JPH0350468B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In a telephone terminal device, the dial pulse generating means can be switched to be supplied with power from either a local power source or a local power source, and the dial pulse generated in the dial pulse generating means is converted into a dial pulse through an isolator. By outputting to the sending means, the number of isolators can be significantly reduced compared to the case where an isolator is inserted into the input section of the dial pulse generating means.

[Industrial application field]

The present invention relates to an improvement in a power supply system for a telephone terminal device that sends dial pulses by operating numeric buttons.

In recent years, telephone terminals housed in dial-pulse automatic exchanges also have four rows of three lines instead of a rotary dial, similar to push-button dial telephones.
Numerical buttons are arranged in rows for user convenience.

Such a telephone terminal device includes a dial pulse generating unit that detects the operation of the number buttons and generates a predetermined number of dial pulses having a speed and make rate specified by the automatic exchange to which it belongs; Based on this, it is necessary to provide a dial pulse sending section that cuts off and on the current flowing through the telephone line leading to the affiliated automatic exchange and sends dial pulses to the automatic exchange.

On the other hand, in addition to the basic functions normally provided by telephones, telephone terminal devices have a so-called speed dial function that converts the telephone number of the other subscriber into an abbreviated number with fewer digits and calls the other subscriber using the abbreviated number. , a so-called one-touch dialing function that allows you to call a subscriber you frequently call with a single press of a button provided for the subscriber, and a function that memorizes the telephone number of the subscriber you sent last time and presses a specific push button. Various functions are being added, such as a so-called repeat call function that retransmits the call, and a function that displays dialed numbers input from number buttons and dialed numbers to be sent out on a display panel. Telephone terminal devices with the above-mentioned additional functions can display or memorize the dialed digits entered through the numeric buttons for recall purposes, or convert information entered through the numeric buttons or other push buttons into regular dialed digits. It is necessary to have a built-in microprocessor to perform processing such as conversion and transmission, but in order to operate the microprocessor, the office power supply supplied from the affiliated automatic exchange via the telephone line is required. For example, it is necessary to use a local power supply supplied from a commercial power source and generated by a power supply device provided in the telephone terminal device.

It is necessary to insert an isolator, such as a photocoupler, into the joint between the part driven by the local power supply and the part driven by the local power supply, such as the dial pulse sending part, to electrically isolate the two parts. be.

It is strongly desired to reduce the required number of this type of isolators as much as possible in order to promote miniaturization and economicalization of the telephone terminal device.

[Conventional technology]

FIG. 3 is a diagram showing an example of a conventional power supply system.

In FIG. 3, processor 1 is connected to local power supply 2.
The dial pulse generating section 3 and the dial pulse sending section 4 are supplied with power via a telephone line 5 from a station power source provided in the affiliated automatic exchange (not shown).

In the dial pulse generator 3, one terminal 3i (i is 1 to 4) among the input terminals 31 to 34 and one terminal 3j (j is 5 to 7) among the input terminals 35 to 37 are short-circuited. Alternatively, by detecting that the two terminals 3i and 3j are each set to a logical high level potential, a predetermined dial pulse corresponding to the numbers "1" to "0" is generated,
It sends out to output terminals 38 and 39, and also sends out a dial pulse sending signal that continues during that time to output terminals 310 and 311.

Input terminals 3i and 3j [hereinafter (3i/3j)
] and the numbers “1” to “0” are (31, 35), (31, 36), (31, 3
7), (32,35), (32,36), (32,3
7), (33,35), (33,36), (33,3
7) and (34, 36) correspond to the numbers "1" to "0", respectively.

The dial pulse sending unit 4 receives dial pulses sent from the dial pulse generating unit 3 at input terminals 41 and 42 and sends them to the telephone line 5, and also sends out dial pulses transmitted from the dial pulse generating unit 3 in parallel. A medium signal is received at the input terminals 43 and 44, and operations such as disconnecting a telephone circuit (not shown) from the telephone line 5 are performed.

