KR20060041625A - Power conversion device for rail vehicle - Google Patents

Abstract

An object of the present invention is to provide a power conversion device for a railway vehicle that can minimize the influence of the resonance current between the converter circuit and the inverter circuit and the filter capacitor, and can be miniaturized and reduced in weight.

The converter unit external connection terminal 20a of the direct current output is provided on the inverter unit 15 side on the back side of the converter unit 13, and the inverter unit on the converter unit 13 side on the back side of the inverter unit 15. An external connection terminal 20b is provided, and a DC link conductor 22 is connected between the converter unit external connection terminal 20a and the inverter unit external connection terminal 20b. As a result, the wiring inductance of the DC link portion can be reduced, and the size and weight of the power converter for railway vehicles can be reduced.

Railway vehicles, power converters, semiconductor devices

Description

Power conversion device for rolling stock {POWER CONVERSION DEVICE FOR RAIL VEHICLE}

1 is a block diagram of a power conversion device for a railway vehicle according to a first embodiment of the present invention.

2 is a block diagram of a power conversion device for a railway vehicle according to a second embodiment of the present invention.

3 is a block diagram of a power conversion device for a railway vehicle according to a third embodiment of the present invention.

4 is a configuration diagram of a power conversion device for a railway vehicle according to a fourth embodiment of the present invention.

5 is a configuration diagram of a power conversion device for a railway vehicle according to a fifth embodiment of the present invention.

6 is a block diagram of a conventional railway vehicle power converter.

* Description of the symbols for the main parts of the drawings *

11: power converter for rolling stock

12: converter circuit

13: converter unit

14: inverter circuit

15: inverter unit

16: device housing

17: semiconductor element

18: filter capacitor

19: terminal

20: unit external connection terminal

21: main circuit wiring conductor

22: DC link conductor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway vehicle electric power converter for use in an alternating current railroad car that is fed from an alternating current line.

The power conversion device for a railroad car is installed under the floor of a railroad car, and converts alternating current into direct current by the converter circuit, and converts direct current converted by the converter circuit into alternating current by the inverter circuit to power the motor driving power of the railroad vehicle. I am doing it.

FIG. 6 is a configuration diagram of a conventional railway vehicle power conversion device, FIG. 6A is a perspective view, FIG. 6B is a plan view, FIG. 6C is a side view, and FIG. 6D is a rear view. It is also. The railway vehicle power converter 11 is installed under the railway vehicle floor, and includes a converter unit 13 containing the converter circuit 12 and an inverter unit 15 containing the inverter circuit 14. Is formed by assembling. The converter unit 13 and the inverter unit 15 are assembled to the apparatus housing 16 so as to be attachable to and detach from under the vehicle floor from the side of the vehicle body (upward in FIG. 6A). Is maintained.

The converter circuit 12 converts alternating current into direct current by the switching operation of the plurality of semiconductor elements, and the inverter circuit 14 converts direct current converted by the converter circuit 12 into alternating current, each of the semiconductor element units. Has (17) In addition, the converter unit 13 and the inverter unit 15 each include a filter capacitor 18 connected by a DC link, and the filter capacitor 18 also serves as a surge absorption capacitor.

Here, the terminal portion 19 of the filter capacitor 18 is configured to face the semiconductor element portion 17, and the connection wiring between the semiconductor element portion 17 and the filter capacitor 18 of the converter circuit 12, And the connection wiring between the semiconductor element portion 17 and the filter capacitor 18 of the inverter circuit 14 can be shortened as much as possible.

In addition, since the converter unit 13 and the inverter unit 15 are mounted to the device housing 16 from the vehicle body side side, the electrical connection between the converter unit 13 and the inverter unit 15 and the device housing 16 is a converter. It is implemented in the back side of the unit 13 and the inverter unit 15. As shown in FIG.

