Uninterruptible power supply device

Abstract

To provide an uninterruptible power supply that can suppress complication of device configuration even in the case where conduction of a bypass circuit unit is switched by using an interruption unit which requires a signal for closing a main contact point and a signal for opening the main contact point.SOLUTION: An uninterruptible power supply 100 comprises: a power conversion unit 30 including a converter unit 31, a battery 32 (a power storage unit) and an inverter unit 34; a bypass circuit unit 1 that is connected to the power conversion unit 30 in parallel; and an interruption unit 10 including a contact point 11 that switches conduction of the bypass circuit unit 1, a feeding unit 13 that makes the contact point 11 operate so as to be closed, and a leading-out unit 14 that makes the contact point 11 operate so as to be opened. The leading-out unit 14 is configured to make the contact point 11 operate to be opened on the basis of a bypass voltage that is an input voltage of an AC power from an AC power supply 101 to the bypass circuit part 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an uninterruptible power supply device, and more particularly to an uninterruptible power supply device including a bypass circuit section that supplies AC power from an AC power source to a load.

Background Art

[0002] Conventionally, an uninterruptible power supply device including a bypass circuit (bypass circuit section) that supplies AC power from an AC power source to a load has been known (see, for example, Patent Document 1).

[0003] The uninterruptible power supply device described in Patent Document 1 includes an uninterruptible power supply module and a bypass circuit. The uninterruptible power supply module has a converter, a battery, and an inverter. The converter converts AC power supplied from an AC power source into DC power. The battery stores DC power. The inverter converts DC power from the converter or the battery into AC power and supplies it to the load. Further, the bypass circuit is provided to supply AC power from the AC power source to the load without passing through the inverter. The bypass circuit is provided with a non-breakover switch that instantaneously switches conduction and a switch connected in series on the AC power source side of the non-breakover switch. In the uninterruptible power supply device described in Patent Document 1, when both the non-breakover switch of the bypass circuit and the switch connected in series to the non-breakover switch are turned on, AC power from the AC power source is supplied to the load via the bypass circuit.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, although not specified in Patent Document 1 above, generally, an electromagnetic contactor is used as the switch provided in the bypass circuit (bypass circuit section). However, since the rated current (the current that can be energized) of the electromagnetic contactor is generally relatively small, it is difficult to use an electromagnetic contactor to switch the conduction of the bypass circuit section of a large-capacity uninterruptible power supply device. Therefore, in a large-capacity uninterruptible power supply device, a circuit breaker such as a molded case circuit breaker (MCCB) or an air circuit breaker (ACB) with a rated current larger than that of the electromagnetic contactor needs to be used as the switch for switching the conduction of the bypass circuit section.

[0006] However, generally, different from an electromagnetic contactor, a circuit breaker such as a molded case circuit breaker or an air circuit breaker requires a signal for closing (energizing) the main contact and a signal for opening (removing) the main contact in order to open and close the conduction. Therefore, when using a circuit breaker such as a molded case circuit breaker or an air circuit breaker to switch the conduction of the bypass circuit section, compared with the case of using an electromagnetic contactor, there is a problem that the drive circuit becomes complicated and the device configuration becomes complicated in order to generate both a signal for closing (turning ON) the main contact and a signal for opening (turning OFF) the main contact.

[0007] The present invention has been made to solve the above problems, and one object of the present invention is to provide an uninterruptible power supply device capable of suppressing the complication of the device configuration even when switching the conduction of the bypass circuit section using a cutoff section that requires a signal for closing the main contact and a signal for opening the main contact.

Means for Solving the Problems

[0008] To achieve the above object, an uninterruptible power supply device according to one aspect of the present invention includes a converter unit that converts AC power from an AC power source into DC power, a power storage unit that outputs DC power, and an inverter unit that converts the DC power from the converter unit and the power storage unit into AC power and supplies the converted AC power to a load. A power conversion unit, a bypass circuit unit that is connected in parallel with the power conversion unit between the AC power source and the load and supplies AC power from the AC power source to the load, a main contact that opens and closes the conduction of the bypass circuit unit, and a main contact is Operates based on a first closing signal an insertion unit, Operates based on a second signal that opens a main contact different from the first signal a removal unit, and a cutoff unit including the removal unit, and a first The first signal and the second signal are independently generated based on a common bypass voltage, which is the input voltage of AC power from an AC power source to a bypass circuit section, and are respectively input to an insertion unit and a removal unit of the cutoff section 。

[0009] In the uninterruptible power supply device according to the above aspect, as described above, it includes a cutoff unit including an insertion unit that operates to close the main contact and a removal unit that operates to open the main contact. And the removal unit is configured to operate to open the main contact based on the bypass voltage which is the input voltage of the AC power from the AC power source to the bypass circuit unit. Thereby, when opening and closing the conduction of the bypass circuit unit by the cutoff unit including the insertion unit for closing the main contact and the removal unit for opening the main contact, without providing a drive circuit for generating a signal for closing the main contact and a signal for opening the main contact, the main contact of the cutoff unit can be opened based on the input bypass voltage. For this reason, it is possible to suppress the complication of the device configuration for opening and closing the conduction of the bypass circuit unit (switching between ON and OFF). As a result, even when switching the conduction of the bypass circuit unit using a cutoff unit that requires a signal for closing the main contact and a signal for opening the main contact, it is possible to suppress the complication of the device configuration.

[0010] In the uninterruptible power supply device according to the above-described one aspect, preferably, it includes a power conversion unit and further includes a plurality of power conversion modules connected in parallel to each other. The bypass circuit unit is connected in parallel between the AC power supply and the load and is commonly used for the plurality of power conversion modules. The main contact of the cutoff unit is configured to open and close the conduction of the bypass circuit unit connected in parallel with the plurality of power conversion modules. With this configuration, even when configured to be able to output a relatively large capacity by including a plurality of power conversion modules connected in parallel to each other, the main contact of the cutoff unit can be opened based on the input bypass voltage. Therefore, it is possible to effectively suppress the complication of the device configuration for opening and closing (switching between ON and OFF) the conduction of the bypass circuit unit commonly used for the plurality of power conversion modules.

