KR101230915B1 - Parallel uninterruptible power supply system using single phase fet inverter module for telecommunication application - Google Patents

Abstract

PURPOSE: A parallel uninterruptible power supply system for communication using a single phase FET inverter module is provided to reduce storage battery installation costs by using a storage battery installed in a conventional 48V DC power supply. CONSTITUTION: A 48V DC power supply(10) includes a three phase AC/DC rectifier(11) and a storage battery(12). A three phase AC/DC rectifier converts three phase power into 48V DC. A single phase inverter module(100) receives single AC power from an output side and converts AC into DC. A bypass path switch unit(200) inputs the single phase AC power to the single phase inverter module. A main controller(300) controls the single phase inverter module and the bypass path switch unit. A main display(310) displays an operation state. [Reference numerals] (10) 48V DC power supply; (100) Single phase inverter module; (11) AC/DC rectifier; (12) Storage battery(48VDC); (300) Main controller; (310) Main display; (AA) Three phase power supply; (BB) DC load(existing communication device); (CC) USP(uninterruptible power supply) based on a signal phase inverter module; (DD) Single phase 220VAC; (EE) AC load(new communication device); (FF) Single phase power supply

Description

Parallel Uninterruptible Power Supply System using Single Phase FET Inverter Module for Telecommunication Application}

The present invention relates to an uninterruptible power supply system for a communication device, and more particularly, in order to easily accommodate an AC load added to an existing 48V uninterruptible power supply system, by adding only a single-phase inverter module, it is possible to increase the load. The present invention relates to a parallel uninterruptible power supply system for communication using a single phase FM inverter module.

In the past, most of the voice services using 48V DC power supply mainly used for telecommunication equipment, so the 48V DC power supply capable of supplying uninterrupted power by storage battery occupied most of the communication power supply system.

However, due to the rapid development of IT technology, DC is rapidly changing due to the rapid change of information and communication environment such as the combination of voice and data, the integration of wire / wireless communication and the convergence of communication and broadcasting, and the combination of information and home appliances. There is an increasing number of telecommunication equipment that uses AC power rather than telecommunication equipment that uses power. Accordingly, in order to cope with the newly added AC load, there is an increasing need to separately install an uninterruptible power supply and a storage battery.

1 is a configuration diagram of an uninterruptible power supply for additional installation for an additional AC load in a conventional 48V DC power supply, as shown, 48V DC power supply 10 is a three-phase power supply AC / DC rectifier ( 11) After receiving the input to convert to 48V DC power, the battery 12 is charged, and is configured to supply the 48V DC power charged in the battery 12 to the existing communication device as a DC load. As such, in order to use a new communication device requiring AC power in the conventional 48V DC power supply 10, an uninterruptible power supply and a storage battery must be additionally installed.

That is, as shown in Figure 1, as a power equipment additionally installed in a 48V DC power supply, AC / DC rectifier 21 and AC / DC rectifier 21 for receiving a three-phase AC power to convert the AC voltage into a DC voltage, The uninterruptible power supply 20 for an AC load which consists of the storage battery 22 which charges with the DC power converted by the rectifier 21, and the DC / AC inverter 23 which converts DC power into AC power, and supplies it to an AC load side. It will install additionally.

In this case, considering the AC load to be added in the future, the initial installation cost is further increased due to the installation of the uninterruptible power supply and the storage battery having a capacity larger than the required capacity.

In addition, the integration of various communication services may cause unbalanced demand of AC or DC power supply equipment and complicated operation system, such as unnecessary or redundant investment and increase of operating cost.

Therefore, it is necessary to unify or simplify the communication power supply system, and to increase the reliability for high-quality communication services and to prevent duplicate investments that can occur.

Korean Utility Model Registration Publication 20-0193674 (Registration Date: June 13, 2000)

In the present invention, in order to cope with a reduced and added AC load in the communication power supply system, an additional 48V single-phase inverter is installed in an existing 48V DC power supply, so that an economical power supply system can be constructed. It is to provide a parallel uninterruptible power supply system for communication using a single phase F inverter module.

In addition, the present invention is a communication parallel uninterruptible power supply system using a single-phase FFT inverter module configured to form a 48V single-phase inverter as a module, and to respond to the load by increasing the 48V single-phase inverter module in parallel in accordance with the increase of the load capacity. It is about.

