Power assembly with stably connected pins and converter

Abstract

The utility model discloses a power assembly with stably connected pins and a converter, and the power assembly comprises a circuit board which is provided with a first board surface at a first side in a first direction; the radiator is fixedly connected with the circuit board, is positioned on the first side of the first direction of the circuit board, and is provided with a radiating surface facing the circuit board; a plurality of switch tubes, each of which is located at the first side of the circuit board in the first direction and is connected with the circuit board through a pin; the first side of each pressing sheet in the first direction is provided with an embedding groove of which the notch faces the radiator; the switch tubes are embedded and fixed in the embedding grooves in a one-to-one correspondence manner, and the first tube surfaces of the first sides, facing the first direction, of the switch tubes are exposed out of the embedding grooves; the pressing piece is fixedly connected to the radiator and located on the second side of the radiator in the first direction. The first pipe face makes contact with the radiating face for heat conduction. The power assembly can improve the stability of the connection between the pins of the switch tube and the circuit board during vibration.

Description

Technical Field

[0001] The utility model relates to the technical field of power components and converters, and in particular to a power component and converter with high structural strength. Background Art

[0002] Converters are widely used in power systems, rail transit, military industry, petroleum machinery, new energy vehicles, wind power generation, solar photovoltaic and other fields. They can realize unidirectional or bidirectional conversion of electric energy and have rectification and inversion functions. Among them, NPC (Neutral Point Clamp) type or ANPC (Active Neutral Point Clamp) type three-level topology can use low blocking voltage IGBT devices to increase the DC bus voltage, thereby increasing the AC output voltage and expanding the system power level, so it has been widely used in converters.

[0003] The main component of the converter is the power assembly, which mainly includes a capacitor busbar and several switching tubes. The pins of these switching tubes need to be soldered to the circuit board. When the number of switching tubes is large, the excessive number of pins will cause the structural strength of the circuit board to decrease. When vibration occurs, cracks will appear in the connection between the pins of the switching tubes and the circuit board. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology and to provide a power component and a converter with stable pin connection, which can improve the stability of the connection between the pin of the switch tube and the circuit board during vibration.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Technical solution 1: A power component with stable pin connection, comprising: a circuit board, a first board surface is provided on a first side in a first direction of the circuit board; a heat sink, which is fixed to the circuit board and located on the first side in the first direction of the circuit board, and a heat dissipation surface is provided facing the circuit board; a plurality of switch tubes, each of which is located on the first side in the first direction of the circuit board and connected to the circuit board through pins; and a plurality of pressing sheets, each of which is provided with an embedding groove with a notch facing the heat sink on the first side in the first direction; the switch tubes are embedded and fixed to the embedding grooves one by one, and their first tube surfaces facing the first side in the first direction are exposed from the embedding grooves; the pressing sheet is fixed to the heat sink and located on the second side in the first direction of the heat sink, and the first tube surface is in contact with the heat dissipation surface for heat conduction.

[0007] Technical solution 2 based on technical solution 1: also includes a plurality of fasteners, which are locked toward the first side of the first direction to fix the pressing sheet to the heat sink, and make the first tube surface of the switch tube located in the pressing sheet close to the heat dissipation surface.

[0008] Technical solution three based on technical solution two: the inner surface of the groove wall of the embedding groove is provided with a clamping rib, and after the switch tube is embedded in the embedding groove, it is fixed with the clamping rib through friction fit.

[0009] Technical solution four based on technical solution three: a pair of elastic clamps with opposite clamping directions are provided on the second side of the first direction of the pressing sheet; a second board surface is provided on the second side of the first direction of the circuit board, and clamping holes passing through the first board surface and the second board surface are provided; the same pair of elastic clamps are passed through the corresponding clamping holes, and are clamped with the edge of the clamping holes located on the second board surface.

[0010] Technical solution five based on technical solution four: the pressing sheet is provided with a plug-in column between the same pair of elastic clamps; the edge of the clamping hole is provided with a first limiting portion and a second limiting portion, the first limiting portion is suitable for the insertion of the plug-in column and limits the movement of the plug-in column in other directions perpendicular to the first direction, the second limiting portion is clamped together with the elastic clamp and limits the movement of the elastic clamp in other directions that are perpendicular to the first direction and its clamping direction.

