High-frequency DC / DC converter module for railway vehicle and railway vehicle

Abstract

The utility model provides a high-frequency DC / DC converter module for a railway vehicle and the railway vehicle. In the current transformation module, the inversion rectification unit and the voltage transformation unit are arranged in a first direction, and an inverter of the inversion rectification unit is provided with an inverter side output butt joint part facing one side of a high-frequency transformer of the voltage transformation unit in the first direction. A primary winding of the high-frequency transformer is provided with a transformer side input butt joint part facing one side of the inverter in the first direction, and a rectifier of the inversion rectification unit is provided with a rectifier side input butt joint part facing one side of the high-frequency transformer in the first direction. A secondary winding of the high-frequency transformer is provided with a transformer side output butt joint part facing one side of the rectifier in a first direction; the inverter rectification unit and the voltage transformation unit are electrically connected through butt joint of the inverter side output butt joint part and the transformer side input butt joint part and butt joint of the rectifier side input butt joint part and the transformer side output butt joint part in the first direction.

Description

Technical Field

[0001] The utility model relates to the field of railway equipment, and in particular to a high-frequency DC / DC converter module for railway vehicles, which converts power from upstream and outputs it to downstream in an auxiliary power supply system of a railway vehicle, and a railway vehicle using the high-frequency DC / DC converter module. Background Art

[0002] For railway vehicles such as electric locomotives that use electricity from the power supply grid to operate, the power system includes a traction power supply system and an auxiliary power supply system. Among them, the traction power supply system supplies power from the power supply grid to the traction motor to drive the railway vehicle. In addition, the auxiliary power supply system is used to convert the power from the power supply grid into power that can be used by on-board electrical equipment such as fans, water pumps, lighting, air conditioners, refrigerators, etc., so that these on-board electrical equipment can operate.

[0003] The voltage of the railway power supply network is usually very high, and after conversion by, for example, the intermediate DC link, it is also very high (for example, in my country, it is usually 1800V to 3600V). The on-board electrical equipment connected downstream of the auxiliary power supply system are all low-voltage loads, and they need to be isolated from the high-voltage side main circuit, such as the intermediate DC link.

[0004] At present, the above isolation is mainly achieved through an isolation transformer in the auxiliary power supply system.

[0005] For example, a common technology is to use an industrial frequency transformer for isolation. However, the industrial frequency transformer itself has the problem of being bulky and heavy. Moreover, the industrial frequency transformer is usually air-cooled, which requires the installation of air ducts, filters, blowers, etc., which will also aggravate the above-mentioned volume and weight problems. When installed in the converter cabinet of a railway vehicle, on the one hand, the industrial frequency transformer has to be separated from the inverter rectifier unit (inverter + rectifier) ​​and installed in different cabinet spaces and connected by wires. It is difficult to ensure the consistency of the inductance value, which brings difficulties to mass production. On the other hand, the lateral width of the railway vehicle is limited, resulting in a very narrow working space next to the converter cabinet (see Figure 7 The "aisle P" of the railway vehicle is difficult to be designed to be wider than the width of the power frequency transformer along the width direction of the railway vehicle. Therefore, in the event of a transformer failure, the transformer cannot be removed on the railway vehicle for maintenance. The converter cabinet must be lifted out of the railway vehicle as a whole, which requires a huge amount of work.

[0006] In addition, there is also a technology that uses high-frequency transformers for isolation, but the existing practice is to use air cooling for high-frequency transformers, which results in a large volume of the entire high-frequency transformer. It can only be set separately from the inverter rectifier unit in different cabinet spaces of the converter cabinet and connected to the inverter rectifier unit through wires, resulting in poor consistency of inductance value. In addition, there is also the problem that it cannot be maintained on-site on railway vehicles due to its large overall size. Utility Model Content

[0007] The utility model is proposed in view of the above problems, and its purpose is to provide a high-frequency DC / DC converter module for railway vehicles that can improve the consistency of transformer inductance value and is easy to maintain, and a railway vehicle using the high-frequency DC / DC converter module for railway vehicles.

[0008] To this end, the utility model provides a high-frequency DC / DC converter module for railway vehicles, which is used to convert the power from the upstream and output it to the downstream in the auxiliary power supply system, and comprises: an inverter rectifier unit, including an inverter, a rectifier and a liquid cooling component for the inverter and the rectifier; and a transformer unit, including a high-frequency transformer whose primary winding is electrically connected to the inverter and whose secondary winding is electrically connected to the rectifier, and a liquid cooling component for the transformer unit to cool the high-frequency transformer; the inverter rectifier unit and the transformer unit are arranged in a first direction, and the inverter has a An inverter side output docking portion is arranged toward one side of the high-frequency transformer in the first direction, the primary winding of the high-frequency transformer has a transformer side input docking portion arranged toward one side of the inverter in the first direction, the rectifier has a rectifier side input docking portion arranged toward one side of the high-frequency transformer in the first direction, the secondary winding of the high-frequency transformer has a transformer side output docking portion arranged toward one side of the rectifier in the first direction, and the inverter-rectifier unit and the transformer unit are electrically connected by docking the inverter side output docking portion with the transformer side input docking portion and the rectifier side input docking portion with the transformer side output docking portion respectively along the first direction.

[0009] According to the technical solution, on the one hand, both the inverter rectifier unit and the transformer unit are liquid-cooled, that is, the cooling method is unified, so the inverter rectifier unit and the transformer unit do not need to be independently set up separately from each other, allowing the two to be structurally combined with each other. On the other hand, by using a high-frequency transformer and adopting a liquid cooling solution for it, the overall size of the transformer unit can be ensured to be small. In this way, the inverter rectifier unit and the transformer unit can be installed in one cabinet space of the converter cabinet.

[0010] On this basis, by electrically connecting the inverter rectifier unit and the transformer unit by directly docking (overlapping) the docking parts instead of using wires to connect them, the influence of the wires on the inductance value of the transformer can be eliminated, making it easier to ensure the consistency of the inductance value of the transformer.

[0011] Moreover, since the inverter rectifier unit and the transformer unit are separate structures, and both the inverter rectifier unit and the transformer unit can be designed to be smaller than the width of the working space next to the converter cabinet, the inverter rectifier unit and the transformer unit can be taken out of the converter cabinet one by one during maintenance. Compared with the existing technology, the maintainability of the high-frequency DC / DC converter module can be greatly improved.

[0012] Therefore, according to the present technical solution, the above-mentioned purpose of the utility model can be achieved.

[0013] In addition, since the cooling components of the transformer unit are the same as those of the inverter rectifier unit, both are liquid-cooled, the same set of cooling liquid circulation devices (pumps, pipes, etc.) can be used, which is also conducive to overall compactness. In addition, the liquid cooling components for the inverter rectifier unit and the liquid cooling components for the transformer unit are independently arranged, which also facilitates the maintenance and replacement of each liquid cooling component.

[0014] In addition, preferably, the inverter-side output docking portion and the transformer-side input docking portion and / or the rectifier-side input docking portion and the transformer-side output docking portion are fixed to each other by fasteners.

[0015] According to this technical solution, the inverter rectifying unit and the transformer unit can be electrically connected more reliably.

[0016] In addition, preferably, the docking surfaces of the inverter side output docking part and the transformer side input docking part and / or the docking surfaces of the rectifier side input docking part and the transformer side output docking part are respectively formed into mutually matching shapes.

[0017] According to this technical solution, the contact resistance between the inverter and rectifier unit and the transformer unit can be reduced.

[0018] In addition, as a shape that matches each other, for example, the above-mentioned butt joint surface can be in a planar shape. In this way, the contact resistance can be reduced with a simple structure. Of course, the above-mentioned butt joint surface can also adopt other shapes that can match each other, such as one side is concave and the other side is convex.

[0019] In addition, preferably, the inverter-rectifier unit liquid cooling assembly is interposed between the inverter and the rectifier in a second direction intersecting the first direction.

[0020] According to the technical solution, by using a liquid cooling assembly for the inverter rectifier unit, the high voltage side (i.e., the inverter side) can be spatially isolated from the low voltage side (i.e., the rectifier side), thereby ensuring that the two sides can work without interfering with each other, and is also very beneficial for the hierarchical management of different levels of voltage.

