JPH0629350U - AC uninterruptible power supply - Google Patents

Abstract

(57) [Abstract] [Purpose] An AC uninterruptible power supply unit used in an AC uninterruptible power supply system can continuously supply high-quality power with little distortion, and also supply it during a power outage of a commercial power supply. It is an object of the present invention to provide an AC uninterruptible power supply device that does not stop. [Structure] AC uninterruptible power supply units 2 and 3 of a plurality of systems for supplying uninterruptible power by a constant inverter power supply system having a bypass circuit of a commercial power supply, and electronic devices are provided between an output of each system and a load 5. A switching control circuit 15 for interposing the type changeover switches 16 and 17 and controlling the operation of the electronic type changeover switches 16 and 17, and a power supply monitoring circuit 13 for monitoring the output state of each AC uninterruptible power supply device 2 and 3 are provided. The AC uninterruptible power supply of the system in which the failure or abnormality occurs by controlling the electronic changeover switches 16 and 17 by the failure signals 12A and 12B from the AC uninterruptible power supplies 2 and 3 or the abnormality signal 14 from the power supply monitoring circuit. An AC uninterruptible power supply having a function of switching the power supply to the load 5 of the power supply from the AC uninterruptible power supply of another system without interruption.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an AC uninterruptible power supply system, and more specifically, it is composed of a plurality of AC inverter uninterruptible power supply devices of a continuous inverter power supply system, and when one AC uninterruptible power supply device fails, the other AC The present invention relates to an AC uninterruptible power supply used in a standby redundant system that can switch to power supply from the uninterruptible power supply.

[0002]

[Prior art]

 The AC uninterruptible power supply system is used for computer load equipment, etc., where the interruption of power supply due to a reduction in commercial power supply or a power failure is not allowed. The power supply method for this AC uninterruptible power supply is generally the inverter power supply method, and this method is the mainstream for mass-produced and commercially available general-purpose AC uninterruptible power supply.

In the above-mentioned constant inverter power supply system, since the inverter constantly supplies power, power is continuously supplied by the storage battery even if a power failure or the like occurs, load power is not interrupted instantaneously, and power is supplied to load equipment. Continued.

A conventional example of such an AC uninterruptible power supply system will be described with reference to FIG. Normally, the commercial power source 1 is received, and the rectifier 6 charges the storage battery 7 and supplies power to the inverter 8. The inverter 8 converts direct current into alternating current and supplies alternating current power to the load 5 via the electronic changeover switch 9. When the commercial power supply 1 drops in voltage or loses power, the rectifier 6 stops, but the inverter 8 continues to operate by continuing to be supplied with power from the storage battery 7, and the load 5 is supplied with normal AC power. .

Further, when the inverter 8 or the rectifier 6 fails while the commercial power source 1 is receiving power and the inverter 8 is supplying power to the load, the operation of the switching control circuit 10 causes the output side of the inverter 8 to operate. The electronic changeover switch 9 switches the power supply from the electronic changeover switch 11 on the commercial bypass line side without interruption.

[0006]

[Problems to be solved by the device]

 However, in the conventional AC uninterruptible power supply system as described above, power is supplied from the commercial bypass line when the inverter or rectifier fails, so the quality of the power is reduced during that period, and the commercial power supply fails during the use of the bypass line. However, there was a drawback that the power supply stopped.

The present invention solves the above-mentioned drawbacks, can constantly supply high-quality power with little distortion, and does not stop the power supply even when the commercial power supply is interrupted. An object is to provide an AC uninterruptible power supply.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the AC uninterruptible power supply of the present invention has a plurality of AC uninterruptible power supply for supplying uninterruptible power to the load by the constant inverter power supply method. An electronic changeover switch is inserted between the load and the electronic changeover switch, and when the inverter or rectifier fails, that is, when the AC uninterruptible power supply unit fails, load power is supplied to the AC uninterruptible power supply of other systems. The inverter can be switched to the standby inverter of the device without any interruption.

Further, a commercially available general-purpose AC uninterruptible power supply is considered as the AC uninterruptible power supply, and a power supply switching is performed by using a fault external transmission signal that is standardly provided in this as a fault detection. It was done.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawing 1.

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

The AC uninterruptible power supply device of the present invention is similar to the A-system AC uninterruptible power supply device 2 that supplies uninterruptible power from the commercial power supply 1 through the rectifier 6A, the inverter 8A, and the electronic changeover switch 9A. It has a B-system AC uninterruptible power supply device 3 that supplies uninterruptible power from a commercial power source 1 via a rectifier 6B, an inverter 8B, and an electronic switching switch 9B, and between the output of each system and a load 5. The electronic changeover switches 16 and 17 are inserted, and a switching control circuit 15 that controls the electronic changeover switches 16 and 17 and a power supply monitoring circuit 13 that monitors the output state of each system are provided. Failure of AC uninterruptible power supply device External transmission signals are detected as failure signals 12A and 12B, and the power supply monitoring circuit 13 detects that the output voltage of each system has deviated from the specified range. Su The power switch 4 controls the operations of the switches 16 and 17.

