JPH11265323A - Battery backup system and device - Google Patents

Abstract

(57) Abstract: The present invention is an apparatus that requires a high reliability such as a computer and backs up a storage element with a battery. A failure occurs in the battery and the battery backup circuit, and the data in the storage element is retained. Provided is a method and apparatus for guaranteeing data in a storage element even when the operation becomes impossible. When an abnormality occurs in a battery backup circuit, a power supply of a device is suppressed and a backup state of a storage element by a battery is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for driving a storage element used in a computer or the like with the power of a main power supply and the power of a battery. The present invention relates to an apparatus having a function of retaining stored data and a battery backup method.

[0002]

2. Description of the Related Art When a main power supply is cut off by a device such as a computer, a battery is mounted for the purpose of storing data written in a storage element, and the stored power is supplied by the power stored in the battery to perform writing. Retains the data. At this time, when the battery is not at the effective voltage / current or when the voltage required to hold the storage element cannot be output, this state is only detected and an abnormal state is displayed / reported.

[0003]

An abnormal state is detected even if the data in the storage element cannot be retained after the main power supply is cut off due to an abnormality or failure of the battery or the like as in the previous embodiment. Since only display / report is performed, there is a possibility that the main power supply may be cut off manually or automatically (external control). In this case, the reliability of the device is reduced, for example, the data written in the storage element is lost without supplying sufficient power to the storage element.

[0004]

SUMMARY OF THE INVENTION A storage element DC connected to a main power supply when data cannot be held by a battery.
Main power and DC power are controlled so that the power cannot be turned off manually or automatically (external control).

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a case where a DC power supply having no power on / off control signal input is used, and FIG. 2 shows a case where a DC power supply having a power on / off control signal input is used. FIG. 3 shows a DC having a power on / off control signal input.
The case where the power supply is controlled and the storage element control circuit is simultaneously controlled will be described.

In the embodiment shown in FIG. 1, a main power supply AC power indicated by 1 is connected to a DC power supply indicated by 6 via a 3 power supply control circuit block. Also, a battery backup power supply circuit 9 using a battery 8 as a power source is connected. The outputs of the power supplies 6 and 9 are wired-ORed at the inputs of the 11 storage elements and used as the drive power supply and the data holding power supply for the 12 storage elements. 9 battery abnormality detection circuit 1 in the battery backup power supply circuit
The abnormality and failure of the battery detected at 0 are transmitted to the power supply control circuit 5 provided in the power supply control circuit block 3 as a battery abnormality signal 7. When the power supply control circuit block 5 receives this battery abnormality signal, it suppresses the external power-on signal 2 even if it is off, and the power-off circuit 4 does not output the main power-off signal. The power supply remains ON and the AC power is continuously supplied to the DC power supply 6, and the DC power supply 6 operates. For this reason, the battery backup power supply circuit 9 does not enter the battery backup state, and active power is supplied to the storage element to guarantee the data held therein.

In the embodiment shown in FIG. 2, a main power supply AC power 1 is connected to a DC power supply 6. Also, a battery backup power supply circuit 9 using a battery 8 as a power source is connected. The outputs of the power supplies 6 and 9 are wired-ORed by the inputs of 11 storage elements and 12
Is used as a drive power supply for the storage element and a power supply for holding data. The battery abnormality and failure detected by the battery abnormality detection circuit 10 in the battery backup power supply circuit 9 are transmitted to the power supply control circuit 5 provided in the power supply control circuit block 3 as a battery abnormality signal 7. When the power supply control circuit block 3 receives the battery abnormality signal, it suppresses the external power-on signal 2 even if the external power-on signal is off, and turns on the DC power supply without turning off the DC power-off control signal 13. Leave it alone. As a result, the DC power supply 6 does not stop its operation and does not enter the battery backup state by the battery backup power supply circuit 9 so that active power is supplied to the storage element and the data held therein is guaranteed.

In the case of the embodiment shown in FIG.
The control of the battery backup power supply circuit is the same as that of FIG. 2, but when the external power-on signal 2 is turned off, the storage element control circuit 14 is reset and stopped, and the storage element control signal 15 is also stopped. Thus, data is further guaranteed than in the first and second embodiments.

[0009]

According to the present invention, when a failure occurs in the battery and the battery backup circuit and the data in the storage element cannot be retained after the power of the device is turned off, the data in the storage element is lost due to a human error. Data can be guaranteed even in the event of the above failure, and the reliability of the system increases.

[Brief description of the drawings]

FIG. 1 shows a battery backup circuit system when a DC power supply having no power on / off control circuit is used.

FIG. 2 shows a battery backup circuit system when a DC power supply having a power on / off control circuit is used.

FIG. 3 shows a system in which a control circuit for a storage element is simultaneously controlled by a battery backup circuit when a DC power supply having a power on / off control circuit is used.

[Description of Signs] 1 ... AC input, 2 ... External power-on signal, 3 ... Power control circuit block,
4 power supply disconnection circuit, 5 power supply control circuit,
6 DC power supply 7 Battery abnormality signal
8 ... battery, 9 ... power supply circuit for battery backup, 10 ... battery abnormality detection circuit, 11 ...
Power supply line for storage element, 12 ... storage element,
13 DC power-on control signal, 14 storage element control circuit, 15 storage element control signal.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazunori Sanpin 2880 Kozu, Kozu, Odawara City, Kanagawa Prefecture Inside Hitachi Computer Equipment Co., Ltd.

Claims (2)

[Claims] 1. An apparatus for driving a storage element used in a computer or the like with the power of a main power supply and a battery,
If data cannot be retained by the battery, the main power supply and the DC power supply are controlled so that the DC power supply for the storage element connected to the main power supply cannot be turned off manually or automatically (external control). A battery backup method wherein data of a storage element is retained. 2. An apparatus for driving a storage element used in a computer or the like with the power of a main power supply and a battery,
2. The apparatus using the battery backup method according to claim 1, wherein the apparatus has a function of retaining data stored in the storage element with the power of the battery when the main power supply is cut off.