Uninterruptible power supply and method of operating an uninterruptible power supply

Abstract

The uninterruptible power supply may include a battery device; an insertion node configured to be electrically connected to a first main power line by a connection device when the connection device and the uninterruptible power supply are coupled; a power switch for connecting the connection device and the battery device; and a battery management system configured to measure a first voltage of the first main power line through the connection device, turn on the power switch when the measured first voltage is less than a predetermined threshold, measure a second voltage of the insertion node while the power switch is on, and turn off the power switch when the measured second voltage is less than a reference voltage.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims the benefit of priority based on Korean Patent Application No. 10 - 2023 - 0062296 filed on May 15, 2023 and Korean Patent Application No. 10 - 2024 - 0052990 filed on April 19, 2024, and all the contents disclosed in the Korean patent application documents are incorporated herein by reference.

[0002] The present disclosure relates to an uninterruptible power supply device and a method of operating the uninterruptible power supply device.

Background Art

[0003] An uninterruptible power supply (UPS) device must supply power to the power line when the power line experiences a power outage. By the way, the uninterruptible power supply device can operate in the same manner as when the power line has a power outage even when the uninterruptible power supply device is disconnected from the power line. When the uninterruptible power supply device is disconnected from the power line, the uninterruptible power supply device must stop operating, but there is a possibility of a problem in that it recognizes the situation as a power outage and performs a power supply operation.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An uninterruptible power supply device and a method of operating the uninterruptible power supply device that can distinguish between a power outage of the power line and disconnection from the power line are provided.

Means for Solving the Problems

[0005] An uninterruptible power supply (UPS) provided to be electrically connected to a coupling device connected to a first main power line and a second main power line according to one embodiment of the present invention may include a battery device, an insertion node formed to be electrically connected to the first main power line by the coupling device when the coupling device and the UPS are coupled, a power switch for connecting the coupling device and the battery device, and a battery management system that measures a first voltage of the first main power line through the coupling device, turns on the power switch when the measured first voltage is less than a predetermined threshold, measures a second voltage of the insertion node with the power switch on, and turns off the power switch when the measured second voltage is less than a reference voltage.

[0006] The battery management system measures the first voltage at predetermined monitoring intervals, compares the measured first voltage with the threshold, and determines that power is supplied via the first main power line and the second main power line when the measured first voltage is equal to or greater than the threshold, and can control the power switch to the off state.

[0007] The battery management system can turn on the power switch when the first voltage is less than the threshold, measure the second voltage while the power switch is on, turn off the power switch when the measured second voltage is less than the reference voltage, and maintain the power switch in the on state when the measured second voltage is equal to or greater than the reference voltage.

[0008] The battery management system may turn off the power switch when the measured second voltage is less than the reference voltage.

[0009] The battery management system can maintain the power switch in the ON state when the measured second voltage is equal to or greater than the reference voltage.

[0010] The coupling device includes a first coupling terminal connected to the first main power line and a first wiring between the first main power line and the first coupling terminal, and the insertion node may include a second coupling terminal that is electrically connected to the insertion node when the uninterruptible power supply and the coupling device are coupled.

[0011] The battery management system may turn off the power switch when the measured second voltage is less than the reference voltage while the power switch is in the ON state.

[0012] A method for operating an uninterruptible power supply (UPS) provided to be electrically connected to a coupling device connected to a first main power line and a second main power line, according to another embodiment of the present invention, may include the steps of: sensing a power-off state in which no power is supplied to the first and second main power lines; turning on a power switch for connecting the coupling device and the battery device of the UPS when the power-off state is sensed; measuring a first voltage through an insertion node provided to be connected to the first main power line after the power switch has been turned on; determining that the UPS and the coupling device are disconnected when the measured first voltage is less than a predetermined reference value; and turning off the power switch in the determined disconnected state.

[0013] The method of operating the uninterruptible power supply may further include the steps of determining that a power outage is occurring when the measured first voltage is equal to or greater than a predetermined reference value, and maintaining the power switch in the ON state in the determined power outage state.

