Power conversion device and uninterruptible power supply including the same

Abstract

To enable easy exchange of a capacitor disposed in a power conversion device.SOLUTION: A power conversion device includes a capacitor 100, a bus bar 110, a tray member 140, and a housing 150. The capacitor 100 includes an electrode terminal 101 at an end part in a first direction. The bus bar 110 is electrically connected to the electrode terminal 101 and covers the capacitor 100 from the first direction. In the tray member 140, the capacitor 100 is placed. The housing 150 accommodates the capacitor 100 and the tray member 140 in such a way that insertion and extraction are possible. The housing 150 includes an opening part 153. The opening part 153 is open toward a second direction that is orthogonal to the first direction. The tray member 140 can be inserted into and extracted from the opening part 153 in the second direction together with the capacitor 100 in a state where the electrode terminal 101 and the bus bar 110 are disconnected.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to a power conversion device and an uninterruptible power supply including the same. [Background technology]

[0002] Japanese Patent No. 5418847 (Patent Document 1) is a prior art document that discloses the configuration of a power conversion device. The power conversion device described in Patent Document 1 includes an inverter unit. The inverter unit includes a circuit-side case having a right-side face plate. A capacitor block is disposed within the circuit-side case. When replacing the electrolytic capacitor disposed in the capacitor block with a new electrolytic capacitor, the right-side face plate is removed from the circuit-side case, and the capacitor unit is removed from the circuit-side case.

[0003] Japanese Patent No. 6818232 (Patent Document 2) is a prior art document that discloses the configuration of a power supply device. The power supply device described in Patent Document 2 includes a power conversion device. The power conversion device includes a capacitor unit and a power conversion unit. The power conversion unit has a semiconductor module. A capacitor arranged in the capacitor unit is electrically connected to the semiconductor module via a plate-shaped conductive member. When removing the capacitor unit from the power conversion device, the connection between the semiconductor module and the capacitor unit is released. When removing the capacitor from the capacitor unit, the connection between the capacitor unit and the plate-shaped conductive member is released, and the plate-shaped conductive member is removed from the capacitor unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5418847 [Patent Document 2] Patent No. 6818232 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Documents 1 and 2, when removing a capacitor from a power converter, it is necessary to remove a part of the housing arranged around the capacitor or a conductive member connected to the capacitor from the power converter, which makes it difficult to easily replace a capacitor arranged inside the power converter.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a power conversion device and an uninterruptible power supply device including the same, in which capacitors placed inside the device can be easily replaced. [Means for solving the problem]

[0007] A power conversion device according to the present disclosure includes a capacitor, a bus bar, a tray member, and a housing. The capacitor has an electrode terminal at an end in a first direction. The bus bar is electrically connected to the electrode terminal and covers the capacitor from the first direction. The capacitor is placed on the tray member. The housing accommodates the capacitor and the tray member in a removable manner. The housing has an opening. The opening faces a second direction perpendicular to the first direction. The tray member can be inserted and removed from the opening in the second direction together with the capacitor when the electrode terminal and the bus bar are disconnected.

[0008] In one embodiment of the present disclosure, the bus bar includes a plate-shaped laminated bus bar and a plate-shaped AC bus bar. The laminated bus bar has a connection portion connected to an electrode terminal. The AC bus bar is arranged to overlap the laminated bus bar on a side of the laminated bus bar opposite to a side on which the capacitor is located in the first direction. The AC bus bar has a through portion formed therein that penetrates in the first direction at a position aligned with the connection portion in the first direction. The connection portion is accessible through the through portion from a side of the AC bus bar opposite to a side on which the laminated bus bar is located in the first direction.

[0009] In one embodiment of the present disclosure, the tray member includes a bottom plate portion on which the capacitor is placed. The housing includes a bottom surface portion and a locking portion. The bottom surface portion faces the bottom plate portion. The locking portion is provided on the bottom surface portion and locks the bottom plate portion together with the bottom surface portion.

[0010] In one embodiment of the present disclosure, the tray member and the housing each have opposing surfaces facing each other in a third direction perpendicular to each of the first direction and the second direction, and the opposing surfaces are configured to be fastened to each other by a fastening member.

