CN117879305A - Power assembly and converter - Google Patents

Abstract

The invention discloses a power component and a current transformer, wherein the power component comprises: the radiator is provided with a mounting surface, and a plurality of fixing parts are convexly arranged on the mounting surface; the wiring part comprises wiring rows which are locked and fixed on the radiator through the fixing parts; and a plurality of switching devices fixed to the mounting surface; the switch device comprises a switch body and a plurality of wiring terminals exposed out of the switch body; the switch body is provided with a semiconductor part and an elastic conductive piece; the elastic conductive piece is electrically connected with the semiconductor part and the wiring terminal, and defines a first direction and a second direction which are perpendicular to each other according to the elastic deformation direction of the elastic conductive piece, and the elastic conductive piece is suitable for buffering the wiring stress from the wiring terminal to the semiconductor part in the first direction and the second direction; the plurality of wiring terminals on the switching device are sequentially arranged along the second direction; the first direction is perpendicular to the mounting surface. The power assembly can relieve stress of the wiring part on the wiring terminal on the switching device from being transferred to the semiconductor part in the switching device.

Description

Power assembly and converter

Technical Field

The invention relates to the technical field of converters, in particular to a power component and a converter.

Background

The converter is widely applied to the fields of power systems, rail transit, military industry, petroleum machinery, new energy automobiles, wind power generation, solar photovoltaic and the like, is connected between a battery system and a power grid, is used for realizing bidirectional conversion of electric energy, can control charging and discharging processes of a storage battery, performs alternating current-direct current conversion, and can directly supply power for alternating current loads under the condition of no power grid. Meanwhile, the NPC (Neutral Point Clamp) type or ANPC (Active Neutral Point Clamp) type three-level topology can utilize IGBT devices with low blocking voltage to improve the voltage of a direct current bus, further improve the alternating current output voltage and enlarge the power class of a system, and therefore the direct current bus is widely applied to converters.

Conventionally, a converter mainly includes a power component, and the power component is used for implementing bidirectional conversion of direct current and alternating current. The power module in the converter generally comprises a direct current module and a power module, wherein the direct current module mainly comprises a direct current capacitor pool and a capacitor busbar, the power module mainly comprises a power tube group and a radiator, and the power tube group is arranged on the radiator and is connected with the direct current busbar through an input row. In particular, referring to fig. 1, a prior art power module configuration in a current transformer is shown. The power assembly may include a capacitor busbar 01, a dc capacitor cell 02, an input busbar 03, a power bank 04, an output busbar 05, and a heat sink 06. The input row 03, the power tube group 04 and the output row 05 form the power module, the power tube group 04 is mounted on the radiator 06, the radiator 06 adopts an air-cooled radiator, and the back of the radiator is provided with radiating fins, so that the input row 03, the power tube group 04 and the output row 05 are mounted on the front surface of the radiator 06. Because the output of the power device is three-phase alternating current, the power module comprises three power tube groups 04 and three corresponding heat radiators 06, each power tube group 04 is arranged on one heat radiator 06, and the input rows 03 in the three power modules are connected to the capacitor busbar 01. Further, the capacitor busbar 01 comprises a positive plate, a negative plate and a neutral plate, which are stacked and separated from each other by an insulating plate; correspondingly, the input row 03 in each power module also comprises a positive plate, a negative plate and a neutral plate, and is correspondingly connected with each polar plate in the capacitor busbar 01.

Referring to fig. 2, a circuit diagram of a prior art three-level topology is shown. For the power components adopting the three-level topology structure, the power tube group 04 generally includes three IGBT devices in each complete three-level topology structure, corresponding to the circuit shown in fig. 2, the tubes 1 and 2 are input tubes, the tubes 3 and 4 are input tubes, and the tubes 5 and 6 are output tubes. The first end of the tube 1 is connected with the positive plate of the capacitor busbar, the first end of the tube 2 is connected with the neutral plate of the capacitor busbar, and the second ends of the tube 1 and the tube 2 are connected with the first end of the tube 5; the first end of the tube 3 is connected with a negative plate of the capacitor busbar, the first end of the tube 4 is connected with a neutral plate of the capacitor busbar, and the tube 3 is connected with the second end of the tube 4 and then connected with the first end of the tube 6; the second ends of the tubes 5 and 6 are in turn connected to the output row. The capacitor cells connected to the capacitor busbar are further divided into two parts, namely corresponding to C1 and C2 in fig. 2, respectively.

