JPS62232014A - Power source controller for information processing system - Google Patents

Abstract

PURPOSE:To shorten the time required for emergency power-off by detecting the power-off of each part to be controlled by an individual signal line connected to the part while outputting an emergency power-off command repeatedly to a serial bus. CONSTITUTION:A power-off detecting part 14 detects the power-off of parts 3, 4-(n) to be controlled through individual detection signal lines 23, 24-2n connected to parts 3, 4-(n). A control part 11 generates an EPO command destined for all parts to be controlled and sends this command to a serial bus 2 through a serial bus interface part 12. At the time of correct reception and decoding of the first EPO command, the part to be controlled turns off its own power source immediately without sending the response to the serial bus 2. When the power source is turned off, a power-off signal is outputted to corresponding one of detection signal lines 23-2n.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply control device used in an information processing system, and more particularly to a power supply control device that shortens the emergency disconnection time of a power supply system.

2. Description of the Related Art In general, in an information processing system consisting of a large number of devices that are selectively supplied with power and activated, there is a power supply control unit that is distributed within each device, and a centralized power supply control device that centrally controls these devices. A power control system has been constructed consisting of:

In such a power control system, a centralized power control device issues power control commands such as power on/off to the power control unit in each device, and responses to these commands are sent from the power control unit in each device. Returned to the central power control unit.

The frequency of transfer of such power control commands and responses thereto is much smaller than the frequency of transfer of data to be processed via a parallel bus connecting each device. For this reason, for the power supply system, a serial bus configuration is often adopted in which the power supply control units in each device are connected to the centralized power supply control device in a serial bus manner. Hereinafter, the centralized power supply control device will be simply referred to as a "power supply control device", and the power supply control section within each device will be referred to as a "controlled section".

When the power control device needs to issue a power control command to a specific controlled part, it creates a corresponding power control command, attaches the address of the specific controlled part uniquely within the system, and serializes it. Output on the bus. A specific controlled unit that receives this power control command via the serial bus outputs a response to this power control command onto the serial bus, and also executes this power control command.

A special power control command is an emergency power-off command that is issued when all devices in the system are suddenly turned off. The power supply control device sends this emergency power cutoff command onto the serial bus in the form of a broadcast communication command addressed to all controlled units. Regarding this power supply emergency disconnection command, responses from each controlled unit are omitted in order to shorten the emergency disconnection completion time.

Since the transmission/reception function between the power supply control device and the controlled unit is relatively simple, it is expected that there will be a controlled unit that fails to receive and decode the emergency power cut-off command even if it is sent only once. Nevertheless, the response from the controlled unit is omitted for the electric 'rA emergency disconnection command. Therefore, in order to ensure that the emergency power-off command is sent and received thoroughly, this command is output on the serial bus a predetermined number of times in succession. When the power supply control device finishes sending out the emergency power cutoff command a predetermined number of times, it also cuts off the power in its own device to complete the emergency power cutoff control.

Problems to be Solved by the Invention In the above-mentioned conventional power supply control device, in order to ensure that the response to the emergency power supply disconnection command is completely transmitted and received, the command is sent and received a predetermined number of times (for example, 32 times).
The power within the own device cannot be turned off until the transmission is complete.

Therefore, there is a problem in that it takes a long time to complete the emergency disconnection.

Structure of the Invention Means for Solving the Problems The power supply control device of the present invention, which solves the problems of the prior art described above, repeatedly outputs an emergency power cutoff command on a serial bus while individually By detecting the power cut in each through the signal line and detecting the power cut in all controlled parts, or by immediately cutting off the power in the own device as soon as the number of repeated outputs of the above command reaches a predetermined value, The system is configured to reduce the time required for emergency power disconnection.

Hereinafter, the operation of the present invention will be explained in detail together with examples.

Embodiment FIG. 1 is a block diagram showing the configuration of a power supply control system constructed in an information processing system including a power supply control device according to an embodiment of the present invention.

In the figure, 1 is a power supply control device according to an embodiment of the present invention, 2 is a serial bus, and 3.4...n are controlled parts connected to the power supply control device 1 via the serial bus 2. be. The controlled units 3 to n are installed in a distributed manner within various processing devices constituting this information processing system.

