JPS61269553A - Terminal equipment power supply system - Google Patents

Abstract

PURPOSE:To reduce power consumption at a nonoperation by operating a power supply switch provided to a supply load potential depending on the start either of a pre-stage or a subsequent device. CONSTITUTION:An OR circuit 46 for start signals from the pre-stage device or the subsequent device and a power switch circuit 47 are provided, a detection signal is sent from a station power supply circuit 13 to the circuit 46 when the pre-stage device is started and its output turns on a switch 47 to supply power to each device. When the subsequent device is started, the closed loop of connection ports 23, 24 is detected by a start detection circuit 14 to send a start signal to the circuit 46 and turn on the switch 47. In order to detect the start from the subsequent device, an interface power supply is supplied but the subsequent device is started and then the loop is closed, then a current flows for the case only and the power consumption at the nonoperation is reduced.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a terminal control device connected to a digital subscriber line, and a terminal device power supply system for reducing WK non-active power consumption. It is.

[Background of the invention]

In the conventional power supply system for a terminal device, power is constantly supplied from two power sources: a power source for an interface with a front or rear device, and a power source for operating the terminal. Therefore, there is a problem in that power is supplied to various parts of the terminal even when the terminal is not in operation, resulting in wasted power.

Incidentally, a related publicly known method is JP-A No. 58-40968.

[Purpose of the invention]

An object of the present invention is to provide a terminal device that can reduce power consumption during non-operation by using a power supply switch that operates upon detecting activation from a preceding or succeeding device.

[Summary of the invention]

In conventional power supply systems for terminal devices, two types of power are always supplied: a power source for interfacing with the front or rear device, and a power source for operating the terminal, but of the two, only the power source for the interface is supplied when the terminal is not in operation. Is required. In the present invention, in order to reduce power consumption when the terminal is not in operation, a switch is used to operate the power supply that operates the terminal only when the terminal is started.

[Embodiments of the invention]

Figure 1 shows the connection form between digital home equipment and an exchange. 1 is a digital exchange, 2 is a digital subscriber line, 3
is a well-known DSU (DigitalServi
ce Unit) 4 and 5 are extensions, 6 is this terminal device,
8 is a digital telephone or non-telephone device.

This device is located after D8U No. 3, and high-speed information supplied from extension No. 4 and low-speed information supplied from extension No. 5 are sent from D8U. This device has the function of controlling the path between the information sent from 4.5 and the telephone built into the device or a plurality of terminal devices connected later.

A block diagram of a conventional terminal device is shown in FIG.

9.10 is an interface circuit that performs frame synchronization, frame disassembly, and assembly; 11 is a control circuit; 12 is a startup circuit for notifying the preceding device of activation; 13 is a station power supply circuit; A startup detection circuit that detects startup, 15 is a power supply circuit for the rear device, 16 is a power supply circuit for commercial power supply, 17 is an addition circuit, 18 is a connection plug for commercial power supply, and 19 to 22 are connections with the front device. Boats 23 to 26 are connection boats with rear devices.

This terminal is connected to the front and rear devices through a total of four wires, two transmitting wires and two receiving wires, and activation is performed by applying DC voltage to two of these wires and detecting it. .

When the DSU starts up while the Act source is being supplied from the program 18, the 13 station power supply circuits are started, and power is supplied to each section to operate each section. 1 in the control circuit 11 when starting the downstream device.
This is done by driving the interface circuit No. 0, operating the power supply circuit No. 15 to apply voltage to the downstream device, and activating the connection ports 23 to 26 with the downstream device. When starting from the rear device, set the startup from the rear device to 14.
The activation detection circuit detects this and drives the 15 power supply circuits.

When the activation from the rear device is detected, the control circuit 11 starts 9.
The interface circuit is driven, the 12 activation circuits are operated, and the activation is notified to the preceding device.

