CN211352587U

CN211352587U - MOS (metal oxide semiconductor) tube mounting structure applied to electric tool switch

Info

Publication number: CN211352587U
Application number: CN201921803147.9U
Authority: CN
Inventors: 焦新忠
Original assignee: Suzhou Huazhijie Telecom Co ltd
Current assignee: Suzhou Huazhijie Telecom Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-08-25
Anticipated expiration: 2029-10-25

Abstract

The utility model relates to a MOS pipe mounting structure for electric tool switch, including switch casing, PCB board, MOS pipe, the casing includes the base, upper cover and lower cover, form the installation cavity of installation PCB board between lower cover and the base, the base is provided with the constant head tank of scarf joint MOS pipe towards the one side of upper cover, the G pin of MOS pipe passes the base and connects directly on PCB board, be provided with D conductor and S conductor in the base, the one end of D conductor passes the base and is connected with PCB board, the other end inserts in the constant head tank and welds with the root of D pin; one end of the S conductor penetrates through the base to be connected with the PCB, the other end of the S conductor is inserted into the positioning groove to be welded with the root of the S pin, a welding window used for welding the D pin and the S pin is arranged on the upper cover, and the welding window is sealed by a sealing plate. The mounting structure can effectively reduce the heat productivity of the MOS tube and effectively avoid stress generated by each pin in the mounting process of the MOS tube.

Description

MOS (metal oxide semiconductor) tube mounting structure applied to electric tool switch

The technical field is as follows:

the utility model relates to a be applied to MOS pipe mounting structure of electric tool switch.

Background art:

the MOS tube is an electronic component commonly used in a switch of an electric tool, is provided with a plurality of long and thin pins and is electrically connected with a PCB (printed circuit board) through the pins, and the long and thin pins of the MOS tube have high resistance, so that when current flows through the pins of the MOS tube, particularly the pins D and S, the heat productivity is high, the working temperature of the MOS tube is high, and the service life of the MOS tube is shortened.

Meanwhile, the MOS tube is directly connected to the PCB, and there is no isolation between the MOS tube and the PCB, and the high-temperature MOS tube may cause the temperature of the PCB to rise, which affects the normal operation of other electronic components on the PCB, so that it is necessary to provide an MOS tube mounting structure that can not only reduce the heat generation of the MOS tube, but also effectively protect the PCB from high temperature.

The utility model has the following contents:

the utility model discloses the technical problem that will solve is: the utility model provides a be applied to MOS pipe mounting structure of electric tool switch, this structure can reduce MOS pipe calorific capacity, can effectively protect the PCB board again and avoid high temperature to influence, can avoid MOS pipe to produce stress or warp at the switch assembly in-process moreover to ensure that the performance of MOS pipe keeps in the optimum, improve MOS pipe result of use, extension MOS pipe life.

In order to solve the technical problem, the utility model discloses a technical scheme is: the MOS tube mounting structure applied to the electric tool switch comprises a switch shell, a PCB board arranged in the shell and an MOS tube electrically connected with the PCB board, the shell comprises a base, an upper cover covering one side of the base and a lower cover covering the other side of the base, a mounting cavity is formed between the lower cover and the base, the PCB is fixedly clamped in the mounting cavity, a positioning groove for accommodating the MOS tube is arranged on one surface of the base facing the upper cover, the MOS tube is embedded in the positioning groove, one surface of the upper cover facing the base is abutted against the MOS tube to fix the MOS tube, the MOS tube is used for transmitting a G pin of a signal current to pass through the base to be directly plugged on the PCB and welded with the PCB, the base is internally provided with a D conductor and an S conductor which are in one-to-one correspondence with the D pins and the S pins of the MOS tube, one end of the D conductor penetrates through the base to be fixedly welded with a corresponding contact on the PCB, and the other end of the D conductor is inserted into the positioning groove to be welded with the root of the D pin; one end of the S conductor penetrates through the base and is fixedly welded with a corresponding contact on the PCB, the other end of the S conductor is inserted into the positioning groove and is welded with the root of the S pin, a welding window opposite to the D pin and the S pin is arranged on the upper cover, the welding window is sealed by a sealing plate, and the sealing plate is fixedly connected to the upper cover.

