CN210745831U - Heat radiation structure of vehicle-mounted high-side switch - Google Patents
Heat radiation structure of vehicle-mounted high-side switch Download PDFInfo
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- CN210745831U CN210745831U CN201921563549.6U CN201921563549U CN210745831U CN 210745831 U CN210745831 U CN 210745831U CN 201921563549 U CN201921563549 U CN 201921563549U CN 210745831 U CN210745831 U CN 210745831U
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Abstract
A heat dissipation structure of a vehicle-mounted high-side switch comprises a PCBA circuit board, a shell, a current input terminal assembly and a current output terminal assembly; the PCBA circuit board is arranged in the shell; the current input terminal assembly comprises an input conductive strip, the current output terminal assembly comprises an output conductive strip, and the bottom of the input conductive strip and the bottom of the output conductive strip are respectively connected with the PCBA circuit board in a welding manner; the shell is a heat dissipation shell made of heat conduction materials, and a first heat conduction groove and a second heat conduction groove which are downward opened are respectively formed in the inner wall of the heat dissipation shell; the upper part of the input conductive bar extends into the first heat conduction groove, at least one side surface of the input conductive bar is provided with a first heat conduction paste in an attaching mode, and the first heat conduction paste is attached to the side wall of the first heat conduction groove; the upper portion of output conducting strip stretches into second heat-conducting groove, and at least one side subsides of output conducting strip are equipped with the second heat conduction and paste, and the second heat conduction pastes and pastes the lateral wall that pastes the second heat-conducting groove. The utility model discloses a radiating effect is good, easily realizes.
Description
Technical Field
The utility model relates to an automotive electronics technique especially relates to the high limit switch of the power supply of the on-vehicle pre-heater of control.
Background
The vehicle-mounted high-side switch is mainly used for controlling the work of the vehicle-mounted preheater. The existing vehicle-mounted high-side switch mainly comprises a PCBA circuit board, a shell, a current input terminal assembly and a current output terminal assembly. The PCBA circuit board is arranged in the shell; the current input terminal assembly and the current output terminal assembly are respectively connected with the PCBA circuit board in a welding mode. The input current from the positive pole of the external power supply flows into the PCBA circuit board through the current input terminal assembly, and the current output by the PCBA circuit board flows to the negative pole of the external power supply through the current output terminal assembly, so that a loop is formed.
The current input terminal assembly, the current output terminal assembly and the power element (mainly MOS tube) on the PCBA circuit board of the current input terminal assembly can generate a large amount of heat during working, the existing vehicle-mounted high-side switch mainly depends on the natural air convection mode to realize heat dissipation, a special heat dissipation structure is lacked, the heat dissipation effect of the product is poor, and therefore the safety and the reliability of the product are affected.
In addition, the current input terminal assembly and the current output terminal assembly of the existing vehicle-mounted high-side switch transmit current through the threads of the bolts, and the connection mode can generate larger contact resistance.
Disclosure of Invention
The utility model aims to solve the technical problem that a heat radiation structure of on-vehicle high limit switch is provided, it enables on-vehicle high limit switch and obtains good radiating effect, and easily realizes.
The utility model aims to solve the technical problem that an on-vehicle high limit switch that current loss is little, the security is high is provided.
According to the utility model discloses a heat radiation structure of on-vehicle high limit switch of embodiment, including PCBA circuit board, shell, current input terminal subassembly and current output terminal subassembly; the PCBA circuit board is arranged in the shell; the current input terminal assembly comprises an input conductive strip, the current output terminal assembly comprises an output conductive strip, and the bottom of the input conductive strip and the bottom of the output conductive strip are respectively connected with the PCBA circuit board in a welding manner; the shell is a heat dissipation shell made of heat conduction materials, and a first heat conduction groove and a second heat conduction groove which are downward opened are respectively formed in the inner wall of the heat dissipation shell; the upper part of the input conductive bar extends into the first heat conduction groove, at least one side surface of the input conductive bar is provided with a first heat conduction paste in an attaching mode, and the first heat conduction paste is attached to the side wall of the first heat conduction groove; the upper portion of output conducting strip stretches into second heat-conducting groove, and at least one side subsides of output conducting strip are equipped with the second heat conduction and paste, and the second heat conduction pastes and pastes the lateral wall that pastes the second heat-conducting groove.
