JPH05199334A - Line circuit for private branch of automatic exchange - Google Patents

Abstract

PURPOSE:To prevent an entire rush current of the private branch of automatic exchange from being concentrated in a short time by sharing timing in line circuits accommodated in the private branch of automatic exchange depending on each line circuit so as to start feeding to a terminal equipment. CONSTITUTION:It is attained that feeding to a terminal equipment 2 is controlled by a feeding circuit 3 by an instruction of a central processing unit 4 of a line circuit 1 and a mount position detection circuit 6 and a clock circuit 5 are used to revise a timing of starting feeding to the terminal equipment for each line circuit thereby starting the feeding to the terminal equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line circuit of an automatic private branch exchange, and more particularly to an inrush current limiting circuit system.

[0002]

2. Description of the Related Art In a conventional line circuit power supply circuit system, power supplied from a power source of an automatic private branch exchange is supplied to a terminal as it is.

[0003]

In this conventional line circuit feeding circuit system, since the power supplied from the power supply of the automatic private branch exchange is supplied to the terminal as it is, when the power of the automatic private branch exchange is turned on, the automatic private branch exchange is turned on. Since electric power is supplied all at once to the terminals connected to the line circuit of the exchange, there is a problem that a large inrush current flows, a large load is applied to the power supply of the automatic private branch exchange, and the fuse is blown.

An object of the present invention is to provide a line circuit for an automatic private branch exchange that reduces the load on the power supply of the automatic private branch exchange.

[0005]

In order to achieve the above object, a line circuit of an automatic private branch exchange according to the present invention includes a power supply circuit, a mounting position detection circuit, a clock circuit, and a central processing unit. , The line circuit accommodated in the automatic private branch exchange, the power supply circuit controls the power supply from the power supply of the automatic private branch exchange to the terminal, and the mounting position detection circuit is the line circuit of the automatic private branch exchange. The clock circuit detects the mounting position, and the clock circuit measures the power supply start time according to the mounting position.The central processing unit supplies the clock circuit with the mounting position according to the mounting position detected by the mounting position detection circuit. The start time is set and the timing is changed for each line circuit to control the power supply to the terminal by the power supply circuit.

[0006]

The power supply load of the automatic private branch exchange is reduced by changing the timing for each line circuit of the automatic private branch exchange and starting power supply to the terminal.

[0007]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, a line circuit 1 supplies power supplied from a power supply 7 of an automatic private branch exchange to a terminal 2 via a power supply circuit 3.

The power supply circuit 3 is in a state in which power is not supplied to the terminal 2 when the line circuit 1 is not operating.

When the line circuit 1 becomes operable, the central processing unit 4 of the line circuit 1 detects the mounting position of the line circuit 1 on the automatic private branch exchange by the mounting position detection circuit 6, and the detected mounting position. In accordance with this, the power supply start time at the predetermined mounting position is set in the clock circuit 5.

When the clock circuit 5 notifies the central processing unit 4 of the line circuit 1 that the power supply is started, the central processing unit 4 controls the power supply circuit 3 to supply power to the terminal 2.

[0012]

As described above, according to the present invention, the timing is changed for each line circuit of the automatic private branch exchange to start the power supply to the terminal. Therefore, an inrush current is generated in each line circuit, and the automatic private branch exchange. It has an effect that the maximum inrush current of the whole can be suppressed low.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 line circuit 2 terminal 3 power supply circuit of line circuit 4 central processing unit of line circuit 5 clock circuit of line circuit 6 mounting position detection circuit of line circuit 7 power supply of automatic private branch exchange

Claims (1)

[Claims] 1. A line circuit that has a power supply circuit, a mounting position detection circuit, a clock circuit, and a central processing unit and is housed in an automatic private branch exchange, wherein the power supply circuit is a power source of the automatic private branch exchange. The power supply to the terminal is controlled, the mounting position detection circuit detects the mounting position of the line circuit on the automatic private branch exchange, and the clock circuit measures the power supply start time depending on the mounting position. Yes, the central processing unit sets the power supply start time in the clock circuit according to the mounting position detected by the mounting position detection circuit, and changes the timing for each line circuit to control the power supply to the terminal by the power supply circuit. A line circuit of an automatic private branch exchange, which is characterized by being