As a preferred scheme, the upper cover, the MOS tube and the base are connected with each other through a bolt, a counter bore is formed in one surface of the base, which faces away from the upper cover, a nut is arranged in the counter bore, and the bolt sequentially penetrates through the upper cover, a positioning hole of the MOS tube and the base from the outer side of the upper cover to be inserted into the counter bore and is in threaded connection with the nut.

As a preferred scheme, the upper cover includes the lid body of being connected with the base and connects at the fin that the lid body is back to base one side, set up on the lid body with the dead right louvre of MOS pipe, the fin covers on the louvre, and the MOS pipe passes the louvre and pastes the joint with the fin, the welding window is seted up on the fin, the shrouding is connected in the fin one side back to the MOS pipe, the bolt passes the locating hole of fin, lid body, MOS pipe in proper order, the base inserts in the counter bore with nut threaded connection.

As a preferred scheme, the number of the MOS transistors is two, the D pins of the two MOS transistors are connected in parallel to the D conductor, and the S pins of the two MOS transistors are connected in parallel to the S conductor.

The utility model has the advantages that: the root of the pin D and the PCB are connected through the conductor D, and the root of the pin S and the PCB are connected through the conductor S, so that the length of current flowing through the pin D and the pin S is shortened, the heat productivity is reduced, the working temperature of the MOS tube is reduced, and the service life of the MOS tube is prolonged; meanwhile, the utility model separates the MOS tube and the PCB board on the two sides of the base, thereby effectively avoiding the electronic element on the PCB board from being influenced by the high temperature MOS tube and ensuring the normal work of the electronic element on the PCB board; in addition, set up the welding window on the casing for the MOS pipe can weld after the upper cover is accomplished to the installation, because the upper cover has been installed, the position of MOS pipe in the switch has been fixed, welds through the welding window at this moment, can not make MOS pipe pin produce stress or deformation again, thereby ensures that the performance of MOS pipe keeps in the optimum, improves MOS pipe result of use, extension MOS pipe life.

Description of the drawings:

the following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic diagram of the external structure of a switch adopting the mounting structure of the present invention;

fig. 3 is an exploded view of the present invention;

fig. 4 is a schematic view of a connection structure of the MOS transistor, the D conductor, and the S conductor.

In fig. 1 to 4: 1. the PCB comprises a shell, 101, a base, 102, an upper cover, 1021, a cover body, 1022, a radiating fin, 103, a lower cover, 2, a PCB board, 3, an MOS tube, 301, a positioning hole, 302, a G pin, 303, a D pin, 304, an S pin, 4, a mounting cavity, 5, a welding window, 6, a sealing plate, 7, a positioning groove, 8, a D conductor, 9, a bolt, 10, a counter bore, 11, a nut, 12, a radiating hole, 13 and an S conductor.

The specific implementation mode is as follows:

the following describes in detail a specific embodiment of the present invention with reference to the drawings.

As shown in fig. 1 to 4, the MOS tube mounting structure applied to a switch of an electric tool includes a switch housing 1, a PCB 2 mounted in the housing 1, and a MOS tube 3 electrically connected to the PCB 2, wherein the housing 1 includes a base 101, an upper cover 102 covering one side of the base 101, and a lower cover 103 covering the other side of the base 101, a mounting cavity 4 is formed between the lower cover 103 and the base 101, the PCB 2 is fixedly clamped in the mounting cavity 4, a positioning groove 7 for accommodating the MOS tube 3 is disposed on one side of the base 101 facing the upper cover 102, the MOS tube 3 is embedded in the positioning groove 7, one side of the upper cover 102 facing the base 101 abuts against the MOS tube 3 to fix the MOS tube 3, a G pin 302 of the MOS tube 3 for transmitting a signal current passes through the base 101 to be directly inserted into the PCB 2 and welded to the PCB 2, D conductors 8 and S conductors 13 corresponding to D pins 303 and S pins 304 of the MOS tube 3 one to one are disposed in the base 101, one end of the D conductor 8 penetrates through the base 101 to be fixedly welded with a corresponding contact on the PCB 2, and the other end of the D conductor is inserted into the positioning groove 7 to be welded with the root of the D pin 303; one end of the S conductor 13 penetrates through the base 101 to be fixedly welded with a corresponding contact on the PCB 2, the other end of the S conductor is inserted into the positioning groove 7 to be welded with the root of the S pin 304, the upper cover 102 is provided with a welding window 5 opposite to the D pin 303 and the S pin 304, the welding window 5 is sealed by a seal plate 6, and the seal plate 6 is fixedly connected to the upper cover 102.