[0021] In addition, preferably, the inverter side output docking part is arranged at the end away from the liquid cooling component for the inverter rectifier unit among the two end parts in the second direction of the inverter, and the transformer side input docking part and the inverter side output docking part are correspondingly arranged at one end in the second direction of the high-frequency transformer.

[0022] According to this technical solution, each docking portion on the high-pressure side can be further away from the low-pressure side equipment, which is more conducive to the isolation between the high-pressure side and the low-pressure side.

[0023] In addition, preferably, the rectifier side input docking portion is arranged at the end away from the liquid cooling component for the inverter rectifier unit at the two ends in the second direction of the rectifier, and the transformer side output docking portion and the rectifier side input docking portion are correspondingly arranged at the other end in the second direction of the high-frequency transformer.

[0024] According to this technical solution, each docking portion on the low-pressure side can be further away from the high-pressure side equipment, which is more conducive to the isolation between the high-pressure side and the low-pressure side.

[0025] In addition, in the present invention, preferably, the transformer unit includes a plurality of high-frequency transformers, and the plurality of high-frequency transformers are connected in parallel between the inverter and the rectifier.

[0026] According to the technical solution, by setting up a plurality of high-frequency transformers in parallel, the total power can be shared by a plurality of transformers, thereby reducing the heat generated by the transformer unit. In this way, the transformer can be sufficiently cooled by only setting up a liquid cooling assembly for the transformer unit at the bottom of the transformer, without extending the liquid cooling assembly for the transformer unit into the winding of the transformer, thereby reducing the design difficulty of the high-frequency transformer and the high-frequency DC / DC converter module as a whole.

[0027] In addition, preferably, two high-frequency transformers are provided.

[0028] According to this technical solution, it is possible to reduce the difficulty of designing a high-frequency transformer and, in turn, a high-frequency DC / DC converter module while taking into account the miniaturization of the entire high-frequency DC / DC converter module.

[0029] In addition, the utility model also provides a railway vehicle, which includes: a converter cabinet, which forms a plurality of cabinet spaces; and a high-frequency DC / DC converter module for railway vehicles in any of the above schemes, which is accommodated as a whole in one of the plurality of cabinet spaces.

[0030] According to the technical solution, the technical effect based on any of the above solutions can be obtained. Moreover, since the high-frequency DC / DC converter module for railway vehicles only occupies one cabinet space of the converter cabinet, the cabinet space can be saved for other expansion equipment.

[0031] In addition, preferably, the cabinet space is formed into a cylindrical shape having a bottom on one side in the width direction of the railway vehicle and an opening on the other side in the width direction, and the high-frequency DC / DC converter module for the railway vehicle is accommodated in one cabinet space in such a manner that the transformer unit is located on the bottom side in the width direction and the inverter rectifier unit is located on the opening side in the width direction.

[0032] According to this technical solution, on-site maintenance of high-frequency DC / DC converter modules for railway vehicles can be achieved inside the cramped space of railway vehicles without changing the existing layout design of the converter cabinet of the railway vehicle, which can save the design cost of the railway vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a perspective view showing the overall structure of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, and is a view viewed from the inverter side.

[0034] Figure 2 It is a perspective view showing the overall structure of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, and is a view viewed from the rectifier side.

[0035] Figure 3 It is a side view showing the overall structure of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, with a part of the frame assembly of the inverter rectifier unit omitted.

[0036] Figure 4 It is a perspective view showing the structure of an inverter rectifying unit included in the high-frequency DC / DC converter module for railway vehicles in the first embodiment.

[0037] Figure 5 It is a perspective view showing the structure of a transformer unit included in the high-frequency DC / DC converter module for railway vehicles in the first embodiment.

[0038] Figure 6 This is a schematic diagram showing an example of an equivalent circuit of the high-frequency DC / DC converter module for railway vehicles in the first embodiment.

[0039] Figure 7 It is a schematic diagram showing the internal layout of a railway vehicle in the second embodiment.

[0040] Figure 8 It is a schematic diagram showing an auxiliary converter cabinet of a railway vehicle according to the second embodiment.

[0041] Fig. 9 It is a side view showing the overall structure of a high-frequency DC / DC converter module for railway vehicles in a modified embodiment, with a portion of a frame assembly of an inverter rectifier unit omitted. DETAILED DESCRIPTION

[0042] The following embodiments of the present invention are described. Note that the following embodiments are listed to facilitate understanding of the present invention and are not intended to limit the present invention.

[0043] In addition, in this specification, ordinal expressions such as "first", "second", and "third" are sometimes used, but these ordinal expressions are only for distinguishing different things and do not represent a fixed order of appearance of things or their superiority or inferiority.

[0044] In addition, for the sake of ease of explanation, an orthogonal coordinate system will be introduced in this specification, in which the X-axis direction corresponds to the "first direction", the Z-axis direction corresponds to the "second direction", and the Y-axis direction corresponds to the "third direction", but this is just an example, and the "first direction", "second direction" and "third direction" can be in an intersecting relationship with each other and do not have to be orthogonal.

[0045] <1> First embodiment

[0046] [1-1] Overall structure

[0047] Hereinafter, the overall structure of a high-frequency DC / DC converter module for railway vehicles (hereinafter sometimes referred to as a “high-frequency DC / DC converter module”) in the first embodiment will be described.

[0048] Figure 1 1 is a perspective view showing the overall structure of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, and is a view viewed from the inverter 11 side of the inverter-rectifier unit 1 . Figure 2 1 is a perspective view showing the overall structure of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, and is a view viewed from the rectifier 12 side of the inverter-rectifier unit 1 .

[0049] The high-frequency DC / DC converter module for railway vehicles in this embodiment is used in an auxiliary power supply system carried by electric locomotives and other railway vehicles that use electricity from the power supply network to operate. It is used to convert the electricity from the upstream in the auxiliary power supply system and output it to the downstream to operate downstream on-board electrical equipment, such as lighting, air conditioning, refrigerators, etc.

[0050] like Figure 1 and Figure 2 As shown, the high-frequency DC / DC converter module for railway vehicles mainly includes an inverter rectifying unit 1 and a transformer unit 2 arranged along the X-axis direction.

[0051] First, the inverter rectifying unit 1 will be described.

[0052] The inverter-rectifier unit 1 is responsible for performing the inversion and rectification processing of electric power.

[0053] Figure 3 It is a side view showing the overall structure of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, and a part of the frame assembly 14 thereof is omitted in order to show the internal structure of the inverter rectifier unit 1 . Figure 4 It is a perspective view showing the structure of the inverter rectifying unit 1 included in the high-frequency DC / DC converter module for railway vehicles in the first embodiment.

[0054] Refer to Figure 3 and Figure 4 , the inverter rectifying unit 1 is arranged on one side in the X-axis direction.

[0055] The inverter-rectifier unit 1 includes an inverter 11 , a rectifier 12 , a liquid cooling assembly 13 , and a frame assembly 14 for holding the inverter 11 , the rectifier 12 and the liquid cooling assembly 13 .

[0056] The inverter 11 takes in direct current from upstream, inverts the direct current into alternating current of a required frequency using an inverter circuit composed of, for example, a support capacitor, a resonant capacitor, and a semiconductor switch module, and outputs the alternating current to high-frequency transformers 21 and 22 of the transformer unit 2 described later.

[0057] As the inverter circuit of the inverter 11, either a half-bridge inverter circuit or a full-bridge inverter circuit can be used. For example, from the perspective of reducing costs, it is preferred to use a half-bridge inverter circuit. In this case, as a half-bridge inverter circuit, either a symmetrical half-bridge structure or an asymmetrical half-bridge structure can be used. In addition, as a semiconductor switch module of the inverter circuit, for example, a metal oxide semiconductor field effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT) can be used. In the case of using a metal oxide semiconductor field effect transistor, for example, a silicon carbide metal oxide semiconductor field effect transistor (SiC-MOSFET) can be used. By using a silicon carbide metal oxide semiconductor field effect transistor, it is easier to achieve soft switching under high frequency conditions.

