KR20140009914A - Apparatus and method of uninterruptable power supply - Google Patents

Apparatus and method of uninterruptable power supply Download PDF

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Publication number
KR20140009914A
KR20140009914A KR1020130023681A KR20130023681A KR20140009914A KR 20140009914 A KR20140009914 A KR 20140009914A KR 1020130023681 A KR1020130023681 A KR 1020130023681A KR 20130023681 A KR20130023681 A KR 20130023681A KR 20140009914 A KR20140009914 A KR 20140009914A
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KR
South Korea
Prior art keywords
main power
load
power supply
battery
converter
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KR1020130023681A
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Korean (ko)
Inventor
이홍기
정윤이
Original Assignee
우석대학교 산학협력단
정윤이
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Application filed by 우석대학교 산학협력단, 정윤이 filed Critical 우석대학교 산학협력단
Publication of KR20140009914A publication Critical patent/KR20140009914A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

An uninterruptible power supply apparatus is connected between a main power source and a load and supplies energy to the load. The uninterruptible power supply apparatus includes a battery which stores the energy, a bidirectional DC/AC converter which converts DC power into AC power or the AC power into the DC power according to a control signal, a current sensor of a main power source side which senses a current supplied from the main power source, and a management device which senses the normal state of the main power source based on current information transmitted from the current sensor of the main power source side and controls the bidirectional DC/AC converter to supply the energy from the battery to the load if the main power source is abnormal. [Reference numerals] (110) Battery; (170) Management device; (200) Main power; (300) Load

Description

Uninterruptible Power Supply and Method {APPARATUS AND METHOD OF UNINTERRUPTABLE POWER SUPPLY}

The present invention relates to an uninterruptible power supply and method.

An uninterruptable power supply (UPS) is a power supply that keeps your computer running when main power is lost. When the main power supplying power to the load is lost, the UPS transfers energy to the load by switching to a negative battery. The UPS protects the computer from sudden voltage surges.

Referring to FIG. 1, the UPS 10 up to now uses a transfer switch such as a static switch or a high-speed relay to perform a switching function during power failure or power recovery. However, the UPS 10 so far requires a switching time although it is a short time. Since the UPS 10 uses a stationary switch or a high speed relay which are consumables, it is necessary to check periodically. The UPS 10 is expensive because it requires regular replacement of expensive stationary switches or high-speed relays. In addition, since the UPS 10 uses both an AC / DC converter and a DC / AC converter, the converter cost increases.

It is an object of the present invention to provide an uninterruptible power supply and method for supplying energy from a battery to a load during a power failure using a bidirectional DC / AC converter.

An uninterruptible power supply device connected between a main power supply and a load according to an embodiment of the present invention to supply energy to the load, wherein the battery stores energy, converts DC power into AC power or AC power according to a control signal. A bidirectional DC / AC converter converting power into electric power, a main power side current sensor sensing current supplied from the main power source, and detecting whether the main power source is normal based on current information transmitted from the main power side current sensor, And a management device that controls the bidirectional DC / AC converter to supply energy from the battery to the load in an abnormal state.

The uninterruptible power supply may further include a load side current sensor for sensing a current supplied to the load.

The management apparatus calculates load power based on current information transmitted from the load side current sensor when the main power is in a normal state, and supplies the energy from the battery to the load with a predetermined amount of energy less than the load power. DC / AC converters can be controlled.

The management device detects whether the main power is restored to a normal state based on the current information transmitted from the main power side current sensor, and when the main power is restored, the bidirectional DC to reduce energy supplied from the battery to the load. Can control the / AC converter.

The uninterruptible power supply may further include a switch connected to the main power, and the management device may open the switch to cut off the connection between the main power and the bidirectional DC / AC converter when the main power is in an abnormal state.

The management device detects whether the main power is restored to a normal state based on current information transmitted from the main power side current sensor, and when the main power is restored, closes the switch to connect the main power and the bidirectional DC / AC converter. Can be.

The management device monitors the state information of the battery, determines whether the battery is charged based on the state information, and controls the bidirectional DC / AC converter to supply energy from the main power to the battery when charging. can do.

A method of supplying energy to the load by an uninterruptible power supply connected between a main power supply and a load according to another embodiment of the present invention, determining whether the main power is in a normal state based on current information transmitted from a main power supply current sensor. Step, when the main power supply is abnormal, controlling a bidirectional DC / AC converter to supply energy of a first magnitude from a battery to the load, wherein the main power supply is normal based on current information transmitted from the main power supply current sensor. Determining whether the power is restored to a state, and supplying energy of a second size smaller than the first size from the battery to the load by controlling the bidirectional DC / AC converter when the main power is restored.

