Power conversion device

Abstract

To provide a power conversion device that can suppress the expansion of damage to peripheral components caused by deformation of conductors during a short-circuit fault with a simpler configuration.SOLUTION: The power conversion device includes a converter having a positive potential terminal and a negative potential terminal, performing at least one of converting DC power between the positive potential terminal and the negative potential terminal into another type of power, and converting another type of power into DC power, a first conductor electrically connected to the positive potential terminal, and a second conductor electrically connected to the negative potential terminal. At least one of the first conductor and the second conductor has a first portion, a second portion aligned with the first portion in the direction of a current flow, and a fuse section provided between the first portion and the second portion, configured to melt and disconnect the first portion from the second portion on the basis of a short-circuit current flowing through the first conductor and the second conductor when a short-circuit fault occurs in the converter that short-circuits between the positive potential terminal and the negative potential terminal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a power conversion device. [Background technology]

[0002] There is a power conversion device including a converter having a positive potential terminal and a negative potential terminal, and performing at least one of converting DC power between the positive potential terminal and the negative potential terminal into another power and converting the other power into DC power.

[0003] The power conversion device further includes a first plate-shaped conductor connected to the positive potential terminal and a second plate-shaped conductor connected to the negative potential terminal, the first conductor and the second conductor being used for at least one of supplying DC power to the converter and outputting DC power from the converter.

[0004] The second conductor is disposed opposite the first conductor with a predetermined gap therebetween, with the direction of current flowing through the second conductor being opposite to that of the first conductor. This makes it possible to suppress, for example, the inductance components of the first conductor and the second conductor. This makes it possible to suppress, for example, surge voltages that occur during operation of the converter.

[0005] In such a power conversion device, if a short-circuit fault occurs in the converter, causing a short circuit between the positive potential terminal and the negative potential terminal, a relatively large current flows through the first conductor and the second conductor, generating a magnetic repulsive force between the first conductor and the second conductor, which may cause deformation of the first conductor and the second conductor. There is also a concern that the deformed first conductor and the second conductor may come into contact with surrounding components, damaging the components.

[0006] For example, it is conceivable to suppress deformation of the first conductor and the second conductor when a short-circuit fault occurs by providing multiple holding members to hold the first conductor and the second conductor. However, because deformation of the first conductor and the second conductor due to magnetic repulsion occurs at unspecified positions on the first conductor and the second conductor, even if multiple holding members are provided as described above, deformation of the first conductor and the second conductor may occur at unexpected positions. Furthermore, attempting to appropriately suppress deformation of the first conductor and the second conductor may require a large number of holding members or a complex configuration of the multiple holding members, which may result in an increase in the number of parts of the power conversion device and an increase in manufacturing costs.

[0007] Therefore, it is desirable for a power conversion device to be able to suppress widespread failure of peripheral components due to deformation of conductors when a short-circuit fault occurs, with a simpler configuration. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Special Publication No. 02-013404 Summary of the Invention [Problem to be solved by the invention]

[0009] An embodiment of the present invention provides a power conversion device that can suppress, with a simpler configuration, widespread failure of peripheral components due to deformation of conductors when a short-circuit fault occurs. [Means for solving the problem]

[0010] According to an embodiment of the present invention, a converter includes a positive potential terminal and a negative potential terminal, and performs at least one of converting DC power between the positive potential terminal and the negative potential terminal into another power and converting the other power into the DC power, a first conductor electrically connected to the positive potential terminal, and a second conductor electrically connected to the negative potential terminal, wherein the first conductor and the second conductor are used for at least one of supplying the DC power to the converter and outputting the DC power from the converter, and the second conductor is configured to change the direction of a flowing current from the first conductor to the second conductor. a first conductor and a second conductor, the first conductor and the second conductor being arranged opposite to the first conductor with a predetermined gap therebetween and in a state opposite to the direction of current flowing through the conductor, and at least one of the first conductor and the second conductor having a first portion and a second portion aligned with the first portion in the direction of current flow, and a fusing portion arranged between the first portion and the second portion and configured to fuse the first portion and the second portion based on the short-circuit current flowing through the first conductor and the second conductor when a short-circuit fault occurs in the converter, causing a short circuit between the positive potential terminal and the negative potential terminal. [Effects of the Invention]