[0011] An uninterruptible power supply according to the present disclosure includes a plurality of the power conversion devices and a case body that houses the plurality of power conversion devices with an opening located on the front side. [Effects of the Invention]

[0012] According to the present disclosure, capacitors arranged in a power conversion device can be easily replaced. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view illustrating a configuration of an uninterruptible power supply according to an embodiment of the present disclosure. [Figure 2] 1 is a block diagram showing a main circuit configuration of an uninterruptible power supply according to an embodiment of the present disclosure. [Figure 3] 1 is a schematic diagram illustrating a connection relationship between a power conversion device and a control device according to an embodiment of the present disclosure. [Figure 4] 1 is a perspective view illustrating a configuration of a power conversion device included in an uninterruptible power supply according to an embodiment of the present disclosure. [Figure 5] FIG. 2 is a perspective view illustrating a configuration of a capacitor and a tray member according to an embodiment of the present disclosure. [Figure 6] 1 is a top view illustrating a configuration of a power conversion device according to an embodiment of the present disclosure. [Figure 7] 1 is a cross-sectional view illustrating a configuration of a power conversion device according to an embodiment of the present disclosure. [Figure 8] 1 is a front view illustrating a configuration of a power conversion device according to an embodiment of the present disclosure. [Figure 9] 1 is a side view illustrating a configuration of a power conversion device according to an embodiment of the present disclosure. [Figure 10] FIG. 10 is a perspective view showing the configuration of a power conversion device according to a comparative example of the present disclosure. [Figure 11] 1 is a perspective view illustrating a state in which a tray member can be inserted into and removed from a housing together with a capacitor in a power conversion device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] A power conversion device and an uninterruptible power supply including the same according to an embodiment of the present disclosure will be described below with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings will be designated by the same reference numerals, and description thereof will not be repeated.

[0015] In the figure, the direction in which the side surfaces of the inverter housings face each other is the X direction as the third direction, the direction in which the tray members are inserted and removed from the housing is the Y direction as the second direction, and the direction in which the capacitors and bus bars are aligned is the Z direction as the first direction.

[0016] 1 is a perspective view showing the configuration of an uninterruptible power supply according to an embodiment of the present disclosure. As shown in FIG. 1, the uninterruptible power supply 1 according to the present embodiment includes a case body 2 and a power conversion unit 3.

[0017] The case body 2 houses inside thereof each component of the uninterruptible power supply 1. Specifically, the case body 2 houses a plurality of power conversion devices (inverters 30) described below such that openings 153 of the power conversion devices are positioned on the front side of the uninterruptible power supply 1.

[0018] In this embodiment, three sets of power conversion units 3 are arranged inside the case body 2. The three sets of power conversion units 3a, 3b, and 3c are arranged side by side in the Z direction inside the case body 2. The power conversion units 3 include a converter and an inverter as multiple power conversion devices.

[0019] The main circuit configuration of the power conversion device of the uninterruptible power supply 1 according to one embodiment of the present disclosure will be described below. Fig. 2 is a block diagram showing the main circuit configuration of the uninterruptible power supply according to one embodiment of the present disclosure.

[0020] 2, the uninterruptible power supply 1 is connected between a commercial AC power supply 10 and a load 11. The commercial AC power supply 10 supplies three-phase AC power to the uninterruptible power supply 1. The uninterruptible power supply 1 supplies the three-phase AC power to the load 11.

[0021] Specifically, commercial AC power supply 10 supplies three-phase AC voltages VR, VS, and VT of commercial frequency via R-phase line RL, S-phase line SL, and T-phase line TL to uninterruptible power supply 1. Uninterruptible power supply 1 receives three-phase AC voltages VR, VS, and VT from commercial AC power supply 10, and outputs three-phase AC voltages VU, VV, and VW of commercial frequency to load 11 via U-phase line UL, V-phase line VL, and W-phase line WL.