[0011] In the uninterruptible power supply device according to the above-described one aspect, preferably, it further includes a control unit that controls the conduction of the bypass circuit unit by the cutoff unit, and an input switch unit that is connected in series with the input unit of the cutoff unit and switches the conduction based on an operation signal from the control unit. The input unit is configured to operate to close the main contact of the cutoff unit based on the bypass voltage applied through the input switch unit in a state where the input switch unit is closed based on the operation signal. With this configuration, based on the operation signal from the control unit, by applying the bypass voltage to the input unit, it is possible to operate to close the main contact of the cutoff unit. Therefore, by controlling the operation signal from the control unit, the bypass circuit unit can be easily made conductive (turned ON). As a result, while suppressing the complication of the device configuration, the bypass circuit unit can be easily made conductive using the cutoff unit.

[0012] In the uninterruptible power supply device according to the above-described one aspect, preferably, the removal unit is configured to operate so as to open the main contact when the bypass voltage applied is less than a predetermined threshold value. With this configuration, by applying a bypass voltage to the removal unit, the bypass circuit unit can be easily interrupted (turned off) without providing a configuration for generating a signal for opening (removing) the main contact. Therefore, the bypass circuit unit can be easily interrupted when the bypass voltage is less than the predetermined threshold value without complicating the device configuration. As a result, even when the conduction of the bypass circuit unit is opened and closed using the cutoff unit including the insertion unit and the removal unit, the bypass circuit unit can be more easily interrupted while suppressing the complication of the device configuration.

[0013] In this case, preferably, it includes a switching element and further includes a semiconductor switch unit that switches the conduction of the bypass circuit unit separately from the cutoff unit, and the cutoff unit is connected in series with the semiconductor switch unit on the AC power supply side of the semiconductor switch unit in the bypass circuit unit. With this configuration, in the bypass circuit unit, since the semiconductor switch unit and the cutoff unit are connected in series, the output of the AC power by the power conversion unit and the output of the AC power from the bypass circuit unit can be switched by the semiconductor switch unit, and the conduction of the cutoff unit can be easily switched based on the bypass voltage. Therefore, the bypass circuit unit can be easily interrupted by the cutoff unit while switching the output of the AC power by the semiconductor switch unit having better responsiveness than the cutoff unit.

[0014] In the uninterruptible power supply device according to the above-described one aspect, preferably, a disconnecting switch unit is further provided which is connected in series with the removal unit of the disconnecting part and switches conduction based on an operation signal from the control unit. The removal unit is configured to operate so as to open the main contact of the disconnecting part based on a bypass voltage applied through the disconnecting switch unit when the disconnecting switch unit closes based on the operation signal. With this configuration, even when there is no change in the bypass voltage, the main contact of the disconnecting part can be opened (disconnected) by the removal unit by switching the conduction of the disconnecting switch unit. Therefore, even when the bypass voltage is normal, the bypass circuit part can be disconnected using the disconnecting part including the input unit and the removal unit. As a result, even when the bypass voltage is normal, it is possible to suppress the complication of the device configuration for switching the conduction of the bypass circuit part.

[0015] In the uninterruptible power supply device according to the above-described one aspect, preferably, the disconnecting part has an auxiliary contact that operates in conjunction with the main contact separately from the main contact. The auxiliary contact is connected in series with the input unit and is configured to cut off conduction to the input unit after the closing operation of the main contact in conjunction with the closing operation of the main contact. Here, the disconnecting part including the input unit and the removal unit needs to cut off the input of a signal to the input unit after operating the input unit to close the main contact. In contrast, in the present invention, the auxiliary contact is connected in series with the input unit and is configured to cut off conduction to the input unit after the closing operation of the main contact in conjunction with the closing operation of the main contact. With this configuration, after operating the input unit to close the main contact, the input of a signal to the input unit can be easily cut off by using the auxiliary contact provided in the disconnecting part. As a result, the input of a signal to the input unit can be easily cut off by using the auxiliary contact provided in the disconnecting part.

[0016] In the uninterruptible power supply device according to the above-described one aspect, preferably, the cutoff unit further includes a monitoring unit that monitors the input to the input unit. The monitoring unit is connected in series with the input unit and is configured to cut off the conduction to the input unit after the closing operation of the main contact when detecting an input for operating the input unit. With this configuration, even when the auxiliary contact is not configured to operate after the main contact, by using the monitoring unit, it is possible to cut off the conduction to the input unit after the closing operation of the main contact. Therefore, by using the monitoring unit, it is possible to easily cut off the input of the signal to the input unit even when the auxiliary contact cannot be used.

[0017] In the uninterruptible power supply device according to the above-described one aspect, preferably, the cutoff unit further includes a winding-up unit configured to energize an input spring for performing the closing operation of the main contact based on the bypass voltage. With this configuration, it is possible to energize the input spring based on the bypass voltage. Therefore, it is possible to easily energize the input spring using the bypass voltage without newly providing a configuration for generating a signal for energizing the input spring.

Advantages of the Invention

[0018] According to the present invention, as described above, even when switching the conduction of the bypass circuit unit using a cutoff unit that requires a signal for closing the main contact and a signal for opening the main contact, it is possible to provide an uninterruptible power supply device capable of suppressing the complication of the device configuration.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[0021] [First Embodiment] With reference to FIGS. 1 to 4, the overall configuration of the uninterruptible power supply device (UPS: Uninterruptible Power Supply) 100 according to the first embodiment of the present invention will be described.

