CN219203144U - Fixed fin based on plug-in MOSFET - Google Patents

Abstract

The utility model discloses a fixed radiating fin based on plug-in MOSFET (metal-oxide-semiconductor field effect transistor), which is characterized in that a cooling loop is arranged in a radiating fin body and can be communicated with a cooling loop of a vehicle-mounted charger shell, so that a cooling medium flows through the radiating fin body, the cooling efficiency of the radiating fin body is greatly enhanced, and an arc-shaped elastic sheet is adopted to fix the MOSFET, so that the MOSFET is fixed first and then welded, the mechanical stress generated by pins of the MOSFET is reduced, and the occurrence of the condition of welding pad breakage is reduced.

Description

Fixed fin based on plug-in MOSFET

Technical Field

The utility model belongs to the technical field of automobiles, relates to heat dissipation of a vehicle-mounted charger, and particularly relates to a fixed heat sink based on a plug-in MOSFET.

Background

In the prior art, a vehicle-mounted charger widely uses a MOSFET (metal-oxide semiconductor field effect transistor) as a power component; the common mode of fixing the MOSFET tube is to use a screw to pass through a through hole in the body to press and fix the MOSFET tube on the radiating fin, when the MOSFET tube is fastened, the MOSFET tube is welded on the circuit board, and because of assembly tolerance between the MOSFET tube and the radiating fin, certain deformation can be generated on the MOSFET tube pin in the fastening process, so that mechanical stress is generated on a bonding pad, and risks such as cracking exist on the bonding pad.

In addition, the power of the current vehicle-mounted battery charger is higher and higher, the power consumption of the MOSFET is higher and higher, and the heat dissipation requirement of the high-power MOSFET is difficult to meet only by virtue of the natural heat dissipation of the metal shell or the heat dissipation fin, so that the problem of the heat dissipation mode of the MOSFET is needed to be solved from the assembly mode of the MOSFET and the heat dissipation mode of the MOSFET.

Disclosure of Invention

Aiming at the problems, the utility model mainly aims to design a fixed radiating fin based on a plug-in MOSFET (metal oxide semiconductor field effect transistor) to solve the problems of mechanical stress of a pin bonding pad and radiating of a high-power MOSFET when the MOSFET is fixed in a vehicle-mounted battery charger product.

The utility model adopts the following technical scheme for realizing the purposes:

a fixed radiating fin based on plug-in MOSFET comprises a radiating fin body, wherein the MOSFET is arranged on the side surface of the radiating fin body;

a cooling channel is arranged in the cooling fin body, and a cooling medium flows through the cooling fin body through the cooling channel;

the side of fin body sets up the boss, and the MOSFET tube is fixed in the both sides of boss, and the pin of MOSFET tube upwards surpasss the fin body, and the pin welding of MOSFET tube is on the circuit board.

As a further description of the present utility model, the fin body includes a housing and a cover plate, the housing and the cover plate are sealed to form a flow channel cavity, the cooling channel is provided with an inlet and an outlet at the bottom of the housing, and a cooling circuit is formed in the flow channel cavity.

As a further description of the utility model, the cover plate is sealed at one side of the cooling channel, and the boss is arranged at the other side of the cooling channel.

As a further description of the utility model, the MOSFET tube is fixed on two sides of the boss through the elastic sheet and the fastening screw, the elastic sheet is provided with a long strip shape, and the fastening screw is positioned in the middle of the length of the elastic sheet.

As a further description of the utility model, the sections at the two ends of the spring plate comprise a half arc shape, the half arc shape corresponds to the position of the MOSFET tube, and the MOSFET tube is tightly propped.

As a further description of the utility model, the shell and the cover plate are made of aluminum alloy, and the cover plate and the shell are welded by friction welding.

As a further description of the utility model, the top of the housing is provided with a protruding threaded post.

