JPH08205427A - Uninterruptible stabilized power supply - Google Patents

Abstract

PURPOSE: To eliminate the power storage unit by using the power storage unit of an uninterruptible normal power supply as the power storage unit of an uninterruptible backup power supply while switching synchronously. CONSTITUTION: When a load line 9 is switched from an uninterruptible normal power supply (PW) 1 to a backup PW 10, a solid state switch 8 of an uninterruptible switching means 6 in the PW 1 is turned on a switching signal. Furthermore, a movable switch 7 is actuated to switch the contact thereof from a terminal (b) to (a). Consequently, the load line 9 is disconnected from the PW 1 and connected with the PW 10. The uninterruptible switching means 6 and the switching means 20 for the PW 1 are also actuated by the switching signal. In other words, a solid state switch 22 is turned on and a movable switch 21 is actuated to switch the contact thereof from a terminal (b) to (a). Consequently, a power storage unit 4 is switched from the A/D conversion means 3 therefor to a common line 19 connected with an A/D conversion means 13 in the PW 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables a plurality of regular uninterruptible power supply units and a single backup uninterruptible power supply unit to be switched to each other without interruption for supply to a load, particularly a medium or large capacity load. Configured uninterruptible stabilized power supply (Unint
RURPTABLE PWER SUPPLY (UPS for short) device.

[0002]

2. Description of the Related Art Conventionally, as a power supply device for a computer, an uninterruptible power supply unit for regular use and an uninterruptible power supply unit for backup can be switched to each other without interruption for supply to a load. Power supplies are often used. In particular, when a plurality of computer system groups are constructed, a dedicated uninterruptible power supply device is provided for each system group due to risk dispersion and the like, and a common backup uninterruptible power supply device is provided. Then, when any of the regular uninterruptible power supply units fails or during maintenance inspection, etc., switching from each regular uninterruptible power supply unit to the backup uninterruptible power supply unit can be performed without interruption by an automatic or manual switching signal. When the failure or the like is recovered, the backup uninterruptible power supply is switched to the regular uninterruptible power supply again without interruption.

FIG. 3 is a system diagram of a conventionally used uninterruptible stabilized power supply device. A plurality (three in this example) of the regular uninterruptible power supply devices 1 includes an AC / DC converter 3 using a thyristor or the like to which an AC power supply 2 is input, and a power storage device 4 and a thyristor connected to the output side thereof. Direct using
The AC / DC converter 5 and the non-instantaneous interruption switching unit 6 provided on the output side of the direct-AC converter 5 are included. The non-instantaneous-interruption switching means 6 has, for example, a movable switch 7 of a two-point switching type and a solid-state switch 8 such as a thyristor, and one switching terminal b of the movable switch 7 is connected to the output of the direct-to-AC conversion means 5. The other switching terminal a is connected to one end of the solid-state switch 8 and the common wiring 11. The common wiring 11 is connected to the output of the backup uninterruptible power supply 10. And the common terminal c of the movable switch 7
The load wiring 9 and the other end of the solid state switch 8 are connected to. This movable switch 7 is an exciting coil (not shown)
The contact is switched from the switching terminal b to the switching terminal a by applying a current to the switching terminal b.

The uninterruptible power supply 10 for backup is
The AC / DC converter 13 to which the AC power supply 2 is input, the power storage device 14 and the DC / AC converter 1 connected to the output side thereof.
5. The non-instantaneous switching unit 16 connected to the output side of the direct-to-AC conversion unit 15 is used. Usually, these devices are the same as the devices constituting the regular uninterruptible power supply 1. . However, the common terminal c of the hitless switching means 16 is connected to the common wiring 11, and the switching terminal a is connected to the AC power supply 2. Next, the operation of this conventional device will be described. For example, each uninterruptible power supply device 1 in common use converts the alternating current supplied from the alternating current power supply 2 into direct current by the alternating-direct conversion means 3, and outputs the direct current output to the power storage device 4. At the same time as being charged, it is input to the direct-to-alternative conversion means 5 where it is converted into alternating current again. Then, this output is supplied to the load wiring 9 through the movable switch 7 of the hitless switching means 6. The power storage device 4 is the AC / DC converter 3.
Of the AC power supply 2 and a function as a temporary power supply source when the AC power supply 2 fails. on the other hand,
The uninterruptible power supply 10 for backup is always the AC power supply 2
The AC-to-DC converter 13 converts the AC into a DC, and the DC output charges the power storage device 14 to put it in a standby state.

When a failure occurs in any of the regular uninterruptible power supplies 1, or when maintenance is required,
First, by turning on the solid-state switch 8 in the uninterruptible power supply device 1 by the switching signal and operating the movable switch 7 to switch its contact from the state shown in the figure,
The load wiring 9 switches from the output of the uninterruptible power supply 1 to the output of the backup uninterruptible power supply 10 without instantaneous interruption. The uninterruptible switching means 16 in the backup uninterruptible power supply 10 is an AC power supply from the AC power supply 2 to the load wiring 9 when the regular uninterruptible power supply 1 or the backup uninterruptible power supply 10 is overloaded. Are provided to allow direct supply.

