JPH09327134A - Uninterruptible power-supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an uninterruptible power-supply apparatus by which the power supply of an information processor or the like can be turned on automatically without the intermediary of man power by providing a power-supply turning-on-signal output circuit which inputs a power-supply turning-on signal to a utilization device as long as a power-failure detection signal is stored in a storage means when a commercial AC power supply is restored. SOLUTION: The occurrence of a power failure is stored by a latching relay 18. When a commercial AC power supply is restored after that, a power-supply turning-on signal S3 instead of a power-supply turning-on switch 24 is input to a terminal device 2 by the AND condition of the storage signal of the latching relay 18 and of a signal indicating that the commercial AC power supply is restored, and the power supply of the terminal device 2 is turned on automatically. Consequently, when the commercial AC power supply is restored after the power failure, the power supply of the terminal device 2 can be turned on without the intermediary of man power. As a result, it is possible to prevent a drop in the operating ratio of the terminal device 2 due to a situation that an operator does not realize the restoration of the commercial AC power supply after the power failure.

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 system for backing up AC power supply to a device using AC power supply such as a personal computer and a workstation.

[0002]

2. Description of the Related Art In an information processing apparatus such as a personal computer or a workstation, when a commercial AC power source fails, data being processed is lost or destroyed.

Therefore, in this type of information processing apparatus, a battery and an inverter for converting the DC output voltage of the battery into an AC power supply are provided, and when the commercial AC power supply fails, the output AC power supply of the inverter is used as the commercial AC power supply. An uninterruptible power supply device that supplies the information processing device instead of the power supply is added as necessary.

When the conventional uninterruptible power supply detects a power failure of the commercial AC power supply, it immediately switches to the backup state by the inverter and sends a power failure report signal to the information processing apparatus for processing in the information processing apparatus. If the termination processing such as saving data on the way is executed and the battery backup stop signal is returned from the information processing device to the uninterruptible power supply upon completion of the termination processing,
It was configured to stop the backup by the inverter and prevent wasteful consumption of the battery.

[0005]

However, in the conventional uninterruptible power supply, since no consideration is given to the response when the commercial AC power is restored, when the commercial AC power is restored, There has been a problem that the power-on switch of the information processing device has to be manually operated to turn on the power of the information processing device, which makes it difficult to deal with power recovery.

If the clerk does not notice that the power is restored after a temporary power failure due to the absence of a clerk or the like, the state in which the power is not turned on continues until the clerk notices it, and information processing is performed. There was a problem that the operating rate of the device decreased.

An object of the present invention is to provide an uninterruptible power supply device capable of automatically turning on the power supply of an information processing device or the like without manual intervention when the commercial AC power supply temporarily loses power and is restored. To do.

[0008]

In order to achieve the above object, the uninterruptible power supply of the present invention has a storage means for storing a power failure detection signal indicating that the commercial AC power supply has failed, and a recovery means for the commercial AC power supply. A power-on signal output circuit for inputting a power-on signal to a commercial alternating-current power-supply-using device such as an information processing device when a power failure detection signal is stored in the storage means when power is supplied.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of an uninterruptible power supply to which the present invention is applied. The uninterruptible power supply 1 of this embodiment is input via a plug 10 and a circuit breaker 11. Commercial AC power supply (AC100V)
A power failure detection circuit 12 for detecting that a power failure has occurred, a charging circuit 13 for converting a commercial AC power supply into a DC voltage to charge the battery 14, and an output voltage of the battery 14 having the same voltage and the same frequency as the commercial AC power supply. And an inverter 15 for converting into a power source.

The AC power source output from the inverter 15 is input to the socket 17 which is an AC power source output terminal through the switch 16 which is switched to the b side when the commercial AC power source input from the plug 10 has a power failure.

The switch 16 is switched to the b side by a switching signal CS1 shown by a broken line when the power failure detection circuit 12 detects a power failure of the commercial AC power supply (AC100V).

The uninterruptible power supply 1 further includes a latching relay 18 for storing a power failure detection signal S2 output from the power failure detection circuit 12 when the commercial AC power supply (AC100V) fails, and an inversion for inverting the power failure detection signal S2. Circuit 19
And a closing contact 18M of the latching relay 18 that is connected in series to the output of the inverting circuit 19 and that outputs the output signal of the inverting circuit 19 as the power-on signal S3 while the latching relay 18 stores the power failure detection signal. And an AND circuit 20 that resets the latching relay 18 by detecting that the battery backup stop signal is returned from the terminal device 2 after outputting the power-on signal S3.

The power failure detection signal S2 is input to the terminal device 2 as a power failure report signal S4.

On the other hand, the terminal device 2 which is a device for utilizing the commercial AC power supply uses the AC power supply from the plug 26 connected to the socket 17 to generate various kinds of DC voltage required internally, and the non-locking device. Power switch 24
When the power-on switch 24 is turned on or the power-on signal S3 is input from the uninterruptible power supply 1, the power-supply control circuit 27 that controls the power supply 23 to the operating state.
When the power failure report signal S4 is input, a termination process such as saving data in the process to a disk memory or the like is performed, and when the termination process is completed, the battery backup stop signal S5 is transmitted to the uninterruptible power supply unit. And an end processing circuit 25 for replying to 1.

Next, the operation of the uninterruptible power supply 1 will be described with reference to the time chart of FIG.

First, the commercial AC power source (A
When a power failure occurs at (C100V) at time t1 as shown in FIG. 2A, the power failure detection circuit 12 detects this and switches the switch 16 to the b side by the switching signal CS1.