Referring to fig. 3, in the conventional power module, the IGBT device is generally selected in such a structure that terminals of the IGBT device are located at upper and lower ends of the IGBT device, respectively, so that connection and installation of the input and output rows can be facilitated. In some cases, however, an IGBT device as shown in fig. 6 needs to be selected, where terminals of the device are located on top of the device body and are directly connected to semiconductor portions in the IGBT device, which results in that when the input and output rows are mounted, stress of the copper row is directly conducted to the semiconductor portions in the IGBT device, resulting in reduced reliability of the IGBT device and easy failure.

Disclosure of Invention

The present invention has been made to overcome the above-mentioned drawbacks or problems occurring in the prior art, and an object of the present invention is to provide a power module and a current transformer, which can alleviate the transmission of stress of a connection member to a connection terminal on a switching device to a semiconductor portion in the switching device.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the technical scheme is as follows: a power assembly, comprising: the radiator is provided with a mounting surface, and a plurality of fixing parts are convexly arranged on the mounting surface; the wiring part comprises wiring rows, and the wiring rows are locked and fixed on the radiator through fixing parts; and a plurality of switching devices fixed to the mounting surface; the switch device comprises a switch body and a plurality of wiring terminals exposed out of the switch body; the switch body is provided with a semiconductor part and an elastic conductive piece; the elastic conductive piece is electrically connected with the semiconductor part and the wiring terminal, a first direction and a second direction which are perpendicular to each other are defined according to the elastic deformation direction of the elastic conductive piece, and the elastic conductive piece is suitable for buffering wiring stress from the wiring terminal to the semiconductor part in the first direction and the second direction; the wiring terminals on the switching device are sequentially arranged along the second direction; the first direction is perpendicular to the mounting surface; the wiring row is electrically connected with a wiring terminal on the switching device, and is far away from the mounting surface relative to the switch body of the switching device; the first direction or the second direction is a vertical direction.

Technical scheme II based on technical scheme I: the capacitor busbar is also included; in the switching device, a part connected with the capacitor busbar through the wiring component is a direct-current side switching device, and a part connected with the alternating-current side of the power component is an alternating-current side switching device; the part of the wiring row, which is connected with the direct-current side switching device and the capacitor busbar, is a direct-current wiring row, and the direct-current wiring row is connected with a corresponding wiring terminal on the direct-current side switching device; the mounting surface of the radiator is vertical to the capacitor busbar; and the wiring parts of the direct current wiring row and the capacitor busbar are positioned on one side of the second direction on the plane where the mounting surface of the radiator is positioned, and the extending direction of the part of the direct current wiring row corresponding to the position of the direct current side switching device is perpendicular to the first direction and the second direction.

Technical scheme III based on technical scheme I: the capacitor busbar is also included; in the switching device, a part connected with the capacitor busbar through the wiring component is a direct-current side switching device, and a part connected with the alternating-current side of the power component is an alternating-current side switching device; the part of the wiring row, which is connected with the direct-current side switching device and the capacitor busbar, is a direct-current wiring row, and the direct-current wiring row is connected with a corresponding wiring terminal on the direct-current side switching device; the mounting surface of the radiator is parallel to the capacitor busbar; and the wiring parts of the direct current wiring row and the capacitor busbar are positioned at one end of the second direction on the plane where the mounting surface of the radiator is positioned, and the extending direction of the part of the direct current wiring row corresponding to the position of the direct current side switching device is parallel to the second direction.

Technical scheme IV based on technical scheme II or three: the direct-current side switching device and the alternating-current side switching device are matched to form a switching module, and a plurality of switching modules are matched to form a single-phase switching tube group; in each single-phase switching tube group, the direct-current side switching devices and the alternating-current side switching devices are sequentially arranged along a third direction, and the third direction is perpendicular to the first direction and the second direction.

Technical scheme five based on technical scheme four: in each single-phase switch tube group, each direct-current side switch device and each alternating-current side switch device are positioned on the same mounting surface, and each direct-current side switch device is positioned above each alternating-current side switch device; the fixing part of the radiator is positioned above the direct-current side switching device, is positioned between the direct-current side switching device and the alternating-current side switching device, and is positioned between the adjacent alternating-current side switching devices; the second direction is parallel to the up-down direction of the power assembly.

Technical scheme six based on technical scheme four: each of the switching modules is divided into a portion including only a dc-side switching device and a portion including both the dc-side switching device and the ac-side switching device; the radiator comprises two opposite mounting surfaces, and any one of the two mounting surfaces only comprises one part of the switch module; the fixing part of the radiator is partially positioned above the direct-current side switching device and partially positioned between the direct-current side switching device and the alternating-current side switching device; the second direction is parallel to the up-down direction of the power assembly.