[0022] (Overall Configuration of Uninterruptible Power Supply Device) As shown in FIG. 1, the uninterruptible power supply device 100 includes a bypass circuit section 1, power conversion modules 2, 3, 4, and 5, and a control section 6. In the first embodiment, the power conversion modules 2 to 5 are connected in parallel with each other. And the bypass circuit section 1 is connected in parallel with the plurality of power conversion modules 2 to 5 between the AC power supply 101 and the load 102. Also, the bypass circuit section 1 is commonly used for the plurality of power conversion modules 2 to 5. Note that the power conversion modules 2 to 5 are an example of the "plurality of power conversion modules" in the claims. Note that the four power conversion modules 2 to 5 have the same configuration. Therefore, only the configuration of the power conversion module 2 will be described with reference to the drawings, and the description of the other power conversion modules 3 to 5 will be omitted because their configurations are the same.

[0023] In the first embodiment, each of the power conversion modules 2 to 5 includes a power conversion section 30. That is, the bypass circuit section 1 is connected in parallel with the power conversion section 30 between the AC power supply 101 and the load 102. The power conversion section 30 includes a converter section 31, a battery 32, a chopper 33, and an inverter section 34. Note that the battery 32 is an example of the "power storage section" in the claims.

[0024] In the first embodiment, the converter section 31 converts AC power from the AC power supply 101 into DC power. The converter section 31 includes, for example, a rectifier circuit having an IGBT (Insulated Gate Bipolar Transistor). The battery 32 is configured to be chargeable with DC power. And the battery 32 outputs DC power. The chopper 33 includes a boost circuit that boosts the DC power output from the battery 32. And the inverter section 34 converts the DC power from the converter section 31 and the battery 32 into AC power. The inverter section 34 includes a plurality of switching elements that perform power conversion by performing a switching operation. The switching elements include, for example, IGBTs.

[0025] Then, the inverter unit 34 supplies the converted AC power to the load 102. Specifically, when the AC power supply 101 is normal, the DC power from the converter unit 31 is converted into AC power by the inverter unit 34 and output to the load 102. Also, when the AC power supply 101 is abnormal (during a power outage), the DC power from the battery 32 is boosted by the chopper 33, converted into AC power by the inverter unit 34, and supplied to the load 102. The converter unit 31, the battery 32, the chopper 33, and the inverter unit 34 operate based on the control by the control unit 6.

[0026] Also, the power conversion module 2 includes a switch 41 and a switch 42. The switch 41 is disposed between the AC power supply 101 and the converter unit 31. The switch 42 is disposed between the inverter unit 34 and the load 102. The switch 41 and the switch 42 open and close (switch between ON and OFF) the electric circuit based on the control of the control unit 6. The switch 41 and the switch 42 are, for example, electromagnetic contactors (contactors).

[0027] In the first embodiment, the bypass circuit unit 1 supplies the AC power from the AC power supply 101 to the load 102. The uninterruptible power supply device 100 supplies the AC power from the AC power supply 101 to the load 102 via the bypass circuit unit 1 without passing through the power conversion modules 2 to 5, for example, when the power conversion modules 2 to 5 are abnormal (faulty). Also, the bypass circuit unit 1 includes a cutoff unit 10 and a semiconductor switch unit 20. The cutoff unit 10 switches the conduction of the bypass circuit unit 1. Also, the semiconductor switch unit 20 switches the conduction of the bypass circuit unit 1 separately from the cutoff unit 10.

[0028] The cutoff unit 10 is connected in series with the semiconductor switch unit 20 on the AC power supply 101 side (upstream side) of the semiconductor switch unit 20 in the bypass circuit unit 1. The cutoff unit 10 is, for example, an air circuit breaker (ACB). The cutoff unit 10 switches the conduction of the bypass circuit unit 1. Details of the cutoff unit 10 will be described later.

[0029] Here, since the power conversion modules 2 to 5 are connected in parallel to each other, the current flowing through one power conversion module 2 (3 to 5) is smaller than that in the bypass circuit section 1. Therefore, electromagnetic contactors with relatively small rated currents (the magnitude of the current that can be passed) are used as switches 41 and 42 for opening and closing conduction in the power conversion modules 2 to 5. And in the bypass circuit section 1, an air circuit breaker with a relatively large rated current is used as a cutoff section 10 for opening and closing conduction.

[0030] The semiconductor switch section 20 includes switching elements 21 and 22. The switching elements 21 and 22 are, for example, thyristors. The semiconductor switch section 20 is composed of thyristors connected in antiparallel. The semiconductor switch section 20 switches the conduction of the bypass circuit section 1 based on a control signal from a control section 6 described later. The semiconductor switch section 20 is configured to be in a conductive state (turned ON) during bypass power supply (while supplying AC power from the AC power supply 101 to the load 102).

[0031] Also, the uninterruptible power supply device 100 includes a control section 6. The control section 6 controls the operations of each part of the uninterruptible power supply device 100. And the control section 6 controls the power conversion operation by the uninterruptible power supply device 100. Specifically, the control section 6 controls the power output in the converter section 31, the battery 32, the chopper 33, and the inverter section 34. And in the first embodiment, the control section 6 controls the conduction of the bypass circuit section 1 by the cutoff section 10 and the semiconductor switch section 20. The control section 6 includes, for example, a CPU (Central Processing Unit) and a microcomputer (microcontroller) having a flash memory.

[0032] (Configuration of the cutoff section) The cutoff section 10 is configured to conduct (close the circuit, turn on) when an ON voltage for turning on conduction is input. And the cutoff section 10 is configured to maintain the ON state even when the ON voltage disappears. In the first embodiment, a bypass voltage (the input voltage of the AC power input from the AC power source 101 to the bypass circuit section 1) is input to the cutoff section 10 as the ON voltage. That is, the cutoff section 10 is configured to conduct (turn on) when the bypass voltage, which is the input voltage of the AC power from the AC power source 101 to the bypass circuit section 1, is applied.