That is, the unit external connection terminal 20 is provided in the back side of the converter unit 13 and the inverter unit 15, and is connected to the main circuit wiring conductor 21 or the DC link conductor 22. As shown in FIG. The main circuit wiring conductor 21 is arranged on the ceiling surface of the device housing 16 and is connected to the converter unit 13 and the inverter unit 15 by the conductor wiring from the ceiling surface, respectively. The wiring conductor 21 is bolted to the unit external connection terminal 20.

The circuit structure of the DC link portion is composed of the semiconductor element portion 17 of the converter unit 13 → the filter capacitor 18 of the converter unit 13 → the external connection terminal 20a of the converter unit 13 → the main circuit wiring conductor ( 21) an external connection terminal 20b of the inverter unit 15 → filter capacitor 18 of the inverter unit 15 → a semiconductor element portion 17 of the inverter unit 15, and the semiconductor element portion 17 By shortening the wiring between the filter capacitor 18 and the filter capacitor 18, it is difficult to shorten the wiring between the converter unit 13 and the inverter unit 15. The phenomenon in which the current between the converter unit 13 and the inverter unit 15 vibrates due to the inductance of the wiring of the portion of the DC link conductor 22 may occur, thereby reducing the cross-sectional area of the DC link conductor 22 or the like. It was necessary to reduce inductance by enlarging, thinning, or superimposing.

Carrier of the PWM inverter for railway vehicles, in order to prevent excessive heat generation in the wiring between the PWM inverter and the capacitor due to an increase in the average wiring length between the railway inverter PWM inverter and the capacitor and an increase in the impedance or an effective current mainly including high frequency components. In some cases, a series circuit comprising a reactor and a capacitor having a resonance frequency of 2F or more with respect to the frequency F is provided at both ends of the filter capacitor (see, for example, Japanese Unexamined Patent Application Publication No. 2002-135904).

However, Japanese Patent Laid-Open No. 2002-135904 newly requires a series circuit composed of a reactor and a capacitor. At present, miniaturization and weight reduction of the power conversion device for railroad cars used in AC railroad vehicles are being promoted. By arranging units and parts, the wiring between the semiconductor element portion 17 and the filter capacitor 18 can be shortened as much as possible. It is desired to suppress the resonance current between the filter capacitor 18 and the filter capacitor 18. In this case, when wiring size and surface area are enlarged in order to reduce the wiring inductance of this DC link part as much as possible, it becomes a structure contrary to the compactness and weight reduction of the power converter for railway vehicles finally.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power conversion device for a railway vehicle that can reduce the influence of the resonant current between the converter circuit and the inverter circuit and the filter capacitor as much as possible, and can be miniaturized and reduced in weight.

In the power conversion device for a railway vehicle of the present invention, a converter unit external connection terminal of direct current output is provided on the inverter unit side on the back side of the converter unit, and an inverter unit external connection terminal is provided on the converter unit side on the back side of the inverter unit. And a DC link conductor is connected between the converter unit external connection terminal and the inverter unit external connection terminal.

In addition, the converter unit external connection terminals are provided on the inverter unit side on the side of the converter unit instead of the back side of the converter unit, and the inverter unit external connection terminals are on the converter unit side on the side of the inverter unit instead of the back side of the inverter unit. It can also be installed on.

In addition, the filter capacitor may be disposed on one or both sides of the inverter unit side of the converter unit and the converter unit side of the inverter unit, and the DC link conductor may be shortened.

In addition, a filter capacitor is disposed between the converter unit and the inverter unit, and a converter unit external connection terminal of a DC output is provided on the inverter unit side on the side of the converter unit, and a DC input on the converter unit side on the side of the inverter unit. An inverter unit external connection terminal may be provided so as to connect between the converter unit external connection terminal and the inverter unit external connection terminal by a DC link conductor.