[0022] The uninterruptible power supply 1 further includes a DC positive bus PL, a DC negative bus NL, a DC neutral line CL, a battery 12, and a control device 13. Note that the configuration of reactors and capacitors that are disposed in the uninterruptible power supply 1 and that constitute an LC filter circuit, as well as fuses, etc., are not shown in the figure.

[0023] The power conversion units 3a, 3b, and 3c convert three-phase AC voltages VR, VS, and VT supplied from a commercial AC power supply 10 into DC voltages, and then convert the DC voltages into three-phase AC voltages VU, VV, and VW. The power conversion units 3a, 3b, and 3c supply the three-phase AC voltages VU, VV, and VW to a load 11.

[0024] The power conversion units 3 include a converter 20 and an inverter 30. Specifically, the power conversion unit 3a includes a converter 20R and an inverter 30U. The power conversion unit 3b includes a converter 20S and an inverter 30V. The power conversion unit 3c includes a converter 20T and an inverter 30W.

[0025] Each converter 20 has an AC terminal AC2, a positive DC terminal (i.e., high-potential side DC terminal) BP1, a negative DC terminal (i.e., low-potential side DC terminal) BN1, and a neutral DC terminal (i.e., medium-potential side DC terminal) BC1. Each inverter 30 has an AC terminal AC1, a positive DC terminal BP2, a negative DC terminal BN2, and a neutral DC terminal BC2.

[0026] An AC terminal AC2 of each converter 20 receives R-phase to T-phase voltages VR to VT from R-phase to T-phase lines RL to VL. Each converter 20 converts the R-phase to T-phase voltages VR to VT into DC voltages and outputs the DC voltages between DC terminals BP1, BN1, and BC1. Each converter 20 is provided with a chopper circuit (not shown).

[0027] DC terminals BP2, BN2, BC2 of each inverter 30 receive a DC voltage from each converter 20 via DC buses PL, NL, CL. Each inverter 30 converts the DC voltage into U-phase to W-phase voltages VU to VW, and outputs the U-phase to W-phase voltages VU to VW to an AC terminal AC1.

[0028] DC buses PL, NL, CL receive DC voltages generated by the respective converters 20. The battery 12 is connected between the DC positive bus PL, the DC negative bus NL, and the DC neutral bus CL.

[0029] The control device 13 controls the converter 20 and the inverter 30 to generate AC power to be supplied to the load 11 when the commercial AC power supply 10 is operating normally and when a power outage occurs. The control device 13 is mainly configured with a microcomputer including, for example, a central processing unit (CPU) and storage units such as a read-only memory (ROM) and a random access memory (RAM). The control device 13 controls the converter 20 and the inverter 30 by having the CPU read a program stored in the ROM in advance into the RAM and execute the program.

[0030] 3 is a schematic diagram illustrating a connection relationship between a power conversion device and a control device according to an embodiment of the present disclosure. As shown in FIG. 3, an inverter 30 as a power conversion device further includes a capacitor 100, a semiconductor module M, DC lines 15, 16, and 17, and an AC line 18.

[0031] The capacitor 100 is provided to smooth the current flowing through the inverter 30. The positive electrode of the capacitor 100 is connected to the DC lines 15 and 17. The negative electrode of the capacitor 100 is connected to the DC lines 16 and 17.

[0032] The semiconductor module M is composed of eight semiconductor modules M1 to M8. The semiconductor modules M1 to M4 are connected in parallel to one another to a DC line 17. The semiconductor modules M5 to M8 are connected in parallel to one another between the DC lines 15, 16, and 17. The number of semiconductor modules M is not limited to eight, and can be changed to any number including one.

[0033] The semiconductor module M has a collector terminal C1, an emitter terminal E2, a collector-emitter terminal C2E1, control terminals G1, G2, E1, E2, a diode (not shown), and a semiconductor switching element, such as an IGBT (Insulated Gate Bipolar Transistor).

[0034] The collector terminals C1 of the semiconductor modules M1 to M4 are connected to a DC line 17, and the emitter terminals E2 are connected to an AC line 18. The collector terminals C1 of the semiconductor modules M5 to M8 are connected to a DC line 15, and the emitter terminals E2 are connected to a DC line 16. The collector-emitter terminals C2E1 of the semiconductor modules M5 to M8 are connected to the AC line 18. The control terminals G1, G2, E1, E2 of each semiconductor module M are connected to a control device 13.