[0033] And the cutoff section 10 is configured to open the circuit and turn it into a non-conducting state (cut off) when the bypass voltage is smaller than a predetermined threshold value. The cutoff section 10 is provided for backfeed protection to prevent current from flowing backward to the input side (AC power source 101 side) of the bypass circuit section 1 by cutting off conduction (turning off) when no bypass voltage is applied.

[0034] As shown in FIG. 2, the cutoff section 10 includes a main contact 11 and an auxiliary contact 12. Also, the cutoff section 10 includes an insertion unit 13, a removal unit 14, and a winding-up unit 15.

[0035] The main contact 11 is configured to open and close the conduction of the bypass circuit section 1. The auxiliary contact 12 is provided separately from the main contact 11. And the auxiliary contact 12 operates in conjunction with the main contact 11. Specifically, in the first embodiment, the auxiliary contact 12 is configured to open the circuit after the closing operation of the main contact 11 in conjunction with the closing operation of the main contact 11. That is, the cutoff section 10 is configured to close the auxiliary contact 12 with a delay from the opening operation of the main contact 11 when the main contact 11 opens. Also, the cutoff section 10 is configured to open the auxiliary contact 12 with a delay from the closing operation of the main contact 11 when the main contact 11 closes.

[0036] As shown in FIG. 3, in the first embodiment, the auxiliary contact 12 is connected in series with an input unit 13, which will be described later. Specifically, the auxiliary contact 12 is arranged to open and close conduction for applying a bypass voltage to the input unit 13.

[0037] AC power from the AC power supply 101 to the bypass circuit unit 1 is applied to each of the input unit 13, the removal unit 14, and the winding-up unit 15 of the cutoff unit 10. Specifically, the AC power from the AC power supply 101 input to the bypass circuit unit 1 is branched, stepped down by a step-down transformer circuit (not shown), and applied to each of the input unit 13, the removal unit 14, and the winding-up unit 15.

[0038] The input unit 13 is configured to operate to close the main contact 11. The input unit 13 has an input coil 13a and an input spring 13b. The input unit 13 is configured to excite the input coil 13a when current flows to close the main contact 11. Specifically, when the input coil 13a of the input unit 13 is excited, the elastic energy of the input spring 13b that biases the main contact 11 to operate is released, and the main contact 11 operates to close. Further, the main contact 11 of the cutoff unit 10 is configured to maintain the closed state (ON state) even when the input to the input unit 13 is lost (when the excitation of the input coil 13a is lost).

[0039] The disconnection unit 14 is configured to operate to open the main contact 11 based on the bypass voltage. In the first embodiment, the disconnection unit 14 is configured to operate to open the main contact 11 when the applied bypass voltage is smaller than a predetermined threshold value. The disconnection unit 14 has a disconnection coil 14a. The disconnection unit 14 is configured to excite the disconnection coil 14a while the bypass voltage is being applied, so that the conduction of the main contact 11 is maintained. And, the disconnection unit 14 is configured to operate to open (turn off) the main contact 11 when the bypass voltage becomes smaller than the predetermined threshold value, by reducing the excitation (magnetic force) of the disconnection coil 14a. That is, the disconnection unit 14 includes an under-voltage disconnection device. Also, the predetermined threshold value is, for example, 50% of the rated voltage of the bypass voltage.

[0040] The winding-up unit 15 is configured to bias the closing spring 13b for performing the closing operation of the main contact 11 based on the bypass voltage. The winding-up unit 15 has, for example, a motor 15a. The motor 15a of the winding-up unit 15 is configured to bias the closing spring 13b when the bypass voltage is applied.

[0041] Also, the uninterruptible power supply device 100 according to the first embodiment includes an input switch unit 50. The input switch unit 50 is configured to switch conduction based on an operation signal from the control unit 6. The input switch unit 50 is, for example, an electromagnetic relay. The input switch unit 50 is configured to conduct (turn on) in a state where an operation signal from the control unit 6 is input. And, the input switch unit 50 is configured to cut off (turn off) when the input of the operation signal (application of voltage by the operation signal) stops. In the first embodiment, the input switch unit 50 is connected in series with the input unit 13 of the cutoff unit 10.

[0042] Further, the cutoff unit 10 is configured such that the input (bypass voltage) to the input unit 13 is not applied, a voltage equal to or higher than a predetermined threshold is applied to the removal unit 14, and the main contact 11 can be closed (energized) in a state where the winding-up of the input spring 13b by the motor 15a of the winding-up unit 15 is completed. That is, the cutoff unit 10 is configured to operate the input unit 13 in a state where the preparation for energizing the main contact 11 is completed.

[0043] (Operation of the cutoff unit) Next, with reference to FIG. 4, the opening / closing operation of the conduction of the bypass circuit unit 1 by the cutoff unit 10 will be described.

[0044] First, at time point T0 in FIG. 4, a bypass voltage is applied and the main contact 11 of the cutoff unit 10 is open. In this state, the input spring 13b is sufficiently biased and a bypass voltage is applied to the removal unit 14. That is, at time point T0, the cutoff unit 10 has completed the preparation for closing the main contact 11.

[0045] Next, at time point T1, an operation signal from the control unit 6 is input to the input switch unit 50. When the operation signal from the control unit 6 is input, the input switch unit 50 becomes conductive and turns ON. Also, at this time point T1, since the main contact 11 is open, the auxiliary contact 12 is closed. Therefore, both the input switch unit 50 and the auxiliary contact 12 connected in series to the input unit 13 are ON, so a bypass voltage is applied to the input unit 13. That is, at time point T1, the input coil 13a of the input unit 13 is excited, the biased input spring 13b is released, and the main contact 11 is switched from the open state (OFF) to the closed state (ON). Note that since a bypass voltage continues to be applied to the winding-up unit 15 even after time point T1, after the energy of the input spring 13b is released at time point T1, the input spring 13b is biased again by the motor 15a of the winding-up unit 15.