In addition, a filter capacitor is disposed on the back side of the converter unit and the inverter unit, and an external connection terminal of the converter unit of direct current output is provided on the inverter unit side of the back side of the converter unit, and a direct current is provided on the converter unit side of the back side of the inverter unit. An inverter unit external connection terminal of an input may be provided so as to connect between the converter unit external connection terminal and the inverter unit external connection terminal by a DC link conductor.

In addition, the converter unit external connection terminal, the inverter unit external connection terminal, and the terminal portion of the filter capacitor may be constituted by a one-touch connector in which insertion / extraction is performed simultaneously with the attachment / detachment operation to the device housing.

1 is a block diagram of a power conversion device for a railway vehicle according to a first embodiment of the present invention, Figure 1 (a) is a perspective view, Figure 1 (b) is a plan view, Figure 1 (c) is a side view, FIG. 1 (d) is a rear view. This first embodiment is a converter of direct current output for connecting to the terminal portion 19 of the filter capacitor 18 on the inverter unit 15 side on the rear side of the converter unit 13 in the conventional example shown in FIG. The unit external connection terminal 20a is provided, and the inverter unit external connection terminal 20b of direct current input for connecting to the filter capacitor 18 is provided on the converter unit 13 side on the rear side of the inverter unit 15, The converter unit external connection terminal 20a and the inverter unit external connection terminal 20b are connected by the DC link conductor 22. The same reference numerals are attached to the same elements as those in FIG. 6 to omit overlapping descriptions.

The filter unit 18 is built in the converter unit 13 and the inverter unit 15, respectively, and the converter unit 13 and the inverter unit 15 are arranged in the device housing 16 adjacent to each other. And the converter unit external connection terminal 20a of the DC output of the converter unit 13 is provided in the inverter unit 15 side of the back side of the converter unit 13. In FIG. 1, the case where three converter unit external connection terminals 20a are provided up and down is shown.

Similarly, the inverter unit external connection terminal 20b of the DC input of the inverter unit 15 is provided on the converter unit 13 side of the back side of the inverter unit 15, and in FIG. The case where the terminal 20b is provided is shown. The three converter unit external connection terminals 20a and the three inverter unit external connection terminals 20b are connected by the DC link conductors 22, respectively.

In this way, the converter unit 13 and the inverter unit 15 are disposed adjacent to each other in the device housing 16, and the external connection terminals 20a and 20b of direct current input / output are adjacent to each other. It is provided in the inside, and is electrically connected by the DC link conductor 22 between them. This shortens the wiring length of the DC link portion.

In addition, the external connection terminal 20a of the converter unit 13, the terminal portion 19 of the filter capacitor 18, the external connection terminal 20b of the inverter unit 15, and the terminal portion 19 of the filter capacitor 18 are provided. It is formed of a one-touch connector and has a structure in which the insertion / extraction of the connector is executed simultaneously with the attachment / detachment operation of the units 13 and 15 to the device housing 16. As a result, the work space between the units 13 and 15 becomes unnecessary, and the units 13 and 15 can be arranged in close proximity, and the wiring between the units 13 and 15 becomes shorter.

Here, the circuit structure of the DC link portion is the semiconductor element portion 17 of the converter unit 13 → the filter capacitor 18 of the converter unit 13 → the external connection terminal 20a of the converter unit 13 → the DC link conductor. (22) → the external connection terminal 20b of the inverter unit 15 → the filter capacitor 18 of the inverter unit 15 → the semiconductor element portion 17 of the inverter unit 15, and the units 13, 15 The current between) flows through this part, and the circuit of a DC link can be comprised suitably.

In the above description, the case where the filter capacitor 18 is built in both the converter unit 13 and the inverter unit 15 was demonstrated, but the filter capacitor 18 may be built in either one.

According to the first embodiment, since the unit external connection terminals 20a, 20b for direct current input / output are provided on the mutually adjacent sides on the rear side of the adjacent units 13, 15, the direct current link conductor of the direct current link portion ( The wiring length of 22) can be shortened and the wiring inductance can be reduced. Therefore, the miniaturization and weight reduction of the power conversion device for railway vehicles can be realized, and by miniaturizing each unit external connection terminal 20a, 20b, further miniaturization and light weight can be achieved, and maintenance property is also improved.

