CN221652877U - Mounting structure of power device and switching power supply - Google Patents

Abstract

The utility model discloses a mounting structure of a power device and a switching power supply, wherein the mounting structure of the power device comprises a radiator and a DC/DC conversion module; the DC/DC conversion module comprises a high-frequency transformer, a plurality of power devices, a circuit board and a fixed box with an opening on the top surface; the high-frequency transformer is fixed in the fixed box through pouring sealant, the power devices are arranged around the fixed box, the radiating surfaces of the power devices are attached to the side plates around the fixed box and are fixed on the side plates through screws, and the circuit board is fixed on the opening surface of the fixed box; the power device is vertically welded on the circuit board; the bottom plate of the fixed box is fixed with the radiator through screws. The power device mounting structure adopts a modularized design, is convenient to maintain and debug, and the fixed box is used as a radiating substrate, so that the repeated design of the substrate is avoided, and the cost is saved; the switching power supply provided by the utility model comprises the mounting structure of the power device, fully utilizes the layout of the circuit board to reduce the power supply volume, and has higher power density.

Description

A power device mounting structure and switching power supply

Technical Field

The utility model relates to the technical field of switch power supplies, in particular to a mounting structure of power devices thereof.

Background Art

Switching power supplies are widely used in various electronic devices due to their high efficiency and small size. Small size and high power density are important directions for the development of switching power supply technology. Switching power supplies are mainly composed of EMI circuits, surge suppression, power factor correction modules, high-voltage filters, DC/DC conversion modules, single-chip microcomputer control and auxiliary power supply circuits. The DC/DC conversion module is composed of power devices such as high-frequency switching tubes and high-frequency transformers and other components. In the prior art, the high-frequency transformer is fixed in a fixed box by potting glue and then fixed to the heat sink. The high-frequency switching tube is also directly installed on the heat sink surface, which will limit the PCB layout space, resulting in an increase in the required PCB area, thereby increasing the overall volume of the power supply, which is not conducive to the miniaturization design of the power supply and the cost is difficult to reduce.

Summary of the invention

In order to solve the above-mentioned deficiencies in the installation structure of power devices in the switching power supply in the prior art, the utility model provides a novel installation structure of power devices and a switching power supply having the structure, which can reduce the volume of the switching power supply and improve the power density of the switching power supply.

In order to achieve the above-mentioned object, in a first aspect, the utility model provides a mounting structure of a power device.

Including heat sink and DC/DC conversion module;

The DC/DC conversion module at least includes a high-frequency transformer, a plurality of power devices, a circuit board and a fixing box with an opening on the top surface;

The high-frequency transformer of the DC/DC conversion module is fixed in a fixing box with an opening on the top surface by potting glue, and a plurality of the power devices are arranged around the fixing box, and the heat dissipation surfaces of the power devices are all attached to the side panels around the fixing box and fixed to the side panels of the fixing box by screws, and the circuit board is fixed on the opening surface of the fixing box; the plurality of the power devices are vertically welded to the circuit board;

The bottom plate of the fixing box of the DC/DC conversion module is fixed to the heat sink by screws.

Furthermore, thermally conductive pads are pasted between the heat dissipation surfaces of the plurality of power devices and the side plates of the fixing box.

Furthermore, the plurality of power devices are high-frequency switching tubes or diodes.

Furthermore, the fixing box is made of heat-conductive metal.

Furthermore, the contact surface where the bottom plate of the fixing box and the heat sink are fixed to each other is coated with thermal conductive silicone grease.

In a second aspect, the utility model further provides a switching power supply, which includes a mounting structure of a power device as in any of the above technical solutions.

The utility model adopts the above technical solution, which brings the following effective effects: the DC/DC conversion module of the switching power supply assembles the main parts and components such as the circuit board, the switch tube, and the high-frequency transformer together through a fixing box, and performs modular design to facilitate maintenance and function debugging. At the same time, the fixing box also serves as a heat dissipation substrate of the module, avoiding repeated design of the module substrate and saving costs; in addition, it also improves the utilization rate of the PCB board layout, effectively reduces the overall volume of the switching power supply, and improves the power density of the switching power supply.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of an embodiment of a switching power supply of the utility model;

FIG2 is a front view of a DC/DC conversion module in an embodiment of the present utility model;

FIG3 is a top view of a DC/DC conversion module in an embodiment of the present utility model;

FIG4 is an axonometric view of a DC/DC conversion module in an embodiment of the present utility model;

FIG5 is a front view of the high frequency transformer in the embodiment of the utility model installed in the fixing box;

FIG6 is a top view of the high frequency transformer in the embodiment of the utility model installed in the fixing box.

In the figure: 1. DC/DC conversion module; 2. Radiator; 3. Fixing box; 4. Thermal pad; 5. High-frequency switch tube; 6. Circuit board; 7. High-frequency transformer; 8. Potting glue.

