A plug-in power converter

Abstract

The application discloses a plug-in power converter, which comprises a direct current module, a power module, a first connector and a second connector. The direct current module comprises a capacitor busbar and a plurality of connectors. The power module comprises a mounting base and an input busbar. The input busbar can be electrically connected to the direct current module through the plug-in mode of the connectors. The first connector and the second connector are respectively fixed on the capacitor busbar of the direct current module and the mounting base of the power module, and can be plug-in matched in the front-back direction, so that the input busbar is guided to be inserted into the corresponding connector in a correct posture.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power converter, in particular to a plug-in power converter. BACKGROUND

[0002] The power converter is widely used in the fields of power system, rail transit, military industry, petroleum machinery, new energy vehicle, wind power generation, solar photovoltaic, etc. It is connected between the battery system and the power grid, and is used for realizing the bidirectional conversion of electric energy, controlling the charging and discharging process of the battery, converting AC and DC, and directly supplying power to AC load in the case of no power grid. At the same time, the NPC (Neutral Point Clamp) or ANPC (Active Neutral Point Clamp) three-level topology can use low blocking voltage IGBT devices to increase the DC bus voltage, thereby improving the AC output voltage and expanding the system power level, so it is widely used in power converters.

[0003] Conventionally, the power device in the power converter generally includes a DC assembly and a power assembly. The DC assembly includes a DC capacitor bank and a capacitor busbar, and the power assembly includes a power module and a heat sink. The power module is installed on the heat sink, and then connected with the DC busbar through an input bus.

[0004] Specifically, referring to Figure 1 which shows the structure of the power device in the prior art. The power device mainly includes a capacitor busbar 01, a DC capacitor bank 02, an input bus 03, a power tube group 04, an output bus 05, and a heat sink 06. The input bus 03, the power tube group 04, and the output bus 05 form the power module described above. The power module is installed on the heat sink 06, and the heat sink 06 is a forced air cooling heat sink with fins on the back, so the input bus 03, the power tube group 04, and the output bus 05 are all installed on the front face of the heat sink 06. Since the output of the power device is three-phase AC power, the power assembly includes three power modules and three corresponding heat sinks 06. Each power module is installed on a heat sink 06, and the input buses 03 in the three power modules are all connected to the capacitor busbar 01.

[0005] Furthermore, the capacitor busbar 01 includes positive plates, negative plates, and neutral plates, which are stacked and separated from each other by insulating plates. Correspondingly, the input bus 03 in each power module also includes positive plates, negative plates, and neutral plates, and is connected to the corresponding plates in the capacitor busbar 01. In the prior art, the input bus 03 and the capacitor busbar 01 are connected by bolt fastening. This connection method makes it inconvenient to install, disassemble, or maintain the power assembly in the power device. SUMMARY

[0006] The present application aims to overcome the above-mentioned defects or problems existing in the background art, and provide a plug-in power converter which can connect input banks with capacitor busbars in a correct posture by plug-in mode.

[0007] To achieve the above-mentioned purpose, the present application and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0008] A plug-in power converter comprises: a direct current module comprising capacitor busbars and a plurality of connectors; the connectors are fixed to the capacitor busbars, and each pole plate of each capacitor busbar corresponds to at least one connector; the connector is provided with a front-opening contact interface, and the contact interface is provided with a contact piece electrically connected to the pole plate of the capacitor busbar corresponding to the connector; at least one power module comprising a mounting base and an input bank fixed to the mounting base; the input bank comprises pole plates corresponding to the number and polarity of the capacitor busbars, and forms a corresponding relationship with each connector based on this; a first adapter fixed to the capacitor busbar and provided with at least one first adapter part; and a second adapter fixed to the mounting base and provided with a second adapter part corresponding to each first adapter part; the second adapter part is adapted to form a plug-in fit with the corresponding first adapter part in the front-back direction; each pole plate of the input bank is configured to extend into the contact interface of the corresponding connector and contact the contact piece in the contact interface to form an electrical connection between the input bank and the capacitor busbar when each second adapter part in the power module in which the pole plate is located is plugged into the corresponding first adapter part.

[0009] As a further technical solution, it further comprises a bending limiting member; each pole plate in the input bank is arranged in a stacked manner in the left-right direction, and at least one pole plate located at the outermost side is bent at the rear end thereof in a direction away from the positions of other pole plates, so that the pole plate sequentially forms a base part, a bending part and a plug-in part from front to back; the base part and the plug-in part both extend in the front-back direction, the bending part connects the base part and the plug-in part, and the plug-in part is adapted to extend into the contact interface of the corresponding connector; the bending limiting member is fixed to the mounting base and located outside the bent pole plate in the input bank, and is provided with a fixing part and a limiting part corresponding to the extension directions of the base part and the bending part of the bent pole plate, respectively, and the fixing part is in close contact with the corresponding base part, and the limiting part is in close contact with the corresponding bending part.

[0010] As a further technical solution, the second adapter is located behind the bending part of the bent pole plate in the input bank and is fixed to the limiting part of the bending limiting member in front of the bending part.

[0011] As a further technical solution, the input row includes three polar plates, wherein the rear ends of the polar plates located at the left and right sides are bent to form the bent portion and the insertion portion; corresponding to one input row, at least two second connecting members and two bent limiting members are provided, each second connecting member and the bent limiting member are correspondingly connected, and correspond to a bent polar plate.

[0012] As a further technical solution, in the power module, the input row is located at one side of the mounting base in the left-right direction, wherein the input row is located at the first side and the mounting base is located at the second side; the bent limiting member corresponding to the polar plate located at the second side of the input row is fixedly connected to the mounting base and is fixedly connected with the bent limiting member corresponding to the polar plate located at the first side of the input row to clamp the input row in the left-right direction.

