The present invention relates to a power conversion device and an electric railroad vehicle equipped with the power conversion device.
A power conversion device used to control a motor for driving a vehicle such as an electric railroad vehicle is installed under the floor of the vehicle. However, it is necessary to mount many parts such as, for example, a power supply for air conditioning, in addition to the power conversion device, under the floor of the vehicle, and thus the power conversion device is required to be downsized.
On the other hand, in order to improve efficiency and to respond to installation environments, various circuits as shown below exist, and downsizing of each circuit has been attempted.
In a technique disclosed in Patent Literature 1, in order to reduce a loss caused by winding resistance by reducing a motor current while boosting a voltage applied to the motor, when a boosting circuit is provided in a power conversion device for a railroad vehicle, the size of equipment is prevented from increasing due to the boosting circuit.
In a technique disclosed in Patent Literature 2, even in the case where a capacitor voltage is raised due to a contact loss of a pantograph and a sudden change in load when a regenerative brake is applied, reliability can be improved by installing an overvoltage suppression circuit to prevent an overvoltage to a semiconductor element in a power conversion device.
In a technique disclosed in Patent Literature 3, a reactor and a brake resistor necessary for a brake chopper device that reduces wear of an air brake to obtain brake force by converting electric power generated by a motor into heat by the brake resistor are shared with other devices to realize downsizing by reducing the number of parts of necessary devices and to reduce a failure risk.
[Patent Literature 1] Japanese Unexamined Patent Application Publication No. 2015-133779
[Patent Literature 2] Japanese Unexamined Patent Application Publication No. Hei 7-154974
[Patent Literature 3] Japanese Unexamined Patent Application Publication No. 2015-56993
Although the power conversion device is optimized to suit each purpose in the technique disclosed in each of Patent Literatures 1 to 3, it is difficult to realize downsizing by reducing the number of parts as an entire system and to improve reliability on a route where these circuits are mixed.
In view of the above-described problems, the present invention provides a power conversion device configured using a semiconductor module having a half-bridge configuration in which two semiconductor elements are arranged in series, wherein the semiconductor module has a substantially cuboidal shape, forms one phase configuring the power conversion device by providing a positive-electrode terminal, a negative-electrode terminal, and a terminal for inputting or outputting module AC or for a specific purpose along the longitudinal direction of the cuboid, and forms plural phases configuring the power conversion device by vertically arranging the plural semiconductor modules in the vertical direction that is the short-length direction of the cuboid, wherein the semiconductor modules of the plural phases are installed while coming into contact with cooling equipment, and wherein one or more capacitors are arranged on the opposite side of the cooling equipment across the semiconductor modules of the plural phases.
According to the present invention, a four-phase integrated power conversion device can be configured in such a manner that one phase is used for any one of a boosting circuit, an overvoltage suppression circuit, and a brake chopper circuit for a specific purpose and is combined with three phases configuring an inverter. Alternatively, in the case of an AC overhead contact line, a four-phase integrated power conversion device can be configured as a two-phase two-group converter.
As described above, all the circuits are integrated into four phases, or a combination of four-phase integrated power conversion devices is mounted, so that the number of individual necessary parts can be reduced, and the productivity of the power conversion device can be improved. In addition, downsizing by reducing the number of parts and a reduction in failure risk can be realized.
Hereinafter, first and second embodiments of a power conversion device according to the present invention will be described with reference to the drawings.
The power conversion device 100 is configured using cooling equipment 150, plural power modules 110, plural capacitors 120, a positive-electrode bus bar 40, a negative-electrode bus bar 50, and bus bars 61 to 64 for outputting or inputting or for specific purposes. The plural power modules (2-in-1 power modules) 110 are installed while coming into contact with the cooling equipment 150, and four 2-in-1 power modules 110 are arranged on the cooling equipment 150 while aligning a module short-length direction 5 with the vertical direction (see also
Here, a structure of a single 2-in-1 power module 110 is shown in
As described above, the length of the power conversion device 100 in the travelling direction can be shortened by employing the above-described configuration, and the pressure loss of the cooling equipment 150 that performs cooling using travelling wind can be advantageously reduced. In addition, a control signal line (not shown) can be extracted from space between the module positive-electrode terminal 6a and the terminal 6c for inputting or outputting module AC or for a specific purpose in the direction of the arrow dashed lines shown in
The power conversion device 100 is configured using, for example, a 2-in-1 power module 1 (111) in which a U-phase upper and lower arms series circuit is mounted, a 2-in-1 power module 2 (112) in which a V-phase upper and lower arms series circuit is mounted, a 2-in-1 power module 3 (113) in which a W-phase upper and lower arms series circuit is mounted, and a power module 4 (114) for a specific purpose to boost the contact line voltage. Hereinafter, the 2-in-1 power modules 111, 112, 113, and 114 of the respective phases will be simply referred to as power modules 110 when they are not especially distinguished from each other.