[0058] like Figure 1 , Figure 3 and Figure 4 As shown, the inverter 11 includes, as electrical connection terminals, a DC input terminal 11I for electrically connecting to an upstream DC source and an AC output terminal 11O for electrically connecting to corresponding high-frequency transformers 21 and 22 of the downstream transformer unit 2 .

[0059] The DC input terminal 11I includes a positive terminal 11Ip arranged on one side in the Y direction and a negative terminal 11In arranged on the other side in the Y direction. The two terminals are respectively connected to the positive and negative poles of the upstream DC source, and receive DC power from the upstream DC source.

[0060] The AC output terminals 11O are divided into multiple groups (for example, two groups), each group includes two AC output terminals 11O, and the two AC output terminals 11O are respectively electrically connected to the two connectors of the primary winding of the corresponding high-frequency transformer in the transformer unit 2 described later, and the AC power inverted by the inverter circuit is respectively input into the primary winding of the corresponding high-frequency transformer.

[0061] The two AC output terminals 110 in each set of AC output terminals 110 are arranged side by side in the Y-axis direction. In addition, the AC output terminals 110 in each set (that is, all the AC output terminals 110) are arranged side by side in the Y-axis direction.

[0062] like Figure 1 , Figure 3 and Figure 4 As shown, each AC output terminal 11O of the inverter 11 is respectively arranged on a corresponding composite busbar 11Bo led out from the output end of the inverter circuit, including a side boss portion 11O1 protruding from one side of the corresponding composite busbar 11Bo facing the one side in the X-axis direction and another side boss portion 11O2 (inverter side output docking portion) protruding from the other side of the corresponding composite busbar 11Bo facing the other side in the X-axis direction.

[0063] The one-side boss portion 1101 is in a tubular shape, for example, a cylindrical shape, extending in the X-axis direction, and its front end surface is formed into a flat surface for seating the head of a connecting bolt 144 described later.

[0064] In addition, the other side boss portion 11O2 is a tubular shape, such as a cylindrical shape, extending in the X-axis direction and concentric with the one side boss portion 11O1, and its front end surface is formed into a flat butt joint surface. The central through hole of the other side boss portion 11O2 and the central through hole of the one side boss portion 11O1 are connected to each other in the X-axis direction. When the inverter rectifier unit 1 and the transformer unit 2 are assembled, the other side boss portion 11O2 faces the side of the corresponding high-frequency transformer in the transformer unit 2 described later, and is electrically connected by connecting the butt joint surface of its front end with the matching butt joint surface of the corresponding AC input terminal of the high-frequency transformer.

[0065] In addition, the AC output terminal 11O of the inverter 11 (i.e., the other side boss portion 11O2 and the one side boss portion 11O1) is arranged at the end away from the liquid cooling component 13 among the two ends of the inverter 11 in the Z-axis direction, so as to be as far away from the rectifier 12 on the low voltage side as possible.

[0066] The rectifier 12 receives transformed AC power from the corresponding high-frequency transformer of the transformer unit 2 described later, rectifies the AC power into DC power using a rectifier circuit composed of, for example, a semiconductor switch module, a filter capacitor, etc., and outputs the DC power to downstream on-board electrical equipment, such as lighting, air conditioning, refrigerators, etc., for their use to enable them to operate.

[0067] A full-bridge rectifier circuit or a half-bridge rectifier circuit can be used as the rectifier circuit of the rectifier 12. For example, a fast recovery diode can be used as the semiconductor switch module.

[0068] In this embodiment, multiple (for example, two) rectifier circuits can be provided, which are arranged in parallel with each other and electrically connected to the corresponding high-frequency transformers of the transformer unit 2 respectively, rectifying the AC power from the corresponding high-frequency transformer into DC power and then superimposing the output.

[0069] like Figures 1 to 4 As shown, the rectifier 12 includes, as electrical connection terminals, an AC input terminal 12I for electrically connecting to a corresponding high-frequency transformer of the upstream transformation unit 2 and a DC output terminal 12O for electrically connecting to a downstream electrical device.

[0070] Among them, the AC input terminal 12I is divided into multiple groups (for example, two groups), each group includes two AC input terminals 12I, and the two AC input terminals 12I are respectively electrically connected to the two connectors of the secondary winding of the corresponding high-frequency transformer in the transformer unit 2 described later, so as to take the AC power from the secondary winding of the corresponding high-frequency transformer into the corresponding rectifier circuit.

[0071] The two AC input terminals 12I in each set of AC input terminals 12I are arranged side by side in the Y-axis direction. In addition, the AC input terminals 12I in each set (that is, all the AC input terminals 12I) are arranged side by side in the Y-axis direction.

[0072] like Figures 2 to 4 As shown, each AC input terminal 12I of the rectifier 12 is respectively arranged on a corresponding composite busbar 12Bi introduced into the input end of the rectifier circuit, including a side boss portion 12I1 protruding from one side of the corresponding composite busbar 12Bi in the X-axis direction and facing the one side, and another side boss portion 12I2 (rectifier side input docking portion) protruding from the other side of the corresponding composite busbar 12Bi in the X-axis direction and facing the other side.

[0073] The one-side boss portion 12I1 is in a tubular shape, for example, a cylindrical shape, extending in the X-axis direction, and its front end surface is formed into a flat surface for seating the head of a connecting bolt 145 described later.

[0074] In addition, the other side boss portion 12I2 is a tubular shape, such as a cylindrical shape, extending in the X-axis direction and concentric with the one side boss portion 12I1, and its front end surface is formed into a flat butt joint surface. The central through hole of the other side boss portion 12I2 and the central through hole of the one side boss portion 12I1 are connected to each other in the X-axis direction. When the inverter rectifier unit 1 and the transformer unit 2 are assembled, the other side boss portion 12I2 faces the corresponding high-frequency transformer side in the transformer unit 2 described later, and is electrically connected by connecting the butt joint surface of its front end with the matching butt joint surface of the corresponding AC output terminal of the high-frequency transformer.

[0075] In addition, the AC input terminal 12I of the rectifier 12 (i.e., the other side boss portion 12I2 and the one side boss portion 12I1) is arranged at the end away from the liquid cooling component 13 among the two ends of the rectifier 12 in the Z-axis direction, so as to be as far away from the inverter 11 on the high voltage side as possible.

[0076] like Figures 1 to 3 As shown, the DC output terminal 12O of the rectifier 12 is arranged on a composite busbar 12Bo which is led out from the output end of the rectifier circuit to the outside.

[0077] The DC output terminal 12O includes a positive terminal 12Op and a negative terminal 12On corresponding to each rectifier circuit, and is used to connect the positive and negative electrodes of the downstream electrical equipment to supply power to the downstream electrical equipment. In this embodiment, the positive terminals 12Op of each rectifier circuit can be connected to each other and to the positive electrode of the downstream electrical equipment, and the negative terminals 12On of each rectifier circuit can be connected to each other and to the negative electrode of the downstream electrical equipment, so as to supply power in a superimposed manner.

[0078] The liquid cooling assembly 13 is used to cool the inverter 11 and the rectifier 12 .

[0079] like Figure 1 and Figure 3 As shown, the liquid cooling assembly 13 includes a cooling plate 130 that is roughly formed into a flat plate shape extending in the X-axis direction and the Y-axis direction. A cooling liquid flow path is provided inside the cooling plate 130, and it can extend in a winding manner inside the cooling plate 130. A cooling liquid inlet 13I connected to the cooling liquid flow path inside the cooling plate 130 is provided at one end of the cooling plate 130 on one side in the X-axis direction and one side in the Y-axis direction, and a cooling liquid outlet 13O connected to the cooling liquid flow path inside the cooling plate 130 is provided at one end of the cooling plate 130 on one side in the X-axis direction and the other side in the Y-axis direction. By connecting a cooling liquid circulation device to the cooling plate 130 via the cooling liquid inlet 13I and the cooling liquid outlet 13O, the cooling liquid circulates in the cooling liquid flow path inside the cooling plate 130, and the liquid cooling assembly 13 is radiated, thereby cooling the inverter 11 and the rectifier 12.