[0011] Technical solution six based on technical solution five: the pressing plate includes at least two embedding grooves; each of the embedding grooves on the pressing plate is arranged along a second direction perpendicular to the first direction, and a screw hole penetrating the pressing plate along the first direction is provided between two adjacent embedding grooves along the second direction, and the fastener passes through the screw hole from the second board surface of the circuit board to lock the pressing plate to the heat sink.

[0012] Technical solution seven based on technical solution six: the tube body of the switch tube is embedded and fixed in the embedding groove, and its pin extends from the tube body perpendicular to the first direction and bends toward the circuit board to be connected to the circuit board; a notch is provided on the groove side of the embedding groove for the pin to extend out.

[0013] Technical solution eight based on technical solution seven: the pressing sheet is provided with an abutment protrusion at the bottom of each of the embedding grooves, and the abutment protrusion abuts against the second tube surface of the switch tube embedded in the embedding groove on the second side of the first direction.

[0014] Technical solution nine based on technical solution eight: also includes a ceramic heat-conducting plate; the heat dissipation surface is provided with a receiving groove corresponding to each pressing plate depression; one side surface of the ceramic heat-conducting plate is tightly attached to the bottom of the receiving groove, and the other side surface is flush with the edge of the groove of the receiving groove and tightly attached to the first tube surface.

[0015] In addition, the utility model also provides technical solution ten: a converter, which includes a shell, and a power component with a stable pin connection is installed in the shell.

[0016] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0017] Technical solution one provides a power component with stable pin connection. The circuit board in the power component is fixed to the heat sink. At the same time, the switch tube connected to the circuit board through the pin is fixed to the heat sink through a pressing plate. When the power component vibrates due to external influences, the circuit board, the heat sink and the switch tube are connected as one. Therefore, the switch tube will not change its position relative to the circuit board, and the connection between the pin of the switch tube and the circuit board is more stable.

[0018] Specifically, the heat sink is fixed directly or indirectly to the circuit board, and a pressing sheet is provided at the same time. An embedding groove is provided on the pressing sheet. Each switch tube can be embedded and fixed in the embedding groove. The groove wall of the embedding groove will limit the movement of the switch tube in the lateral position of the embedding groove, so that the switch tube and the pressing sheet form a tightly connected whole through the fixed cooperation between the embedding groove and the switch tube; then, the pressing sheet is directly or indirectly fixed to the heat sink. Compared with the switch tube, the pressing sheet can withstand a greater locking force and can be fixed to the heat sink in more ways. Therefore, when the pressing sheet is fixed to the heat sink, it has better connection stability than directly fixing the switch tube to the heat sink; at the same time, the notch of the embedding groove can also expose the first tube surface of the switch tube. When the pressing sheet is fixed to the heat sink, the first tube surface can contact and conduct heat with the heat dissipation surface of the heat sink. Therefore, through the pressing sheet, not only the fixing problem of the switch tube can be solved, but also the heat dissipation problem of the switch tube can be solved simultaneously. Among them, the pressing sheet should be made of insulating material, which can avoid heat transfer between the power tube and the circuit board and improve the safety problem of the power tube.

[0019] In technical solution two, a fastener is provided, and the fastener locks the pressing plate to the heat sink on the first side facing the first direction. During the locking process of the fastener, the fastener applies a compressive force toward the heat sink to the pressing plate, and the compressive force is transmitted to the switch tube located in the embedding groove of the pressing plate through the pressing plate, so that the switch tube is close to the heat dissipation surface, thereby improving the tightness of contact between the switch tube and the heat dissipation surface, which can not only improve the position stability of the switch tube relative to the heat sink, but also improve the heat dissipation efficiency of the switch tube.

[0020] In technical solution three, clamping ribs are arranged on the inner surface of the groove wall of the embedding groove. During the embedding process of the switch tube, a large friction force will be generated between the switch tube and the surface of the clamping ribs. The switch tube is clamped by this friction force. There is no need to set up an additional fixing mechanism, and the switch tube can also be firmly fixed on the pressing sheet.