[0014] The method of operating the uninterruptible power supply may further include the step of turning off the power switch in the determined disconnected state, and then turning off the uninterruptible power supply. [Effects of the Invention]

[0015] This invention provides an uninterruptible power supply (UPS) and a method for operating the UPS that can distinguish between a power line outage and disconnection from a power line. [Brief explanation of the drawing]

[0016] [Figure 1] This figure shows a power system to which an uninterruptible power supply according to one embodiment of the present invention is applied. [Figure 2] This is a block diagram illustrating the uninterruptible power supply and coupling device in standby mode. [Figure 3] This is a block diagram illustrating the uninterruptible power supply and coupling device in power supply mode. [Figure 4] This is a block diagram illustrating the uninterruptible power supply and coupling device in disconnection mode. [Figure 5] This is a flowchart showing the operation of an uninterruptible power supply according to one embodiment. [Figure 6] This block diagram shows multiple uninterruptible power supply units connected to the main power line according to another embodiment. [Figure 7] This block diagram shows the hardware configuration for a battery management device included in an uninterruptible power supply according to one embodiment. [Modes for carrying out the invention]

[0017] Where a specific description of the embodiments disclosed herein would be deemed to obscure the gist of the embodiments disclosed herein, such detailed description will be omitted. Furthermore, the accompanying drawings are merely for the purpose of facilitating the understanding of the embodiments disclosed herein, and the accompanying drawings are not intended to limit the technical idea of ​​the disclosure herein, and should be understood to include any modifications, equivalents, or substitutions that fall within the concept and scope of the invention.

[0018] Terms including ordinal numbers such as "first", "second", etc. may be used to describe various components, but the components are not limited by such terms. Such terms are used only for the purpose of distinguishing one component from another.

[0019] When it is mentioned that a certain component is "connected to" or "coupled to" another component, it should be understood that it can be directly connected or coupled to the other component, but there can also be other components in between. In contrast, when it is mentioned that a certain component is "directly connected to" or "directly coupled to" another component, it should be understood that there are no other components in between.

[0020] In this application, terms such as "comprising" or "having" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and it should not be understood as precluding the presence or addition of one or more other embodiments, numbers, steps, operations, components, parts, or combinations thereof.

[0021] FIG. 1 is a diagram showing a power system to which an uninterruptible power supply device according to an embodiment of the present invention is applied.

[0022] As shown in FIG. 1, two main power lines 11 and 12 are connected between the power grid 10 and the electrical load 20. The power device 30 can filter, switch, or convert the power supplied from the power grid 10 and supply it to the electrical load 20 via the two main power lines 11 and 12.

[0023] The uninterruptible power supply (UPS) 100 may be connected to the two main power lines 11 and 12 via the coupling device 200. The UPS 100 may operate on its own or be charged by the power device 30. In abnormal situations such as a power outage, when power is not supplied to the two main power lines 11 and 12 from the grid 10, power supplied from the UPS 100 may be supplied to the two main power lines 11 and 12. Alternatively, the UPS 100 may be charged by power supplied from the power device 30 via the two main power lines 11 and 12 and the coupling device 200.

[0024] The coupling device 200 can provide a connection between two main power lines 11 and 12 and an uninterruptible power supply (UPS) 100. The coupling device 200 may include wiring and various circuit elements that provide an electrical connection between the two main power lines 11 and 12 and the UPS 100. In Figure 1, the coupling device 200 includes five coupling terminals CT1 to CT5 for connection to an external configuration. The five coupling terminals CT1 to CT5 shown in Figure 1 are examples to illustrate one embodiment, and the present invention is not limited thereto. Coupling terminal CT1 may be connected to the main power line 11 via wiring 31, and coupling terminal CT1 and coupling terminal CT4 may be connected via wiring 211. Coupling terminal CT3 and wiring 211 may be connected via wiring 212. Coupling terminal CT2 may be connected to the main power line 12 via wiring 32. Coupling terminal CT4 may be connected to one end of the power switch 150 of the UPS 100, and coupling terminals CT2 and CT5 may be connected via wiring 213. The connection terminal CT5 may be connected to the negative terminal of the battery device 110 of the uninterruptible power supply 100. The negative terminal of the battery device 110 can mean the negative terminal with the lowest potential among the multiple battery cells that make up the battery device 110. In Figure 1, the connection terminal CT3 is shown to be connected to the wiring 211 via the wiring 212, but the present invention is not limited thereto. For example, the connection terminals CT1 and CT3 may be the same terminal. Alternatively, the connection terminals CT3 and CT1 may be directly connected via the wiring 212. The connection terminal CT3 is a terminal for sensing the connection between the uninterruptible power supply 100 and the main power line 11, and can be implemented in various ways.