[0080] like Figure 3 As shown, the liquid cooling assembly 13 , more specifically the cooling plate 130 of the liquid cooling assembly 13 is generally sandwiched between the inverter 11 and the rectifier 12 in the Z-axis direction, separating the inverter 11 from the rectifier 12 between the inverter 11 and the rectifier 12 .

[0081] The frame assembly 14 is used to hold the inverter 11 , the rectifier 12 and the liquid cooling assembly 13 .

[0082] like Figures 1 to 4 As shown, the frame assembly 14 includes a pair of side frames 141 located at both end sides relative to the inverter 11, the rectifier 12 and the liquid cooling assembly 13 in the Y-axis direction and an intermediate frame 142 located at one side relative to the inverter 11, the rectifier 12 and the liquid cooling assembly 13 in the X-axis direction. The intermediate frame 142 connects the pair of side frames 141 to each other at one end in the X-axis direction, so that the frame structure is formed by the pair of side frames 141 and the intermediate frame 142. The inverter 11, the rectifier 12 and the liquid cooling assembly 13 are retained in the frame assembly 14 by fixing at least a part of their components to the side frames 141 and / or the intermediate frame 142.

[0083] like Figure 4 As shown, a pair of side frames 141 are respectively formed with mounting ear plates 1410 bent toward the other side at the end portions on the other side in the X-axis direction, and mounting holes 1411 are respectively formed on the mounting ear plates 1410 to penetrate along the X-axis direction.

[0084] Accordingly, if Figures 1 to 3 As shown, at both ends of the middle frame 142 in the Y-axis direction, mounting holes are formed in the X-axis direction at positions corresponding to the mounting holes 1411 on the mounting ear plates 1410 of a pair of side frames 141.

[0085] like Figures 1 to 4 As shown, the frame assembly 14 further includes a pair of fixing members 143. The pair of fixing members 143 respectively include a cylindrical sleeve 1431 and a long rod-shaped bolt 1432. Figure 3The sleeve 1431 is clamped between the mounting ear plate 1410 of the side frame 141 and the middle frame 142 along the X-axis direction in such a way that the openings at both ends of the center hole are aligned with the corresponding mounting holes 1411 on the mounting ear plate 1410 of the side frame 141 and the mounting holes on the middle frame 142. The bolt 1432 passes through the mounting hole on the middle frame 142, the center hole of the sleeve 1431, and the mounting hole 1411 on the mounting ear plate 1410 of the side frame 141 in sequence along the X-axis direction, and the front end thread is screwed into the thread of the corresponding mounting hole 241 on the frame assembly 24 of the transformer unit 2 described later, thereby fixing the frame assembly 14 and the frame assembly 24, and then the inverter rectifier unit 1 and the transformer unit 2 together.

[0086] In addition, the frame assembly 14 further includes connecting bolts 144 (fasteners) and connecting bolts 145 (fasteners). These connecting bolts will be described in detail later.

[0087] Next, the transformation unit 2 will be described.

[0088] The transformer unit 2 is responsible for transforming the electric power.

[0089] like Figure 1 and Figure 2 As shown, the transformer unit 2 is arranged on the other side of the inverter and rectifier unit 1 in the X-axis direction, and is adjacent to the inverter and rectifier unit 1 in the X-axis direction.

[0090] Figure 5 It is a perspective view showing the structure of the transformer unit 2 included in the high-frequency DC / DC converter module for railway vehicles in the first embodiment.

[0091] Refer to Figure 5 The transformer unit 2 includes a plurality of high frequency transformers, which are high frequency transformers 21 and 22. In addition, the transformer unit 2 also includes a liquid cooling assembly 23 and a frame assembly 24.

[0092] The high frequency transformers 21 and 22 are arranged side by side in the Y-axis direction. That is, the high frequency transformers 21 and 22 are arranged adjacent to each other in the Y-axis direction.

[0093] In addition, in the present embodiment, the high-frequency transformers 21 and 22 are connected in parallel with each other between the inverter 11 and the rectifier 12 of the inverter-rectifier unit 1 .

[0094] The high frequency transformer 21 includes a housing 210 , a transformer unit (not shown) provided in the housing 210 , and a potting compound 211 for potting the housing 210 and the transformer unit.

[0095] In this embodiment, the housing 210 is formed into a container-like structure having an opening on one side of the inverter rectifier unit 1 in the X-axis direction and a bottom plate on one side of the liquid cooling assembly 23 in the X-axis direction, and is fixed on the cooling plate 230 in a manner that the bottom plate contacts the cooling plate 230 of the liquid cooling assembly 23. The housing 210 is used to accommodate the transformer unit and receive the potting of the potting glue 211.

[0096] The voltage transformation unit is disposed in the inner space of the housing 210 .

[0097] As a specific structure, the transformer part has an iron core, a primary winding wound on the primary side of the iron core, AC input terminals 21I (transformer side input docking part) respectively led out from two connectors of the primary winding, a secondary winding wound on the secondary side of the iron core, and AC output terminals 21O (transformer side output docking part) respectively led out from two connectors of the secondary winding.

[0098] The primary winding of the transformer is electrically connected to the inverter 11 of the inverter-rectifier unit 1, and the secondary winding is electrically connected to the rectifier 12 of the inverter-rectifier unit 1. The AC power from the inverter 11 of the inverter-rectifier unit 1 is input into the primary winding via the AC input terminal 21I, and is transformed under the joint action of the primary winding and the secondary winding, and then output from the secondary winding to the rectifier 12 of the inverter-rectifier unit 1 via the AC output terminal 21O, thereby realizing its transformation function.

[0099] like Figure 5 As shown, the AC input terminal 21I is led out from the primary winding of the transformer to the outside of the housing 210 , specifically, to one end of the housing 210 in the Z-axis direction corresponding to the AC output terminal 11O of the inverter 11 of the inverter rectifier unit 1 .

[0100] A pair of AC input terminals 21I are provided. The pair of AC input terminals 21I are arranged adjacent to each other along the Y-axis direction and are insulated from each other. The pair of AC input terminals 21I respectively have a plate-like portion extending in the Y-axis direction and the Z-axis direction, that is, they are arranged toward (facing) the inverter 11 side of the inverter rectifier unit 1 in the X-axis direction, and are electrically connected with the corresponding AC output terminal 11O by using their planar docking surface to make surface contact (dock) with the matching front end surface of the boss portion 11O2 on the other side of the corresponding AC output terminal 11O in the inverter 11, that is, the planar docking surface, along the X-axis direction, thereby achieving electrical connection with the corresponding AC output terminal 11O, thereby achieving electrical connection between the high-frequency transformer 21 of the transformer unit 2 and the inverter 11 of the inverter rectifier unit 1.

[0101] In addition, the plate-like portions of the pair of AC input terminals 21I are respectively formed with connection holes 21I1 extending through the pair of AC input terminals 21I in the X-axis direction, and connection nuts 21I2 ( Figure 3 ), by inserting the connecting bolts 144 of the frame assembly 14 of the inverter rectifier unit 1 into the center holes of the corresponding AC output terminals 11O of the inverter 11 of the inverter rectifier unit 1 (i.e., the concentric center through holes of the boss portion 11O1 on one side and the boss portion 11O2 on the other side) and the connecting holes 21I1 in sequence, and screwing the threads of the front ends with the threads of the connecting nut 21I2, the AC input terminals 21I and the corresponding AC output terminals 11O of the inverter 11 of the inverter rectifier unit 1 can be reliably contacted with each other on the surface, thereby achieving a more reliable electrical connection between the high-frequency transformer 21 of the transformer unit 2 and the inverter 11 of the inverter rectifier unit 1.

[0102] like Figure 5 As shown, the AC output terminal 21O is led out from the secondary winding of the transformer unit to the outside of the housing 210 , specifically, to the other end of the housing 210 in the Z-axis direction corresponding to the AC input terminal 12I of the rectifier 12 of the inverter rectifier unit 1 .