[0021] In technical solution four, a pair of elastic clamps are provided on the pressing sheet, and a clamping hole is provided on the circuit board. The elastic clamps can be clamped into the edge of the clamping hole. The pressing sheet and the circuit board are fixedly connected through the cooperation of the elastic clamps and the clamping hole. At this time, the circuit board is not only directly fixed to the radiator, but also further connected to the radiator through the pressing sheet. The fixed relationship among the circuit board, the pressing sheet and the radiator is more stable.

[0022] In technical solution five, a plug-in column is further provided on the pressing sheet, and the edge of the hole of the clamping hole is set as a first limiting portion and a second limiting portion. After the plug-in column is inserted into the clamping hole, the first limiting portion will limit the plug-in column, and after the elastic clamp head is clamped into the clamping hole, the second limiting portion will limit the elastic clamp head, thereby increasing the connection points between the pressing sheet and the circuit board, and it is less likely for the circuit board and the pressing sheet to move relative to each other. The pressing sheet is directly connected to the radiator, so it is less likely for the circuit board and the radiator to move relative to each other.

[0023] In technical solution six, a plurality of embedding grooves are provided on the pressing sheet, so that one pressing sheet can fix a plurality of switch tubes at the same time, and a plurality of switch tubes can be assembled at the same time, thereby improving the assembly efficiency of the switch tubes; at the same time, a screw hole is provided between two adjacent embedding grooves, and the pressing sheet is fixedly connected with the heat sink at the position of the screw hole through a fastener, and a fastener can apply force to the two switch tubes on both sides thereof to make them close to the heat sink, so that the force is more balanced, and the switch tube can be better attached to the heat sink; if the screw holes are set at a larger interval, the switch tube in the middle position will not be subjected to sufficient compressive force.

[0024] In Technical Solution 7, after the pin of the switch tube extends out from the tube body, it passes through the notch set on the side of the embedded groove, and then bends toward the circuit board and connects to the circuit board. The installation of the switch tube is more convenient, and the structure of embedding the switch tube into the embedded groove will not affect the connection between the pin and the circuit board.

[0025] In technical solution eight, abutment protrusions are provided at the bottom of the embedded groove of the pressing sheet. When the pressing sheet is locked by fasteners, the abutment protrusions will press against the second tube surface of the switch tube, so that the switch tube can be better close to the heat sink.

[0026] In technical solution nine, a receiving groove is provided on the heat dissipation surface, and the ceramic thermal conductive sheet is abutted against the bottom of the receiving groove, which is convenient for positioning the ceramic thermal conductive sheet and also allows the ceramic thermal conductive sheet to have a sufficient creepage distance. At the same time, one side surface of the ceramic thermal conductive sheet is flush with the edge of the groove of the receiving groove, which is convenient for error control.

[0027] In technical solution ten, a converter is provided, in which the power component provided by the above technical solution is arranged in a shell, and has the same technical advantages as the above technical solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic diagram of the structure of a power component provided in an embodiment of the utility model;

[0030] Figure 2 for Figure 1 The structural diagram of the radiator;

[0031] Figure 3 for Figure 1 Schematic diagram of the structure of the circuit board, switch tube, pressing sheet, and ceramic heat conducting sheet;

[0032] Figure 4 for Figure 3 A magnified view of part A;

[0033] Figure 5 for Figure 4 Schematic diagram of the structure of the medium-pressure tablet Figure 1 ;

[0034] Figure 6 for Figure 4 Schematic diagram of the structure of the medium-pressure tablet Figure 2 ;

[0035] Figure 7 for Figure 1 The structural diagram of the circuit board;

[0036] Figure 8 for Figure 7 Magnified view of part B.