Technical scheme seven based on technical scheme five or six: each switch module comprises two direct-current side switch devices and one alternating-current side switch device; when the switch modules are respectively positioned on the two mounting surfaces, the direct-current side switch devices and the alternating-current side switch devices positioned on the same mounting surface correspond to each other in the second direction, and the direct-current side switch devices positioned on different mounting surfaces correspond to each other in the first direction; the direct-current side switching devices and the alternating-current side switching devices which are positioned on different mounting surfaces are connected through a connecting row in the wiring part, and the connecting row penetrates through the radiator.

Technical scheme eight based on technical scheme seven: in the wiring component, the direct current wiring row comprises a plurality of polar plates which are arranged in a laminated mode.

Technical scheme nine based on technical scheme eight: in the direct current wiring row, polar plates far away from wiring terminals of the switching device are connected with the corresponding wiring terminals through electric connecting pieces.

Technical scheme ten: a current transformer comprising a main body and the power assembly of any one of claims one to nine, the power assembly being fixedly mounted within the main body; wherein, when the mounting surface is a horizontal surface, the second direction is a vertical direction; when the mounting surface is a vertical plane, the first direction is a vertical direction.

As can be seen from the above description of the present invention, the present invention has the following advantages over the prior art:

1. in the power component provided by the invention, the radiator is provided with the convex fixing parts, the wiring bars in the wiring parts are locked and fixed on the radiator through the fixing parts, and the positions of the wiring bars are fixed and are not easy to shake when the power component is transported or used, so that the influence of the wiring bars on a switch device is avoided; in the power assembly, the adopted switching device is provided with a switching body and a wiring terminal exposed out of the switching body, the wiring bar is connected with the wiring terminal, a semiconductor part and an elastic conductive piece are arranged in the switching body, the semiconductor part is used for realizing the basic function of the switching device, and the elastic conductive piece is connected with the wiring terminal and the semiconductor part to play a role of stress buffering, so that the semiconductor part is prevented from being influenced when the wiring terminal is stressed; the elastic conductive piece is influenced by the elastic deformation direction of the elastic conductive piece, and can provide stress buffering in the first direction and the second direction; further, one of the first direction and the second direction is the vertical direction, so that when the switching device on the power assembly is in a standing or lying state, even if the connection between the wiring row and the fixing part is fallen off or fails, the stress buffering effect of the elastic conductive piece in the first direction and the second direction can be reduced, the influence of the semiconductor part on the wiring operation or the influence of gravity on the application of force to the wiring terminal of the wiring row is reduced, the use safety of the semiconductor part is ensured, and the service life of the switching device is prolonged.

2. The power assembly comprises a capacitor busbar, wherein the capacitor busbar and the direct current wiring bar are fixedly connected at a wiring part, and the capacitor busbar can play a certain role in positioning the wiring bar; when the mounting surface of the radiator is perpendicular to the capacitor busbar, the extending direction of the direct current wiring row is perpendicular to the first direction and the second direction, and if the switching device is in the vertical posture at this time, the tail end of the direct current wiring row can easily droop, but the mounting posture of the switching device is limited, so that even if the tail end of the direct current wiring row sags, the sagging direction is the second direction, and the elastic conductive piece can buffer the stress in the direction.

3. When the mounting surface of the radiator is parallel to the capacitor busbar, the extending direction of the direct current wiring row is parallel to the second direction, if the switching device is in an upright position at the moment, the direct current wiring row is easy to move downwards under the influence of gravity, but the moving direction of the direct current wiring row is the second direction at the moment, and the elastic conductive piece can still buffer the stress in the direction; no matter the mounting surface of the radiator is vertical or parallel to the capacitor busbar, when the switching device is in a lying position, the direct current wiring row tends to move downwards along the first direction, but the tendency is buffered and counteracted by the elastic deformation of the elastic conductive piece in the first direction, and the semiconductor part is not affected.

4. The direct current side switching devices and the alternating current side switching devices are sequentially distributed along a third direction, which is equivalent to the arrangement perpendicular to a second direction, and the switching devices are parallel in the width direction, so that the layout of the switching devices on the radiator is more compact, and the size of the power assembly can be reduced.