[0103] A pair of AC output terminals 21O are provided. The pair of AC output terminals 21O are arranged adjacent to each other along the Y-axis direction and are insulated from each other. The pair of AC output terminals 21O respectively have plate-like portions extending in the Y-axis direction and the Z-axis direction, that is, they are arranged toward (facing) one side of the rectifier 12 of the inverter rectifier unit 1 in the X-axis direction, and are electrically connected with the corresponding AC input terminal 12I by using their planar docking surfaces to make surface contact (dock) with the matching front end surface of the boss portion 12I2 on the other side of the corresponding AC input terminal 12I in the rectifier 12, that is, the planar docking surface, along the X-axis direction, thereby achieving electrical connection with the corresponding AC input terminal 12I, thereby achieving electrical connection between the high-frequency transformer 21 of the transformer unit 2 and the rectifier 12 of the inverter rectifier unit 1.

[0104] In addition, connection holes 21O1 penetrating along the X-axis direction are respectively formed on the above-mentioned plate-like portions of a pair of AC output terminals 21O, and a connecting nut (not shown) is fixed on the side of the above-mentioned plate-like portions of the pair of AC output terminals 21O opposite to the mating surface. By inserting the connecting bolts 145 of the frame assembly 14 of the inverter rectifier unit 1 into the center holes (i.e., the concentric center through holes of the boss portion 12I1 on one side and the boss portion 12I2 on the other side) and the connecting holes 21O1 of the corresponding AC input terminals 12I of the rectifier 12 of the inverter rectifier unit 1 in sequence and screwing the threads at the front ends into the threads of the above-mentioned connecting nut, the AC output terminals 21O and the corresponding AC input terminals 12I of the rectifier 12 of the inverter rectifier unit 1 can be reliably in surface contact, thereby achieving a more reliable electrical connection between the high-frequency transformer 21 of the transformer unit 2 and the rectifier 12 of the inverter rectifier unit 1.

[0105] The potting compound 211 is poured into the housing 210, specifically, into the gap between the housing 210 and the transformer unit and the gap of the transformer unit itself, so as to fix the transformer unit in the housing 210. As the material of the potting compound, epoxy resin or the like can be used.

[0106] Note that after the potting compound 211 is filled, at least the plate-shaped portion of each of the AC input terminal 21I and the AC output terminal 21O is exposed from the potting compound 211 .

[0107] The high frequency transformer 22 includes a housing 220 , a transformer unit (not shown) provided in the housing 220 , and a potting compound 221 for potting the housing 220 and the transformer unit.

[0108] In this embodiment, the housing 220 is formed into a container-like structure having an opening on one side of the inverter rectifier unit 1 in the X-axis direction and a bottom plate on one side of the liquid cooling assembly 23 in the X-axis direction, and is fixed on the cooling plate 230 in such a way that its bottom plate contacts the cooling plate 230 of the liquid cooling assembly 23. The housing 220 is used to accommodate the transformer unit and receive the potting of the potting compound 221.

[0109] The voltage transformation unit is disposed in the inner space of the housing 220 .

[0110] As a specific structure, the transformer part has an iron core, a primary winding wound on the primary side of the iron core, AC input terminals 22I (transformer side input docking part) respectively led out from two connectors of the primary winding, a secondary winding wound on the secondary side of the iron core, and AC output terminals 22O (transformer side output docking part) respectively led out from two connectors of the secondary winding.

[0111] The primary winding of the transformer is electrically connected to the inverter 11 of the inverter-rectifier unit 1, and the secondary winding is electrically connected to the rectifier 12 of the inverter-rectifier unit 1. The AC power from the inverter 11 of the inverter-rectifier unit 1 is input into the primary winding via the AC input terminal 22I, and is transformed under the joint action of the primary winding and the secondary winding, and then output from the secondary winding to the rectifier 12 of the inverter-rectifier unit 1 via the AC output terminal 22O, thereby realizing its transformation function.

[0112] like Figure 5 As shown, the AC input terminal 22I is led out from the primary winding of the transformer to the outside of the housing 220 , specifically, to one end of the housing 220 in the Z-axis direction corresponding to the AC output terminal 110 of the inverter 11 of the inverter rectifier unit 1 .

[0113] A pair of AC input terminals 22I are provided. The pair of AC input terminals 22I are arranged adjacent to each other along the Y-axis direction and are insulated from each other. The pair of AC input terminals 22I respectively have a plate-shaped portion extending in the Y-axis direction and the Z-axis direction, that is, they are arranged toward (facing) the inverter 11 side of the inverter rectifier unit 1 in the X-axis direction, and are electrically connected with the corresponding AC output terminal 11O by using their planar docking surface to make surface contact (dock) with the matching front end surface of the boss portion 11O2 on the other side of the corresponding AC output terminal 11O in the inverter 11, that is, the planar docking surface, along the X-axis direction, thereby achieving electrical connection with the corresponding AC output terminal 11O, thereby achieving electrical connection between the high-frequency transformer 22 of the transformer unit 2 and the inverter 11 of the inverter rectifier unit 1.

[0114] In addition, connection holes 22I1 that penetrate along the X-axis direction are respectively formed on the above-mentioned plate-like portions of a pair of AC input terminals 22I, and a connecting nut not shown is fixed on the side of the above-mentioned plate-like portions of a pair of AC input terminals 21I opposite to the mating surface. By inserting the connecting bolts 144 of the frame assembly 14 of the inverter rectifier unit 1 into the center holes (i.e., the concentric center through holes of the boss portion 11O1 on one side and the boss portion 11O2 on the other side) and the connecting holes 22I1 of the corresponding AC output terminals 11O of the inverter 11 of the inverter rectifier unit 1 in sequence and screwing the threads at the front end into the threads of the connecting nut, the AC input terminal 22I and the corresponding AC output terminal 11O of the inverter 11 of the inverter rectifier unit 1 can be reliably in surface contact, thereby achieving a more reliable electrical connection between the high-frequency transformer 22 of the transformer unit 2 and the inverter 11 of the inverter rectifier unit 1.

[0115] Furthermore, the pair of AC input terminals 22I of the high-frequency transformer 22 and the pair of AC input terminals 21I of the high-frequency transformer 21 are provided so as to be aligned with each other in the Y-axis direction.

[0116] like Figure 5 As shown, the AC output terminal 22O is led out from the secondary winding of the transformer unit to the outside of the housing 220 , specifically, to the other end of the housing 220 in the Z-axis direction corresponding to the AC input terminal 12I of the rectifier 12 of the inverter rectifier unit 1 .

[0117] A pair of AC output terminals 22O are provided. The pair of AC output terminals 22O are arranged adjacent to each other along the Y-axis direction and are insulated from each other. The pair of AC output terminals 22O respectively have plate-like portions extending in the Y-axis direction and the Z-axis direction, that is, they are arranged toward (facing) one side of the rectifier 12 of the inverter rectifier unit 1 in the X-axis direction, and are electrically connected with the corresponding AC input terminal 12I by using their planar docking surfaces to make surface contact (dock) with the matching front end surface of the boss portion 12I2 on the other side of the corresponding AC input terminal 12I in the rectifier 12, that is, the planar docking surface, along the X-axis direction, thereby achieving electrical connection with the corresponding AC input terminal 12I, thereby achieving electrical connection between the high-frequency transformer 22 of the transformer unit 2 and the rectifier 12 of the inverter rectifier unit 1.

[0118] In addition, connection holes 22O1 penetrating along the X-axis direction are respectively formed on the above-mentioned plate-like portions of a pair of AC output terminals 22O, and a connecting nut (not shown) is fixed on the side of the above-mentioned plate-like portions of the pair of AC output terminals 22O opposite to the mating surface. By inserting the connecting bolts 145 of the frame assembly 14 of the inverter rectifier unit 1 into the center holes (i.e., the concentric center through holes of the boss portion 12I1 on one side and the boss portion 12I2 on the other side) and the connecting holes 22O1 of the corresponding AC input terminals 12I of the rectifier 12 of the inverter rectifier unit 1 in sequence and screwing the threads at the front ends into the threads of the above-mentioned connecting nut, the AC output terminals 22O and the corresponding AC input terminals 12I of the rectifier 12 of the inverter rectifier unit 1 can be reliably in surface contact, thereby achieving a more reliable electrical connection between the high-frequency transformer 22 of the transformer unit 2 and the rectifier 12 of the inverter rectifier unit 1.

