Power module and frequency converter

Abstract

According to the scheme, the power module comprises a frame assembly and a power string assembly, the power string assembly comprises a power string, a crimping mechanism and a bus mechanism, the crimping mechanism crimps the centers of the two ends of the power string between two opposite side plates in the frame assembly under the action of elastic force, and the bus mechanism is electrically connected with the power string. In the power module, the centers of the two ends of the power string are crimped between the two opposite side plates in the frame assembly by the crimping mechanism under the action of the elastic force, so that the use of mounting parts of the power string can be reduced, the occupied space for arranging the mounting parts can be reduced, and the compactness of the power module can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of frequency converters, and in particular to a power module and a frequency converter. Background Art

[0002] Power modules are primarily used in frequency converters and primarily consist of integrated gate-commutated thyristors (IGCTs) and diode modules. However, due to their limited compactness, increasing the power rating of power modules within the limited size of frequency converters is challenging.

[0003] Therefore, how to improve the compactness of the power module has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] The present application proposes a power module and a frequency converter to improve the compactness of the power module.

[0005] In order to achieve the above objectives, this application discloses the following technical solutions:

[0006] In the first aspect, the present application provides a power module, including a frame assembly and a power string assembly. The power string assembly includes a power string, a crimping mechanism and a busbar mechanism. The crimping mechanism crimps the centers of the two ends of the power string between two opposite side plates inside the frame assembly under the action of elastic force, and the busbar mechanism is electrically connected to the power string.

[0007] In some embodiments, the frame assembly includes a frame plate, a base plate, an insulating beam, a mounting plate and a fixed plate, wherein the frame plate has two opposite side plates; along the height direction, the base plate is installed at the bottom of the frame plate, and the insulating beam is installed at the top of the frame plate; the fixed plate and the mounting plate are arranged on the frame plate, and the fixed plate is used to install the semiconductor switching tube of the power string.

[0008] In some embodiments, the frame plate includes a first side plate, a second side plate, a third side plate and a pull rod, wherein the first side plate, the second side plate and the third side plate are connected in sequence; the first side plate and the third side plate are metal plates arranged opposite to each other, and the second side plate is an insulating plate; the pull rod connects the first side plate and the third side plate.

[0009] In some embodiments, a capacitor and a resistor are provided outside the second side plate, one end of the capacitor is connected to the resistor, and the other end of the capacitor is electrically connected to the O phase of the power string.

[0010] In some embodiments, the fixing plate and the mounting plate are both arranged opposite to the second side plate and are both fixed to the first side plate and the third side plate. Positioning pins are also provided on the outside of the second side plate to cooperate with the positioning holes of the cabinet for positioning.

[0011] In some embodiments, the power string includes a first insulating crimping block, a first semiconductor switch tube, a first heat sink, a first diode module, a second heat sink, a second diode module, a third heat sink, a second semiconductor switch tube and a second insulating crimping block stacked together along a stacking direction, and the first semiconductor switch tube and the second semiconductor switch tube are connected to a fixed plate.

[0012] In some embodiments, the busbar mechanism includes a first busbar and a second busbar, the first busbar is crimped between the first insulating crimping block and the first semiconductor switch tube, the second busbar is crimped between the second semiconductor switch tube and the second insulating crimping block, and the first busbar and the second busbar are connected to form an O phase.

[0013] In some embodiments, the first radiator, the second radiator, and the third radiator are air-cooled radiators, the second radiator leads to a third busbar, and the third busbar is connected to the first busbar and the second busbar to form an O phase;

[0014] The first radiator, the second radiator and the third radiator are connected to the first external busbar, the second external busbar and the third external busbar in sequence, and the first external busbar, the second external busbar and the third external busbar are all fixed on the insulating beam.

[0015] In some embodiments, along the height direction, the first insulating crimping block, the first heat sink, the second heat sink, the third heat sink, and the second insulating crimping block are all hung on the insulating beam through hanging members.

[0016] In some embodiments, the hanging member includes a first mounting member, an elastic member and a second mounting member, wherein the first mounting member is arranged on the insulating beam, the second mounting member is arranged on the component to be hung, one end of the elastic member is connected to the first mounting member, and the other end of the elastic member is connected to the second mounting member, and the component to be hung is a first insulating crimping block, a first heat sink, a second heat sink, a third heat sink or a second insulating crimping block.