[0046] Next, at time point T2, after the main contact 11 closes, the auxiliary contact 12 opens in conjunction with the operation of the main contact 11. The auxiliary contact 12 connected in series to the input unit 13 opens and turns off, blocking the input of the bypass voltage to the input unit 13. That is, the excitation of the input coil 13a of the input unit 13 turns off. In the cutoff unit 10, the main contact 11 remains closed (ON) even when the input of the ON voltage disappears.

[0047] Thereafter, at time point T3, when the input of the bypass voltage (input from the AC power supply 101 to the bypass circuit unit 1) disappears, the cutoff unit 10 is configured to automatically cut off the bypass circuit unit 1. Specifically, at time point T3, based on the fact that the input of the bypass voltage to the removal unit 14 becomes smaller than a predetermined threshold value, the excitation of the removal coil 14a of the removal unit 14 changes, and the main contact 11 operates to open.

[0048] Also, at time point T4, when the bypass voltage is applied again, based on the operation signal from the control unit 6, the main contact 11 turns ON in the same manner as at time point T1.

[0049] As described above, in the first embodiment, the input unit 13 is configured to operate to close the main contact 11 of the cutoff unit 10 based on the bypass voltage applied through the input switch unit 50 in a state where the input switch unit 50 is closed based on the operation signal from the control unit 6. Also, in the first embodiment, when the auxiliary contact 12 operates to cancel the input of the operation signal to the input unit 13, the cutoff unit 10 is configured to prepare for the operation of closing the main contact 11 again.

[0050] (Effect of the First Embodiment) In the first embodiment, the following effects can be obtained.

[0051] In the first embodiment, as described above, the cutoff unit 10 includes an input unit 13 that operates to close the main contact 11 and a removal unit 14 that operates to open the main contact 11. The removal unit 14 is configured to operate to open the main contact 11 based on the bypass voltage, which is the input voltage of the AC power from the AC power supply 101 to the bypass circuit unit 1. Thereby, when opening and closing the conduction of the bypass circuit unit 1 by the cutoff unit 10 including the input unit 13 for closing the main contact 11 and the removal unit 14 for opening the main contact 11, without providing a drive circuit for generating a signal for closing the main contact 11 and a signal for opening the main contact 11, the main contact 11 of the cutoff unit 10 can be opened based on the input bypass voltage. Therefore, it is possible to suppress the complication of the device configuration for opening and closing (switching between ON and OFF) the conduction of the bypass circuit unit 1. As a result, even when switching the conduction of the bypass circuit unit 1 using the cutoff unit 10 that requires a signal for closing the main contact 11 and a signal for opening the main contact 11, it is possible to suppress the complication of the device configuration.

[0052] Also, in the first embodiment, as described above, it includes a power conversion unit 30 and further includes a plurality of power conversion modules 2 to 5 connected in parallel to each other. The bypass circuit unit 1 is connected in parallel between the AC power supply 101 and the load 102 and is commonly used for the plurality of power conversion modules 2 to 5. The main contact 11 of the cutoff unit 10 is configured to open and close the conduction of the bypass circuit unit 1 connected in parallel to the plurality of power conversion modules 2 to 5. Thereby, even when configured to be able to output a relatively large capacity by including a plurality of power conversion modules 2 to 5 connected in parallel to each other, the main contact 11 of the cutoff unit 10 can be opened based on the input bypass voltage. Therefore, it is possible to effectively suppress the complication of the device configuration for opening and closing (switching between ON and OFF) the conduction of the bypass circuit unit 1 that is commonly used for the plurality of power conversion modules 2 to 5.

[0053] Also, in the first embodiment, as described above, a control unit 6 that controls the conduction of the bypass circuit unit 1 by the cutoff unit 10, and an input switch unit 50 that is connected in series with the input unit 13 of the cutoff unit 10 and switches conduction based on an operation signal from the control unit 6 are further provided. The input unit 13 is configured to operate to close the main contact 11 of the cutoff unit 10 based on the bypass voltage applied through the input switch unit 50 in a state where the input switch unit 50 is closed based on the operation signal. Thereby, based on the operation signal from the control unit 6, by applying a bypass voltage to the input unit 13, the main contact 11 of the cutoff unit 10 can be operated to close. Therefore, by controlling the operation signal from the control unit 6, the bypass circuit unit 1 can be easily made conductive (turned ON). As a result, while suppressing the complication of the device configuration, the bypass circuit unit 1 can be easily made conductive using the cutoff unit 10.

[0054] Also, in the first embodiment, as described above, the removal unit 14 is configured to operate to open the main contact 11 when the applied bypass voltage is smaller than a predetermined threshold value. Thereby, by applying a bypass voltage to the removal unit 14, the bypass circuit unit 1 can be easily cut off (turned OFF) without providing a configuration for generating a signal for opening (removing) the main contact 11. Therefore, the bypass circuit unit 1 can be easily cut off when the bypass voltage is smaller than a predetermined threshold value without complicating the device configuration for cutting off the bypass circuit unit 1. As a result, even when opening and closing the conduction of the bypass circuit unit 1 using the cutoff unit 10 including the input unit 13 and the removal unit 14, the bypass circuit unit 1 can be more easily cut off while suppressing the complication of the device configuration.

[0055] Also, in the first embodiment, as described above, a semiconductor switch unit 20 is further provided that includes the switching elements 21 and 22 and switches the conduction of the bypass circuit unit 1 separately from the blocking unit 10. The blocking unit 10 is connected in series with the semiconductor switch unit 20 on the AC power supply 101 side of the semiconductor switch unit 20 in the bypass circuit unit 1. As a result, in the bypass circuit unit 1, since the semiconductor switch unit 20 and the blocking unit 10 are connected in series, the output of AC power by the power conversion unit 30 and the output of AC power from the bypass circuit unit 1 can be switched by the semiconductor switch unit 20, and the conduction of the blocking unit 10 can be easily switched based on the bypass voltage. Therefore, the semiconductor switch unit 20 with better responsiveness than the blocking unit 10 can easily block the bypass circuit unit 1 by the blocking unit 10 while switching the output of AC power.

