JP4525631B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device that converts power between AC power and DC power, or between DC power or between AC power.

  For example, in a hybrid vehicle having both an internal combustion engine and an electric motor as a drive source, and other vehicles having an electric motor as a drive source, a large-capacity inverter that performs bidirectional conversion between DC power and AC power is required. And Therefore, various power converters including this inverter have been developed.

  The power conversion apparatus controls a controlled current by using a plurality of semiconductor modules incorporating semiconductor elements such as IGBT elements. The semiconductor module has a main electrode terminal for taking in and out a controlled current, and the main electrode terminal is connected to a bus bar connected to a battery, an electric motor or the like. Then, the controlled current flows through the bus bar and the main electrode terminal and passes through the connection portion between them.

In such a power conversion device, there is disclosed a device in which a fuse is provided on a main electrode terminal in order to prevent an overcurrent from flowing through the semiconductor module and failing (see Patent Documents 1 and 2).
However, when an overcurrent flows, even if the main electrode terminal is physically disconnected in the fuse, if the disconnected terminal pieces are not sufficiently separated from each other, the state of being electrically connected by arc discharge may continue for a long time. There is. As a result, there is a risk that overcurrent will continue to flow through the semiconductor module and other components. And it may cause a failure of the semiconductor module or the like.

JP 2003-068967 A JP 2005-175439 A

  The present invention has been made in view of such conventional problems, and provides a power conversion device that can be quickly disconnected when an overcurrent flows to minimize a failure, and a vehicle equipped with the same. It is something to try.

1st invention is the power converter device which converts electric power between alternating current power and direct current power, or between direct current power or between alternating current power,
In the controlled current path controlled by the power converter, a connection portion is formed to connect the main electrode terminal protruding from the semiconductor module main body portion and the bus bar terminal of the bus bar ,
And the junction, the main electrode terminals and the bus bar terminal is superimposed so as to face the same direction, and the distal end portion of the tip portion and the bus bar terminal of the main electrode terminals are joined,
The main direction of the controlled current flowing through the main electrode terminal and the main direction of the controlled current flowing through the bus bar terminal are configured to be opposite to each other across the connecting portion, and the controlled current flows. Meanwhile, a repulsive force based on electromagnetic force acts between the front end portion of the main electrode terminal and the front end portion of the bus bar terminal .

Next, the effects of the present invention will be described.
In the present invention, the connection portion is overlapped so that the main electrode terminal protruding from the semiconductor module main body portion and the bus bar terminal face the same direction, and both are joined to each other at the tip portion. . Therefore, when an overcurrent flows through the connection portion, the tip portion can be melted.

What is important in the present invention is that the main direction of the controlled current flowing through the main electrode terminal and the main direction of the controlled current flowing through the bus bar terminal are opposite to each other across the connecting portion. In addition, while the controlled current is flowing, a repulsive force based on an electromagnetic force is acting between the distal end portion of the main electrode terminal and the distal end portion of the bus bar terminal.
That is, since the connecting portions are joined at the tip portions facing in the same direction, the main direction of the controlled current flowing through them is opposite (see FIG. 4) .
Therefore , a repulsive force based on electromagnetic force acts between the two terminals while the controlled current flows (see FIG. 5) .
Therefore , as described above, when the connection portion is blown by the overcurrent, the two terminals immediately move away from each other.

As a result, it is possible to prevent the current from continuing to flow between the two terminals sufficiently after the fusing. In addition, arc discharge can be prevented from occurring between the two terminals, and current continuation due to arc discharge can also be prevented.
Thereby, failure of the power converter due to overcurrent can be suppressed to a minimum.

  As described above, according to the present invention, it is possible to provide a power conversion device that can be disconnected at an early stage when an overcurrent flows to minimize a failure.

As a first reference invention , a power conversion device that converts power between AC power and DC power, or between DC power or between AC power,
A connection part between terminals of different parts is formed in the path of the controlled current controlled by the power converter,
At least one of the above-mentioned parts has three or more zigzag cut portions cut from the side surface in the width direction of the terminal, and a plurality of intermediate path portions formed between them are formed. Among them, there is a power conversion device configured such that main directions of the controlled currents flowing in adjacent intermediate path portions are opposite to each other .