[0017] In some embodiments, the crimping mechanism includes a guide post, a disc spring, a crimping head, a conical block and a fixing pin, wherein the guide post is sleeved on one of the two side plates, the disc spring is sleeved on the outer periphery of the guide post, the crimping head slides with the guide post, and the crimping head abuts against one end of the power string, and the fixing pin is arranged on the other side plate and supports the other end of the power string.

[0018] In some embodiments, one end of the guide post is exposed from the corresponding side panel, and the guide post is threadedly engaged with the side panel.

[0019] In some embodiments, the power module is a crowbar power module.

[0020] In a second aspect, the present application provides an inverter, comprising a cabinet and a power module as described above, wherein the power module is installed in the cabinet.

[0021] It can be seen from the above technical solution that in the above-mentioned power module of the present application, since the crimping mechanism crimps the centers of the two ends of the power string between the two opposite side plates in the frame assembly under the action of elastic force, the use of installation components of the power string can be reduced, and at the same time, the space occupied by arranging the installation components can be reduced, thereby improving the compactness of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or prior art descriptions. Obviously, the drawings described below are only some examples or embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on the provided drawings, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language context or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0023] Figure 1 A front view of a power module provided in an embodiment of the present application;

[0024] Figure 2 A bottom view of a power module provided in an embodiment of the present application;

[0025] Figure 3 A front perspective view of a power module provided in an embodiment of the present application;

[0026] Figure 4 A rear perspective view of a power module provided in an embodiment of the present application;

[0027] In the figure: 100-frame assembly; 200-power string assembly; 300-capacitor; 400-resistor;

[0028] 110-frame plate; 120-bottom plate, 130-insulating beam; 140-mounting plate; 150-fixing plate;

[0029] 111-first side plate; 112-second side plate; 113-third side plate; 114-pull rod; 1121-locating pin;

[0030] 131-busbar pad;

[0031] 141 - first longitudinal mounting plate; 142 - second longitudinal mounting plate; 143 - first transverse mounting plate; 144 - second transverse mounting plate; 145 - mounting hole;

[0032] 151 - first longitudinal fixing plate; 152 - second longitudinal fixing plate; 153 - first transverse fixing plate; 154 - second transverse fixing plate; 155 - reinforcement plate; 156 - angle plate;

[0033] 210-power string; 220-crimping mechanism; 230-busbar mechanism;

[0034] 211a-first insulating crimping block; 211b-second insulating crimping block;

[0035] 212a-first semiconductor switch tube; 212b-second semiconductor switch tube;

[0036] 213a-first radiator; 213b-second radiator; 213c-third radiator;

[0037] 213a1-first external busbar; 213b1-second external busbar; 213c1-third external busbar;

[0038] 214a-first diode module; 214b-second diode module;

[0039] 221-guide column; 222-disc spring; 223-pressing joint; 224-conical block; 225-fixing pin; 2211-polygonal hole;

[0040] 231-first busbar; 232-second busbar; 233-third busbar;

[0041] 310-fourth busbar; 320-fifth busbar; 330-capacitor support foot;

[0042] 410-Resistor support foot. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are merely for explaining the related application and are not intended to limit the application. The described embodiments are merely a portion of the embodiments of the present application and are not intended to be exhaustive. All other embodiments derived by persons of ordinary skill in the art based on the embodiments in the present application without creative effort are intended to fall within the scope of protection of the present application.

[0044] In order to achieve the purpose of improving the compactness of the power module, this application specifically introduces the structure of the power module with reference to the accompanying drawings:

[0045] See also Figures 1 to 4 In order to achieve the above objectives, this application discloses the following technical solutions:

[0046] A power module is disclosed in an example of the present application, including a frame assembly 100 and a power string assembly 200. The power string assembly 200 includes a power string 210, a crimping mechanism 220 and a busbar mechanism 230. The crimping mechanism 220 crimps the centers of the two ends of the power string 210 between two opposite side plates inside the frame assembly 100 under the action of elastic force, and the busbar mechanism 230 is electrically connected to the power string 210.