2 is a configuration diagram of a power conversion device for a railway vehicle according to a second embodiment of the present invention, Figure 2 (a) is a perspective view, Figure 2 (b) is a plan view, Figure 2 (c) is a side view, FIG. 2 (d) is a rear view. In the second embodiment, with respect to the first embodiment shown in FIG. 1, the converter unit external connection terminal 20a is connected to the converter unit 13 instead of the inverter unit 15 side on the rear side of the converter unit 13. It is provided on the side of the inverter unit 15 on the side, and the inverter unit external connection terminal 20b is a converter unit on the side of the inverter unit 15 instead of the converter unit 13 on the back side of the inverter unit 15. It is installed on the (13) side. The same reference numerals are attached to the same elements as in FIG. 1 to omit duplicate explanations.

In Fig. 2, the filter unit 18 is built in the converter unit 13 and the inverter unit 15, respectively, and the converter unit 13 and the inverter unit 15 are arranged in the device housing 16 adjacent to each other. do. The converter unit external connection terminal 20a of the DC output of the converter unit 13 is provided near the semiconductor element portion 17 of the converter circuit 12. That is, it is provided in the inverter unit 15 side at the side of the converter unit 13. In FIG. 2, the case where three converter unit external connection terminals 20a are provided up and down is shown.

Similarly, the inverter unit external connection terminal 20b of the DC input of the inverter unit 15 is provided in the vicinity of the semiconductor element portion 17 of the inverter circuit 14. That is, it is provided in the converter unit 13 side of the side of the inverter unit 15, and FIG. 2 has shown the case where three inverter unit external connection terminals 20b were provided in the upper and lower sides. These three converter unit external connection terminals 20a and three inverter unit external connection terminals 20b are connected by the DC link conductor 22, respectively.

In this way, the converter unit 13 with the filter capacitor 18 and the inverter unit 15 are disposed adjacent to each other in the device housing 16, and the external connection terminals 20a and 20b of DC input / output are adjacent to each other. It is provided in the side surface of the unit 13, 15 to make it, and it is set as the structure which electrically connected between them by the DC link conductor 22.

In addition, the external connection terminal 20a of the converter unit 13, the terminal portion 19 of the filter capacitor 18, the external connection terminal 20b of the inverter unit 15, and the terminal portion 19 of the filter capacitor 18 are provided. In the same manner as in the first embodiment, the connector is formed of a one-touch connector, and the insertion / extraction of the connector is performed simultaneously with the detachable operation of the units 13 and 15 to the device housing 16. It is a structure to be executed. As a result, the work space between the units 13 and 15 becomes unnecessary, and the units 13 and 15 can be arranged in close proximity, and the wiring between the units 13 and 15 becomes shorter.

According to the second embodiment, since the unit external connection terminals 20a, 20b for direct current input / output are provided on the adjacent sides of the side surfaces of the units 13, 15 adjacent to each other, similarly to the first embodiment, It becomes possible to shorten the wiring length of the DC link conductor 22 of a DC link part, and can reduce wiring inductance. Therefore, the size and weight reduction of the power conversion device for railway vehicles can be realized, and by miniaturizing each unit external connection terminal 20a, 20b, the size and weight can be further reduced, and the maintenance property is also improved.

3 is a configuration diagram of a power conversion device for a railway vehicle according to a third embodiment of the present invention, Figure 3 (a) is a perspective view, Figure 3 (b) is a plan view, Figure 3 (c) is a side view, Fig. 3 (d) is a rear view. In the third embodiment, with respect to the second embodiment shown in FIG. 2, the filter capacitor 18 of the converter unit 13 is connected to the inverter unit 15 side of the converter unit 13. The filter capacitor 18 is arranged on the converter unit 13 side of the inverter unit 15. The same reference numerals are attached to the same elements as those in FIG. 2 to omit duplicate explanations.