[0013] As a further technical solution, the first connecting member is provided with an insertion hole with an opening facing forward for forming the first connecting portion, and the second connecting member is provided with an insertion column extending backward for forming the second connecting portion; each insertion column corresponds to the insertion hole and is adapted to form an insertion fit in the front-back direction; the hole of the insertion hole forms an inclined first guide surface, the end of the insertion column forms an inclined second guide surface, and the first guide surface and the second guide surface are adapted to cooperate with each other to guide the insertion of the insertion column into the corresponding insertion hole.

[0014] As a further technical solution, the rear end of each polar plate of the input row forms an inclined third guide surface, and the mouth of the contact interface of the connector forms an inclined fourth guide surface, and the third guide surface and the fourth guide surface are adapted to cooperate with each other to guide the insertion of each polar plate of the input row into the corresponding contact interface of the connector.

[0015] As a further technical solution, the direct current module further includes a fixing plate fixedly arranged behind the capacitor busbar; the first connecting member is located in front of the capacitor busbar and is fixedly connected with the fixing plate to clamp and fix the capacitor busbar.

[0016] As a further technical solution, further comprising a rack and a positioning member fixed to the rack; the positioning member is located between the DC module and the power module, and a first positioning structure is arranged on the side of the positioning member facing the DC module, and at least one second positioning structure is arranged on the side of the positioning member facing the power module, each second positioning structure corresponding to one power module; the first positioning structure and the second positioning structure each comprise two positioning plates arranged opposite in the left-right direction, and a positioning groove is formed between the two positioning plates; the DC module and the power module are provided with a positioning portion corresponding to the positioning groove in the first positioning structure and the second positioning structure, and the positioning portion is configured to be limited by the positioning groove to determine the position of the DC module and the power module relative to the rack in the left-right direction.

[0017] As a further technical solution, further comprising a sliding seat fixed to the rack; the sliding seat is provided with at least one sliding rail extending in the front-rear direction; each sliding rail corresponds to the number and position of the second positioning structure on the positioning member, and corresponds to one power module; the power module is provided with a sliding portion corresponding to the sliding rail, the sliding portion is adapted to slide along the sliding rail, and is limited by the sliding rail to determine the position of the power module relative to the rack in the left-right direction.

[0018] From the above description of the present application and its preferred embodiments, compared with the prior art, the technical solution of the present application and its preferred embodiments have the following beneficial effects due to the use of the following technical means:

[0019] Through continuous observation, experiment and research, the applicant knows that the reason for the technical problem of "the installation, disassembly or maintenance of the power module is relatively inconvenient" in the prior art is that the power module is connected to the capacitor busbar through bolt fastening, and the operation space of the power module in the converter is small, and the bolt fastening is relatively inconvenient for the operator.

[0020] In the related technical solution, a connector is arranged on the capacitor busbar of the DC module, the connector is provided with a contact interface, the contact interface is provided with a contact piece, the contact piece can be electrically connected with the polar plate on the corresponding capacitor busbar, when the power module is installed, each polar plate of the input row of the power module can be inserted into the corresponding contact interface in the front-rear direction, so that the input row forms an electrical connection with the corresponding polar plate on the capacitor busbar through the contact piece in the contact interface; this connection method makes the input row of the power module can be connected with the capacitor busbar of the DC module through direct plug-in, compared with the bolt fastening method, when using this connection method, the operator does not need to perform bolt fastening in a small space, and the installation, disassembly and maintenance of the power module are more convenient.

[0021] Further, the first and second docking members are provided, wherein the second docking member is fixedly arranged on the mounting base, and the first and second docking portions of the first and second docking members are capable of being insertedly matched in the front-rear direction, so that the input rows on the power module are guided to be inserted into the contact interfaces in the correct posture through the mutual cooperation of the first and second docking members; since the input rows are arranged on the mounting base and the input rows are made of metal material, the input rows may be bent during installation, which may cause the deviation of the positions of the input rows and the contact interfaces of the connector, and this deviation may cause the poles of the input rows to be unable to be inserted into the contact interfaces in the correct posture, and may cause the total contact area of the poles of the input rows and the contact pieces to be too small, which may cause the overcurrent area to be too small and the temperature of the contact pieces and the poles of the input rows to be abnormally high, and may also cause the force of the poles of the input rows to be concentrated on one or some contact pieces, which may cause the service life of the contact pieces to be reduced; under the guidance of the first and second docking members, since the second docking member is fixedly arranged on the mounting base and the input rows are fixedly arranged on the mounting base, the positions of the input rows and the mounting base are fixed, and the positions of the second docking member and the mounting base are also fixed, so that the poles of the input rows can be accurately inserted into the corresponding contact interfaces as long as the second docking member is accurately matched with the first docking member, and the normal connection of the input rows and the capacitor female rows is ensured; wherein, the second docking member is fixedly arranged on the mounting base instead of being fixedly arranged on the input rows or directly arranged on the input rows, which not only ensures the structural stability of the second docking member, but also avoids the stress damage to the input rows caused by the insertion matching of the first and second docking members; at the same time, compared with the input rows, the mounting base is not easy to be displaced and deformed, so that the position of the second docking member is also determined, thereby ensuring the relative positions of the second docking member and the input rows to be fixed.

[0022] In the related technical solutions and preferred embodiments thereof, the bending limiting member is provided, and the fixed portion and the limiting portion of the bending limiting member are correspondingly tightly attached to the base portion and the bending portion of the poles of the input rows, and the bending limiting member is fixedly arranged on the mounting base, so that the positions of the poles of the input rows are not easy to be displaced and the poles of the input rows are not easy to be deformed, thereby ensuring the relative positions of the poles of the input rows and the second docking member to be always fixed.