[0011] According to an embodiment of the present invention, a power conversion device is provided that can suppress, with a simpler configuration, widespread failure of peripheral components due to deformation of conductors when a short-circuit fault occurs. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a block diagram schematically illustrating a power conversion device according to an embodiment. [Figure 2] 1 is a perspective view schematically illustrating a portion of a power conversion device according to an embodiment. [Figure 3] FIG. 10 is a perspective view schematically illustrating a modification of a portion of the power conversion device according to the embodiment. [Figure 4] FIG. 10 is a perspective view schematically illustrating a modification of a portion of the power conversion device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Each embodiment will be described below with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between parts, etc. are not necessarily the same as those in reality. Furthermore, even when the same part is shown, the dimensions and ratios may be different depending on the drawing. In the present specification and the drawings, elements similar to those described above with reference to the previous drawings are designated by the same reference numerals, and detailed descriptions thereof will be omitted as appropriate.

[0014] FIG. 1 is a block diagram schematically illustrating a power conversion device according to an embodiment. As shown in FIG. 1, the power conversion device 10 includes a converter 12, a pair of charge storage elements 14 and 16, a first conductor 21, a second conductor 22, and a third conductor 23.

[0015] The converter 12 has a positive potential terminal 30a, a negative potential terminal 30b, a neutral terminal 30c, an AC terminal 31, four switching elements 32a to 32d, four first rectifying elements 33a to 33d, and two second rectifying elements 34a and 34b.

[0016] The converter 12 is connected to the DC circuit 2 via a positive potential terminal 30a and a negative potential terminal 30b. The positive potential terminal 30a is connected to a terminal 2a on the high potential side of the DC circuit 2. The negative potential terminal 30b is connected to a terminal 2b on the low potential side of the DC circuit 2. The DC circuit 2 is, for example, a DC power supply or a DC load.

[0017] The potential of the neutral terminal 30c is set to a potential intermediate between the potential of the positive potential terminal 30a and the potential of the negative potential terminal 30b, for example, to a potential that is substantially half the potential of the positive potential terminal 30a and the potential of the negative potential terminal 30b.

[0018] The pair of charge storage elements 14, 16 are provided between the positive potential terminal 30a and the negative potential terminal 30b. The capacitances of the pair of charge storage elements 14, 16 are substantially the same. The neutral terminal 30c is electrically connected to the connection point of the pair of charge storage elements 14, 16. This allows the potential of the neutral terminal 30c to be set to a potential that is substantially half the potential of the positive potential terminal 30a and the negative potential terminal 30b.

[0019] However, the method for setting the potential of the neutral terminal 30c is not limited to the above, and any method may be used that can appropriately set the potential to an intermediate potential between the potentials of the positive potential terminal 30a and the negative potential terminal 30b. Furthermore, the potential of the neutral terminal 30c is not limited to a potential that is exactly half the potential of the positive potential terminal 30a and the negative potential terminal 30b, and may include, for example, manufacturing errors due to variations in the capacitance of the charge storage elements 14, 16. The potential of the neutral terminal 30c may be set to an intermediate potential between the potentials of the positive potential terminal 30a and the negative potential terminal 30b, and may be any potential that allows the converter 12 to appropriately perform power conversion.

[0020] The four switching elements 32a to 32d are connected in series between the positive potential terminal 30a and the negative potential terminal 30b. Each of the switching elements 32a to 32d has a pair of main terminals and a control terminal. Each of the switching elements 32a to 32d has an on state and an off state. The on state is a state in which current flows between the pair of main terminals. The off state is a state in which current is blocked between the pair of main terminals. Each of the switching elements 32a to 32d switches between the on state and the off state depending on the voltage between the pair of main terminals and the voltage of the control terminal. Note that the off state is not limited to a state in which no current flows between the pair of main terminals, but may also be a state in which a weak current flows between the pair of main terminals within a range that does not affect the operation of the converter 12. Each of the switching elements 32a to 32d is a self-extinguishing element such as a GTO (Gate Turn Off Thyristor) or an IGBT (Insulated Gate Bipolar Transistor). The control terminal is, for example, a gate terminal.