[0025] The uninterruptible power supply (UPS) 100 may include an insertion node 121 that contacts the coupling terminal CT3 when coupled to the coupling device 200. One end of the insertion node 121 is connected to the battery management system (BMS) 120 of the UPS 100, and when the UPS 100 is coupled to the coupling device 200, the other end of the insertion node 121 may contact the coupling terminal CT3. This contact can be achieved by physical coupling. This electrically connects the insertion node 121 to the coupling terminal CT3 and may also electrically connect to the main power line 11. When the UPS 100 is disconnected from the coupling device 200, the other end of the insertion node 121 cannot contact the coupling terminal CT3 and may be in a floating state.

[0026] The uninterruptible power supply (UPS) 100 may further include a battery unit 110, a battery management system 120, and a power switch 150. The battery unit 110 may include a plurality of battery cells 111. Figure 1 shows a plurality of battery cells 111 connected in series, but the present invention is not limited thereto. For example, the connection between the plurality of battery cells 111 can be implemented in various ways, such as in series, parallel, or series / parallel. The other end of the power switch 150 may be connected to the positive terminal of the battery cell with the highest potential among the plurality of battery cells 111. For the UPS 100 to supply power, the power switch 150 must be in the ON state.

[0027] The battery management system 120 is connected to the battery device 110 and can monitor the battery device 110, control charging and discharging, and perform protective operations. The battery management system 120 can perform a variety of operations necessary for managing the battery device 110, such as measuring the cell voltage of each of the multiple battery cells 111, measuring the current flowing through the battery device 110, measuring the temperature of the battery device 110, and estimating the state of charge (SOC) and state of health (SOH) of the battery device 110.

[0028] The battery management system 120 can generate a switching signal SWC that controls the switching operation of a power switch 150 connected between the uninterruptible power supply 100 and the coupling device 200. One end of the power switch 150 is connected to the coupling terminal CT4 of the coupling device 200.

[0029] The battery management system 120 can sense the voltage of the main power line 11. To this end, the battery management system 120 can measure the voltage VS1 at one end of the power switch 150, which is electrically connected to the coupling terminal CT4. The battery management system 120 can determine that voltage is being supplied to the coupling device 200 if the voltage VS1 at one end of the power switch 150 is greater than or equal to a predetermined value, and that voltage is not being supplied to the coupling device 200 if it is less than the predetermined value. When voltage is not being supplied to the coupling device 200, the battery management system 120 can turn on the power switch 150 to determine whether the state is a power outage or a disconnection, and sense the voltage of the main power line 11 through the insertion node 121. Alternatively, the battery management system 120 can also measure the voltage VS2 at the other end of the power switch 150. The battery management system 120 can determine that voltage is being supplied to the coupling device 200 if the difference between voltage VS2 and voltage VS1 is greater than or equal to a predetermined value, and that voltage is not being supplied to the coupling device 200 if the difference is less than the predetermined value.

