JPH02241243A - Automatic power control system - Google Patents

Abstract

PURPOSE:To control the power of terminal equipment from a power controller, and to eliminate continuous power supply and the residence of a program for automatic power control by supplying a power control signal to a ring transmis sion line from a signal generator when all terminal equipments are not con nected to the transmission line. CONSTITUTION:When the power of all the terminals 15 is OFF, the ring 1 forms two closed wirings. The signal generator 3 to remote-command power ON control is connected to the ring 1 by a branching device 6 for RPC through a switch(SW) 4. By turning ON the switch 4 temporarily, potential difference is impressed between A and B of the ring 1 through the branching device 6 for RPC. Thus, DC potential is impressed to all the power controllers 7 con nected to the ring 1. A signal detection circuit 9 supplies the power to a relay 10 by turning ON the relay 18 inside it, and the power is supplied to the main power 14 of the terminal 15 because of the turning ON of the relay 10, and the terminal 15 is turned into a power ON state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic power control system using a ring transmission path of a token ring LAN (Local Area Network).

[Conventional technology]

The conventional automatic power-on method for terminal devices was
As described in Japanese Patent Publication No. 7858 and Japanese Patent Application Laid-Open No. 57-19044, a power-on command is issued by a central processing unit (center), and in the terminal device, a part that decodes this power-on command is already a communication control adapter. A power source separate from the main power source is supplied to the side to receive and judge power-on commands from the center, and to control the main power source of the terminal device.

[Problem to be solved by the invention]

In the above conventional technology, when an automatic power-on method for a token ring LAN system is realized, the token ring LAN adapter of the terminal that performs automatic power control is always powered on separately from the terminal's main power supply, and the token ring LAN adapter that performs automatic power control is always powered on separately from the terminal's main power supply. Sending and receiving operations had to be performed. There was also the problem that a program for deciphering and determining power-on commands had to be resident.

An object of the present invention is to eliminate the constant supply of power and the need for resident programs for automatic power control by utilizing the ring transmission path of a token ring LAN.

[Means for Solving the Problems] The present invention connects a signal generating device and a power supply control device that detects this signal to a ring transmission path, and when all terminal devices are not connected to the ring transmission path, the signal generating device It is characterized by an automatic power control method that controls the power of the terminal device from the power control device by applying a power control signal from the ring transmission line to the ring transmission line.

[Effect]

Two wires are formed in a token ring LAN (IEEE802.5) ring when all connected terminals are unused or during a self-test period before use. Therefore, when the ring is not in use, a signal for remote power control is transmitted through this ring to control the power supply of the terminal device.

After that, the connection between the power supply control device and the ring is disconnected, so that the influence of the power supply control device on the ring disappears.

Furthermore, if the power of a terminal is cut off while another terminal is transmitting/receiving data, the power control device will connect to the ring, but the ring connection part of the power control device has a token ring LAN transmission that passes within the link. A low-pass filter is inserted that does not sufficiently affect the signal, so it does not affect the ring, and the power supply control device misjudges the transmission signal as a power-on signal, preventing malfunctions such as turning on the power of the terminal.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram of a 1-1 Kunling LAN system employing the present invention, and shows a state in which all terminals are powered on.

When the terminal 15 is powered off, the branch device 5 is in a state where the ring 1 is directly connected. Therefore, all terminals 15
When the power is off, ring 1 forms two closed wire rings.

FIG. 2 is a configuration diagram showing a state in which the terminal 15 is powered on and performing transmission/reception operations in the system of FIG. 1. Inside the branching device 5, the ring 1 is separated and divided into input and output circuits of the terminal 15. Therefore, terminal 1
While the ring 5 is transmitting and receiving, the ring 1 is disconnected within the branching device 5 for each connected terminal 15.

Therefore, the present invention controls the power of the terminal by utilizing the fact that the ring 1 forms a closed wiring when the power of the terminal 15 shown in FIG. 1 is in the off state.

Figure 3 is a concrete circuit diagram of Figure 1.
The operation of the present invention will be explained with reference to FIGS. 3 and 4.