[0047] In the above-mentioned power module of the present application, since the crimping mechanism 220 crimps the centers of the two ends of the power string 210 between the two opposite side plates in the frame assembly 100 under the action of elastic force, the use of installation components of the power string 210 can be reduced, and the space occupied by arranging the installation components can also be reduced, thereby improving the compactness of the power module, reducing material costs, and improving the manufacturability and maintainability of the product.

[0048] To facilitate understanding of the technical solution of the present application, the following definitions are made: the power module has a length direction, a width direction, and a height direction, wherein the length direction corresponds to the X direction in the rectangular coordinate system shown in the figure, the width direction corresponds to the Y direction in the rectangular coordinate system, and the height direction corresponds to the Z direction in the rectangular coordinate system, and the X direction, Y direction, and Z direction are perpendicular to each other.

[0049] The frame assembly 100 is used to carry the power string assembly 200 so as to install the power string assembly 200 on the cabinet. As long as the structure can achieve the above purpose, it is within the scope of protection of this application. In some embodiments, the frame assembly 100 includes a frame plate 110, a base plate 120, an insulating beam 130, a mounting plate 140 and a fixing plate 150, wherein the frame plate 110 has two opposite side plates; along the height direction, the base plate 120 is installed at the bottom of the frame plate 110, and the insulating beam 130 is installed at the top of the frame plate 110; the fixing plate 150 and the mounting plate 140 are arranged on the frame plate 110, and the fixing plate 150 is used to install the semiconductor switch tube (Integrated Gate-Commutated Thyristor, abbreviated as IGCT) of the power string 210.

[0050] The frame plate 110 is used to form a side plate for mounting the power string 210. The frame plate 110 can have a rectangular structure, a U-shaped structure, or other structures with opposing side plates. In some embodiments, the frame plate 110 includes a first side plate 111, a second side plate 112, a third side plate 113, and a tie rod 114. The first side plate 111, the second side plate 112, and the third side plate 113 are sequentially connected; the first side plate 111 and the third side plate 113 are metal plates arranged opposite each other, and the second side plate 112 is an insulating plate; the tie rod 114 connects the first side plate 111 and the third side plate 113. Furthermore, the first side plate 111 and the third side plate 113 are aluminum alloy plates. The frame plate 110 is made of aluminum and insulating materials, resulting in a lightweight design that facilitates assembly and maintenance.

[0051] As can be seen, in the example of the present application, the first side panel 111, the second side panel 112, and the third side panel 113 can be connected end to end to form a U-shaped structure. To enhance the structure of the frame panel 110, a tie rod 114 is additionally provided. The tie rod 114 connects the first and third side panels 111, 113, which are arranged opposite each other. In the figure, there are two tie rods 114: one end of one tie rod 114 is connected to the first corner of the first side panel 111, and the other end is connected to the first corner of the third side panel 113; the other tie rod 114 has one end connected to the third corner of the first side panel 111, and the other end is connected to the third corner of the third side panel 113. In other words, the two tie rods 114 can be arranged diagonally between the first and third side panels 111, 113. This improves the connection strength of the frame panel 110 while minimizing the space occupied by the tie rods 114, further enhancing its compactness.

[0052] It should be noted here that the above-mentioned first side panel 111, second side panel 112 and third side panel 113 are all rectangular structures, and thus have four corners, which are the first corner, the second corner, the third corner and the fourth corner respectively, among which the first corner and the third corner are arranged diagonally, and the second corner and the fourth corner are arranged diagonally.

[0053] The above is a way of arranging the two pull rods 114 diagonally. In other examples of the present application, the two pull rods 114 can also be arranged adjacent to each other, for example, arranged at the first corner and the second corner, the second corner and the third corner, the third corner and the fourth corner, the fourth corner and the first corner, and so on.

[0054] This application describes the frame plate 110 as including a first side plate 111, a second side plate 112, and a third side plate 113. A capacitor 300 and a resistor 400 are provided on the outside of the second side plate 112. One end of the capacitor 300 is connected to the resistor 400, and the other end of the capacitor 300 is electrically connected to the O phase of the power string 210. It should be noted that the space corresponding to the power string 210 on the first side plate 111, the second side plate 112, and the third side plate 113 is considered internal, and the space opposite is considered external.