[0035] A DC line 15 is connected between the positive DC terminal BP2 and the collector terminal C1 of the semiconductor module M8. A DC line 16 is connected between the negative DC terminal BN2 and the emitter terminal E2 of the semiconductor module M8. A DC line 17 is connected between the neutral DC terminal BC2 and the collector terminal C1 of the semiconductor modules M1 to M4. An AC line 18 is connected between the emitter terminal E2 of the semiconductor modules M1 to M4 and an AC terminal AC2.

[0036] With the above-described configuration shown in FIGS. 2 and 3, the uninterruptible power supply 1 is controlled as follows: when the commercial AC power supply 10 is operating normally, the control device 13 converts the three-phase AC voltages VR, VS, VT applied to AC terminal AC2 from the commercial AC power supply 10 into DC voltages and supplies the DC voltages to the battery 12, while also controlling the converters 20 and the inverters 30 to convert the DC voltages into three-phase AC voltages VU, VV, VW and output them to AC terminal AC1.

[0037] On the other hand, when the commercial AC power supply 10 experiences a power outage, the control device 13 stops the operation of each converter 20 and controls each inverter 30 to convert the DC voltage generated by the DC power supplied from the battery 12 to the DC terminals BP2, BN2, BC2 into three-phase AC voltages VU, VV, VW and output them to the AC terminal AC1.

[0038] The structure of the power conversion device will be described below. Fig. 4 is a perspective view showing the configuration of a power conversion device provided in an uninterruptible power supply according to an embodiment of the present disclosure. Fig. 5 is a perspective view showing the configuration of a capacitor and a tray member according to an embodiment of the present disclosure.

[0039] 4 and 5, the power conversion device according to the embodiment of the present disclosure is an inverter 30. The inverter 30 further includes a bus bar 110, a tray member 140, a housing 150, a cover member 170, and a gate drive board 180.

[0040] The capacitors 100 are arranged inside the housing 150. In this embodiment, eight capacitors 100 are arranged for one inverter 30. The number of capacitors 100 is not limited to eight, and can be changed to any number including one.

[0041] 5, the capacitor 100 has electrode terminals 101 at its ends in the first direction (Z direction). The electrode terminals 101 have a positive terminal 101p and a negative terminal 101n. The electrode terminals 101 are electrically connected to the bus bar 110.

[0042] 4, the bus bar 110 is a current path for electrically connecting the components within the inverter 30. The bus bar 110 covers the capacitor 100 from a first direction (Z direction).

[0043] The bus bar 110 according to this embodiment includes a plate-shaped laminate bus bar 120 and a plate-shaped AC bus bar 130.

[0044] The laminated bus bar 120 is a bus bar in which a plurality of conductive layers and a plurality of insulating layers are alternately laminated in the Z direction. The laminated bus bar 120 constitutes the DC lines 15 to 17 in FIG.

[0045] The laminated bus bar 120 has DC terminals BP2, BN2, and BC2 extending from a laminated portion of multiple conductive layers and multiple insulating layers to one side in the X direction. DC power is supplied to each of the multiple conductive layers from the converter 20 via the DC terminals BP2, BN2, and BC2.

[0046] The laminated bus bar 120 is electrically connected to the capacitor 100. Specifically, the laminated bus bar 120 has a connection portion 121. The connection portion 121 is electrically connected to the electrode terminal 101. The laminated bus bar 120 and the electrode terminal 101 are connected to each other by a known connection method such as a bolt member. The capacitor 100 and the semiconductor module M are also electrically connected through the laminated bus bar 120.

[0047] The AC bus bar 130 is a current path for AC power in the inverter 30 of this embodiment. The AC bus bar 130 is formed by bending a metal plate member. The AC bus bar 130 forms the AC line 18 in FIG. 3.

[0048] An AC terminal AC1 extends from the other side in the X direction of the AC bus bar 130. AC power is supplied from the inverter 30 to the load 11 via the AC terminal AC1.