In the vehicle-mounted high-side switch, the current input terminal assembly comprises a first bolt, a first nut, a first gasket and a current input joint, the current input joint comprises a first top surface exposed outside the heat dissipation shell and a first side surface connected with the first top surface, and the first side surface is connected with one end of the input conductive strip; the first bolt penetrates through the first top surface from the interior of the heat dissipation shell, and the first nut is in threaded connection with the part of the first bolt extending out of the heat dissipation shell; the first gasket is sleeved outside the first bolt and positioned between the first nut and the first top surface; the current output terminal component comprises a second bolt, a second nut, a second gasket and a current output joint; the current output connector comprises a second top surface exposed outside the heat dissipation shell and a second side surface connected with the second top surface, and the second side surface is connected with one end of the output conductive strip; the second nut is in threaded connection with the part of the second bolt extending out of the heat dissipation shell; the second gasket is sleeved outside the second bolt and is positioned between the second nut and the second top surface.
The utility model discloses at least, have following advantage:
1. in the embodiment, the heat generated by the input conductive strips, the output conductive strips and the like is conducted to the heat dissipation shell, and the heat dissipation shell has a larger contact area with air, so that the heat dissipation speed is increased, and the heat dissipation efficiency is improved;
2. the current input connector and the current output connector of the vehicle-mounted high-side switch are respectively provided with a first top surface and a second top surface which are exposed outside the heat dissipation shell, the exposed first top surface and the exposed second top surface can be in direct contact with an external conductive nose, current flowing in from the conductive nose connected to the anode of an external power supply is directly conducted to the PCBA circuit board through the first top surface, the current output from the PCBA circuit board is directly conducted to the conductive nose connected with the cathode of the external power supply through the second top surface, and the bolts of the current input terminal assembly and the current output terminal assembly only play a role in fixing and locking, so that the generation of intermediate resistance is avoided, the current loss is reduced, the risks of product failure and complete machine burnout caused by excessive current are reduced, and the use safety of the product is improved.
Drawings
Fig. 1 is a schematic external view of an on-vehicle high-side switch according to an embodiment of the present invention.
Fig. 2 shows an explosion diagram of an on-board high-side switch according to an embodiment of the present invention.
Fig. 3 shows a schematic cross-sectional view of an on-board high-side switch according to an embodiment of the present invention.
Fig. 4 shows an assembly diagram of an input conductive strip, an output conductive strip, and a PCBA circuit board according to an embodiment of the invention.
Fig. 5 shows an exploded view of fig. 4.
Fig. 6 shows an assembly diagram of the current input terminal and the current output terminal with the first bolt and the second bolt, respectively, according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Please refer to fig. 1 to fig. 6. According to the utility model discloses an on-vehicle high limit switch, including PCBA circuit board 1, heat dissipation shell 2, current input terminal subassembly and current output terminal subassembly.
The heat dissipation housing 2 is made of a heat conductive material. In this embodiment, the thermally conductive material is aluminum. The upper surface of the heat dissipation housing 2 is provided with a plurality of heat dissipation fins 21 at intervals to increase the heat dissipation area of the heat dissipation housing.
The PCBA circuit board 1 is fixed in the heat dissipation case 2 by a plurality of locking screws 81, and sealed in the heat dissipation case 2 by a potting adhesive 82.
The current input terminal assembly includes a first bolt 31, a first nut 32, a first washer 34, a current input connector 33a and an input conductive strip 33 b. The current input terminal 33a includes a first top surface 331 and a first side surface 332 connected to the first top surface 331, and the first top surface 331 is exposed outside the heat dissipation case 2. The first side surface 332 is integrally connected to one end of the input conductive strip 33b, and a plurality of first soldering pins 333 are disposed at intervals at the bottom of the input conductive strip 33b, and the first soldering pins 333 are respectively soldered to the PCBA circuit board 1. The first bolt 31 passes through the first top surface 331 from inside the heat dissipation housing 2, and the first nut 32 is screwed with a portion of the first bolt 31 extending out of the heat dissipation housing 2. The first washer 34 is sleeved outside the first bolt 31 and located between the first nut 32 and the first top surface 331.
The current output terminal assembly includes a second bolt 41, a second nut 42, a second washer 44, a current output connector 43a and an output conductive bar 43 b. The current output terminal 43a includes a second top surface 431 and a second side surface 432 connected to the second top surface 431, and the second top surface 431 is exposed to the outside of the heat dissipation housing 2. The second side surface 432 is integrally connected to one end of the output conductive strip 43b, a plurality of second soldering pins 433 are disposed at intervals at the bottom of the output conductive strip 43b, and the second soldering pins 433 are respectively soldered to the PCBA circuit board 1. The second bolt 41 passes through the second top surface 431 from inside the heat dissipation housing 2, and the second nut 42 is screwed with the portion of the second bolt 41 extending out of the heat dissipation housing 2. The second washer 44 is sleeved outside the second bolt 41 and located between the second nut 42 and the second top surface 431.
In this embodiment, the current input connector 33a, the input conductive strip 33b, the current output connector 43a and the output conductive strip 43b are all made of copper. The first nut 32 and the second nut 42 are both flange nuts. The number of the first and second bonding pins 333 and 433 is four.