In the embodiment, the root of the pin D303 is connected with the PCB 2 through the conductor D8, and the root of the pin S304 is connected with the PCB 2 through the conductor S13, so that the length of current flowing through the pin D303 and the pin S304 is shortened, the heat productivity is reduced, the working temperature of the MOS transistor 3 is reduced, and the service life of the MOS transistor 3 is prolonged; meanwhile, in the embodiment, the MOS tube 3 and the PCB 2 are respectively arranged on two sides of the base 101, so that the MOS tube 3 is isolated from the PCB 2, thereby effectively preventing the electronic components on the PCB 2 from being affected by the high-temperature MOS tube 3, and ensuring the normal operation of the electronic components on the PCB 2; in addition, set up welding window 5 on casing 1 for MOS pipe 3 can weld after upper cover 102 installation is accomplished, the position of MOS pipe 3 in the switch has already been fixed after upper cover 102 installation is accomplished, weld through welding window 5 again at this time, D pin 303 and S pin 304 that can no longer make MOS pipe 3 produce stress or deformation, thereby ensure that MOS pipe 3' S performance keeps in the optimum state, improve MOS pipe 3 result of use, extension MOS pipe 3 life, the G pin of MOS pipe can be welded on PCB board one side, cover upper and lower cover 103 after the welding again, lower cover 103 can not touch MOS pipe 3, consequently can not arouse the deformation of MOS pipe 3, the MOS pipe still can keep good user state.

In this embodiment, the upper cover 102 includes a cover body 1021 connected with the base 101, and a heat sink 1022 connected to a side of the cover body 1021 opposite to the base 101, the cover body 1021 is provided with a heat sink 12 opposite to the MOS transistor 3, the heat sink 1022 covers the heat sink 12, the MOS transistor 3 passes through the heat sink 12 and is attached to the heat sink 1022 to improve a heat dissipation effect, the welding window 5 is opened on the heat sink 1022, the sealing plate 6 is connected to a side of the heat sink 1022 opposite to the MOS transistor 3, the upper cover 102, the MOS transistor 3, and the base 101 are connected to each other through a bolt 9, a counterbore 10 is provided on a side of the base 101 opposite to the upper cover 102, a nut 11 is provided in the counterbore 10, and the bolt 9 sequentially passes through the heat sink 1022, the cover body 1021, a positioning hole 301 of the MOS transistor 3, and the base 101 and is inserted into the.

As shown in fig. 4, the number of the MOS transistors 3 is two, the D pins of the two MOS transistors 3 are connected in parallel to the D conductor 8, and the S pins of the two MOS transistors 3 are connected in parallel to the S conductor 8.

The utility model discloses a working process is: as shown in fig. 1 and 3, the PCB 2 is first mounted on the side of the base 101 facing the lower cover 103, in this embodiment, the PCB 2 is embedded on the base 101, then the D conductor 8 and the S conductor 13 are mounted on the base 101, the lower ends of the D conductor 8 and the S conductor 13 are respectively abutted against the corresponding contacts on the PCB 2 or passed through the corresponding insertion holes on the PCB 2, then the MOS tube 3 is mounted in the positioning groove 7 on the side of the base 101 facing the upper cover 103, the G pin of the MOS tube 3 is passed through the base 101 and movably inserted into the corresponding insertion holes on the PCB 2, then the cover body 1021 and the heat sink 1022 are sequentially covered, the heat sink 1022, the cover body 1021, the MOS tube 3 and the base 101 are firmly connected by the bolt 9, the MOS tube 3 is stably fixed by the cover body 1021 and the base 101, then the D pin 303 of the MOS tube 3 is welded with the D conductor 8 through the welding window 5 on the heat sink 1022, the S pin 304 of the MOS tube 3 and the S conductor 13 are soldered, and finally the cover plate 6 is fixedly attached to the heat sink 1022 to close the solder window 5.

