KR20010011174A - Uninterrupted Power Supply - Google Patents

Abstract

PURPOSE: An uninterrupted power supply apparatus is provided to continuously supply a power when a thunderbolt falls thereto by absorbing and removing the thunderbolt in itself. CONSTITUTION: An uninterrupted power supply apparatus includes the first rectifying part(100) for converting an alternative current power into a direct current power. A control part(200) is operated by the power from the first rectifying part(100) and controls overall parts of the uninterrupted power supply apparatus. A charging part(300) provides the direct current power to a battery part under the control of the control part(200). The battery part is charged by the direct current power provided from the charging part(300). An inverter(500) converts a direct current from the first rectifying part(100) into an alternative current according to the control of the control part(200). A transformer(600) generates a driving power by inducing the direct current inputted to a primary winding into a secondary winding. A primary absorbing part and a secondary absorbing part(700 and 800) are installed between the inverter and the transformer.

Description

Uninterrupted Power Supply

The present invention relates to an uninterrupted power supply (hereinafter, abbreviated as "UPS"), and more particularly, to an uninterruptible power supply that is capable of supplying power normally without being affected by a high voltage introduced by a lightning strike. will be.

In general, a UPS is a device that supplies stable power without interruption to a load required even in an unstable state such as power failure, instantaneous voltage drop, surge, and overvoltage of commercial power.

Such a UPS can obtain high-quality power only when a stable sine wave is applied to an inverter that converts direct current into alternating current and supplies high-quality power with a constant voltage and constant frequency.

1 is a circuit diagram illustrating an embodiment of a conventional uninterruptible power supply.

In the conventional uninterruptible power supply shown in FIG. 1, an AC / DC converter 10 converts an input AC power into DC power and applies the same to the inverter 20, and the output voltage of the inverter 20 is converted into a transformer 30. Is applied to the downstream load via In this case, the comparator 40 compares the secondary side output voltage of the transformer 30 with a reference voltage, and applies a signal to the controller 50 only when the output voltage is higher than the reference voltage as a result of the voltage comparison. Then, when the signal is applied from the comparator 40, the controller 50 determines that the voltage is higher and operates to supply stable power to the load by increasing or decreasing the driving signal applied to the inverter 20.

However, in the conventional uninterruptible power supply, when there is an error in the input voltage, some stable control can be performed to stabilize the power supplied to the load, but a large amount of output is supplied to the load by lightning. When voltage fluctuation occurred, the transformer and comparator were damaged.

Therefore, the present invention has been proposed to solve various problems occurring in the conventional uninterruptible power supply as described above,

SUMMARY OF THE INVENTION An object of the present invention is to provide an uninterruptible power supply device capable of supplying power normally without being affected even when a high pressure is introduced by a lightning strike.

The present invention (apparatus) for achieving this object,

In the uninterruptible power supply,

A first rectifying unit for full-wave rectifying the input AC power to make the DC power;

A control unit which drives the DC power obtained from the first rectifying unit and controls the overall operation for supplying the uninterruptible power;

A charging unit for supplying the DC power obtained from the first rectifying unit to the charging power under the control of the controller;

A battery unit comprising a plurality of batteries for charging the DC power obtained from the charging unit and supplying the charging power to the device when the input AC power is cut off;

An inverter for inverting the DC power obtained from the first rectifying unit and converting the AC power into AC power under the control of the controller;

A transformer configured to receive the AC power obtained from the inverter to the primary side and guide the primary input power to the secondary side to output the device driving power;

A first high pressure absorbing part interposed between the inverter and the transformer and primarily absorbing the high pressure into the transformer and the inverter due to lightning;

The secondary high pressure absorbing unit is configured to absorb the remaining high pressure that is not absorbed by the primary high pressure absorbing unit to prevent the high pressure introduced from affecting the device.