In FIG. 3, the filter unit 18 is built in the converter unit 13 and the inverter unit 15, respectively, and the filter capacitors 18 are arrange | positioned adjacent to each other by a vertical arrangement. The converter unit external connection terminal 20a of the DC output of the converter unit 13 is provided near the semiconductor element portion 17 of the converter circuit 12, and the inverter unit 15 side on the side of the converter unit 13 is provided. Installed in In FIG. 3, the case where three converter unit external connection terminals 20a are provided up and down is shown.

Similarly, the inverter unit external connection terminal 20b of the DC input of the inverter unit 15 is in the vicinity of the semiconductor element portion 17 of the inverter circuit 14 and on the side of the converter unit 13 on the side of the inverter unit 15. Is installed on. In FIG. 3, the case where three inverter unit external connection terminals 20b are provided up and down is shown. These three converter unit external connection terminals 20a and three inverter unit external connection terminals 20b are connected by the DC link conductor 22, respectively.

In this manner, the converter unit 13 and the inverter unit 15 in which the filter capacitor 18 is built by the vertical arrangement are arranged adjacent to each other in the device housing 16, and the external connection terminals 20a and 20b of DC input / output are provided. Are provided on the sides of the units 13 and 15 adjacent to each other, and the arrangement of the filter capacitors 18 in the converter unit 13 and the inverter unit 15 is also shown in the units adjacent to each other on the side of the units adjacent to each other. It is provided in the side surface, and it is set as the structure which electrically connected between the DC link conductor 22 between them.

According to the third embodiment, in addition to the effects of the second embodiment, the wiring between the filter capacitor 18 of the converter unit 13 and the filter capacitor 18 of the inverter unit 15 can also be shortened.

4 is a configuration diagram of a power conversion device for a railway vehicle according to a fourth embodiment of the present invention, Figure 4 (a) is a perspective view, Figure 4 (b) is a plan view, Figure 4 (c) is a side view, FIG. 4 (d) is a rear view. In the fourth embodiment, with respect to the second embodiment shown in Fig. 2, the filter capacitor 18 is provided outside the converter unit 13 and the inverter unit 15, and the filter capacitor 18 is connected to the converter unit ( The converter unit 13 and the inverter unit 15 are adjacent to each other so as to be positioned between the inverter unit 15 and the inverter unit 15, and are assembled to the apparatus housing 16 so as to be detachable from the side of the vehicle body under the vehicle floor. Inverter of direct current input for connecting the converter unit external connection terminal 20a of the direct current output for connection to 18) to the inverter unit 15 side on the side of the converter unit 13 and connecting to the filter capacitor 18. The unit external connection terminal 20b is installed on the side of the converter unit 13 on the side of the inverter unit 15, and the filter capacitor is connected between the converter unit external connection terminal 20a and the inverter unit external connection terminal 20b. Connection via DC link conductor 22 via One will. The same reference numerals are attached to the same elements as those in FIG. 2 to omit duplicate explanations.

In FIG. 4, the converter unit 13 and the inverter unit 15 are arranged in the device housing 16 so as to be adjacent to each other, and the filter capacitor 18 is installed outside the converter unit 13 and the inverter unit 15. It is. That is, the filter capacitor 18 is provided to be located between the converter unit 13 and the inverter unit 15. And the converter unit external connection terminal 20a of the DC output of the converter unit 13 is provided in the inverter unit 15 side of the side of the converter unit 13, and the inverter of the DC input of the inverter unit 15 similarly. The unit external connection terminal 20b is provided on the converter unit 13 side on the side of the inverter unit 15. The converter unit external connection terminal 20a is connected to the terminal portion 19 of the filter capacitor 18 via the DC link conductor 22, and the inverter unit external connection terminal 20b is similarly filtered through the DC link conductor 22. It is connected to the terminal portion 19 of the capacitor 18.