The supplying the second magnitude of energy from the battery to the load may include calculating a load power based on current information transmitted from a load side current sensor, and controlling the bidirectional DC / AC converter so that the first power is less than the load power. Two magnitudes of energy may be supplied from the battery to the load.

The uninterruptible power supply method may further include supplying energy of the second size from the battery to the load by controlling the bidirectional DC / AC converter when the main power is in a normal state.

The uninterruptible power supply method includes monitoring state information of the battery, determining whether the battery is charged based on the state information, and when charging the battery, supplying energy from the main power source to the battery. The method may further include controlling the bidirectional DC / AC converter.

According to the embodiment of the present invention, when switching power from the main power supply to the sub power supply in case of power failure, do not use a stationary switch or a high speed relay. Therefore, according to the embodiment of the present invention, there is an effect of reducing the transfer time and increasing the reliability. According to the embodiment of the present invention, since no expensive consumables such as a stationary switch are used, maintenance is simple and economical. In addition, according to the embodiment of the present invention, since a bidirectional DC / AC converter is used, the system configuration is simple and inexpensive as compared with the prior art using both the AC / DC converter and the DC / AC converter.

1 is a view for explaining a conventional uninterruptible power supply.
2 is a block diagram of an uninterruptible power supply according to an embodiment of the present invention.
3 is a block diagram of an uninterruptible power supply according to another embodiment of the present invention.
4 is a flowchart illustrating a charging method of an uninterruptible power supply device according to an embodiment of the present invention.
5 is a flowchart of an uninterruptible power supply method according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

An uninterruptible power supply and method according to an embodiment of the present invention will now be described in detail with reference to the drawings.

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

Referring to FIG. 2, the uninterruptible power supply 100 is located between the main power source 200 and the load 300. When the main power source 200 does not normally supply energy to the load 300, the uninterruptible power supply 100 quickly supplies stored energy to the load 300 to maintain normal operation of the load 300. Here, the main power source 200 may be a system power source.

The uninterruptible power supply 100 includes a battery 110, a bidirectional DC / AC converter 130, a main power side current sensor 150, a load side current sensor 160, and a management device 170 for managing them. The uninterruptible power supply 100 may further include a switch 180 to block the connection to the main power side. The switch 180 may be a magnetic switch.

The battery 110 stores energy. The battery 110 charges and discharges energy under the control of the management device 170.

The AC side of the bidirectional DC / AC converter 130 is connected to one point of the energy migration path between the main power source 200 and the load 300. The DC side of the bidirectional DC / AC converter 130 is connected to the battery 110. The bidirectional DC / AC converter 130 converts energy of the main power source 200 and transmits the energy to the battery 110 under the control of the management device 170. The bidirectional DC / AC converter 130 converts energy of the battery 110 and transmits the energy to the load 300 under the control of the management device 170.

The main power supply side current sensor 150 senses a current supplied from the main power supply 200. The main power side current sensor 150 transmits the detected current information to the management device 170.

The load side current sensor 160 senses a current supplied to the load 300. The load side current sensor 160 transmits the detected current information to the management device 170.

The management device 170 monitors battery state information including a state of charge (SOC), a voltage, a temperature, and a discharge current of the battery 110. In addition, the management device 170 detects an overvoltage, an overcurrent, an abnormal temperature, etc. of the battery 110 and takes protective measures of the battery 110. The management device 170 controls the bidirectional DC / AC converter 130 to convert AC power into DC power when the battery 110 is not fully charged or when the capacity of the battery 110 falls below a reference value. Then, energy of the main power source 200 is transferred to the battery 110, and the battery 110 is charged. When the battery 110 is charged, the load 300 receives all necessary power from the main power source 200.

The management device 170 determines whether the main power supply 200 is normal based on the current information transmitted from the main power supply current sensor 150. That is, the management device 170 determines whether the system power supply is outage based on the current information transmitted from the main power supply side current sensor 150.

When the main power source 200 is normal, the management device 170 calculates the load power based on the current information transmitted from the load side current sensor 160. In addition, the management device 170 controls the bidirectional DC / AC converter 130 to output less AC power than the power used by the load in the bidirectional DC / AC converter 130. That is, when the main power source 200 is normal, the load 300 receives most of the energy from the main power source 200, and receives relatively little energy from the battery 110. Through this, when the main power source 200 is normal, no current is sent from the battery 110 to the main power source 200. In this case, the management device 170 may not supply energy from the battery 110 to the load 300.