The uninterruptible power supply device according to the present invention includes a display unit for visually displaying a power supply state of the uninterruptible power supply device, a charge state of a battery, and an operation state of the device under control of the controller, and full-wave rectification of the input AC power. It further comprises a second rectifying unit for supplying made by supplying a plurality of DC power required by the device.

In the above, the inverter is characterized in that inverting the DC power input to the AC power input in a full bridge method or a half bridge method.

In the above, when the inverter is implemented in a full bridge manner, the inverter may include a first switch controller for controlling a switching operation according to a switching control signal output from the controller, and the first rectifying unit under control of the first switch controller. A first switching unit including first and second IGBTs for switching the output DC power; A second switch controller for controlling a switching operation according to a switching control signal output from the controller, and third and fourth IGBTs for switching a DC power output from the first rectifying unit under control of the second switch controller. It is characterized by consisting of a second switching unit.

The primary high pressure absorber may include a choke coil that blocks the transmission of the high pressure to the inverter side when a high pressure is generated on the primary side of the transformer due to a lightning strike, and absorbs and grounds the high pressure introduced to the primary side of the transformer. It is characterized by consisting of a capacitor to.

In addition, the secondary high pressure absorbing unit is characterized in that it is composed of a condenser that absorbs the remaining high pressure that is not absorbed by the primary high pressure absorbing unit.

When the inverter is implemented in the half bridge method, the inverter includes a third switch controller for controlling a switching operation according to a switching control signal output from the controller, and the first rectifying unit under control of the third switch controller. And a third switching unit including fifth and sixth IGBTs for switching the output DC power.

1 is a circuit diagram showing an embodiment of a conventional uninterruptible power supply,

Figure 2 is a block diagram showing an embodiment of an uninterruptible power supply according to the present invention,

3 is a circuit diagram illustrating an example of each part of FIG. 2;

Figure 4 is a circuit diagram showing another embodiment of an uninterruptible power supply according to the present invention.

<Explanation of symbols for main parts of drawing>

100, 1000: first and second rectifier

200: control unit

300: charging unit

500: inverter

600: trance

700, 800: 1st and 2nd high pressure absorption part

Hereinafter, a preferred embodiment of the present invention according to the technical spirit as described above will be described in detail with reference to the accompanying drawings.

Figure 2 shows a block diagram of an uninterruptible power supply according to the present invention.

Here, the reference numeral 100 is a first rectifying unit for full-wave rectifying the input AC power (AC power) to make a DC power, 200 is driven by a DC power (DC power) obtained from the first rectifying unit 100 and supplies an uninterruptible power supply Control unit for controlling the overall operation for, 300 is a charging unit for supplying the DC power obtained from the first rectifying unit 100 to the charging power under the control of the control unit 200, 400 is obtained from the charging unit 300 The battery unit is configured of a plurality of batteries that charge DC power and supply the charging power to the device when the input AC power is cut off.

In addition, the reference numeral 500 is an inverter for converting the DC power obtained by the first rectifying unit 100 to the AC power under the control of the control unit 200, 600 is an AC power obtained from the inverter 500. It is a transformer that inputs to the primary side and induces the primary input power to the secondary side to supply the device driving power.

In addition, the reference numeral 700 is interposed between the inverter 500 and the transformer 600, the first high pressure absorbs the first when the high pressure is introduced into the transformer 600 and the inverter 500 by a lightning strike Absorption unit 800 is a secondary high pressure absorption unit that absorbs the remaining high pressure that is not absorbed by the primary high pressure absorption unit 700 to prevent the incoming high pressure to affect the device.

In addition, the reference numeral 900 is a display unit for visually displaying the power supply state of the uninterruptible power supply, the charge state of the battery and the operation state of the device under the control of the control unit 200, 1000 is full-wave rectification of the input AC power It is a second rectifier that supplies a plurality of DC power supply (24 VDC, 12 VDC, ..., DC 5V) required by the device.