[0023] In the related technical solutions and preferred embodiments thereof, the second docking member is fixedly arranged on the mounting base through the bending limiting member, and the mounting position of the second docking member is just located at the position of the bending portion of the poles of the input rows, so as to cooperate with the bending limiting member to avoid the poles of the input rows from being deformed, thereby being closer to the insertion portion of the input rows and being capable of avoiding large errors.

[0024] In the related technical solution and the preferred embodiments thereof, the input row is provided with three polar plates, the rear ends of the polar plates located at the left and right sides are bent to form bending portions and plug-in portions, and the middle polar plate does not need to be bent, so that the rear ends of the three polar plates can be correspondingly connected with the connectors with a certain spacing, and mutual interference can be avoided; meanwhile, the second abutting members are arranged at the positions of the bending portions of the polar plates located at the left and right sides, and the two second abutting members can guide the process of inserting the three polar plates into the contact interfaces of the connectors.

[0025] In the related technical solution and the preferred embodiments thereof, the two bending limiting members can further cooperate with the three polar plates of the input row to further avoid deformation of the input row and ensure that the relative positions of the second abutting members and the input row are fixed.

[0026] In the related technical solution and the preferred embodiments thereof, the first abutting member is provided with a plug-in hole to form a first abutting portion, the second abutting member is provided with a plug-in column to form a second abutting portion, and the two cooperate to form plug-in cooperation in the front-rear direction; meanwhile, the first guide surface and the second guide surface are arranged to guide the process of inserting the plug-in column into the plug-in hole.

[0027] In the related technical solution and the preferred embodiments thereof, the polar plates of the input row and the contact interfaces of the connectors form corresponding third guide surfaces and fourth guide surfaces respectively, and the two cooperate with each other to facilitate guiding the polar plates of the input row to be accurately inserted into the contact interfaces of the connectors.

[0028] In the related technical solution and the preferred embodiments thereof, the fixed plate is arranged to facilitate installation of the connectors.

[0029] In the related technical solution and the preferred embodiments thereof, the positioning member fixed to the rack is arranged, the first positioning structure and the second positioning structure on the positioning member are both formed with positioning grooves, and the DC module and the power module can be limited by the positioning grooves in the left-right direction, so as to limit the positions of the DC module and the power module in the left-right direction, and even if the positioning tolerance of the positioning grooves to the DC module and the power module is large, the determination of the positions can lay a foundation for plug-in cooperation of the plug-in hole and the plug-in member.

[0030] In the related technical solution and the preferred embodiments thereof, the sliding seat fixed to the rack is arranged, the power module can slide along the slide rails on the sliding seat in the front-rear direction, and meanwhile the sliding seat can also limit the positions of the power module in the left-right direction, but the tolerance of the limitation of the positions is large, and the power module also needs to cooperate with the positioning member, the plug-in hole and the plug-in member to ensure that the polar plates of the input row extend into the corresponding contact interfaces in a correct posture. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description are briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0032] Figure 1 Part of the structure of the converter in the prior art described in the background section of the present application;

[0033] Figure 2 Part of the structure of the plug-in power converter provided by the embodiments of the present application Figure 1 ;

[0034] Figure 3 Structure of the DC module in the plug-in power converter provided by the embodiments of the present application;

[0035] Figure 4 Structure of the power module in the plug-in power converter provided by the embodiments of the present application Figure 1 ;

[0036] Figure 5 Part of the structure of the plug-in power converter provided by the embodiments of the present application Figure 2 ;

[0037] Figure 6 Structure of part A in Figure 5 ;

[0038] Figure 7 Structure of part B in Figure 5 ;

[0039] Figure 8 Part of the structure of the DC module in Figure 3 ;

[0040] Figure 9 Structure of part C in Figure 8 ;

[0041] Figure 10 Structure of part D in Figure 4 ;

[0042] Figure 11 Structure of the power module in the plug-in power converter provided by the embodiments of the present application Figure 2 ;

[0043] Figure 12 Structure of part E in Figure 11 .

[0044] Main drawing mark explanation:

[0045] Direct current module 10; capacitor busbar 11; connector 12; contact surface 121; fourth guide surface 122; first connecting piece 13; first connecting part 131; first guide surface 132; accommodation slot 133; polar plate slot 134; contact piece 14; fixed plate 15;

[0046] Power module 20; mounting base 21; input busbar 22; input positive plate 221; input neutral plate 222; input negative plate 223; third guide surface 224; power tube group 23; output busbar 24; base 25; bending part 26; plug-in part 27;

[0047] Second connecting piece 30; second connecting part 31; connecting main body 32; second guide surface 33;

[0048] Frame 40;

[0049] Positioning piece 50; first positioning structure 51; second positioning structure 52; positioning plate 53; positioning slot 54; positioning base 55;

[0050] Sliding seat 60; sliding rail 61;

[0051] Positioning part 71; sliding part 72;

[0052] Bending limiting piece 80; fixed part 81; limiting part 82. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusive to other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0054] In the claims, specification and above drawings of the present application, unless otherwise explicitly defined, the terms such as "first", "second" or "third" are used only to distinguish different objects, and are not used to describe a specific order.

[0055] In the claims, the specification, and the drawings of the present application, terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are used as terms of reference and are not intended to limit the present application to any particular spatial orientation or configuration. Therefore, such terms are used merely for the purpose of assisting in the description of the present application and simplifying the reading thereof, and are not intended to limit or imply the specific orientation or configuration of the apparatus or elements thereof as claimed, and should not be so construed unless specifically stated.

[0056] In the claims, the specification, and the drawings of the present application, unless otherwise expressly specified, terms such as "fixedly connected" or "fixedly connected" should be interpreted broadly, i.e. any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0057] In the claims, the specification, and the drawings of the present application, the terms "include", "have" and their variants are intended to mean "include but not limited to".