[0049] The AC bus bar 130 is arranged so as to overlap the laminate bus bar 120 on the side of the laminate bus bar 120 opposite to the side on which the capacitor 100 is located in the first direction (Z direction). As a result, the capacitor 100 is covered by the laminate bus bar 120 and the AC bus bar 130 above in the Z direction.

[0050] The AC bus bar 130 is electrically connected to the laminated bus bar 120 via the semiconductor module M. This provides an electrical connection from the DC terminals BP2, BN2, BC2 of the laminated bus bar 120 to the AC terminal AC1 of the AC bus bar 130.

[0051] In this embodiment, the bus bar 110 has the laminated bus bar 120 and the AC bus bar 130, but is not limited to this configuration. The bus bar 110 may be composed of only the laminated bus bar 120. In addition, the AC bus bar 130 does not necessarily have to be electrically connected to the laminated bus bar 120.

[0052] 4 and 5, the tray member 140 is a member on which the capacitor 100 is placed. The tray member 140 is formed by bending a sheet metal part, for example.

[0053] As shown in FIG. 5, the tray member 140 has a bottom plate portion 141, a front plate portion 142, side plate portions 144, and a receiving jig 146.

[0054] The bottom plate portion 141 is a portion on which the capacitor 100 is placed. The front plate portion 142 stands upright from one end of the bottom plate portion 141 in the Y direction. The front plate portion 142 is provided with a gripping portion 143. The tray member 140 can be moved by gripping the gripping portion 143.

[0055] The side plate portions 144 are erected from both ends in the X direction of the bottom plate portion 141. A pair of side plate portions 144 are provided facing each other in the X direction. Each of the pair of side plate portions 144 is provided with a first through hole 145 on one side in the Y direction.

[0056] The receiving jig 146 is fixed on the bottom plate portion 141. The receiving jig 146 has a cylindrical shape, and the capacitor 100 can be placed inside the receiving jig 146. By placing the capacitor 100 inside the receiving jig 146, the capacitor 100 can be positioned relative to the tray member 140.

[0057] 4, housing 150 is configured to be able to house capacitor 100 and tray member 140. Housing 150 is formed, for example, by bending a sheet metal part.

[0058] Housing 150 has bottom surface 151 and a pair of side surfaces 152. Bottom surface 151 is a portion on which capacitor 100 and tray member 140 can be placed.

[0059] The pair of side surface portions 152 are erected from both ends in the X direction of the bottom surface portion 151. An opening 153 is provided between the pair of side surface portions 152, and opens in a second direction (Y direction) perpendicular to the first direction (Z direction).

[0060] The semiconductor module M is disposed on the other side in the Y direction relative to the capacitor 100. The semiconductor module M is disposed below the cover member 170. The gate drive board 180 controls the driving of the semiconductor module M. The gate drive board 180 is disposed on the cover member 170 which is disposed on the semiconductor module M.

[0061] Fig. 6 is a top view showing a configuration of a power conversion device according to an embodiment of the present disclosure. As shown in Fig. 6, a plurality of through-holes 131 are formed in an AC bus bar 130. The through-holes 131 penetrate in the first direction (Z direction) at positions aligned with the connection portions 121 in the first direction (Z direction).

[0062] The plurality of through-holes 131 in this embodiment have an elongated hole shape or a notched shape. When the through-holes 131 have an elongated hole shape, the through-holes 131 extend with their longitudinal direction in the X direction. When the through-holes 131 are located at the ends of the AC busbar 130, the through-holes 131 have a notched shape. By connecting the through-holes 131 corresponding to the connecting portions 121 to form an elongated hole shape or a notched shape, the number of through-holes 131 that need to be machined can be reduced, thereby reducing the processing costs.

[0063] The connection portion 121 is accessible through the through portion 131 from the side of the AC busbar 130 opposite to the side on which the laminate busbar 120 is located in the first direction (Z direction). In this case, a tool for disconnecting the electrode terminal 101 and the laminate busbar 120 can be inserted from the through portion 131 toward the connection portion 121 in the Z direction. This makes it possible to disconnect the electrode terminal 101 of the capacitor 100 from the laminate busbar 120 without removing the AC busbar 130 from the inverter 30.