Implementation

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

As shown in FIGS. 1 to 6, in the embodiment, a power device installation structure includes a DC/DC full-bridge conversion circuit module 1 and a heat sink 2; wherein the DC/DC full-bridge conversion circuit module 1 includes a fixing box 3, a thermal pad 4, a plurality of high-frequency switch tubes 5, a circuit board 6, and a high-frequency transformer 7; the heat sink 2 is made of 6061 material and processed by stir friction welding to form a water-cooled heat sink, which has the characteristics of light weight and efficient heat dissipation; the fixing box 3 is made of 6061 material and processed by CNC milling to form a structure with an open top surface, which has the characteristics of light weight and good thermal conductivity; the DC/DC full-bridge conversion circuit module 1 includes a fixing box 3, a thermal pad 4, a plurality of high-frequency switch tubes 5, a circuit board 6, and a high-frequency transformer 7; the heat sink 2 is made of 6061 material and processed by stir friction welding to form a water-cooled heat sink, which has the characteristics of light weight and high efficiency heat dissipation; the fixing box 3 is made of 6061 material and processed by CNC milling to form a structure with an open top surface, which has the characteristics of light weight and good thermal conductivity; The high-frequency transformer 7 of the conversion circuit module 1 is fixed in the fixing box 3 by potting glue 8; in order to utilize the vertical space inside the power supply and based on the consideration of maximizing the power supply cost and internal space utilization, multiple high-frequency switch tubes 5 are arranged around the fixing box 3, and their heat dissipation surfaces are all closely attached to the surrounding side panels of the fixing box 3, and are fixed to the surrounding side panels of the fixing box 3 by screws. At the same time, in order to reduce the thermal resistance between the high-frequency switch tube 5 and the fixing box 3 and the insulation between the pins of the high-frequency switch tube 5 and the fixing box 3, SP900 thermal conductive pads 2 are pasted between the contact surfaces of the high-frequency switch tube 5 and the fixing box 3 ; The circuit board 6 is fixed to the opening surface of the fixing box 3 by screws, the high-frequency transformer 7 is electrically connected to the circuit board, and the pins of multiple high-frequency switch tubes 5 are welded correspondingly to the pad holes of the circuit board 6, that is, multiple high-frequency switch tubes 5 are vertically welded to the circuit board 6, and the bottom plate of the fixing box 3 in the assembled DC/DC full-bridge conversion module 1 is fixed to the radiator 2 by screws. At the same time, in order to reduce the thermal resistance between the fixing box 3 and the radiator 2, a layer of thermal conductive silicone grease YG6260 is evenly applied between the contact surfaces of the fixing box 3 and the radiator 2; the losses generated by the high-frequency switch tubes 5 and the high-frequency transformer 7 in the DC/DC full-bridge conversion module 1 when the power supply is working normally are conducted to the radiator 2 in the form of heat through the fixing box 3 for heat dissipation.

Based on the above, the installation and heat dissipation structure of a power device of the utility model has the characteristics of simple structure, low cost, convenient installation, maintenance and debugging, and small size. It solves the problem that in the prior art, the high-frequency transformer is fixed in the fixing box by potting glue, and the high-frequency switch tube is directly installed on the radiator surface, which limits the PCB layout space, increases the required PCB area, and thus increases the overall volume of the power supply.

The above shows and describes the main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments.

Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included in the protection scope of this utility model.

Claims (6)

1. The mounting structure of the power device is characterized by comprising a radiator and a DC/DC conversion module;

The DC/DC conversion module at least comprises a high-frequency transformer, a plurality of power devices, a circuit board and a fixed box with an opening on the top surface;

the high-frequency transformer of the DC/DC conversion module is fixed in a fixed box with an opening at the top surface through pouring sealant, a plurality of power devices are arranged around the fixed box, radiating surfaces of the power devices are attached to side plates around the fixed box and fixed on the side plates through screws, and a circuit board is fixed on the opening surface of the fixed box; a plurality of power devices are vertically welded on the circuit board;

the bottom plate of the fixing box is fixed with the radiator through screws.

2. The mounting structure of power device according to claim 1, wherein heat-conducting pads are adhered between the heat-dissipating surfaces of the plurality of power devices and the side plates of the fixing case.

3. The mounting structure of the power device according to claim 2, wherein a plurality of the power devices are high-frequency switching transistors or diodes.

4. The mounting structure of a power device according to claim 1, wherein the material of the fixing case is a heat conductive metal.

5. The mounting structure of the power device according to claim 1, wherein a contact surface where the bottom plate of the fixing case and the heat sink are fixed to each other is coated with heat conductive silicone grease.

6. A switching power supply comprising the mounting structure of a power device according to any one of claims 1 to 5.