[0021] The AC terminal 31 is connected to an AC circuit (not shown) and also to a connection point between the switching elements 32b and 32c. In other words, the AC terminal 31 is connected to a connection point between two high-side switching elements 32a and 32b and two low-side switching elements 32c and 32d among the four switching elements 32a to 32d. The AC circuit is, for example, an AC power supply or an AC load.

[0022] The four first rectifier elements 33a to 33d are connected in anti-parallel to the four switching elements 32a to 32d, respectively. More specifically, the four first rectifier elements 33a to 33d are connected in anti-parallel between a pair of main terminals of each of the four switching elements 32a to 32d. The direction of current flow in the first rectifier elements 33a to 33d is opposite to the direction of current flow between a pair of main terminals of each of the switching elements 32a to 32d. The first rectifier elements 33a to 33d are so-called freewheel diodes.

[0023] Of the two second rectifier elements 34a, 34b, the second rectifier element 34a is provided between the first connection point between the switching elements 32a and 32b and the neutral terminal 30c. In other words, the second rectifier element 34a is provided between the neutral terminal 30c and the first connection point between the two high-side switching elements 32a, 32b of the four switching elements 32a to 32d. The second rectifier element 34a rectifies the direction of the current flowing between the first connection point and the neutral terminal 30c in the direction from the neutral terminal 30c to the first connection point.

[0024] The other of the two second rectifier elements 34a, 34b, the second rectifier element 34b, is provided between the second connection point between the switching elements 32c and 32d and the neutral terminal 30c. In other words, the second rectifier element 34b is provided between the second connection point between the two low-side switching elements 32c and 32d of the four switching elements 32a to 32d and the neutral terminal 30c. The second rectifier element 34b rectifies the direction of the current flowing between the second connection point and the neutral terminal 30c in the direction from the second connection point to the neutral terminal 30c.

[0025] The potential of the first connection points of the two high-side switching elements 32a and 32b is clamped to the potential of the neutral terminal 30c via the second rectifier element 34a. Similarly, the potential of the second connection points of the two low-side switching elements 32c and 32d is clamped to the potential of the neutral terminal 30c via the second rectifier element 34b. In other words, the second rectifier element 34a sets the potential of the first connection points to the potential of the neutral terminal 30c. The second rectifier element 34b sets the potential of the second connection points to the potential of the neutral terminal 30c. The second rectifier elements 34a and 34b are so-called clamp diodes.

[0026] In the converter 12, the potential of the AC terminal 31 is set to one of three levels of potential: positive potential terminal 30a, negative potential terminal 30b, and neutral terminal 30c, depending on the switching of the four switching elements 32a to 32d.

[0027] Converter 12 converts DC power to AC power by switching four switching elements 32a to 32d. Converter 12 can also convert AC power to DC power by switching four switching elements 32a to 32d. Converter 12 is a so-called neutral-point-clamped (NPC) three-level converter.

[0028] 1 shows only one phase of the converter 12. For example, if the AC power of the AC circuit is single-phase AC power, the converter 12 has two phases connected in parallel. For example, if the AC power of the AC circuit is three-phase AC power, the converter 12 has three phases connected in parallel.

[0029] However, the configuration of the converter 12 is not limited to the above. The converter 12 may be, for example, a two-level converter. For example, the pair of charge storage elements 14, 16 and the third conductor 23 may be provided as needed and may be omitted. The power conversion by the converter 12 is not limited to conversion from DC power to AC power, but may also be conversion from DC power to another DC power. The converter 12 may have a positive potential terminal 30a and a negative potential terminal 30b and may have any configuration that converts DC power between the positive potential terminal 30a and the negative potential terminal 30b to another power or converts the another power to DC power. The another power may be any power different from the DC power between the positive potential terminal 30a and the negative potential terminal 30b (the DC power of the DC circuit 2).