[0030] A power outage state means that the power supply from system 10 is cut off, and a disconnected state means that the uninterruptible power supply (UPS) 100 is disconnected from the coupling device 200. In a power outage state, the UPS 100 is connected to the coupling device 200, but since there is no voltage supplied from the main power line 11 to the coupling device 200, the UPS 100 cannot sense the voltage of the main power line 11 via the coupling device 200. In a disconnected state, the UPS 100 is disconnected from the coupling device 200, so it cannot sense the voltage of the main power line 11 via the coupling device 200. Thus, in both the disconnected state and the power outage state, the UPS 100 cannot sense the voltage of the main power line 11. The UPS 100 needs to determine whether it is in a disconnected state or a power outage state in order to determine its operating mode. In one embodiment, the battery management system 120 measures the voltage of the main power line 11 through the insertion node 121 and can determine whether it is in a power outage state or a disconnected state based on the measured voltage. When the voltage of the main power line 11 is not detected via the coupling device 200, the battery management system 120 turns on the power switch 150, and if the voltage of the main power line 11 is detected through the insertion node 121 during the period when the power switch 150 is on, it can determine that it is in a power outage state. If the voltage of the main power line 11 is not detected through the insertion node 121 during the period when the power switch 150 is on, it can determine that it is in a disconnected state.

[0031] The operating modes of the uninterruptible power supply 100 may include idle mode, power supply mode, and disconnection mode.

[0032] The sleep mode of the uninterruptible power supply (UPS) 100 is the operating mode when the UPS 100 is in a state where it can supply power (hereinafter referred to as "on state") and power is supplied to the electrical load 20 via the grid 10, the power unit 30, and the two main power lines 11 and 12. In sleep mode, the UPS 100 can sense the voltage of at least one of the two main power lines 11 and 12 via the coupling device 200 at predetermined monitoring intervals (e.g., several ms). For example, the battery management system 120 can sense the voltage of the main power line 11 based on the voltage at one end of the power switch 150 (the end connected to the coupling terminal CT4) or the voltage difference across the power switch 150. The main power line 11 is electrically connected to the coupling terminal CT4 via the coupling device 200, and when power is supplied to the electrical load 20 via the grid 10, the power unit 30, and the two main power lines 11 and 12, a voltage may be generated in the main power line 11. In this way, the battery management system 120 can monitor the presence or absence of power supply through the two main power lines 11 and 12 in standby mode and detect power outages or disconnections.

[0033] The power supply mode may be an operating mode in which the uninterruptible power supply 100 supplies power. In the power supply mode, the power switch 150 is in the ON state. When the battery management system 120 detects that power is not being supplied via the two main power lines 11 and 12 in the sleep mode, it can turn on the power switch 150. After the power switch 150 is turned on, the battery management system 120 can determine whether there is a power outage or a disconnection. If the battery management system 120 determines that there is a power outage, the power switch 150 remains in the ON state. With the power switch 150 ON, the coupling device 200 can be powered from the uninterruptible power supply 100 to the load 20 via the two main power lines 11 and 12. Thus, the period during which the uninterruptible power supply 100 operates on power during the ON period of the power switch 150 is called the power supply mode.

[0034] If the battery management system 120 determines that the connection is disconnected, the battery management system 120 can turn off the power switch 150. When the uninterruptible power supply 100 is disconnected from the coupling device 200, the operating mode of the uninterruptible power supply 100 can be called the disconnection mode. In the disconnection mode, the battery management system 120 is turned off, and the uninterruptible power supply 100 may also stop operating, i.e., be turned off.

[0035] Figure 2 is a block diagram illustrating the uninterruptible power supply and coupling device in standby mode.

[0036] As shown in Figure 2, the power switch 150 is in the off state in the sleep mode. The negative terminal of the battery device 110 is connected to the coupling terminal CT5 of the coupling device 200 via the wiring 140, and the insertion node 121 is connected to the coupling terminal CT3 of the coupling device 200. The battery management system 120 can measure the voltage of the main power line 11 via the coupling device 200 at each monitoring cycle. The battery management system 120 measures voltage VS1 or voltages VS1 and VS2, and if the voltage of the main power line 11 is above a predetermined threshold, it determines that it is not in a power outage state or a disconnected state, and can maintain the sleep mode. The battery management system 120 can perform a state identification operation to determine whether it is in a power outage state or a disconnected state if the measured voltage of the main power line 11 is below a predetermined threshold.

[0037] Figure 3 is a block diagram illustrating the uninterruptible power supply and coupling device in power supply mode.

