Frequency converter

Abstract

The utility model provides a frequency converter. The frequency converter comprises a heat dissipation base, a shell, an IGBT assembly, a control assembly and a driving assembly. The heat dissipation base comprises a substrate part and a fin part, and the fin part is arranged on one side of the substrate part; a shell of the frequency converter is arranged on the heat dissipation base in a sleeving mode, a containing cavity is formed under the enclosure of the shell and the heat dissipation base, and the IGBT assembly, the control assembly and the driving assembly are all arranged in the containing cavity. The IGBT assembly is in contact with the other side of the substrate portion. The fin part of the heat dissipation base is located on the outer side of the containing cavity, one end of the driving assembly corresponds to the IGBT assembly, and the other end of the driving assembly extends into the containing cavity, so that the space in the containing cavity is fully utilized, and the structure of the frequency converter is more compact. And the control assembly is electrically connected with the driving assembly and is also arranged in the accommodating cavity, so that the structural compactness of the frequency converter is further improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electrical equipment, and more particularly to a frequency converter. BACKGROUND

[0002] Traditional frequency converters often need to reserve a larger space for heat dissipation components, such as heat dissipation fans, heat dissipation fins, etc., to ensure effective heat dissipation. Although it ensures the stable operation of the frequency converter to a certain extent, it inevitably leads to the bulkiness and lack of compactness of the overall structure of the frequency converter.

[0003] With the increasing demand of modern industry for equipment miniaturization and integration, the traditional frequency converter is difficult to meet the space limitation of some specific application scenarios due to its large size. The traditional frequency converter obviously cannot adapt to the new development needs. CONTENT OF THE INVENTION

[0004] The purpose of the embodiment of the application is to provide a frequency converter to solve the technical problem of low structural compactness of the frequency converter in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the application is:

[0006] A frequency converter is provided, comprising:

[0007] A heat dissipation base comprising a substrate part and a fin part, the fin part being arranged on one side of the substrate part;

[0008] A housing is sleeved on the heat dissipation base, the housing and the heat dissipation base form a containing cavity, and the fin part is located outside the containing cavity;

[0009] An IGBT assembly is connected to the other side of the substrate part and in contact with the substrate part;

[0010] A driving assembly corresponds to the IGBT assembly at one end and extends to the containing cavity at the other end;

[0011] A control assembly is arranged in the containing cavity and electrically connected to the driving assembly.

[0012] As a further improvement of the above technical solution:

[0013] Optionally, the heat dissipation base further comprises a column part, the column part is arranged on one side of the fin part and extends along the plane direction of the substrate part; one end of the column part is connected to the fin part, and the control assembly is supported at the other end of the column part.

[0014] Optionally, the heat insulation plate comprises a flat plate part and a vertical plate part, the flat plate part is connected to the fin part, one end of the vertical plate part is connected to the flat plate part, and the other end of the vertical plate part is supported on the control assembly.

[0015] Optionally, the fin part is provided with a slot, one end of the slot is an insertion end, the other end of the slot is a buckle end, the flat plate part is further provided with a clamping hook, and when the flat plate part is inserted into the slot, the clamping hook is clamped on the buckle end.

[0016] Optionally, the IGBT assembly comprises a rectifier bridge, an IGBT single tube, and a heat-conducting insulation film, the rectifier bridge is in contact with the substrate part, one side of the heat-conducting insulation film is in contact with the substrate part, the other side of the heat-conducting insulation film is in contact with the IGBT single tube, and the IGBT single tube is electrically connected with the driving assembly.

[0017] Optionally, the driving assembly comprises a driving plate and a capacitor, one end of the driving plate corresponds to the IGBT assembly, the other end of the driving plate extends to the accommodating cavity, the capacitor is connected to the driving plate and arranged in the accommodating cavity.

[0018] Optionally, the driving assembly further comprises a terminal plate, the terminal plate is arranged in the accommodating cavity and electrically connected with the driving plate, one end of the terminal plate is supported on the column part, and the other end of the terminal plate is supported on the driving plate.

[0019] Optionally, the side edge of the driving plate is provided with a supporting protrusion, the supporting protrusion corresponds to the supporting height of the column part, one end of the column part is supported on the control assembly, and the other end of the column part is supported on the control assembly.

[0020] Optionally, the control assembly comprises a control plate and an insulation cover, one end of the column part is supported on the control plate, the other end of the column part is supported on the control plate, one side of the control plate is an assembly surface, the other end surface of the control plate is a welding surface, and the insulation cover is arranged on the specified area of the welding surface.