[0119] Furthermore, the pair of AC output terminals 22O of the high-frequency transformer 22 and the pair of AC output terminals 21O of the high-frequency transformer 21 are provided so as to be aligned with each other in the Y-axis direction.

[0120] The potting compound 221 is poured into the housing 220, specifically, into the gap between the housing 220 and the transformer unit and the gap of the transformer unit itself, so as to fix the transformer unit in the housing 220. As the material of the potting compound, epoxy resin or the like can be used.

[0121] Note that after the potting compound 221 is filled, at least the plate-shaped portion of each of the AC input terminal 22I and the AC output terminal 22O is exposed from the potting compound 221 .

[0122] The liquid cooling assembly 23 is used to cool the high-frequency transformers 21 and 22 .

[0123] like Figures 1 to 3 and Figure 5 As shown, the liquid cooling component 23 includes a cooling plate 230 that is roughly formed into a flat plate extending in the Y-axis direction and the Z-axis direction. A cooling liquid flow path is provided inside the cooling plate 230, which can extend in a winding manner inside the cooling plate 230. A cooling liquid inlet 23I connected to the cooling liquid flow path inside the cooling plate 230 is provided at one end of the cooling plate 230 in the Y-axis direction and one end of the cooling plate 230 in the Z-axis direction, and a cooling liquid outlet 23O connected to the cooling liquid flow path inside the cooling plate 230 is provided at the other end of the cooling plate 230 in the Y-axis direction and the other end of the cooling plate 230 in the Z-axis direction. By connecting a cooling liquid circulation device to the cooling plate 230 via the cooling liquid inlet 23I and the cooling liquid outlet 23O, the cooling liquid circulates in the cooling liquid flow path inside the cooling plate 230, and the liquid cooling component 23 is radiated, thereby cooling the high-frequency transformers 21 and 22.

[0124] like Figures 1 to 3 As shown, the liquid cooling assembly 23, more specifically, the cooling plate 230 of the liquid cooling assembly 23 is provided at the end of the housing 210 of the high frequency transformer 21 and the housing 220 of the high frequency transformer 22 on the opposite side of the inverter rectifier unit 1 in a manner that contacts the bottom plate of the housing 210 of the high frequency transformer 21 and the bottom plate of the housing 220 of the high frequency transformer 22 in the X-axis direction. As a fixing method between the cooling plate 230 of the liquid cooling assembly 23 and the housing 210 of the high frequency transformer 21 and the housing 220 of the high frequency transformer 22, for example, bolt connection or the like can be used.

[0125] In addition, fixing holes 231 extending along the X-axis direction are respectively provided at the four corners of the cooling plate 230. The fixing holes 231 are used to install the transformer unit 2, and then the entire high-frequency DC / DC converter module for railway vehicles, at a desired location (such as a bracket in a converter cabinet).

[0126] The frame assembly 24 is used to fix the transformer unit 2 and the inverter rectifier unit 1 .

[0127] like Figure 5As shown, the frame assembly 24 is fixed to the end of the housing 210 of the high-frequency transformer 21 and the housing 220 of the high-frequency transformer 22 on one side of the inverter rectifier unit 1. Mounting holes 241 extending along the X-axis direction are formed at positions of the frame assembly 24 corresponding to the mounting holes 1411 on the mounting ear plates 1410 of a pair of side frames 141 of the frame assembly 14 of the inverter rectifier unit 1, and threads are formed in the mounting holes 241 for matching with threads of bolts 1432 of corresponding fixing members 143 of the frame assembly 14 of the inverter rectifier unit 1. As mentioned above, the frame assembly 14 of the inverter rectifier unit 1 and the frame assembly 24 of the transformer unit 2, and then the inverter rectifier unit 1 and the transformer unit 2, are fixed together by sequentially passing the bolt 1432 of the fixing member 143 through the mounting hole on the middle frame 142 of the frame assembly 14 of the inverter rectifier unit 1, the center hole of the sleeve 1431 of the fixing member 143, and the mounting hole 1411 on the mounting ear plate 1410 of the side frame 141 along the X-axis direction and screwing the front end thread with the thread of the mounting hole 241 on the frame assembly 24.

[0128] [1-2] Equivalent circuit

[0129] Hereinafter, an equivalent circuit of the high-frequency DC / DC converter module for railway vehicles in the first embodiment will be described. Note that this equivalent circuit is only an example.

[0130] Figure 6 This is a schematic diagram showing an example of an equivalent circuit of the high-frequency DC / DC converter module for railway vehicles in the first embodiment.

[0131] like Figure 6 As shown, in the equivalent circuit of this example, the high-frequency DC / DC converter module for railway vehicles includes an inverter circuit 11' on the upstream side, a transformer circuit 2' including transformer circuits 21' and 22' on the intermediate side, and a rectifier circuit 12' on the downstream side.

[0132] The inverter circuit 11' comprises a first bridge arm provided with a support capacitor FC1, a second bridge arm provided with two resonant capacitors RC1 and RC2, and a third bridge arm provided with two semiconductor switch modules SW1 and SW2. The support capacitor FC1 is used to eliminate ripples in the input DC and stabilize the DC input voltage. The resonant capacitors RC1 and RC2 and the semiconductor switch modules SW1 and SW2 are used to perform an inversion to convert DC to AC. The semiconductor switch modules SW1 and SW2 can be respectively formed by metal oxide semiconductor field effect transistors and diodes connected in parallel with each other.

[0133] One terminal of the primary winding of the transformer circuit 21' is electrically connected to the midpoint of the two semiconductor switch modules SW1 and SW2 on the third bridge arm, and the other terminal of the primary winding of the transformer circuit 21' is electrically connected to one terminal of the primary winding of the transformer circuit 22', and the other terminal of the primary winding of the transformer circuit 22' is electrically connected to the midpoint of the two resonant capacitors RC1 and RC2 on the second bridge arm. That is, the transformer circuits 21' and 22' are electrically connected to the inverter circuit 11' in series with each other on the primary side. In this way, the excitation inductances Lm1 and Lm2 and the resonant inductances (leakage inductances) Lr1 and Lr2 of the inverter circuit 11' and the transformer circuits 21' and 22' together constitute a half-bridge LLC inverter circuit.

[0134] Two rectifier circuits 12' are provided corresponding to transformer circuits 21' and 22'. The two rectifier circuits 12' respectively include a fourth bridge arm provided with two diode switches RD1 and RD3 and a fifth bridge arm provided with two diode switches RD2 and RD4, forming a full-bridge rectifier circuit. The two rectifier circuits 12' are provided in parallel with each other and share a filter capacitor FC2.

[0135] One terminal of the secondary winding of the transformer circuit 21' is electrically connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the corresponding rectifier circuit 12', and the other terminal is electrically connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit 12'. One terminal of the secondary winding of the transformer circuit 22' is electrically connected to the midpoint of the two diode switches RD1 and RD3 on the fourth bridge arm of the corresponding rectifier circuit 12', and the other terminal is electrically connected to the midpoint of the two diode switches RD2 and RD4 on the fifth bridge arm of the rectifier circuit 12'. That is, the transformer circuits 21' and 22' are electrically connected to the rectifier circuit 12' in parallel on the secondary side.

[0136] In this way, an equivalent circuit of the high-frequency DC / DC converter module for railway vehicles is constructed.

[0137] The DC power from upstream is input from the input terminals Pi and Ni, rectified into AC power by the inverter circuit 11', then transformed into AC power of the required voltage by the transformer circuits 21' and 22', and finally rectified into the required DC power by the rectifier circuit 12' and output from the output terminals Po and No.

[0138] [1-3] Technical Effects

[0139] Hereinafter, main technical effects that can be achieved by the high-frequency DC / DC converter module for railway vehicles according to the first embodiment will be described.

[0140] According to the above embodiment, on the one hand, the inverter rectifier unit 1 and the transformer unit 2 are both liquid-cooled, that is, the cooling method is unified, so the inverter rectifier unit 1 and the transformer unit 2 do not need to be independently set up separately from each other, allowing the two to be structurally combined with each other. On the other hand, by using a high-frequency transformer and adopting a liquid cooling solution for it, the overall size of the transformer unit can be ensured to be small. In this way, the inverter rectifier unit 1 and the transformer unit 2 can be installed in a cabinet space of the converter cabinet.

