JPS63151193A - Key telephone set - Google Patents

Abstract

PURPOSE:To reduce a working current and a direct current resistance for a micro-current at the time of the power failure of a commercial power source by providing a relay, which is operated by the direct current loop current of a dial transmitting part at the time of dialing and builds up a speaking circuit and a direct current circuit by coming to ON except at the time of dialing. CONSTITUTION:When the commercial power source fails, the power failure mode switching part 1g of a main device 1 is switched, and a key telephone set 20 is directly connected to trunk lines L1, L2. A power source part 27 for power failure converts a power supply from a station exchange, and a controlling part 28 for power failure is operated by this power supply. Then, when the dialing ten key of a key matrix 29 is operated, a dial transmitting part 22 is driven, and further, a transistor (TR) Tr is made to ON, and the reed relay EL1 of the dial transmitting auxiliary part 23 is made to operate by the direct current loop current of the dial transmitting part 22. On the other hand, except at the time of dialing, because the reed relay RL1 does not operate and a relay contact rl is closed, a resistor (r) and the relay contact rl are connected to the speaking circuit 24 in parallel at the time of the off-hook of a hand set 8, and the direct current circuit is built up.

Description

[Detailed description of the invention] Industrial applications TECHNICAL FIELD The present invention relates to a key telephone set with measures against power outages.

2. Description of the Related Art In recent years, button telephones have been improved in functionality and reduced in cost using ICs, LSIs, and microcomputers.

Figure 2 shows vehicle installation r1! , 1 and a conventional button telephone 2 connected to this main device 1, the main device IK is powered from a commercial power source.

In the above configuration, while the commercial power supply is on, the power supply section 1a of the main device 1 generates power for operating the system of the button telephone 2 using the commercial power supply, and this power supply is supplied to the telephone power supply/data communication section 1f, The signal is supplied to the key telephone 2 via the H-L line.

On the other hand, when the commercial power supply fails, the power outage mode switching section 1g does not switch as shown by the solid line in the figure, and the button telephone 2 is disconnected from the link switch (SW) section 1d and the call circuit/talk current supply circuit 1e. It is directly connected to the central office line 8, L2 4, and therefore operates as an independent telephone set using the central office power supply.

FIG. 3 shows a conventional button telephone 2. When the commercial power supply is on, power is supplied from the main device 1 shown in FIG. 13, it is converted into a power supply for the button telephone 2 4, and the control unit 1 for when the power is turned on
4 and the amplifier 15 of the speaker 16.

On the other hand, when the commercial power supply is out of power, the energized power supply section 13,
The energization control unit 14, amplifier 15, speaker 16, and data communication unit 17 stop operating, and the station power is supplied via the TR line.

This local power supply is supplied to a power outage control section 10 via a rectifier section 4, which is generally composed of a diode bridge and has a high resistance in the case of minute currents, and a power outage section 9. 10, when a key human input signal from the key matrix section 12 is input, drives the dial sending section 5 and dials the central office line L2 shown in FIG.

In the case of the above-mentioned central office line call, the reed relay RL monitors whether or not dialing is in progress; during dialing, the relay contact rL-1 of the dial sending auxiliary unit 6 connected in parallel to the telephone call circuit 7 closes; A relay contact rl-2 connected in series with the resistor r and in parallel with the rectifier 4 is connected to open.

In addition, when the reed relay RL is not dialing, the relay contact r1. -1 is open and relay contact rt-2 is closed, and resistor r and relay contact rL-2 are connected to handset 8.
When off-hook, it is connected in parallel with the communication circuit 7 to form a DC circuit. Therefore, the resistance r and the relay contact rl-
2 reduces DC resistance in minute currents.

As mentioned above, during a call when the commercial power supply is out of power, the resistor r, relay contact rt-2, and call circuit 7 form a DC circuit, and the button telephone 2 can operate as an independent telephone.

FIG. 4 shows another conventional button telephone 2a, in which a resistor r
The relay RL and relay RL are removed from the button telephone 2 shown in FIG. 3, and the DC circuit is configured only by the communication circuit 7. Note that the other constituent circuits are the same as those shown in FIG. 3, so their explanation will be omitted.

Problems to be Solved by the Invention However, the conventional button telephone set shown in FIG. 3 uses a relay RL for monitoring dial operations, and therefore has the problem of using excess current.

In addition, in the conventional button telephone shown in FIG. 4, the current consumption can be reduced because the relay RL is not used, but the rectifier 4 has a high resistance in the case of minute currents, and the DC resistance is determined by the rectifier 4. Circuit (relay contact rL-2, resistance r
) is not located closer to the central office than the rectifier 4, it is difficult to reduce the direct current resistance in minute currents, and therefore it is prohibited to connect to a central office exchange that has restrictions on direct current resistance in minute currents, which violates the standard. There is a problem.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a button telephone that can reduce the current used during a power outage of the commercial power supply, and can also reduce the direct current resistance in the case of minute currents.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention operates with a DC loop current in the dial of the dial sending section, and the contacts are connected to the peripheral side of the rectifier circuit, and the contacts other than the dial are connected to the peripheral side of the rectifier circuit. It is characterized by having a relay that is turned on at certain times to form a communication circuit and a DC circuit.

Function The present invention operates the reed relay using the DC loop current in the dial of the dial sending unit, so it is possible to reduce the current used during a power outage of the commercial power supply. , it is possible to reduce DC resistance in minute currents.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1st
FIG. 1 is a block diagram showing an embodiment of a button telephone according to the present invention.