[0037] Description of main reference numerals:

[0038] Circuit board 1; first board surface 2; heat sink 3; heat dissipation surface 4; switch tube 5; pin 6; pressing plate 7; embedding groove 8; first tube surface 9; fastener 10; clamping rib 11; elastic clamp head 12; second board surface 13; clamping hole 14; plug-in column 15; first limiting portion 16; second limiting portion 17; screw hole 18; tube body 19; notch 20; abutting protrusion 21; second tube surface 22; ceramic heat conductive sheet 23; accommodating groove 24; heat dissipation fin 25; locking hole 26. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0040] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0041] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the specific protection scope of the utility model.

[0042] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0043] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0044] Reference Figure 1 The embodiment of the utility model provides a power component with stable pin connection, which mainly includes a heat sink 3, a circuit board 1, a switch tube 5, a pressing plate 7 and a ceramic heat conductive plate 23. The number of the heat sink 3 is one, the number of the circuit board 1 can be one or more, the number of the switch tube 5, the pressing plate 7 and the ceramic heat conductive plate 23 is multiple, and each switch tube 5 corresponds to a ceramic heat conductive plate 23.

[0045] Reference Figure 1In this embodiment, the Z-axis direction shown in the figure is the first direction, the position of the heat sink 3 is the first side of the first direction, and the position of the circuit board 1 is the second side of the first direction; the X-axis direction or the Y-axis direction shown in the figure can be the second direction, which depends on how the pressing plate 7 is placed.

[0046] Reference Figure 1 The first side of the circuit board 1 in the first direction is provided with a first board surface 2, and the second side of the first direction is provided with a second board surface 13. The heat sink 3 is fixedly connected to the circuit board 1 and is located on the first side of the circuit board 1 in the first direction, referring to Figure 2 The heat sink 3 is provided with a heat dissipation surface 4 on the side facing the circuit board 1. The heat dissipation surface 4 is used to conduct heat to the switch tube 5, and a locking hole 26 is provided on the heat dissipation surface 4; at the same time, a heat dissipation fin 25 is provided on the first side of the heat sink 3. During operation, the airflow passes through the gaps between the heat dissipation fins 25, taking away the heat of the heat dissipation fins 25. The circuit board 1 and the heat sink 3 can be fixedly connected by bolts. Generally, through holes are provided at the outer periphery of the circuit board 1. After the bolts pass through the through holes, they cooperate with nuts to clamp the circuit board 1, and then the bolts are screwed to the heat sink 3, so as to realize the fixed connection between the circuit board 1 and the heat sink 3. This connection method can make the circuit board 1 suspended relative to the heat sink 3, which is convenient for the installation and setting of the switch tube 5.

[0047] The switch tube 5 is located at the first side of the first direction of the circuit board 1 and is connected to the circuit board 1 through the pin 6. Figure 3 and Figure 4 The main body of the switch tube 5 is a tube body 19, which is roughly a flat rectangular parallelepiped component, and the surface of the first side in the first direction forms a first tube surface 9, and the tube surface on the second side in the first direction forms a second tube surface 22, wherein the first tube surface 9 is close to the heat dissipation surface 4 of the radiator 3, and can directly or indirectly contact the heat dissipation surface 4 for heat conduction, thereby transferring the heat of the switch tube 5 to the radiator 3, and then dissipating the heat of the switch tube 5 through the radiator 3. Figure 4 ,exist Figure 4 In the two switch tubes 5 shown in the figure, the length direction thereof is along the Y-axis direction, the width direction thereof is along the X-axis direction, and the thickness direction thereof is along the Z-axis direction. Figure 4 The position of the middle pressure plate 7 is the first side of the Y-axis direction, and the opposite direction is the second side. The pin 6 on the switch tube 5 is arranged at the end of the second side of the tube body 19 in the Y-axis direction. After the pin 6 extends along the Y-axis direction perpendicular to the first direction, it is bent toward the circuit board 1 and connected to the circuit board 1 by welding.