Next, the effect of the first reference invention will be described.
Since the cut portion is formed in the terminal of at least one of the components, when an overcurrent flows through the terminal, the terminal can be blown on the extension line of the cut portion.
And, since the main direction of the controlled current flowing through the adjacent intermediate path portions is configured to be opposite, the electromagnetic force is applied between the adjacent intermediate path portions while the controlled current flows. Repulsive force based on Therefore, as described above, when the terminal is melted by an overcurrent, the two intermediate path portions immediately move away from each other.

As a result, it is possible to prevent the current from continuing to flow between the two intermediate path portions sufficiently after the fusing. Moreover, it is possible to prevent arc discharge from occurring between the two intermediate path portions, and it is also possible to prevent current continuation due to arc discharge.
Thereby, failure of the power converter due to overcurrent can be suppressed to a minimum.

As described above, according to the first reference invention , it is possible to provide a power converter that can be disconnected at an early stage when an overcurrent flows to suppress a failure to a minimum.

Moreover, as a second reference invention , a power conversion device that converts power between AC power and DC power, or between DC power or between AC power,
A connection part between terminals of different parts is formed in the path of the controlled current controlled by the power converter,
The terminal of at least one of the above components is formed with a bent portion that is bent so as to form a pair of parallel path portions that are substantially parallel to each other, and the folded top portion of the bent portion has a width direction. The slit part cut from the side of is formed,
There is a power conversion device configured such that main directions of the controlled currents flowing in the pair of parallel path portions in the bent portion are opposite to each other .

Next, the function and effect of the second reference invention will be described.
Since the slit portion is formed in the terminal of at least one of the components, when an overcurrent flows through the terminal, the terminal can be blown on the extension line of the slit portion.
The terminal is formed with the bent portion having a pair of parallel path portions, and the main direction of the controlled current flowing through the pair of parallel path portions is reversed. Therefore, a repulsive force based on an electromagnetic force acts between the pair of parallel path portions while a controlled current flows. Therefore, as described above, when the folded top portion of the bent portion is melted by overcurrent, the two parallel path portions immediately move away from each other.

As a result, it is possible to prevent the current from continuing to flow between the two parallel path portions sufficiently after the fusing. Further, it is possible to prevent arc discharge from occurring between the two melted parallel path portions, and it is possible to prevent current continuation due to arc discharge.
Thereby, failure of the power converter due to overcurrent can be suppressed to a minimum.

As described above, according to the second reference invention , it is possible to provide a power conversion device that can be disconnected at an early stage when an overcurrent flows to minimize a failure.

A second invention is a vehicle that uses an electric motor as a drive source, and is equipped with a power conversion device for generating drive power for the electric motor, the power conversion device according to claims 1 to 8 . The power conversion device according to any one of claims 1 to 6 is provided in a vehicle (claim 9 ).
ADVANTAGE OF THE INVENTION According to this invention, when an overcurrent flows, the vehicle carrying the power converter device which can be disconnected early and can suppress failure to the minimum can be provided.

  In the first invention (invention 1), examples of the power converter include a DC-DC converter and an inverter. Moreover, the said power converter device can be used for the production | generation of the drive current which supplies with electricity to the alternating current motor which is power sources, such as an electric vehicle and a hybrid vehicle, for example.

Further, the connecting portion includes a main electrode terminal of the semiconductor module with a built-in semiconductor element, Ru connecting portion der of the bus bar terminals of the bus bar to be connected to the main electrode terminal.
Then, disconnected prematurely when the overcurrent flows to the connection portion, minimize the failure of the semiconductor module.
The semiconductor module includes a semiconductor element such as an IGBT element.

Further, the terminal constituting the connection portion is preferably the cross-sectional area of the distal end portion is smaller than the cross-sectional area of the other portion (claim 2).
In this case, since the cross-sectional area of the tip portion serving as the joint portion is small, the resistance value of this portion increases. Therefore, when an overcurrent flows, the Joule heat at the joint (tip portion) can be made larger than that at other portions, and it can be surely blown at the joint. Thereby, the fusing part at the time of overcurrent passage can be made constant, and early and reliable disconnection after fusing can be realized.

Moreover, the two parts of the terminal preferably has a different thickness from each other (claim 3).
In this case, when a repulsive force acts in a direction in which the two terminals are separated after the connection portion is melted, the terminal having the smaller thickness is bent, so that the continuation of the current can be reliably prevented. And since the bending direction of the terminal after fusing is constant, the component arrangement in the power conversion device can be appropriately designed in advance. That is, appropriate component arrangement can be performed so as to prevent a short-circuit failure between the terminal and other components after fusing.

