Frequency conversion controller of bidirectional locking circuit board

Abstract

The utility model relates to a frequency conversion controller of a bidirectional locking circuit board in the controller field, comprising a housing, a PCB assembly and an EMC assembly, the EMC assembly is electrically connected with the PCB assembly, the PCB assembly comprises a master control circuit board, a power tube, a capacitor and a bridge rectifier, the power tube, the capacitor and the bridge rectifier are all welded on the master control circuit board, a conductive terminal is arranged in the housing, and the conductive terminal is electrically connected with the EMC assembly. The shell and the conductive terminals are integrally formed through an insert injection molding process, pins of the conductive terminals extend to the outer side, the main control circuit board is fixedly connected with the pins through welding and locks the main control circuit board, a fixing frame is arranged at one end, close to the main control circuit board, of the shell, and the inner wall of the fixing frame can tightly press the edge of the main control circuit board. The main control circuit board is bidirectionally locked on the shell by the fixing frame and the pins, so that the mounting stability of the main control circuit board is improved, the main control circuit board is ensured not to fall off due to vibration in the use process, and the normal operation and the safety of the controller are ensured.

Description

Technical Field

[0001] This utility model relates to the field of controllers, and in particular to frequency converters with bidirectional locking circuit boards. 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 1-2 As shown, the structure of a commercially available power tool controller includes a PCB assembly 1, a switch 3, an EMC assembly 2, and a housing 4. The EMC assembly 2 is connected to the PCB assembly 1 via two input lines. The motor is connected to the PCB assembly 1 via three output lines. The switch 3 is connected to the PCB assembly 1 via a ribbon cable. The PCB assembly 1 is housed inside the housing 4. The PCB assembly includes a main control circuit board 5 and electronic components soldered to it.

[0004] In the existing structure, the main control circuit board is connected to the outer casing by bolts. During use, due to the rotation of the motor, the power tool and controller will often vibrate. Vibration can easily cause the bolts to loosen, causing the PCB components to fall off the casing. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides a frequency converter with a bidirectional locking circuit board, which can effectively solve the technical problem that the bolts connecting the main control circuit board and the housing are easy to loosen.

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

[0007] A frequency converter controller with a bidirectional locking circuit board includes a housing, a PCB assembly, and an EMC assembly. The EMC assembly is electrically connected to the PCB assembly. The PCB assembly includes a main control circuit board, power transistors, capacitors, and a bridge rectifier. The power transistors, capacitors, and bridge rectifier are all soldered onto the main control circuit board. Conductive terminals are provided inside the housing. The housing is integrally formed with the conductive terminals through an insert injection molding process. The pins of the conductive terminals extend to the outside of the housing. The main control circuit board is placed on the surface of the housing. The main control circuit board is fixedly connected to the pins by soldering and locked. A fixing frame is provided at one end of the housing near the main control circuit board. When the fixing frame is combined with the housing, the main control circuit board is located inside the fixing frame. The inner wall of the fixing frame can press the edge of the main control circuit board, so that the main control circuit board is subjected to pressure towards the housing and locked.

[0008] Furthermore, the inner wall of the fixing frame is provided with raised ribs, and when the fixing frame is combined with the outer shell, the bottom surface of the ribs presses against the edge of the main control circuit board.

[0009] Furthermore, the edge of the outer casing is provided with a mounting groove, and the end of the fixing bracket near the outer casing is provided with a plug-in part that can be paired and inserted into the mounting groove.

[0010] Furthermore, the surface of the outer casing is provided with a receiving groove, and a support block is provided in the receiving groove. When the main control circuit board is placed in the receiving groove, the top surface of the support block supports the bottom surface of the main control circuit board.

[0011] Furthermore, the receiving groove is provided with sealant, the inner wall of the fixing frame is flush with the side wall of the receiving groove, and the sealant is immersed in the main control circuit board up to the edge of the fixing frame away from the outer shell.