Next, the operation of the redundant system by the AC uninterruptible power supply of the present invention will be described. Normally, the AC uninterruptible power supplies 2 and 3 are operated by a constant inverter power supply system that operates synchronously with the commercial power supply 1, and either AC uninterruptible power supply is connected to the load 5 via the electronic changeover switch 16 or 17. It supplies uninterruptible power.

Here, when the inverter 8 A of the AC uninterruptible power supply 2 of the system A supplies the inverter 5 to the load 5 via the electronic changeover switch 16 in the power switch 4, the AC uninterruptible power supply When the rectifier 6A or the inverter 8A in 2 fails, the device 2 itself turns off the electronic changeover switch 9A and turns on the electronic changeover switch 11A on the commercial bypass line side to switch from the inverter power supply to the commercial bypass power supply. However, at the same time, the fault external transmission signal 12A is transmitted, and in the power source switching unit 4, the switching control circuit 15 receives the fault signal 12A and turns off the electronic type changeover switch 16 to turn on the electronic type changeover switch 17 on the B system side. The power is turned on and the load 5 is fed by the inverter 8B of the AC uninterruptible power supply 3 on the B system side, and the inverter feeding is continued.

Next, when the commercial power supply 1 fails while the A-system AC uninterruptible power supply 2 is supplying power to the load 5 via the electronic changeover switch 16 by inverter, power is supplied from the storage battery 7A to the inverter 8A. Is supplied, and the inverter 8A continues to feed the inverter. Furthermore, if the inverter 8A fails in this state, the power supply monitoring circuit 13 in the power supply switching unit 4 detects that the power voltage of the AC uninterruptible power supply 2 has deviated from the specified range when the inverter 8A is stopped, and switching is performed. The abnormal signal 14 is output to the control circuit 15, the switching control circuit 15 turns off the electronic changeover switch 16, the electronic changeover switch 17 on the B side is turned on, and the inverter of the AC uninterruptible power supply 3 of the B system It is continued with the inverter power supply from 8B.

On the other hand, when power is supplied from the storage battery 7A due to the power failure of the commercial power supply 1, if the power failure is prolonged and the power failure is prolonged and the storage battery 7A is discharged and the inverter 8A is stopped, the AC uninterruptible power supply device is operated at this time. No. 2 does not output a fault external transmission signal because it is not a fault, but the power supply monitoring circuit 13 in the power source switching unit 4 has determined that the power voltage of the AC uninterruptible power supply 2 has deviated from the specified range when the inverter 8A is stopped. Is detected, the abnormal signal 14 is output to the switching control circuit 15, the switching control circuit 15 turns off the electronic changeover switch 16, the electronic changeover switch 17 on the B side is turned on, and the load 5 uses the B system. Power is supplied by the inverter 8B of the AC uninterruptible power supply 3 on the side, and the inverter power supply continues. When the commercial power source 1 fails, both the A system and the B system supply power with the storage batteries 7A and 7B. However, the B system has a very low discharge of the storage battery 7B because the inverter is in a standby state with no load. After switching to the inverter power supply of the system, it is substantially discharged.

The above description has explained that the inverter power supply is switched from the A system to the B system and the power supply to the load is continued. However, even when the B system is first supplying the inverter power, the same effect is obtained by the B system. It switches from A system.

[0018]

[Effect of device]

 As described above in detail in the embodiments, the redundant method using the AC uninterruptible power supply of the present invention switches the power supply to the load to the AC uninterruptible power supply of another system when the AC uninterruptible power supply fails, so that the distortion It is possible to continuously supply high-quality power with less power consumption.In addition, it is possible to continue supplying power even when a failure occurs in the AC uninterruptible power supply during a power failure of the commercial power supply or when the power outage is prolonged. it can.

[Brief description of drawings]

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

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

[Explanation of symbols]

1 Commercial power supply 2, 3 AC uninterruptible power supply device 4 Power supply switch 5 Load 6, 6A, 6B Rectifier 7, 7A, 7B Storage battery 8, 8A, 8B Inverter 9, 9A, 9B, 11, 11A, 11B, 16, 17
Electronic changeover switch 10, 10A, 10B, 15 Changeover control circuit 12A, 12B Failure signal 13 Power supply monitoring circuit 14 Abnormal signal

Front page continuation (72) Inventor Katsuhiko Kano 6-6 Josaimachi, Takatsuki City, Osaka Prefecture Yuasa Battery Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An AC uninterruptible power supply system for a plurality of systems for supplying uninterruptible power by a constant inverter power supply system including a bypass circuit for a commercial power supply, and electronic switching between an output and a load of each system. A switching control circuit that inserts a switch and controls the operation of this electronic changeover switch and a power supply monitoring circuit that monitors the output status of each AC uninterruptible power supply are provided, and a failure signal or power supply from each AC uninterruptible power supply is provided. The electronic changeover switch is controlled by an abnormality signal from the monitoring circuit, and the power supply to the load of the AC uninterruptible power supply of the system where the failure or abnormality has occurred is switched to the power supply from the AC uninterruptible power supply of the other system without interruption. AC uninterruptible power supply characterized by having functions.