In addition, the present invention is to control the synchronization signal of the single-phase inverter module connected in parallel to enable a single-phase output or three-phase output, to supply a parallel uninterruptible power supply for communication using a single-phase FM inverter module that can respond to single-phase or three-phase AC load It is to provide a system.

The present invention is a three-phase AC / DC rectifier for receiving a three-phase power supply to convert into a 48VDC power supply; In the uninterruptible power supply system for communication including a battery for supplying an uninterruptible power supply to the DC load side while charging the battery with a 48VDC power output from the three-phase AC / DC rectifier,

A single-phase inverter module that receives the DC power of the battery and converts it into AC power and outputs it to the AC load side, or receives single-phase AC power from the output side and converts the DC power into DC power to charge the battery;

A bypass path switch unit for directly outputting single-phase AC power to the AC load side and inputting the single-phase AC power to the single-phase inverter module;

Including a main controller and a main display for controlling the single-phase inverter module and the bypass path switch unit, and displays an operation state,

The single phase inverter module,

A bidirectional single phase inverter for converting DC power of the battery into AC power, and converting single-phase AC power input from the output side into DC power;

An inverter controller for switching control of the bidirectional single phase inverter,

A transformer installed between the bidirectional single phase inverter and the bypass path switch unit to boost the output voltage of the bidirectional single phase inverter module, and to reduce the input voltage input from the bypass path switch unit to the bidirectional single phase inverter module. It is characterized in that the modularized to one PCB board.

The single-phase inverter module is installed in a plurality connected in parallel, characterized in that configured to prevent the phase error of the input-output voltage of the parallel-connected single-phase inverter module by controlling the synchronization signal of the plurality of single-phase inverter module connected in parallel in the main controller.

The inverter controller detects information on battery current, battery voltage, inverter output current, load current, and output voltage of the bidirectional single phase inverter, and receives a synchronization signal of a main controller to control switching of the bidirectional single phase inverter. A switching controller, an operation state transmitter for transmitting information on battery current, battery voltage, inverter output current, load current, and output voltage detected by the switching controller to the main controller as operation status information, and from the main controller. A synchronization signal receiving unit receiving the synchronization signal and inputting the synchronization signal as a synchronization signal,

The main controller may include a synchronization signal generator for generating a reference synchronization signal of the single-phase inverter module, an operation state display control unit configured to receive operation state information from the single-phase inverter module and display the operation state of the single-phase inverter module; It characterized in that it comprises a path control unit for controlling the bypass path switch unit by detecting the input terminal voltage of the single-phase AC power.

In the single-phase inverter module, three single-phase inverter modules are connected in parallel, but one output line of each of the two output lines of each single-phase inverter module connected to the load side is an R, S, T phase output line, and the other one output line. It is characterized in that the three-phase AC output is configured to be connected in common by connecting to the common line N.

The bidirectional single phase inverter,

Multiple small-capacity FET elements [(S1; S1_1 to S1_n) and (S2; S2_1 to S2_n)] [(S3; S3_1 to S3) in which switching elements S1 and S3 (S2 and S4) constituting a single-phase propagation bridge are respectively connected in parallel; S3_n), (S4; S4_1 to S4_n)].

According to the present invention, by adding only the 48V single-phase inverter module of the present invention to the existing 48V DC power supply, it is possible to supply AC power to the added AC load, and by installing the single-phase inverter module in parallel, the capacity at low cost when the capacity is expanded It is possible to expand and reduce the installation cost of the battery because it uses the battery installed in the existing 48V DC power supply as it is.

In addition, the present invention by installing a single-phase inverter module in parallel, by connecting the output stage to a three-phase output to configure the three-phase AC output, it is possible to supply the necessary single-phase or three-phase AC power according to the load without additional equipment have.

1 is a configuration diagram of an uninterruptible power supply for additional installation for the AC load additionally added to the conventional 48V DC power supply.
2 is a block diagram of a parallel uninterruptible power supply system for communication using a single-phase FFT inverter module according to the present invention.
3 is a detailed configuration diagram of a parallel uninterruptible power supply system for communication using a single-phase FM inverter module according to the present invention.
4 is a configuration diagram of a single-phase inverter with a parallel configuration of a low capacitance FET device according to the present invention.
5 is a configuration diagram of an inverter controller and a main controller according to the present invention.
Figure 6 is a single-phase output single-phase inverter module parallel connection configuration diagram of a parallel uninterruptible power supply system for communication using a single-phase FFT inverter module according to the present invention.
7 is a three-phase output single-phase inverter module parallel connection configuration diagram of a parallel uninterruptible power supply system for communication using a single-phase F inverter module according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of a parallel uninterruptible power supply system for communication using a single-phase FT inverter module according to the present invention, Figure 3 is a detailed configuration diagram of a parallel uninterruptible power supply system for communication using a single phase FT inverter module according to the present invention. As shown,