The power supply control device 1 that centrally controls the controlled units 3 to n includes a power failure detection unit 14 in addition to a control unit 11, a serial bus interface unit 12, and a power supply unit 13. The power-off detection unit 14 detects power-off of the corresponding controlled unit via individual detection signal lines 23.24...2n connected to each of the controlled units 3.4...n.

When the power supply emergency disconnection process becomes necessary, the control unit 11 controls the second
This process starts according to the procedure illustrated in the flowchart in the figure.

In the first step 31, the control unit 11 sends the first power emergency disconnection command (rE
(referred to as "Po command"). That is, the controller 11 creates an EPO command addressed to all controlled units, and sends it onto the serial bus 2 via the serial bus interface unit 12.

The controlled unit that has correctly received and decoded this first EPO command immediately turns off its own power without sending a response to this on the serial bus 2. With this power cutoff, a power cutoff signal is output onto the corresponding detection signal lines 23 to 2n.

When a power-off signal appears on all the detection signal lines 23 to 2n, the power-off detection unit in the power supply control device 1 outputs a high signal to the output terminal 0 to notify that.

When the control unit 11 in the power supply control device 1 finishes issuing the first EPO command, it proceeds to the next step 32 and reads the output of the power-off detection unit 14 to ensure that all controlled units are powered off. Determine whether it has finished.

When the control unit 11 detects that there is a controlled unit whose power has not been completely disconnected because the output of the power-off detection unit 14 is in a low state, the control unit 11 increments the count value of the number of commands issued in step 33. After that, proceed to step 34.

The control unit 11 checks whether the incremented count value has reached a predetermined value, for example 32. In this case, since the count value is 2, the control unit 11 returns to step 31 and issues the second EPO command.

Excluding the controlled unit that has already stopped operating due to the first EPO command (among the remaining controlled units, the controlled unit that correctly received and decoded the second EPO command will send a response to this EPO command over the serial bus 2). Immediately turn off the power to the own device without transmitting to the
A new power-off signal is output onto the corresponding detection signal lines 23 to 2n.

Similarly, the control unit 11 issues and controls the EPO command. Repeat the power-off test for B equipment.

When the control unit 11 detects in step 32 that the power has been cut off in all the controlled units 3 to n from the high output of the power-off detection unit 14, the control unit 11 immediately proceeds to step 35 without issuing any subsequent EPO commands. move on. The control unit 11 is
In step 35, the power supply unit 13 within the device itself is disconnected to complete the emergency power disconnection process.

When the control unit 11 detects in step 34 that the number of times the EPO command is issued has reached a predetermined value before detecting that the power is cut off in all controlled units 3 to n,
Proceeding to step 35, the power supply section 13 in the own device is disconnected, and the emergency power supply disconnection process is completed. The controlled unit whose power is not cut off is treated as an exceptional unit whose power cannot be cut off due to a failure or the like.

Effects of the Invention As explained in detail above, the power supply control device of the present invention has the following effects:
When a power outage in all controlled parts is detected through individual signal lines connected to each controlled part, the power within the own device is immediately cut off without repeating subsequent EPO commands up to a predetermined number of times, and emergency power cutoff processing is performed. Since the configuration is such that the emergency disconnection can be completed in a normal operating state, the time required to complete the emergency disconnection can be significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a power control system constructed in an information processing system including a power control device according to an embodiment of the present invention, and FIG. 5 is a flowchart showing the procedure of emergency power cutoff processing by the unit 11. FIG. 1...Power control device, 2...Serial bus, 3~n...
Controlled unit, 11: Control unit, 12: Serial bus interface unit, 13: Power supply unit, 14: Power failure detection unit, 23 to 2n: Power failure detection signal line.

Claims (1)

[Claims] The power supply control device includes a power supply control device and a plurality of controlled units connected to the power supply control unit via a serial bus, and the power supply control unit sends an emergency power cutoff command to all controlled units. In the power supply control system of an information processing system, which has the function of outputting on the serial bus, and each controlled unit has the function of executing the response to this emergency power supply disconnection command without sending it on the serial bus, The power supply control device repeatedly outputs a power supply emergency disconnection command on the serial bus and detects power supply disconnection in each controlled unit via individual signal lines connected to each controlled unit,
A power supply control device for an information processing system, characterized in that the power supply control device for an information processing system is characterized in that it immediately cuts off the power supply within the device itself as soon as it detects the cutoff of power in all controlled units or the number of times the emergency power supply cutoff command is repeatedly outputted reaches a predetermined value. .