In the uninterruptible power supply according to the present invention configured as described above, the AC power AC input from the first rectifying unit 100 is first rectified by bridge diodes D1 to D4 to generate DC power DC to control the control unit ( 200), the charging unit 300, and supplies to the inverter 500.

The controller 200 performs an initialization operation when the driving power is supplied, and controls the charging of the charging unit 300 when the initialization operation is completed, and generates a switching control signal for the inverting operation of the inverter 500. During the operation of the device, the display unit 900 is controlled to display the operation state and the charging state of each device, and the second rectifier 1000 is also controlled.

Next, the charging unit 300 is composed of a plurality of diodes and gate elements as shown in Figure 3 the plurality of gate elements are controlled according to the charge control signal obtained from the control unit 200, the control of the gate element According to the supply of DC power through a plurality of diodes to the battery unit 400 as a charging power.

Then, the battery unit 400 charges each of a plurality of batteries inside the DC power supplied from the charging unit 300. When the input AC power is cut off, the battery 400 supplies the charged power to the device. give.

Next, the inverter 500 is switched under the control of the control unit 200 to invert the DC power input to the AC power, where the inverter is divided into full bridge method and half bridge method according to the capacity Can be implemented.

Inverter 500 shown in Figure 3 is a configuration of a large capacity (5KW or more) uninterruptible power supply, in this case is provided with a full bridge inverter.

Looking at the configuration, the first switch controller 510 for generating a switching control signal under the control of the control unit 200 and the output from the first rectifying unit 100 under the control of the first switch controller 510 A first switching unit 520 including first and second IGBTs 521 and 522 for switching a DC power source; A second switch controller 530 for controlling a switching operation according to a switching control signal output from the controller 200, and a direct current output from the first rectifying unit 100 under the control of the second switch controller 530. The second switching unit 540 includes a third and fourth IGBTs 541 and 542 for switching a power source.

The inverter 500 configured as described above first turns on the first IGBT 521 of the upper IGBT of the first switching unit 520 by the operation of the first switch controller 510, and then the second IGBT 522 of the lower IGBT. The switching is controlled in such a way that it is turned off.

On the contrary, when the first IGBT 521 that is the upper IGBT of the first switching unit 520 is turned off by the operation of the first switch controller 510, the second IGBT 522 that is the lower IGBT is turned on. Switching is controlled.

Meanwhile, when the third IGBT 541 that is the upper IGBT of the second switching unit 540 is turned off by the operation of the second switch controller 530, the fourth IGBT 542 that is the lower IGBT is turned on. Switching is controlled.

On the contrary, when the third IGBT 541 that is the upper IGBT of the second switching unit 540 is turned on by the operation of the second switch controller 530, the fourth IGBT 542 that is the lower IGBT is turned off. Switching is controlled.

In addition, in order to convert the input DC power into AC power, when the first IGBT 521 of the first switching unit 520 is turned on, the fourth IGBT 542 of the second switching unit 540 is turned on. When the second IGBT 522 of the first switching unit 520 is turned on, the driving of the entire IGBT is turned on in such a manner that the third IGBT 541 of the second switching unit 540 is turned on. Inverted DC power to be controlled is converted to AC power.

Next, the AC power output from the inverter 500 is input to the primary side of the transformer 600, the transformer 600 is supplied with AC power to the primary side and guides it to the secondary side to supply the driving power to the inside of the device. You will.

In addition, the second rectifying unit 1000 rectifies the input AC power by a plurality of rectifying elements under the control of the control unit 200, and then the DC power required by the device (eg, DC24V, DC12V,. ... and so on) and supply it to the device.

In the uninterruptible power supply according to the present invention operating as described above, if a lightning strike or the like occurs, a high pressure is introduced into the primary side of the transformer 600.

Conventionally, there is no function of removing the high pressure introduced in this way has caused a problem that the device is damaged during lightning.