The present invention is a three-phase AC / DC rectifier (11) for receiving a three-phase power input and converting it to a 48V DC power supply; In the uninterruptible power supply system for communication including a battery (12) for supplying an uninterruptible power supply to the DC load side while charging with a 48V DC power output from the three-phase AC / DC rectifier 11,

Single-phase inverter module 100 for receiving the DC power of the battery 12 is converted to AC power and output to the AC load side, or receives the single-phase AC power from the output side converted to DC power to charge the battery 12 and ;

A bypass path switch unit 200 for directly outputting single-phase AC power to the AC load side and inputting the single-phase AC power to the single-phase inverter module 100;

Including the main controller 300 and the main display 310 for controlling the single-phase inverter module 100 and the bypass path switch unit 200, and also display the operating state,

The single phase inverter module 100,

A bidirectional single phase inverter 110 for converting and outputting DC power of the battery 12 into AC power or converting single-phase AC power input from the output side into DC power and charging the battery 12 toward the battery 12;

An inverter controller 130 for controlling switching of the bidirectional single-phase inverter 110;

It is installed between the bidirectional single phase inverter 110 and the bypass path switch unit 200 to boost the output voltage of the bidirectional single phase inverter module 100, and from the bypass path switch unit 200 to the bidirectional single phase inverter module ( The input voltage input to 100 is characterized in that it is modularized in one PCB board including a transformer 120 to step down.

4 is a block diagram of a single-phase inverter in a parallel configuration of a low capacitance FET device according to the present invention.

The bidirectional single phase inverter 110,

Multiple small-capacity FET elements [(S1; S1_1 to S1_n) and (S2; S2_1 to S2_n)] [(S3; S3_1 to S3) in which switching elements S1 and S3 (S2 and S4) constituting a single-phase propagation bridge are respectively connected in parallel S3_n), (S4; S4_1 to S4_n)].

As such, when a single-phase inverter is connected by connecting small-capacity FET devices, the conduction loss and heat generation generated by each FET device is about 7 to 8% of that of using a large-capacity IGBT device or by connecting a small-capacity IGBT device in parallel. Even if the heat sink size is small, the FET device can be sufficiently cooled (see Table 1).

Conduction Loss Comparison by Switching Device Type (Same Manufacturer) Item FET application ( 96A x 10 parallel) When applying large IGBT
(240A x 4 parallel) When applying small capacity IGBT
( 96A x 10 parallel) part  persons IRFB4410  AUIRGPS4067D1 IRGP4068DPbF Characteristics  value V _DSS = 100 [V] V _CES = 600 [V] V _CES = 600 [V] I _D = 96 [A] @ 25 [] I _C = 240 [A] @ 25 [] I _C = 96 [A] @ 25 [] V _{DS ( on )} = 0.1 [V] @ 20 [A]
R _{DS ( on )} = 5 [m] @ 20 [A] V _{CE ( on )} = 1.4 [V] @ 50 [A]
R _{CE ( on )} = 28m] @ 50 [A] V _{CE ( on )} = 1.2 [V] @ 20 [A]
R _{CE ( on )} = 60 [m] @ 20 [A] Loss of continuity P _Loss = 20 ² × 0.005 = 2 [W] P _Loss = 50 ² × 0.028 = 70 [W] P _Loss = 20 ² × 0.06 = 24 [W] Parallel connection quantity 10 things 4 10 things Total heat dissipation
(Based on 200 [A]) 20 [W] 280 [W] 240 [W]

As described above, the switching elements of the bidirectional single-phase inverter 110 are implemented using a plurality of small capacity FET devices connected in parallel, respectively, so that the switching devices of the bidirectional single phase inverter 110 can be implemented at very low cost, and the generation of heat generated in the small capacity FET device is large. Compared to the heat dissipation problem, it is easy to solve the heat dissipation problem.

5 is a configuration diagram of an inverter controller and a main controller according to the present invention. As shown in FIG.