[0048] Reference Figure 3 and Figure 4, the pressing sheet 7 is provided with an embedding groove 8 with a notch facing the heat sink 3 on the first side in the first direction. The switch tubes 5 are embedded and fixed to the embedding grooves 8 one by one, and the first tube surface 9 of the switch tube 5 is exposed in the embedding grooves 8. The pressing sheet 7 is fixed to the heat sink 3 and is located on the second side in the first direction of the heat sink 3, and the first tube surface 9 is in contact with the heat dissipation surface 4 for heat conduction. Among them, the pressing sheet 7 includes at least two embedding grooves 8, and each of the embedding grooves 8 on the pressing sheet 7 is arranged along a second direction perpendicular to the first direction, and a screw hole 18 penetrating the pressing sheet 7 along the first direction is provided between two adjacent embedding grooves 8 along the second direction. A notch 20 is provided on the groove side of the embedding groove 8 for the pin 6 to extend out. The pressing sheet 7 is provided with an abutting protrusion 21 at the bottom of each of the embedding grooves 8, and the abutting protrusion 21 abuts against the second tube surface 22 of the switch tube 5 embedded in the embedding groove 8 on the second side in the first direction.

[0049] In addition, refer to Figure 3 and Figure 4 , a plurality of fasteners 10 are also provided, and the fasteners 10 are locked toward the first side of the first direction to fix the pressing sheet 7 to the heat sink 3, and make the first tube surface 9 of the switch tube 5 located in the pressing sheet 7 close to the heat sink surface 4. The fasteners 10 pass through the screw holes 18 from the second board surface 13 of the circuit board 1 to lock the pressing sheet 7 to the heat sink 3.

[0050] Specifically, refer to Figure 5 The pressing sheet 7 includes a plate-shaped main body, and a side wall is protruding from the surface of the first side of the main body in the Z-axis direction. These side walls can be connected to each other to form an embedding groove 8. In one pressing sheet 7, two embedding grooves 8 are arranged along the X-axis direction, and a screw hole 18 is arranged in the middle of the two embedding grooves 8 and passes through along the Z-axis direction. The fastener 10 can pass through the screw hole 18 and be screwed and fixed with the locking hole 26 on the heat dissipation surface 4 of the heat sink 3, so as to fix the pressing sheet 7 on the heat sink 3. In this embodiment, each embedding groove 8 includes three main groove walls, and a notch 20 is arranged on one side of the groove wall. The notch 20 corresponds to the position of the pin 6 of the switch tube 5 after it is embedded in the embedding groove 8, so that the pin 6 can extend from the notch 20.

[0051] The inner surfaces of the two groove walls in the X-axis direction of the embedding groove 8 are provided with clamping ribs 11. After the switch tube 5 is embedded in the embedding groove 8, it is fixed with the clamping ribs 11 through friction fit. Specifically, the inner surfaces of the two groove walls in the X-axis direction of the embedding groove 8 are respectively provided with a plurality of clamping ribs 11. Taking one of the side walls as an example, the clamping ribs 11 protrude from the inner surface of the side wall and extend along the Z-axis direction. The number of the clamping ribs 11 is three, and the three clamping ribs 11 are distributed along the Y-axis direction; and the clamping ribs 11 are provided with a smooth inclined guide surface at the end close to the notch, so as to facilitate guiding the switch tube 5 to be embedded in the embedding groove 8. When the switch tube 5 is embedded in the embedding groove 8, the lower edge of the tube body 19 of the switch tube 5 first contacts the clamping rib 11, and then force is applied to the switch tube 5 so that the switch tube 5 is embedded in the embedding groove 8. At the same time, the friction between the tube body 19 of the switch tube 5 and the clamping rib 11 increases. The clamping rib 11 clamps the tube body 19 of the switch tube 5 through the friction force, so that the switch tube 5 will not easily fall out of the embedding groove 8, thereby realizing the self-clamping function.

[0052] Reference Figure 5 A contact protrusion 21 is provided at the bottom of the embedding groove 8. In this embodiment, the contact protrusion 21 is a structure extending along the Y-axis direction and protruding from the bottom of the groove. The protrusion is relatively low. When the switch tube 5 is embedded in the embedding groove 8, the contact protrusion 21 will abut against the second tube surface 22 of the tube body 19. By providing the contact protrusion 21, the switch tube 5 can be better abutted against the radiator 3, avoiding the switch tube 5 not being embedded in place when embedded in the embedding groove 8, resulting in the switch tube 5 and the radiator 3 not being abutted.

