JPH07120230B2 - Uninterruptible power supply control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply control method, and more particularly to an uninterruptible power supply control method in a data processing system in which a momentary power failure determination time when a power failure occurs is lengthened.

In data processing systems, alternating current (AC) is used as part of the power supply. An uninterruptible power supply (UPS) that supplies a predetermined AC power for a certain period of time even if this AC input is interrupted is provided so that the work can be continued even in the event of a power failure.

[0003]

2. Description of the Related Art FIG. 5 is an explanatory view of the prior art, showing a backup operation by an uninterruptible power supply (UPS) in the case of a conventional AC input power failure. That is, UPS
7 shows a process at the time of a power failure of an AC input in a data processing system such as a computer system having a.

In FIG. 5, first, a resident power supply which is a power supply for operating a CPU (central processing unit), a main memory and the like is turned on. After that, an AC power supply, which is a power supply for operating an I / O (input / output) device including a plurality of I / O boards, is turned on, and the operation (AC operation) by this is started.

During AC operation, a power failure of the AC input occurs. Then, the UPS immediately starts the backup operation, and the I / O device continues the operation. On the other hand, when the momentary power failure determination time (the time from the occurrence of the power failure until the actual power failure notification to the software) elapses from the time of the power failure, the operating system (OS), etc. For software,
Power failure is notified. If the power failure is restored within this momentary power failure judgment time, this notification will not be issued. The software which received this notification turns off the power of the I / O device after performing the closing process.

[0006]

In order to realize an uninterruptible power supply, it is necessary to finish the above-mentioned processing until the power is turned off within a time when UPS can back up. That is, it is necessary to guarantee the closing process. For this reason, the rest after subtracting the closing processing time from the backupable time is the momentary power failure judgment time.

On the other hand, the time that can be backed up is UPS
Is determined by the relationship between the supply capacity of the I / O device and the power consumption of the I / O device. A plurality of I / O boards are mounted on the I / O device, but even when the maximum allowable number of I / O boards are mounted, the backupable time is It is fixed at the value at maximum mounting.

Therefore, the following problems occur. That is, the time during which backup is possible is determined by the value when the I / O board is maximally mounted (the upper limit is limited), so the instantaneous power failure determination time is also determined by the value when maximally mounted. However, depending on the system, the number of I / O boards mounted may be smaller than the maximum number. In this case, the UPS backup time should actually be longer. Therefore,
Conventionally, the instantaneous blackout determination time is fixed to the minimum time regardless of the number of I / O boards actually mounted. As a result, the momentary power failure determination time, that is, the time during which the work can be continued when the power failure is restored within this time, is shortened, and the possibility of power cutoff increases.

The present invention guarantees close processing, and
It is an object of the present invention to provide an uninterruptible power supply control method that increases the possibility of continuing work when a power failure is restored.

[0010]

FIG. 1 is a block diagram of the principle of the present invention, showing a data processing system according to the present invention. This data processing system has an I / O device unit 7 that is an AC power supply operating unit that operates with an AC power supply 10, and a processing device 1 that is a resident power supply operating unit that operates with a resident power supply 6 different from the AC power supply 10. . The I / O device section 7 is formed by mounting a plurality of I / O boards or I / O devices (hereinafter, simply I / O boards) 8. The data processing system also has an uninterruptible power supply (UPS) 9. UPS9
Backups the I / O device unit 7 when the AC power supply 10 fails. That is, AC power is supplied for a predetermined period.

The resident power supply operating unit is provided with a close processing unit 3 and an instantaneous blackout judging unit 5. The close processing unit 3
The I / O device unit 7 is closed and the AC power supply 10 is disconnected. The instantaneous power failure determination unit 5 determines the time during which the UPS 9 can back up the I / O device unit 7.

[0012]

[Operation] The instantaneous blackout determination unit 5 determines the supply capacity of the UPS 9 and the I / O
Based on the I / O board 8 actually mounted on the O device unit 7, the time during which the I / O device unit 7 can be backed up is calculated,
Furthermore, the instantaneous blackout determination time is calculated based on this. And
When the UPS 9 starts backing up the I / O device unit 7 during a power failure of the AC power supply 10, the momentary power failure determination unit 5 waits for the momentary power failure determination time to elapse from this power failure, and then the close processing unit 3 Will be notified of the power failure.