As shown in, for example,
Next, a four-phase integrated power conversion device to which specific functions can be added can be configured by applying and mounting the power conversion device 100 according to the first embodiment to an electric railroad vehicle 900. A concrete configuration example thereof will be described with reference to
The power conversion device 100 functions as an inverter in
In addition, in the case of the converter (power conversion device 100a) shown in
Next, individual configurations will be described.
The 2-in-1 power module 1 (111) of the first phase, the 2-in-1 power module 2 (112) of the second phase, and the 2-in-1 power module 3 (113) of the third phase serve as power modules corresponding to the U phase, V phase, and W phase, and the output terminals 1 to 3 (71 to 73) connected to a module AC terminal 6c of each power module are connected to the U phase, V phase, and W phase of the motor 500, respectively.
In addition, the 2-in-1 power module 4 (114) of the fourth phase is connected to the DC side of the inverter for the boosting circuit as a specific purpose, and a terminal (74) for a specific purpose of the power module is connected to the reactor 600.
Namely, as shown in Table 1 (a column indicated as “
Since the 2-in-1 power modules 1 to 3 (111 to 113) of the first to third phases configure a three-phase inverter, the connection modes are the same as those shown in
Namely, as shown in Table 1 (a column indicated as “
Since the 2-in-1 power modules 1 to 3 (111 to 113) of the first to third phases configure a three-phase inverter, the connection modes are the same as those shown in
Namely, as shown in Table 1 (a column indicated as “
In the configuration shown in
In the 2-in-1 power module 1 (111) of the first phase and the 2-in-1 power module 2 (112) of the second phase, input terminals 1″ and 2″ (71″ and 72″) are connected to the first group-side transformer 141. In addition, in the 2-in-1 power module 3 (113) of the third phase and the 2-in-1 power module 4 (114) of the fourth phase, input terminals 3″ and 4″ (73″ and 74″) are connected to the second group-side transformer 142. Accordingly, the two-group two-phase converter circuit is configured using the four 2-in-1 power modules 1 to 4 (111 to 114).
Namely, as shown in Table 1 (a column indicated as “
In addition, the four-phase integrated power conversion device can be configured to have a set of an inverter and a converter including various functions by being applied to the inverter side and the converter side. This example is shown in
Namely, according to the present invention, any combinations of the above-described circuits have the same hardware configuration as a power conversion device to be used. Therefore, it is possible to realize a reduction in the number of parts for adjusting interfaces between the circuits and to improve the productivity of the power conversion device, leading to downsizing of the device and improvement of reliability as a result.
As the structure of the first embodiment shown in
A second embodiment of the present invention to be described next has a structure to solve the point.
A structure of a power conversion device 100 according to the second embodiment is shown in
In the second embodiment, a single capacitor 120 is provided as shown in
As described above, in the second embodiment, the connection parts of the terminals 6c for inputting or outputting module AC or for specific purposes of the power module 110 are integrated not in the central part but at both ends of the power conversion device 100 unlike the first embodiment, and the module positive-electrode terminals 6a and the module negative-electrode terminals 6b are provided in the central part of the power conversion device 100. Accordingly, since one large capacitor 120 can be connected to the bus bars, electrostatic capacitance can be largely secured, and a noise can be more effectively suppressed.
Number | Date | Country | Kind |
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JP2018-011887 | Jan 2018 | JP | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/JP2018/038329 | 10/15/2018 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2019/146179 | 8/1/2019 | WO | A |
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Number | Date | Country |
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2848452 | Mar 2015 | EP |
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07-154974 | Jun 1995 | JP |
2014-014203 | Jan 2014 | JP |
2015-056993 | Mar 2015 | JP |
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Entry |
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International Search Report and Written Opinion of PCT/JP2018/038329 dated Dec. 25, 2018. |
International Preliminary Report on Patentability (PCT Chapter II), issued in counterpart International Application No. PCT/JP2018/038329 dated Jan. 7, 2020. |
Extended European Search Report received in corresponding European Application No. 18902193.4 dated Aug. 27, 2021. |
Number | Date | Country | |
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20210075342 A1 | Mar 2021 | US |