[0056] Also, in the first embodiment, as described above, the blocking unit 10 has an auxiliary contact 12 that operates in conjunction with the main contact 11 separately from the main contact 11. The auxiliary contact 12 is connected in series with the input unit 13 and is configured to block the conduction to the input unit 13 after the closing operation of the main contact 11 in conjunction with the closing operation of the main contact 11. Here, the blocking unit 10 including the input unit 13 and the removal unit 14 needs to block the input of a signal to the input unit 13 after operating the input unit 13 to close the main contact 11. In contrast, in the first embodiment, the auxiliary contact 12 is connected in series with the input unit 13 and is configured to block the conduction to the input unit 13 after the closing operation of the main contact 11 in conjunction with the closing operation of the main contact 11. As a result, after operating the input unit 13 to close the main contact 11, the input of a signal to the input unit 13 can be easily blocked by using the auxiliary contact 12 provided in the blocking unit 10. As a result, the input of a signal to the input unit 13 can be easily blocked by using the auxiliary contact 12 provided in the blocking unit 10.

[0057] Also, in the first embodiment, as described above, the cutoff unit 10 further includes a winding-up unit 15 configured to bias the closing spring 13b for closing the main contact 11 based on the bypass voltage. Thereby, the closing spring 13b can be biased based on the bypass voltage. Therefore, the closing spring 13b can be easily biased using the bypass voltage without newly providing a configuration for generating a signal for biasing the closing spring 13b.

[0058] [Second Embodiment] Referring to FIGS. 5 and 6, the overall configuration of the uninterruptible power supply device 200 according to the second embodiment of the present invention will be described. Different from the first embodiment in which the auxiliary contact 12 is configured to be connected in series with the input unit 13, in the second embodiment, the monitoring unit 212 is configured to be connected in series with the input unit 13. For the same configuration as that in the first embodiment, the same reference numerals are given and the description thereof is omitted.

[0059] As shown in FIG. 5, the uninterruptible power supply device 200 according to the second embodiment includes a bypass circuit unit 201, power conversion modules 2 to 5, and a control unit 6. The bypass circuit unit 201 includes a cutoff unit 210 and a semiconductor switch unit 20. The cutoff unit 210 is configured to switch (open and close) the conduction of the bypass circuit unit 201, similar to the cutoff unit 10 in the first embodiment. The configurations of the power conversion modules 2 to 5 and the control unit 6 are the same as those in the first embodiment. Also, the configuration of the semiconductor switch unit 20 is the same as that in the first embodiment.

[0060] As shown in FIG. 6, in the second embodiment, the cutoff unit 210 includes a monitoring unit 212. The monitoring unit 212 monitors the input to the input unit 13.

[0061] Also, in the second embodiment, the monitoring unit 212 is connected in series with the input unit 13. When the monitoring unit 212 detects an input (signal) for operating the input unit 13, it is configured to cut off the input of the signal (turn it OFF) by cutting off the conduction to the input unit 13 after the closing operation of the main contact 11.

[0062] Specifically, the monitoring unit 212 is configured to turn ON the input of the signal to the input unit 13 when no input (bypass voltage) is applied to the input unit 13, a voltage equal to or higher than a predetermined threshold is applied to the removal unit 14, and the winding-up of the input spring 13b by the motor 15a of the winding-up unit 15 is completed. That is, the monitoring unit 212 monitors whether the preparation for closing (turning ON) the main contact 11 is completed. When the preparation for closing the main contact 11 is completed, the monitoring unit 212 is configured to conduct so that a bypass voltage can be applied to the input unit 13. When a bypass voltage is applied to the input coil 13a of the input unit 13 and the bypass circuit portion 201 is conducting (turned ON), the monitoring unit 212 is configured to cut off the input of the signal to the input unit 13.

[0063] Other configurations according to the second embodiment are the same as those of the first embodiment.

[0064] (Effect of the Second Embodiment) In the second embodiment, the following effects can be obtained.

[0065] In the second embodiment, as described above, the cutoff unit 210 further includes a monitoring unit 212 that monitors the input to the input unit 13. The monitoring unit 212 is connected in series with the input unit 13 and is configured to cut off the conduction to the input unit 13 after the closing operation of the main contact 11 when detecting an input for operating the input unit 13. Thereby, even when the auxiliary contact is not configured to operate after the main contact 11, by using the monitoring unit 212, the conduction to the input unit 13 can be cut off after the closing operation of the main contact 11. Therefore, by using the monitoring unit 212, even when the auxiliary contact cannot be used, the input of the signal to the input unit 13 can be easily cut off. Further, other effects according to the second embodiment are the same as those of the first embodiment.

[0066] [Third Embodiment] Next, with reference to FIGS. 7 and 8, the configuration of the uninterruptible power supply device 300 according to the third embodiment of the present invention will be described. In the bypass circuit unit 1, different from the first embodiment in which the cutoff unit 10 is connected in series with the semiconductor switch unit 20, in the third embodiment, the cutoff unit 310 is configured to be connected in parallel with the semiconductor switch unit 320. Note that the same components as those in the first and second embodiments are denoted by the same reference numerals and the description thereof is omitted.

[0067] As shown in FIG. 7, the uninterruptible power supply device 300 according to the third embodiment includes a bypass circuit unit 301, power conversion modules 2 to 5, and a control unit 306. The bypass circuit unit 301 includes a cutoff unit 310 and a semiconductor switch unit 320. In the third embodiment, in the bypass circuit unit 301, the cutoff unit 310 and the semiconductor switch unit 320 are connected in parallel with each other. Note that the power conversion modules 2 to 5 have the same configuration as that in the first embodiment.