5. The direct-current side switch device and the alternating-current side switch device in the single-phase switch tube group are positioned on the same mounting surface, so that the air-cooled radiator is convenient to use, but the liquid-cooled radiator can also adopt the layout, and the heat dissipation efficiency of the liquid-cooled radiator can be improved; when the switch devices are positioned on the same installation surface, the direct current side switch devices are arranged above the alternating current side switch devices, the direct current side switch devices and the alternating current side switch devices are arranged separately to facilitate the arrangement and connection of the wiring components, and meanwhile, the fixing parts are arranged at a plurality of positions, so that the stability of the wiring row installed to the radiator can be improved.

6. The switch module is divided into two parts, the two parts are respectively positioned on the two mounting surfaces of the radiator, so that the space utilization efficiency of the radiator can be improved, and meanwhile, the fixing parts are arranged at a plurality of positions, so that the stability of the wiring row mounted to the radiator is improved.

7. When the switch module comprises two separated parts, the two direct current side switch devices can be correspondingly arranged on two mounting surfaces, one alternating current side switch device is arranged below one mounting surface, and the direct current side switch devices and the alternating current side switch devices on different mounting surfaces are connected through the radiator by connecting rows in the wiring component, so that the space utilization efficiency of the radiator is improved, a converter loop can be shortened, and stray inductance in a circuit is reduced.

8. The polar plates in the direct current wiring row are arranged in a laminated manner, so that the connection of the wiring row and a switching device can be facilitated, and stray inductance of a circuit at a position far away from the capacitor busbar can be reduced through lamination.

9. When a distance exists between the wiring terminal of the switching device and the corresponding polar plate, the electric connecting piece is arranged to connect the wiring terminal with the corresponding polar plate, and the influence of the distance on wiring is wiped off.

10. The invention provides a current transformer, wherein a power component is fixedly arranged in a main body of the current transformer, and a second direction or a first direction of a switching device can be respectively configured to be a vertical direction no matter a mounting surface is a horizontal plane or a vertical plane, namely the switching device in the power component is in a lying posture or an upright posture, and under the two postures, an elastic conductive piece in the switching device can buffer the applied force from a wiring row to a terminal of the switching device, so that the influence on a semiconductor part in the switching device is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments below are briefly introduced, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art power assembly;

FIG. 2 is a circuit diagram of a prior art three-level topology;

fig. 3 is a schematic structural diagram of an IGBT device in a power module according to the related art;

fig. 4 is a schematic structural diagram 1 of a power component according to embodiment 1 of the present invention;

fig. 5 is a schematic structural diagram 2 of a power component according to embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of a switching device in the power module according to embodiment 1 of the present invention;

fig. 7 is a schematic diagram of an internal structure of the switching device of fig. 6;

FIG. 8 is a schematic diagram of the elastic conductive element in the switching device of FIG. 7;

fig. 9 is a schematic structural diagram 1 of a power component according to embodiment 2 of the present invention;

fig. 10 is a schematic structural diagram 2 of a power component according to embodiment 2 of the present invention;

fig. 11 is a schematic structural diagram of a power module according to embodiment 2 of the present invention.

The main reference numerals illustrate:

a capacitor module 10; a DC capacitor pool 11; a capacitor busbar 12;

a power module 20; a unidirectional switch tube group 21; a wiring member 22; a dc wiring row 221; a connection row 222; an ac line bank 223; a heat sink 23; a fixing portion 231; a through hole 232; a mounting surface 233; a switching device 24; a switch body 241; a connection terminal 242; a dc side switching device 243; an ac side switching device 244; a semiconductor portion 245; elastic conductive element 246.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without creative efforts, are within the protection scope of the present invention.

In the claims, specification and drawings hereof, unless explicitly defined otherwise, the terms "first," "second," or "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.

In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, references to orientation or positional relationship such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are based on the orientation and positional relationship shown in the drawings and are merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a particular orientation or be constructed and operated in a particular orientation, nor should it be construed as limiting the particular scope of the invention.

In the claims, specification and drawings of the present invention, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.

In the claims, specification and drawings of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.

Example 1

Referring to fig. 4 and 5, embodiment 1 of the present invention provides a power assembly mainly including a capacitor module and a power module, wherein the capacitor module includes a dc capacitor cell 11 and a capacitor busbar 12, and the power module includes a heat sink 23, a wiring member 22 and a plurality of switching devices 24.

Referring to fig. 4, there is shown the corresponding orientation in the power assembly, wherein in the present specification and claims, a first direction, a second direction and a third direction are also referred to, and in the present embodiment, the first direction is a front-rear direction, the second direction is an up-down direction, and the third direction is a left-right direction.