[0058] The embodiment of the present application provides a plug-in power converter, which is based on a conventional converter circuit and control method, and is used for realizing bidirectional conversion of AC and DC power. The embodiment does not improve the basic circuit and the like, and therefore, the part is not described again.

[0059] Referring to Figure 2 The power converter comprises a rack 40, a DC module 10, a power module 20, a positioning piece 50, a sliding seat 60, and a first docking piece 13. Referring to Figure 10 and Figure 11 The power converter further comprises a second docking piece 30 and a bending limiting piece 80.

[0060] The rack 40 is used for fixedly mounting the DC module 10, the power module 20, the positioning piece 50, the sliding seat 60 and the first docking piece 13, and can be designed based on actual needs. Herein, the structure thereof is not limited too much, but it should be able to meet the following requirements: after the above components are installed, the DC module 10 is located in front of the power module 20, the positioning piece 50 is located between the DC module 10 and the power module 20, and the sliding seat 60 is located below the DC module 10.

[0061] Referring to Figure 3The direct current module 10 mainly comprises a direct current capacitor cell and a capacitor busbar 11. A plurality of connectors 12 and a plurality of first connecting members 13 are fixedly arranged on the front side of the capacitor busbar 11, and a fixing plate 15 is fixedly arranged on the rear side of the capacitor busbar 11. Figure 4 The power module 20 mainly comprises a mounting base 21, a power tube group 23, an input busbar 22 and an output busbar 24. The mounting base 21 is a heat sink in the embodiment, the power tube group 23 is an IGBT switch tube, and the input busbar 22 and the output busbar 24 are copper busbars. In the embodiment, three power modules 20 are arranged, and one power module 20 corresponds to one phase of three-phase alternating current output. However, in other embodiments, other numbers of power modules 20 can be used, for example, the power tube groups 23 required by three-phase alternating current output can be arranged on one power module 20, so that only one power module 20 and a corresponding set of input busbars 22 are required, or multiple sets of three-phase alternating current output are required, and a corresponding set of power modules 20 is arranged.

[0062] Referring to Figure 5 The rack 40 comprises two straight rods arranged along the left-right direction and extending along the up-down direction. The positioning member 50 is a horizontal rod horizontally arranged between the two straight rods, and the two ends of the positioning member 50 are fixed to the two straight rods by bolts. The side of the positioning member 50 facing the direct current module 10 is provided with a first positioning structure 51, and the side of the positioning member 50 facing the power module 20 is provided with at least one second positioning structure 52, each second positioning structure 52 corresponding to one power module 20. In the embodiment, the number of second positioning structures 52 is three corresponding to the three power modules 20.

[0063] Referring to Figure 5 and Figure 6 The first positioning structure 51 and the second positioning structure 52 each comprise two positioning plates 53 arranged opposite to each other along the left-right direction, and a positioning groove 54 is formed between the two positioning plates 53. Specifically, in the first positioning structure 51, one positioning plate 53 is arranged at the position close to each of the left and right ends of the positioning member 50. The positioning plate 53 is in an “L” shape and is fixedly connected to the rear side surface of the horizontal rod forming the main body of the positioning member 50 by screwing or welding. The long side of the positioning plate 53 extends rearward. The two positioning plates 53 are matched to form a positioning groove 54 between the long sides of the two positioning plates 53. Similarly, in the second positioning structure 52, a positioning groove 54 is formed by two positioning plates 53 according to the position of the corresponding power module 20. Since the size of the power module 20 corresponding to the second positioning structure 52 is small, the distance between the two side walls of the positioning groove 54 in the second positioning structure 52 is also small.

[0064] Meanwhile, referring to Figure 3The left and right sides of the direct current module 10 are formed with positioning portions 71 corresponding to the positioning grooves 54 in the first positioning structure 51, that is, the outer edge surfaces of the left and right sides of the direct current module 10 can be matched with the two positioning plates 53 in the first positioning structure 51. When the direct current module 10 is installed, the positioning portions 71 of the direct current module 10 are inserted into the positioning grooves 54 of the first positioning structure 51 correspondingly, and the positioning portions 71 are limited by the positioning grooves 54 to determine the positions of the direct current module 10 relative to the rack 40 in the left and right directions. Specifically, before the direct current module 10 is installed, the positioning member 50 is first fixedly installed on the rack 40, and the first positioning structure 51 faces the rear of the rack 40. Then, the direct current module 10 is positioned by the first positioning structure 51 of the positioning member 50, and then the direct current module 10 is fixedly installed on the rack 40 by screwing or the like.

[0065] Correspondingly, referring to Figure 4 Similar to the direct current module 10, the left and right sides of each power module 20 are also formed with positioning portions 71. Specifically, the positioning portions 71 are formed on the mounting base 21 of the power module 20, that is, on the main body of the radiator of the power module 20. The positioning portions 71 on the power module 20 can be matched with the two positioning plates 53 in the corresponding second positioning structure 52, so as to determine the positions of the power module 20 relative to the rack 40 in the left and right directions. Specifically, when the power module 20 is installed, the power module 20 is positioned by the corresponding second positioning structure 52, and then the direct current module 10 is fixedly installed relative to the rack 40 by screwing or the like.

[0066] Referring to Figure 5 and Figure 7 The rack 40 is also provided at the bottom with a plurality of horizontal rods, and the sliding seats 60 are fixedly installed on the horizontal rods. The sliding seat 60 is provided with a sliding rail 61 extending in the front and back directions, and each sliding rail 61 corresponds to the number and positions of the second positioning structures 52 on the positioning member 50 and corresponds to a power module 20. In this embodiment, there are three sliding seats 60, and the positions of the sliding rails 61 on each sliding seat 60 correspond to a second positioning structure 52. Meanwhile, referring to Figure 4 The bottom of the power module 20 is provided with a sliding portion 72 corresponding to the sliding rail 61, and the sliding portion 72 is adapted to slide along the sliding rail 61 and is limited by the sliding rail 61 to determine the positions of the power module 20 relative to the rack 40 in the left and right directions.

