JPH0612154A - Battery backup method - Google Patents

Abstract

(57) [Summary] [Purpose] In the event of a power failure, the system will be operated as long as possible without stopping the system to improve the operating rate of the system. [Configuration] When the power failure detection unit 2 detects a power failure, the power failure time monitoring timer TM of the backup control unit 1 starts,
The battery remaining amount detection unit 3 detects the remaining amount of the battery 4 and sets it in the backup control unit 1. The backup control unit 1 calculates the normal operation continuation time T, and T> TM
If so, the electronic circuit unit 8 is instructed to continue the normal operation by the battery, and if not, the evacuation process is instructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery backup system in an electronic device having a battery for backup operation, and more particularly to a battery backup system in which system stoppage is reduced.

[0002]

2. Description of the Related Art In computer systems, electronic devices, etc., power is supplied from a normal power source during system operation.
A so-called battery backup method is adopted in which, when the power supply of the system becomes abnormal such as power failure, power is supplied from a battery to prevent data from being destroyed.

In the conventional battery backup method, when the power failure detection circuit detects a power failure, a saving process for immediately saving the internal state to the external storage device is started, and the system is stopped after the saving process is completed. It also has the function of detecting the remaining battery level and displaying a warning on the display.

As a related prior art, for example, a power supply state display device for a small terminal (Japanese Patent Laid-Open No. 2-54322).
(See Japanese Patent Publication) and the like.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned conventional technique, when the power failure detection circuit detects a power failure, the evacuation processing is immediately performed, and if the system power is not restored after the processing is completed, the system is shut down. It has stopped. However,
Although the system power is restored instantaneously, or the battery capacity is sufficient and normal operation can be continued,
There was a problem that the operating rate of the system decreased because the operation was stopped immediately after a power failure.

It is an object of the present invention to provide a battery backup system which improves the operating rate of the system by operating the system without stopping the system as much as possible by the battery in case of power failure.

[0007]

In order to achieve the above object, in the present invention, in a battery backup system for backing up an electronic device by a battery when the main power supply is interrupted, a means for detecting the remaining amount of the battery at the time of power failure is provided. Calculating the time during which normal operation can be continued based on the preset amount of power required for normal operation, the amount of power required for evacuation processing during a power failure, the processing time required for evacuation processing, and the detected remaining battery level And a means for instructing to continue the normal operation by the battery when the calculated time exceeds the power failure time.

[0008]

When the power failure is detected, the power failure time monitoring timer TM of the backup controller is started. The battery level detector detects the battery level and sets it in the backup controller. The backup control unit calculates the normal operation continuation time T based on the remaining battery level, the preset amount of power during normal operation, the amount of power for evacuation processing during power failure, and the processing time for evacuation processing. If T> TM, the battery is instructed to continue the normal operation, otherwise the evacuation process is instructed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of the present invention. In FIG. 1, 1 is an electronic circuit unit 8 as described later.
On the other hand, a backup control unit 2 that outputs a normal operation continuation instruction or an evacuation process instruction, a power failure detection unit that detects a power failure of the power input unit 5, and a detection unit 3 that detects the remaining battery level of the battery 4, Reference numeral 6 is a power supply input switching unit that switches from the power supply input unit 5 to the battery 4 when the power failure detection unit 2 detects a power failure, 7 is a power supply unit, and 8 is an electronic circuit unit such as a computer system.

FIG. 2 is a diagram for explaining a method of calculating the normal operation continuable time in the backup control unit 1. That is, when the remaining battery power is A, the amount of electric power required for normal operation is B, the amount of electric power required for evacuation processing is C, and the evacuation processing time is D when the power failure occurs, the normal operation continuous time T is It is represented by T = (A−C × D) / B.

FIG. 3 shows a processing flowchart of the backup control unit at the time of power failure. Here, the amount of power required for the above-described normal operation is stored in the register B (not shown) of the backup control unit 1, the amount of power required for the save processing is stored in the register C, and the save processing time is stored in the register D. It is set as information when the system is installed or when the configuration is changed.

When the power failure detector 2 detects a power failure (step 101), the power failure time monitoring timer TM of the backup controller 1 is started (step 102). Next, the battery remaining amount detection unit 3 detects the remaining amount of the battery 4 and sets it in the register A of the backup control unit 1 (step 103).

Next, the backup control unit 1 calculates the continuous operation possible time by using the values set in the registers A, B, C and D, and sets it in the register T (not shown) in the control unit 1. (Step 104). Then, the timer value of the power failure time monitoring timer TM is compared with the register T, and if the remaining time is 0 or a negative value, the electronic circuit unit 8 is instructed to perform the save process (step 107). If the remaining time is positive,
The electronic circuit unit 8 is instructed to continue normal operation with the battery (step 106). In either case, when the power failure detection unit 2 detects a power recovery, the power input switching unit 6 switches to the normal power source and continues or resumes the normal operation.

[0014]

As described above, according to the present invention, the normal operation continuable time is calculated at the time of power failure, and when the normal operation is possible, the operation is continued by the battery. Outages are reduced and system reliability is ensured.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating a method of calculating a normal operation continuable time in a backup control unit.

FIG. 3 is a processing flowchart of a backup control unit at the time of power failure.

[Explanation of symbols]

 1 Backup control unit 2 Power failure detection unit 3 Battery remaining amount detection unit 4 Battery 5 Power input unit 6 Power input switching unit 7 Power supply unit 8 Electronic circuit unit

Claims (1)

[Claims] 1. A battery backup system for backing up an electronic device with a battery when a main power supply fails, a means for detecting the remaining battery level during a power failure, and a preset amount of power required during normal operation and a power failure during a power failure. Means for calculating a time during which normal operation can be continued based on the amount of power required for the evacuation process, the processing time required for the evacuation process, and the remaining battery level detected, and when the calculated time exceeds the power outage time , A battery backup system characterized by having means for instructing continuation of normal operation by a battery.