[0021] Optionally, the driving assembly further comprises a terminal insulation sleeve, the terminal insulation sleeve is arranged between the terminal plate and the heat dissipation base, one end of the terminal insulation sleeve is sleeved on the heat dissipation base, and the other end of the terminal insulation sleeve is supported on the terminal plate.

[0022] Optionally, a panel assembly and an end cover are further included, the panel assembly comprises a panel and a knob, the panel is attached to the shell, the knob is rotatably installed on the panel and drivingly connected with the adjusting element on the control assembly.

[0023] The end cover is connected to the shell, and the cover is arranged on the assembly surface of the control panel.

[0024] The frequency converter provided by the application has the following beneficial effects:

[0025] The frequency converter provided by the application comprises a heat dissipation base, a shell, an IGBT assembly, a control assembly and a driving assembly. The heat dissipation base comprises a substrate part and a fin part. The fin part is arranged on one side of the substrate part. The shell of the frequency converter is sleeved on the heat dissipation base, and a containing cavity is formed under the enclosure of the shell and the heat dissipation base. The IGBT assembly, the control assembly and the driving assembly are all arranged in the containing cavity. Not only are the IGBT assembly, the control assembly and the driving assembly effectively protected from the interference of the external environment, but also the above-mentioned functional assemblies are compactly arranged in the containing cavity, so as to improve the structural compactness of the frequency converter. The fin part is located outside the containing cavity, so as to facilitate the cleaning of dust accumulated on the heat dissipation base. The IGBT assembly is connected to the other side of the substrate part and in contact with the substrate part. As the main heat source in the frequency converter, the IGBT assembly is directly in contact with the other side of the substrate part, so as to shorten the heat transfer path of the IGBT assembly and accelerate the heat dissipation speed of the IGBT assembly, thereby ensuring that the IGBT assembly is cooled in time. One end of the driving assembly corresponds to the IGBT assembly, and the other end of the driving assembly extends into the containing cavity, so as to make full use of the space in the containing cavity and make the structure of the frequency converter more compact. The control assembly is electrically connected with the driving assembly and is also arranged in the containing cavity, thereby further improving the structural compactness of the frequency converter. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Figure 1 The three-dimensional structure schematic diagram of the frequency converter provided by the application is shown in the figure.

[0028] Figure 2 The exploded structure schematic diagram of the frequency converter provided by the application is shown in the figure.

[0029] Figure 3 The local enlarged structure schematic diagram of the frequency converter provided by the application is shown in the figure. Figure 1

[0030] Figure 4 The local enlarged structure schematic diagram of the frequency converter provided by the application is shown in the figure. Figure 2

[0031] Figure 5 ​​A perspective view of a heat insulation plate of a frequency converter according to the present application is provided.

[0032] Figure 6 A perspective view of a drive assembly of a frequency converter according to the present application is provided. Figure 3

[0033] A perspective view of a control assembly of a frequency converter according to the present application is provided. Figure 7

[0034] A perspective view of a drive assembly of a frequency converter according to the present application is provided. Figure 8 Figure 4 A perspective view of a control assembly of a frequency converter according to the present application is provided.

[0035] Figure 9 In the drawings, reference numerals:

[0036] 1, heat dissipation base; 11, base plate part; 12, fin part; 121, slot; 13, stand part;

[0037] 2, housing;

[0038] 3, IGBT assembly; 31, rectifier bridge; 32, IGBT single tube; 33, heat conductive insulation film;

[0039] 4, control assembly; 41, control board; 42, insulation cover;

[0040] 5, drive assembly; 51, drive board; 511, support protrusion; 52, terminal plate; 53, terminal insulation sleeve; 54, capacitor;

[0041] 6, heat insulation plate; 61, flat plate part; 611, hook; 62, vertical plate part;

[0042] 7, panel assembly; 71, panel; 72, knob;

[0043] 8, end cover.

[0044] Specific embodiments The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0045]

[0046] ​​In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0047] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0048] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0050] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that ordinary skilled persons in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of the utility model disclosed.

[0051] In the following description, suffixes such as "circuit", "component", "assembly" or "unit" are used only for the convenience of description of the present application, and have no specific meaning in themselves. Therefore, they can be used mixedly.

[0052] The present application will be further described in detail below with the specific embodiments in conjunction with the drawings.

[0053] As shown in Figure 1 and Figure 2 The present application provides a frequency converter, which comprises a heat dissipation base 1, a shell 2, an IGBT assembly 3, a control assembly 4 and a driving assembly 5.