[0030] The first conductor 21 is electrically connected to the positive potential terminal 30a of the converter 12. The first conductor 21 is used, for example, to connect the positive potential terminal 30a and the high potential terminal 2a of the DC circuit 2. The first conductor 21 may also be used, for example, to connect the positive potential terminal 30a and the high potential terminal of the charge storage element 14. The first conductor 21 may be any conductor that is electrically connected to the positive potential terminal 30a and through which at least a portion of the DC current flowing in the positive potential terminal 30a flows.

[0031] The second conductor 22 is electrically connected to the negative potential terminal 30b of the converter 12. The second conductor 22 is used, for example, to connect the negative potential terminal 30b and the low potential terminal 2b of the DC circuit 2. The second conductor 22 may also be used, for example, to connect the negative potential terminal 30b and the low potential terminal of the charge storage element 16. The second conductor 22 is electrically connected to the negative potential terminal 30b and may be any conductor through which at least a portion of the DC current flowing through the negative potential terminal 30b flows.

[0032] The first conductor 21 and the second conductor 22 are used for at least one of supplying DC power to the converter 12 and outputting DC power from the converter 12 .

[0033] The third conductor 23 is electrically connected to the neutral terminal 30c of the converter 12. The third conductor 23 is used to connect the neutral terminal 30c and the connection point of the pair of charge storage elements 14, 16, for example.

[0034] FIG. 2 is a perspective view that schematically illustrates a part of the power conversion device according to the embodiment. 2, the first conductor 21, the second conductor 22, and the third conductor 23 are plate-shaped. The first conductor 21, the second conductor 22, and the third conductor 23 may be called, for example, a bus bar.

[0035] The second conductor 22 is provided opposite the first conductor 21 at a predetermined distance, with the direction of the current flowing therethrough being opposite to the direction of the current flowing through the first conductor 21. For example, when the direction of the current flowing through the first conductor 21 is downward on the paper, as indicated by the arrow A1 in Fig. 2, the second conductor 22 is provided opposite the first conductor 21 so that the current flows upward on the paper, as indicated by the arrow A2 in Fig. 2.

[0036] This makes it possible to suppress, for example, the inductance components of the first conductor 21 and the second conductor 22. This makes it possible to suppress, for example, surge voltages that occur when the converter 12 is operating (when the switching elements 32a to 32d are switching). The distance between the first conductor 21 and the second conductor 22 is set as narrow as possible within a range that allows an appropriate insulation distance to be ensured. This makes it possible to more appropriately suppress, for example, the inductance components of the first conductor 21 and the second conductor 22.

[0037] The third conductor 23 is provided, for example, between the first conductor 21 and the second conductor 22. In other words, the third conductor 23 is provided opposite the first conductor 21 with a predetermined gap therebetween, and opposite the second conductor 22 with a predetermined gap therebetween.

[0038] The first conductor 21 has a first portion 41, a second portion 42, and a fusing portion 43. The second portion 42 is aligned with the first portion 41 in the direction of current flow. The fusing portion 43 is provided between the first portion 41 and the second portion 42. When a short-circuit fault occurs in the converter 12, causing a short circuit between the positive potential terminal 30a and the negative potential terminal 30b, the fusing portion 43 fuses the first portion 41 and the second portion 42 based on the short-circuit current flowing through the first conductor 21 and the second conductor 22.

[0039] The fusing portion 43 is, for example, a portion that is thinner than the first portion 41 and the second portion 42. The thickness of the fusing portion 43 is thinner than the thickness of the first portion 41 and thinner than the thickness of the second portion 42. In other words, the fusing portion 43 is a portion that has a groove portion that extends in a direction perpendicular to the direction of the current flowing through the first portion 41 and the second portion 42. In other words, the groove portion extends in the width direction of the first conductor 21 (the first portion 41 and the second portion 42).