The inverter controller 130 includes a battery current I _batt , a battery voltage V _DC , an inverter output current I _inc , a load current I _Load , and an output voltage I _{out of} the bidirectional single phase inverter 110. The switching control unit 131 and the switching control unit 131 for detecting the information on the) and receiving the synchronization signal (Sync) of the main controller 300 to control the switching of the bidirectional single-phase inverter 110. An operation state transmitter 133 for transmitting the detected information about the battery current, the battery voltage, the inverter output current, the load current, and the output voltage to the main controller 300 as operation state information, and from the main controller 300. And a synchronization signal receiver 132 that receives the synchronization signal and inputs the synchronization signal to the switching controller 131 as a synchronization signal.

The main controller 300 receives the operation state information from the synchronization signal generator 302 for generating the reference synchronization signal Sync of the single phase inverter module 100 and the single phase inverter module 100 and receives the single phase inverter module. The operation state display control unit 301 controls to display the operation state of the main display 310, and the path control unit for controlling the bypass path switch unit 200 by detecting the input terminal voltage (Vbps) of the single-phase AC power. Characterized in that it comprises a (303).

Here, the inverter controller 130 is a configuration including a conventional output voltage controller to control the switching control of the switching elements (S1-S4) of the inverter in a pulse width control method, which is a general inverter control technology, so the present invention The detailed description is omitted. When the single-phase inverter module is installed in parallel connection according to the present invention, since the switching control of the modular inverter module cannot be controlled by the main controller, each inverter controller is provided for each module and the inverter module connected in parallel in the main controller. It is characterized in that the addition of the function to receive and display the synchronous control and operation status information.

6 is a configuration diagram of a single phase output single phase inverter module parallel connection of a parallel uninterruptible power supply system for communication using a single phase F inverter module according to the present invention.

A plurality of single-phase inverter module 100 is installed in parallel connected, the main controller 300 to control the synchronization signal of the plurality of single-phase inverter module 100 connected in parallel, the single-phase inverter module 100 is a single phase Characterized in that configured to AC output.

Here, when the single-phase inverter module 100 is connected in parallel for single-phase output, the synchronization signal as a reference is commonly input to the parallel-connected single-phase inverter module to synchronize the synchronization. The synchronization signal refers to a frequency phase synchronization signal of an AC power supply.

7 is a configuration diagram of a three-phase output single-phase inverter module parallel connection of the parallel uninterruptible power supply system for communication using the single-phase FFT inverter module according to the present invention.

The single-phase inverter module 100 is connected to each of the three single-phase inverter module in parallel, one output line of the output line of each of the single-phase inverter module connected to the load side, respectively, R, S, T phase output line, the other one The output lines of are characterized in that the three-phase AC output is configured to connect in common to N common lines.

Here, when three single-phase inverter modules (100- # 1 to 100- # 3) are installed in parallel for three-phase output, one output terminal is connected in common and is output as N common lines. It is configured to draw 3 phase output by drawing output line of each phase for, S, T phase. In this case, since the phase difference of 120 degrees is required for each phase for three-phase output, three single-phase inverter modules 100 are generated by generating three synchronization signals (Sync # 1, Sync # 2, Sync # 3) having a phase difference of 120 degrees. By inputting a synchronous signal to-# 1, 100- # 2, 100- # 3), it is converted into a three-phase AC power source and output.

The uninterruptible power supply system of the present invention configured as described above may be implemented by additionally installing the single-phase inverter module 100 and the bypass path switch unit 200 in the existing 48V DC power supply 10.

The present invention, the single-phase inverter module 100 by installing the bidirectional single-phase inverter 110, the transformer 120 and the inverter controller 130 on one PCB board to modularize, and adds the inverter module according to the AC load capacity This makes it possible to easily cope with capacity expansion.

When receiving the three-phase power input to operate the inverter function, the three-phase power is converted into DC power through the AC / DC rectifier 11 of the existing 48V DC power supply 10 is charged in the battery 12. The power charged in the storage battery 12 is output to the existing DC load side.

At this time, when using the AC load, the 48V single-phase inverter module 100 of the present invention is operated to supply AC power to the AC load side. The 48V single phase inverter module 100 receives the DC power of the battery 12 from the bidirectional single phase inverter 110 and converts the AC power into AC power.