[0053] In this embodiment, the heat sink 3 is directly or indirectly fixed to the circuit board 1, and a pressing sheet 7 is provided. An embedding groove 8 is provided on the pressing sheet 7. Each switch tube 5 can be embedded and fixed in the embedding groove 8. The groove wall of the embedding groove 8 will limit the movement of the switch tube 5 in the lateral position of the embedding groove 8, so that the switch tube 5 and the pressing sheet 7 form a tightly connected whole through the fixed cooperation between the embedding groove 8 and the switch tube 5; then, the pressing sheet 7 is directly or indirectly fixed to the heat sink 3. Compared with the switch tube 5, the pressing sheet 7 can withstand a larger lock. Tightening force can also be fixed with the heat sink 3 in more ways. Therefore, when the pressing sheet 7 is fixed to the heat sink 3, it has better connection stability than directly fixing the switch tube 5 to the heat sink 3; at the same time, the notch of the embedded groove 8 can also expose the first tube surface 9 of the switch tube 5. When the pressing sheet 7 is fixed to the heat sink 3, the first tube surface 9 can contact and conduct heat with the heat dissipation surface 4 of the heat sink 3. Therefore, through the pressing sheet 7, not only the fixing problem of the switch tube 5 can be solved, but also the heat dissipation problem of the switch tube 5 can be solved simultaneously. Among them, the pressing sheet 7 should be made of insulating material, which can avoid heat transfer between the power tube and the circuit board 1, and improve the safety problem of the power tube.

[0054] In this embodiment, the switch tube 5 is in indirect contact with the heat dissipation surface 4 of the heat sink 3 through the ceramic heat conductive sheet 23 for heat conduction. Figure 3 A ceramic heat conducting sheet 23 is provided between the first tube surface 9 of the switch tube 5 and the heat dissipation surface 4 of the heat sink 3. Figure 2 , the heat dissipation surface 4 is provided with a receiving groove 24 corresponding to each pressing plate 7; one side surface of the ceramic heat conductive sheet 23 is closely attached to the groove bottom of the receiving groove 24, and the other side surface is flush with the notch edge of the receiving groove 24 and closely attached to the first tube surface 9. Specifically, the shape and size of the receiving groove 24 roughly correspond to the shape and size of the pressing plate 7, and the receiving groove 24 is slightly concave, so that the ceramic heat conductive sheet 23 can fall into the receiving groove 24, and the depth of the receiving groove 24 is roughly the same as the thickness of the ceramic heat conductive sheet 23, so that after the ceramic heat conductive sheet 23 falls into the receiving groove 24, the surface of the ceramic heat conductive sheet 23 on the second side in the Z-axis direction can be flush with the notch edge of the receiving groove 24, thereby ensuring close contact with the first tube surface 9 of the switch tube 5. It should be understood that the heat dissipation surface 4 in the radiator 3 includes not only the groove bottom and groove wall surface of the receiving groove 24, but also includes the part where the receiving groove 24 is not provided.

[0055] In addition, refer to Figure 2 A locking hole 26 is provided in the middle of the receiving groove 24. The position of the locking hole 26 corresponds to the position of the screw hole 18 on the corresponding pressing plate 7. The fastener 10 can pass through the screw hole 18 from the second board surface 13 of the circuit board 1, and then be screwed and fixed to the locking hole 26 on the heat sink 3, so as to fix the pressing plate 7 and the switch tube 5 on the heat sink 3 together. In the process of fastening the fastener 10, the fastener 10 will apply a compressive force toward the heat sink 3 to the pressing plate 7, and this compressive force will be transmitted to the switch tube 5 located in the embedding groove 8 of the pressing plate 7 through the pressing plate 7, so that the switch tube 5 is close to the heat dissipation surface 4, thereby improving the closeness of the contact between the switch tube 5 and the heat dissipation surface 4, which can not only improve the position stability of the switch tube 5 relative to the heat sink 3, but also improve the heat dissipation efficiency of the switch tube 5.