[0012] Furthermore, the housing is provided with an EMC receiving groove away from the PCB assembly, and the EMC assembly is disposed in the EMC receiving groove. The two ends of the conductive terminals extend to both sides of the housing, and the PCB assembly and the EMC assembly are connected through the conductive terminals inside the housing.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the outer shell is integrally formed with the conductive terminals through insert injection molding process, so that the conductive terminals are fixed in the outer shell. The main control circuit board is soldered to the pins of the conductive terminals, so that the main control circuit board is fixed on the surface of the outer shell. After the fixing frame is combined with the outer shell, the inner wall of the fixing frame can press the edge of the main control circuit board, pressing the main control circuit board to the surface of the outer shell. The main control circuit board is bidirectionally locked to the outer shell by the fixing frame and the pins, which improves the installation stability of the main control circuit board and ensures that the main control circuit board will not fall off due to vibration during use, thereby ensuring the normal operation and safety of the controller. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the existing technology;

[0015] Figure 2 This is a schematic diagram of the structure of a PCB assembly in the prior art;

[0016] Figures 1-2 Numbers: 1-PCB assembly, 2-EMC assembly, 3-switch, 4-housing, 5-main control circuit board.

[0017] Figure 3 This is a front perspective view of the present invention;

[0018] Figure 4 This is a bottom-view perspective view of the present invention;

[0019] Figure 5This is an exploded view of the structure of this utility model;

[0020] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0021] Figure 7 for Figure 5 A magnified view of a section at point B in the middle;

[0022] Figures 3-7 Number of components: 1-Outer shell, 101-Mounting slot, 102-Receiving slot, 103-Support block, 2-PCB assembly, 201-Main control circuit board, 202-Capacitor, 203-Heat sink, 204-Bridge rectifier, 3-EMC assembly, 4-Conductive terminal, 5-Fixing bracket, 501-Pressure rib, 502-Plug-in part, 6-Sealing adhesive. Detailed Implementation

[0023] 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.

[0024] The following is combined Figures 3-7 The frequency converter controller of the bidirectional locking circuit board of this utility model is described in detail as follows:

[0025] The frequency converter controller with a bidirectional locking circuit board 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. The PCB assembly 2 includes a main control circuit board 201, power transistors, capacitors 202, a heat sink 203, and a bridge rectifier 204. The power transistors, capacitors 202, and bridge rectifier 204 are all soldered onto the main control circuit board 201. The heat sink 203 is attached to the surface of the power transistors. Conductive terminals 4 are provided inside the housing 1. The housing 1 is integrally formed with the conductive terminals 4 through an insert injection molding process. The leads of the conductive terminals 4 extend to the outside of the housing 1. The main control circuit board 201 is placed on... On the surface of the outer casing 1, the main control circuit board 201 is fixedly connected to the pins by soldering and locked. A fixing frame 5 is provided at one end of the outer casing 1 near the main control circuit board 201. When the fixing frame 5 is combined with the outer casing 1, the main control circuit board 201 is located inside the fixing frame 5. The inner wall of the fixing frame 5 can press the edge of the main control circuit board 201, so that the main control circuit board 201 is subjected to pressure in the direction of the outer casing 1 and locked. The inner wall of the fixing frame 5 is provided with a protruding pressure rib 501. When the fixing frame 5 is combined with the outer casing 1, the bottom surface of the pressure rib 501 presses the edge of the main control circuit board 201.

[0026] The edge of the outer shell 1 is provided with a mounting groove 101. The end of the fixing frame 5 near the outer shell 1 is provided with a plug part 502 that can be inserted into the mounting groove 101. Glue can be applied to the plug part 502 or the mounting groove 101 to fix the fixing frame 5 and the outer shell 1 together. This makes the installation of the fixing frame 5 more convenient and quick, and also improves the production efficiency of the controller.

[0027] The outer casing 1 has a receiving groove 102 on its surface, and a support block 103 is provided inside the receiving groove 102. When the main control circuit board 201 is placed in the receiving groove 102, the top surface of the support block 103 supports the bottom surface of the main control circuit board 201. A sealant 6 is provided in the receiving groove 102. The inner wall of the fixing bracket 5 is flush with the side wall of the receiving groove 102. The sealant 6 submerges the main control circuit board 201 up to the edge of the fixing bracket 5 furthest from the outer casing 1. Through the submersion of the sealant 6, the main control circuit board 201 is further fixed and its shock resistance is enhanced. Simultaneously, the use of the sealant 6 also provides moisture and dust protection, extending the service life of the controller.