However, in the present invention, when the high pressure is drawn to the primary side of the transformer 600 by lightning, the high pressure absorbed by the primary high pressure absorber 700 to the primary side of the transformer 600 is absorbed and bypassed to the ground. .

Here, the primary high pressure absorbing unit 700, as shown in Figure 3, when the high pressure is generated on the primary side of the transformer 600 by lightning strikes to block the high pressure is transmitted to the inverter 500 side It consists of the choke coil CH1 and the capacitor C3 which absorbs and grounds the high voltage drawn in the primary side of the said transformer 600.

When the high pressure absorbing part 700 configured as described above has the high pressure drawn to the primary side of the transformer 600 by lightning, the choke coil CH1 in the primary high pressure absorbing part 700 has the high pressure introduced by the inverter 500. It is transmitted to the first to block the damage to the inverter 500, the capacitor (C3) is to absorb the high pressure drawn into the primary side of the transformer 600 to bypass the ground.

In this way, even when a high pressure is introduced by a lightning strike, it is possible to stably supply power while preventing the device from being damaged.

If the high pressure introduced by the lightning strike is too high, the primary high pressure absorbing unit 700 may not be able to absorb all of them. In this case, the secondary high pressure absorbing unit 800 may detect the primary high pressure absorbing unit. At 700, the remaining high pressure is not absorbed.

Here, the secondary high pressure absorbing unit 800, as shown in Figure 3, is composed of a capacitor (C1) for absorbing the remaining high pressure that is not absorbed in the primary high pressure absorbing unit 700, the primary When the capacitor C3 in the high pressure absorbing part 700 does not absorb all of the high pressure introduced into the lightning, the remaining high pressure is absorbed by the condenser C1, thereby preventing the device from being damaged by the lightning and making it very stable. It will supply power.

4 is a circuit diagram showing another embodiment of an uninterruptible power supply according to the present invention.

The difference from FIG. 3 is that the uninterruptible power supply of FIG. 4 is a small capacity power supply of 5KW or less, and the inverter 500 is implemented in a half bridge method.

In addition, the second high-pressure absorbing unit 800 is a case where one additional high-pressure absorbing capacitor is added, and the second rectifier 1000, as shown in Figure 3 to make a plurality of DC power supply to the device, as well as additional functions In place of the role of the charging unit 300 of FIG.

In more detail, first, in the charging operation, the AC power input from the second rectifier 1000 is full-wave rectified to make a DC power, and the batteries are supplied to a plurality of batteries in the battery unit 400. Will charge. The other action of the second rectifier 1000 is the same as the operation of the second rectifier 1000 of FIG. 3.

When the inverter 500 is implemented in a half bridge method, the configuration may include a third switch controller 550 for controlling a switching operation according to a switching control signal output from the controller 200, and the third switch controller. The control unit 550 includes fifth and sixth IGBTs 561 and 562 for switching the DC power output from the first rectifying unit 100.

In the half bridge type inverter 500 configured as described above, the third switch controller 550 generates a switching control signal in response to the switching control signal output from the controller 200. The fifth and sixth IGBTs 561 and 562 are controlled.

That is, when the fifth IGBT 561 that is the upper IGBT of the third switching unit 560 is turned on by the operation of the third switch controller 550, the sixth IGBT 562 that is the lower IGBT is turned off. Switching is controlled.

On the contrary, when the fifth IGBT 561 that is the upper IGBT of the third switching unit 560 is turned off by the operation of the third switch controller 550, the sixth IGBT 562 that is the lower IGBT is turned on. Switching is controlled.

Therefore, the upper and lower IGBTs alternately rapidly switch operation to invert the DC power input to the sinusoidal AC power.

Next, the operation of the primary high pressure absorber 700 is the same as the operation of the primary high pressure absorber 700 of FIG. 3, and the secondary high pressure absorber 800 is operated in the primary high pressure absorber 700. The function of absorbing the remaining high pressure that has not been absorbed is the same as the operation of the secondary high pressure absorbing unit 8000 of FIG. 3, but in the configuration, the capacitor is composed of two (C1) and (C2), To absorb the residual high pressure.