[0040] This makes the resistance value of the fusing portion 43 greater than the resistance value of the first portion 41 and the resistance value of the second portion 42, and the temperature when a short-circuit current flows can be higher than the first portion 41 and the second portion 42. As a result, when a short-circuit current flows, the fusing portion 43 melts and the first portion 41 and the second portion 42 are melted. Then, by fusing the first portion 41 and the second portion 42, the short-circuit current flowing through the first conductor 21 and the second conductor 22 can be interrupted. The thickness of the fusing portion 43 may be set appropriately depending on the magnitude of the short-circuit current, the resistance value of the material, etc.

[0041] The extension direction of the groove of the fusing portion 43 is not limited to a direction strictly perpendicular to the direction of the current, as long as it has at least a component extending in the perpendicular direction. The extension direction of the groove may be inclined with respect to the perpendicular direction. The fusing portion 43 as described above can be formed, for example, by forming a groove by flanging. Furthermore, the shape of the groove is not limited to a shape extending linearly, but may be a curved shape, a serpentine shape, or a zigzag bent shape. The shape of the groove may be any shape that extends at least in the perpendicular direction.

[0042] 2, the power conversion device 10 further includes, for example, a pair of holding members 24 that hold the first conductor 21 and the second conductor 22 in an opposing state. In this example, the pair of holding members 24 hold the first conductor 21, the second conductor 22, and the third conductor 23 in an opposing state. The pair of holding members 24 are insulating. This makes it possible to prevent the first conductor 21 and the second conductor 22 from becoming electrically conductive via the pair of holding members 24.

[0043] The fusing portion 43 is disposed between a pair of holding members 24. In other words, one holding member 24 holds the first portion 41 of the first conductor 21, and the other holding member 24 holds the second portion 42 of the first conductor 21. This makes it possible to prevent the first portion 41 and the second portion 42 from being significantly deformed when the fusing portion 43 fuses the first portion 41 and the second portion 42 together.

[0044] The number of holding members 24 provided in the power conversion device 10 is not limited to two, and may be three or more. The fusing portion 43 may be disposed between any two of the plurality of holding members 24.

[0045] As described above, in the power conversion device 10 according to this embodiment, the first conductor 21 has the fusion portion 43. As a result, even when a short-circuit current flows through the first conductor 21 and the second conductor 22, the fusion portion 43 fuses the first portion 41 and the second portion 42, thereby preventing the first conductor 21 and the second conductor 22 from being significantly deformed by a repulsive force caused by a magnetic force. Therefore, it is possible to prevent the deformed first conductor 21 and the second conductor 22 from damaging surrounding components.

[0046] Furthermore, the deformation location of the first conductor 21 can be identified at the fusion portion 43. This makes it easier to take measures against deformation of the first conductor 21 and the second conductor 22 using the multiple holding members 24. This prevents the number of multiple holding members 24 from increasing and the configuration of the multiple holding members 24 from becoming complicated.

[0047] Furthermore, measures against deformation of the first conductor 21 and the second conductor 22 can be taken by the fusing portion 43 provided in the first conductor 21, and no additional members are required. Therefore, it is possible to suppress an increase in the number of parts of the power conversion device 10 and an increase in manufacturing costs, while suppressing widespread failure of peripheral parts due to deformation of the first conductor 21 and the second conductor 22.

[0048] In this way, in the power conversion device 10, it is possible to suppress, with a simpler configuration, widespread failure of peripheral components due to deformation of the first conductor 21 and the second conductor 22 when a short-circuit failure occurs.

[0049] Furthermore, as described above, when the fusing portion 43 is disposed between the pair of holding members 24, it is possible to more appropriately prevent the first portion 41 and the second portion 42 from being significantly deformed when the fusing portion 43 fuses the first portion 41 and the second portion 42. This makes it possible to more appropriately prevent the expansion of failures in the surrounding components.

