JPH0670769B2 - Power control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power supply control method, and particularly to an information processing apparatus that backs up with a backup power supply such as a capacitor during momentary power failure, and lengthens the backup time during momentary power failure. The present invention relates to a power supply control method suitable for operating.

[Prior art]

When a conventional device detects a decrease in the power supply voltage as described in JP-A-59-14920, it saves the contents of the storage device in another nonvolatile storage device and interrupts the task. There is a method of restoring the contents of the storage device saved in the nonvolatile storage device to the storage device when the power supply voltage is restored, and then restarting the task. After detecting the power supply voltage drop, the conventional device must guarantee normal operation for a relatively long time to transfer the contents of the memory device to another non-volatile memory device. Must continue to supply electricity. Therefore, a large capacity backup power supply is required.

[Problems to be solved by the invention]

The above conventional technique requires a relatively large-capacity backup power supply even for a temporary power failure such as a momentary power failure due to a momentary power failure or the like.

In an information processing system, it is common to prepare an uninterruptible power supply facility when it is necessary to continue processing or save data for a long power failure. However, with respect to the momentary power failure that often occurs in many cases, there are many devices that do not prepare a special power supply facility such as an uninterruptible power supply facility and perform a backup at the time of power failure with a capacitor in the power supply unit of the information processing device. In recent years, the demand for stable operation of information processing equipment has increased more and more, and in order to operate stably for a momentary power failure for a relatively long time, there is a tendency for the backup capacitor to have a large capacity, which is an obstacle to downsizing of equipment. It is one.

An object of the present invention is to make it possible to recover the process from a momentary power failure for a long time with a power supply backup capacitor having a relatively small capacity.

[Means for solving problems]

The above purpose has a power failure detection circuit that detects a voltage drop due to an instantaneous power failure, etc., and in the device, when the process is temporarily stopped and then the process is restarted, the part that retains the data necessary for restart is The configuration that includes power supply and the configuration that does not include the part that holds the data required for restart are separated and power can be supplied separately. By stopping the power supply to the components that do not include the part that holds the power and reducing the amount of power compared to normal operation, the discharge current of the backup power supply such as the capacitor of the power supply is reduced and the backup time is extended. Turn into.

It is well known that the backup time can be extended by reducing the discharge current of the backup power supply such as a capacitor.

At the time of power recovery, when power failure is detected by the power failure detection unit, power supply is restarted to the components that do not include the part that retains the data necessary for the restart, and power is supplied by the backup power supply at the time of power failure. It is configured by using the restart data from the configuration including the portion holding the data which was holding the data and required for the restart, and restarting the process.

[Action]

When the power failure detection unit detects a voltage drop due to an instantaneous power failure, etc., 1
And outputs a power failure detection signal that becomes 0 when power recovery is detected. This signal is sent to the task control unit and the power feeding control unit. The task control unit stops the task when the power failure detection signal becomes 1,
When it becomes 0, the task is restarted. The power supply controller operates to stop the power supply when the power failure detection signal becomes 1, and restart the power supply when the power failure detection signal becomes 0. As a result, the power supplied to the device is reduced during a power failure, and the backup time of the backup power supply during a power failure can be extended.

Depending on the device, if the power outage is longer than the backup time and it becomes impossible to restart, even if the power is restored after that, the power failure detection signal remains 1 and the restart of the task is suppressed and malfunction occurs. You may need the function to prevent.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows the structure and connection of the present invention.

The AC input AC is rectified by the rectification unit 1 to produce an unstabilized DC output P. The unstabilized DC output P is input to the stabilizing unit 2 to generate the stabilized DC output DC. In addition, the unstabilized DC output P drops in voltage,
It is connected to a power failure detection unit 3 that detects a power recovery and a capacitor 4 that holds the voltage for a certain period of time when the voltage drops due to a power failure or the like. When the processing of the processing unit 5 that executes the processing is temporarily stopped and then the processing is restarted, a portion that holds data necessary for restarting, for example, a program counter unit 6a that stores the execution order of the programs, The data storage main part 6 including a memory unit 6b storing data being executed, a general-purpose register unit 6c storing intermediate results being executed, etc. A reconfigurable part, for example, an operation unit 7a that executes an operation,
And a part 7 that is configured by a calculation control part 7b for controlling the operation of the calculation part 7a and does not hold data necessary for restarting.
The structure is such that power can be supplied separately. The output S of the power failure detection circuit 3 controls the ON / OFF of the stabilized DC output DC, and the power supply control unit 8 and the process control unit 9 that controls the interruption and the start of the process
Connect to. The stabilized DC output DC is connected to the data holding main portion and the data holding unnecessary portion via the power feeding control unit 8.