[0056] Reference Figure 6 , Figure 7 and Figure 8, a pair of elastic clamps 12 with opposite clamping directions are provided on the second side of the first direction of the pressing sheet 7; a second board surface 13 is provided on the second side of the first direction of the circuit board 1, and a clamping hole 14 is provided which passes through the first board surface 2 and the second board surface 13; the same pair of elastic clamps 12 are passed through the corresponding clamping holes 14, and are clamped with the edge of the clamping hole 14 located on the second board surface 13. The pressing sheet 7 is provided with a plug-in column 15 between the same pair of elastic clamps 12; the edge of the clamping hole 14 is provided with a first limiting portion 16 and a second limiting portion 17, the first limiting portion 16 is suitable for the insertion of the plug-in column 15 and limits the movement of the plug-in column 15 in other directions perpendicular to the first direction, and the second limiting portion 17 is clamped with the elastic clamp 12 and limits the movement of the elastic clamp 12 in other directions perpendicular to the first direction and its clamping direction.

[0057] Specifically, refer to Figure 6 In the middle position of the surface of the second side of the first direction of the pressing plate 7, there is a protruding plug-in column 15. The position of this plug-in column 15 just corresponds to the position of the screw hole 18 of the pressing plate 7. Therefore, the inner side of the plug-in column 15 is hollow so that the screw hole 18 can be exposed. Two elastic clamps 12 are respectively arranged on both sides of the plug-in column 15 in the X-axis direction. The two elastic clamps 12 form a pair, and the clamping directions of the two are opposite to each other. The clamping direction of one elastic clamp 12 is along the first side of the X-axis direction, and the other is along the second side of the X-axis direction. The function of the clamping directions of the elastic clamps 12 being opposite to each other is to limit the movement of the paired elastic clamps 12 in the X-axis direction after clamping. Among them, the plug-in column 15 is cylindrical.

[0058] Reference Figure 7 and Figure 8 A clamping hole 14 is provided at a corresponding position of the circuit board 1, and the edge of the clamping hole 14 forms a first limiting portion 16 and a second limiting portion 17, wherein the shape of the first limiting portion 16 is adapted to the shape of the plug-in column 15, and the shape of the second limiting portion 17 is adapted to the shape of the elastic clamp 12, and the second limiting portion 17 is also provided with two soldiers located on both sides of the first limiting portion 16 in the second direction. The pressing sheet 7 can be clamped to the second limiting portion 17 of the clamping hole 14 through the elastic clamp 12, at which time the clamping surface of the elastic clamp 12 buckles the second board surface 13 of the circuit board 1, and the plug-in column 15 is also inserted into the first limiting portion 16 of the clamping hole 14. Through the cooperation between the first limiting portion 16 and the plug-in column 15, the pressing piece 7 is limited in all directions perpendicular to the first direction; through the cooperation between the second limiting portion 17 and the elastic clamp 12, the pressing piece 7 and the circuit board 1 form a snap fit in the first direction. This snap fit increases the connection points between the pressing piece 7 and the circuit board 1, so that the pressing piece 7, the circuit board 1 and the heat sink 3 form a tighter whole, reducing the influence of vibration on the connection firmness of the pin 6 of the switch tube 5.

[0059] In addition, an embodiment of the utility model further provides a converter, which includes a housing, and the above-mentioned power component is arranged inside the housing.

[0060] The description of the above specification and embodiments is used to explain the protection scope of the utility model, but does not constitute a limitation on the protection scope of the utility model. Through the enlightenment of the utility model or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent replacements or other improvements to the embodiments of the utility model or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the utility model.

