JPH0245878B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a telephone circuit switching control method for switching the telephone circuit between power supply and power outage in a button telephone device or the like that operates by being supplied with power from a commercial power supply. It is.

Prior Art and Problems In key telephone devices, etc., multiple extension telephones are connected via a connection control device connected to a central office line, and the connection control device operates by being supplied with power from a commercial power source. It is something to do. For example, as shown in FIG. 1, a connection control device NT is connected to a central office line L, and a plurality of telephones TEL1 to TELn are selectively connected via this connection control device.
This connection control device NT sends out ring tones and hold tones for incoming calls from external lines and extensions, and also connects telephones TEL1 to TELn corresponding to extension numbers using thyristor switches or the like. In order to perform such connection control, AC 100V
It is powered by a commercial power source. but,
Since it would be a problem if the telephone could not receive or make calls at all in the event of a power outage, a configuration is adopted in which the connection control device NT is bypassed with a bypass path BP as shown by the dotted line, and the telephone is switched to receive power from the central office.

FIG. 2 shows a block diagram of the main parts of the above-mentioned conventional connection control device and telephone set, where L1 and L2 are central office lines, 1a and 1b are first switching contacts, and 2a and 2b are second switching contacts. , 3 is a connection control device, 4 is a telephone, 5 is a diode bridge, 6 is a circuit including a thyristor switch and has functions such as sending out a ring tone and detecting off-hook of the telephone, 7 is a diode bridge, and 8 is a telephone It is a circuit network.

The connection control device 3 is operated by being supplied with power from an AC 100V commercial power source, and while power is being supplied from the commercial power source, the switching contacts 1a, 1b and 2a, 2b are switched to the states shown in the figure, and the station lines L1, To L2,
A circuit network 8 of the telephone set is connected via the diode bridge 5, the circuit 6, and the diode bridge 7 of the telephone set 4, and power is supplied from the connection control device 5 to the telephone set 4 to perform a telephone conversation.

In addition, when the commercial power supply is interrupted, switching contacts 1a and 1b
and 2a, 2b are switched so as to bypass the connection control device 3. Therefore, the station lines L1, L2
Then, a circuit network 8 is connected through the diode bridge 7 of the telephone 4, and the telephone 4 becomes operable by the local power supply.

The diode bridge 5 of the connection control device 3 is for eliminating the need to consider connection polarity when connecting the connection control device 3 to the office lines L1 and L2.
The diode bridge 7 of the telephone 4 also
This is to eliminate the need to consider the connection polarity when connecting to the connection control device 3 and the station lines L1 and L2.

However, when power is being supplied from a commercial power source,
Since two diode bridges 5 and 7 are connected to each other, there is a drawback that the impedance caused by these diode bridges 5 and 7 increases call loss.

Purpose of the Invention The purpose of the present invention is to prevent an increase in call loss by connecting only one diode bridge to a central office line even during a commercial power outage and during power supply. be.

Composition of the Invention The present invention provides a connection control device that includes a diode bridge and a thyristor switch and operates by being supplied with power from a commercial power supply, and a first and second connection control device that switches whether the connection control device is connected to a central office line or bypassed. a telephone set including a second switching contact, a diode bridge, a circuit network, and a third switching contact for switching between connecting or bypassing the diode bridge to the circuit network, and controlling the connection from the commercial power source. While power is being supplied to the device, the first and second switching contacts are switched to connect the central line to the diode bridge of the connection control device and connect the connection control device to the telephone, and the telephone The third switching contact is switched so as to bypass the diode bridge of the telephone; and when the commercial power supply is out of power, the first and second switching contacts are switched so as to bypass the connection control device; The third switching contact is switched to connect a diode bridge to the circuit network, and only one diode bridge is connected to the central office line. Examples will be described in detail below.