[0054] The heat dissipation base 1 is used as a heat dissipation component of the frequency converter, which comprises a substrate part 11 and a fin part 12. The substrate part 11 is used for mounting various electronic devices, and the fin part 12 is arranged on one side of the substrate part 11. The fin part 12 comprises a plurality of fins arranged at intervals, and is used for increasing the heat dissipation area of the heat dissipation base 1, thereby improving the heat dissipation efficiency of the heat dissipation base 1. The heat dissipation base 1 is formed by using aluminum alloy material.

[0055] The shell 2 of the frequency converter is sleeved on the heat dissipation base 1, and a containing cavity is formed under the enclosure of the shell 2 and the heat dissipation base 1. The IGBT assembly 3, the control assembly 4 and the driving assembly 5 are arranged in the containing cavity, which not only effectively protects the internal IGBT assembly 3, the control assembly 4 and the driving assembly 5 from the interference of the external environment, but also makes the above functional assemblies compactly arranged in the containing cavity, thereby facilitating the improvement of the structural compactness of the frequency converter. The fin part 12 is located outside the containing cavity. Since dust is inevitably accumulated on the heat dissipation base 1, the fin part 12 of the heat dissipation base 1 is located outside the containing cavity, thereby forming open heat dissipation and directly forming convection with the external air, thereby achieving self-cooling effect. On the one hand, this arrangement effectively isolates the internal functional assemblies from the external environment, thereby reducing the influence of dust, moisture and other adverse factors on the performance of the frequency converter. On the other hand, since the fin part 12 is directly arranged outside the containing cavity, the dust on the fin part 12 can be directly cleaned outside without disassembling the equipment, thereby facilitating the daily cleaning and maintenance of the heat dissipation base 1.

[0056] The IGBT assembly 3 is connected to the other side of the substrate part 11 and in contact with the substrate part 11. The IGBT assembly 3 is the most important heat source in the frequency converter, which is directly in contact with the other side of the substrate part 11. The heat transfer path of the IGBT assembly 3 is shortened by the direct contact heat conduction mode, thereby accelerating the heat dissipation speed of the IGBT assembly 3 and ensuring that the IGBT assembly 3 is cooled in time.

[0057] One end of the driving assembly 5 corresponds to the IGBT assembly 3, and the other end of the driving assembly 5 extends into the accommodating cavity, so as to make full use of the space in the accommodating cavity, and make the structure of the frequency converter more compact.

[0058] The control assembly 4 is electrically connected with the driving assembly 5, and is also arranged in the accommodating cavity, further improving the compactness of the structure of the frequency converter.

[0059] As shown in Figure 3 and Figure 6 In one specific embodiment of the present application, the heat dissipation base 1 further comprises a column part 13. The column part 13 is arranged on one side of the fin part 12 and extends along the plane direction of the base plate part 11. One end of the column part 13 is connected to the fin part 12, and the control assembly 4 is supported on the other end of the column part 13. The column part 13 not only enhances the overall structural strength of the heat dissipation base 1, but also provides a support base for the control assembly 4, improving the support stability of the control assembly 4.

[0060] As shown in Figures 3 to 5 In one specific embodiment of the present application, the frequency converter further comprises a heat insulation plate 6. The heat insulation plate 6 comprises a flat plate part 61 and a vertical plate part 62. The flat plate part 61 is connected to the fin part 12 to realize the isolation between the accommodating cavity and the fin part 12. The flat plate part 61 can also be used to provide support for the wiring strength of the terminal block of the control assembly 4. One end of the vertical plate part 62 is connected to the flat plate part 61, and the other end of the vertical plate part 62 is supported on the control assembly 4, further improving the support stability of the control assembly 4.

[0061] As shown in Figures 3 to 5 In one specific embodiment of the present application, the fin part 12 is provided with a slot 121. One end of the slot 121 is an insertion end, and the other end of the slot 121 is a buckle end. The flat plate part 61 is also provided with a hook 611. When the flat plate part 61 is inserted into the slot 121, the hook 611 can be buckled to the buckle end, so as to prevent the flat plate part 61 from being withdrawn from the slot 121, and realize the fixation of the flat plate part 61 and the fin part 12.

[0062] As shown in Figure 6 In one specific embodiment of the present application, the IGBT assembly 3 specifically comprises a rectifier bridge 31, an IGBT single tube 32 and a heat-conducting insulation film 33. The rectifier bridge 31 and the IGBT single tube 32 are the main heat generating components in the IGBT assembly 3. In order to realize better heat dissipation of the rectifier bridge 31, the rectifier bridge 31 is directly contacted with the base plate part 11, so as to shorten the heat transfer path of the rectifier bridge 31, thereby accelerating the heat dissipation speed of the rectifier bridge 31.