In FIG. 1, 1 is a main device having the same configuration as the main device shown in FIG. 2, and 20 is a button telephone handle connected to the main device 1. In FIG.

In the button telephone 20, rL is a relay contact of a reed relay RL, which will be described later, r is a resistor connected in series to the relay contact rL, and the relay contact rl and the resistor r,
are connected in parallel to a communication circuit 24, which will be described later. As will be described later, this relay contact rt is open during dialing and closed when dialing is not in progress.

Reference numeral 21 denotes a rectifier for rectifying outgoing/incoming voice signals, 22 a dial sending unit for outgoing calls, and 23 a dial sending auxiliary unit that assists the dial sending unit 22 when the commercial power supply is out of power. This dial sending auxiliary unit 23 is configured by a series connection of a reed relay RL and a transistor Tr, and is connected in parallel to the telephone call circuit 24, and the pace of the transistor Tr of the dial sending auxiliary unit 23 is controlled in the event of a power outage. 28.

25 is a handset equipped with a transmitter and a handset; 26 is a ring tone generating unit; 27 is a power supply unit for use during a power outage that converts the power sent from the central office exchange into power for the button telephone 20 during a power outage; 28 is a power outage control unit that operates during a power outage,
Reference numeral 29 denotes a key matrix section consisting of a numeric keypad for inputting a dial number, a key for selecting a central office line, and the like.

Reference numeral 30 denotes a power supply section for when energizing, for converting the power supplied from the main device 1 into power for the button telephone 20 when energized;
Reference numeral 1 denotes an energization control unit that operates when the energization is applied; 32 an amplifier that amplifies the ringtone audio signal and the incoming call audio signal; 3
3 is a speaker that converts the audio signal from the amplifier 32 into audio, and 34 is a data communication unit that performs digital communication with the main device 1.

Next, the operation of the embodiment according to the above configuration will be explained.

First, while the commercial power supply is on, the power failure mode switching section 1g
are connected as shown in the broken line, and the power supply is from main device 1 to T.
- is supplied to the button telephone 20 via Ri.

The power supplied from the main device 1 via the H-L line is converted into power for the button telephone 20 by the energizing power supply section 30, and is converted into power for the button telephone 20 by the energizing power supply section 30 and the amplifier 3 of the energizing control section 31 and the speaker 33.
2.

Data communication between the main device 1 and the key telephone 20 is carried out by the second
As shown in the figure, the control section 1b of the 5+C1 main device 1, the telephone power supply/data communication section 1f, the I(-L line),
Further, a call is made via a link switch (SW) section 1d, a call circuit/talk current supply circuit 1e, a power outage mode switching section 1g connected as shown by the broken line in the figure, and a TR line. Audio signals such as ringtones are sent to the tone circuit 1c of the main device 1.
and reproduced by the key telephone 20.

On the other hand, when the commercial power supply is out of power, the power outage mode switching section 1g of the main device 1 is switched as shown by the solid line in the figure.
The button telephone 20 includes a link switch (S) shown in FIG.
W) section 1d is separated from the communication circuit/communication current supply circuit 1e and directly connected to the central office lines 0 and L2.

When directly connected to station line 1, L2, power supply section 2 for power outage
7 converts the power from the central office exchange, and the power outage control unit 28
is operated by this power supply.

When the dial numeric keypad of the key matrix 29 is operated, the power outage control unit 28 drives the dial sending unit 22 and turns on the transistor Tr. therefore,
Dial sending auxiliary unit 23 (7) IJ-Dolly relay RL
, operates with the DC loop current of the dial sending section 22.

On the other hand, when dialing is not in progress, reed relay RL does not operate and relay contact RL closes. Therefore, the resistor r and the relay contact rL are connected in parallel with the communication circuit 24 when the handset 8 is off-hook, forming a DC circuit.

As mentioned above, during a call when the commercial power supply is out of power, the resistor r and the relay rl1 communication circuit 24 form a DC circuit, and therefore, a DC circuit is formed on the station line side of the rectifier 210, which has a high resistance for minute currents. As a result, direct current resistance at the time of minute currents can be reduced, making it possible to make calls during a power outage regardless of the type of central office exchange.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention operates with a DC loop current in the dial of the dial sending section, the contact is connected to the office line side of the rectifier circuit, and is turned on when not dialing. Equipped with a relay that forms a communication circuit and a DC circuit, it is possible to reduce the current used during a commercial power outage, and
It is possible to reduce DC resistance in minute currents.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the button telephone according to the present invention, FIG. 2 is a block diagram showing a main device to which the button telephone of FIG. 1 is connected, and FIGS. 3 and 4 are FIG. 3 is a block diagram showing a conventional example. 1... Main device, 1g... Power outage mode switching unit, 2
0... Button telephone, 21... Rectifier, 22...
Dial sending section, 23...Dial sending auxiliary section, 24
...Telephone circuit, 27...Power supply section for power outage, 28...
・Control unit for power outage, 29...Key matrix unit, RL
,...Reed relay, re...Relay contact.

Claims (1)

[Claims] A button telephone that is operated by the DC loop current during dialing in the dial sending unit, and has a reed relay whose contacts are connected to the office line side of the rectifier circuit and which is turned on when not dialing to form a call circuit and a DC circuit. .