Compared with the prior art, the utility model has the technical effects that:

the utility model provides a fixed radiating fin based on plug-in MOSFET (metal oxide semiconductor field effect transistor), wherein a cooling loop is arranged in a radiating fin body and can be communicated with a cooling loop of a vehicle-mounted charger shell, so that a cooling medium flows through the radiating fin body, the cooling efficiency of the radiating fin body is greatly enhanced, and an arc-shaped elastic sheet is adopted to fix the MOSFET, so that the MOSFET is fixed first and then welded, the mechanical stress generated by pins of the MOSFET is reduced, and the occurrence of the condition of welding pad breakage is reduced.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model (including a MOSFET);

FIG. 2 is a schematic view of cooling channels inside a fin body according to the present utility model;

FIG. 3 is a schematic diagram of the overall structure of the present utility model (excluding the MOSFET);

FIG. 4 is a cross-sectional view of the heat sink body of the present utility model assembled within a vehicle-mounted charger;

FIG. 5 is an assembled view of the heat sink body of the present utility model in a vehicle-mounted battery charger;

fig. 6 is an exploded view of the assembly of the fin body of the present utility model within a vehicle-mounted charger.

In the figure, the radiator comprises a radiator body, a shell, a cover plate, a boss, a threaded column, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) tube, a heat conduction insulating cap sleeve, a cooling channel, an inlet and an outlet, a sealing ring, a spring plate, a fastening screw, a vehicle-mounted charger, a liquid cooling channel and a circuit board.

Description of the embodiments

The utility model is described in detail below with reference to the attached drawing figures:

a fixed cooling fin based on plug-in MOSFET (metal oxide semiconductor field effect transistor) is shown with reference to figures 1-6 and comprises a cooling fin body 1, MOSFET (metal oxide semiconductor field effect transistor) tubes 2 are arranged on the side face of the cooling fin body 1, and the cooling fin body 1 is used for cooling the MOSFET tubes 2.

Specifically, the cooling channel 3 is disposed in the fin body 1, and the cooling medium flows through the fin body 1 through the cooling channel 3, so as to dissipate heat of the MOSFET tube 2. The cooling channel 3 is usually provided as a plurality of U-shaped continuous flow channels, the width of the whole flow channel is consistent, and the pressure drop of the flow channel is smaller under the condition of no abrupt change of the width dimension; and the side of the whole radiating fin main body 1 is uniformly distributed on the runner, so that the sufficient contact area between the cooling medium and the radiating fin main body 1 is ensured, the radiating efficiency is higher, and the radiating effect is better.

In this embodiment, the fin body 1 is set to include the form of casing 11 and apron 12, and casing 11 and apron 12 set to the aluminum alloy material, and simultaneously, casing 11 and apron 12 adopt friction stir welding's form to seal, form the runner cavity, cooling channel 3 set up exit 31 in the bottom of casing 11 to form cooling circuit in the runner cavity, greatly strengthened the cooling efficiency of fin body 1, avoided because of plug-in components MOSFET pipe 2 heat conduction interface is too far away from the cooling channel and appear poor heat dissipation problem.

In this embodiment, as shown in fig. 4-6, the housing of the vehicle-mounted charger 6 opens two liquid cooling channels 61 to be connected to the fluid medium inlet and outlet 31 formed at the bottom of the cooling fin body 1, so that the liquid cooling channels 61 of the housing of the vehicle-mounted charger 6 are communicated with the cooling channels 3 inside the cooling fin body 1, and the interface between the cooling fin body 1 and the housing of the vehicle-mounted charger 6 is sealed by a sealing ring 4, so that the heat generated by the high-power consumption MOSFET tube 2 is smoothly taken away by the cooling medium circulated by the housing of the vehicle-mounted charger 6.

It should be further noted that, in this embodiment, the side of the fin body 1 is provided with the boss 13, the MOSFET tube 2 is fixed on two sides of the boss 13, the pin of the MOSFET tube 2 upwardly exceeds the fin body 1, and the pin of the MOSFET tube 2 is welded on the circuit board, and the mode of assembling and welding the MOSFET tube 2 before the use is adopted, so as to avoid the mechanical stress caused by the post assembly of the bonding pad.

Specifically, apron 12 seal in one side of cooling channel, boss 13 set up the opposite side at cooling channel 3, MOSFET pipe 2 passes through shell fragment 5 and fastening screw 51 to be fixed in the both sides of boss 13, shell fragment 5 set up rectangular shape, fastening screw 51 is located shell fragment 5 length intermediate position, during the fastening, the MOSFET pipe 3 of guaranteeing the boss 13 both sides bear the consistent even of pressure of shell fragment 5, in addition, the both ends cross-section of shell fragment 5 includes half arc, half arc corresponds the position of MOSFET pipe 2, and the tight MOSFET pipe 2 of top.