[0055] The capacitor 300 may be disposed outside the second side plate 112 via the capacitor support pins 330 , and the resistor 400 may be disposed outside the second side plate 112 via the resistor support pins 410 .

[0056] Since the power module needs to be installed in the cabinet, the mounting plate 140 is used to mount the entire power module on the cabinet. Mounting holes 145 are provided on the mounting plate 140. Any structure that has the aforementioned functions can be considered a mounting plate 140. The mounting plate 140 can be installed at any location on the frame plate 110. This is not specifically limited here. For example, it can be installed at the first side plate 111, the second side plate 112, the third side plate 113, and so on.

[0057] During actual installation, the base plate 120 and mounting plate 140 are typically aligned with the cabinet body. Therefore, the mounting plate 140 is typically placed at the bottom of the aforementioned side panels. Since the capacitor 300 and resistor 400 are located on the exterior of the first side panel 111, to prevent the power module from contacting the capacitor 300 and resistor 400 during installation, the fixing plate 150 is positioned opposite the second side panel 112 and is fixed to both the first side panel 111 and the third side panel 113.

[0058] To facilitate quick positioning, the exterior of the second side panel 112 is provided with locating pins 1121 that engage with the cabinet's locating holes. The entire power module is positioned using these locating pins 1121, and the mounting plate 140 is securely installed within the cabinet (positioning one end first and then securing the other end), making installation simple and maintenance-friendly.

[0059] As shown, the mounting plate 140 includes a first longitudinal mounting plate 141, a second longitudinal mounting plate 142, and a first transverse mounting plate 143. The first longitudinal mounting plate 141 and the second longitudinal mounting plate 142 are arranged opposite each other to connect to the first side plate 111 and the third side plate 113. The first transverse mounting plate 143 is disposed at the ends of the first longitudinal mounting plate 141 and the second longitudinal mounting plate 142. Each of the first longitudinal mounting plate 141, the second longitudinal mounting plate 142, and the first transverse mounting plate 143 is provided with mounting holes 145, which are circular or waist-shaped. The mounting holes 145 located in the first longitudinal mounting plate 141 and the second longitudinal mounting plate 142 are longer in the X direction than in the Y direction, while the mounting holes 145 located in the first transverse mounting plate 143 are longer in the Y direction than in the X direction. This allows the power module to be mounted in the cabinet with its X and Y positions adjusted within a limited range.

[0060] In order to improve the bearing capacity of the mounting plate 140 , the mounting plate 140 may further include a second transverse mounting plate 144 , one end of which is connected to the first longitudinal mounting plate 141 , and the other end of which is connected to the second longitudinal mounting plate 142 .

[0061] It should be noted that the above connections can be understood as detachable connections or non-detachable connections, wherein the detachable connection method is connected by screws, bolts and other connection methods; the non-detachable connection method can be welding, riveting, etc., and no more examples are given here.

[0062] The above introduction is about the installation of the mounting plate 140 and the cabinet body. Of course, in some examples of this application, the mounting plate 140 can also be hung on the cabinet body, which is not described in detail here.

[0063] The fixing plate 150 assists in mounting the semiconductor switch tubes of the power string 210 . To improve the compactness of the power module, the fixing plate 150 can be arranged on the same side as the mounting plate 140 , that is, opposite to the second side plate 112 .

[0064] When the mounting plate 140 is close to the side of the base plate 120, the fixing plate 150 can be arranged close to the side of the insulating beam 130. In other words, in the Z direction, the fixing plate 150 is located above the mounting plate 140, so that a layout space for accommodating semiconductor switches is formed between the fixing plate 150 and the mounting plate 140, thereby achieving the purpose of improving compactness.

[0065] As shown, the fixing plate 150 may include a first longitudinal fixing plate 151, a second longitudinal fixing plate 152, and a first transverse fixing plate 153. The first longitudinal fixing plate 151 and the second longitudinal fixing plate 152 are arranged opposite each other, and the first transverse fixing plate 153 is connected to the ends of the first longitudinal fixing plate 151 and the second longitudinal fixing plate 152. The semiconductor diode may be primarily mounted on the first transverse fixing plate 153.

[0066] In order to improve the connection strength of the above-mentioned fixing plate 150, the fixing plate 150 can also include a second horizontal fixing plate 154, which connects the first vertical fixing plate 151 and the second vertical fixing plate 152 on one side close to the insulating beam 130 to improve the support strength in the X direction.