[0038] If the result of the state identification operation is a power outage state, the uninterruptible power supply 100 can operate in power supply mode. In power supply mode, the power switch 150 is in the ON state. The positive terminal of the battery device 110 is electrically connected to the main power line 11, and the negative terminal of the battery device 110 is electrically connected to the main power line 12, and power may be supplied from the battery device 110 to the two main power lines 11 and 12.

[0039] Figure 4 is a block diagram illustrating the uninterruptible power supply and coupling device in disconnection mode.

[0040] If the result of the state identification operation is a disconnected state, the uninterruptible power supply 100 can operate in disconnected mode. In disconnected mode, the battery management system 120 may turn off the power switch 150.

[0041] Figure 5 is a flowchart showing the operation of an uninterruptible power supply according to one embodiment.

[0042] First, in step S310, the battery management system 120 can monitor the voltage of the main power line 11 through the coupling device 200 in the idle mode. In S320, the battery management system 120 can determine whether the monitored voltage is greater than or less than a threshold. If in S320 it is determined that the monitored voltage is greater than the threshold (S320, "yes"), the battery management system 120 returns to S310 and can monitor the voltages of the main power lines 11 and 12 in the idle mode.

[0043] On the other hand, if in S320 the monitored voltage is determined to be less than a threshold (S320, "No"), for example, if the voltage of the main power line 11 is not detected, then in S330 the battery management system 120 may turn on the power switch 150 to distinguish whether it is in a power outage mode or a disconnection mode.

[0044] In S340, the battery management system 120 measures the voltage of the main power line 11 through the insertion node 121, and subsequently, in S350, the battery management system 120 can determine whether the measured voltage is above or below a predetermined reference value.

[0045] If the voltage measured in S350 is determined to be above a predetermined reference value (S350, "Yes"), in S360, the battery management system 120 operates in power outage mode and keeps the power switch 150 continuously ON, supplying power to the main power lines 11 and 12, as described above.

[0046] On the other hand, if the voltage measured in S350 is determined to be less than a predetermined reference value (S350, "No"), in S370, the battery management system 120 operates in disconnection mode and, as described above, can turn off the power switch 150 to interrupt the power supply to the main power lines 11 and 12. In disconnection mode, the uninterruptible power supply 100 may also be turned off along with the battery management system 120.

[0047] On the other hand, in another embodiment, there may be multiple uninterruptible power supplies that can be connected to the two main power lines 11 and 12.

[0048] Figure 6 is a block diagram showing that multiple uninterruptible power supply units according to one embodiment are connected to the main power line.

[0049] Figure 6 shows three uninterruptible power supplies connected to two main power lines 11 and 12, but the present invention is not limited to this.

[0050] The configuration of the three coupling devices 200_1, 200_2, and 200_3 and the three uninterruptible power supplies 100_1, 100_2, and 100_3 may be the same as that of the embodiment shown in Figure 1. In the following description of the embodiment shown in Figure 6, descriptions that are the same as those of the previously described embodiment will be omitted.

[0051] Each of the three uninterruptible power supplies 100_1, 100_2, and 100_3 may include a battery unit 110_1, 110_2, 110_3, a battery management system 110_1, 110_2, 110_3, a power switch 150_1, 150_2, 150_3, and an insertion node 160_1, 160_2, 160_3.

[0052] The coupling device 200_1 may be connected via two main power lines 11 and 12 and two wirings 31_1 and 32_1, the coupling device 200_2 may be connected via two main power lines 11 and 12 and two wirings 31_2 and 32_2, and the coupling device 200_3 may be connected via two main power lines 11 and 12 and two wirings 33_1 and 33_2.

[0053] The battery management systems 120_1, 120_2, and 120_3 of the three uninterruptible power supplies 100_1, 100_2, and 100_3 respectively measure the voltage of the main power line 11 at monitoring intervals while the uninterruptible power supplies 100_1, 100_2, and 100_3 are powered on, and can operate in sleep mode when the measured voltage is above a threshold. Each of the three battery management systems 120_1, 120_2, and 120_3 can perform this monitoring operation individually.