Then, the output AC power source of the inverter 15 is supplied to the terminal device 2 through the switch 16 as an alternative power source of the commercial AC power source (AC100V). That is, as shown as UPS output in FIG. 2B, the uninterruptible power supply 1 is in a backup state.

In this case, the battery 14 is constantly charged by the charging circuit 13 in the energized state, and the charging voltage thereof is converted into the AC power source by the inverter 15.

The power failure detection circuit 12 switches the switch 16, outputs the power failure detection signal S2, and sets the latching relay 18. As a result, the fact that the power supply state has been changed to the power failure state is stored in the latching relay 18.

The power failure detection signal S2 is input to the termination processing circuit 25 of the terminal device 2 as a power failure report signal S4 as shown in FIG. 2 (c).

When the power failure report signal S4 is input, the termination processing circuit 25 of the terminal device 2 performs termination processing such as saving the data being processed in the disk memory or the like, and when the termination processing is completed. For example, as shown in FIG. 2D, the battery backup stop signal S5 is transmitted to the uninterruptible power supply 1
Reply to.

Upon receiving the battery backup stop signal S5, the power failure detection circuit 12 determines that the terminal device 2 has completed the termination processing and may cancel the backup state, and in response to the switching signal CS1, switches 16 to the a side. Return to.

As a result, the backup state for the terminal device 2 is released.

After the termination process of the terminal device 2 is completed,
The backup state is canceled in order to prevent wasteful consumption of the battery 14.

When the commercial AC power supply (AC 100V) is restored at time t2 after the backup is released, the power failure detection circuit 12 does not enter the power failure detection status. That is, during a power failure, the power failure detection signal S2 and the power failure report signal S4 indicating "1" level are held at "0" level.

Then, the output signal of the inverting circuit 19 which inverts the power failure report signal S4 becomes "1" level, and the "1" level signal is output as the power-on signal S3 through the closing contact 18M of the latching relay 18. .

That is, a commercial AC power supply (AC100V)
Is restored, a power failure occurs before the restoration, and the AND condition that the closing contact 18M of the latching relay 18 is closed is satisfied, and the terminal device 2 is operated at the timing shown in FIG. The power-on signal S3 is output to.

The power-on signal S3 is input to the power supply control circuit 27 as a logical sum signal with the output of the non-lock type power-on switch 24. As a result, in the power supply control circuit 27, the state becomes equivalent to the state where the power-on switch 24 is turned on, and the power supply 23 is operated.

As a result, the terminal device 2 enters a normal operating state. When the terminal device 2 enters the normal operating state, the battery backup signal S5 becomes "1" level as shown in FIG. 5 (d).

When the battery backup signal S5 becomes "1" level, the AND condition with the power-on signal S3 is satisfied, and the AND circuit 20 outputs the reset signal of the latching relay 18. As a result, the latching relay 18 returns to the reset state.

After that, even if the commercial AC power supply fails again, the power of the terminal device 2 is automatically turned on by the same operation.

As described above, in the present embodiment, the fact that a power failure has occurred is stored in the latching relay 18, and after the power is restored, the latching relay 1
The power-on signal S replacing the power-on switch 24 depending on the AND condition between the memory signal of 8 and the signal indicating that the power is restored.
Since 3 is input to the terminal device 2 and the power of the terminal device 2 is automatically turned on, it is possible to turn on the power of the terminal device 2 without manual intervention at the time of power restoration after a power failure.

As a result, it is possible to prevent a decrease in the operating rate of the terminal device 2 due to the fact that the staff member does not notice the power recovery after the power failure.

In this embodiment, the occurrence of a power failure is stored by the latching relay 18, but a storage element that is directly backed up by the DC voltage of the battery 14 (or its divided voltage) may be used. Good.

[0036]

As described above, according to the present invention, a storage means for storing a power failure detection signal indicating that the commercial AC power supply has failed, and a power failure detection signal in the storage means when the commercial AC power supply is restored. Is stored, a new power-on signal output circuit for inputting a power-on signal to the commercial AC power source utilization device such as an information processing device is provided. When the power is turned on, the power of the information processing device or the like can be automatically turned on without manual intervention. Then, it is possible to prevent a decrease in the operating rate of the information processing device or the like due to the fact that the staff does not notice the power recovery after the power failure.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of an uninterruptible power supply to which the present invention is applied.

FIG. 2 is a time chart for explaining the operation in the embodiment of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Uninterruptible power supply device, 2 ... Terminal device, 12 ... Power failure detection circuit, 13 ... Charging circuit, 14 ... Battery, 15 ... Inverter, 16 ... Switch, 18 ... Latching relay, 20 ...
AND circuit, 24 ... Power-on switch, 25 ... End processing circuit.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location H02M 7/48 G06F 1/00 341K (72) Inventor Takahiko Shirakawa 1 Ikegami, Haruoka-cho, Owariasahi-shi, Aichi Stock Company Hitachi Asahi Electronics (72) Inventor Yoshifumi Hori 1 120-120, Sachimachi, Inazawa, Aichi Chubu Hitachi Electric Co., Ltd.

Claims (1)

[Claims] 1. A battery and an inverter that converts a DC output voltage of the battery into an AC power supply, and supplies the output AC power of the inverter to a utilization device that uses the commercial AC power when the commercial AC power fails. In the uninterruptible power supply to do, storage means for storing a power failure detection signal indicating that the commercial AC power supply has failed, and when the commercial AC power supply is restored, if the power failure detection signal is stored in the storage means, An uninterruptible power supply device comprising: a power-on signal output circuit for inputting a power-on signal to the utilization device.