[0006]

In the above uninterruptible stabilized power supply device, the power storage device in each uninterruptible power supply device is usually composed of storage batteries such as alkaline storage batteries in a series-parallel group, but when the load capacity is large, It is necessary to increase the capacity accordingly. Although recent storage batteries have greatly improved their performance and reliability, many storage batteries must be installed in order to have such a large capacity,
This requires a large space for that and causes an increase in equipment cost. Then, this invention makes it a subject to solve these problems.

[0007]

SUMMARY OF THE INVENTION That is, the present invention is provided with a plurality of regular uninterruptible power supply units and one backup uninterruptible power supply unit, and the output of each regular uninterruptible power supply unit and the backup uninterruptible power supply unit. The uninterruptible stabilized power supply device is configured so that the outputs of the uninterruptible power supply devices can be switched to each other without interruption by the uninterruptible switching device and supplied to the load. Each regular uninterruptible power supply has an AC / DC converting means, a power storage device and a DC / AC converting means connected to its output side, and a backup uninterruptible power supply has an AC / DC converting means and its output. It has a direct-to-acoustic conversion means connected to the side. Further, each power storage device provided in each regular uninterruptible power supply device has a switching means synchronized with a switching signal of the non-instantaneous power interruption switching means, and has an output side of its own AC / DC converting means and a backup power source. It is characterized in that it is adapted to switch between the output side of the AC-DC converting means in the power failure power supply. In a preferred embodiment of the uninterruptible stabilized power supply device of the present invention, the switching means is provided between the output side of its own AC / DC converting means and the output side of the AC / DC converting means in the backup uninterruptible power supply. It is designed to switch without interruption.

[0008]

The uninterruptible stabilized power supply device of the present invention does not include a power storage device in the backup uninterruptible power supply device, and when the output is supplied to the load by switching from any of the regular uninterruptible power supply devices. In synchronization with the switching, the power storage device of the regular uninterruptible power supply device is switched and used as the power storage device of the backup uninterruptible power supply device. Therefore, the power storage device required for the backup uninterruptible power supply is omitted by simply providing the simple switching means, and the space required as the uninterruptible stabilized power supply can be greatly suppressed and the cost can be reduced.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a system diagram showing an example of an uninterruptible stabilized power supply device according to the present invention, in which devices having the same functions as those in FIG. 3 are designated by the same reference numerals. In the figure, the power storage device 4 of each regular uninterruptible power supply 1 is switched by the switching means 20 that operates in synchronization with the switching signal to the uninterruptible switching means 6 to switch its own AC-DC converter 3.
Common wiring 1 connected to the output side of the AC power supply and the output side of the AC / DC converter 13 in the backup uninterruptible power supply 10.
It is designed to switch between 9 and 9.

The switching means 20 has a two-point switching type movable switch 21 and a solid state switch 22 such as a thyristor. The power storage device 4 is connected to the common terminal c of the movable switch 21, one switching terminal b is connected to the output side of its own AC / DC converting means 3, and the other switching terminal a is connected to the common wiring 19. There is. The power storage device 4 and the common wiring 1
The switch 9 is bypassed by the solid-state switch 22.
The two-point switching type movable switch 21 has its contact switched from the switching terminal b to a by passing a current through its exciting coil (not shown). Further, the movable switch 21 may use a set of contacts that are turned on and off when activated, one end of which is connected as a common terminal and the other end of which is used as a switching terminal. Since the movable switch 21 requires a certain time for switching, by providing the solid-state switch 22 as a bypass, the backup uninterruptible power supply 10 can be started more smoothly.

The solid-state switch 22 may use a diode in addition to the thyristor. Solid switch 2
When a diode is used as 2, the anode side is connected to the common wiring 19 and the cathode side is connected to the power storage device 4.
Although the illustrated system diagram is simplified and shown by a single line, for example, in the case of a two-phase circuit, actually, as shown in FIG. 2A, a pair of thyristors 18a and 18b are used in reverse parallel as the solid state switch 22, As shown in FIG. 2B, the thyristor 18
A and the diode 18c are used in antiparallel. As another method, a bidirectional thyristor or the like may be used. In addition to the type shown in the figure, the two-point changeover type movable switch 7 uses a set of contacts that are turned on and turned off during operation. It may be a switching terminal.

Next, the operation of the above device will be described. When switching the load wiring 9 from the output of any one of the regular uninterruptible power supply 1 to the output of the backup uninterruptible power supply 10, first, the regular uninterruptible power supply is generated by a switching signal output from a control unit (not shown). The solid switch 8 of the hitless switching means 6 in the device 1 is turned on and the movable switch 7 is operated to switch the contact from the switching terminal b to a. By this switching operation, the load wiring 9 is disconnected from the output of the regular uninterruptible power supply 1 and connected to the output of the backup uninterruptible power supply 10. The solid-state switch 8 may remain on after that, or may be turned off at an appropriate time.