That is, the small capacity uninterruptible power supply has a relatively small capacity of the elements constituting the device as compared with a large capacity, and therefore acts very sensitive to high pressure. In other words, the components of the device are weak in hardware compared to large uninterruptible power supplies. Therefore, the device is often broken even at a small high pressure. To solve this problem, the secondary high pressure absorber 800 uses two capacitors C1 and C2 in the primary high pressure absorber 700. Quickly absorbs residual high pressure that could not be absorbed. With this function, it is possible to stably supply power even when high voltage is drawn by lightning.

According to the present invention described above, even when the high pressure is drawn by the lightning strike it can be absorbed and removed, there is an advantage that can provide a stable and continuous power supply even during a lightning strike.

In addition, the inverter is implemented in a full bridge method at a large capacity and a half bridge method at a small capacity, and thus an uninterruptible power supply device can be implemented according to the capacity. Also, an IGBT is used as a device to switch DC power. Therefore, there is an advantage that can supply power even without unstable voltage without damaging the device.

Claims (7)

In the uninterruptible power supply, A first rectifying unit for full-wave rectifying the input AC power to make the DC power; A control unit which drives the DC power obtained from the first rectifying unit and controls the overall operation for supplying the uninterruptible power; A charging unit for supplying the DC power obtained from the first rectifying unit to the charging power under the control of the controller; A battery unit comprising a plurality of batteries for charging the DC power obtained from the charging unit and supplying the charging power to the device when the input AC power is cut off; An inverter which inverts the DC power obtained by the first rectifying unit and converts the AC power into AC power under the control of the controller; A transformer configured to receive the AC power obtained from the inverter to the primary side and guide the primary input power to the secondary side to output the device driving power; A first high pressure absorbing part interposed between the inverter and the transformer and primarily absorbing the high pressure into the transformer and the inverter due to lightning; Uninterruptible power supply, characterized in that it comprises a secondary high pressure absorber to prevent the high pressure introduced by absorbing the residual high pressure that was not absorbed in the primary high pressure absorber. The apparatus of claim 1, further comprising: a display unit for visually displaying the power supply state of the uninterruptible power supply, the charge state of the battery, and the operation state of the device under control of the control unit; An uninterruptible power supply, characterized in that it further comprises a second rectifier for supplying made by a plurality of DC power. The uninterruptible power supply according to claim 1, wherein the inverter inverts DC power input in a full bridge method or a half bridge method into an AC power source. The inverter of claim 1 or 3, wherein the inverter comprises a first switch controller for controlling a switching operation according to a switching control signal output from the controller and the first switch controller. A first switching unit comprising first and second IGBTs for switching DC power output from the first rectifying unit by control; A second switch controller for controlling a switching operation according to a switching control signal output from the controller, and third and fourth IGBTs for switching a DC power output from the first rectifying unit under control of the second switch controller. Uninterruptible power supply, characterized in that the second switching unit. The inverter of claim 1 or 3, wherein the inverter comprises a third switch controller for controlling a switching operation according to a switching control signal output from the controller, and the third switch controller. An uninterruptible power supply comprising: a third switching unit comprising fifth and sixth IGBTs for switching the DC power output from the first rectifying unit by control. The choke coil according to claim 1, wherein the primary high pressure absorbing unit comprises a choke coil that blocks the transmission of the high pressure to the inverter side when a high pressure is generated on the primary side of the transformer due to a lightning strike, and the high pressure introduced to the primary side of the transformer. Uninterruptible power supply, characterized in that consisting of a capacitor to absorb and ground. The uninterruptible power supply of claim 1, wherein the secondary high pressure absorbing unit is configured of a capacitor absorbing the remaining high pressure that is not absorbed by the primary high pressure absorbing unit.