The inner wall of the heat dissipation casing 2 is provided with a first heat conduction groove 2a and a second heat conduction groove 2b which are opened downwards respectively. The upper part of the input conductive strip 33b extends into the first heat-conducting groove 2a, at least one side surface of the input conductive strip 33b is pasted with a first heat-conducting paste 71, and the first heat-conducting paste 71 is pasted to the side wall of the first heat-conducting groove 2 a; the upper portion of the output conductive strip 43b extends into the second heat conduction groove 2b, at least one side of the output conductive strip 43b is attached with a second heat conduction paste 72, and the second heat conduction paste 72 is attached to the side wall of the second heat conduction groove 2 b. The upper surface of each power element 14 on the PCBA circuit board 1 is attached with a third heat conducting paste 73, and the third heat conducting paste 73 is attached to the inner surface of the heat dissipation housing 2. A part of copper foil of the upper surface of the PCBA circuit board is pasted with a fourth heat conduction paste 74, and the fourth heat conduction paste 74 is pasted on the inner surface of the heat dissipation shell 2. The power element 14 is mainly referred to as a MOS transistor. Through with input busbar, output busbar, MOS pipe and copper foil surface etc. the heat conduction that produces to heat dissipation shell 2 on, utilize the characteristics that heat dissipation shell heat conductivity is good, have great area of contact with the air for the radiating rate has improved the radiating efficiency.
In the example shown in the figure, a first heat conduction paste 71 is pasted on both sides of the input conductive strip 33b, and a second heat conduction paste 72 is pasted on both sides of the output conductive strip 43 b. Optionally, the first heat conduction patch 71, the second heat conduction patch 72, the third heat conduction patch 73 and the fourth heat conduction patch 74 are all silica gel heat conduction patches. The first heat conduction paste 71, the second heat conduction paste 72, the third heat conduction paste 73 and the fourth heat conduction paste 74 are respectively pasted on the side surfaces of the input conductive strips, the side surfaces of the output conductive strips, the upper surfaces of the power elements and the copper foil on the upper surface of the PCBA circuit board through heat conduction glue. Wherein the first heat conduction paste 71 covers the entire side surface of the input conductive strip 33b, the second heat conduction paste 72 covers the entire side surface of the output conductive strip 43b, and the third heat conduction paste 73 covers the entire upper surface of the power element 14.
In the present embodiment, the heat dissipation housing 2 is provided with the through-holes 23 at positions corresponding to the first and second top surfaces 331 and 431, and the through-holes 23 expose both the first and second top surfaces 331 and 431. The vehicle-mounted high-side switch further comprises an insulating block 5, wherein the insulating block 5 is pressed on the heat dissipation shell 2 and detachably connected with the heat dissipation shell 2, and the detachable connection mode can be a buckling connection mode, a bolt connection mode and the like. The insulating block 5 is provided with a central through hole 53 at a position corresponding to the through hole 23 of the heat dissipation housing, and the central through hole 53 exposes both the first top surface 331 and the second top surface 431.
Further, the vehicle-mounted high-side switch of the present embodiment includes a control signal interface 6, and the control signal interface 6 includes a plastic housing 61 and a plurality of pins 62 disposed in the plastic housing.
When the vehicle-mounted high-side switch of the embodiment is connected to an external power supply, the first nut 32 and the second nut 42 are firstly loosened, then the first conductive nose (not shown in the figure) connected with the positive electrode of the vehicle-mounted power supply is sleeved outside the first bolt 31 and then fastened by the first nut 32, so that the first conductive nose is directly pressed on the first top surface 331, and the second conductive nose (not shown in the figure) connected with the negative electrode of the vehicle-mounted power supply is sleeved outside the second bolt 41 and fastened by the second nut 42, so that the second conductive nose is directly pressed on the second top surface 431. At this time, the current flowing in from the first conductive nose is directly conducted to the PCBA circuit board 1 through the first top surface 331, and the current output from the PCBA circuit board 1 is directly conducted to the second conductive nose through the second top surface 431, so that the generation of intermediate resistance is avoided, the current loss is reduced, the risks of product failure and complete machine burnout caused by excessive current are reduced, and the use safety of the product is improved.
In addition, the input conducting strip 33 and the output conducting strip 43 of the vehicle-mounted high-side switch of the embodiment are respectively connected with the PCBA circuit board 1 in a welding mode through a plurality of welding pins, so that the contact resistance between the input conducting strip and the PCBA circuit board 1 is reduced, the current loss is further reduced, and the use safety of products is improved.