[0028] The outer casing 1 is provided with an EMC receiving groove 102 away from the PCB assembly 2. The EMC assembly 3 is provided in the EMC receiving groove 102. The two ends of the conductive terminals 4 extend to the two sides of the outer casing 1 respectively. The PCB assembly 2 and the EMC assembly 3 are connected through the conductive terminals 4 in the outer casing 1. The EMC assembly 3 includes a control circuit board, a common mode inductor and a capacitor 202. The common mode inductor and the capacitor 202 are soldered on the control circuit board. The functions and working principles of the PCB assembly 2 and the EMC assembly 3 are common knowledge and conventional technical means in the field. Those skilled in the art know or can easily obtain relevant information, so they will not be described again.

[0029] In this embodiment, the inverter controller with bidirectional locking circuit board has a housing 1 integrally formed with conductive terminals 4 through insert injection molding, so that conductive terminals 4 are fixed in the housing 1. The main control circuit board 201 is soldered to the pins of conductive terminals 4, so that the main control circuit board 201 is fixed to the surface of the housing 1. After the fixing frame 5 is combined with the housing 1, the pressure ribs 501 on the inner wall of the fixing frame 5 can press the edge of the main control circuit board 201, pressing the main control circuit board 201 to the surface of the housing 1. The main control circuit board 201 is bidirectionally locked to the housing 1 by the fixing frame 5 and the pins, which improves the installation stability of the main control circuit board 201 and ensures that the main control circuit board 201 will not fall off due to vibration during use, thereby ensuring the normal operation and safety of the controller.

[0030] 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. A frequency converter with a bidirectional locking circuit board, comprising a housing, a PCB assembly, and an EMC assembly, wherein the EMC assembly is electrically connected to the PCB assembly, characterized in that: The PCB assembly includes a main control circuit board, power transistors, capacitors, and a bridge rectifier. The power transistors, capacitors, and bridge rectifier are all soldered onto the main control circuit board. Conductive terminals are provided inside the housing. The housing is integrally formed with the conductive terminals through an insert injection molding process. The leads of the conductive terminals extend to the outside of the housing. The main control circuit board is placed on the surface of the housing. The main control circuit board is fixedly connected to the leads by soldering and locked. A fixing frame is provided at one end of the housing near the main control circuit board. When the fixing frame is combined with the housing, the main control circuit board is located inside the fixing frame. The inner wall of the fixing frame can press the edge of the main control circuit board, so that the main control circuit board is subjected to pressure towards the housing and locked.

2. The frequency converter of the bidirectional locking circuit board according to claim 1, characterized in that: The inner wall of the fixing frame is provided with raised pressure ribs. When the fixing frame is combined with the outer shell, the bottom surface of the pressure ribs presses against the edge of the main control circuit board.

3. The frequency converter of the bidirectional locking circuit board according to claim 1, characterized in that: The edge of the outer shell is provided with a mounting groove, and the end of the fixing bracket near the outer shell is provided with a plug-in part that can be paired and inserted into the mounting groove.

4. The frequency converter of the bidirectional locking circuit board according to any one of claims 1-3, characterized in that: The surface of the outer casing is provided with a receiving groove, and a support block is provided in the receiving groove. When the main control circuit board is placed in the receiving groove, the top surface of the support block supports the bottom surface of the main control circuit board.

5. The frequency converter of the bidirectional locking circuit board according to claim 4, characterized in that: The receiving groove is filled with sealant, the inner wall of the fixing frame is flush with the side wall of the receiving groove, and the sealant is submerged in the main control circuit board up to the edge of the fixing frame away from the outer shell.

6. The frequency converter of the bidirectional locking circuit board according to any one of claims 1-3, characterized in that: The housing is provided with an EMC receiving groove away from the PCB assembly. The EMC assembly is located in the EMC receiving groove. The two ends of the conductive terminals extend to both sides of the housing. The PCB assembly and the EMC assembly are connected through the conductive terminals inside the housing.

Images