Moreover, it is preferable that the said connection part is welded (Claim 4 ).
In this case, the connection part can be easily formed.
Welding can be performed by an arc welding method such as TIG.

Moreover, it is preferable that the said connection part is making the front-end | tip part into a curved-surface shape (Claim 5 ).
In this case, it is possible to effectively suppress the occurrence of arc discharge when the connecting portion is melted.

Further, the connection portion, it is preferable that the radius of curvature 20mm or more curved tip portion (claim 6).
In this case, it is possible to more effectively suppress the occurrence of arc discharge when the connecting portion is melted.

The connecting portion may be fastened by rivets (claim 7 ).
In this case, the rivet can be melted when passing overcurrent, and the melted part can be stabilized.

Also, among the terminals constituting the connection unit, at least one, preferably made of plated layer made of a high resistance than the base metal formed on the surface (claim 8).
In this case, since the temperature of the plating layer having a high resistance value is particularly high when the overcurrent is passed, the plating layer can be melted and the melted portion can be further stabilized.
For example, when copper (Cu) is employed as the base material, nickel (Ni), gold (Au), or the like can be used as the plating layer.

Next, in the first reference invention , between the adjacent intermediate path portions and between the front end portion of the cut portion cut from one side surface of the terminal and the other side surface of the terminal. The distance is appropriately determined according to the flowing current and the width and thickness of the conductor.

Next, in the second reference invention , the width of the folded top portion excluding the slit portion in the folded portion is appropriately determined according to the flowing current and the thickness of the conductor.

Example 1
A power converter according to an embodiment of the present invention will be described with reference to FIGS.
The power conversion apparatus 1 of this example is an inverter that converts power between DC power and AC power, and a connection part 4 between different parts in a controlled current path controlled by the power conversion apparatus 1. Is formed. Specifically, as shown in FIGS. 1 to 3, the connecting portion 4 is a connecting portion between the main electrode terminal 21 of the semiconductor module 2 incorporating the semiconductor element and the bus bar 3 connected to the main electrode terminal 21. It is.

As shown in FIG. 2 and FIG. 3, the connection portion 4 overlaps the main electrode terminal 21 of the semiconductor module 2 and the terminal (bus bar terminal 31) of the bus bar 3 so that the tip portions 211 and 311 face in the same direction. Together with the tip portions 211 and 311.
4, the main direction of the controlled current I flowing through the terminals of the two components, that is, the main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 is reversed. ing.

As shown in FIG. 2, the main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 constituting the connection portion 4 have smaller cross-sectional areas of the tip portions 211 and 311 than the cross-sectional areas of other portions. In this example, the tip portions 211 and 311 have a substantially trapezoidal shape.
The main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 have different thicknesses. The thickness of the main electrode terminal 21 is made smaller than the thickness of the bus bar terminal 31. Specifically, the thickness of the main electrode terminal 21 is 1 mm, and the thickness of the bus bar terminal 31 is 5 mm. The widths of the main electrode terminal 21 and the bus bar terminal 31 are both 10 mm, and the widths of the tip portions 211 and 311 are 2 mm.
The main electrode terminal 21 and the bus bar 3 of the semiconductor module 2 are both made of copper.

As shown in FIGS. 2 and 3, the connecting portion 4 is welded. That is, the welded portion 40 is formed at the tip portions 211 and 311 of the main electrode terminal 21 and the bus bar terminal 31. Welding can be performed by an arc welding method such as TIG.
The tip of the connecting portion 4, that is, the welded portion 40 has a curved surface shape with a curvature radius of 20 mm or more.

The semiconductor module 2 includes a module main body 20 containing a semiconductor element such as an IGBT, two main electrode terminals 21 protruding from the module main body 20, and a protruding direction of the main electrode terminal 21 of approximately 180 degrees. The signal terminal 22 protrudes in the direction.
The two main electrode terminals 21 are connected to the bus bar terminals 31 of the bus bar 3, respectively.

  Further, as shown in FIGS. 1 and 6, the power conversion device 1 is configured using a plurality of semiconductor modules 2, and the main current is input / output to / from the semiconductor module 2 from the main electrode terminal 21. The bus bar 3 is connected to the electrode terminal 21. The bus bar 3 connected to one main electrode terminal 21 in each semiconductor module 2 is connected to the electric motor 11, and the bus bar 3 connected to the other main electrode terminal is connected to the power supply (not shown) side. ing.