[0064] 7 is a cross-sectional view showing a configuration of a power converter according to an embodiment of the present disclosure. As shown in FIG. 7, housing 150 further has locking portion 154. Bottom surface portion 151 of housing 150 faces bottom plate portion 141 of tray member 140.

[0065] The locking portion 154 is provided on the bottom surface portion 151. In this embodiment, the locking portion 154 is formed by bending a plate-like member into an L-shape.

[0066] The locking portion 154 locks the bottom plate portion 141 together with the bottom surface portion 151. Specifically, the side of the locking portion 154 that is bent into an L shape and that contacts the tray member 140 along the bottom surface portion 151 is curved back relative to the bottom surface portion 151. As a result, a gap is formed in the first direction (Z direction) between the bottom surface portion 151 and the locking portion 154 at the tip of the locking portion 154. The tray member 140 is fixed to the housing 150 by sandwiching the bottom plate portion 141 between the bottom surface portion 151 and the locking portion 154 in this gap. By arranging the locking portion 154 in this way, the tray member 140 can be fixed to the housing 150 with a simple configuration.

[0067] Fig. 8 is a front view showing the configuration of a power conversion device according to an embodiment of the present disclosure.Fig. 9 is a side view showing the configuration of a power conversion device according to an embodiment of the present disclosure.

[0068] 8 and 9, tray member 140 and housing 150 each have opposing surfaces that face each other in a third direction (X direction) that is perpendicular to each of the first direction (Z direction) and the second direction (Y direction). In this embodiment, side plate portion 144 of tray member 140 and side surface portion 152 of housing 150 face each other as the opposing surfaces.

[0069] 9, in this embodiment, a second through-hole 155 is provided in a side surface portion 152 of a housing 150. The second through-hole 155 is positioned so as to face the first through-hole 145 of the tray member 140 shown in FIG.

[0070] The opposing surfaces are configured to be fastened to each other by fastening members 160. In the present embodiment, side plate portions 144 of tray member 140 and side surface portions 152 of housing 150 are configured to be fastened to each other by fastening members 160. Specifically, side plate portions 144 and side surface portions 152 are fastened to each other by fastening members 160 while fastening members 160 are inserted through first through holes 145 and second through holes 155. As a result, when tray member 140 is housed inside housing 150, tray member 140 and housing 150 can be fixed together by fastening members 160.

[0071] Fastening member 160 is configured by, for example, a bolt member and a nut member. In the present embodiment, the bolt member is inserted from first through hole 145 toward second through hole 155, and a nut member disposed on side surface portion 152 is screwed onto the bolt member, thereby fastening the bolt member and the nut member together.

[0072] When the bolt member is inserted from the first through-hole 145 toward the second through-hole 155, the head of the bolt member is disposed on the tray member 140 side of the housing 150. In this case, as shown in Fig. 8, the head of the bolt member can be exposed on the front side of the inverter 30, i.e., on the front side of the uninterruptible power supply 1, and therefore the fastening member 160 can be easily removed from the front side of the uninterruptible power supply 1.

[0073] The configuration for fastening the side plate portion 144 and the side surface portion 152 together is not limited to the configuration of the fastening member 160 having through holes in the side plate portion 144 and the side surface portion 152. The configuration for fastening the side plate portion 144 and the side surface portion 152 together may be a configuration in which a non-through female thread portion is provided in the side plate portion 144 or the side surface portion 152 and a bolt member is screwed into the female thread portion to fasten the side plate portion 144 and the side surface portion 152 together.

[0074] Here, a power conversion device according to a comparative example of the present disclosure will be described. The power conversion device according to the comparative example differs from the power conversion device (inverter 30) according to an embodiment of the present disclosure in that a tray member is not provided, and therefore, description of the configuration that is similar to that of the power conversion device (inverter 30) according to an embodiment of the present disclosure will not be repeated.

