Heat dissipation structure convenient to assemble and disassemble and switching power supply

Abstract

The utility model relates to the technical field of heat dissipation, and discloses a heat dissipation structure convenient to assemble and disassemble and a switching power supply, the heat dissipation structure comprises a radiator and a DC / DC conversion circuit assembly, the DC / DC conversion circuit assembly at least comprises a high-frequency transformer, a switching tube, a circuit board and a heat conduction structural member, and pins of the high-frequency transformer and the switching tube are connected to the circuit board; a circuit board of the DC / DC conversion circuit assembly is fixed on the heat conduction structural member; the DC / DC conversion circuit assembly is fixed on the radiator by a fastener through the heat conduction structural member of the DC / DC conversion circuit assembly; a threaded through hole with an auxiliary dismounting function is further designed in the heat conduction structural part, a screw penetrates through the threaded through hole, a screw rod of the screw makes contact with the radiator, the heat conduction plate is jacked up through the screw rod of the screw, and the heat conduction structural part is separated from the radiator. The switch source provided by the utility model comprises the heat radiation structure, has the advantages of simple structural design, low cost and convenient maintenance, can save the internal maintenance space of the power supply, and improves the maintainability of the power supply.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology, specifically to a heat dissipation structure that is easy to install and disassemble, and a switching power supply using the structure. Background Technology

[0002] Switching power supplies mainly consist of functional circuits such as EMI circuits, surge suppression, power factor correction, high-voltage filtering, DC / DC conversion, microcontroller control, and auxiliary power supply. The main losses are concentrated in the power factor correction circuit and the DC / DC conversion circuit components. To ensure that the components do not exceed the specified maximum allowable temperature under their operating environment conditions, a cooling system is usually required to transfer the heat generated during normal operation to the heat sink. In existing technologies, the power factor correction circuit and the DC / DC conversion circuit are modularly designed for easy assembly, debugging, and maintenance. The heat generated during normal operation is transferred to the heat dissipation surface through a heat-conducting plate. Depending on the application, sometimes the switching power supply is designed as a module, with the main internal heat transferred to the heat dissipation surface through a heat-conducting plate. To reduce the contact thermal resistance between the heat-conducting plate and the heat dissipation surface, interfacial thermally conductive materials are typically used. When insulation is not required, thermal grease is typically used as the interface material between the heatsink and the heatsink. It features high thermal conductivity, low thermal resistance, high thixotropy, and low cost. The heatsink is mechanically mounted on the heatsink surface, with thermal grease filling the contact area between the two. The larger the contact area, the stronger the adhesion, making it very difficult to remove the heatsink during maintenance, especially in situations where the internal space of the power supply is very compact, resulting in insufficient operating space. Other functional units within the power supply need to be removed before the heatsink can be moved slowly, weakening the adhesion effect. This increases maintenance time, and removing other functional units also reduces the reliability of the power supply. Summary of the Invention

[0003] To address the problem of difficulty in disassembly and assembly during maintenance when the heat-conducting plate of the heat dissipation structure of the existing switching power supply is mechanically fixed to the heat dissipation surface after applying thermal grease, this utility model provides a heat dissipation structure that is easy to install and disassemble, and features simple structure, low cost, and convenient disassembly and assembly.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A convenient heat dissipation structure includes a heat sink and a DC / DC converter circuit assembly. The DC / DC converter circuit assembly includes at least a high-frequency transformer, a switching transistor, a circuit board, and a heat-conducting structural component. The pins of the high-frequency transformer and the switching transistor are connected to the circuit board. The circuit board of the DC / DC converter circuit assembly is fixed to the heat-conducting structural component. The DC / DC converter circuit assembly is then fixed to the heat sink by fasteners through its heat-conducting structural component. The heat-conducting structural component is also designed with threaded through holes to assist in disassembly and assembly. A screw passes through these threaded through holes, and the screw shank contacts the heat sink, allowing the heat-conducting structural component to be separated from the heat sink through the screw shank.

