JPS648517B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply system for a private automatic branch exchange equipped with a relay stand.

2. Description of the Related Art Conventionally, private automatic branch exchanges have been known that are equipped with a relay stand and can switch the relay system between a distributed system and a relay stand system. The power supply to the exchange main body and the relay stand is generally carried out in a concentrated manner from a rectifying means and a storage battery provided in the exchange main body.

Therefore, a power supply line was required between the exchange main unit and the relay stand, and a large storage battery was required in case of a power outage, so it was difficult to connect, especially when installing multiple relay stands. An increase in the number of wires and an increase in the size of the switch were unavoidable.

The present invention has been devised in view of this point, and it is an object of the present invention to provide an automatic private branch exchange in which the number of connection lines between the exchange main body and the relay stand can be reduced, and the exchange main body can be made compact. Hereinafter, the present invention will be explained in detail with reference to embodiments of the drawings. The figure is a block diagram of a power supply system according to the present invention, and parts not directly related to the present invention are omitted. Reference numeral 1 denotes an exchange main body, and 2 a central line relay board, which are connected by a communication line 1a and a control line 1b. 3 and 4 are power outage monitoring circuits, 5 and 6
1 is a rectifier power supply device, 7 and 8 are storage batteries, 9 and 10 are switching control circuits, 11 is an exchange circuit, 12 is a relay board circuit, and 13 is a communication circuit. Power outage monitoring circuit 3,
4 are each connected to a commercial power supply (AC100V),
The commercial power supply is connected to the rectifier power supply devices 5 and 6, and a power outage of the commercial power supply is monitored, and is configured in the same manner as a conventional power outage monitoring circuit. The rectifier power supply device 5 and the storage battery 7 are used to supply power to the main body of the exchanger, and their capacity may be smaller than that for conventional centralized power supply. The exchange circuit 11 includes call path switches, trunks, and the like. The rectifier power supply device 6 and the storage battery 8 are used to supply power to the relay stand 2, and their capacity may be extremely small. The relay board circuit 12 includes a lamp display circuit, etc.
It is configured in the same way as a conventional relay board circuit, and the call circuit 1
It is connected to the exchange main body 1 via 3.

The switching control circuit 9 is a switching means for switching the relay system from the relay system to the distributed system, and is configured in the same way as a conventional circuit. Switching control circuit 10
is a switching circuit for maintaining the minimum necessary functions in the event of a power outage (maintaining a line in use, stopping new calls, etc.), such as disconnecting the lamp lighting circuit of the relay board circuit 12, and a communication switch between the relay board and the relay board circuit 12. It consists of circuits that detect the state.

Next, the operation will be explained.

If only the commercial power supply (AC 100 V) of the relay stand 2 is out of power, the power outage monitoring circuit 4 detects this and provides its detection output to the switching control circuit 10. The switching control circuit 10 controls the rectifier power supply device 6 and switches the power supply to each circuit of the relay stand 2 to the storage battery 8.
Further, the switching control circuit 10 detects the call status of the relay board circuit 12 and sends switching information to the switching control circuit 9 of the exchange main body 1 so as to switch to the distributed system for the office lines that are not in use. Therefore, it becomes impossible for the relay stand 2 to respond to new incoming calls. When the central office line call in progress is completed, the switching control circuit 10 sends switching information to the switching control circuit 9 of the exchange main body 1 each time, and all central office lines are switched to the distributed system. Since the storage battery 8 only needs to supply power until the telephone call is terminated and to the switching control circuit 10 and the like until the power is restored, an extremely small capacity battery is sufficient.

When the commercial power supply to the relay stand 2 is restored, this is detected by the power outage monitoring circuit 4 and the detection output is given to the switching control circuit 10, so that the rectifier power supply device 6 and the relay stand circuit 12 are switched to the normal state. Further, the switching control circuit 10 sends the above-mentioned power restoration detection output to the switching control circuit 9 of the exchange main body 1. As a result, the switching control circuit 9 switches the other office lines except the one currently in use to the relay stand system, and sequentially switches all the office lines to the relay stand system, contrary to what happens at the time of a power outage. The switching operation in the exchange main body 1 at this time is the same as the operation in a conventional exchange.

Next, when the commercial power supply of the exchange main body 1 is interrupted, the power failure monitoring circuit 3 detects this and provides the detection output to the switching control circuit 9. As a result, the switching control circuit 9 controls the rectifier power supply device 5 and switches the power supply to the storage battery 7. At this time, if power outage information is not sent from the relay stand 2, the relay stand method is continued as is. That is, the switching control circuit 9 is configured so that switching of the exchange circuit 11 is not performed. Therefore, the switching control circuit 9 is similar to the conventional circuit, but the switching control for the exchange circuit 11 is configured to be activated by power outage information from the switching control circuit 10 of the relay stand 2.

When the power is restored after the power outage, the switching control circuit 9 sends a control signal to the rectifier power supply device 5 in order to change the power supply from the storage battery 7 to the rectifier power supply device 5 . When the commercial power supply to the exchange main body 1 is out of power, and the commercial power supply to the relay board 2 is also out of power, the above-mentioned switching operation of the switch main body 1 and the above-mentioned operation when only the commercial power supply to the relay board 2 is out of power are performed. I think you can understand that this is done by adding .

As explained above, the present invention provides a private automatic branch exchange equipped with a relay board and a switching means for switching the relay method between a distributed method and a relay method, in addition to a rectifying means and a storage battery provided in the exchange main body. A rectifying means, a storage battery, and a power failure monitoring means for supplying power to the relay stand are provided in the relay stand, and the switching means is controlled by the operation of the power failure monitoring means, so that the exchange main body and the relay stand are powered from separate storage batteries. As a result, a small capacity power source such as a storage battery in the exchanger body is sufficient, and the exchanger body can be made compact. Further, since a power supply line between the relay stand and the relay stand is not required, there are significant practical effects such as a reduction in the number of connection lines.

[Brief explanation of drawings]

The figure is a block diagram of a power supply system according to the present invention. 1... Exchange main body, 2... Central line relay board, 3, 4
...Power failure monitoring circuit, 5, 6... Rectifier power supply device,
9, 10...Switching control circuit, 11...Switching circuit, 12...Relay board circuit.

Claims (1)

[Claims] 1. In a private automatic branch exchange equipped with a relay board and a switching means for switching the relay method between the distributed method and the relay method, in addition to the rectifier and storage battery provided in the main body of the exchange, there is a rectifier for supplying power to the relay board. Install means, storage batteries, and power outage monitoring means on the relay stand,
A power supply system for a private automatic branch exchange, characterized in that the switching means is controlled by the operation of the power outage monitoring means, so that the exchange main body and the relay stand are supplied with power from separate storage batteries.