The terminal 15 shown in FIG. 3 controls the power supply by a power control device (RPC) 7, and the terminal 15 is connected to a branch device 5. The power supply control devices 7 are connected to the rings 1 through RPC branch devices 6, respectively. A plurality of terminals are connected to ring 1 with a similar configuration.

Prior to automatically turning on the power of the terminal 15, the signal generator 3 that remotely commands power-on control is a switch (SW) 4.
It is connected to ring 1 via RPC branching equipment 6.

The signal generator 3 can be a simple DC power supply as shown in FIG.
A potential difference is applied between AB of ring 1 through branching device 6 as shown in FIG. As a result, a DC potential is applied to all power supply control devices 7 connected to the ring 1. The signal detection circuit 9 supplies power to the relay 10 by turning on the internal relay 18, and by turning on the relay 10, power is supplied to the main power supply 14 of the terminal 15, and the terminal 15
is in the power-on state.

Further, when the internal relay 18 of the signal detection circuit 9 is turned on, the relay 8 is turned on with a delay of time T1 through the delay circuit 1 as shown in FIG. As a result, the power supply control device 7
It is separated from the ring 1 and has no influence on the ring 1.

On the other hand, when the main power supply 14 is turned on, the LAN adapter 16 mounted in the terminal 15 performs initial processing, and after the initialization is completed, it is connected to the ring 1 via the branching device 5, and the configuration shown in FIG. and begins data transmission/reception operations. As shown in FIG.
power control device 7 to turn off before connecting to ring 1.
There is no effect on Ring 1.

Next, the terminal 15 is turned off from the main terminal 2 to the fourth terminal, which manages and gives commands to the power supply of the terminal system shown in
As shown in the figure, all terminals 15 are disconnected (D
ISC) Send a command.

Upon receiving the DISC command, each terminal 15 performs termination processing and disconnects from the ring 1. Next, terminal 15 waits for time T2 when all terminals 15 connected to ring 1 are disconnected, outputs off signal 13 from power off circuit 17, and opens relay 12. This opens the relay 10 and turns off the main power supply 14.

At the same time, the relay 8 is also closed, and the power supply control device 7 is connected to the ring 1 again, allowing the system to return to its initial state.

As described above, the present invention makes it possible to automatically control the power supply of the terminal 15.

Furthermore, if the relay 8 is turned on due to a failure or malfunction while the terminal 15 is transmitting or receiving data, the power supply control device 7 will be connected to the ring 1, but a low-pass filter 19 is installed on the power supply control device 7 side. It is inserted to prevent any influence on ring 1. Also, care is taken to prevent the power supply control device 7 from erroneously detecting data flowing on the ring 1.

〔Effect of the invention〕

According to the present invention, automatic power control
Because it can be realized without affecting the protocol of
There is no need to keep a special power supply on the terminal side,
It is very effective economically.

Further, since the control signal line can use a ring transmission line for a token ring LAN originally prepared for data transfer, there is no need to wire the control signal, and construction in an existing system is easy.

[Brief explanation of drawings]

Fig. 1 is a block diagram of hardware according to an embodiment of the present invention, Fig. 2 is a block diagram showing the state in which the LAN adapter is inserted into the ring from Fig. 1, and Fig. 3 is a block diagram of the circuit example of Fig. 1. The figure shown in FIG. 4 is an operation time chart of the automatic power supply control shown in FIG. DESCRIPTION OF SYMBOLS 1...Ring, 2...Main terminal device, 3...Signal generation device, 4...SW, 7.Power control device, 8...α for relay, 9...Signal detection circuit, 10.・Relay K
b, 11...delay circuit, 13...off signal, 14.
... Main power supply, 15 ... Terminal device, 17 ... Power off circuit.

Claims (1)

[Claims] 1. A signal generator for controlling the power supply of terminals and a power supply control device for receiving and detecting the signal are connected to the ring transmission path, and when all the terminals are not connected to the ring, the line between the signal generator and the ring is connected. An automatic power control method characterized in that the power supply control device controls the power supply of the terminal by applying a power control signal to the terminal.