According to the above, the above-mentioned backup-enabled time depends on the power supply capacity of the UPS 9 and the actual mounted I / O.
It is determined based on the board 8, that is, the actual power consumption.
Therefore, for example, the smaller the number of actual mounted I / O boards 8 (the smaller the power consumption), the longer the backup possible time. As a result, the momentary power failure determination time obtained by subtracting the time for the closing process from the backup-enabled time also becomes longer as the number of actual mounted I / O boards 8 decreases. In other words, the I / O board 8 actually mounted
Optimized depending on. As a result, after guaranteeing the closing process, it is possible to make the momentary power failure determination time as long as possible, reduce the possibility of power-off, and reduce the possibility of business continuation when power is restored.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a processing unit 1 is operated by a resident power source 6 and comprises a CPU (central processing unit) and a memory.
On this memory, an OS (operating system) 2 which is software exists. ROM of CPU
The microprogram 4 exists on the (read-only memory). The close processing unit 3 and the instantaneous blackout determination unit 5 are respectively O
It is provided in S2 and the micro program 4, and can operate even when the AC power source 10 is out of power.

The close processing unit 3 is configured as a part of the OS 2. The close processing unit 3 recognizes the power failure notification from the instantaneous power failure determination unit 5, starts the close process, and disconnects the AC power supply 10 of the I / O device unit 7 after the close process. That is, the notification from the microprogram 4 is sent to the software O
S2 is made recognizable. The close process requires a predetermined time for its execution, but the momentary power failure determination time is set so that the close process is completed within a time period in which the backup by the UPS 9 is possible.

The instantaneous blackout judging section 5 is configured as a part of the microprogram 4. The instantaneous blackout determination unit 5 obtains the instantaneous blackout determination time at a predetermined time in advance, monitors whether or not the power outage exceeds the instantaneous blackout determination time when the AC power supply 10 fails, and gives a power outage notification when it exceeds.

The instantaneous blackout determination time is obtained as follows. As shown in FIG. 2, due to the power supply capacity of UPS9,
A curve A is determined in advance by the input voltage (horizontal axis) to the I / O device section 7 and the time (vertical axis) during which the UPS 9 can be backed up (guaranteed). Therefore, the input power Y
By knowing (VAm), the backup guarantee time X (minutes) can be obtained from this curve A. The input power Y is determined by the type and number of I / O boards 8 actually mounted on the I / O device section 7. That is, it is obtained as the sum of the maximum (rated) power consumption of the actual mounted I / O board 8.

The instantaneous power failure determination unit 5 is a processing unit 1 for the resident power supply 6.
When it is turned on, that is, when it becomes operable, the instantaneous power failure determination time is obtained as one of the initial operations. That is, the type and number of I / O boards (I / O hardware boards, input / output devices, etc.) 8 mounted (connected) to the I / O device section 7 at this point are recognized. Then, based on this recognition, for example, the maximum power consumption of each I / O board 8, which is given as information in advance in a table or the like, is obtained. Thus, the input power Y is calculated and the instantaneous blackout determination time is calculated. The instantaneous power failure determination time is obtained by subtracting the close processing time from the backup guarantee time X.

When the I / O board 7 is changed, added, or deleted in the I / O device section 7, each time,
Similarly, the instantaneous blackout determination time is obtained. By this,
I / O board 8 that is actually mounted on I / O device section 7
It is possible to optimize the instantaneous blackout judgment time according to the above.