The signal terminal 22 of the semiconductor module 2 is connected to a control circuit (not shown) that controls the switching operation of the semiconductor module 2.
Then, by the switching operation of each semiconductor module 2, the DC power supplied from the power supply side can be converted into AC power, and the electric motor 11 can be driven.
Moreover, the said power converter device 1 can be mounted in vehicles, such as an electric vehicle and a hybrid vehicle, which utilize the said electric motor 11 as a drive source.

Next, the function and effect of this example will be described.
The connecting portion 4 is configured such that the main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 are overlapped so that the tip portions 211 and 311 face in the same direction, and are joined at the tip portions 211 and 311. ing. Therefore, when an overcurrent flows through the connection portion 4, the tip portion 4 can be melted.

  As shown in FIGS. 4 and 5, the main direction of the controlled current I flowing through the main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 is reversed. That is, since the connecting portion 4 is joined at the tip portions 211 and 311 facing in the same direction, the main direction of the controlled current I flowing therethrough is opposite. In addition, the main electrode terminal 21 and the bus bar terminal 31 may be in contact with each other at the welded portion 40 at the tip, but since the contact resistance increases at these contact portions, the main flow of the controlled current I is the tip. Part (welded part 40). The direction of the main flow of the controlled current is the “main direction”.

  Thus, the main direction of the controlled current I flowing through the main electrode terminal 21 and the bus bar terminal 31 is opposite, so that the controlled current I is between the two terminals (the main electrode terminal 21 and the bus bar terminal 31). Is flowing, repulsive force F based on electromagnetic force is acting. That is, as shown in FIG. 5, when currents I in opposite directions flow through the main electrode terminal 21 and the bus bar terminal 31, magnetic fields B in opposite directions are generated around each terminal. This reverse magnetic field B generates a repulsive force F based on the electromagnetic force.

Therefore, as described above, when the connecting portion 4 is melted by an overcurrent, the main electrode terminal 21 and the bus bar terminal 31 immediately move away from each other. As a result, after the fusing, as shown in FIG. 7, the main electrode terminal 21 and the bus bar terminal 31 can be sufficiently separated from each other to prevent the current from continuing to flow between them. Further, it is possible to prevent arc discharge from occurring between the main electrode terminal 21 and the bus bar terminal 31, and it is also possible to prevent current continuation due to arc discharge.
Thereby, the failure of the power converter device 1 due to overcurrent can be suppressed to a minimum.

  In addition, the main electrode terminal 21 and the bus bar terminal 31 constituting the connection portion 4 have the cross-sectional areas of the tip portions 211 and 311 smaller than the cross-sectional areas of the other portions. That is, since the cross-sectional areas of the tip portions 211 and 311 serving as the joint portion (welded portion 40) are small, the resistance value of this portion becomes large. Therefore, when an overcurrent flows, the Joule heat in the welded portion 40 (tip portions 211, 311) can be made larger than that in other portions, and the welded portion 40 can be surely blown. Thereby, the fusing part at the time of overcurrent passage can be made constant, and early and reliable disconnection after fusing can be realized.

  The main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 have different thicknesses, and the thickness of the main electrode terminal 21 is smaller than the thickness of the bus bar terminal 31. As a result, as shown in FIG. 7, when the repulsive force acts in the direction in which the two terminals are separated after the connection part 4 is melted, the main electrode terminal 21, which is the thinner terminal, is bent, thereby continuing the current. Can be reliably prevented. And since the bending direction of the terminal after fusing is fixed, the component arrangement in the power conversion device 1 can be appropriately designed in advance. That is, appropriate component arrangement can be performed so as to prevent a short-circuit failure between the terminal and other components after fusing.

  Moreover, since the front-end | tip part (welding part 40) of the said connection part 4 is a curved surface shape, generation | occurrence | production of the arc discharge at the time of the said connection part 4 fusing can be suppressed effectively. In particular, since the curved surface shape of the welded portion 40 has a radius of curvature of 20 mm or more, the occurrence of arc discharge when the connecting portion 4 is melted can be more effectively suppressed.

  As described above, according to the present example, it is possible to provide a power conversion device that can be disconnected early when an overcurrent flows to suppress a failure to a minimum, and a vehicle equipped with the power conversion device.

(Example 2)
In this example, a plating layer made of a metal having a resistance value higher than that of the base material is formed on at least one of the main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 constituting the connection portion 4. This is an example.
That is, when copper (Cu) is employed as the base material, nickel (Ni), gold (Au), or the like can be used as the plating layer.
Others are the same as in the first embodiment.