[0063] Generally, the current flowing through the IGBT single tube 32 is large, the switching frequency is high, and the heat generated by the IGBT single tube 32 is more concentrated. In order to ensure the heat dissipation effect of the IGBT single tube 32, a heat-conducting insulating film 33 is fixed on the substrate part 11 by a hot pressing process, and the IGBT single tube 32 is installed in contact with the other side of the heat-conducting insulating film 33. The heat-conducting insulating film is made of a material with high heat conductivity, high voltage resistance and good insulation performance. It can not only effectively transfer the heat generated by the IGBT single tube 32, but also maintain stable insulation performance in a high-voltage environment, thereby ensuring the smooth heat conduction and heat radiation between the IGBT single tube 32 and the substrate part 11. The IGBT single tube 32 is electrically connected with the driving board 51.

[0064] As shown in Figure 2 and Figure 7 , the driving assembly 5 specifically includes a driving board 51 and a capacitor 54. One end of the driving board 51 corresponds to the IGBT assembly 3, and the other end of the driving board 51 extends to the accommodating cavity. The capacitor 54 is connected to the driving board 51 and arranged in the accommodating cavity, thereby fully utilizing the space in the accommodating cavity and making the structure of the frequency converter more compact.

[0065] As shown in Figure 7 and Figure 8 , in one specific embodiment of the present application, the driving assembly 5 specifically further includes a terminal plate 52 arranged in the accommodating cavity. The driving board 51 is arranged opposite to the substrate part 11 to minimize the distance between them, thereby effectively reducing the overall thickness of the frequency converter and making the overall structure of the frequency converter more compact. The terminal plate 52 is arranged opposite to the fin part 12. In order to install the terminal plate 52, a mounting clamping groove is arranged on the column part 13. One end of the terminal plate 52 is clamped in the mounting clamping groove, and the other end of the terminal plate 52 is supported on the driving board 51, thereby reducing the additional support structure of the terminal plate 52 and making the structure of the driving assembly 5 more compact. The terminal plate 52 specifically includes an input terminal plate and an output terminal plate. The input terminal plate provides an input of external power supply for the frequency converter; the output terminal plate provides a required controllable power output for the electrical appliance. The input terminal plate and the output terminal plate are welded and fixed to the driving board 51 by a gold finger and electrically connected.

[0066] As shown in Figure 7 and Figure 8As shown in the drawings, in one specific embodiment of the present application, the side edge of the driving plate 51 is provided with a support protrusion 511 corresponding to the support height of the column portion 13. In the assembly process, the column portion 13 is supported at one end of the control assembly 4, and the other end of the control assembly 4 is provided with a support hole, and the support protrusion 511 is supported in the support hole to form support for the other end of the control assembly 4. The support protrusion 511 is provided on the driving plate 51 to support the control assembly 4, which can utilize the structural characteristics of the driving plate 51 itself to avoid the use of additional support components, thereby making the structure between the control assembly 4 and the driving assembly 5 more compact.

[0067] As shown in the drawings, Figure 9 In one specific embodiment of the present application, the control assembly 4 includes a control plate 41 and an insulating cover 42. Specifically, the column portion 13 is supported at one end of the control plate 41, and the support protrusion 511 is supported at the other end of the control plate 41. One side of the control plate 41 is an assembly surface on which various chips, resistors and other electronic components are mounted. The other end surface of the control plate 41 is a welding surface on which the pins and welding points of each electronic component are provided. The assembly surface is arranged opposite to the fin portion 12 so that each electronic component on the assembly surface is as far away from the fin portion 12 or the driving assembly 5 as possible, thereby protecting each electronic component on the control plate 41. The welding surface is arranged facing the fin portion 12, and the insulating cover 42 is arranged on the welding surface and faces the welding surface. The insulating cover 42 is specifically made of high-temperature nylon plastic material and has a higher breakdown voltage than air, so that the electrical safety between the control assembly 4 and its adjacent components can be ensured under the premise that the gap between the welding surface and the fin portion 12 or the driving assembly 5 is as small as possible and the structure of the frequency converter is as compact as possible.

