JPH04178855A - Personal computer - Google Patents

Abstract

PURPOSE:To preserve data in processing even when malfunction or the failure of an external power source is generated and to continue operation at the time of restarting a device by saving data by a battery in the device when the supply of the external power source is disconnected during the period of data processing. CONSTITUTION:This personal computer is provided with a power source ON/ OFF detecting circuit 3 for detecting the ON/OFF of a DC power source by supplying power from the backup DC battery 4 at the time of turning off the power source of the device. A backup memory 8 to be driven by receiving power supply from a normally power supply circuit 6 to which power is always supplied from the battery even if the DC power source 2 is turned off by the signal of the circuit 3 and a program for saving necessary data to the memory 8 by operating a CPU 11 and a main memory 12 by power supply from a temporary power supply circuit 7 when the power source 2 is turned off are also included in the personal computer. Thereby, data can be saved at the time of power OFF. Consequently, data in processing can be prevented from being erased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a personal computer, and more particularly to a device provided with means for protecting data from being erased even if the power to the device is turned off during data processing.

[Conventional technology]

Conventionally, in this type of personal computer, if you try to turn off the power switch during data processing, the power supply section is controlled to maintain the power supply voltage until the series of processing is completed, and then the power is automatically turned off. It has become.

[Problem to be solved by the invention]

As described above, conventional personal computers use a normal power source to ensure data safety when the power is turned off. Therefore, if the power supplied from the outside is cut off,
The drawback is that this save cannot be performed and the data being processed will be lost.

[Means to solve the problem]

The personal computer of the present invention has a backup DC9 that backs up the DC power when the device is powered off.
Power is supplied from the pond and DC battery, and the DC power is turned on/off.
A power on/off detection circuit that detects power off and a power on/off detection circuit that detects power on/off.
In response to the signal from the off detection circuit, power is supplied by the constant power supply circuit, which is constantly supplied with power from the DC battery even when the DC power supply of the device is turned off, and the constant power supply circuit.
A backup memory that operates, a temporary power supply circuit that receives power from a DC battery to back up temporary data after the DC power is turned off, and supplies this power to the CPU and main memory, and a DC power supply. When off,
The government owns a program that operates the CPU and main memory using power from the temporary power supply circuit and saves necessary data to the backup memory.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

Fig. 1 is a block diagram of a personal computer according to an embodiment of the present invention, Section 2 is a time chart when the power supply shown in Fig. 1 is turned off, and Fig. 3 is a time chart when the power supply shown in Fig. 1 is turned on. It is a chart diagram.

In Figure 1, external AC power supply 1, DC power supply 2, CPU
II, main memory 12, disk memory 13, disk controller 14, display 15, display controller 16, keyboard 17, keyboard controller 18, and system bus 19 are similar to those of a conventional general computer, and when the power is turned on, It works like this:

First, A and C power are supplied from an external AC power supply 1 to a DC power supply 2, and power is supplied from the DC power supply 2 to each part. Then, the CPU II performs internal processing according to the program written in the main memory 12. Here, when the operator performs an operation from the keyboard 17 controlled by the keyboard controller 18, the CPU II performs a series of processes according to the operator's instructions, and the results are displayed on the display 15 through the display controller 16. The processed data is then processed by the disk controller 14.
is controlled by and stored in the disk memory 13.

Next, the operation when the power is turned off will be explained with reference to FIGS. 1 and 2.

At 100 in FIG. 2, when the external AC power supply 1 is turned off,
The DC power supply 2 is also turned off, and the disk memory 13 and disk controller 14 are supplied with power from the DC power supply 2.
, display 15, display controller 16,
The keyboard 17 and keyboard controller 18 lose power and become inoperable.

However, as shown at 102 and 103, the power on/off detection circuit 3 and the power control section 5 can operate because they are supplied with power from the DC power source 4.

Then, power is supplied from the DC power supply 4 to the backup memory 8 through the constant power supply circuit n6 of the power supply control unit 5, and to the CPU], 1, and the main memory 12 through the temporary power supply circuit 7.

Here, the power on/off detection circuit 3 detects the on/off change in the power supply voltage and sends a power off signal to the power supply control section 5 and the system bus 19. Then, as shown at 102, the termination processing period signal of the power supply control unit 5 is turned on.

At the same time, as shown at 104, the power off detection signal entered into the CPtJll via the system bus 19 causes the C
PUII is the program storage section 9 of the backup memory 8
Runs the termination processing program written in advance. Then, by this termination processing program, the data that was being processed before the power was turned off and other information that should be saved are stored in the data storage section 10.

When the operation of the termination processing program is completed, the termination processing period signal 101 is turned off, and as shown at 102, the power supply of the temporary power supply circuit 7 is turned off, and the CPU11. The supply of power to the main memory 12 is stopped. In this case, 1
As shown in 03, the power supplied by the power supply circuit 6 remains as it is, so power continues to be supplied to the backup memory 8.

Next, the operation when the power is turned on will be explained with reference to FIGS. 1 and 3.

In FIG. 3, when the external AC power source 1 is turned on, until the DC power source 2 is turned on, as shown at 108 in FIG.
Following 03, only the power supply of the constant power supply circuit 6 is turned on.

Here, when the DC power is turned on as shown at 105,
As shown at 107, DC power is supplied to the temporary power supply circuit 87, and power is supplied to CPtJll and the main memory 12. Then, as shown at 109, the start processing program is activated by the CPU operation, and the data stored in the data storage section 10 of the backup memory 8 is written to the disk memory 13 through the disk controller 14 in the process when the power is turned off, and the data is restored. Perform processing. After that, normal data processing is performed.

Further, as shown at 108, at the same time as the DC power is turned on, the power supplied to the constant power supply circuit 6 is switched from the DC battery 4 to the DC power supply.
Switches to C power supply 2.

During this time, the end processing period signal does not change as shown at 106.

〔Effect of the invention〕

As explained above, according to the present invention, even if the external power supply is cut off during data processing, the data can be saved by the battery inside the device, so even if a malfunction or external power failure occurs, the data being processed can be saved. This has the effect of allowing the device to continue operating as it is when the device is restarted.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a personal computer according to an embodiment of the present invention, Fig. 2 is a time chart when the power supply shown in Fig. 1 is turned off, and Fig. 3 is a time chart when the power supply shown in Fig. 1 is turned on. It is a chart diagram. DESCRIPTION OF SYMBOLS 1... External AC power supply, 2... DC power supply, 3... Power on/off detection circuit, 4... DC battery, 5... Power supply control unit, 6... Continuous power supply circuit, 7... Temporary power supply circuit, 8... Backup memory, 9... Program storage section, UO... Data storage section, 11...
CPU, 12... Main memory, 13... Tisp memory, 14... Disk controller, 15...
Display, 16...Display controller,
17...keyboard, 18...keyboard controller, 19...system bus.

Claims (1)

[Scope of Claims] A backup DC battery that backs up a DC power source when the device is powered off; a power on/off detection circuit that is supplied with power from the DC battery and detects whether the DC power source is on or off; In response to the signal from the power on/off detection circuit, a constant power supply circuit that is constantly supplied with power from the DC battery even when the DC power supply of the device is turned off, and a constant power supply circuit that supplies power and operates. a backup memory that is powered by the DC battery for temporary data backup after the DC power source is turned off;
U. a temporary power supply circuit that supplies this power to the main memory; and when the DC power supply is turned off, the CPU and the main memory are operated by the power from the temporary power supply circuit;
A personal computer comprising: a program for saving necessary data to the backup memory.