Referring to fig. 4, in the capacitor module, the main body is an upright capacitor busbar 12, and a plurality of capacitors are fixedly connected to the left side surface of the capacitor busbar 12, and form a dc capacitor pool 11; the lower end of the capacitor busbar 12 forms a terminal connected with the direct current side of the power component, a wiring component 22 in the power module is connected with the capacitor busbar 12, and then the power module is connected with the alternating current side of the power component, so that a complete loop of the power component is realized.

The capacitance in the capacitance module corresponds to the capacitance C1 and the capacitance C2 in fig. 2. Meanwhile, the capacitor busbar 12 includes three electrode plates which are arranged in a stacked manner, are arranged in order from left to right, and are a positive electrode plate, a neutral electrode plate, and a negative electrode plate, respectively.

In the power module, the heat sink 23 has a mounting surface 233, and a plurality of fixing portions 231 are protruded from the mounting surface 233. Referring to fig. 4 and 5, in the present embodiment, the radiator 23 is an air-cooled radiator 23, the front surface of which forms a mounting surface 233, and the rear of which is provided with heat radiation fins. On the front mounting surface 233 of the radiator 23, a plurality of protruding fixing portions 231 are distributed, and the ends of the fixing portions 231 form forward bearing surfaces.

Referring to fig. 4 and 5, the wiring member 22 includes a wiring row therein, which is locked and fixed to the heat sink 23 by the fixing portions 231. The wiring lines include a dc wiring line 221, a connection line 222, and an ac wiring line 223, where the dc wiring line 221 connects the capacitor busbar 12 and the switching device 24, the connection line 222 is used to form an electrical connection between the switching devices 24, and the ac wiring line 223 connects the switching device 24 and the ac side of the power component.

Referring to fig. 4, the plurality of switching devices 24 are each fixed to the mounting surface 233 of the heat sink 23. Referring to fig. 6, the switching device 24 includes a switch body 241 and a plurality of connection terminals 242 exposed from the switch body 241, in which the number of connection terminals 242 is three in the present embodiment, and the three connection terminals 242 are sequentially arranged along the second direction. Referring to fig. 7, the switch body 241 is provided with a semiconductor portion 245 and an elastic conductive member 246, the semiconductor portion 245 is a semiconductor wafer of the switching device, and is easily damaged when a certain stress is applied thereto, and the elastic conductive member 246 connects the semiconductor portion 245 and the connection terminal 242. Referring to fig. 7 and 8, the elastic conductive member 246 has a wave shape in a cross section in the front-rear direction, so that the elastic conductive member 246 may provide elastic deformation in the first direction and the second direction, and the elastic conductive member 246 may not provide elastic deformation in the third direction, i.e., the left-right direction; thereby, the elastic conductive member 246 is adapted to buffer the wiring stress of the wiring terminal 242 to the semiconductor portion 245 in the first direction and the second direction. In short, taking the direction shown in fig. 6 as an example, the terminal 242 may be slightly pulled or pressed in the front-back direction, or the terminal 242 may be slightly pulled in the up-down direction, in which case the elastic conductive member 246 may utilize its own elastic deformation to slow or eliminate the influence of the position variation of the terminal 242 on the semiconductor portion 245, while not affecting the electrical connection between the terminal 242 and the semiconductor portion 245.

The terminal block is electrically connected to the terminal 242 on the switching device 24 and is remote from the mounting surface 233 with respect to the switch body 241 of the switching device 24. That is, the terminal block covers the switching device 24 so as to form a connection with the terminal 242.

Referring to fig. 4 and 5, in the switching device 24, a portion connected to the capacitor busbar 12 through the wiring member 22 is a dc side switching device 243, and a portion connected to the ac side of the power module is an ac side switching device 244; among the wiring lines, the portion connecting the dc side switching device 243 and the capacitor busbar 12 is a dc wiring line 221, and the dc wiring line 221 is connected to a corresponding wiring terminal 242 on the dc side switching device 243. In the present embodiment, the mounting surface 233 of the heat sink 23 is perpendicular to the capacitor busbar 12, the connection parts of the dc wiring line 221 and the capacitor busbar are located on one side of the second direction on the plane where the mounting surface 233 of the heat sink 23 is located, and the extending direction of the portion of the dc wiring line 221 corresponding to the location of the dc side switching device 243 is perpendicular to the first direction and the second direction.

The dc side switching device 243 and the ac side switching device 244 cooperate to form a switching module, and a plurality of switching modules cooperate to form a single-phase switching tube group; in each single-phase switching tube group, the dc-side switching device 243 and the ac-side switching device 244 are arranged in order along the third direction.