[0067] Furthermore, the fixing plate 150 may further include a reinforcing plate 155 , which is connected between the second transverse fixing plate 154 and the first transverse fixing plate 153 to improve the supporting strength in the Y direction.

[0068] It should be noted that the connection between the above-mentioned first longitudinal fixing plate 151, the second longitudinal fixing plate 152, the first transverse fixing plate 153, the second transverse fixing plate 154, the angle plate 156 and / or the reinforcing plate 155 is a detachable connection or a non-detachable connection, wherein the detachable connection method is connected by screws, bolts and the like; the non-detachable connection method can be welding, riveting, etc., which are not given in detail here.

[0069] In addition, in order to further reduce the weight of the power module, the frame plate 110, the fixing plate 150, and the mounting plate 140 may be provided with weight-reducing holes to reduce the weight.

[0070] The above mainly introduces the structure of the frame assembly 100. The following specifically introduces the specific structure of the power string assembly 200:

[0071] The power string 210 of the present application includes a first insulating crimping block 211a, a first semiconductor switch tube 212a, a first heat sink 213a, a first diode module 214a, a second heat sink 213b, a second diode module 214b, a third heat sink 213c, a second semiconductor switch tube 212b and a second insulating crimping block 211b stacked together along the stacking direction, and the first semiconductor switch tube 212a and the second semiconductor switch tube 212b are connected to the fixed plate 150.

[0072] It should be noted that the above-mentioned first radiator 213a, second radiator 213b and third radiator 213c can be water-cooled radiators or air-cooled radiators. When they are water-cooled radiators, they are connected to the power source through an external pipeline; when they are air-cooled radiators, they can blow out heat.

[0073] The busbar mechanism 230 is a structure derived from or externally connected to electronic components such as the first semiconductor switch tube 212a, the first diode module 214a, the second diode module 214b, and the second semiconductor switch tube 212b.

[0074] In some embodiments, the busbar mechanism 230 includes a first busbar 231 and a second busbar 232. The first busbar 231 is crimped between the first insulating crimping block 211a and the first semiconductor switch 212a, and the second busbar 232 is crimped between the second semiconductor switch 212b and the second insulating crimping block 211b. The first busbar 231 and the second busbar 232 are connected to form phase O. When the first heat sink 213a, the second heat sink 213b, and the third heat sink 213c are air-cooled heat sinks, the second heat sink 213b extends to the third busbar 233, which is connected to the first busbar 231 and the second busbar 232 to form phase O.

[0075] The O phase is connected to the capacitor 300 via the fifth busbar 320 , and the capacitor 300 is connected to the resistor 400 via the fourth busbar 310 .

[0076] In addition, the first heat sink 213 a , the second heat sink 213 b and the third heat sink 213 c are connected to the first external bus bar, the second external bus bar and the third external bus bar in sequence, and the first external bus bar, the second external bus bar and the third external bus bar are all fixed on the insulating beam 130 .

[0077] The first busbar 231 , the second busbar 232 , the third busbar 233 , the fourth busbar 310 , the fifth busbar 320 , the first external busbar, the second external busbar and the third external busbar may be copper busbars, aluminum busbars and the like.

[0078] In order to facilitate the installation of the external busbar, a busbar pad 131 is provided between the insulating beam 130 and the external busbar to facilitate the external connection of cables.

[0079] To improve the reliability of the power string 210, the first insulating crimping block 211a, the first heat sink 213a, the second heat sink 213b, the third heat sink 213c, and the second insulating crimping block 211b are all hung on the insulating crossbeam 130 via hanging members along the height direction. In other words, the tops of the first insulating crimping block 211a, the first heat sink 213a, the second heat sink 213b, the third heat sink 213c, and the second insulating crimping block 211b are suspended from the insulating crossbeam 130.

[0080] There are two insulating beams 130, one of which is arranged close to the second side plate 112, and the other is arranged close to the fixing plate 150. There is an opening between the two insulating beams 130 to facilitate heat dissipation of the first radiator 213a, the second radiator 213b and the third radiator 213c.

