No. 1 device 11, No. 2 device 12, ... No. n device 1
Calling signal voltages Bl, b2, . . . issued from n respectively.
・Bn is monitored and each device 11~
1n is a condition signal generating circuit which provides a condition signal; 13 is an electronic exchange to which each of the calling signal voltages b1 to Bn is applied.

In such a configuration, when the condition signal generation circuit 12 sets the first device 11 as the main device and the remaining devices 12 to 1n as slave devices, the first device 11 outputs the calling signal voltage b1 synchronized with the synchronization signal a1 to the electronic exchange. At the same time, this synchronizing signal A is applied from the output terminal M to the input terminal S of the second device 12. The second device 12 operates as a slave device and receives the synchronization signal a.
1 and outputs a calling signal voltage B2 synchronized with this synchronizing signal A2 to the electronic exchange 13.

The second device 12 inputs the synchronization signal A2 from the output terminal M to the input terminal S of the third device.

Similarly, the nth device 1n outputs the synchronizing signal An from the output terminal M.
is applied to the input terminal S of the No. 1 device 11. Therefore, each device 11-1n is operated synchronously. If an accident occurs in the No. 1 device 11 in such a state, the condition signal generation circuit 12 detects this and prevents the synchronization signal a1 from being transmitted from the No. 1 device 11 to the next stage No. 2 device 12. The condition signal generating circuit 12 sets the No. 1 device 12 as the main engine and the other devices 13 to 1n as slave units, and causes the devices 12 to 1n except the No. 1 device 11 to operate synchronously. Note that the device of the present invention is not only used in the system shown in FIG. Of course, it can also be used as a backup system.

As described above, the telephone ringing signal power supply device according to the present invention is equipped with a microcomputer to form a ringing signal voltage and a synchronizing signal voltage based on a digital signal, and the condition signal is a condition signal as a main unit. Depending on whether it is a condition signal for a slave machine or a condition signal for a slave machine, if it is a condition signal for a main machine, it will generate a call signal voltage in synchronization with the synchronization signal generated by this device, and if it is a condition signal for a slave machine, it will generate a call signal voltage. Since a synchronization signal synchronized with the synchronization signal from the main machine is output and a ringing signal voltage synchronized with this synchronization signal is generated, this device can be treated as one unit and the number of units can be increased according to the power supply capacity. This makes it possible to cope with an increase in power supply capacity.

Therefore, according to the present invention, initial equipment investment can be reduced. Further, according to the present invention, since each unit can be operated synchronously, the reliability of the system can be further improved.

[Brief explanation of drawings]

1 is a block diagram showing an embodiment of the telephone ringing signal power supply device according to the present invention; FIGS. 2A and 2B are waveform diagrams showing the relationship between the synchronization signal of FIG. 1 and the ringing signal voltage; and FIG. The figure is a block diagram showing an embodiment of a calling signal power supply system using the calling signal power supply device according to the present invention. 2...Microcomputer, 3...
Oscillator, 4...Memory circuit, 5...
Microprocessor 1 6...Call signal voltage generation circuit, 7...Setting circuit, 8...1st
9...second interlock circuit, 10...third interlock circuit.

Claims (1)

[Claims] 1. A microcomputer that includes an oscillator, a memory circuit, and a microprocessor and outputs a digital quantity corresponding to the calling signal voltage and an output synchronization signal that is output in synchronization with this digital quantity, and the digital quantity that is output from the microcomputer. a ringing signal voltage generation circuit that outputs a ringing signal voltage by performing digital-to-analog conversion, waveform shaping, etc.; and a setting circuit that sets whether the ringing signal power supply device operates as a main unit or a slave unit. , a first control device for controlling an output synchronization signal to be outputted from the microcomputer so that it is outputted to the outside when the setting circuit outputs an output signal as a main unit, and not outputted to the outside when it outputs an output signal as a slave unit; An interlock circuit and an input synchronizing signal given from the outside are not given to the microcomputer when the setting circuit outputs an output signal as a main unit, but are supplied to the microcomputer when the setting circuit outputs an output signal as a slave unit. A second interlock circuit to control and an input synchronization signal given from the outside are not output to the outside when the setting circuit outputs an output signal as a main machine, and output a synchronization signal when it outputs an output signal as a slave machine. 1. A telephone ringing signal power supply device comprising: a third interlock circuit for outputting a signal to the outside.