The AC power output from the bidirectional single phase inverter 110 is boosted through the transformer 120 and output to the AC load side through the first path switch SSW1 of the bypass path switch unit 200. That is, the three-phase power is input and charged in the battery 12, the power of the battery 12 is converted to AC power and output to the AC load side.

Therefore, even when an abnormality occurs in the three-phase power source on the input side, the battery 12 is converted into AC power and output to the AC load side, thereby operating as an uninterruptible power supply system.

When the single phase input is used instead of the three phase input, the single phase AC power is output directly to the AC load side through the second path switch SSW2 of the bypass path switch unit 200, and then through the first path switch SSW1. Input to the bi-directional single-phase inverter 110 side is the storage mode of the battery 12 is made together.

Single-phase AC power input through the first path switch (SSW1) of the bypass path switch unit 200 is converted to 48V power through the transformer 120 is lowered, DC power through the bi-directional single-phase inverter 110 Is converted into the battery 12.

At this time, the bidirectional single phase inverter 110 converts AC power to DC power by switching control of the switching elements S1 to S4 having a bridge configuration, and smoothes it through the smoothing capacitor C _dc to charge the storage battery 12. do.

Therefore, when the single-phase AC power supply is normal, when operating with the single-phase power input, the AC load is directly supplied to the AC load side simultaneously with the charging of the battery 12, and when the AC power abnormality occurs at the input terminal, that is, when the power failure occurs, the power supply of the battery 12 Is converted into AC power in the bidirectional single-phase inverter 110 is supplied to the AC load side to perform the function as an uninterruptible power supply system.

In addition, the single-phase inverter module 100 of the present invention may be configured to further include a display 140 for displaying the operating state for each inverter module, which is to directly display the operating state of each of the single-phase inverter module 100.

In addition, the present invention, by connecting the single-phase inverter module 100 in parallel as shown in Figure 5 to operate the system with a single-phase AC output, as shown in Figure 6 is configured to bundle the three single-phase inverter module 100 by three phase output The system can also be operated with a 3-phase AC output. In case of single-phase output operation, basic synchronization signal of main controller is inputted in common, but in case of 3-phase output, R, S, T phase synchronization signals are generated and input to each single-phase inverter module to have phase difference of 120 degrees. By doing so, operation with a three-phase AC output becomes possible.

Therefore, the present invention can provide an uninterruptible power supply system capable of DC output, single-phase AC output, three-phase AC output according to the type of the load, and when the capacity of the AC load increases, only by adding a single-phase inverter module, the capacity is increased. It can cope with it, and it is possible to easily add capacity at low cost.

10: 48V DC Power Supply 11: AC / DC Rectifier
12: storage battery 100: single-phase inverter module
110: bidirectional single phase inverter 120: transformer
130: inverter controller 131: switching control unit
132: synchronization signal receiver 133: operation status transmitter
140: display 200: bypass path switch unit
300: main controller 301: operation status display control unit
302: synchronization signal generator 303: path controller
310: main display

Claims (10)