In this way, the converter unit 13, the inverter unit 15, and the filter capacitor 18 are arranged in the apparatus housing 16 so as to be adjacent to each other, and each direct current unit external connection terminals 20a and 20b are adjacent to each other. It is provided in the side surface of the unit 13, 15 which adjoins each other on the side of the unit 13, 15 to make, and the structure connected between them electrically by the DC link conductor 22.

According to the fourth embodiment, in addition to the effects of the second embodiment, since the filter capacitor 18 is disposed outside the units 13 and 15, the size and weight of the units 13 and 15 can be reduced. In addition, maintenance performance can be improved.

5 is a configuration diagram of a power conversion device for a railway vehicle according to a fifth embodiment of the present invention, Figure 5 (a) is a perspective view, Figure 5 (b) is a plan view, Figure 5 (c) is a side view, FIG. 5d is a rear view. In the fifth embodiment, with respect to the first embodiment shown in Fig. 1, the filter capacitor 18 is provided outside the converter unit 13 and the inverter unit 15, and the filter capacitor 18 is connected to the converter unit ( 13 and the converter unit 13 and the inverter unit 15 adjacent to each other so as to be located on the rear side of the inverter unit 15 so as to be assembled to the device housing 16 detachably under the vehicle floor from the side of the vehicle body. DC unit input for connecting the filter unit 18 with the converter unit external connection terminal 20a of the DC output for connection to the condenser 18 on the side of the inverter unit 15 on the side of the converter unit 13. The inverter unit external connection terminal 20b is provided on the converter unit 13 side on the rear side of the inverter unit 15, and a filter capacitor is connected between the converter unit external connection terminal 20a and the inverter unit external connection terminal 20b. By means of a direct current link conductor 22 via 18 It will have to fall. The same reference numerals are attached to the same elements as in FIG. 1 to omit duplicate explanations.

In FIG. 5, the converter unit 13 and the inverter unit 15 are arranged in the device housing 16 so as to be adjacent to each other, and the filter capacitor 18 is installed outside the converter unit 13 and the inverter unit 15. It is. That is, it is provided so that it may be located in the back side of the converter unit 13 and the inverter unit 15. As shown in FIG. And the converter unit external connection terminal 20a of the DC output of the converter unit 13 is provided in the inverter unit 15 side of the back side of the converter unit 13, and similarly the DC input of the inverter unit 15 The inverter unit external connection terminal 20b is provided on the converter unit 13 side on the rear side of the inverter unit 15. The converter unit external connection terminal 20a is connected to the terminal portion 19 of the filter capacitor 18 via the DC link conductor 22, and the inverter unit external connection terminal 20b is similarly filtered through the DC link conductor 22. It is connected to the terminal portion 19 of the capacitor 18.

In this way, the converter unit 13 and the inverter unit 15 are arranged in the apparatus housing 16 so as to be adjacent to each other, and the filter capacitor 18 is disposed on the back side of the converter unit 13 and the inverter unit 15. . That is, the converter unit 13, the filter capacitor 18, and the inverter unit 15 are arranged in a “co” shape, and the unit 13, in which the respective external connection terminals 20a and 20b of each direct current, are adjacent to each other, respectively. It is provided in the side surface of the unit 13 and 15 adjacent to each other on the 15) side, and it is set as the structure which electrically connected between them by the DC link conductor 22.

According to the fifth embodiment, in addition to the effects of the first embodiment, the units 13 and 15 can be downsized in the insertion direction, and maintenance performance can be improved.

According to the present invention, since the DC link conductor connected to the DC link portion can be shortened, the wiring inductance of the DC link portion can be reduced, and the size and weight of the power conversion device for a railway vehicle can be reduced. In addition, when the one-touch connector is used, electrical connection can be performed at the same time as the attachment / detachment operation to the device housing, so that the maintenance property of the converter unit and the inverter unit can be improved.