Claims

1. A power component with a stable pin connection, characterized in that: include: A circuit board (1), wherein a first side in a first direction thereof is provided with a first board surface (2); A heat sink (3) which is fixedly connected to the circuit board (1) and is located on a first side of the circuit board (1) in a first direction, and is provided with a heat dissipation surface (4) facing the circuit board (1); a plurality of switch tubes (5), each of the switch tubes (5) being located on a first side of the circuit board (1) in a first direction and connected to the circuit board (1) via a pin (6); and A plurality of pressing sheets (7), each pressing sheet (7) being provided with an embedding groove (8) with a notch facing the heat sink (3) on a first side in a first direction; The switch tubes (5) are embedded and fixed in the embedding grooves (8) in a one-to-one correspondence, and their first tube surfaces (9) facing the first side in the first direction are exposed from the embedding grooves (8); the pressing sheet (7) is fixed to the heat sink (3) and is located on the second side in the first direction of the heat sink (3), and the first tube surface (9) is in contact with the heat dissipation surface (4) for heat conduction.

2. A power component with stable pin connection as claimed in claim 1, characterized in that: It also includes a plurality of fasteners (10) which are locked toward a first side in a first direction to fix the pressing sheet (7) to the heat sink (3) and to allow a first tube surface (9) of a switch tube (5) located in the pressing sheet (7) to be close to the heat sink surface (4).

3. A power component with stable pin connection as claimed in claim 2, characterized in that: The inner surface of the groove wall of the embedding groove (8) is provided with a clamping rib (11), and after the switch tube (5) is embedded in the embedding groove (8), it is fixed with the clamping rib (11) through friction fit.

4. A power component with stable pin connection as claimed in claim 3, characterized in that: The second side of the pressing plate (7) in the first direction is provided with a pair of elastic clamps (12) with clamping directions opposite to each other; the second side of the circuit board (1) in the first direction is provided with a second board surface (13), and is provided with a clamping hole (14) passing through the first board surface (2) and the second board surface (13); the same pair of elastic clamps (12) are passed through the corresponding clamping holes (14) and are clamped with the clamping holes (14) located at the hole edges of the second board surface (13).

5. A power component with stable pin connection as claimed in claim 4, characterized in that: The pressing sheet (7) is provided with a plug-in column (15) between the same pair of the elastic clamps (12); the edge of the clamping hole (14) is provided with a first limiting portion (16) and a second limiting portion (17), the first limiting portion (16) is suitable for allowing the plug-in column (15) to be inserted and limiting the movement of the plug-in column (15) in other directions perpendicular to the first direction, and the second limiting portion (17) is engaged with the elastic clamp (12) and limits the movement of the elastic clamp (12) in other directions perpendicular to the first direction and its clamping direction.

6. A power component with stable pin connection as claimed in claim 5, characterized in that: The pressing plate (7) comprises at least two embedding grooves (8); each embedding groove (8) on the pressing plate (7) is arranged along a second direction perpendicular to the first direction, and a screw hole (18) penetrating the pressing plate (7) along the first direction is provided between two adjacent embedding grooves (8) along the second direction, and the fastener (10) penetrates the screw hole (18) from the second board surface (13) of the circuit board (1) to lock the pressing plate (7) to the heat sink (3).

7. A power component with stable pin connection as claimed in claim 6, characterized in that: The tube body (19) of the switch tube (5) is embedded and fixed in the embedding groove (8), and its pin (6) extends from the tube body (19) perpendicularly to a first direction and is bent toward the circuit board (1) to be connected to the circuit board (1); a notch (20) is provided on the groove side of the embedding groove (8) for the pin (6) to extend out.

8. A power component with stable pin connection as claimed in claim 7, characterized in that: The pressing sheet (7) is provided with a contact protrusion (21) at the bottom of each of the embedding grooves (8), and the contact protrusion (21) abuts against a second tube surface (22) of the switch tube (5) embedded in the embedding groove (8) and located on the second side in the first direction.

9. A power component with stable pin connection as claimed in claim 8, characterized in that: It also includes a ceramic heat conducting sheet (23); the heat dissipation surface (4) is provided with a recessed receiving groove (24) corresponding to each pressing sheet (7); one side surface of the ceramic heat conducting sheet (23) is in close contact with the bottom of the receiving groove (24), and the other side surface is flush with the notch edge of the receiving groove (24) and in close contact with the first tube surface (9).

10. A converter, comprising a housing, characterized in that: The housing is provided with a power component with a stable pin connection as described in any one of claims 1 to 9.

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