[0050] In the above embodiment, the first portion 41, the second portion 42, and the fusing portion 43 are provided in the first conductor 21. The first portion 41, the second portion 42, and the fusing portion 43 are not limited to being provided in the first conductor 21, and may be provided in the second conductor 22. The first portion 41, the second portion 42, and the fusing portion 43 may be provided in each of the first conductor 21 and the second conductor 22. The first portion 41, the second portion 42, and the fusing portion 43 may be provided in at least one of the first conductor 21 and the second conductor 22.

[0051] FIG. 3 is a perspective view that schematically illustrates a modified example of a portion of the power conversion device according to the embodiment. 3, in this example, fusing portion 43 is replaced with fusing portion 44. Note that parts that are substantially the same in function and configuration as those in the above embodiment are given the same reference numerals, and detailed description thereof will be omitted.

[0052] The fusing portion 44 has a plurality of through holes 44a aligned in a direction perpendicular to the direction of the current flowing through the first portion 41 and the second portion 42. In other words, the plurality of through holes 44a are aligned in the width direction of the first conductor 21 (the first portion 41 and the second portion 42).

[0053] The direction in which the through holes 44a are arranged does not necessarily have to be strictly perpendicular to the direction of the current, as long as it has at least a component in the perpendicular direction. The direction in which the through holes 44a are arranged may be inclined with respect to the perpendicular direction. In addition, in this example, the through holes 44a are shown as being circular (round hole-shaped). However, the shape of the through holes 44a is not limited to this and may be any shape.

[0054] In this example, by arranging a plurality of through holes 44a side by side, the width of the conductive portion (portion through which current flows) of fusing portion 44 is made narrower than the width of the conductive portion of first portion 41 and the width of the conductive portion of second portion 42. In other words, fusing portion 44 is a portion where the width of the conductive portion is narrower than the first portion 41 and the second portion 42.

[0055] In this way, even when the width of the conductive portion is narrowed, similarly to the above embodiment, the resistance value of the fusing portion 44 can be made larger than the resistance value of the first portion 41 and the resistance value of the second portion 42, and the temperature when a short-circuit current flows can be made higher than the first portion 41 and the second portion 42. When a short-circuit current flows, the fusing portion 44 can be melted, and the first portion 41 and the second portion 42 can be melted.

[0056] In this way, the resistance of the fusing portion 44 can be adjusted not only by changing the thickness of the conductive portion but also by changing the width of the conductive portion. The fusing portion 44 may be, for example, a portion whose width is narrower than the first portion 41 and the second portion 42. The resistance of the fusing portion 44 may be adjusted, for example, by changing both the thickness and width of the conductive portion. The fusing portion 44 may be, for example, a portion whose thickness is thinner than the first portion 41 and the second portion 42 and whose width is narrower than the first portion 41 and the second portion 42 by providing a plurality of through holes 44a. The configuration of the fusing portion 44 is not limited to the above and may be any configuration that can appropriately fuse the first portion 41 and the second portion 42 based on a short-circuit current.

[0057] FIG. 4 is a perspective view that schematically illustrates a modified example of a portion of the power conversion device according to the embodiment. 4, in this example, the fusing portion 43 is replaced with a deforming portion 45. The deforming portion 45 is provided between the first portion 41 and the second portion 42. When a short-circuit fault occurs in the converter 12, causing a short circuit between the positive potential terminal 30a and the negative potential terminal 30b, the deforming portion 45 deforms based on a repulsive force caused by a magnetic force.

[0058] The deforming portion 45 is a portion that is made more easily deformable than the first portion 41 and the second portion 42, for example, by making the thickness thereof thinner than the first portion 41 and the second portion 42. The deforming portion 45 is disposed, for example, between the pair of holding members 24, similar to the fusing portions 43 and 44 in the above embodiment.

[0059] In this way, by providing the deforming portion 45, when a short-circuit current flows through the first conductor 21 and the second conductor 22, the deformation of the first conductor 21 and the second conductor 22 can be controlled by deforming the deforming portion 45. For example, by providing the deforming portion 45 at a position that has a low impact on surrounding components, it is possible to prevent the deformed first conductor 21 and second conductor 22 from damaging the surrounding components.