[0141] On this basis, by electrically connecting the inverter rectifier unit 1 and the transformer unit 2 directly at the docking parts (AC output terminal 11O and AC input terminals 21I, 22I, AC input terminal 12I and AC output terminals 21O, 22O) instead of using wires for connection, the influence of the wires on the inductance value of the transformer can be eliminated, and the consistency of the inductance value of the transformer can be easily ensured.

[0142] Moreover, since the inverter rectifier unit 1 and the transformer unit 2 are separate structures, and both the inverter rectifier unit 1 and the transformer unit 2 can be designed to be smaller than the width of the working space next to the converter cabinet. Therefore, when maintaining the high-frequency DC / DC converter module, the inverter rectifier unit 1 and the transformer unit 2 can be structurally separated by removing the fixings 143, the connecting bolts 144 and the connecting bolts 145, and the inverter rectifier unit 1 and the transformer unit 2 can be taken out of the converter cabinet one by one, and can be maintained on the railway vehicle. Compared with the prior art, there is no need to lift the converter cabinet out of the railway vehicle as a whole, which can greatly improve the maintainability of the high-frequency DC / DC converter module.

[0143] In particular, providing two high-frequency transformers 21, 22 can more easily bring about the above-mentioned beneficial effects.

[0144] In addition, in the inverter rectifier unit 1, since the cooling plate 130 of the liquid cooling assembly 13 is generally sandwiched between the inverter 11 and the rectifier 12 in the Z-axis direction, the high-voltage side (i.e., the inverter 11 side) and the low-voltage side (i.e., the rectifier 12 side) are spatially isolated, and the high-frequency DC / DC converter module can be operated under the premise of ensuring that the high-voltage side and the low-voltage side do not interfere with each other. Moreover, such a structural design is also very conducive to the hierarchical management of different levels of voltage.

[0145] In addition, since the AC output terminal 11O of the inverter 11 is arranged at the end of the two ends of the inverter 11 on the side away from the liquid cooling component 13 in the Z-axis direction, correspondingly, the AC input terminal 21I of the primary winding of the high-frequency transformer 21, 22 is led to one end of the housing 210 in the Z-axis direction, and the AC input terminal 12I of the rectifier 12 is arranged at the end of the two ends of the rectifier 12 on the side away from the liquid cooling component 13 in the Z-axis direction, correspondingly, the AC output terminal 21O of the secondary winding of the high-frequency transformer 21, 22 is led to the other end of the housing 210 in the Z-axis direction, so that the electrical connection terminal on the high-voltage side and the electrical connection terminal on the low-voltage side can be sufficiently separated in space, which is more conducive to isolation between the high-voltage side and the low-voltage side.

[0146] In addition, since the inverter 11 and the rectifier 12 share a liquid cooling assembly 13 , a more compact design can be achieved for the high-frequency DC / DC converter module.

[0147] In addition, by using a circuit structure in which transformer circuits 21' and 22' are electrically connected to the inverter circuit 11' in series on the primary side as in the above-mentioned equivalent circuit, it is possible to ensure that the currents flowing in the primary windings of the high-frequency transformers 21 and 22 are the same, so that the powers of the two high-frequency transformers 21 and 22 are automatically balanced, avoiding the situation in which the power of one high-frequency transformer becomes larger and the power of the other high-frequency transformer becomes smaller, which is beneficial to the design of the transformer unit.

[0148] <2> Second embodiment

[0149] [2-1] Overall structure

[0150] Hereinafter, the overall structure of the railway vehicle in the second embodiment will be described.

[0151] The railway vehicle of this embodiment is provided with the high-frequency DC / DC converter module for railway vehicles of the first embodiment in the converter cabinet, and the rest can adopt the existing structure.

[0152] Figure 7 Schematic diagram showing the internal layout of the railway vehicle in the present embodiment, and is a diagram showing the internal layout of the railway vehicle as viewed from above the railway vehicle.

[0153] like Figure 7As shown, the railway vehicle in this embodiment includes a first auxiliary converter cabinet ACC1 and a first safety equipment cabinet SaC1 opposite to the railway vehicle across the aisle P in the width direction, a first main converter cabinet MCC1 and a first system equipment SyE1 and a toilet T opposite to the railway vehicle across the aisle P in the width direction, a second main converter cabinet MCC2 and a brake plate B and a radio equipment cabinet RaC opposite to the railway vehicle across the aisle P in the width direction, a third main converter cabinet MCC3 and a second system equipment SyE2 opposite to the aisle P in the width direction of the railway vehicle, a second auxiliary converter cabinet ACC2 and a second safety equipment cabinet SaC2 opposite to the aisle P in the width direction of the railway vehicle, etc.

[0154] Figure 8 FIG. 2 is a schematic diagram showing an auxiliary converter cabinet of a railway vehicle in a second embodiment. Figure 8 In the figure, the high-frequency DC / DC converter module for railway vehicles is represented as "DC / DC".

[0155] like Figure 8 As shown, a plurality of cabinet spaces C1, C2, C3, ... (hereinafter referred to as "cabinet spaces C") are formed inside the first auxiliary converter cabinet ACC1 and the second auxiliary converter cabinet ACC2 (converter cabinets). The cabinet space C is formed into a cylindrical shape having an opening Co on the side facing the safety equipment cabinet and a bottom Cb on the side opposite to the opening Co.

[0156] The high-frequency DC / DC converter module for railway vehicles is installed in at least one of the first auxiliary converter cabinet ACC1 and the second auxiliary converter cabinet ACC2.

[0157] Specifically, at the bottom Cb of the cabinet space C, there is a threaded hole extending in the width direction of the railway vehicle and aligned with the fixing hole 231 on the cooling plate 230 of the liquid cooling assembly 23 of the transformer unit 2 of the high-frequency DC / DC converter module for railway vehicles.

[0158] When installing the high-frequency DC / DC converter module into the cabinet space C, first, the operator who enters the aisle P of the railway vehicle puts the transformer unit 2 of the high-frequency DC / DC converter module into the cabinet space C from the opening Co side of the cabinet space C in such a way that the cooling plate 230 faces the bottom Cb of the cabinet space C, and screws the fastening bolts through the fixing holes 231 on the cooling plate 230 into the threaded holes of the bottom Cb of the cabinet space C, thereby fastening the transformer unit 2 to the bottom Cb of the cabinet space C. Then, the operator puts the inverter rectifier unit 1 of the high-frequency DC / DC converter module into the cabinet space C from the opening Co side of the cabinet space C, and tightens the bolts 1432, the connecting bolts 144 and the connecting bolts 145 of the fixing member 143, thereby fixing the inverter rectifier unit 1 to the transformer unit 2. Thus, the installation of the high-frequency DC / DC converter module into the cabinet space C is completed.

[0159] When removing the high-frequency DC / DC converter module from the cabinet space C, first, the operator who enters the aisle P of the railway vehicle unscrews the bolts 1432, the connecting bolts 144, and the connecting bolts 145 of the fixing member 143 to separate the inverter rectifier unit 1 from the transformer unit 2, and takes the inverter rectifier unit 1 out of the opening Co of the cabinet space C to the aisle P. Then, the operator unscrews the fastening bolts between the cooling plate 230 and the bottom Cb of the cabinet space C to separate the transformer unit 2 from the bottom Cb of the cabinet space C, and takes the transformer unit 2 out of the opening Co of the cabinet space C to the aisle P. Thus, the removal of the high-frequency DC / DC converter module from the cabinet space C is completed.

[0160] [2-2] Technical Effects

[0161] Hereinafter, main technical effects of the railway vehicle according to the second embodiment will be described.

[0162] According to the above-mentioned railway vehicle, in addition to the above-mentioned effects similar to those of the high-frequency DC / DC converter module for railway vehicles in the first embodiment, the following technical effects can be achieved.

[0163] Since the high-frequency DC / DC converter module for railway vehicles only occupies one cabinet space of the converter cabinet, the cabinet space can be saved for other expansion equipment.

