JP2593860Y2 - AC uninterruptible power supply - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a one relates <br/> the AC uninterruptible power supply, more specifically consist AC uninterruptible power supply unit of the plurality of line UPS system, one of the AC uninterruptible other AC uninterruptible power without interruption in the event of a failure of the power supply unit
The present invention relates to an AC uninterruptible power supply used in a standby redundant system that can switch to power supply from a power supply unit .

[0002]

2. Description of the Related Art An AC uninterruptible power supply is used for computer load equipment or the like in which an instantaneous interruption of power supply due to a drop in commercial power or a power failure is not allowed. The power supply method of this AC uninterruptible power supply is generally an inverter power supply method, and this method is the mainstream in mass-produced and commercially available general-purpose AC uninterruptible power supply.

In the above-described constant inverter power supply method, since the inverter always supplies power, even if a power failure or the like occurs, power supply is continued by the storage battery, and load power supply is not interrupted instantaneously. Continued.

[0004] illustrating a conventional example of such AC uninterruptible power supply by FIG. Normally, the commercial power supply 1 is received, and the rectifier 6 supplies power to the inverter 8 while charging the storage battery 7. The inverter 8 converts DC to AC, and supplies AC power to the load 5 via a switching unit 9 using an electronic changeover switch. When the commercial power supply 1 drops in voltage or loses power, the rectifier 6 stops, but the inverter 8 continues to operate by being continuously supplied with power from the storage battery 7, and the load 5 is supplied with AC power as usual.

When the commercial power supply 1 is received, the inverter 8
When the inverter 8 or the rectifier 6 fails while supplying power to the load, the switching control unit 10 operates to disable power supply from the switching unit 9 on the output side of the inverter 8 to the switching unit 11 on the commercial bypass line side. Can be switched by momentary interruption.

[0006]

An invention to be Solved] However, in the above-mentioned conventional AC uninterruptible power supply, since the failure of the inverter or the rectifier is powered from a commercial bypass line, that period reduces the power quality, provide bypass There is a disadvantage that the power supply is stopped if there is a commercial power failure during the use of the line.

[0007] The present invention solves the above-mentioned drawbacks, enables continuous supply of high-quality power with little distortion, and further prevents AC power supply from being stopped even when a commercial power supply fails. It is an object to provide an uninterruptible power supply.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a commercial power supply bypass circuit and a rectifier.
And a circuit consisting of a storage battery and an inverter.
Bypass times by detecting the failure of the serial rectifier or inverter
Switching unit for switching to power supply from the road and the switching unit
And a switching control unit that sends out-of-failure signals.
Supply uninterruptible power with the always-on inverter power supply system
Multiple AC uninterruptible power supply units are provided, and the output of each system
Connected to each other via a power switch
The power failure is configured to be supplied, and
The power supply switch monitors the output status of each AC uninterruptible power supply.
Power supply monitor that outputs an abnormal signal when the output status is abnormal.
Visual circuit, the fault signal and the fault signal as the fault signal
A switching control circuit to which a transmission signal is input, the abnormal signal or
From each AC uninterruptible power supply to the load by the failure signal
Electronic changeover switch to switch the power supply of
Is adopted .

Further, considering the universal AC uninterruptible power supply unit which is commercially available as AC uninterruptible power supply, using which a fault outside transmission signal that comes standard as fault detection, for supplying power switch It is like that.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a redundant system using the AC uninterruptible power supply according to the present invention. Components having the same functions as those in FIG. 2 are denoted by the same reference numerals.

The AC uninterruptible power supply of the present invention is a commercial power supply.
1 is connected to a switching unit 11A using an electronic changeover switch.
It comprises a bypass circuit, the rectifier 6A from the commercial power source 1, inverter 8A, the switching unit 9A using an electronic changeover switch
And the switching unit 9A,
A switching control unit AC uninterruptible power supply unit 2 of the A-system having a 10A for controlling 11A, similarly electronic switch to the commercial power supply 1
Bypass circuit connecting switching unit 11B using a switch
The provided, rectifier 6B from the commercial power source 1, inverter 8B,
Uninterruptible power is supplied through a switching unit 9B using an electronic changeover switch , and the switching units 9B and 11B are controlled.
That alternating switching control section 10B of the provided B-based uninterruptible power supply
And a section 3, the output of each system and electronic changeover switches 16 and 17 which are interposed between the switching control circuit 15 for controlling the electronic changeover switch 16, 17 between the output and the load 5 of the system power switch 4 having a power source monitoring circuit 13 for monitoring the state provided to detect a fault outside transmission signal of the AC uninterruptible power supply unit 2, 3 of the respective system fault signal 12A, as 12B, also the power supply monitoring A circuit 13 detects that the output voltages of the respective systems deviate from specified ranges as an abnormal signal 14, and controls the operations of the electronic changeover switches 16, 17 by the changeover control circuit 15. It is.

Next, the operation of the redundant system using the AC uninterruptible power supply of the present invention will be described. Usually alternating current power outage power
Supply unit 2 and 3 are operated at line UPS system to operate synchronously with the commercial power supply 1, one AC uninterruptible power Chikarakyo
The power supply units 2 and 3 supply uninterruptible power to the load 5 via the electronic changeover switch 16 or 17.

