KR20160001972A

KR20160001972A - Uninterruptible power supply

Info

Publication number: KR20160001972A
Application number: KR1020140080569A
Authority: KR
Inventors: 박경선
Original assignee: 박경선
Priority date: 2014-06-30
Filing date: 2014-06-30
Publication date: 2016-01-07

Abstract

In the present invention, when the UPS is performing the offline uninterruptible operation mode or performing the online uninterruptible eco operation mode, the power is supplied to the load through the idle bit, and when the power failure occurs, the backup power is supplied through the S- It is solved that the power source can not be supplied with a stable power to the load shut down, thereby enabling normal non-fast switching. In addition, the uninterruptible power supply can be implemented at a lower cost, and power can be supplied to the load through the ESC in the initial state of driving to prevent the idle bit from being damaged by the peak current.

Description

{UNINTERRUPTIBLE POWER SUPPLY}

The present invention relates to an uninterruptible power supply apparatus, and more particularly, to an uninterruptible power supply apparatus capable of preventing a short current from flowing in an off-line uninterruptible operation mode or an on-line uninterruptible eco operation mode of an off-line uninterruptible power supply apparatus.

Generally, an uninterruptible power supply (UPS) automatically and stably adjusts the voltage and frequency in the presence of power supply voltage or frequency fluctuations, and continuously supplies the power to the load in the event of a power failure. Lt; / RTI >

In recent years, demand for uninterruptible power supplies has been increasing due to the need for reliable system operation in financial, broadcasting, and industrial fields.

1 is a block diagram of a conventional uninterruptible power supply. As shown in FIG. 1, the uninterruptible power supply 100 includes a first ESR unit 110A, an AC / DC converter 120, a backup battery 130, an inverter 140 , A second S / S part (110B), and a load (150).

The first escal unit 110A is connected between the grid terminal GRID and the load 140. The first escal unit 110A is connected between the grid terminal GRID and the load 140. In the off-line uninterruptible operation mode or the online uninterruptible eco operation mode of the offline uninterruptible power supply unit, The load 150 is supplied with power. At this time, the control unit (not shown in the drawing) controls the operation of the SCR provided in the first ESR unit 110A so that the voltage (power) required by the load 150 is supplied. At this time, the AC / DC converter 120 converts the commercial power (AC) supplied through the grid terminal (GRID) to DC and outputs it.

The backup battery 130 charges the DC power supplied from the AC / DC converter 120.

On the other hand, since power is not supplied through the grid terminal (GRID) when a power failure occurs, power can not be supplied to the load (150) through the first ESC part (110A).

However, the direct current power stored in the backup battery 130 is converted into direct current power through the inverter 140, and the direct current power thus converted is supplied to the load 150 through the second escalator part 110B.

Therefore, even when a power failure occurs, it is possible to continuously supply power to the load 150. [

However, in the power failure mode, a short current may flow through the first ESR part 110A, thereby causing the inverter 140 to shut down.

In this way, the conventional uninterruptible power supply unit can flow a short current through the S / S unit due to the electrical characteristics of the ESC in the off-line uninterruptible operation mode or the online uninterruptible eco operation mode, thereby shutting down the inverter and providing a stable power supply to the load There is a problem. In other words, there is a problem that normal non-fast switching is not possible.

A problem to be solved by the present invention is to supply power to a load through an IGBT (Insulated Gate Bipolar Mode Transistor) in an off-line uninterruptible operation mode or an on-line uninterruptible eco operation mode of an off-line uninterruptible power supply, And the backup power is supplied to the load to enable the non-fast switching.

According to an aspect of the present invention, there is provided an uninterruptible power supply comprising: a first ESC unit for supplying power to a load in an off-line uninterruptible operation mode or an on-line uninterruptible eco operation mode; An idle bit for supplying power to the load after an initial driving state has elapsed; A bidirectional power converter for rectifying an AC power supplied through a grid terminal in a normal driving state to charge a backup battery or converting a DC power supplied from the backup battery into an AC power and outputting the AC power to the grid terminal; An inverter for converting AC power supplied from the backup battery into AC power when a power failure occurs; A second escalator for supplying power from the inverter to the load when a power failure occurs; And a control unit for outputting gate control signals to the first, second and third idle units, and controlling the driving of the first, second and third idle units, and the idle unit, .

In the present invention, when the uninterruptible power supply unit performs the off-line uninterruptible operation mode, performs the on-line uninterruptible eco operation mode, or supplies power to the load through the idle bit on normal operation, The inverter is shut down and the stable power supply can not be supplied to the load. Thus, there is an effect that normal non-fast switching can be performed.

In addition, by supplying power to the load through the idle bit, the uninterruptible power supply can be implemented at a lower cost.

In addition, in the initial state of driving, power is supplied to the load through the ESC, so that there is an effect that the idle bit can be prevented from being damaged by the peak current.

1 is a block diagram of a conventional uninterruptible power supply.
2 is a block diagram of an uninterruptible power supply according to an embodiment of the present invention.

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

FIG. 2 is a block diagram of an uninterruptible power supply according to an embodiment of the present invention. As shown in FIG. 2, the uninterruptible power supply 200 includes a first ESR unit 210A, an eye bit unit 220, A second backup unit 230, a backup battery 240, an inverter 250, a second expansion unit 210B, a load 260, and a control unit 270.