[0060] Furthermore, as in the above embodiment, the deformation location of the first conductor 21 can be identified at the deformation portion 45, which prevents the number of multiple holding members 24 from increasing and the configuration of the multiple holding members 24 from becoming complicated.

[0061] Furthermore, measures against deformation of the first conductor 21 and the second conductor 22 can be taken by the deforming portion 45 provided in the first conductor 21, and no additional members are required. Therefore, it is possible to suppress an increase in the number of parts of the power conversion device 10 and an increase in manufacturing costs, while suppressing widespread failure of peripheral parts due to deformation of the first conductor 21 and the second conductor 22.

[0062] Therefore, similar to the above embodiment, even when the deforming portion 45 is provided, it is possible to suppress, with a simpler configuration, widespread failure of surrounding components due to deformation of the first conductor 21 and the second conductor 22 when a short-circuit fault occurs. Note that, similar to the fusing portions 43 and 44 in the above embodiment, the deforming portion 45 may be provided on at least one of the first conductor 21 and the second conductor 22.

[0063] The deformation portion 45 has, for example, a first inclined portion 45a that is inclined so that the thickness continuously decreases from the first portion 41 to the second portion 42, and a second inclined portion 45b that is inclined so that the thickness continuously increases from the first inclined portion 45a to the second portion 42. In other words, the deformation portion 45 has a tapered notch shape. Such a deformation portion 45 can be formed, for example, by tapering using a machining center.

[0064] This allows stress to be concentrated at the boundary between the first inclined portion 45a and the second inclined portion 45b when a magnetic repulsive force is applied to the first conductor 21 in the event of a short-circuit fault in the converter 12, making it easier to deform the deforming portion 45. However, the shape of the deforming portion 45 is not limited to the above, and any shape may be used that allows appropriate deformation based on the magnetic repulsive force when a short-circuit fault occurs in the converter 12.

[0065] The present embodiment includes the following aspects. (Appendix 1) a converter having a positive potential terminal and a negative potential terminal, and performing at least one of converting DC power between the positive potential terminal and the negative potential terminal into another power and converting the other power into the DC power; a first conductor electrically connected to the positive potential terminal; a second conductor electrically connected to the negative potential terminal; Equipped with the first conductor and the second conductor are used for at least one of supplying the DC power to the converter and outputting the DC power from the converter, the second conductor is disposed opposite to the first conductor at a predetermined interval, with a direction of current flowing therethrough opposite to a direction of current flowing through the first conductor; At least one of the first conductor and the second conductor is The first part, a second portion aligned with the first portion in a direction of current flow; a fusing portion provided between the first portion and the second portion, the fusing portion fusing the first portion and the second portion based on a short-circuit current flowing through the first conductor and the second conductor when a short-circuit fault that short-circuits the positive potential terminal and the negative potential terminal occurs in the converter; A power conversion device having:

[0066] (Appendix 2) 2. The power conversion device according to claim 1, wherein the fusing portion is a portion having a thickness thinner than the first portion and the second portion.

[0067] (Appendix 3) 2. The power conversion device according to claim 1, wherein the fusing portion has a plurality of through holes aligned in a direction perpendicular to a direction of current flowing in the first portion and the second portion.

[0068] (Appendix 4) a pair of holding members that hold the first conductor and the second conductor in an opposing state; 4. The power converter according to claim 1, wherein the fusing portion is disposed between the pair of holding members.

[0069] (Appendix 5) a converter having a positive potential terminal and a negative potential terminal, and performing at least one of converting DC power between the positive potential terminal and the negative potential terminal into another power and converting the other power into the DC power; a first conductor electrically connected to the positive potential terminal; a second conductor electrically connected to the negative potential terminal; Equipped with the first conductor and the second conductor are used for at least one of supplying the DC power to the converter and outputting the DC power from the converter, the second conductor is disposed opposite to the first conductor at a predetermined interval, with a direction of current flowing therethrough being opposite to a direction of current flowing through the first conductor; At least one of the first conductor and the second conductor is The first part, a second portion aligned with the first portion in a direction of current flow; a deformation portion provided between the first portion and the second portion, the deformation portion being deformed based on a repulsive force caused by a magnetic force when a short-circuit fault that short-circuits the positive potential terminal and the negative potential terminal occurs in the converter; A power conversion device having:

[0070] (Appendix 6) The deformation portion is a first inclined portion that is inclined so that the thickness continuously decreases from the first portion toward the second portion; a second inclined portion that is inclined so that the thickness continuously increases from the first inclined portion toward the second portion; 6. The power conversion device according to claim 5,

[0071] (Appendix 7) a pair of holding members that hold the first conductor and the second conductor in an opposing state; 7. The power conversion device according to claim 5, wherein the deformation portion is disposed between the pair of holding members.

[0072] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0073] 2...DC circuit, 10...power conversion device, 12...converter, 14, 16...charge storage element, 21...first conductor, 22...second conductor, 23...third conductor, 24...holding member, 30a...positive potential terminal, 30b...negative potential terminal, 30c...neutral terminal, 31...AC terminal, 32a to 32d...switching elements, 33a to 33d...first rectifier element, 34a, 34b...second rectifier element, 41...first portion, 42...second portion, 43, 44...fusible portion, 44a...through hole, 45...deformed portion, 45a...first inclined portion, 45b...second inclined portion

Claims

1. a converter having a positive potential terminal and a negative potential terminal, and performing at least one of converting DC power between the positive potential terminal and the negative potential terminal into another power and converting the other power into the DC power; a first conductor electrically connected to the positive potential terminal; a second conductor electrically connected to the negative potential terminal; Equipped with the first conductor and the second conductor are used for at least one of supplying the DC power to the converter and outputting the DC power from the converter, the second conductor is provided opposite to the first conductor at a predetermined interval, with a direction of current flowing therethrough opposite to a direction of current flowing through the first conductor; At least one of the first conductor and the second conductor is A first part; and a second portion aligned with the first portion in a direction of current flow; a fusing portion provided between the first portion and the second portion, the fusing portion fusing the first portion and the second portion based on a short-circuit current flowing through the first conductor and the second conductor when a short-circuit fault that short-circuits the positive potential terminal and the negative potential terminal occurs in the converter; A power conversion device having:

2. The power conversion device according to claim 1 , wherein the fusing portion is a portion having a thickness thinner than the first portion and the second portion.

3. The power conversion device according to claim 1 , wherein the fusing portion has a plurality of through holes arranged in a direction perpendicular to the direction of the current flowing through the first portion and the second portion.

4. a pair of holding members that hold the first conductor and the second conductor in an opposing state; The power conversion device according to claim 1 , wherein the fusing portion is disposed between the pair of holding members.

5. a converter having a positive potential terminal and a negative potential terminal, and performing at least one of converting DC power between the positive potential terminal and the negative potential terminal into another power and converting the other power into the DC power; a first conductor electrically connected to the positive potential terminal; a second conductor electrically connected to the negative potential terminal; Equipped with the first conductor and the second conductor are used for at least one of supplying the DC power to the converter and outputting the DC power from the converter, the second conductor is provided opposite to the first conductor at a predetermined interval, with a direction of current flowing therethrough opposite to a direction of current flowing through the first conductor; At least one of the first conductor and the second conductor is A first part; and a second portion aligned with the first portion in a direction of current flow; a deformation portion provided between the first portion and the second portion, the deformation portion being deformed based on a repulsive force caused by a magnetic force when a short-circuit fault that short-circuits the positive potential terminal and the negative potential terminal occurs in the converter; A power conversion device having:

6. The deformation portion is a first inclined portion that is inclined so that the thickness continuously decreases from the first portion toward the second portion; a second inclined portion that is inclined so that the thickness continuously increases from the first inclined portion toward the second portion; 6. The power converter according to claim 5, further comprising:

7. a pair of holding members that hold the first conductor and the second conductor in an opposing state; The power conversion device according to claim 5 , wherein the deformation portion is disposed between the pair of holding members.

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