FIG. 4 shows the basic circuit configuration of the dial pulse sending section 4, and the same parts as in FIG. 3 are indicated by the same symbols. As shown in FIG. 4, connected telephone lines are typically terminated by a circuit such as telephone circuit 51. As shown in FIG. The dial pulse is sent out in this state, and the dial pulse from the dial pulse generation section 3 is input between the input terminals 41 and 42 of the dial pulse sending section 4.
0 is driven to cut off the current supplied from the telephone line 5 by the number corresponding to the dialed number. in this case,
If the current is intermittent in the loop circuit that passes through the telephone circuit 51, the current waveform will be distorted and the intermittent rate of dial pulses may change. Therefore, the telephone circuit 51 is disconnected or short-circuited while dial pulses are being sent out to prevent this effect. Measures will be taken.

In FIG. 4, input terminals 43 and 44 receive a dial sending signal from the dial pulse generator 3, which turns on before sending out a dial pulse and turns off after sending out a dial pulse, and a switch consisting of a transistor, etc. 420 is being driven to send out dial pulses, the telephone circuit 51 is short-circuited.

On the other hand, the key matrix 6 equipped with push buttons corresponding to numbers "1" to "0" has switching contacts 71
The dial pulse generating section 3 and the processor 1 are connected to each other via 77. As long as the local power supply 2 provided in the telephone terminal device is in a state where power can be supplied, the switching contacts 71 to 77 maintain their operating state.
In such a case, when any push button on the key matrix 6 is operated, the push button contacts 61 to 6 corresponding to the push button operated by the processor 1 are activated.
The closure of 0 is detected from the input terminals 11 to 17, and predetermined processing is executed.

The output terminals 101 to 107 of the processor 1 are
It is connected to the input terminals 31 to 37 of the dial pulse generator 3 via seven photocouplers 81 to 87. The photocouplers 81 to 87 serve as isolators that electrically isolate the processor 1 operated by the local power supply 2 from the dial pulse generator 3 operated by the local power supply.

When the processor 1 executes the process of sending dialed numbers etc. from the telephone terminal device to the affiliated automatic exchange, it connects a predetermined one of the photocouplers 81 to 84 via the output terminals 101 to 104 and output terminals 105 to 104. A predetermined one 8j of the photocouplers 85 to 87 is energized via the photocoupler 107. The two energized photocouplers 8i and 8j short-circuit the corresponding input terminals 3i and 3j of the dial pulse generator 3.
generates a corresponding dial pulse as described above, and transmits it to the telephone line 5 via the dial pulse transmitter 4.

Note that when the local power supply 2 becomes unable to supply power, the switching contacts 71 to 77 are restored and the key matrix 6
The input terminals 31 to 3 of the dial pulse generator 3
Connect to 7. In such a case, when a push button on the key matrix 6 is operated, the dial pulse generating section 3 directly detects the closure of the corresponding push button contacts 61 to 60, generates a corresponding dial pulse as described above, and dials the button. The pulse is sent to the telephone line L via the pulse sending unit 3.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in the conventional power supply system, the processor 1 has a local power supply 2.
Further, power was supplied to the dial pulse generator 3 and the dial pulse transmitter 4 from the office power supply via the telephone line 5.

As a result, the output terminals 101 to 1 of the processor 1
In order to separate the potential output from 07 from the input terminals 31 to 37 on the dial pulse generation section 3 side, it is necessary to provide photocouplers 81 to 87, respectively. There was a risk that miniaturization and economicization would be impaired.

[Means for solving problems]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 200 is a local power supply, 700 is a dial number input means for inputting dial number information, and 800 is operated by the local power supply 200, and relays or converts the dial number information input from the dial number input means. Dial numeral processing means for outputting, 100 input dial numeral information from the dial numeral input means 700 or the dial numeral processing means 800, and dial pulse generation means for generating a dial pulse corresponding to the dial numeral information; 500 a telephone; Dial pulse sending means 910 receives power from the station power source 400 via the line 300, receives dial pulses generated by the dial pulse generating means 100, and sends them to the telephone line 300; This is a first switching contact group for inputting the dial number information to the dial number processing means 800 when the local power supply 200 is in operation, and to the dial pulse generation means 100 when the local power supply 200 is stopped.