The optimization of the momentary blackout determination time is shown in FIG. FIG. 3 is to be compared with FIG. In FIG. 3, when the resident power supply 6 is turned on, the instantaneous blackout determination time is obtained. After that, the AC power supply 10 is turned on and the AC power supply 1 is operated during the AC operation.
When a power outage of 0 occurs, UPS9 starts backup. The occurrence of this power failure is the starting point for the momentary power failure judgment time and the actual backup available time. On the other hand, the time of the closing process that requires a predetermined time is calculated backward from the actual backup available time, not the backup available time at the time of maximum mounting (FIG. 5). Therefore, the instantaneous blackout determination time in FIG. 3 is made longer than that in FIG. 5 by the time T (difference between the maximum mountable backup time and the actual backup time). Therefore, when the AC power supply 10 is restored, it is possible to increase the possibility of not performing the power failure notification and the power cutoff (which can be processed as a momentary blackout or a momentary blackout).

FIG. 4 is a UPS control processing flow. When the resident power supply 6 is turned on, the instantaneous blackout determination unit 5 executes the step 1
In step 2, the I / O board 8 actually mounted in the I / O device section 7 is confirmed, in step 2, the input power Y (system maximum power) is calculated, and in step 3, the backup guarantee time X is calculated. Then, the instantaneous blackout determination (maximum) determination time is calculated and stored in, for example, a predetermined storage area.

After that, it is assumed that the AC power source 10 is turned on and a power failure occurs in the AC power source 10 during the AC operation. In response to this, the UPS 9 starts the backup of the I / O device unit 7 and also notifies the microprogram 4 of this and activates the instantaneous power failure determination unit 5.

In step 4, the instantaneous blackout judging unit 5 sets the instantaneous blackout judging time in the timer. Then, the value of the timer is decremented at a predetermined time interval, it is checked whether or not the momentary power failure judgment time has elapsed, and the operation is repeated until the time has elapsed. When the instantaneous blackout determination time has elapsed, in step 5, the instantaneous blackout determination unit 5 notifies the close processing unit 3 of the power failure. If the AC power supply 10 is restored before this time elapses, this notification is not issued.

Upon receiving the notification, the close processing unit 3 performs a close process on the I / O device unit 7 in step 6, and disconnects the AC power supply 10 to the I / O device unit 7 in step 7.

[0025]

As described above, according to the present invention,
In uninterruptible power supply control, by setting the instantaneous blackout determination time according to the I / O board that is actually mounted in the I / O device part, the instantaneous blackout determination time is made as long as possible while guaranteeing the closing process. Therefore, it is possible to reduce the possibility of power-off and increase the possibility of business continuity at the time of power failure recovery, and to perform efficient backup in the event of power failure.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an explanatory diagram of backup time.

FIG. 3 is an explanatory diagram of optimization of a momentary blackout determination time.

FIG. 4 is a UPS control processing flow.

FIG. 5 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 Processing Device 2 OS 3 Close Processing Unit 4 Micro Program 5 Instantaneous Power Failure Detection Unit 6 Resident Power Supply 7 I / O Device Unit 8 I / O Board 9 UPS (Uninterruptible Power Supply) 10 AC Power Supply

Claims (3)

[Claims] 1. An I / O device section (7) comprising a plurality of I / O boards (8) mounted thereon and operated by an AC power supply (10).
In the data processing system, which comprises: and an uninterruptible power supply (9) that backs up the I / O device unit (7) when the AC power supply (10) fails, the I / O device unit (7) is closed. A close processing unit (3) that performs processing and disconnects the AC power supply (10), and an instantaneous power failure determination unit (a) that determines a time during which the I / O device unit (7) can be backed up by the uninterruptible power supply (9). 5), the instantaneous power failure determination unit (5) operates with a resident power supply (6) different from the AC power supply (10), and the I / O device unit (7)
The backup possible time is obtained based on the I / O board (8) actually mounted on the CPU, the instantaneous blackout determination time is calculated based on the backupable time, and the closing process is performed after the instantaneous blackout determination time has elapsed during the power failure. An uninterruptible power supply control method characterized by notifying the section (3) of the power failure. 2. The uninterruptible power supply control method according to claim 1, wherein the instantaneous power failure determination unit (5) is configured as a microprogram (4) that operates on the resident power supply (6). 3. The uninterruptible power supply control method according to claim 2, wherein the instantaneous blackout determination time is obtained when the resident power supply (6) is turned on.