[0054] Based on the monitoring results, when the measured voltage of the main power line 11 is below a threshold, the battery management systems 120_1, 120_2, and 120_3 turn on the power switches 150_1, 150_2, and 150_3, measure the voltage of the main power line 11 through the insertion nodes 160_1, 160_2, and 160_3, and determine that a power outage is occurring if the measured voltage is above the reference voltage, and that a disconnection is occurring if the measured voltage is below the reference voltage. Each of the three battery management systems 120_1, 120_2, and 120_3 can perform this state determination operation individually.

[0055] Each of the three battery management systems, 120_1, 120_2, and 120_3, can operate individually in power supply mode during a power outage and in disconnection mode during a disconnection.

[0056] Figure 7 is a block diagram showing the hardware configuration of a battery management system according to one embodiment.

[0057] A battery management system 120 according to one embodiment disclosed herein may include an MCU 123, a memory 125, and a communication I / F 127. The MCU 123 may be a microcontroller unit (Micro Controller Unit) that executes various programs stored in the memory 125, processes various data used in such programs, and performs the functions of the battery management system 120.

[0058] Memory 125 can store various programs related to the operation of the battery management system 120 and operating data of the battery management system 120 for the operation of the uninterruptible power supply 100. Multiple such memories 125 may be provided as needed. Memory 125 may be volatile memory or non-volatile memory. In the case of volatile memory, memory 125 may be RAM, DRAM, SRAM, etc. In the case of non-volatile memory, memory 125 may be ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of memory 125 given above are merely illustrative and are not limited to these examples.

[0059] The communication interface 127 is configured to send and receive various data with the server, and may be various devices that support wired or wireless communication. For example, programs and various data for the operation of the uninterruptible power supply 100 can be sent and received via wired or wireless connection from an external server separately provided through the communication interface 127.

[0060] Thus, the uninterruptible power supply (UPS) according to this disclosure can distinguish between a power outage state and a disconnected state without adding any additional devices, thereby preventing unnecessary operation. Conventionally, even when the connection is disconnected, the UPS remains ON, which can trigger protective actions to detect abnormal conditions such as a short circuit in the battery device, potentially leading to power consumption due to the operation of the battery management system. The UPS according to this disclosure can prevent safety accidents caused by battery device malfunctions by interrupting such unnecessary operations, and can prevent a decrease in the performance or lifespan of the battery device.

[0061] Although embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto. Various modifications and improvements made by those skilled in the art using the basic concepts of the present invention as defined in the following claims also fall within the scope of the present invention. [Explanation of Symbols]

[0062] 10 strains 11,12 Main power lines 12 Main power lines 20 Electrical load 30 Power equipment 31,32 Wiring 100 Uninterruptible power supply 110 Battery device 111 battery cells 120 Battery Management System 121 Insertion Node 123 Microcontroller Unit (MCU) 125 memory 127 Communication I / F 140 Wiring 150 Power Switch 160 Insertion Nodes

Claims

1. An uninterruptible power supply configured to be electrically connected to a first main power line and a second main power line via a connecting device, Battery device and An insertion node, One end of the insertion node is configured to be electrically connected to the first main power line via the first connection terminal of the coupling device when the coupling device and the uninterruptible power supply are connected, A power switch for connecting the aforementioned coupling device and the aforementioned battery device, One end of the power switch is connected to the battery device. The other end of the power switch is configured to be connected to the first main power line via the second connection terminal of the coupling device when the coupling device and the uninterruptible power supply are connected, and includes a switch. It is a battery management system, The first voltage at the other end of the power switch is measured, When the measured first voltage is less than a predetermined threshold, the power switch is turned on. With the power switch in the ON state, measure the second voltage of the insertion node. A battery management system that turns off the power switch when the measured second voltage is less than the reference voltage, An uninterruptible power supply (UPS).

2. The aforementioned battery management system At predetermined monitoring intervals, the first voltage is measured, and the measured first voltage is compared with the threshold value. If the measured first voltage is equal to or greater than the threshold value, it is determined that power is supplied via the first main power line and the second main power line, and the power switch is controlled to the off state. The uninterruptible power supply according to claim 1.