In the case of this example, the temperature of the plating layer having a high resistance value is particularly high when the overcurrent is passed, so that the plating layer can be melted and the melted portion can be made more stable.
In addition, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, as shown in FIG. 8, the connecting portion 4 between the main electrode terminal 21 of the semiconductor module 2 and the bus bar terminal 31 of the bus bar 3 is fastened by a rivet 41.
That is, an opening is provided in the tip 211 of the main electrode terminal 21 and the tip 311 of the bus bar terminal 31, the bus bar terminals 31 are overlapped so that the openings are aligned, and the rivet 41 is inserted through the opening. And conclude. In addition, as a material of the rivet 41, iron or copper can be used.
Others are the same as in the first embodiment.

In the case of this example, the rivet 41 can be melted when overcurrent is passed, and the melted portion can be stabilized.
In addition, the same effects as those of the first embodiment are obtained.

Example 4
In this example, as shown in FIG. 9, the main electrode terminal 21 of the semiconductor module 2 is formed in three staggered cut portions 212 cut from the side surface in the width direction of the main electrode terminal 21. .
The main directions of the controlled currents flowing through the two intermediate path portions 213 formed between the three cut portions 212 are opposite to each other.

Further, a distance W1 between the two intermediate path portions 213 and the front end portion of the cut portion 212 cut from one side surface of the main electrode terminal 21 and the other side surface of the main electrode terminal 21. Is appropriately determined according to the flowing current and the length and thickness of the conductor.
Further, the cut portion 212 is formed in a direction perpendicular to the length direction of the main electrode terminal 21. And the formation interval L1 of the notch part 212 is suitably determined according to the flowing current and the width and thickness of the conductor.

In this example, the state of the connecting portion 4 between the main electrode terminal 21 and the bus bar terminal 31 of the semiconductor module 2 is the same between the tip portions 211 and 311 as in the first embodiment (FIGS. 2 and 3). It is not always necessary to face the direction.
Others are the same as in the first embodiment.

Next, the function and effect of this example will be described.
Since the cut portion 212 is formed in the main electrode terminal 21 of the semiconductor module 2, the main electrode terminal 21 can be melted on the extension line of the cut portion 212 when an overcurrent flows through the main electrode terminal 21. it can.
And since it is comprised so that the main direction of the controlled current I which flows through the adjacent intermediate path part 213 may become reverse, between the adjacent intermediate path parts 213, while the controlled current I is flowing, electromagnetic Repulsive force based on force is acting. Therefore, as described above, when the main electrode terminal 21 is melted by an overcurrent, the two intermediate path portions 213 immediately move away from each other.

As a result, it is possible to prevent the current from continuing to flow between the two intermediate path portions 213 sufficiently after the fusing. Moreover, it is possible to prevent arc discharge from occurring between the two main electrode terminals 21, and it is possible to prevent current continuation due to arc discharge.
Thereby, the failure of the power converter device 1 due to overcurrent can be suppressed to a minimum.

As described above, according to the present example, it is possible to provide a power conversion device that can be disconnected at an early stage when an overcurrent flows to suppress a failure to a minimum.
In addition, the same effects as those of the first embodiment are obtained.

(Example 5)
In this example, as shown in FIGS. 10 and 11, the main electrode terminal 21 of the semiconductor module 2 is formed with a bent portion 215 that is bent so that a pair of parallel path portions 214 that are substantially parallel to each other are formed. It is an example.
A slit portion 217 cut from the side surface in the width direction is formed on the folded top portion 216 of the bent portion 215.
The main directions of the controlled current I flowing through the pair of parallel path portions 214 in the bent portion 215 are opposite to each other.

The bent portion 215 is bent so as to protrude substantially perpendicular to the longitudinal direction of the main electrode terminal 21, and the protrusion amount L2 is appropriately determined according to the flowing current, the width and thickness of the conductor. .
The slit portion 217 is formed from both side surfaces of the folded top portion 216, and the distance W2 between the pair of slit portions 217 is appropriately determined according to the flowing current and the width and thickness of the conductor.
Furthermore, the distance L3 between the pair of parallel path portions 214 is also appropriately determined according to the flowing current and the width, thickness, and length of the conductor.
Others are the same as in the first embodiment.

