EMC (Electro Magnetic Compatibility) module mounting structure for variable frequency controller

Abstract

The utility model relates to an EMC module installation structure used for a frequency conversion controller in the controller field, comprising a housing, a PCB assembly and an EMC assembly, the housing comprises a lower cover and an upper cover, a PCB accommodation groove is arranged on the surface of the lower cover, an EMC accommodation groove is arranged on the surface of the upper cover, the EMC assembly is arranged in the accommodation groove, the EMC assembly comprises a control circuit board, a common mode inductor and a capacitor, and the control circuit board is connected with the common mode inductor. An input terminal is arranged in the lower cover, the lower cover and the input terminal are integrally formed through an insert injection molding technology, a pin hole is formed in the EMC containing groove, a connecting piece is arranged at one end of the input terminal, the upper cover and the lower cover are connected through a bolt, and after the upper cover and the lower cover are combined, the connecting piece extends into the EMC containing groove to be electrically connected with the control circuit board. The end, close to the upper cover, of the input terminal is provided with the connecting screw hole, the bolt penetrates through the upper cover and the connecting piece to be screwed into the connecting screw hole, the occupied space of the controller installed in the electric tool is saved, and due to the fact that the EMC assembly and the PCB assembly are installed in the same shell, the controller is more convenient to disassemble and assemble.

Description

Technical Field

[0001] This utility model relates to the field of controllers, and in particular to an EMC module mounting structure for frequency converters. Background Technology

[0002] A power tool controller is a device that controls the mechanical quantities, working sequence, and operating mode of a power tool by controlling its electrical parameters. It is primarily connected to the brushless motor within the power tool. With the continuous advancement of lithium battery technology and the evolving needs of consumers, the power tool industry is showing a trend towards cordless operation, lithium battery integration, integration, and intelligence. As a core component of power tools, the controller plays a crucial role in driving this trend.

[0003] like Figure 1 As shown, the structure of a commercially available power tool controller includes a PCB assembly 1, a switch 3, and an EMC assembly 2. The EMC assembly 2 is connected to the PCB assembly 1 via two input lines 5. The motor is connected to the PCB assembly 1 via three output lines 4. The switch 3 is connected to the PCB assembly 1 via a ribbon cable. The PCB assembly 1 and the EMC assembly 2 are respectively housed in two housings 6.

[0004] In existing controllers, the EMC component and PCB component are housed in two separate housings and connected by two input lines. This results in a large overall controller size, which takes up a lot of space and is inconvenient to install on power tools. It is necessary to fix the EMC component and PCB component separately inside the power tool. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides an EMC module mounting structure for frequency converters, which can effectively solve the technical problem of large space occupation when EMC components are installed in power tools.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An EMC module mounting structure for a frequency converter includes a housing, a PCB assembly, and an EMC assembly. The EMC assembly is electrically connected to the PCB assembly. The housing has a PCB receiving slot, in which the PCB assembly is housed. The housing includes a lower cover and an upper cover, with a sealing groove at the junction of the upper and lower covers. This groove can be filled with sealant for waterproofing. The PCB receiving slot is located on the surface of the lower cover, and the surface of the upper cover has an EMC receiving slot. The EMC assembly is housed within this slot. The EMC assembly includes a control circuit board, a common-mode inductor, and a capacitor. The inductor and capacitor are soldered onto the surface of the control circuit board. The input terminal is located in the lower cover, which is integrally formed with the input terminal through an insert injection molding process. The EMC housing has pin holes, and one end of the input terminal can pass through and extend into the PCB housing to connect with the PCB assembly. The other end of the input terminal has a connecting piece. The upper and lower covers are connected by bolts. After the upper and lower covers are combined, the connecting piece extends into the EMC housing and is electrically connected to the control circuit board. The end of the input terminal near the upper cover has a connecting screw hole, and the bolt passes through the upper cover and the connecting piece and is tightened into the connecting screw hole.

[0008] Furthermore, the control circuit board is provided with pin sockets, and the end of the connecting piece away from the input terminal extends to the EMC receiving groove and passes through the pin sockets. The connecting piece and the control circuit board are fixedly connected by soldering.

[0009] Furthermore, the EMC receiving groove is provided with sealant. After the control circuit board is placed in the EMC receiving groove and electrically connected to the connecting piece, the EMC component is fixed in the EMC receiving groove by sealing with sealant.

[0010] Furthermore, the encapsulant is used to immerse the control circuit board, while the common mode inductors and capacitors are only immersed in their pins, with their surfaces exposed to the air.

[0011] Furthermore, the surface of the upper cover is provided with a sealing hole, and bolts are passed through the sealing hole and tightened to the input terminal. A removable sealing cap is provided at the opening of the sealing hole.