[0075] 10 is a perspective view showing the configuration of a power conversion device according to a comparative example of the present disclosure. As shown in FIG. 10, an inverter 930 as a power conversion device according to the comparative example of the present disclosure includes a capacitor 100, a bus bar 110, a housing 950, a semiconductor module M, a cover member 170, and a gate drive board 180.

[0076] Housing 950 has a bottom surface portion 951. Receiving jig 953 is disposed on bottom surface portion 951. Receiving jig 953 is fixed to bottom surface portion 951. Capacitor 100 is disposed inside receiving jig 953.

[0077] When removing the capacitor 100 of the inverter 930 according to this comparative example in order to replace it with a new capacitor, first, the cover member 170 is removed from the semiconductor module M together with the gate drive board 180. Next, the AC bus bar 130 is removed from the laminate bus bar 120. Next, the connection between the electrode terminal 101 and the laminate bus bar 120 at the connection portion 121 of the laminate bus bar 120 is released. Thereafter, the laminate bus bar 120 is removed from the housing 950. This allows the capacitor 100 to be removed from the receiving jig 953.

[0078] FIG. 11 is a perspective view illustrating a state in which a tray member can be inserted into and removed from a housing together with a capacitor in a power converter according to an embodiment of the present disclosure.

[0079] 11, in contrast to the comparative example, in inverter 30 as a power conversion device according to an embodiment of the present disclosure, opening 153 is formed and tray member 140 on which capacitor 100 is placed is disposed. Thus, housing 150 accommodates capacitor 100 and tray member 140 in a removable manner.

[0080] Tray member 140 can be inserted into and removed from opening 153 in the second direction (Y direction) together with capacitor 100 when electrode terminal 101 is disconnected from bus bar 110. In this embodiment, tray member 140 can be inserted into and removed from opening 153 in the second direction (Y direction) together with capacitor 100 when electrode terminal 101 is disconnected from laminated bus bar 120 at connection portion 121.

[0081] When removing the capacitor 100 of the inverter 30 according to this embodiment in order to replace it with a new capacitor, the connection portion 121 of the laminated bus bar 120 is accessed through the penetration portion 131 of the AC bus bar 130, and the connection between the electrode terminal 101 and the laminated bus bar 120 at the connection portion 121 is released. Then, the tray member 140 together with the capacitor 100 is pulled out from the opening 153 in the second direction (Y direction). This allows the capacitor 100 to be removed from the receiving jig 146.

[0082] In the power conversion device (inverter 30) according to an embodiment of the present disclosure, the capacitor 100 placed on the tray member 140 can be inserted or removed from the second direction (Y direction) without removing the bus bar 110 from the inverter 30, and therefore the capacitor 100 arranged in the inverter 30 can be easily replaced. This in turn reduces the maintenance time of the power conversion device.

[0083] In a power conversion device (inverter 30) according to an embodiment of the present disclosure, when busbar 110 is configured from laminated busbar 120 and AC busbar 130, connection portion 121 with electrode terminal 101 of laminated busbar 120 can be accessed by through portion 131 provided in AC busbar 130 without removing AC busbar 130. This allows capacitor 100 to be inserted into and removed from housing 150 without removing busbar 110 from inverter 30, making it easy to replace capacitor 100 arranged in inverter 30.

[0084] In the power converter (inverter 30) according to an embodiment of the present disclosure, by providing the locking portion 154 on the housing 150, the movable tray member 140 can be reliably fixed to the housing 150.

[0085] In the power conversion device (inverter 30) according to an embodiment of the present disclosure, compared to when the bottom surface portion 151 of the housing 150 and the bottom plate portion 141 of the tray member 140 are fastened together by a fastening member, by arranging the fastening member 160 on the side surface of the tray member 140 and the housing 150, it is possible to prevent the fastening member 160 from protruding toward the bottom surface portion 151 of the housing. This makes it possible to prevent the fastening member 160 from interfering with the installation of the multiple inverters 30 when the multiple inverters 30 are arranged in layers.

[0086] In a power conversion device (inverter 30) according to one embodiment of the present disclosure, when capacitor 100 is considered to be a product with a limited lifespan, by providing opening 153 in housing 150 and providing tray member 140 to facilitate replacement of capacitor 100 arranged in inverter 30, a configuration can be achieved that takes into consideration the replaceability of capacitor 100 without reducing the performance of the power conversion device (reduction in the inductance value in the conversion circuit or increase in size of the device).