Specifically, in this embodiment, each of the switch modules includes two dc-side switch devices 243 and one ac-side switch device 244, and the four switch modules cooperate to form a single-phase switch tube group, and the three single-phase switch tube groups respectively correspond to three phases of the ac side. Three heat sinks 23 are simultaneously provided, each heat sink 23 being provided with all switching devices 24 in one single-phase switching tube group, respectively. In one single-phase switching tube group, the dc side switching device 243 is located on the upper side of the mounting surface 233, the ac side switching device 244 is located on the lower side of the mounting surface 233, and a certain space is provided between the dc side switching device 243 and the ac side switching device 244, and a certain space is provided between the ac side switching devices 244 in the left-right direction. The fixing portion 231 on the heat sink 23 is divided into three portions, one portion is disposed above the dc side switching device 243, one portion is disposed between the dc side switching device 243 and the ac side switching device 244, and one portion is disposed between the ac side switching devices 244.

The wiring member 22 includes a direct current wiring row 221, a connection row 222, and an alternating current wiring row 223. The dc link 221 corresponds to three plates of the capacitor busbar 12 and also has three plates which are stacked and connected to corresponding terminals 242 of the dc side switching device 243. Specifically, in one switch module, six connection terminals 242 are shared by two dc side switching devices 243, wherein two connection terminals 242 of one dc side switching device 243 located at an upper position are respectively connected to the positive electrode plate and the neutral electrode plate in the dc line bank 221, and two connection terminals 242 of the other dc side switching device 243 located at an upper position are respectively connected to the negative electrode plate and the neutral electrode plate in the dc line bank 221. The lowermost connection terminal 242 of the two dc side switching devices 243 is connected to the connection row 222, and the connection row 222 is connected to the two connection terminals 242 located at the upper positions of the corresponding ac side switching devices 244. The ac line bank 223 is connected to a connection terminal 242 located at a lower position on the ac side switching device 244. Referring to fig. 5, the connection line 222 is stacked on the dc line 221 and on the ac line 223.

The dc wiring line 221 is locked and fixed to the fixing portion 231 at the upper position and the middle position, and the connection line 222 is locked and fixed to the fixing portion 231 at the middle position and the lower position. In this embodiment, the left end of the dc link line 221 is connected and fixed to the capacitor busbar 12, and then the dc link line 221 extends rightward to the rightmost dc side switching device 243.

When the power module is assembled, the switching device 24 is firstly mounted and fixed on the mounting surface 233 of the radiator 23 in an upright posture, then the wiring member 22 is abutted against the supporting surface of the corresponding fixing portion 231 and is locked and fixed by a fastener, and finally the wiring member 22 is connected with the corresponding wiring terminal 242 on the switching device 24. By this mounting sequence, excessive stress on the connection terminal 242 on the switching device 24 at the time of the locking and fixing of the connection member 22 can be avoided. Also in the present embodiment, the switching device 24 is fixed to the heat sink 23 in an upright posture, so that even if the connection between the wiring member 22 and the fixing portion 231 is loosened, the downward movement of the wiring member 22 is counteracted by the elastic deformation of the elastic conductive member 246 in the vertical direction, avoiding the influence on the semiconductor portion 245.

Example 2

Example 2 is based on example 1, and the differences between them are described below.

In embodiment 2, referring to fig. 11, the mounting surface 233 of the heat sink 23 is parallel to the capacitor busbar 12, the connection parts of the dc wiring line 221 and the capacitor busbar 12 are located at one end in the second direction on the plane where the mounting surface 233 of the heat sink 23 is located, and the extending direction of the part of the dc wiring line 221 corresponding to the position where the dc side switching device 243 is located is parallel to the second direction.

Referring to fig. 9 and 10, each of the switching modules is divided into a portion including only the dc side switching device 243 and a portion including both the dc side switching device 243 and the ac side switching device 244; the heat sink 23 includes two facing away mounting surfaces 233, any of which mounting surfaces 233 includes only a portion of the switch module; in the fixing portion 231 of the heat sink 23, a part is located above the dc side switching device 243, and a part is located between the dc side switching device 243 and the ac side switching device 244. When the switch modules are respectively located on the two mounting surfaces 233, the dc-side switch device 243 and the ac-side switch device 244 located on the same mounting surface 233 correspond in the second direction, and the dc-side switch device 243 located on different mounting surfaces 233 correspond in the first direction; the dc side switching device 243 and the ac side switching device 244 on the different mounting surfaces 233 are connected by the connection row 222 in the wiring member 22, and the connection row 222 penetrates the heat sink 23.