[0006] Preferably, the threaded through hole designed on the heat-conducting structural component for assisting in disassembly and assembly has a countersunk hole with a diameter larger than the threaded through hole at the end that contacts the heat sink.

[0007] Preferably, the DC / DC converter circuit assembly is fixed to the heat sink via its thermally conductive structure, and thermally conductive silicone grease is uniformly applied between the contact surfaces of the thermally conductive structure and the heat sink.

[0008] Preferably, the heat-conducting structural component is designed with a concave cavity formed by milling, the high-frequency transformer is fixed in the concave cavity by potting compound, and the switching tube is fixed on the heat-conducting structural component by a pressure plate.

[0009] Preferably, a thermally conductive pad is attached between the contact surface of the switching tube and the thermally conductive structural component.

[0010] Another objective of this invention is to provide a switching power supply that includes a heat dissipation structure as described in any of the above-described technical solutions.

[0011] This utility model provides a heat dissipation structure and switching power supply that are easy to install and disassemble. The effective effects of adopting the above-mentioned technical solution are as follows: the heat-conducting plate in the heat dissipation structure is designed with threaded holes for assisting disassembly and assembly. During maintenance, a screw is passed through the threaded hole, and the heat-conducting plate is lifted by the screw shaft, eliminating the adhesive force between the heat-conducting plate and the heat sink surface. It has the advantages of simple structural design, low cost, simple and convenient operation, no need to disassemble other functional units, saving internal maintenance space of the power supply, and improving the maintainability of the power supply. Attached Figure Description

[0012] Figure 1 The image shows three views of the DC / DC converter circuit assembly in an embodiment of the conveniently assembled and disassembled heat dissipation structure of this utility model.

[0013] Figure 2 The three views are of the heat-conducting plate in an embodiment of the heat dissipation structure of this utility model that is easy to assemble and disassemble.

[0014] Figure 3This is a front view of an embodiment of the heat dissipation structure of this utility model that is easy to assemble and disassemble.

[0015] Figure 4 This is a view from direction A of an embodiment of the heat dissipation structure for easy assembly and disassembly of this utility model.

[0016] In the diagram: 1. Thermal pad SP900; 2. Switching transistor; 3. Circuit board; 4. High-frequency transformer; 5. Encapsulating compound SC-320LVH; 6. Heat-conducting plate; 7. Heat sink; 8. DC / DC converter circuit assembly; 9. M3 screw. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown in the figure, in one embodiment of the heat dissipation structure of this utility model that is easy to assemble and disassemble, there are a switching tube 2, a circuit board 3, a high-frequency transformer 4, a heat-conducting plate 6, and a heat sink 7. The heat-conducting plate 6 is made of 6061 material and is machined by CNC milling. It has the characteristics of being lightweight and having good thermal conductivity. The heat-conducting plate 6 is designed with M3 threaded holes for assisting in assembly and disassembly. Its contact surface with the heat sink 7 has countersunk holes φ5. The purpose is to avoid the damage to the surface finish of the heat sink 7 when the screw of the M3 screw 9 contacts the heat sink surface. When the DC / DC converter circuit component is repaired and reinstalled, the countersunk holes φ5 can be avoided to prevent the heat-conducting plate 6 from being locally lifted and increasing the contact thermal resistance. The heat sink 7 is made of 6061 material and is processed into a water-cooled heat sink by friction stir welding. It has the characteristics of being lightweight and having high heat dissipation efficiency.