When the main power source 200 is abnormal, that is, when there is a power failure, the management device 170 controls the bidirectional DC / AC converter 130 to supply all the power required by the load 300 from the battery 110. The bidirectional DC / AC converter 130 is controlled to convert DC power to AC power. Then, energy of the battery 110 is transferred to the load 300. At this time, also, the management apparatus 170 may open the switch 180 is connected to the main power source side, to prevent the energy of the battery 110 from flowing back to the main power supply 200.

The management device 170 determines whether the main power supply 200 has returned from normal to normal, ie, has been restored, based on the current information transmitted from the main power supply current sensor 150. If the power recovery, the management device 170 to reduce the energy to close the switch 180, by controlling the bi-directional DC / AC converter 130 is supplied to the load 300. That is, since the system power is restored, the management device 170 controls the system power to transfer energy to the load 300.

A plurality of uninterruptible power supply devices 100 may be connected to the load 300. In this case, the integrated management apparatus of the plurality of uninterruptible power supply devices 100 may maintain the battery of at least one uninterruptible power supply device 100 in a fully charged state. In this case, the integrated management of the plurality of uninterruptible power supply devices 100 may adjust the charging time of the battery of each uninterruptible power supply device 100.

3 is a block diagram of an uninterruptible power supply according to another embodiment of the present invention.

Referring to FIG. 3, the uninterruptible power supply 100 ′ further includes an AC power stabilizer 190 in the uninterruptible power supply 100.

The AC power stabilization device 190 converts the AC power of the main power source 200 to match the AC power of the load 300. Therefore, the load 300 may always be supplied with good quality power regardless of the change of the main power source 200.

4 is a flowchart illustrating a charging method of an uninterruptible power supply device according to an embodiment of the present invention.

Referring to FIG. 4, the uninterruptible power supply 100 monitors the state of the battery 110 (S110).

The uninterruptible power supply 100 controls the bidirectional DC / AC converter 130 to convert AC power of the main power supply 200 into DC power when charging is required based on the monitoring result (S120). Then, energy of the main power source 200 is transferred to the battery 110, and the battery 110 is charged.

5 is a flowchart of an uninterruptible power supply method according to an embodiment of the present invention.

Referring to FIG. 5, the main power supply side of the uninterruptible power supply 100 is connected to the main power supply 200, and the load side is connected to the load 300 (S210).

The uninterruptible power supply device 100 determines whether the main power supply 200 is in a normal state based on the current information transmitted from the main power supply current sensor 150 (S220).

The uninterruptible power supply 100 outputs AC power having a predetermined size smaller than that used by the load through the bidirectional DC / AC converter 130 to the load 300 (S230). That is, when the main power source 200 is normal, the load 300 receives most of the energy from the main power source 200, and receives relatively little energy from the battery 110. At this time, the uninterruptible power supply 100 calculates load power based on the current information transmitted from the load side current sensor 160.

The main power 200 is an abnormal condition, for example when the power failure, open (open) the switch 180 is connected to the main power supply side (S240).

The uninterruptible power supply 100 supplies all the power required by the load 300 from the battery 110 through the bidirectional DC / AC converter 130 (S250).

The uninterruptible power supply 100 determines whether the main power supply 200 has returned from normal to normal, based on the current information transmitted from the main power supply current sensor 150 (S260).

When the main power supply 200, a power recovery, the uninterruptible power supply (100) closes the switch (180) (S270). The uninterruptible power supply 100 operates as if the main power source 200 is normal.

When the main power source 200 is still in a power failure state, the uninterruptible power supply device 100 supplies all the power required by the load 300 from the battery 110 until the main power source 200 is restored (S280).