The present invention provides a telephone terminal device having the above-mentioned system, in which the dial pulse generating means 100 is switched and connected to the local power supply 200 when the local power supply 200 is in operation, and to the telephone line 300 when the local power supply 200 is stopped. 2 switching contact groups 920 are provided between the dial pulse generating means 100 and the dial pulse transmitting means 500, electrically insulating the dial pulses output from the dial pulse generating means 100, and the dial pulse transmitting means 500 is provided with an isolator 600 relaying to the terminal 500.

[Effect]

That is, according to the present invention, since the number of isolators 600 is inserted on the output terminal side of the dial pulse generating means 100, which is far fewer than the input terminal side, the number of isolators required can be significantly reduced, and the telephone terminal device can be made smaller. and promote economicization.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing a power supply system according to an embodiment of the present invention. In addition, in FIGS. 2 to 4, the same objects are indicated by the same symbols.

In FIG. 2, the dial pulse generator 3
is connected to the local power supply 2 via switching contacts 78 and 79.
It is also possible to supply power from the station power source via the telephone line 5, and between the output terminals 38 and 310 of the dial pulse generator 3 and the input terminals 41, 42, 43, 44 of the dial pulse transmitter 4. Photocouplers 88 and 89 are inserted between them, respectively.

Switching contacts 78 and 79 are switching contacts 71 to 7.
Similarly to 7, the operating state (the state shown in the figure) is maintained as long as the local power supply 2 provided in the telephone terminal device is in a state in which power can be supplied, and is restored when the local power supply 2 becomes in a state in which power cannot be supplied.

In either case, the dial pulse and the dial pulse sending signal output from the output terminals 38 and 310 of the dial pulse generating section 3 are electrically separated by photocouplers 88 and 89 and transmitted to the dial pulse sending section 4. Therefore, even if the dial pulse generator 3 is powered by the local power source 2, the dial pulse transmitter 4 is powered by the local power source (not shown) via the telephone line 5.
The dial pulse sending operation as described above is performed without any collision between the local power source 2 and the local power source. Incidentally, the internal configuration of the dial pulse sending means 4 which sends out dial pulses at this time is the same as that shown in FIG. 4.

On the other hand, as explained in the field of industrial use, the processor 1 is used to improve the functionality of telephone terminals, and implements a dial number processing means. In the case of FIG. 2, the output terminals 101 to 107 of the processor 1 are directly connected to the input terminals 31 to 37 of the dial pulse generator 3, and if the local power supply 2 is in a state where power can be supplied, they correspond to the dialed digits to be sent. and sets output terminals 10i and 10j to a logical high level, respectively. At this time, the processor 1 inputs input terminals 1i and 1j from the key matrix 6 which realizes dial number input means.
(For example, when the key 61 of the key matrix 6 is operated, 11 and 15) The dial number information inputted is stored in preparation for a re-call, and the input dial number information is displayed on a display panel (not shown). After performing necessary processing such as that, the output terminals 10i and 10j (101 and 105 in the above case) corresponding to the input dial number information are set to logical high levels, and the dial pulse generator 3 outputs the dial number information. Relay information. Further, if the series of dial digit information input from the key matrix 6 is abbreviated dial digits, it is analyzed, converted into dial digit information of a regular telephone number, and sent to the dial pulse generator 3. In addition, as described above, the processor 1 converts input information from the one-touch dial button and the recall button (not shown) into dialed numeric information of a regular telephone number and sends it to the dial pulse generator 3. It is also possible to perform processing such as the following.

The dial pulse generator 3, which is operated by the same local power supply 2 as the processor 1, has an input terminal 3i.
3j directly detects the logical high-level potential input from the processor 1, generates a number of dial pulses corresponding to the dial number information and outputs them from the output terminal 38, and turns on prior to sending out the dial pulses. , the output terminal 310 outputs the dial sending signal which turns off after sending the dial pulse.
Output from However, at this time, the dial pulse and dial sending signal output from the output terminals 38 and 310 are transmitted to the photocouplers 88 and 89.
Since the dial pulse generator 3 is electrically insulated from the local power source 2, even if the dial pulse generating section 3 is operating while receiving power from the local power source 2, the potential of the local power source 2 is not applied to the dial pulse sending section 4, which is operating while receiving power from the local power source. It will never be sent.