In the parallel uninterruptible power supply system for communication comprising an uninterruptible DC power supply for converting the input AC power to DC power to charge the battery to output the battery power to the DC load side,
A bidirectional single phase inverter 110 for converting DC power of the battery 12 into AC power and outputting the signal, or converting single-phase AC power input from the output side into DC power and charging the battery 12 toward the battery 12;
An inverter controller 130 for controlling switching of the bidirectional single-phase inverter 110;
A transformer 120 installed at an output terminal of the bidirectional single-phase inverter 110 to perform step-up / step-down conversion of an input / output voltage;
By controlling the inverter controller 130, the display 140 for displaying the operation state of the bidirectional single-phase inverter 110 is modularized on a single PCB board, and installed in addition to the uninterruptible DC power supply to provide uninterruptible AC power supply. Parallel uninterruptible power supply system for communication using a single-phase FT inverter module, characterized in that configured to include.
The method of claim 1, wherein the bidirectional single-phase inverter 110,
Multiple small-capacity FET elements [(S1; S1_1 to S1_n) and (S2; S2_1 to S2_n)] [(S3; S3_1 to S3) in which switching elements S1 and S3 (S2 and S4) constituting a single-phase propagation bridge are respectively connected in parallel; S3_n), (S4; S4_1 ~ S4_n)] parallel uninterruptible power supply system for communication using a single-phase FFT inverter module.
delete A three-phase AC / DC rectifier 11 for receiving a three-phase power and converting the same into a 48V DC power; In a parallel uninterruptible power supply system for communication including a battery (12) for supplying uninterruptible power supply to a DC load side while charging with a 48V DC power output from the three-phase AC / DC rectifier (11),
Single-phase inverter module 100 for receiving the DC power of the battery 12 is converted to AC power and output to the AC load side, or receives the single-phase AC power from the output side converted to DC power to charge the battery 12 and ;
A bypass path switch unit 200 for directly outputting single-phase AC power to the AC load side and inputting the single-phase AC power to the single-phase inverter module 100;
Including the main controller 300 and the main display 310 for controlling the single-phase inverter module 100 and the bypass path switch unit 200, and also display the operating state,
The single phase inverter module 100,
A bidirectional single phase inverter 110 for converting and outputting DC power of the battery 12 into AC power or converting single-phase AC power input from the output side into DC power and charging the battery 12 toward the battery 12;
An inverter controller 130 for controlling switching of the bidirectional single-phase inverter 110;
It is installed between the bidirectional single phase inverter 110 and the bypass path switch unit 200 to boost the output voltage of the bidirectional single phase inverter module 100, and from the bypass path switch unit 200 to the bidirectional single phase inverter module ( 100) The input voltage input to the communication parallel uninterruptible power supply system using a single-phase FT inverter module, characterized in that modularized on a single PCB board including a transformer 120 for stepping down.
The method of claim 4, wherein the bidirectional single phase inverter 110,
Multiple small-capacity FET elements [(S1; S1_1 to S1_n) and (S2; S2_1 to S2_n)] [(S3; S3_1 to S3) in which switching elements S1 and S3 (S2 and S4) constituting a single-phase propagation bridge are respectively connected in parallel; S3_n), (S4; S4_1 ~ S4_n)] parallel uninterruptible power supply system for communication using a single-phase FFT inverter module.
The method of claim 4, wherein the inverter controller 130,
Detecting information about a battery current I _batt , a battery voltage V _DC , an inverter output current I _inc , a load current I _Load , and an output voltage I _{out of} the bidirectional single phase inverter 110; In addition, the switching control unit 131 for receiving the synchronization signal (Sync) of the main controller 300 to control the switching of the bidirectional single-phase inverter 110,
An operation state transmitter 133 which transmits the information on the battery current, the battery voltage, the inverter output current, the load current, and the output voltage detected by the switching controller 131 to the main controller 300 as operation state information; ,
A parallel uninterruptible power supply for communication using a single-phase FT inverter module, characterized in that it comprises a synchronization signal receiving unit 132 for receiving a synchronization signal from the main controller 300 as a synchronization signal to the switching controller 131. system.
The method of claim 4, wherein the main controller 300,
A synchronization signal generator 302 for generating a reference synchronization signal Sync of the single-phase inverter module 100,
An operation state display control unit 301 which receives the operation state information from the single phase inverter module 100 and controls the operation state of the single phase inverter module to be displayed on the main display 310;
Parallel uninterruptible power supply for communication using a single-phase FFT inverter module comprising a path control unit 303 for detecting the input terminal voltage (Vbps) of the single-phase AC power supply to control the bypass path switch unit 200. system.
The single phase inverter module 100 of claim 4, wherein a plurality of single phase inverter modules 100 are installed in parallel and connected to each other, and control the synchronization signals of the plurality of single phase inverter modules 100 connected in parallel in the main controller 300. The parallel uninterruptible power supply system for communication using a single-phase FFT inverter module, characterized in that each of the (100) is configured to perform a single-phase AC output.
According to claim 4, The single-phase inverter module 100, three single-phase inverter modules are connected in parallel, one output line of each of the two output line of the single-phase inverter module connected to the load side R, S, T phase respectively Output line, the other one output line is connected in common to N common line connected to the parallel uninterruptible power supply system for communication using a single-phase FFT inverter module, characterized in that configured.
10. The method of claim 9, wherein when the three single-phase inverter modules (100- # 1 ~ 100- # 3) are installed in parallel for the three-phase output, the main controller 300, three synchronization signals having a phase difference of 120 degrees Single-phase F, characterized by generating (Sync # 1, Sync # 2, Sync # 3) and inputting a synchronization signal to each single-phase inverter module 100- # 1, 100- # 2, 100- # 3. Parallel uninterruptible power supply system for communication using ITI inverter module.

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