[0067] It should be understood that due to the limitation of the manufacturing process, the position of the power module 20 can only be roughly limited by the cooperation of the sliding rail 61 and the sliding portion 72, and therefore the positions of the direct current module 10 and the power module 20 need to be determined by the positioning member 50 at the same time, so as to reduce the error of the relative positions between the power module 20 and the direct current module 10.

[0068] Referring to Figure 3 A plurality of connectors 12 are mounted on the DC module 10, and each of the plates of the capacitor busbar 11 corresponds to at least one connector 12. Specifically, referring to Figure 8 and Figure 9 The capacitor busbar 11 of the DC module 10 includes three plates corresponding to the positive, negative and neutral, respectively, and the three plates are stacked and connected to the input power supply through the terminal row at the lower end. As known, the converter is used to realize the bidirectional conversion between DC and AC, so the DC module 10 needs to be connected to the power module 20, and the electrical connection between the DC module 10 and the power module 20 is realized by the connector 12 in the embodiment. The converter provided in the embodiment includes three groups of power modules 20, and each power module 20 is connected to the three plates of the capacitor busbar 11 through three connectors 12. Here, referring to Figure 8 The three connectors 12 corresponding to each power module 20 are determined as the positive connector 12, the neutral connector 12 and the negative connector 12, respectively, and are connected to the positive plate, the neutral plate and the negative plate of the capacitor busbar 11, respectively.

[0069] Specifically, referring to Figure 9 The connector 12 is provided with a contact interface 121 with an opening facing forward, and the contact interface 121 is a long slot extending in the upward and downward direction, and the contact interface 121 is provided with a contact piece 14 electrically connected to the plate of the capacitor busbar 11 corresponding to the connector 12. Taking the positive connector 12 as an example, the contact piece 14 in the positive connector 12 is electrically connected to the positive plate of the capacitor busbar 11. Further, the connector 12 can be a contact finger connector 12, and the metal sheet in the contact finger connector 12 forms the contact piece 14 described above; or the contact piece 14 in the connector 12 can be a spring metal sheet, which is arranged along the extension direction of the contact interface 121 and can be in contact with the input row 22 on the power module 20 to conduct electricity. The mouth of the contact interface 121 forms an inclined fourth guide surface 122, and the inclined direction of the fourth guide surface 122 is inclined from the outside of the contact interface 121 to the inside of the contact interface 121.

[0070] Referring to Figure 4 The input row 22 of the power module 20 is fixedly installed at the upper position of the mounting base 21; and referring to Figure 10The input row 22 includes polar plates corresponding to the number and polarity of the capacitor busbar 11, which are input positive polar plate 221, input neutral polar plate 222 and input negative polar plate 223 respectively. The polar plates of the input row 22 are based on the corresponding relationship with the polar plates in the capacitor busbar 11, and also form a corresponding relationship with the connector 12. Specifically, the positive input plate is connected with the positive connector 12, the neutral input plate is connected with the neutral connector 12, and the negative input plate is connected with the negative connector 12. The input row 22 of the power module 20 is connected with the capacitor busbar 11 through the connector 12. Specifically, referring to Figure 8 The rear of the capacitor busbar 11 is provided with a fixed plate 15, and the connector 12 is located in front of the capacitor busbar 11 and is fixedly connected with the fixed plate 15 to be clamped and fixed to the capacitor busbar 11. Specifically, the connector 12 and the fixed plate 15 can be clamped by being screwed with the capacitor busbar 11, so that the connector 12 is fixed on the capacitor busbar 11.

[0071] Specifically, referring to Figure 10 The rear end of each polar plate of the input row 22 is a flat plate suitable for extending into the corresponding touch interface 121. The flat plate structure can be adapted to the long slot-shaped touch interface 121, and can increase the contact area between the input row 22 and the contact piece 14 in the connector 12, facilitating the conduction of large current. In addition, the contact area between the neutral polar plate, i.e. the input neutral plate 222, and the contact piece 14 in the corresponding touch interface 121 is greater than that between the other two polar plates and the contact piece 14 in the corresponding touch interface 121, thereby improving the current carrying capacity of the input neutral plate 222. And, referring to Figure 10 The rear end of each polar plate of the input row 22 forms an inclined third guide surface 224, and the third guide surface 224 and the fourth guide surface 122 on the connector 12 are adapted to cooperate with each other to guide the insertion of each polar plate of the input row 22 into the touch interface 121 of the corresponding connector 12.

[0072] In addition, since the rear end of each polar plate of the input row 22 needs to be connected with each connector 12, and there is a certain distance between the connectors 12, and the polar plates of the input row 22 are in a stacked state at the position connected with the power tube group 23, part of the polar plates of the input row 22 form a shape of multiple bends at the rear. Specifically, referring to Figure 10, the input row 22 is arranged in a stacked manner in the left-right direction, and at least one of the outermost end of the polar plate is bent towards the direction away from the position of other polar plates, so that the polar plate is sequentially formed by the base 25, the bending part 26 and the plug-in part 27 from front to back; the base 25 and the plug-in part 27 are extended in the front-back direction, the bending part 26 connects the base 25 and the plug-in part 27, and the plug-in part 27 is suitable for extending into the contact interface 121 of the corresponding connector 12. Specifically, the rear end of the polar plate on the left side and the right side is bent to form the bending part 26 and the plug-in part 27, that is, the rear end of the positive input plate and the negative input plate is bent to form the bending part 26 and the plug-in part 27. The plug-in part 27 of the positive input plate and the negative input plate can be inserted into the contact interface 121 of the corresponding connector 12, and the rear end of the neutral input plate can also be regarded as forming the plug-in part 27, but the neutral input plate is not bent like the positive input plate or the negative input plate, and the neutral input plate can be separated from the other two plug-in parts 27 by bending the positive input plate and the negative input plate.