A first escull part 210A is connected between the grid terminal GRID and the first node N1. The first ESR part 210A includes ESRs SCR1 and SCR2 connected in opposite directions. The idle bit portion 220 is connected between the grid terminal GRID and the first node N1. The IGBT 220 is connected in series with the IGBT 1 and IGBT 2 and the IGBT 1 is connected in parallel with the internal diode D 1 and the IGBT 2 is connected to the internal diode D 2 ). A bidirectional power converter 230 is connected between the grid terminal GRID and the first node N1. And the second node N2 and the backup battery 240 are connected. An inverter 250 is connected between the second node N2 and the third node N3. A second escold part 210B is connected between the third node N3 and the first node N1. The second male threaded portion 210B includes SCR3 and SCR4 connected to each other in opposite directions. A load 260 is connected to the first node N1. The gate terminals of SCR1 and SCR2 provided in the first ESR part 210A and the gate terminals of SCR3 and SCR3 provided in the second ESR part 210B G4 and G5 of the IGBTs IGBT1 and IGBT2 included in the idle biter 220 are connected to the control signal output terminal of the controller 270. [

When the uninterruptible power supply 200 performs the offline uninterruptible operation mode or performs the online uninterruptible eco operation mode, the controller 270 sets the gate control signals CTL_1 and CTL_2 for a predetermined time (for example, 1 second) SCR1 and SCR2 of the first SCR part 210A to the gates G1 and G2 of the SCR1 and SCR2 respectively to control operations of the SCR1 and SCR2, (SCR1) and (SCR2), respectively. Accordingly, power is supplied to the load 260 through the SCR1 and SCR2 of the first ESR part 210A.

The reason for supplying power to the load 260 through the first ESR part 210A in the initial state of driving as described above is that the durability of the ESRs SCR1 and SCR2 is lower than the durability of the IGBTs IGBT1 and IGBT2 The IGBT 1 and IGBT 2 of the idle bit portion 220 are prevented from being destroyed by the peak current in the initial driving state.

The control unit 270 outputs the gate control signals CTL_5 and CTL_6 to the IGBT1 of the idle bit unit 220 and the gates G5 and G6 of the IGBT2, (IGBT1) and (IGBT2), respectively. Accordingly, power is supplied to the load 260 via the IGBT 1 and IGBT 2 of the idle bit unit 220.

At this time, the bidirectional power converter 230 converts the commercial power (AC) supplied through the grid terminal (GRID) to DC and outputs it. Therefore, the backup battery 240 can charge the DC power supplied from the bi-directional power converter 230.

Conversely, the bidirectional power converter 230 may convert the DC power supplied from the backup battery 240 to AC power and output the AC power to the grid terminal GRID.

As described above, the bidirectional power converter 230 functions as an AC / DC converter for converting AC power to DC power, and also functions as an AC / DC converter for converting DC power to AC power.

On the other hand, when a power failure occurs in the UPS 200 at an arbitrary point in time, the controller 270 recognizes that a power failure has occurred through the electrostatic sensor, and then outputs the gate control signals CTL_5 and CTL_6 The driving of the ignition unit 220 is stopped. At the same time, the control unit 270 outputs the gate control signals CTL_3 and CTL_3 to the gates G3 and G4 of the SCR3 and SCR4 of the second MSR unit 210B The operations of the SCRs SCR1 and SCR2 are controlled and the SCRs SCR3 and SCR4 are driven.

Accordingly, after the power charged in the backup battery 240 is converted into AC power through the inverter 250, the power is supplied to the loads 260 (260) through the SCR 3 and SCR 4 of the second ESR 210B .

Therefore, since the inverter 250 is surely prevented from being shut down when a power failure occurs, the backup power supply can be stably supplied to the load 260.

Although the preferred embodiments of the present invention have been described in detail above, it should be understood that the scope of the present invention is not limited thereto. These embodiments are also within the scope of the present invention.

200: Uninterruptible power supply unit 210A:
210B: second escull part 220: azibitibu
230: Bi-directional power converter 240: Backup battery
250: Inverter 260: Load
270:

Claims

A first escal unit for supplying power to the load in an initial driving state;
An idle bit for supplying power to the load after an initial driving state has elapsed;
A bidirectional power converter for rectifying an AC power supplied through a grid terminal in a normal driving state to charge a backup battery or converting a DC power supplied from the backup battery into an AC power and outputting the AC power to the grid terminal;
An inverter for converting AC power supplied from the backup battery into AC power when a power failure occurs;
A second escalator for supplying power from the inverter to the load when a power failure occurs; And a control unit for outputting gate control signals to the first, second and third idle units, and controlling the driving of the first, second and third idle units, and the idle unit, Wherein the uninterruptible power supply unit includes an uninterruptible power supply.

The method according to claim 1,
Wherein the time of the driving initial state is a preset time on the control unit.

The method according to claim 1,
Wherein the first ESC part comprises a first ESC and a second ESC that are connected in parallel between the grid terminal and the input terminal of the load in opposite directions to each other.

The method according to claim 1,
Wherein the idle bit unit includes a first idioti and a second idioti connected in series between the grid terminal and the input terminal of the load.

5. The method of claim 4,
Wherein the first idiotti is connected in parallel with the first diode and the second idioti is connected in parallel with the second diode.

The method according to claim 1,
Wherein the second ESC part includes a third ESC and a fourth ESC that are connected in series between the output terminal of the inverter and the input terminal of the load in a reverse direction.