[0081] Two hanging parts are set on the top of the first insulating crimping block 211a, the first heat sink 213a, the second heat sink 213b, the third heat sink 213c and the second insulating crimping block 211b, and are arranged close to two different insulating beams 130 respectively. By setting two hanging parts, the force is more evenly distributed.

[0082] It should be noted that the above-mentioned hanging member can be a rigid connector or a flexible connector, or both. In some embodiments, the hanging member includes a first mounting member, an elastic member, and a second mounting member, wherein the first mounting member is disposed on the insulating beam 130, the second mounting member is disposed on the component to be hung, one end of the elastic member is connected to the first mounting member, and the other end of the elastic member is connected to the second mounting member, and the component to be hung is the first insulating crimping block 211a, the first heat sink 213a, the second heat sink 213b, the third heat sink 213c, or the second insulating crimping block 211b.

[0083] It should be noted that the first mounting member and the second mounting member may be structures such as hanging holes or hooks arranged on the component to be hung.

[0084] The crimping mechanism 220 is used to crimp the entire power string 210 onto the opposing side panels. In some examples of the present application, the crimping mechanism 220 includes a guide post 221, a disc spring 222, a crimping head 223, a tapered block 224, and a fixing pin 225. The guide post 221 is mounted on one of the two side panels, the disc spring 222 is mounted on the outer periphery of the guide post 221, the crimping head 223 slides with the guide post 221, and the crimping head 223 abuts one end of the power string 210. The fixing pin 225 is provided on the other side panel and supports the other end of the power string 210. During crimping, the crimping head 223 presses against the tapered block 224, applying pressure to the entire power string 210.

[0085] In some embodiments, one end of the guide post 221 protrudes from the corresponding side panel, and the height of the guide post 221 extending into the side panel can be adjusted. Adjusting the height of the guide post 221 extending into the side panel adjusts the compression of the disc spring 222, thereby achieving crimping of the power string 210. Furthermore, the end of the guide post 221 that protrudes from the side panel is provided with a polygonal hole 2211. When crimping the power string 210, a tool is used to apply torque to the polygonal hole 2211. The polygonal hole 2211 can be triangular, square, hexagonal, or other shapes.

[0086] The height of the guide post 221 extending into the side panel can be adjusted. In some examples, the guide post 221 and the side panel are threaded together, and the height of the guide post 221 extending into the side panel can be adjusted by rotating the guide post 221, thereby adjusting the compression of the disc spring 222. In other examples, the height of the guide post 221 extending into the side panel is adjusted by using other locking members, such as a rotating nut. The guide post 221 is threadedly engaged with the rotating nut, and the rotating nut is embedded in the side panel. The height of the guide post 221 extending into the side panel can be adjusted by rotating the guide post 221.

[0087] It should be noted that the above-mentioned power module may be a medium-power level power module or a high-power level power module, and further a crowbar power module.

[0088] The present application provides a frequency converter, comprising a cabinet and a power module as described above, wherein the power module is installed in the cabinet. Since the power module has the above effects, the frequency converter including the power module has corresponding effects, which will not be described in detail here.

[0089] In some embodiments, the cabinet has an air duct, and the heat of the power module is forced to dissipate into the air duct. The power module itself does not need to be equipped with additional heat dissipation means.

[0090] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0091] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0092] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0093] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed, and is not intended to limit the present application. For those skilled in the art, various modifications and variations of the present application are possible. The scope of application involved in the present application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned application concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A power module, characterized in that: The invention comprises a frame assembly (100) and a power string assembly (200), wherein the power string assembly (200) comprises a power string (210), a crimping mechanism (220) and a busbar mechanism (230), wherein the crimping mechanism (220) crimps the centers of the two ends of the power string (210) between two opposite side plates inside the frame assembly (100) under the action of elastic force, and the busbar mechanism (230) is electrically connected to the power string (210).

2. The power module according to claim 1, wherein: The frame assembly (100) comprises a frame plate (110), a base plate (120), an insulating beam (130), a mounting plate (140) and a fixing plate (150), wherein the frame plate (110) has two opposite side plates; along the height direction, the base plate (120) is mounted on the bottom of the frame plate (110), and the insulating beam (130) is mounted on the top of the frame plate (110); the fixing plate (150) and the mounting plate (140) are arranged on the frame plate (110), and the fixing plate (150) is used to mount the semiconductor switch tube of the power string (210).