When the voltage drop of the unregulated DC output P due to an instantaneous power failure or the like is detected by the power failure detection unit 3 and the power failure detection signal S becomes "1", and the power failure detection signal S becomes "1", the processing control unit 9 processes The processing being executed in the part 5 is stopped, and the power supply control part 8 stabilizes the DC output.
The DC is turned off to stop the power supply to the data holding unnecessary portion 7.

The power failure detection signal S becomes "0" at power recovery.
Is 0, the power supply controller 8 turns on the stabilized DC output DC.
Then, the power supply to the data holding unnecessary unit 7 is restarted, the processing control unit 9 activates the processing unit 5, and power is supplied by the stabilized DC output DC held by the backup of the capacitor 4 even during the processing interruption, and the data is stored. The execution of the process is restarted by using the held data of the data holding part.

Therefore, according to the present embodiment, when the stabilized DC output DC is created by backing up the capacitor 4 due to a power failure or the like, it acts so as to stop the power supply to the data holding unnecessary portion, so that the discharge current from the capacitor 4 is usually The amount of current can be made smaller than that during operation, and the backup time for stabilizing the DC output DC stabilized by the capacitor 4 can be extended by the capacitor having a relatively small capacity.

〔The invention's effect〕

According to the present invention, when the input voltage drops due to a power failure or the like and the stabilized DC output is maintained by the backup power supply of the capacitor, the power supplied from the backup power supply can be reduced, so that the capacity of the capacitor is relatively small. The backup power supply can extend the backup time.

It is generally known that the electric power supplied from the backup power source and the backup time have a substantially proportional relationship.

[Brief description of drawings]

 FIG. 1 is a configuration and connection diagram of an embodiment of the present invention. 1 ... Rectification unit, 2 ... Stabilization unit, 3 ... Blackout detection unit, 4 ... Capacitor, 5 ... Processing unit, 6 ... Data holding main unit, 6a ... Program counter unit, 6b ... General-purpose register unit, 7 ... No data holding required Unit, 7a ... Arithmetic unit, 7b ... Arithmetic control unit, 8 ... Power feeding control unit, 9 ... Processing control unit.

Continuation of the front page (56) Reference JP-A-56-21210 (JP, A) JP-A-61-26120 (JP, A) JP-A-60-233724 (JP, A) JP-A-53-5935 (JP , A) Actual opening 51-8036 (JP, U) Actual opening 62-112730 (JP, U)

Claims (1)

[Claims] 1. An information processing apparatus having a backup power supply for backing up when a voltage drop occurs due to a power failure such as a momentary interruption of the input power supply, for obtaining a stabilized direct current from an AC input to a processing unit as the backup power supply. This is also performed by the output of the power failure detection section that detects when there is a power failure and backup is required, by also using the capacitor provided between the rectification section used for A first processing unit that includes a processing control unit that stops the internal processing, and further includes a portion that holds data necessary for restart when the processing is temporarily stopped and then the processing is restarted. And a second component that does not include a part required for restarting are separated from each other to supply power, and power is supplied to the second component by the output of the power failure detection unit during non-power failure. To And a power supply control unit that stops the power supply to the second component by the output of the power failure detection unit during a power failure, and when the power failure detection unit detects a power failure, the processing control unit is executing When the power supply control unit stops the power supply to the second component unit, power is supplied only to the first component unit, the input power is restored, and the backup state is released, A power supply control method characterized in that the power supply control unit restarts power supply to the second component unit and restarts the process using the data of the first component unit.