[0012] Furthermore, the PCB receiving groove is provided with sealant, which immerses the bottom of the PCB assembly.

[0013] Furthermore, the sidewall of the EMC receiving groove is provided with positioning buckles and support ribs, which respectively press the two sides of the control circuit board to fix the control circuit board in the EMC receiving groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: It is provided with an upper cover and a lower cover. The upper cover is provided with an EMC receiving groove, in which the EMC component can be installed. The lower cover is provided with an input terminal, through which the EMC component is electrically connected to the PCB component. This saves the space occupied by the power tool. Since the EMC component and the PCB component are installed in the same housing, it is more convenient to disassemble and assemble the controller with the power tool. The input terminal is integrally formed with the lower cover. One end of the input terminal is electrically connected to the EMC component through a connecting piece, which makes the connection between the EMC component and the PCB component more stable. The connecting piece can fix the EMC component in the EMC receiving groove. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the prior art;

[0016] Figure 1 Numbering: 1-PCB assembly, 2-EMC assembly, 3-switch, 4-output line, 5-input line, 6-housing.

[0017] Figure 2 This is a schematic diagram of the structure of this utility model;

[0018] Figure 3 This is an exploded view of the structure of this utility model;

[0019] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0020] Figure 5 This is a schematic diagram of the input terminal structure in this utility model;

[0021] Figures 2-5 Number of components: 1-Outer shell, 101-Upper cover, 1011-Sealing hole, 102-Lower cover, 2-PCB assembly, 3-EMC assembly, 301-Control circuit board, 3011-Pin socket, 302-Common mode inductor, 303-Capacitor, 4-Sealing adhesive, 5-EMC receiving groove, 501-Positioning buckle, 502-Support rib, 503-Pin hole, 6-Input terminal, 601-Connecting screw hole, 7-Connecting piece, 8-Bolt, 9-Sealing cap. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The following is combined Figures 2-5 The following is a detailed description of the EMC module mounting structure for a frequency converter according to this invention:

[0024] An EMC module mounting structure for a frequency converter includes a housing 1, a PCB assembly 2, and an EMC assembly 3. The EMC assembly 3 is electrically connected to the PCB assembly 2. A PCB receiving slot is provided on the housing 1, and the PCB assembly 2 is disposed within the PCB receiving slot. The housing 1 includes a lower cover 102 and an upper cover 101. A sealing groove is provided at the junction of the upper cover 101 and the lower cover 102. The groove can be filled with sealant for waterproofing. The PCB receiving slot is located on the surface of the lower cover 102, and an EMC receiving slot 5 is provided on the surface of the upper cover 101. The EMC assembly 3 is disposed within the receiving slot. The EMC assembly 3 includes a control circuit board 301, a common-mode inductor 302, and a capacitor 303. The common-mode inductor 302 and the capacitor 303... The upper cover 101 and the lower cover 102 are soldered onto the surface of the control circuit board 301. The lower cover 102 is integrally formed with the input terminal 6 by insert injection molding process. The EMC receiving groove 5 is provided with a pin hole 503. One end of the input terminal 6 can pass through and extend into the PCB receiving groove to connect with the PCB assembly 2. The other end of the input terminal 6 is provided with a connecting piece 7. The upper cover 101 and the lower cover 102 are connected by bolts 8. After the upper cover 101 and the lower cover 102 are combined, the connecting piece 7 extends into the EMC receiving groove 5 and is electrically connected to the control circuit board 301. The end of the input terminal 6 near the upper cover 101 is provided with a connecting screw hole 601. The bolt 8 passes through the upper cover 101 and the connecting piece 7 and is tightened into the connecting screw hole 601.

[0025] The control circuit board 301 is provided with a pin socket 3011. The end of the connecting piece 7 away from the input terminal 6 extends to the EMC receiving groove 5 and passes through the pin socket 3011. The connecting piece 7 and the control circuit board 301 are fixedly connected by welding. After welding, the control circuit board 301 can be locked in the EMC receiving groove 5 by the connecting piece 7. The side wall of the EMC receiving groove 5 is provided with a positioning buckle 501 and a support rib 502. When the control circuit board 301 is installed in the EMC receiving groove 5, the positioning buckle 501 and the support rib 502 press against the two sides of the control circuit board 301 respectively, so that the control circuit board 301 is fixed in the EMC receiving groove 5, and the control circuit board 301 is prevented from shifting during welding.