In addition, when the local power source stops supplying power, the switching contacts 78 and 79 are switched, so the dial pulse generator 3 receives power from the local power source (not shown) via the telephone line 5. , since the switching contacts 71 to 77 are also switched,
The dial number information is directly input from the key matrix 6 to the dial pulse generator 3. In this case, a logical high level is not input to the input terminal, and 2
Dial number information is input in such a way that the two input terminals 3i and 3j (for example, 31 and 35 when the key 61 of the key matrix 6 is operated) are short-circuited.
The dial pulse generator 3 receives 10 pulses from the processor 1.
Corresponding dial pulses are generated in the same manner as if logical high levels were input to i and 10j (101 and 105 in the above case).

As is clear from the above description, according to this embodiment, power can be supplied to the dial pulse generator 3 from either the local power source 2 or the local power source by switching the switching contacts 78 and 79, and the photocouplers 88 and 89 Since it is inserted between the dial pulse output terminal and dial sending signal output terminal of the generating section 3 and the input terminal of the dial pulse sending section 4, the output terminal 1 of the processor 1 as shown in FIG.
Compared to the case where photocouplers are inserted between the input terminals 01 to 107 and the input terminals 31 to 37 of the dial pulse generating section 3, the number of photocouplers required is significantly reduced.

Note that FIG. 2 is only one embodiment of the present invention, and for example, the isolator 600 is a photocoupler 88.
Although the present invention is not limited to 89 and many other modifications may be considered, the effects of the present invention remain the same in any case. Furthermore, the connection configuration among the processor 1, dial pulse generator 3, and key matrix 6 is not limited to that shown in the drawings.
Although many other modifications may be considered, the effects of the present invention remain the same in any case.

〔Effect of the invention〕

As described above, according to the present invention, the number of required isolators in the telephone terminal device is significantly reduced, thereby promoting miniaturization and economicalization of the telephone terminal device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a power supply system according to an embodiment of the present invention, and FIG.
The figure shows an example of a conventional power supply system.
The figure is a configuration diagram of a dial pulse sending section. In the figure, 1 is a processor, 2 and 200
3 is a local power supply, 3 is a dial pulse generator, 4 is a dial pulse sender, 5 and 300 are telephone lines, 6 is a key matrix, 11 to 17, 31 to 37, 41 to 44 are input terminals, 38, 39,
101 to 107, 310 and 311 are output terminals, 61 to 60 are push button contacts, 71 to 7
9 is a switching contact, 81 to 89 are photocouplers, 10
0 is the dial pulse generating means, 400 is the station power supply,
500 is a dial pulse sending means, 600 is an isolator, 700 is a dial number input means, 80
0 is dial number processing means, 910 and 920
is a switching contact group, 51 is a telephone circuit, 410 and 4
20 indicates a switch.

Claims (1)

[Claims] 1. Operated by a dial number input means 700 for inputting dial number information and a local power supply 200,
dialed number processing means 800 which relays or converts and outputs dialed number information input from said dialed number input means; and dialed number information inputted from said dialed number input means or said dialed number processing means, and said dialed number information. a dial pulse generating means 100 that generates dial pulses corresponding to the dial pulses; and a dial pulse that receives power from a local power source 400 via a telephone line 300, receives dial pulses generated by the dial pulse generating means, and sends the received dial pulses to the telephone line. Sending means 500;
a first switching contact group 910 for inputting the dial number information output from the dial number input means to the dial number processing means when the local power supply is in operation and to the dial pulse generation means 100 when the local power supply is stopped; A second switching contact group 920 that switches and connects the dial pulse generating means to the local power supply when the local power supply is in operation and to the telephone line when the local power supply is stopped.
and an isolator 600 between the dial pulse generating means and the dial pulse transmitting means, which electrically insulates the dial pulse output from the dial pulse generating means and relays it to the dial pulse transmitting means, A power supply system characterized in that a dial pulse outputted from a generating means is sent to a dial pulse sending means via an isolator.