[0068] As shown in the drawings, Figure 6 In one specific embodiment of the present application, in order to avoid the driving assembly 5 breaking through the air between it and the heat dissipation base 1, the driving assembly 5 further includes a terminal insulating sleeve 53. The terminal insulating sleeve 53 is arranged between the terminal plate 52 and the heat dissipation base 1, one end of the terminal insulating sleeve 53 is sleeved on the heat dissipation base 1, and the other end of the terminal insulating sleeve 53 is supported on the terminal plate 52. The terminal insulating sleeve 53 is also made of high-temperature nylon plastic material and has a higher breakdown voltage than air, so that the terminal insulating sleeve 53 can act as an insulating barrier between the terminal plate 52 and the heat dissipation base 1 to prevent voltage from breaking through between the pins of the terminal plate 52 and the heat dissipation base 1. The electrical safety between the terminal plate 52 and the heat dissipation base 1 can be ensured under the premise that the gap between the terminal plate 52 and the heat dissipation base 1 is as small as possible, and the gap between the terminal plate 52 and the heat dissipation base 1 can be minimized to improve the space utilization.

[0069] As shown in the drawings, Figure 1 and Figure 2As shown, in one specific embodiment of this application, the frequency converter further includes a panel assembly 7, which includes a panel 71 and a knob 72. The panel 71 is a visual carrier for human-machine interaction and is attached to the housing 2. The knob 72 is rotatably mounted on the panel 71 and is drivenly connected to an adjustment element, such as a rotary switch, on the control assembly 4 to control the adjustment element.

[0070] like Figure 1 and Figure 2 As shown, in one specific embodiment of this application, the frequency converter further includes an end cover 8, which is connected to the housing 2 and covers the component surface of the control board 41. The end cover 8 specifically includes a face cover, a mesh cover, and control terminal labels. The mesh cover is hinged to the face cover to open or close when necessary. Both the face cover and the mesh cover are made of plastic. The control terminal labels provide supplementary explanations of the wiring functions of the control board terminal blocks, facilitating user identification of product wiring operations.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A frequency converter, characterized in that The application relates to a heat dissipation base (1), a shell (2), an IGBT assembly (3), a driving assembly (5) and a control assembly (4). The heat dissipation base (1) further comprises a column part (13) arranged on one side of the fin part (12) and extending along the plane direction of the substrate part (11); one end of the column part (13) is connected to the fin part (12), and the control assembly (4) is supported on the other end of the column part (13). The fin part (12) is provided with a slot (121), one end of the slot (121) is an insertion end, the other end of the slot (121) is a buckle end, the flat plate part (61) is further provided with a hook (611), and when the flat plate part (61) is inserted into the slot (121), the hook (611) is buckled on the buckle end. The IGBT assembly (3) comprises a rectifier bridge (31), an IGBT single tube (32) and a heat-conducting insulation film (33), the rectifier bridge (31) is in contact with the substrate part (11), one side of the heat-conducting insulation film (33) is in contact with the substrate part (11), the other side of the heat-conducting insulation film (33) is in contact with the IGBT single tube (32), and the IGBT single tube (32) is electrically connected with the driving assembly (5). The driving assembly (5) further comprises a terminal plate (52), the terminal plate (52) is arranged in the accommodating cavity and is electrically connected with the driving plate (51), one end of the terminal plate (52) is supported on the column part (13), and the other end of the terminal plate (52) is supported on the driving plate (51). The driving assembly (5) further comprises a terminal plate (52), the terminal plate (52) is arranged in the accommodating cavity and is electrically connected with the driving plate (51), one end of the terminal plate (52) is supported on the column part (13), and the other end of the terminal plate (52) is supported on the driving plate (51).

2. The frequency converter of claim 1, wherein, ​ 3. The frequency converter of claim 1, wherein, ​ 4. The frequency converter of claim 3, wherein, ​ 5. The frequency converter of claim 2, wherein, ​ 6. The frequency converter of claim 5, wherein, ​ 7. The frequency converter of claim 6, wherein, ​ 8. The frequency converter of claim 7, wherein, The side edge of the driving plate (51) is provided with a support protrusion (511), the support protrusion (511) corresponds to the support height of the column part (13), the column part (13) is supported at one end of the control assembly (4), and the support protrusion (511) is supported at the other end of the control assembly (4).

9. The frequency converter of claim 8, wherein, The control assembly (4) comprises a control plate (41) and an insulating cover (42), the column part (13) is supported at one end of the control plate (41), the support protrusion (511) is supported at the other end of the control plate (41), one side of the control plate (41) is an assembly surface, the other end surface of the control plate (41) is a welding surface, and the insulating cover (42) covers a specified area of the welding surface.

10. The frequency converter of claim 7, wherein, The driving assembly (5) further comprises a terminal insulating sleeve (53), the terminal insulating sleeve (53) is arranged between the terminal plate (52) and the heat dissipation base (1), one end of the terminal insulating sleeve (53) is sleeved on the heat dissipation base (1), and the other end of the terminal insulating sleeve (53) is supported on the terminal plate (52).

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