3. The aforementioned battery management system When the first voltage is less than the threshold, the power switch is turned on, and the second voltage is measured while the power switch is on. When the measured second voltage is less than the reference voltage, the power switch is turned off. When the measured second voltage is equal to or greater than the reference voltage, the power switch is kept on. The uninterruptible power supply according to claim 2.

4. The aforementioned battery management system When the measured second voltage is less than the reference voltage, the power switch is turned off. The uninterruptible power supply according to claim 2.

5. The aforementioned battery management system When the measured second voltage is equal to or greater than the reference voltage, the power switch is kept in the ON state. The uninterruptible power supply according to claim 1.

6. The coupling device is The third connection terminal connected to the first main power line, The first wiring between the first main power line and the third connecting terminal and including, The uninterruptible power supply according to claim 1.

7. The aforementioned battery management system When the power switch is ON and the measured second voltage is less than the reference voltage, the power switch is turned OFF. The uninterruptible power supply according to claim 1.

8. A method for operating an uninterruptible power supply configured to be electrically connected to a first main power line and a second main power line via a coupling device, The aforementioned uninterruptible power supply, Battery device and An insertion node, One end of the insertion node is configured to be electrically connected to the first main power line via the first connection terminal of the coupling device when the coupling device and the uninterruptible power supply are connected, A power switch for connecting the aforementioned coupling device and the aforementioned battery device, One end of the power switch is connected to the battery device. The other end of the power switch is configured to be connected to the first main power line via the second connection terminal of the coupling device when the coupling device and the uninterruptible power supply are connected. Equipped with, The aforementioned operation method, The steps include measuring the first voltage at the other end of the power switch, When the measured first voltage is less than a predetermined threshold, the power switch is turned on. The steps include measuring the second voltage of the insertion node while the power switch is in the ON state, The step of determining that the uninterruptible power supply and the coupling device are disconnected when the measured second voltage is below a predetermined reference value, The steps include turning off the power switch in the disconnected state determined above, The operating method of an uninterruptible power supply, including the method described above.

9. The step of determining that a power outage is occurring when the measured second voltage is above a predetermined reference value, The further step includes maintaining the power switch in the ON state in the power outage condition determined above, The method for operating the uninterruptible power supply according to claim 8.

10. The further step includes turning off the power switch after determining the disconnected state, and then turning off the uninterruptible power supply. The method for operating the uninterruptible power supply according to claim 8.

11. A program for causing a computer to execute an operating method for an uninterruptible power supply configured to be electrically connected to a first main power line and a second main power line via a coupling device, The aforementioned uninterruptible power supply, Battery device and An insertion node, One end of the insertion node is configured to be electrically connected to the first main power line via the first connection terminal of the coupling device when the coupling device and the uninterruptible power supply are connected, A power switch for connecting the aforementioned coupling device and the aforementioned battery device, One end of the power switch is connected to the battery device. The other end of the power switch is configured to be connected to the first main power line via the second connection terminal of the coupling device when the coupling device and the uninterruptible power supply are connected. Equipped with, The operating method of the aforementioned uninterruptible power supply is, The steps include measuring the first voltage at the other end of the power switch, When the measured first voltage is less than a predetermined threshold, the power switch is turned on. The steps include measuring the second voltage of the insertion node while the power switch is in the ON state, The step of determining that the uninterruptible power supply and the coupling device are disconnected when the measured second voltage is below a predetermined reference value, The steps include turning off the power switch in the disconnected state determined above, A computer program that includes [this].

12. The program according to claim 11, wherein the method for operating the uninterruptible power supply further includes the step of turning off the power switch in the determined disconnected state, and then turning off the uninterruptible power supply.

13. The operating method of the aforementioned uninterruptible power supply is, The step of determining that a power outage is occurring when the measured second voltage is above a predetermined reference value, The steps include maintaining the power switch in the ON state in the power outage condition determined above, The program according to claim 11, further comprising:

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