In the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A heat dissipation structure of a vehicle-mounted high-side switch comprises a PCBA circuit board, a shell, a current input terminal assembly and a current output terminal assembly; the PCBA circuit board is disposed within the housing; the current input end subassembly comprises an input conductive strip, the current output end subassembly comprises an output conductive strip, and the bottoms of the input conductive strip and the output conductive strip are respectively connected with the PCBA circuit board in a welding manner; the heat dissipation device is characterized in that the shell is a heat dissipation shell made of heat conduction materials, and a first heat conduction groove and a second heat conduction groove which are downward opened are respectively formed in the inner wall of the heat dissipation shell; the upper part of the input conductive bar extends into the first heat conduction groove, at least one side surface of the input conductive bar is provided with a first heat conduction paste in an attaching mode, and the first heat conduction paste is attached to the side wall of the first heat conduction groove; the upper part of the output conducting strip extends into the second heat conducting groove, at least one side surface of the output conducting strip is provided with a second heat conducting paste in an attached mode, and the second heat conducting paste is attached to the side wall of the second heat conducting groove.
2. The heat dissipation structure of the on-vehicle high side switch of claim 1, wherein a third heat conduction paste is pasted on the upper surface of each power element on the PCBA circuit board, and the third heat conduction paste is pasted on the inner surface of the heat dissipation shell.
3. The heat dissipation structure of the on-vehicle high side switch of claim 2, wherein a portion of the copper foil of the upper surface of the PCBA circuit board is attached with a fourth heat conduction paste, and the fourth heat conduction paste is attached to the inner surface of the heat dissipation shell.
4. The heat dissipation structure of the on-vehicle high-side switch of claim 3, wherein the first heat conduction paste, the second heat conduction paste, the third heat conduction paste, and the fourth heat conduction paste are all silica gel heat conduction pastes.
5. The heat dissipation structure of the on-vehicle high-side switch of claim 3 or 4, wherein the first heat conduction paste, the second heat conduction paste, the third heat conduction paste and the fourth heat conduction paste are respectively adhered to the side surfaces of the input conductive strips, the side surfaces of the output conductive strips, the upper surfaces of the power elements and the copper foil on the upper surface of the PCBA circuit board through heat conduction adhesives.
6. The heat dissipation structure of the on-vehicle high-side switch according to claim 1, wherein a plurality of heat dissipation fins are provided at intervals on an upper surface of the heat dissipation housing.
7. The heat dissipation structure of the on-vehicle high side switch of claim 1, wherein the input conductive strip is provided with a plurality of first soldering pins spaced apart from each other, the output conductive strip is provided with a plurality of second soldering pins spaced apart from each other, and the plurality of first soldering pins and the plurality of second soldering pins are respectively soldered to the PCBA circuit board.
8. The heat dissipation structure of the on-vehicle high-side switch according to claim 1 or 7,
the current input terminal subassembly comprises a first bolt, a first nut, a first gasket and a current input joint, the current input joint comprises a first top surface exposed outside the heat dissipation shell and a first side surface connected with the first top surface, and the first side surface is connected with one end of the input conductive strip; the first bolt penetrates through the first top surface from the inside of the heat dissipation shell, and the first nut is in threaded connection with the part of the first bolt extending out of the heat dissipation shell; the first gasket is sleeved outside the first bolt and positioned between the first nut and the first top surface;
the current output terminal assembly comprises a second bolt, a second nut, a second gasket and a current output joint; the current output connector comprises a second top surface exposed outside the heat dissipation shell and a second side surface connected with the second top surface, and the second side surface is connected with one end of the output conductive strip; the second nut is in threaded connection with the part of the second bolt extending out of the heat dissipation shell; the second gasket is sleeved outside the second bolt and is positioned between the second nut and the second top surface.
9. The heat dissipation structure of a vehicle-mounted high side switch according to claim 1, wherein the heat dissipation housing is provided with through holes at positions corresponding to the first top surface and the second top surface to expose the first top surface and the second top surface.
10. The heat dissipation structure of the on-vehicle high-side switch according to claim 9, wherein the on-vehicle high-side switch comprises an insulating block, and the insulating block is pressed on the heat dissipation shell and detachably connected with the heat dissipation shell; the insulating block is provided with a central through hole at a position corresponding to the through hole of the heat dissipation shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921563549.6U CN210745831U (en) | 2019-09-19 | 2019-09-19 | Heat radiation structure of vehicle-mounted high-side switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921563549.6U CN210745831U (en) | 2019-09-19 | 2019-09-19 | Heat radiation structure of vehicle-mounted high-side switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210745831U true CN210745831U (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921563549.6U Active CN210745831U (en) | 2019-09-19 | 2019-09-19 | Heat radiation structure of vehicle-mounted high-side switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210745831U (en) |
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2019
- 2019-09-19 CN CN201921563549.6U patent/CN210745831U/en active Active
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