Claims (7)

A converter circuit installed under the floor of a railway vehicle and having a converter circuit for converting alternating current into direct current by switching operations of a plurality of semiconductor elements, and an inverter circuit for converting direct current converted by the converter circuit into alternating current In the power conversion device for rolling stock, A converter unit accommodating the converter circuit; An inverter unit accommodating the inverter circuit; A filter capacitor installed at one or both of the converter unit and the inverter unit and connected to a DC link; An apparatus housing in which the converter unit and the inverter unit are adjacent to each other so as to be detachably assembled and held under the vehicle floor from a vehicle body side; A converter unit external connection terminal of a DC output provided at the inverter unit side on the rear side of the converter unit and connected to the filter capacitor; An inverter unit external connection terminal of a DC input provided on the converter unit side on the rear side of the inverter unit and connected to the filter capacitor; And a DC link conductor for connecting between the converter unit external connection terminal and the inverter unit external connection terminal. The method of claim 1, The converter unit external connection terminal is provided on the inverter unit side on the side of the converter unit instead of the inverter unit side on the back side of the converter unit, and the inverter unit external connection terminal is located on the back side of the inverter unit. The power conversion device for railway vehicles, which is provided on the converter unit side on the side of the inverter unit instead of the converter unit side. The method of claim 1, And said filter capacitor is disposed on one or both sides of said inverter unit side of said converter unit and said converter unit side of said inverter unit. The method of claim 2, And said filter capacitor is disposed on one or both sides of said inverter unit side of said converter unit and said converter unit side of said inverter unit. In the power conversion device for railway vehicles, which is provided under the railroad car floor, and has a converter circuit for converting alternating current into direct current by switching operations of a plurality of semiconductor elements, and an inverter circuit for converting direct current converted by the converter circuit into alternating current. Got standing, A converter unit accommodating the converter circuit; An inverter unit accommodating the inverter circuit; A filter capacitor connected to the converter unit and the inverter unit by a direct current link, An apparatus housing detachably assembled and held under the vehicle floor from the side of the vehicle body by adjoining the converter unit and the inverter unit such that the filter capacitor is positioned between the converter unit and the inverter unit; A converter unit external connection terminal of a DC output provided on the inverter unit side on the side of the converter unit and connected to the filter capacitor; An inverter unit external connection terminal of a DC input provided at the converter unit side on the side of the inverter unit and connected to the filter capacitor; And a DC link conductor connecting the converter unit external connection terminal and the inverter unit external connection terminal via the filter capacitor. In the power conversion device for railway vehicles, which is provided under the railroad car floor, and has a converter circuit for converting alternating current into direct current by switching operations of a plurality of semiconductor elements, and an inverter circuit for converting direct current converted by the converter circuit into alternating current. In A converter unit accommodating the converter circuit; An inverter unit accommodating the inverter circuit; A filter capacitor connected to the converter unit and the inverter unit by a direct current link, An apparatus housing for attaching and detaching the converter unit and the inverter unit so that the filter capacitor is located on the rear side of the converter unit and the inverter unit so as to be detachably assembled under the vehicle floor from the side of the vehicle body; A converter unit external connection terminal of a DC output provided at the inverter unit side on the rear side of the converter unit and connected to the filter capacitor; An inverter unit external connection terminal of a DC input provided on the converter unit side on the rear side of the inverter unit and connected to the filter capacitor; And a DC link conductor for connecting between the converter unit external connection terminal and the inverter unit external connection terminal. The method according to any one of claims 1 to 6, The converter unit external connection terminal, the inverter unit external connection terminal and the terminal portion of the filter capacitor are one-touch type connectors which are inserted / extracted at the same time as the detachable operation to the device housing. Power conversion device for railway vehicles.

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