Then, the G pin 302, the D conductor 8, and the S conductor 13 are respectively welded to the PCB 2 from the PCB 2 side, and the lower cover 103 is closed, thereby completing the mounting of the MOS transistor 3.

The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.

Claims

1. Be applied to MOS pipe mounting structure of electric tool switch, including switch housing (1), install PCB board (2) in casing (1) and with PCB board (2) electric connection's MOS pipe (3), its characterized in that, casing (1) includes base (101), upper cover (102) and lower cover (103) that the lid closed at base (101) one side close at base (101) opposite side of lid, form installation cavity (4) between lower cover (103) and base (101), PCB board (2) fixed joint is in installation cavity (4), base (101) one side towards upper cover (102) is provided with constant head tank (7) that are used for holding MOS pipe (3), MOS pipe (3) scarf joint is in constant head tank (7), and upper cover (102) make MOS pipe (3) fixed towards one side butt of base (101) on MOS pipe (3), G pin (302) that MOS pipe (3) are used for carrying signal current directly pass base (2) The base (101) is internally provided with a D conductor (8) and an S conductor (13) which are in one-to-one correspondence with the D pins (303) and the S pins (304) of the MOS tube (3), one end of the D conductor (8) penetrates through the base (101) to be fixedly welded with corresponding contacts on the PCB (2), and the other end of the D conductor is inserted into the positioning groove (7) to be welded with the root of the D pin (303); one end of the S conductor (13) penetrates through the base (101) to be fixedly welded with a corresponding contact on the PCB (2), the other end of the S conductor is inserted into the positioning groove (7) to be welded with the root of the S pin (304), a welding window (5) opposite to the D pin (303) and the S pin (304) is formed in the upper cover (102), the welding window (5) is sealed by a sealing plate (6), and the sealing plate (6) is fixedly connected onto the upper cover (102).

2. The MOS tube mounting structure applied to the switch of the electric tool as claimed in claim 1, wherein the upper cover (102), the MOS tube (3) and the base (101) are connected with each other through a bolt (9), a counter bore (10) is formed in one side of the base (101) opposite to the upper cover (102), a nut (11) is arranged in the counter bore (10), and the bolt (9) sequentially penetrates through the upper cover (102), a positioning hole (301) of the MOS tube (3) and the base (101) from the outer side of the upper cover (102) to be inserted into the counter bore (10) to be in threaded connection with the nut (11).

3. The MOS transistor mounting structure for switch of electric tool as claimed in claim 2, characterized in that the upper cover (102) comprises a cover body (1021) connected with the base (101) and a radiating fin (1022) connected with one side of the cover body (1021) back to the base (101), the cover body (1021) is provided with a heat dissipation hole (12) which is opposite to the MOS tube (3), the radiating fins (1022) cover the radiating holes (12), the MOS tube (3) passes through the radiating holes (12) to be attached to the radiating fins (1022), the welding window (5) is arranged on the radiating fin (1022), the sealing plate (6) is connected to one side of the radiating fin (1022) opposite to the MOS tube (3), the bolt (9) penetrates through the radiating fin (1022), the cover body (1021), the positioning hole (301) of the MOS tube (3) and the base (101) in sequence and is inserted into the counter bore (10) to be in threaded connection with the nut (11).

4. The MOS tube mounting structure applied to the power tool switch is characterized in that the number of the MOS tubes (3) is two, the D pins of the two MOS tubes (3) are connected in parallel on the D conductor (8), and the S pins of the two MOS tubes (3) are connected in parallel on the S conductor (13).