[0164] Moreover, without changing the existing layout design of the converter cabinet of the railway vehicle, on-site maintenance of the high-frequency DC / DC converter module for the railway vehicle can be achieved inside the cramped space of the railway vehicle, which can save the design cost of the railway vehicle.

[0165] <3> other

[0166] The above describes the various embodiments of the present invention, but these embodiments are proposed for easy understanding of the present invention, and the protection scope of the present invention is not limited to these embodiments. Those skilled in the art can make various modifications to these embodiments without departing from the technical idea of ​​the present invention. Below, these modifications are illustrated.

[0167] (1) In the above-mentioned embodiment, the butt joint surfaces of the AC output terminal 11O of the inverter 11, the AC input terminal 21I and the AC output terminal 21O of the high-frequency transformer 21, the AC input terminal 22I and the AC output terminal 22O of the high-frequency transformer 22, and the AC input terminal 12I of the rectifier 12 are formed into a planar shape, but the present invention is not limited thereto. It is sufficient that the butt joint surfaces are formed into shapes that match each other. For example, one of the butt joint surfaces is formed into a concave shape, and the other is formed into a convex shape.

[0168] (2) In the above embodiment, the front end surfaces of the AC output terminal 11O of the inverter 11, the AC input terminal 21I and the AC output terminal 21O of the high-frequency transformer 21, the AC input terminal 22I and the AC output terminal 22O of the high-frequency transformer 22, and the AC input terminal 12I of the rectifier 12 constitute docking surfaces, but this is not limited to this. For example, it can also be as follows: one of the docking parts of the terminals that dock with each other is formed as a hole, and the other is formed as a rod that matches the above-mentioned hole in shape and size, and the docking is achieved by plugging the rod into the hole. In this case, the docking surface at least includes the inner peripheral surface of the docking part of one side and the outer peripheral surface of the docking part of the other side.

[0169] (3) In the above embodiment, the AC output terminal 11O of the inverter 11 and the AC input terminal 12I of the rectifier 12 are both arranged at the end away from the liquid cooling component 13, but it is not limited to this. Only one of the AC output terminal 11O and the AC input terminal 12I may be arranged at the end away from the liquid cooling component 13, or neither the AC output terminal 11O nor the AC input terminal 12I may be arranged at the end away from the liquid cooling component 13.

[0170] Furthermore, corresponding to the adjustment of the setting position of the AC output terminal 11O of the inverter 11 and the setting position of the AC input terminal 12I of the rectifier 12, the setting position of the AC input terminal 21I, the AC output terminal 21O of the high-frequency transformer 21 and / or the AC input terminal 22I, the AC output terminal 22O of the high-frequency transformer 22 can also be adjusted.

[0171] (4) In the above embodiment, the connection nut 21I2 is fixed to the AC input terminal 21I, but the present invention is not limited thereto. Instead of providing the connection nut 21I2, a thread may be directly formed in the connection hole 21I1 on the AC input terminal 21I. The same is true for the AC input terminal 22I, the AC output terminal 21O, and the AC output terminal 22O.

[0172] (5) In the above embodiment, the inverter 11 and the rectifier 12 are arranged with the liquid cooling component 13 sandwiched in the Z-axis direction, but this is not limited to this. The components of the inverter 11 and / or the rectifier 12 can also be arranged on both sides of the liquid cooling component 13 in the Z-axis direction.

[0173] (6) In the above embodiment, the inverter 11 and the rectifier 12 share one liquid cooling unit 13, but the present invention is not limited thereto, and separate liquid cooling units may be provided.

[0174] (7) In the above embodiment, two high-frequency transformers are provided, but the present invention is not limited thereto. One or more than three high-frequency transformers may also be provided. Of course, from the perspective of balancing the difficulty of high-frequency transformer design and the miniaturization of high-frequency DC / DC converter modules, two are preferred.

[0175] (8) In the above embodiment, the high frequency transformers 21 and 22 share one liquid cooling unit 23, but the present invention is not limited thereto, and separate liquid cooling units may be provided.

[0176] (9) The above equivalent circuit is only an example, and the present invention is not limited thereto. For example, the inverter circuit may be an asymmetric half-bridge or full-bridge, and the rectifier circuit may be a half-bridge.

[0177] (10) In the above embodiment, it is also possible to Fig. 9 As shown, other devices 3, such as resistors, light emitting diodes, etc., are arranged on the side of the liquid cooling assembly 23 of the transformer unit 2 opposite to the high-frequency transformers 21 and 22, so as to effectively utilize the idle space on the transformer unit 2.

Claims

1. A high-frequency DC / DC converter module for railway vehicles, used to convert the power from upstream and output it to downstream in an auxiliary power supply system, characterized in that: have: An inverter-rectifier unit, comprising an inverter, a rectifier, and a liquid cooling assembly for the inverter-rectifier unit for cooling the inverter and the rectifier; and A transformer unit, comprising a high-frequency transformer whose primary winding is electrically connected to the inverter and whose secondary winding is electrically connected to the rectifier, and a liquid cooling assembly for the transformer unit for cooling the high-frequency transformer; The inverter rectifying unit and the transformer unit are arranged in a first direction. The inverter has an inverter-side output docking portion disposed toward one side of the high-frequency transformer in the first direction, and the primary winding of the high-frequency transformer has a transformer-side input docking portion disposed toward one side of the inverter in the first direction. The rectifier has a rectifier-side input docking portion disposed toward one side of the high-frequency transformer in the first direction, and the secondary winding of the high-frequency transformer has a transformer-side output docking portion disposed toward one side of the rectifier in the first direction. The inverter-rectifier unit and the transformer unit are electrically connected by docking the inverter-side output docking portion with the transformer-side input docking portion and the rectifier-side input docking portion with the transformer-side output docking portion respectively along the first direction.

2. The high-frequency DC / DC converter module for railway vehicles according to claim 1, characterized in that: The inverter-side output docking portion and the transformer-side input docking portion and / or the rectifier-side input docking portion and the transformer-side output docking portion are fixed to each other by fasteners.

3. The high-frequency DC / DC converter module for railway vehicles according to claim 1, characterized in that: The butt joint surfaces of the inverter-side output butt joint portion and the transformer-side input butt joint portion and / or the butt joint surfaces of the rectifier-side input butt joint portion and the transformer-side output butt joint portion are formed into shapes that match each other.

4. The high-frequency DC / DC converter module for railway vehicles according to claim 1, characterized in that: The inverter-rectifier unit liquid cooling assembly is interposed between the inverter and the rectifier in a second direction intersecting the first direction.

5. The high-frequency DC / DC converter module for railway vehicles according to claim 4, characterized in that: The inverter-side output docking portion is disposed at an end away from the inverter-rectifier unit liquid cooling assembly at both ends of the inverter in the second direction. The transformer-side input docking portion and the inverter-side output docking portion are correspondingly arranged at one end portion of the high-frequency transformer in the second direction.

6. The high-frequency DC / DC converter module for railway vehicles according to claim 4 or 5, characterized in that: The rectifier-side input docking portion is disposed at an end away from the liquid cooling assembly for the inverter rectifier unit at both ends of the rectifier in the second direction. The transformer-side output docking portion and the rectifier-side input docking portion are correspondingly arranged at the other end portion of the high-frequency transformer in the second direction.

7. The high-frequency DC / DC converter module for railway vehicles according to claim 1, characterized in that: The transformer unit includes a plurality of high-frequency transformers. A plurality of high frequency transformers are connected in parallel between the inverter and the rectifier.

8. The high-frequency DC / DC converter module for railway vehicles according to claim 7, characterized in that: There are two high-frequency transformers.

9. A railway vehicle, characterized in that: have: A converter cabinet is formed with a plurality of cabinet spaces; and The high-frequency DC / DC converter module for railway vehicles according to any one of claims 1 to 8 is accommodated as a whole in one of the plurality of cabinet spaces.

10. The railway vehicle according to claim 9, characterized in that The compartment space is formed in a cylindrical shape having a bottom on one side in the width direction of the railway vehicle and an opening on the other side in the width direction. The high-frequency DC / DC converter module for railway vehicles is accommodated in the one compartment space in such a manner that the transformer unit is located on the bottom side in the width direction and the inverter rectifier unit is located on the opening side in the width direction.

Images