Referring to fig. 9, in the present embodiment, the switching device 24 is also mounted on the radiator 23 in an upright posture, and at this time, the first direction is the front-rear direction, the second direction is the up-down direction, and the third direction is the left-right direction.

The number of the heat sinks 23 is one, three single-phase switching tube groups are all arranged on one heat sink 23, each single-phase switching tube group comprises four switching modules, in each switching module, one direct-current side switching device 243 is located on the front side mounting surface 233, one direct-current side switching device 243 is located on the rear side mounting surface 233, and the alternating-current side switching device 244 is located on the front side mounting surface 233 and below the corresponding direct-current side switching device 243. In the intermediate position of the heat sink 23, that is, in a position between the dc side switching device 243 and the ac side switching device 244, a through hole 232 is provided, and referring to fig. 10, the connection row 222 passes through the through hole 232 to connect the dc side switching device 243 on the rear side mounting surface 233 and the ac side switching device 244 on the front side mounting surface 233.

Referring to fig. 10 and 11, in the present embodiment, the wiring member 22 further includes a wiring terminal. A dc-side switching device 243 on the front-side mounting surface 233, connected to the capacitor busbar 12 through a dc wiring line 221 provided in a stacked manner, where the dc wiring line 221 corresponds to the positive plate and the neutral plate; the dc side switching device 243 on the rear side mounting surface 233 is directly connected to the capacitor busbar 12 through a terminal, which is divided into two types corresponding to the negative plate and the neutral plate.

Furthermore, in the present embodiment, an electrical connector is also provided. When the two pole plates of the dc link line 221 are connected to the dc side switching device 243 on the front side mounting surface 233, the pole plate of the terminal 242 farther from the switching device 24 is connected to the corresponding terminal 242 by an electrical connection. Since the heights of the connection terminals 242 extending out of the switch body 241 are the same, when the electrode plate nearer to the switch device 24 is connected with the corresponding connection terminal 242, a gap exists between the electrode plate farther from the switch device 24 and the corresponding connection terminal 242, and at this time, the electrode plate in the dc link 221 can be connected with the corresponding connection terminal 242 by trowelling the gap through the electrical connector.

Example 3

An embodiment 3 of the present invention provides a current transformer, which includes a main body and the power component in embodiment 1 or embodiment 2, where the power component is fixedly installed in the main body, and the first direction is a vertical direction or the second direction is a vertical direction.

Specifically, in the current transformer, the power module may be mounted in two postures, one posture is that the first direction is a vertical direction, that is, the radiator 23 is mounted in a lying posture, at this time, the switching device 24 on the radiator 23 is also in a lying posture, and the wiring member 22 is located above the switching device 24, so that the protruding portion may support the wiring member 22; the other posture is a vertical direction in which the radiator 23 is installed in an upright posture, and at this time, the switching device 24 on the radiator 23 is also in an upright posture, the wiring member 22 is located on the side of the switching device 24, and the direction of the gravitational force received by the wiring member 22 coincides with the second direction, and even if there is a tendency of the wiring member 22 to move downward, the switching device 24 can buffer the stress received by the wiring terminal 242 by the elastic conductive member 246 inside.

The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.

Claims (10)

1. A power assembly, comprising:

a radiator (23) having a mounting surface (233), and a plurality of fixing portions (231) protruding from the mounting surface (233);

a wiring member (22) including a wiring row which is locked and fixed to the heat sink (23) by respective fixing portions (231); and

a plurality of switching devices (24) fixed to the mounting surface (233); the switching device (24) comprises a switch body (241) and a plurality of wiring terminals (242) exposed out of the switch body (241); the switch body (241) is provided with a semiconductor part (245) and an elastic conductive member (246); the elastic conductive element (246) is electrically connected with the semiconductor part (245) and the wiring terminal (242), and defines a first direction and a second direction which are perpendicular to each other according to the elastic deformation direction of the elastic conductive element, and the elastic conductive element (246) is suitable for buffering the wiring stress from the wiring terminal (242) to the semiconductor part (245) in the first direction and the second direction; a plurality of connection terminals (242) on the switching device (24) are sequentially arranged along a second direction; the first direction is perpendicular to the mounting surface (233);

the wiring row is electrically connected with a wiring terminal (242) on the switching device (24), and is far away from the mounting surface (233) relative to a switch body (241) of the switching device (24); the first direction or the second direction is a vertical direction.