[0073] Referring to Figure 11 and Figure 12 , the bending limiting part 80 is fixed to the mounting base 21 and is not outside the bent polar plate in the input row 22, which is provided with a fixed part 81 and a limiting part 82 corresponding to the extension direction of the base 25 and the bending part 26 of the bent polar plate, respectively, and the fixed part 81 is in close contact with the corresponding base 25, and the limiting part 82 is in close contact with the corresponding bending part 26. In addition, in the power module 20, the input row 22 is located on one side of the mounting base 21 in the left-right direction, wherein the input row 22 is located on the first side, the mounting base 21 is located on the second side, and the bending limiting part 80 corresponding to the polar plate on the second side in the input row 22 is fixed to the mounting base 21, and the bending limiting part 80 corresponding to the polar plate on the first side in the input row 22 is fixed to cooperate to clamp the input row 22 in the left-right direction. In this embodiment, the input row 22 is located on the left side, and the mounting base 21 is located on the right side.

[0074] The number of the bending limiting piece 80 is two, which correspond to the positive input plate and the negative input plate respectively, and it is an "L" shaped component, two edges of which form a fixing part 81 and a limiting part 82 respectively. Among them, the fixing part 81 of the bending limiting piece 80 on the right side is fastened with the mounting base 21 through a bolt, the fixing part 81 of the bending limiting piece 80 on the left side is connected with the fixing part 81 of the bending limiting piece 80 on the right side through a bolt, and the bolt passes through the three pole plates of the input row 22 between the two, so that the two bending limiting pieces 80 can cooperate to clampingly fix the input row 22. The limiting part 82 of the bending limiting piece 80 on the left side is close to the bending part 26 of the positive input plate and located in front of it, and the second connecting piece 30 is installed and fixed behind the bending part 26 of the positive input plate through a bolt; the limiting part 82 of the bending limiting piece 80 on the right side is close to the bending part 26 of the negative input plate and located in front of it, and the other second connecting piece 30 is installed and fixed behind the bending part 26 of the negative input plate through a bolt. Through the bending limiting piece 80, the structural stability of the pole plates of the input row 22 can be increased, and each pole plate is not easy to deform, especially in the case that the input row 22 and the connector 12 are connected through plug-in cooperation, each pole plate is not easy to deform in the transportation process, the installation process and the plug-in process, so as to ensure the accurate correspondence between the position of each pole plate of the input row 22 and the connector 12.

[0075] In actual use, the power module 20 can be placed in the slide rail 61 of the sliding seat 60 first, and the power module 20 is pushed towards the direct current module 10, and the power module 20 will fall into the second positioning structure 52, and at the same time, each pole plate of the input row 22 can be correspondingly inserted into each connector 12, so that the power module 20 and the direct current module 10 are electrically connected through plug-in cooperation, without the need for locking by bolts and the like, and the operation convenience is greatly improved. However, due to the manufacturing process, the slide rail 61 of the sliding seat 60 and the positioning structure of the positioning piece 50 cannot guarantee that each pole plate of the input row 22 can contact the contact piece 14 in the contact interface 121 after being inserted into the contact interface 121. For example, if the pole plate of the input row 22 is slightly inclined, it can be inserted into the contact interface 121, but it will exert excessive pressure on the contact piece 14, causing uneven stress on the contact piece 14, thereby shortening the service life of the contact piece 14; or the contact area between the pole plate of the input row 22 and the contact piece 14 is too small, which causes easy overheating when delivering large current.

[0076] Therefore, referring to Figure 8 and Figure 9 , a first connecting piece 13 is installed and fixed on the front side surface of the capacitor busbar 11; and referring to Figure 4 and Figure 10 , a corresponding second connecting piece 30 is fixed and installed on the mounting base 21.

[0077] Referring to Figure 9 , the first connecting member 13 is provided with at least one first connecting portion 131; referring to Figure 10 , the second connecting member 30 is provided with a second connecting portion 31 corresponding to each first connecting portion 131; the second connecting portion 31 is adapted to form a plug-in fit with the corresponding first connecting portion 131 in the front-rear direction; at the same time, each pole plate of the input row 22 is configured to extend into the contact interface 121 of the corresponding connector 12 and contact the contact piece 14 in the contact interface 121 to form an electrical connection between the input row 22 and the capacitor busbar 11 when each said second connecting portion 31 in the power module 20 where it is located is plugged into fit with the corresponding each said first connecting portion 131.

[0078] Specifically, referring to Figure 8 , three first connecting members 13 are provided on the capacitor busbar 11, corresponding to three power modules, and three connectors 12 corresponding to each power module are arranged near the first connecting member 13. Among them, two connectors 12 are arranged on the left and right sides of the first connecting member 13 respectively, and one connector 12 is also arranged at the middle position of the first connecting member 13. For this purpose, a clearance slot 133 is arranged at the middle position of the first connecting member 13, which allows the connector 12 to be installed at the middle of the first connecting member 13. According to the polarity order of the pole plates of the input row 22, the positive connector 12 is located on the left side of the first connecting member 13, the negative connector 12 is located on the right side of the first connecting member 13, and the neutral connector 12 is located at the middle position of the first connecting member 13. Since the contact area of the contact piece 14 in the neutral connector 12 corresponds to the neutral input plate is larger, two pole plate slots 134 are also arranged at the upper and lower positions corresponding to the clearance slot 133 of the first connecting member 13, the openings of the two pole plate slots 134 face forward and can accommodate the neutral input plate. The first connecting member 13 is provided with two first connecting portions 131 on the left and right sides of the clearance slot 133, and in this embodiment, the first connecting portion 131 is a plug-in hole, and the hole of the plug-in hole forms an inclined first guide surface 132.