3. The power module according to claim 2, wherein: The frame plate (110) includes a first side plate (111), a second side plate (112), a third side plate (113) and a pull rod (114), wherein the first side plate (111), the second side plate (112) and the third side plate (113) are connected in sequence; the first side plate (111) and the third side plate (113) are metal plates arranged opposite to each other, and the second side plate (112) is an insulating plate; the pull rod (114) connects the first side plate (111) and the third side plate (113).

4. The power module according to claim 3, wherein: A capacitor (300) and a resistor (400) are provided outside the second side plate (112), one end of the capacitor (300) is connected to the resistor (400), and the other end of the capacitor (300) is electrically connected to the O phase of the power string (210).

5. The power module according to claim 3, wherein: The fixing plate (150) and the mounting plate (140) are both arranged opposite to the second side plate (112) and fixed to the first side plate (111) and the third side plate (113). Positioning pins are also provided on the outside of the second side plate (112) to cooperate with the positioning holes of the cabinet for positioning.

6. The power module according to claim 4, wherein: The power string (210) comprises a first insulating crimping block (211a), a first semiconductor switch tube (212a), a first heat sink (213a), a first diode module (214a), a second heat sink (213b), a second diode module (214b), a third heat sink (213c), a second semiconductor switch tube (212b), and a second insulating crimping block (211b) stacked together along a stacking direction; the first semiconductor switch tube (212a) and the second semiconductor switch tube (212b) are connected to the fixing plate (150).

7. The power module according to claim 6, wherein: The busbar mechanism (230) comprises a first busbar (231) and a second busbar (232); the first busbar (231) is crimped between the first insulating crimping block (211a) and the first semiconductor switch tube (212a); the second busbar (232) is crimped between the second semiconductor switch tube (212b) and the second insulating crimping block (211b); the first busbar (231) and the second busbar (232) are connected to form the O phase.

8. The power module according to claim 7, wherein: The first radiator (213a), the second radiator (213b) and the third radiator (213c) are air-cooled radiators; the second radiator (213b) leads to a third busbar (233); the third busbar (233) is connected to the first busbar (231) and the second busbar (232) to form the O phase; The first heat sink (213a), the second heat sink (213b) and the third heat sink (213c) are respectively externally connected to a first external bus bar (213a1), a second external bus bar (213b1) and a third external bus bar (213c1); the first external bus bar (213a1), the second external bus bar (213b1) and the third external bus bar (213c1) are all fixed on the insulating crossbeam (130).

9. The power module according to claim 6, wherein: Along the height direction, the first insulating crimping block (211a), the first heat sink (213a), the second heat sink (213b), the third heat sink (213c) and the second insulating crimping block (211b) are all hung on the insulating crossbeam (130) via hanging parts.

10. The power module according to claim 9, wherein: The hanging member comprises a first mounting member, an elastic member, and a second mounting member, wherein the first mounting member is arranged on the insulating beam (130), the second mounting member is arranged on the component to be hung, one end of the elastic member is connected to the first mounting member, and the other end of the elastic member is connected to the second mounting member, and the component to be hung is the first insulating crimping block (211a), the first radiator (213a), the second radiator (213b), the third radiator (213c), or the second insulating crimping block (211b).

11. The power module according to any one of claims 1 to 10, characterized in that: The crimping mechanism comprises a guide post (221), a disc spring (222), a crimping head (223), a tapered block (224) and a fixing pin (225), wherein the guide post (221) is sleeved on one of the two side plates, the disc spring (222) is sleeved on the outer periphery of the guide post (221), the crimping head (223) is slidably engaged with the guide post (221), and the crimping head (223) abuts against one end of the power string (210), and the fixing pin (225) is provided on the other side plate and abuts against the other end of the power string (210).

12. The power module according to claim 11, wherein: One end of the guide column (221) is exposed from the corresponding side plate, and the guide column (221) is threadedly engaged with the side plate.

13. The power module according to any one of claims 1 to 10, characterized in that: The power module is a crowbar power module.

14. A frequency converter, characterized in that: The utility model comprises a cabinet and a power module according to any one of claims 1 to 13, wherein the power module is installed in the cabinet.

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