In this way, this terminal device performs connection control between the preceding device and the succeeding terminal device. Although FIG. 2 shows a case in which there is one interface circuit for each of the front and rear devices, it is also possible to configure a plurality of interface circuits for each. It is also possible to add a telephone function to this terminal device.

When starting from this device, although not detailed in this figure, the control circuit detects the depression of a start button or the like and operates the start circuit 12 through the interface circuit 9.

FIG. 3 shows an example of the configuration of the 16 power supply circuits shown in FIG. 2. 27
1 is a voltage conversion transformer, and 28 to 31 and 32 to 55 are rectifying elements, each of which constitutes a full-wave rectifier circuit. 36
．． 38 is a resistance element, 37.39 is a capacitor, 3
6.57 and 38.59 constitute a smoothing circuit, respectively. 40.41 is the connection terminal for AC commercial power supply, 42
．． 43 and 44.45 are DC output terminals after voltage conversion.

In order to operate this device, two power sources must be constantly supplied: a power source for operating this device (hereinafter referred to as power source 1) and a power source for interfacing with the downstream device (hereinafter referred to as power source 2). However, since power is consumed even when not in operation, it is necessary to suppress this as much as possible.

The present invention relates to one configuration method for reducing power consumption during non-operation. It is characterized in that only the power source 2 is constantly supplied with power, and the power source 1, which consumes most of the power when not in operation, is applied only during operation.

FIG. 4 shows a block diagram of the present invention. The same numbers as in FIG. 2 indicate the same product names. The difference from Figure 2 is 46.47
This is the addition of . 46 is an OR circuit for activation signals from the front and rear devices, and 47 is a switch circuit for the power supply 1.

When the previous device starts up, a detection signal is sent from the 130-station power supply circuit to the OR circuit 46, and the output of the OR circuit 46 turns on the switch 47 to supply power to each part of the device. When starting from the downstream device, the connection baud with the downstream device is detected by the 14 startup detection circuits that close the loop at 25.24, a startup signal is sent to the OTL circuit at 46, and the startup signal is sent to the OTL circuit at 47.
Turn on the switch.

In order to detect activation from a downstream device, the interface power supply 2 must be constantly supplied, but current flows only when activation is applied from the downstream device and the loop is closed, so it is inactive. The power consumption at the time can be extremely reduced.

FIG. 5 shows a configuration example of 46 OR circuits and 47 switch circuits. 48 is a photocoupler for detecting activation from the rear device, 49 is a photocoupler for detecting activation from the front device, 50 to 54 are resistive elements, 55.56 is a rectifying element of an OR circuit, and 57 is a power supply. Switch transistor, 5
8.59 is the input terminal of the power supply 1 from the 16 power supply circuit in FIG. 4, and 60.61 is the output terminal of the power supply 1 which supplies power to each part of the apparatus.

〔Effect of the invention〕

According to the present invention, in a conventional terminal device power feeding system,
By activating the power supplied to each part of the terminal, which accounts for most of the power consumption during non-operation, only when the terminal device is in operation, the power consumption during non-operation can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a digital subscriber system for explaining an embodiment of the present invention, FIG. 2 is a block diagram of a conventional terminal device, and FIG. 5 is a detailed diagram of the power supply circuit section 16 in FIG. 2. Figure, 4th
The figure is a block diagram of the terminal device of the present invention, and FIG. 5 is a switch circuit section which is the main part of the present invention. 11... Control circuit, 12... Starting circuit, 1
3... Station power supply circuit, 14... Start detection circuit, 2
7...OR circuit, 28...Switch circuit. 1st part

Claims (1)

[Claims] 1. In a terminal device power supply system in which one or more power supplies for operating the terminal device and one or more power supplies used as an interface are created and supplied by a power supply circuit from an AC commercial power supply, the power supply for the interface is A constant supply system is used, and the power supply for operating the terminal equipment is as follows:
A terminal device power supply system characterized in that a power supply switch is provided at the supplied load potential, and the power supply switch is activated to enable supply by activation of either the front or rear device.