[0068] As shown in FIG. 8, in the third embodiment, the cutoff unit 310 includes a removal unit 314. The removal unit 314 has a removal coil. And in the third embodiment, the removal unit 314 is configured to open (turn OFF) the main contact 11 based on a voltage greater than a predetermined threshold being applied (input). Specifically, the removal unit 314 is configured to operate to open the main contact 11 by exciting the removal coil when the bypass voltage applied is greater than a predetermined threshold.

[0069] Also, the uninterruptible power supply device 300 according to the third embodiment includes a removal switch unit 351 separately from the input switch unit 50. In the third embodiment, the removal switch unit 351 is connected in series with the removal unit 314 of the cutoff unit 310 and is configured to switch conduction based on an operation signal from the control unit 306. And in the cutoff unit 310 according to the third embodiment, the removal unit 314 is configured to operate to open the main contact 11 of the cutoff unit 310 based on the bypass voltage applied through the removal switch unit 351 when the removal switch unit 351 closes based on an operation signal from the control unit 306.

[0070] Specifically, the removal switch unit 351 switches conduction based on an operation signal similar to that of the input switch unit 50. Different from the input switch unit 50, the removal switch unit 351 is configured to open (turn OFF) the circuit while an operation signal from the control unit 306 is being input and to close (turn ON) the circuit while an operation signal from the control unit 306 is not being input. For example, the removal switch unit 351 includes a normally-on (b contact) electromagnetic relay.

[0071] And in the third embodiment, the control unit 306 outputs a common operation signal to both the insertion switch unit 50 and the removal switch unit 351. For example, when an abnormality such as an abnormality in the power conversion unit 30 occurs and the power supply is switched to the bypass circuit unit 301, the control unit 306 outputs a common operation signal to both the insertion switch unit 50 and the removal switch unit 351. When the common operation signal from the control unit 306 is input, the insertion switch unit 50 turns ON and the removal switch unit 351 turns OFF. Also, when the input of the common operation signal from the control unit 306 is stopped, the insertion switch unit 50 turns OFF and the removal switch unit 351 turns ON.

[0072] That is, in the third embodiment, the removal unit 314 is configured such that a bypass voltage is applied when no operation signal is output from the control unit 306. Therefore, in the cutoff unit 310 according to the third embodiment, when no operation signal is output from the control unit 306, the main contact 11 is opened (turned OFF). Also, the configuration of the insertion unit 13 is the same as that in the first embodiment. That is, the cutoff unit 310 according to the third embodiment is configured to close (turn ON) the main contact 11 while an operation signal is output from the control unit 306.

[0073] Also, the semiconductor switch unit 320 includes thyristors connected in antiparallel, similar to the semiconductor switch unit 20 according to the first embodiment. And the semiconductor switch unit 20 is configured to switch the conduction of the bypass circuit unit 301 based on a control signal from the control unit 306.

[0074] In the uninterruptible power supply device 300 according to the third embodiment, when the control unit 306 switches from the state of supplying power to the load 102 from the inverter unit 34 to supplying AC power to the load 102 via the bypass circuit unit 301, the control unit 306 controls both the cutoff unit 310 and the semiconductor switch unit 320 to switch from OFF to ON simultaneously. In that case, since the semiconductor switch unit 320 has a higher response speed than the cutoff unit 310, the bypass circuit unit 301 is first conducted by the semiconductor switch unit 320, and then the cutoff unit 310 is closed (turned ON). In the third embodiment, the uninterruptible power supply device 300 is configured to turn off the semiconductor switch unit 320 after the cutoff unit 310 is turned ON. That is, during bypass power supply (while supplying power from the AC power supply 101 to the load 102 via the bypass circuit unit 301), power is mainly supplied by closing (turning ON) the cutoff unit 310. The semiconductor switch unit 320 is used auxiliary (turned ON for a predetermined time) when the cutoff unit 310 is opened (turned OFF) and closed (turned ON).

[0075] Other configurations according to the third embodiment are the same as those of the first embodiment.

[0076] (Effect of the Third Embodiment) In the third embodiment, the following effects can be obtained.

[0077] In the third embodiment, as described above, a disconnecting switch unit 351 is further provided, which is connected in series with the removal unit 314 of the blocking unit 310 and switches conduction based on an operation signal from the control unit 306. The removal unit 314 is configured to operate to open the main contact 11 of the blocking unit 310 based on a bypass voltage applied through the disconnecting switch unit 351 when the disconnecting switch unit 351 closes based on the operation signal. Thereby, even when there is no change in the bypass voltage, by switching the conduction of the disconnecting switch unit 351, the main contact 11 of the blocking unit 310 can be opened (blocked) by the removal unit 314. Therefore, even when the bypass voltage is normal, the bypass circuit unit 301 can be blocked using the blocking unit 310 including the input unit 13 and the removal unit 314. As a result, even when the bypass voltage is normal, it is possible to suppress the complication of the device configuration for switching the conduction of the bypass circuit unit 301. Further, other effects according to the third embodiment are the same as those of the first and second embodiments.

[0078] [Modification Example] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the description of the above embodiments but by the claims, and further includes all changes (modification examples) within the meaning and scope equivalent to the claims.

[0079] For example, in the above first to third embodiments, an example including a plurality of power conversion modules 2 to 5 connected in parallel to each other is shown, but the present invention is not limited to this. In the present invention, it may be configured to include one power conversion module.

[0080] Also, in the above-described first to third embodiments, an example in which the input switch unit 50 that switches the conduction to the input unit 13 based on the operation signal from the control unit 6 (306) is an electromagnetic relay (electromagnetic relay) has been shown, but the present invention is not limited to this. For example, the input switch unit may be a switching element. Similarly, the removal switch unit 351 according to the third embodiment may be a switching element instead of an electromagnetic relay (electromagnetic relay).