[0079] Correspondingly, referring to Figure 10In the embodiment, two second connecting members 30 are provided corresponding to one first connecting member 13, and each second connecting member 30 is provided with a second connecting portion 31. The two second connecting members 30 are respectively mounted on the rear side surface of the bent portion 26 of the positive input plate and the negative input plate, and are fixed by being screwed with the corresponding bent limiting portion 82. In the embodiment, the second connecting member 30 comprises a connecting body 32, the connecting body 32 abuts against the rear side surface of the bent portion 26 of the corresponding plate and is screwed with the corresponding bent limiting portion 82, and the rear side surface of the connecting body 32 extends rearward to form a plug-in column, the plug-in column is used to form the second connecting portion 31 of the second connecting member 30, and the end of the plug-in column is provided with an inclined second guide surface 33. The first guide surface 132 and the second guide surface 33 are adapted to cooperate with each other to guide the plug-in column to be inserted into the corresponding plug-in hole.

[0080] The first connecting member 13 and the second connecting member 30 can be made of plastic material, and the plastic material can be an engineering plastic with high hardness and good performance. The use of plastic material can reduce the weight of the first connecting member 13 and the second connecting member 30, and avoid damage to the capacitor busbar 11 or the input busbar 22 due to self-weight.

[0081] The plug-in power converter provided by the embodiment is provided with a connector 12 on the capacitor busbar 11 of the DC module 10, the connector 12 is provided with a contact interface 121, the contact interface 121 is provided with a contact piece 14, the contact piece 14 can be electrically connected with the pole plate on the corresponding capacitor busbar 11, when the power module 20 is installed, the pole plates of the input row 22 of the power module 20 can be inserted into the corresponding contact interface 121 along the front and back directions, so that the input row 22 forms the electrical connection with the corresponding pole plate on the capacitor busbar 11 through the contact piece 14 in the contact interface 121; the connection mode makes the input row 22 of the power module 20 can be connected with the capacitor busbar 11 of the DC module 10 through the direct plug-in mode, compared with the bolt locking mode, when the connection mode is used, the staff does not need to lock the bolt in the small space, the installation, disassembly and maintenance of the power module 20 are more convenient. In addition, the first docking piece 13 and the second docking piece 30 are also provided, the second docking piece 30 is fixedly arranged on the installation base body 21, the first docking part 131 and the second docking part 31 of the two can form the plug-in cooperation along the front and back directions, so that the pole plates of the input row 22 on the power module 20 are guided to be inserted into the contact interface 121 in the accurate posture through the mutual cooperation of the first docking piece 13 and the second docking piece 30; since the input row 22 is installed on the installation base body 21, and the input row 22 is made of metal material, the input row 22 may be bent during the installation, so that the position of the input row 22 deviates from the position of the contact interface 121 of the connector 12, the deviation may cause the pole plates of the input row 22 to be unable to be inserted into the contact interface 121 in the correct posture, according to different arrangement modes of the contact piece 14, the total contact area of the pole plates of the input row 22 and the contact piece 14 may be too small, so that the overcurrent area of the current is too small, which may easily cause the temperature of the contact piece 14 and the pole plates of the input row 22 to be abnormally high, and may also cause the force of the pole plates of the input row 22 to be concentrated on one or some contact pieces 14, so that the service life of the contact piece 14 is reduced; under the guidance of the first docking piece 13 and the second docking piece 30, since the second docking piece 30 is fixedly arranged on the installation base body 21, and the input row 22 is fixedly arranged on the installation base body 21, the position of the input row 22 and the installation base body 21 is fixed, and the position of the second docking piece 30 and the installation base body 21 is also fixed, as long as the second docking piece 30 can accurately cooperate with the first docking piece 13, the pole plates of the input row 22 can be accurately inserted into the corresponding contact interface 121, and the normal connection of the input row 22 and the capacitor busbar 11 is ensured.The second connecting piece 30 is fixed to the mounting base 21 instead of being fixed to the input row 22 or directly arranged on the input row 22, which not only ensures the structural stability of the second connecting piece 30, but also avoids stress damage to the input row 22 caused by the plug-in cooperation between the second connecting piece 30 and the first connecting piece 13. Meanwhile, compared with being arranged on the input row 22, the mounting base 21 is not easy to be displaced and deformed, and therefore the position of the second connecting piece 30 is also determined, so as to ensure the relative position between the second connecting piece 30 and the input row 22.

[0082] The above description and the embodiment of the specification are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application. Through the inspiration of the present application or the above embodiment, the modification, equivalent replacement or other improvement of the embodiment of the present application or one component technical feature thereof obtained by the ordinary skilled in the art combining with the common knowledge, the ordinary technical knowledge in the art and / or the prior art through logical analysis, reasoning or limited test should be included in the protection scope of the present application.