Embodiment of the invention FIG. 3 is a block diagram of the main part of an embodiment of the invention, in which L1 and L2 are central lines, 11a and 11b are first
switching contacts, 12a and 12b are second switching contacts,
19a and 19b are third switching contacts, 13 is a connection control device, 14 is a telephone set, 15 and 17 are diode bridges, 16 is a circuit including a thyristor switch, etc., and 18 is a telephone circuit network. While power is being supplied to the connection control device 13 from the commercial power source, the first, second and third switching contacts 11a, 11b, 12a, 12b and 19a, 19b are switched to the state shown in the figure, and the central lines L1 and L2 are The diode bridge 15 of the connection control device 13 is connected, and the diode bridge 17 of the telephone 14 is connected to the third switching contact 19a,
19b, and the telephone circuit network 18 is directly connected to the connection control device 13. The network 18 is therefore connected via one diode bridge 15 to the central lines L1, L2.

Also, if the commercial power supply fails, the 1st, 2nd, and 3rd
The switching contacts 11a, 11b, 12a, 12b and 19a, 19b are switched from the illustrated state,
First and second switching contacts 11a, 11b, 12
a, 12b, the connection control device 13 is bypassed, and the third switching contact 19 is directly connected to the central office lines L1, L2.
a, 19b are connected, and this switching contact 19a, 1
9b connects the diode bridge 17, so that the network 18 is connected to one diode bridge 1
7 to the central office lines L1 and L2.

It is already known that the connection control device 13 is provided with a function of detecting a power outage of the commercial power supply, and the first, second and third switching contacts 11 are activated by the power outage detection.
a, 11b, 12a, 12b and 19a, 19b
Of course, it is also possible to perform switching control. In that case, it can be easily realized by using a six-contact relay. It is also possible to switch manually during a power outage.

Effects of the Invention As explained above, the present invention provides that, while power is being supplied to the connection control device 13 from a commercial power source, the office lines L1 and L2 are connected to the diode bridge 15 of the connection control device 13.
and the first and second switching contacts 11a, so as to connect the connection control device 13 to the telephone 14.
11b, 12a, 12b, and also switches the third switching contacts 19a, 19b so as to bypass the diode bridge 17 of the telephone 14, and in the event of a power outage of the commercial power supply, the connection control device 13
The first and second switching contacts 11a, 11b, 12a, 12b are switched so as to bypass the diode bridge 17 of the telephone 14.
The third switching contacts 19a and 19b are switched to connect the telephone 14 to the circuit network 18, and the telephone 14 is connected to the telephone 14 through the diode bridge 15 when the power is energized to the central office line, and through the diode bridge 17 during a power outage. Since the circuit network 18 is connected, there is only a call loss due to one diode bridge, which has the advantage of being able to reduce call loss compared to the conventional example. The advantage is that the levels are almost the same.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a button telephone device, FIG. 2 is a block diagram of essential parts of a conventional connection control device and a telephone, and FIG. 3 is a block diagram of essential parts of an embodiment of the present invention. L1 and L2 are central lines, 11a and 11b are first switching contacts, 12a and 12b are second switching contacts, 19
a, 19b are third switching contacts, 13 is a connection control device, 14 is a telephone, 15, 17 is a diode bridge, 16 is a circuit including a thyristor switch, etc.
18 is a telephone circuit network.

Claims (1)

[Claims] 1. A connection control device including a diode bridge and a thyristor switch, which operates by being supplied with power from a commercial power source, and first and second switching contacts that switch whether the connection control device is connected to the central office line or bypassed. , a telephone set including a diode bridge, a circuit network, and a third switching contact for switching whether to connect or bypass the diode bridge to the circuit network, and while power is being supplied to the connection control device from the commercial power source, connecting the central office line to a diode bridge of the connection control device and switching the first and second switching contacts to connect the connection control device to the telephone set, bypassing the diode bridge of the telephone set; When the commercial power supply fails, the first and second switching contacts are switched to bypass the connection control device, and the diode bridge of the telephone is switched to A telephone circuit switching control system characterized in that the third switching contact is switched to connect to a circuit network.