In this embodiment, after the heat conduction insulating cap sleeve 21 is sleeved outside the plurality of MOSFET tubes 2, the heat conduction insulating cap sleeve is positioned by the jig, the heat dissipation plate body 1 is fixed on two sides of the boss 13 of the heat dissipation plate body 1 by using the elastic sheet 5, then the heat dissipation plate body 1 carrying the MOSFET tubes 2 is assembled with the circuit board 7, then the circuit board 7 passes through the furnace together with the heat dissipation plate body 1, the pins of the MOSFET tubes 2 are welded, and further the problem of cracking of the bonding pads caused by mechanical stress of bonding pads is avoided.

In this embodiment, the heat of the MOSFET tube 2 is transferred to the heat sink body 1 through the heat conducting insulating cap 21, and then the heat is carried away by the flow of the cooling medium therein.

In addition, in this embodiment, two threaded posts 14 are disposed at the top of the housing 11, the threaded posts 14 are higher than the top of the heat sink body 1, so as to avoid short circuit caused by direct contact between the top of the heat sink body 1 and the circuit board 7, and the threaded posts 14 are engaged with screw holes of the circuit board, so that the heat sink body 1 is fixed on the circuit board 7 by screws.

The comparative and prior art advantage analysis of this example is as follows:

1. a cooling loop is arranged in the radiating fin body 1 and can be communicated with a liquid cooling channel 61 of a liquid cooling shell of the vehicle-mounted charger 6, so that the radiating capability of the radiating fin is enhanced;

the MOSFET 2 is fixed on the radiating fin main body 1, and then the radiating fin main body 1 is fixed on the circuit board 7, so that mechanical stress on pins of the MOSFET 2 during welding and assembling is avoided;

3. the length of the radiating fin main body 1 can be properly adjusted, and the number of the bosses 13 for fixing the MOSFET tubes 2 at the back is increased, so that a plurality of MOSFET tubes 2 can be assembled on the radiating fin main body 1;

4. the form of the spring plate 5 for fixing the MOSFET tube 2 is in a strip shape, the fastening screw 51 is positioned at the middle position of the length of the spring plate 5, and when the fastening screw 51 presses the spring plate 5, the MOSFET tube 2 at two sides is ensured to bear the consistent and even spring plate pressure;

5. the radiating fin main body 1 can be used as a standard module and flexibly arranged at all positions of the vehicle-mounted charger shell.

The above embodiments are only for illustrating the technical solution of the present utility model, but not for limiting, and other modifications and equivalents thereof by those skilled in the art should be included in the scope of the claims of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (7)

1. Fixed fin based on plug-in components MOSFET pipe, its characterized in that: the Metal Oxide Semiconductor Field Effect Transistor (MOSFET) comprises a radiating fin body, wherein the MOSFET is arranged on the side surface of the radiating fin body;

a cooling channel is arranged in the cooling fin body, and a cooling medium flows through the cooling fin body through the cooling channel;

the side of fin body sets up the boss, and the MOSFET tube is fixed in the both sides of boss, and the pin of MOSFET tube upwards surpasss the fin body, and the pin welding of MOSFET tube is on the circuit board.

2. A plug-in MOSFET tube based fixed heat sink according to claim 1, wherein: the cooling fin body comprises a shell and a cover plate, the shell and the cover plate are sealed to form a flow channel cavity, the bottom of the shell is provided with an inlet and an outlet through the cooling channel, and a cooling loop is formed in the flow channel cavity.

3. A plug-in MOSFET tube based fixed heat sink according to claim 2, wherein: the cover plate is sealed on one side of the cooling channel, and the boss is arranged on the other side of the cooling channel.

4. A plug-in MOSFET tube based fixed heat sink according to claim 1, wherein: the MOSFET tube is fixed on the two sides of the boss through the elastic sheet and the fastening screw, the elastic sheet is provided with a long strip shape, and the fastening screw is positioned at the middle position of the length of the elastic sheet.

5. The plug-in MOSFET tube based stationary heat sink of claim 4, wherein: the sections at the two ends of the shrapnel comprise a half arc shape, the half arc shape corresponds to the position of the MOSFET, and the MOSFET is tightly propped.

6. A fixed heat sink based on plug-in MOSFET tubes according to claim 2 or 3, characterized in that: the shell and the cover plate are made of aluminum alloy, and the cover plate and the shell are welded through friction welding.

7. The plug-in MOSFET tube based stationary heat sink of claim 6, wherein: the top of the shell is provided with a protruding threaded column.

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