Claims

1. A plug-in power converter, comprising: a DC module (10) comprising a capacitor busbar (11) and a plurality of connectors (12); each of the connectors (12) is fixed to the capacitor busbar (11), and each of the polar plates of the capacitor busbar (11) corresponds to at least one of the connectors (12); each of the connectors (12) is provided with a front opening contact interface (121), and the contact interface (121) is provided with a contact piece (14) electrically connected to the polar plate of the capacitor busbar (11) corresponding to the connector (12); at least one power module (20) comprising a mounting base (21) and an input busbar (22) fixed to the mounting base (21); the input busbar (22) comprises polar plates corresponding to the number and polarity of the capacitor busbar (11), and forms a corresponding relationship with each of the connectors (12); and a first docking member (13) fixed to the capacitor busbar (11) and provided with at least one first docking part (131); and a second docking member (30) fixed to the mounting base (21) and provided with a second docking part (31) corresponding to each of the first docking parts (131); the second docking part (31) is adapted to form a plug-in fit with the corresponding first docking part (131) in the front-back direction; each of the polar plates of the input busbar (22) is configured to extend into the contact interface (121) of the corresponding connector (12) and contact the contact piece (14) in the contact interface (121) to form an electrical connection between the input busbar (22) and the capacitor busbar (11) when the second docking part (31) in the power module (20) where the polar plate is located is plugged into the corresponding first docking part (131); the rear end of each of the polar plates of the input busbar (22) forms an inclined third guide surface (224), and the mouth of the contact interface (121) of the connector (12) forms an inclined fourth guide surface (122), and the third guide surface (224) and the fourth guide surface (122) are adapted to cooperate with each other to guide the insertion of each of the polar plates of the input busbar (22) into the contact interface (121) of the corresponding connector (12); further comprising a bending limiting member (80); each of the polar plates of the input busbar (22) is arranged in a stacked manner in the left-right direction, and the rear end of at least one polar plate located at the outermost side is bent towards a direction away from the positions of the other polar plates, so that the polar plate sequentially forms a base (25), a bending part (26) and a plug-in part (27) from front to back; the base (25) and the plug-in part (27) both extend in the front-back direction, the bending part (26) connects the base (25) and the plug-in part (27), and the plug-in part (27) is adapted to extend into the contact interface (121) of the corresponding connector (12). ​ ​ ​ ​ ​ ​ ​ 2. A plug-in power converter as claimed in claim 1, characterized in that ​ ​ The bending limiting piece (80) is fixed on the mounting base (21) and located outside the bent plate in the input row (22), and is provided with a fixed part (81) and a limiting part (82) corresponding to the extending direction of the base (25) and the bending part (26) of the bent plate respectively, and the fixed part (81) is in close contact with the corresponding base (25), and the limiting part (82) is in close contact with the corresponding bending part (26).

3. A plug-in power converter as claimed in claim 2, characterized in that The second connecting piece (30) is located behind the bending part (26) of the bent plate in the input row (22) and is fixed with the limiting part (82) of the bending limiting piece (80) in front of the bending part (26).

4. A plug-in power converter as claimed in claim 3, characterized in that The input row (22) includes three plates, wherein the rear end of the plates on the left and right sides is bent to form the bending part (26) and the plug-in part (27); corresponding to one input row (22), at least two second connecting pieces (30) and two bending limiting pieces (80) are provided, each second connecting piece (30) and a bending limiting piece (80) are correspondingly connected, and correspond to one bent plate.

5. A plug-in power converter as claimed in claim 4, characterized in that In the power module (20), the input row (22) is located on one side of the mounting base (21) in the left-right direction, wherein the input row (22) is located on the first side, and the mounting base (21) is located on the second side; the bending limiting piece (80) corresponding to the plate on the second side in the input row (22) is fixed on the mounting base (21), and is fixed with the bending limiting piece (80) corresponding to the plate on the first side in the input row (22) to clamp the input row (22) in the left-right direction.

6. A plug-in power converter as claimed in claim 5, characterized in that The first connecting piece (13) is provided with a plug-in hole with an opening facing forward to form the first connecting part (131), and the second connecting piece (30) is provided with a plug-in column extending backward to form the second connecting part (31); each plug-in column corresponds to a plug-in hole and is adapted to form a plug-in fit in the front-back direction; the hole of the plug-in hole forms an inclined first guide surface (132), and the end of the plug-in column forms an inclined second guide surface (33), and the first guide surface (132) and the second guide surface (33) are adapted to cooperate with each other to guide the plug-in column to be inserted into the corresponding plug-in hole.

7. A plug-in power converter as claimed in claim 6, characterized in that The direct current module (10) further includes a fixed plate (15) fixed behind the capacitor bus (11); the first connecting piece (13) is located in front of the capacitor bus (11) and is fixed with the fixed plate (15) to clamp and fix the capacitor bus (11).

8. A plug-in power converter according to any one of claims 1-7, characterized in that Further comprising a rack (40) and a positioning member (50) fixed to the rack (40); the positioning member (50) is located between the direct current module (10) and the power module (20), and a first positioning structure (51) is arranged on the side of the positioning member (50) facing the direct current module (10), and at least one second positioning structure (52) is arranged on the side of the positioning member (50) facing the power module (20), each second positioning structure (52) corresponding to one power module (20); the first positioning structure (51) and the second positioning structure (52) are both composed of two positioning plates (53) oppositely arranged in the left-right direction, and a positioning groove (54) is formed between the two positioning plates (53); the direct current module (10) and the power module (20) are provided with a positioning part (71) corresponding to the positioning groove (54) in the first positioning structure (51) and the second positioning structure (52), and the positioning part (71) is configured to be limited by the positioning groove (54) to determine the position of the direct current module (10) and the power module (20) relative to the rack (40) in the left-right direction.

9. A plug-in power converter as claimed in claim 8, characterized in that Further comprising a sliding seat (60) fixed to the rack (40); the sliding seat (60) is provided with at least one sliding rail (61) extending in the front-back direction; each sliding rail (61) corresponds to the number and position of the second positioning structure (52) on the positioning member (50), and corresponds to one power module (20); the power module (20) is provided with a sliding part (72) corresponding to the sliding rail (61), the sliding part (72) is adapted to slide along the sliding rail (61), and is limited by the sliding rail (61) to determine the position of the power module (20) relative to the rack (40) in the left-right direction.

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