[0087] In the uninterruptible power supply 1 according to an embodiment of the present disclosure, a power conversion device (inverter 30) configured to allow easy replacement of the capacitor 100 can be applied to the uninterruptible power supply 1, and therefore, the maintenance time for the power conversion device can be reduced, thereby shortening the power outage time of the uninterruptible power supply 1. This allows the power supply reliability of the uninterruptible power supply 1 to be improved.

[0088] In the above-described embodiment, the power conversion device is described as an inverter, but since a converter can also have a structure similar to that of an inverter, the configuration of the present disclosure can also be applied to a converter.

[0089] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present disclosure should not be interpreted solely by the above-described embodiments. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. In the description of the above-described embodiments, combinable configurations may be combined with each other. [Explanation of symbols]

[0090] 1 uninterruptible power supply, 2 case body, 3, 3a, 3b, 3c power conversion unit, 10 commercial AC power supply, 11 load, 12 battery, 13 control device, 14, 15, 16, 17 DC line, 18 AC line, 20, 20R, 20S, 20T converter, 30, 30U, 30V, 30W, 930 inverter, 100 capacitor, 101 electrode terminal, 101n negative terminal, 101p positive terminal, 110 bus bar, 120 laminated bus bar, 121 connection portion, 130 AC bus bar, 131 penetration portion, 140 tray member, 141 bottom plate portion, 142 front plate portion, 143 grip portion, 144 side plate portion, 145 first penetration hole, 146, 953 receiving jig, 150, 950 Housing, 151,951 Bottom part, 152 Side part, 153 Opening part, 154 Locking part, 155 Second through hole, 160 Fastening member, 170 Cover member, 180 Gate drive board, AC1, AC2 AC terminal, BP2 Positive DC terminal (DC terminal), BN2 Negative DC terminal (DC terminal), BC2 Neutral DC terminal (DC terminal), C1 Collector terminal, C2E1, E2 Emitter terminal, PL DC positive bus (DC bus), NL DC negative bus (DC bus), CL DC neutral wire (DC bus), E1, E2, G1, G2 Control terminal, M1~M8 Semiconductor module, RL, SL, TL, UL, VL, WL Each phase line, VR, VS, VT, VU, VV, VW three-phase AC voltage.

Claims

1. a capacitor having an electrode terminal at an end in a first direction; a bus bar electrically connected to the electrode terminal and covering the capacitor from the first direction; a tray member on which the capacitor is placed; a housing that accommodates the capacitor and the tray member in a retractable manner, the housing has an opening facing a second direction perpendicular to the first direction, the tray member is insertable and removable together with the capacitor from the opening in the second direction when the connection between the electrode terminal and the bus bar is released, The bus bar is a plate-shaped laminate bus bar having a connection portion to be connected to the electrode terminal; a plate-shaped AC bus bar arranged to overlap the laminated bus bar on a side of the laminated bus bar opposite to a side on which the capacitor is located in the first direction, the AC bus bar has a through-portion formed at a position aligned with the connection portion in the first direction, the through-portion penetrating the AC bus bar in the first direction, the connection portion is accessible through the through portion from a side of the AC bus bar opposite to a side on which the laminated bus bar is located in the first direction.

2. the tray member includes a bottom plate portion on which the capacitor is placed, The power conversion device according to claim 1 , wherein the housing includes a bottom surface portion facing the bottom plate portion, and a locking portion provided on the bottom surface portion and locking the bottom plate portion together with the bottom surface portion.

3. 3. The power conversion device according to claim 1, wherein the tray member and the housing each have opposing surfaces that face each other in a third direction that is perpendicular to each of the first direction and the second direction, and the opposing surfaces are configured to be fastened to each other by a fastening member.

4. A plurality of power conversion devices according to claim 1 or 2; an uninterruptible power supply comprising: a case body that houses the plurality of power conversion devices so that the opening is located on the front side;

Images