2. A power assembly according to claim 1, further comprising a capacitor busbar (12);

in the switching device (24), a part connected with the capacitor busbar (12) through the wiring component (22) is a direct-current side switching device (243), and a part connected with the alternating-current side of the power assembly is an alternating-current side switching device (244);

the part of the wiring row, which connects the direct-current side switching device (243) and the capacitor busbar (12), is a direct-current wiring row (221), and the direct-current wiring row (221) is connected with a corresponding wiring terminal (242) on the direct-current side switching device (243);

the mounting surface (233) of the radiator (23) is perpendicular to the capacitor busbar (12); the wiring parts of the direct current wiring row (221) and the capacitor busbar (12) are positioned on one side of the second direction on the plane where the mounting surface (233) of the radiator (23) is positioned, and the extending direction of the part of the direct current wiring row (221) corresponding to the position where the direct current side switching device (243) is positioned is perpendicular to the first direction and the second direction.

3. A power assembly according to claim 1, further comprising a capacitor busbar (12);

in the switching device (24), a part connected with the capacitor busbar (12) through the wiring component (22) is a direct-current side switching device (243), and a part connected with the alternating-current side of the power assembly is an alternating-current side switching device (244);

the part of the wiring row, which connects the direct-current side switching device (243) and the capacitor busbar (12), is a direct-current wiring row (221), and the direct-current wiring row (221) is connected with a corresponding wiring terminal (242) on the direct-current side switching device (243);

the mounting surface (233) of the radiator (23) is parallel to the capacitor busbar (12); the connection part of the direct current connection row (221) and the capacitor busbar (12) is positioned at one end of the second direction on the plane where the installation surface (233) of the radiator (23) is positioned, and the extending direction of the part of the direct current connection row (221) corresponding to the position of the direct current side switch device (243) is parallel to the second direction.

4. A power assembly according to claim 2 or 3, characterized in that the dc side switching device (243) cooperates with the ac side switching device (244) to form a switching module, a plurality of switching modules cooperating to form a single-phase switching tube set; in each single-phase switching tube group, the direct-current side switching device (243) and the alternating-current side switching device (244) are sequentially arranged along a third direction, which is perpendicular to the first direction and the second direction.

5. A power assembly according to claim 4, wherein in each single-phase switching tube group, each of the dc-side switching devices (243) and the ac-side switching devices (244) are located on the same mounting surface (233), and each of the dc-side switching devices (243) is located above the ac-side switching device (244); in the fixing part (231) of the radiator (23), part of the fixing part is positioned above the direct current side switching device (243), part of the fixing part is positioned between the direct current side switching device (243) and the alternating current side switching device (244), and part of the fixing part is positioned between the adjacent alternating current side switching devices (244); the second direction is parallel to the up-down direction of the power assembly.

6. A power assembly as claimed in claim 4, wherein each of said switching modules is divided into a portion comprising only a dc side switching device (243) and a portion comprising both a dc side switching device (243) and an ac side switching device (244); the heat sink (23) comprises two facing away mounting surfaces (233), any one of which mounting surfaces (233) comprises only a part of the switch module; in the fixing part (231) of the radiator (23), part of the fixing part is positioned above the direct-current side switching device (243), and part of the fixing part is positioned between the direct-current side switching device (243) and the alternating-current side switching device (244); the second direction is parallel to the up-down direction of the power assembly.

7. A power assembly according to claim 5 or 6, characterized in that each of said switching modules comprises two dc side switching devices (243) and one ac side switching device (244); when the switch modules are respectively positioned on the two mounting surfaces (233), the direct-current side switch device (243) and the alternating-current side switch device (244) positioned on the same mounting surface (233) correspond to each other in the second direction, and the direct-current side switch devices (243) positioned on different mounting surfaces (233) correspond to each other in the first direction; the direct-current side switching device (243) and the alternating-current side switching device (244) which are positioned on different mounting surfaces (233) are connected through a connection row (222) in the wiring part (22), and the connection row (222) penetrates through the radiator (23).

8. A power assembly according to claim 7, characterized in that the direct current connection block (221) comprises a plurality of stacked plates in the connection block (22).

9. A power assembly according to claim 8, characterized in that the plates of the direct current connection block (221) further from the connection terminals (242) of the switching device (24) are connected to the corresponding connection terminals (242) by means of electrical connections.

10. A current transformer comprising a body and a power assembly according to any one of claims 1-9, the power assembly being fixedly mounted within the body; wherein, when the mounting surface is a horizontal surface, the second direction is a vertical direction; when the mounting surface is a vertical plane, the first direction is a vertical direction.