As described above, according to the embodiment of the present invention, when switching power from the main power supply to the sub power supply in case of a power failure, a stop switch or a high speed relay is not used. Therefore, according to the embodiment of the present invention, there is an effect of reducing the transfer time and increasing the reliability. According to the embodiment of the present invention, since no expensive consumables such as a stationary switch are used, maintenance is simple and economical. In addition, according to the embodiment of the present invention, since a bidirectional DC / AC converter is used, the system configuration is simple and inexpensive as compared with the prior art using both the AC / DC converter and the DC / AC converter.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (11)

An uninterruptible power supply connected between a main power supply and a load to supply energy to the load,
Batteries where energy is stored,
Bidirectional DC / AC converter to convert DC power to AC power or AC power to DC power according to the control signal,
A main power supply side current sensor for sensing a current supplied from the main power supply, and
Management to detect whether the main power is normal based on the current information transmitted from the main power side current sensor, and to control the bidirectional DC / AC converter to supply energy from the battery to the load when the main power is abnormal Device
Uninterruptible power supply comprising a. In claim 1,
Uninterruptible power supply further comprises a load-side current sensor for sensing the current supplied to the load. 3. The method of claim 2,
The management device
When the main power source is in a normal state, the load power is calculated based on the current information transmitted from the load side current sensor, and the bidirectional DC / AC converter is configured to supply a predetermined amount of energy less than the load power from the battery to the load. Uninterruptible power supply to control the. In claim 1,
The management device
The bidirectional DC / AC converter is configured to detect whether the main power is restored to a normal state based on the current information transmitted from the main power side current sensor, and to reduce energy supplied from the battery to the load when the main power is restored. Uninterruptible power supply to control. In claim 1,
Further comprising a switch connected to the main power source,
The management device
And an uninterruptible power supply for opening the switch to cut off the connection between the main power and the bidirectional DC / AC converter when the main power is abnormal. The method of claim 5,
The management device
An uninterruptible power supply for detecting whether the main power is restored to a normal state based on the current information transmitted from the main power supply current sensor, and if the main power is restored, by closing the switch to connect the main power and the bidirectional DC / AC converter. Device. The method of claim 5,
The management device
Uninterruptible power supply that monitors the status information of the battery, determines whether the battery is charged based on the status information, and controls the bidirectional DC / AC converter to supply energy from the main power to the battery when charging. Device. A method of supplying energy to a load by an uninterruptible power supply connected between a main power supply and a load,
Determining whether the main power is in a normal state based on current information transmitted from the main power side current sensor;
Supplying energy of a first magnitude from a battery to the load by controlling a bidirectional DC / AC converter when the main power is abnormal;
Determining whether the main power is restored to a normal state based on current information transmitted from the main power supply current sensor, and
When the main power is restored, controlling the bidirectional DC / AC converter to supply energy of a second magnitude less than the first magnitude from the battery to the load
Uninterruptible power supply method comprising a. 9. The method of claim 8,
Supplying the second amount of energy from the battery to the load
An uninterruptible power supply method for calculating load power based on current information transmitted from a load-side current sensor, and controlling the bidirectional DC / AC converter to supply energy of the second magnitude less than the load power from the battery to the load. . 9. The method of claim 8,
Controlling the bidirectional DC / AC converter to supply energy of the second magnitude from the battery to the load when the main power is in a normal state
Uninterruptible power supply method comprising more. 9. The method of claim 8,
Monitoring status information of the battery;
Determining whether the battery is charged based on the state information, and
When charging the battery, controlling the bidirectional DC / AC converter to supply energy from the main power source to the battery
Uninterruptible power supply method comprising more.
KR1020130023681A 2012-07-13 2013-03-06 Apparatus and method of uninterruptable power supply KR20140009914A (en)

Applications Claiming Priority (2)

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KR20120076787 2012-07-13
KR1020120076787 2012-07-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160007740A (en) * 2014-06-26 2016-01-21 에스케이이노베이션 주식회사 Dual power supply for energy storage system and method for controlling the same
US10868477B2 (en) 2016-12-09 2020-12-15 Samsung Sdi Co., Ltd. Power conversion apparatus and uninterruptible power supply comprising same
KR102510108B1 (en) * 2022-11-04 2023-03-14 주식회사 이온 Uninterruptible power supply
KR102614594B1 (en) * 2022-07-07 2023-12-15 한영전기기술 주식회사 System for controlling bidirectional converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160007740A (en) * 2014-06-26 2016-01-21 에스케이이노베이션 주식회사 Dual power supply for energy storage system and method for controlling the same
US10868477B2 (en) 2016-12-09 2020-12-15 Samsung Sdi Co., Ltd. Power conversion apparatus and uninterruptible power supply comprising same
KR102614594B1 (en) * 2022-07-07 2023-12-15 한영전기기술 주식회사 System for controlling bidirectional converter
KR102510108B1 (en) * 2022-11-04 2023-03-14 주식회사 이온 Uninterruptible power supply

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