[0019] In this embodiment, the transformer 4 is fixed inside the heat-conducting plate 6 using potting compound SC-320LVH; the switching transistor 2 is fixed to the heat-conducting plate 6 using a pressure plate. To reduce the thermal resistance between the switching transistor 2 and the heat-conducting plate 6, a thermally conductive pad SP900 is attached between the contact surfaces of the switching transistor 2 and the heat-conducting plate 6. 1. After the circuit board 3 is fixed to the heat-conducting plate 6 with screws, the pins of the switching transistor 2 are soldered to the corresponding pad holes of the circuit board 3 to form the DC / DC converter assembly 8. The DC / DC converter assembly 8 is fixed to the heat sink 7 with screws. At the same time, in order to reduce the thermal resistance between the heat-conducting plate 6 and the heat sink 7, a layer of thermal grease YG6260 is evenly applied between the contact surfaces of the heat-conducting plate 6 and the heat sink 7 in the DC / DC converter assembly 8. The losses generated by the switching transistor 2 and the transformer 4 in the DC / DC converter assembly 8 during normal operation of the power supply are conducted to the heat sink 7 in the form of heat through the heat-conducting plate 6 for heat dissipation. During maintenance, the screws fixing the DC / DC converter assembly 8 are removed, and then the M3 screw 9 is passed through the threaded hole of the heat-conducting plate 6 which has the function of assisting disassembly and assembly. The M3 screw 9 is continuously tightened until its screw contacts the heat sink 7. The screw of the M3 screw 9 lifts up the heat-conducting plate 6, thereby achieving the purpose of removing the DC / DC converter assembly 8.

[0020] This utility model also provides a switching power supply, which includes the above-mentioned heat dissipation structure that is easy to install and remove, has strong heat dissipation capacity and good maintainability.

[0021] Based on the above, this utility model provides a convenient heat dissipation structure and switching power supply, which features simple structure, low cost, convenient maintenance and debugging, and no increase in maintenance space. It solves the problem in existing technologies where, after modularizing the power factor correction circuit and DC / DC conversion circuit components in a switching power supply, the contact surface between the heat-conducting plate and the heat sink is mechanically fixed by applying thermal grease, leading to difficulties in disassembly and assembly during maintenance. This invention is worthy of promotion. The basic principles, main features, and advantages of this utility model have been shown and described above. Those skilled in the art should understand that this utility model is not limited to the above embodiments.

[0022] The foregoing has shown and described the main features and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments.

[0023] Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

Claims

1. A heat dissipation structure that is easy to install and remove, comprising a heat sink and a DC / DC converter circuit assembly, wherein the DC / DC converter circuit assembly includes at least a high-frequency transformer, a switching transistor, a circuit board, and a heat-conducting structural component, wherein the pins of the high-frequency transformer and the switching transistor are both connected to the circuit board; the circuit board of the DC / DC converter circuit assembly is fixed to the heat-conducting structural component; characterized in that: The DC / DC converter circuit assembly is fixed to the heat sink by fasteners through its thermally conductive structure. The thermally conductive structure is also designed with threaded through holes to assist in disassembly and assembly. A screw is passed through this threaded through hole, and the screw shank contacts the heat sink. The thermally conductive structure can be separated from the heat sink through the screw shank.

2. The heat dissipation structure for easy assembly and disassembly according to claim 1, characterized in that: The threaded through hole designed on the heat-conducting structural component for auxiliary disassembly and assembly has a countersunk hole with a diameter larger than the threaded through hole at the end that contacts the heat sink.

3. The heat dissipation structure for easy assembly and disassembly according to claim 1, characterized in that: The DC / DC converter circuit assembly is fixed to the heat sink via its thermally conductive structure, and thermally conductive silicone grease is evenly applied between the contact surfaces of the thermally conductive structure and the heat sink.

4. The heat dissipation structure for easy assembly and disassembly according to claim 1, characterized in that: The heat-conducting structural component is designed with a concave cavity formed by milling. The high-frequency transformer is fixed in the concave cavity by potting compound. The switching tube is fixed on the heat-conducting structural component by a pressure plate.

5. The heat dissipation structure for easy assembly and disassembly according to claim 4, characterized in that: A thermally conductive pad is attached between the contact surface of the switching tube and the thermally conductive structural component.

6. A switching power supply, characterized in that, Includes the heat dissipation structure as described in any one of claims 1 to 5.

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