[0026] The EMC receiving tank 5 is equipped with a sealant 4. After the control circuit board 301 is placed in the EMC receiving tank 5 and electrically connected to the connecting piece 7, the EMC assembly 3 is fixed in the EMC receiving tank 5 by the sealant 4. The sealant 4 submerges the control circuit board 301, while the common mode inductor 302 and capacitor 303 only submerge their pins, leaving the surfaces of the common mode inductor 302 and capacitor 303 exposed to the air to improve heat dissipation efficiency. The PCB receiving tank is also equipped with a sealant 4, which submerges the bottom of the PCB assembly 2. Through the submersion of the sealant 4, the PCB assembly 2 and the EMC assembly 3 are further fixed and their shock resistance is enhanced. At the same time, the use of the sealant 4 also provides protection against moisture and dust, extending the service life of the controller.

[0027] The surface of the upper cover 101 is provided with a sealing hole 1011. The bolt 8 passes through the sealing hole 1011 and is tightened to the input terminal 6. A removable sealing cap 9 is provided at the opening of the sealing hole 1011 to prevent the bolt 8 from being corroded by moisture in the air, and to protect the bolt 8 while preventing other conductive objects from contacting the bolt 8.

[0028] The EMC module mounting structure for the frequency converter controller in this embodiment includes an upper cover 101 and a lower cover 102. The upper cover 101 has an EMC receiving slot 5, in which the EMC component 3 can be installed. The lower cover 102 has an input terminal 6, through which the EMC component 3 is electrically connected to the PCB component 2, saving space occupied by installation in power tools. Since the EMC component 3 and the PCB component 2 are installed in the same housing 1, the disassembly and assembly of the controller and power tools are more convenient. The input terminal 6 is integrally formed with the lower cover 102, and one end of the input terminal 6 is electrically connected to the EMC component 3 via a connecting piece 7, making the connection between the EMC component 3 and the PCB component 2 more stable. The connecting piece 7 can fix the EMC component 3 in the EMC receiving slot 5. The functions and working principles of the PCB component 2 and the EMC component 3 are common knowledge and conventional techniques in the art, and those skilled in the art know or can easily obtain relevant information, so they will not be described in detail here.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An EMC module mounting structure for a frequency converter, comprising a housing, a PCB assembly, and an EMC assembly, wherein the EMC assembly is electrically connected to the PCB assembly, the housing has a PCB receiving slot, and the PCB assembly is disposed in the PCB receiving slot, characterized in that: The housing includes a lower cover and an upper cover. A PCB receiving slot is provided on the surface of the lower cover, and an EMC receiving slot is provided on the surface of the upper cover. An EMC component is disposed in the receiving slot. The EMC component includes a control circuit board, a common mode inductor, and a capacitor. The common mode inductor and capacitor are soldered to the surface of the control circuit board. An input terminal is provided in the lower cover. The lower cover is integrally formed with the input terminal by an insert injection molding process. A pin hole is provided in the EMC receiving slot. One end of the input terminal can pass through and extend into the PCB receiving slot to connect with the PCB component. A connecting piece is provided at the other end of the input terminal. The upper cover and the lower cover are connected by bolts. After the upper cover and the lower cover are combined, the connecting piece extends into the EMC receiving slot and is electrically connected to the control circuit board. A connecting screw hole is provided at the end of the input terminal near the upper cover. The bolt passes through the upper cover and the connecting piece and is tightened into the connecting screw hole.

2. The EMC module mounting structure for a frequency converter according to claim 1, characterized in that: The control circuit board is provided with pin sockets. The end of the connecting piece away from the input terminal extends to the EMC receiving groove and passes through the pin socket. The connecting piece is fixedly connected to the control circuit board by soldering.

3. The EMC module mounting structure for a frequency converter according to claim 1, characterized in that: The EMC receiving groove is filled with sealant. After the control circuit board is placed in the EMC receiving groove and electrically connected to the connecting piece, the EMC component is fixed in the EMC receiving groove by sealing with sealant.

4. The EMC module mounting structure for a frequency converter according to claim 3, characterized in that: The encapsulant is used to immerse the control circuit board, while the common mode inductors and capacitors are only immersed in their pins, with their surfaces exposed to the air.

5. The EMC module mounting structure for a frequency converter according to any one of claims 1-4, characterized in that: The surface of the top cover is provided with a sealing hole, and bolts are passed through the sealing hole and tightened to the input terminal. A removable sealing cap is provided at the opening of the sealing hole.

6. The EMC module mounting structure for a frequency converter according to any one of claims 1-4, characterized in that: The PCB receiving groove is filled with sealant, which submerges the bottom of the PCB assembly.

7. The EMC module mounting structure for a frequency converter according to any one of claims 1-4, characterized in that: The sidewalls of the EMC receiving groove are provided with positioning buckles and support ribs. The positioning buckles and support ribs press against both sides of the control circuit board, so that the control circuit board is fixed in the EMC receiving groove.

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