Next, the function and effect of this example will be described.
Since the slit portion 217 is formed in the main electrode terminal 21 of the semiconductor module 2, the main electrode terminal 21 can be melted on the extension line of the slit portion 217 when an overcurrent flows through the main electrode terminal 21. it can.
The main electrode terminal 21 is formed with a bent portion 215 having a pair of parallel path portions 214 so that the main direction of the controlled current I flowing through the pair of parallel path portions 214 is reversed. . Therefore, a repulsive force based on an electromagnetic force acts between the pair of parallel path portions 214 while the controlled current I flows. Therefore, as described above, when the folded top portion 216 of the bent portion 215 is melted by an overcurrent, the two parallel path portions 214 immediately move away from each other.

As a result, it is possible to prevent the current from continuing to flow between the two parallel path portions 214 sufficiently after the fusing. Further, it is possible to prevent arc discharge from occurring between the two melted parallel path portions 214, and it is possible to prevent current continuation due to arc discharge.
Thereby, the failure of the power converter device 1 due to overcurrent can be suppressed to a minimum.

As described above, according to the present example, it is possible to provide a power conversion device that can be disconnected at an early stage when an overcurrent flows to suppress a failure to a minimum.
In addition, the same effects as those of the first embodiment are obtained.

In the said Example 4, 5, the notch part 212 and the bending part 215 are provided in the main electrode terminal 21 of the semiconductor module 2, but depending on the case, these are the bus bar terminals 31 (refer FIG. 2, FIG. 3). ).
In each of the above embodiments, the structure of the connection portion between the semiconductor module and the bus bar has been described. However, the configuration of the present invention is applied not only to these connection portions but also to other connection portions in the power conversion device. I can.

The perspective view explaining a part of power converter device in Example 1. FIG. FIG. 3 is a perspective view of a semiconductor module and a bus bar in the first embodiment. The side view of the semiconductor module and bus bar in Example 1. FIG. FIG. 3 is an explanatory diagram illustrating a flow of a controlled current in a connection portion in the first embodiment. Explanatory drawing of the repulsive force based on the electromagnetic force which acts on a connection part in Example 1. FIG. FIG. 3 is a circuit explanatory diagram of the power conversion device according to the first embodiment. Side surface explanatory drawing at the time of a disconnection with the main electrode terminal of a semiconductor module, and the terminal of a bus bar in Example 1. FIG. The side view of the semiconductor module in Example 3, and a bus bar. The front view with the main electrode terminal of the semiconductor module in Example 4. FIG. FIG. 10 is a perspective view of a main electrode terminal of a semiconductor module in Example 5. FIG. 11 is a cross-sectional view taken along line AA in FIG. 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power converter 2 Semiconductor module 21 Main electrode terminal 211 Tip part 3 Bus bar 31 Bus bar terminal 311 Tip part 4 Connection part 40 Welding part

Claims (9)

A power conversion device that converts power between AC power and DC power, or between DC power or AC power,
In the controlled current path controlled by the power converter, a connection portion is formed to connect the main electrode terminal protruding from the semiconductor module main body portion and the bus bar terminal of the bus bar ,
And the junction, the main electrode terminals and the bus bar terminal is superimposed so as to face the same direction, and the distal end portion of the tip portion and the bus bar terminal of the main electrode terminals are joined,
The main direction of the controlled current flowing through the main electrode terminal and the main direction of the controlled current flowing through the bus bar terminal are configured to be opposite to each other across the connecting portion, and the controlled current flows. In the meantime, a repulsive force based on electromagnetic force is acting between the tip of the main electrode terminal and the tip of the bus bar terminal . 2. The power conversion device according to claim 1, wherein the terminal constituting the connection portion has a cross-sectional area of a tip portion smaller than a cross-sectional area of another portion . 3. The power conversion device according to claim 1, wherein the terminals of the two components have different thicknesses . The power converter according to claim 1, wherein the connection portion is welded . 5. The power conversion device according to claim 4, wherein the connecting portion has a curved end shape . 6. The power conversion device according to claim 5, wherein the connection portion has a tip portion with a curved shape having a curvature radius of 20 mm or more . The power conversion device according to claim 1, wherein the connection portion is fastened by a rivet . 8. The terminal according to claim 1, wherein at least one of the terminals constituting the connection portion is formed with a plating layer made of a metal having a resistance value higher than that of a base material on the surface. A power converter. A vehicle that uses an electric motor as a drive source, and is equipped with a power conversion device for generating drive power for the electric motor, the power conversion device according to any one of claims 1 to 8. A vehicle characterized by being a power conversion device .

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