[0014] Here, when the inverter 8A AC uninterruptible power supply unit 2 of the A-system are inverter power supply to the load 5 through an electronic changeover switch 16 of the power supply switch 4,
When the rectifier 6A or inverter 8A AC uninterruptible power in the supply unit 2 has failed, the power supply unit 2 itself, the switching section 9
A is turned off, and the switching unit 11 on the bypass circuit side of the commercial power supply is turned off.
A is turned on to switch from the inverter power supply to the commercial bypass power supply. At the same time, a switching control unit 10A transmits a fault outside transmission signal, and in the power supply switch 4, the switching control circuit 15 converts the fault outside transmission signal into a failure signal 12A. receiving OFF the electronic changeover switch 16, and oN the electronic switch 17 of the system B side, the load 5 is AC uninterruptible power supply system B as
Power is supplied by the inverter 8B of the unit 3, and the inverter power supply is continued.

[0015] Next, similarly when the AC uninterruptible power supply unit 2 of the A-system are inverter power supply to the load 5 through an electronic changeover switch 16, when the commercial power source 1 is a power failure, the battery 7A to the inverter 8A Powered, inverter 8
A continues the inverter power supply. Further, when the inverter 8A in this state fails to detect that the output voltage of the AC uninterruptible power supply unit 2 by the power source monitoring circuit 13 of the power supply switch 4 is departing from the scope of the provisions with stopping the drive 8A, An abnormal signal 14 is output to the switching control circuit 15, and the switching control circuit 15
And F, and ON the electronic switch 17 of the system B side, in <br/> inverter power supply by the inverter 8B AC uninterruptible power supply unit 3 of the system B is continued.

On the other hand, the storage battery 7A
In case you are powered from the power failure battery 7A and prolonged discharge inverter 8A rather than failure stops, outputs a fault outside transmission signal for this time AC uninterruptible power supply unit 2 is not a malfunction not but detects that the output voltage of the AC uninterruptible power supply unit 2 by the power source monitoring circuit 13 of the power supply switch 4 is departing from the scope of the provisions with stopping the drive 8A, the abnormal signal to the switching control circuit 15 14
And the changeover control circuit 15 outputs an electronic changeover switch 16
Is turned off and the electronic changeover switch 17 on the B side is turned on.
And, it is powered by an inverter 8B AC uninterruptible power supply unit 3 of the system B-side to the load 5, and continues the inverter power supply. When the commercial power supply 1 fails, both the A-system and the B-system supply power from the storage batteries 7A and 7B. However, the B-system uses a standby state in which the inverter has no load, so that the storage battery 7B discharges very little. After switching to power supply, the battery is substantially discharged.

In the above description, the inverter power supply is switched from the system A to the system B, and the power supply to the load is continued. However, even when the system B first supplies the inverter power, the same operation is performed from the system B to the system A. Switch to

[0018]

[Effect of the invention] above, as described in detail in the examples, redundancy scheme by the AC uninterruptible power supply of the present invention is a power switch provided on the AC uninterruptible power supply unit of the plurality of general purpose, AC uninterruptible power since switching power supply to the load during the force feed unit failure AC uninterruptible power supply unit of the other systems, continuously supplying a small quality power distortion using alternating current uninterruptible power supply unit of the general-purpose it can be further be a failure occurs or a power failure of the AC uninterruptible power supply unit at the time of power failure of the commercial power supply continues to supply also in the case of prolonged.

[Brief description of the drawings]

FIG. 1 is a block diagram of an AC uninterruptible power supply according to the present invention.

FIG. 2 is a block diagram of a conventional AC uninterruptible power supply.

[Explanation of symbols]

1 a commercial power supply 2,3 AC uninterruptible power supply unit 4 Power switch 5 load 6, 6A, 6B rectifier 7, 7A, 7B battery 8, 8A, 8B inverter 9,9A, 9B, 11,11A, 11B switching unit 10, 10A, 10B switching control section 12A, 12B failure signal 13 power supply monitoring circuit 15 switching control circuit 16, 17 electronic switch

────────────────────────────────────────────────── ─── Continuation of the front page (72) Katsuhiko Kano, creator Katsuhiko Kano 6-6, Josaicho, Takatsuki-shi, Osaka Yuasa Battery Co., Ltd. (56) References JP-A-4-58738 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) H02J 9/00-9/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A bypass circuit for a commercial power supply, a rectifier, and power storage.
A circuit comprising a pond and an inverter;
Or, if a fault in the inverter is detected,
A switching unit for switching to power supply and controlling the switching unit
AC uninterruptible power supply with uninterruptible power using the always-on inverter power supply system, both of which have a switching control unit that sends out-of-fault transmission signals
Multiple power supply units are provided, and the output of each system is turned off.
Uninterruptible power to a common load connected to each other
And the power supply switching
The vessel, monitoring the output state of the AC uninterruptible power supply unit, a power supply monitoring circuit output state and outputs an abnormality signal when an abnormality, the fault outside transmission signal as the abnormality signal and the fault signal
A switching control circuit which bets are input, the abnormal signal or failure
Power supply from each AC uninterruptible power supply to load by signal
An AC uninterruptible power supply, comprising: an electronic changeover switch for mutually switching the power supply.