The switching signal output from the control section operates the uninterruptible switching means 6 and, in synchronization with it, operates the switching means 20 of the regular uninterruptible power supply 1.
That is, the solid-state switch 22 is turned on by the switching signal and the movable switch 21 is operated to switch the contact from the switching terminal b to a. As a result, the power storage device 4 is connected instantaneously and without interruption to the common wiring 19 connected from the output side of its own AC / DC converter 3 to the output side of the AC / DC converter 13 in the backup uninterruptible power supply 10. Switch to. The solid-state switch 22 may remain on after that, or may be turned off at an appropriate time.

Next, when the load wiring 9 is switched from the output of the backup uninterruptible power supply 10 to the original output of the normal uninterruptible power supply 1, the normal operation is performed by a switching signal output from a control unit (not shown). If the solid-state switch 8 of the uninterruptible switching means 6 in the uninterruptible power supply 1 is not turned on, it is turned on and the movable switch 7 is turned on.
The contact of is switched from the switching terminal a to b. By this switching, the output of the regular uninterruptible power supply 1 is connected. The solid state switch 8 is then turned off at the appropriate time, and the load wiring 9
And the output of the backup uninterruptible power supply 10 is disconnected. Similarly, the switching signal output from the control unit operates the switching means 20 of the regular uninterruptible power supply 1. That is, when the solid-state switch 22 is not turned on, it is turned on and the movable switch 21 is turned on.
The contact of is switched from the switching terminal a to b. As a result, the power storage device 4 is uninterrupted and the backup uninterruptible power supply device 1 is used.
At 0, the common wiring 19 connected to the output side of the AC / DC converter 13 is switched to the output side of the AC / DC converter 3 of its own. The solid state switch 22 is then turned off at the appropriate time.

As described above, the power storage device 4 is connected to the output side of its own AC / DC converting means 3 and the output side of the AC / DC converting means 13 of the backup uninterruptible power supply 10 without interruption. It can be switched to and from the wiring 19.
Further, the two-point switching type movable switch 21 in the switching means 20 may be an overlap type movable switch (a movable switch that switches while switching the contacts between the switching terminals a and b). When such a movable switch is used, the power storage device 4 is alternately switched between the output side of its own AC / DC converting means 3 and the output side of the AC / DC converting means 13 in the backup uninterruptible power supply 10 without interruption. It is possible to switch to. In that case, the solid state switch 22 may be omitted.

[0016]

As described above, the uninterruptible stabilized power supply device of the present invention does not have the power storage device required for the backup uninterruptible power supply device, and can be used for backup from any regular uninterruptible power supply device. When switching to the UPS uninterruptible power supply and supplying its output to the load, the power storage device of the regular uninterruptible power supply should be switched to the backup power storage device of the uninterruptible power supply in synchronization with the switching. Therefore, the power storage device required for the backup uninterruptible power supply can be omitted by simply providing the simple switching means, and the space required as the uninterruptible stabilized power supply can be significantly suppressed and the cost can be reduced. Especially self-
By switching between the output side of the direct conversion means and the output side of the AC-to-direct conversion means in the backup uninterruptible power supply without interruption, the disturbance of the voltage supplied to the load at the time of switching. Can be suppressed, and a smoother switching operation can be performed.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of an uninterruptible stabilized power supply device of the present invention.

FIG. 2 is a specific circuit diagram of a solid-state switch 22 shown in FIG.

FIG. 3 is a system diagram of a conventional uninterruptible stabilized power supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Regular uninterruptible power supply 2 AC power supply 3 AC / DC conversion means 4 Power storage device 5 DC / AC conversion means 6 Instantaneous interruption switching means 7 Movable switch 8 Solid switch 9 Load wiring 10 Uninterruptible power supply for backup 11 Common Wiring 13 AC / DC conversion means 14 Power storage device 15 DC / AC conversion means 16 Non-interruption switching means 17 Movable switch 18 Solid state switch 18a Thyristor 18b Thyristor 18c Diode 19 Common wiring 20 Switching means 21 Movable switch 22 Solid state switch

Claims (2)

[Claims] 1. A plurality of regular uninterruptible power supplies 1 and one backup uninterruptible power supply 10 are provided, and the output of each regular uninterruptible power supply 1 and the output of the backup uninterruptible power supply 10. In the uninterruptible stabilized power supply device configured to be able to switch to each other without interruption by the uninterruptible switching means 6 and to supply to the load, each regular uninterruptible power supply device 1 includes the AC / DC converting means 3 and its converter. The backup uninterruptible power supply device 10 has a power storage device 4 and a direct-to-AC converter 5 connected to the output side, and the backup uninterruptible power supply 10 includes an AC-to-DC converter 13 and a direct-to-AC converter 15 connected to the output side. Each power storage device 4 provided in each regular uninterruptible power supply 1 has a switching means 20 that synchronizes with the switching signal of the uninterruptible switching means 6.
Thus, the output side of the own AC / DC converter 3 and the AC / DC converter 13 in the backup uninterruptible power supply 10 are provided.
An uninterruptible stabilized power supply characterized in that it is adapted to switch between the output side and the output side. 2. The switching means 20 is its own AC / DC converting means 3.
2. The uninterruptible stabilized power supply device according to claim 1, wherein the output side of the power supply is switched to the output side of the AC / DC converting means 13 in the backup uninterruptible power supply 10 without instantaneous interruption.