[0081] Also, in the above-described first to third embodiments, an example in which the cutoff unit 10 (210, 310) is configured to include the winding unit 15 has been shown, but the present invention is not limited to this. For example, the cutoff unit may be configured without the winding unit 15 and manually bias the input spring 13b.

[0082] Also, in the above-described first to third embodiments, an example in which the main contact 11 is operated by the elastic energy of the input spring 13b has been shown, but the present invention is not limited to this. For example, it may be configured to open and close the main contact by a driving force such as a motor.

[0083] Also, in the above-described first to third embodiments, an example in which the cutoff unit 10 (210, 310) is an air circuit breaker has been shown, but the present invention is not limited to this. For example, the cutoff unit may be a wiring circuit breaker (MCCB: Molded Case Circuit Breaker). However, generally, since the allowable number of opening and closing operations of a wiring circuit breaker is smaller than that of an air circuit breaker, it is more preferable that the cutoff unit is an air circuit breaker. Also, by using a draw-out type air circuit breaker, the maintainability can be improved.

[0084] In the above-described first and second embodiments, an example in which the cutoff unit 10 (210) and the semiconductor switch unit 20 are connected in series is shown, and in the above-described third embodiment, an example in which the cutoff unit 310 and the semiconductor switch unit 320 are connected in parallel is shown. However, the present invention is not limited to this. For example, as in the bypass circuit unit 401 shown in FIG. 9, the cutoff unit 10 according to the first embodiment and the cutoff unit 310 according to the third embodiment may be combined and used. With this configuration, the cutoff unit 10 connected in series can perform backfeed protection in the same manner as in the first embodiment, and by connecting the cutoff unit 310 and the semiconductor switch unit 320 in parallel, as in the third embodiment, during bypass power supply, power is mainly supplied by closing the cutoff unit 310, and the semiconductor switch unit 320 can be configured to be used as an auxiliary.

Explanation of Signs

[0085] 1, 201, 301, 401 Bypass circuit unit 2, 3, 4, 5 Power conversion module 6, 306 Control unit 10, 210, 310 Cutoff unit 11 Main contact 12 Auxiliary contact 13 Input unit 13b Input spring 14, 314 Removal unit 15 Hoisting unit 20, 320 Semiconductor switch unit 21, 22 Switching element 30 Power conversion unit 31 Converter unit 32 Battery (power storage unit) 34 Inverter unit 50 Input switch unit 100, 200, 300 Uninterruptible power supply device 101 AC power supply 102 Load 212 Monitoring unit 351 Removal switch unit

Claims

1. A power conversion unit including a converter unit that converts AC power from an AC power source into DC power, a power storage unit that outputs DC power, and an inverter unit that converts the DC power from the converter unit and the power storage unit into AC power and supplies the converted AC power to a load; A bypass circuit unit connected in parallel with the power conversion unit between the AC power source and the load, and supplying AC power from the AC power source to the load; A cutoff unit including a main contact that opens and closes the conduction of the bypass circuit unit, an input unit that operates based on a first signal that closes the main contact, and a removal unit that operates based on a second signal different from the first signal that opens the main contact; The first signal and the second signal are independently generated based on a common bypass voltage that is the input voltage of the AC power from the AC power source to the bypass circuit unit, and are input to the input unit and the removal unit of the cutoff unit, respectively. An uninterruptible power supply.

2. Including the power conversion unit, further comprising a plurality of power conversion modules connected in parallel with each other; The bypass circuit unit is connected in parallel with the plurality of power conversion modules between the AC power source and the load, and is commonly used for the plurality of power conversion modules; The main contact of the cutoff unit opens and closes the conduction of the bypass circuit unit connected in parallel with the plurality of power conversion modules. The uninterruptible power supply according to claim 1.

3. A control unit that controls the conduction of the bypass circuit unit by the cutoff unit; Further comprising an input switch unit connected in series with the input unit of the cutoff unit and switching conduction based on an operation signal from the control unit; The input unit is configured to operate to close the main contact of the cutoff unit based on the bypass voltage applied through the input switch unit in a state where the input switch unit is closed based on the operation signal. The uninterruptible power supply according to claim 1 or 2.

4. The removal unit is configured to operate to open the main contact when the applied bypass voltage is smaller than a predetermined threshold value. The uninterruptible power supply according to any one of claims 1 to 3.

5. Including a switching element, further comprising a semiconductor switch unit that switches the conduction of the bypass circuit unit separately from the cutoff unit; The power cut-off unit according to claim 4 of the uninterruptible power supply device, wherein in the bypass circuit unit, the power cut-off unit is connected in series with the semiconductor switch unit on the AC power supply side of the semiconductor switch unit.

6. The power cut-off unit further includes a disconnect switch unit connected in series with the removal unit, and configured to switch conduction based on the operation signal from the control unit. The removal unit is configured to operate to open the main contact of the power cut-off unit based on the bypass voltage applied through the removal switch unit when the removal switch unit closes based on the operation signal, according to the uninterruptible power supply device of claim 3.

7. The power cut-off unit has an auxiliary contact that operates in conjunction with the main contact separately from the main contact. The auxiliary contact is connected in series with the input unit, and is configured to cut off conduction to the input unit after the closing operation of the main contact in conjunction with the closing operation of the main contact, according to the uninterruptible power supply device of any one of claims 1 to 6.

8. The power cut-off unit further includes a monitoring unit for monitoring the input to the input unit. The monitoring unit is connected in series with the input unit, and is configured to cut off conduction to the input unit after the closing operation of the main contact when detecting an input for operating the input unit, according to the uninterruptible power supply device of any one of claims 1 to 6.

9. The power cut-off unit further includes a winding-up unit configured to urge a closing spring for closing the main contact based on the bypass voltage, according to the uninterruptible power supply device of any one of claims 1 to 8.

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