Double-transistor forward switching power supply

Abstract

The utility model relates to the technical field of switching power supplies, and discloses a double-transistor forward switching power supply, which comprises a bottom plate, two sides of the top end of the bottom plate are fixedly connected with limiting plates, the end face of the top end of the bottom plate is provided with a mounting groove, the mounting groove is located between the two limiting plates, and the bottom plate is provided with a circuit board based on the interior of the mounting groove. And a bolt is arranged on the circuit board in a penetrating manner and is in threaded connection with the bottom plate. According to the technical scheme, the supporting plate can be installed through the limiting plates, the dustproof net plate can be clamped between the two limiting plates and supported at the top end of the supporting plate, the powerful magnet and the iron sheet are close to each other to achieve the attraction effect, and therefore the dustproof net plate can be fixed and can be directly pulled upwards in the disassembling process, and the dustproof net plate can be conveniently disassembled. Through mutual cooperation of all the structures, the dustproof net plate can be flexibly disassembled and assembled, and disassembly and cleaning of the dustproof net plate are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of switching power supplies, in particular to a double-tube forward switching power supply. Background Art

[0002] The forward switching power supply is a common power supply topology that transfers energy through a transformer. Unlike the flyback circuit, it is mainly used in medium power applications. According to the number of power switch tubes on the primary side of the transformer, the forward switching power supply is divided into a single-tube forward switching power supply and a dual-tube forward switching power supply. The dual-tube forward switching power supply performs magnetic reset through a diode in series with the power switch, and does not require an additional reset circuit. At the same time, the power switch voltage stress of the dual-tube forward switching power supply is equal to the input voltage, while the voltage stress of the switch tube of the single-tube forward circuit is twice the input voltage.

[0003] Most existing switching power supplies are equipped with dustproof mesh plates, which are usually fixed to the outside of the switching power supply by bolts to prevent dust. However, dust and impurities are usually accumulated in the mesh holes of the dustproof mesh plates, which need to be frequently disassembled and cleaned. Disassembly tools are required for disassembly, which is not convenient. Therefore, a dual-tube forward switching power supply is needed. Utility Model Content

[0004] The utility model aims to provide a double-tube forward switching power supply, which solves the problems raised in the background technology.

[0005] An embodiment of the present application provides a dual-tube forward switching power supply, including a base plate, both sides of the top of the base plate are fixedly connected to limit plates, the top end face of the base plate is provided with a mounting groove, the mounting groove is located between the two limit plates, the base plate is installed with a circuit board based on the inside of the mounting groove, the circuit board is penetrated by bolts, the bolts are threadedly connected to the base plate, the outer walls on the opposite sides of the two limit plates are fixedly connected to support plates, the top of the support plate is fixedly connected to an iron sheet, a dustproof mesh plate is snap-connected between the two limit plates, the top of the dustproof mesh plate is fixedly connected to a strong magnet, and the strong magnet is suction-connected to the iron sheet.

[0006] In this technical solution, when the circuit board of the dual-tube forward switching power supply needs to be installed, the circuit board can be placed in the installation groove on the base plate and then fixed with bolts. After that, the dustproof mesh plate is clamped between the two limit plates and then pressed down until the dustproof mesh plate is supported on the top of the support plate. At this time, the strong magnet and the iron sheet are close to produce an attraction effect, thereby achieving the fixation of the dustproof mesh plate. When disassembling, the dustproof mesh plate can be directly pulled up until the strong magnet is separated from the iron sheet. Through the mutual cooperation of the above structures, the dustproof mesh plate can be flexibly disassembled and assembled, which is convenient for disassembly and cleaning of the dustproof mesh plate.

[0007] Optionally, there are four powerful magnets in total, and the four powerful magnets are respectively located at the four corners of the top end of the dustproof mesh plate.

[0008] The adoption of the above technical solution is helpful to improve the firmness of the installation of the dustproof screen.

[0009] Optionally, mounting holes are provided at the four corners of the base plate.

[0010] The adoption of the technical solution is beneficial to the installation of the base plate.

[0011] Optionally, the notch of the mounting slot is adapted to the body of the circuit board.

[0012] The adoption of the above technical solution is helpful to improve the stability of circuit board installation.

[0013] Optionally, a through-type heat dissipation groove is opened at the bottom end of the base plate, and a plurality of dustproof nets and a plurality of heat dissipation fins are alternately arranged inside the heat dissipation groove.

[0014] By adopting the above technical solution, the heat dissipation at the bottom of the circuit board is facilitated and the dust-proof effect is improved.

[0015] Optionally, the dustproof screen plate is an aluminum plate.

[0016] The adoption of the above technical solution is beneficial to improving the corrosion resistance of the dustproof screen.

[0017] Optionally, threaded holes matching the bolts are provided on the bottom plate.

[0018] The adoption of the technical solution is conducive to the rapid disassembly and assembly of the bolts.

[0019] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0020] The technical solution of the present application can realize the installation of the support plate through the limit plate, and the dustproof mesh plate can be clamped between the two limit plates and supported on the top of the support plate. The strong magnet and the iron sheet are close to each other to produce a suction effect, thereby realizing the fixation of the dustproof mesh plate. When disassembling, the dustproof mesh plate can be directly pulled upwards until the strong magnet is separated from the iron sheet. Through the mutual cooperation of the above structures, the dustproof mesh plate can be flexibly disassembled and assembled, which is convenient for disassembly and cleaning of the dustproof mesh plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of a dual-tube forward switching power supply of the utility model;

[0023] Figure 2 This is a schematic diagram of the disassembly structure of a dustproof screen plate of a dual-tube forward switching power supply of the utility model;

[0024] Figure 3 This is a schematic diagram of the disassembly structure of a circuit board of a dual-tube forward switching power supply of the utility model;

[0025] Figure 4 The utility model is a schematic diagram of an enlarged structure of region A of a circuit board of a dual-tube forward switching power supply.

[0026] In the figure: 1. Base plate; 2. Limit plate; 3. Support plate; 4. Mounting hole; 5. Bolt; 6. Mounting slot; 7. Circuit board; 8. Iron sheet; 9. Dustproof mesh plate; 10. Strong magnet; 11. Threaded hole; 12. Dustproof mesh; 13. Heat sink; 14. Heat sink. DETAILED DESCRIPTION

[0027] See also Figure 1-4 The utility model provides a technical solution: a dual-tube forward switching power supply, including a base plate 1, both sides of the top of the base plate 1 are fixedly connected to limit plates 2, the top end surface of the base plate 1 is provided with a mounting groove 6, the mounting groove 6 is located between the two limit plates 2, the base plate 1 is based on the inside of the mounting groove 6 to install a circuit board 7, the circuit board 7 is penetrated by a bolt 5, the bolt 5 is threadedly connected to the base plate 1, the outer walls of the opposite sides of the two limit plates 2 are fixedly connected to a support plate 3, the top of the support plate 3 is fixedly connected to an iron sheet 8, a dustproof mesh plate 9 is clamped and connected between the two limit plates 2, the top of the dustproof mesh plate 9 is fixedly connected to a strong magnet 10, and the strong magnet 10 is connected to the iron sheet 8 by suction.

[0028] In the technical solution of the utility model, if Figure 1 As shown, there are four powerful magnets 10, which are respectively located at the four corners of the top of the dustproof mesh plate 9; this is beneficial to improving the firmness of the installation of the dustproof mesh plate 9.

[0029] In the technical solution of the utility model, if Figure 2 and Figure 3 As shown, mounting holes 4 are provided at the four corners of the base plate 1 , which is beneficial to the installation of the base plate 1 .

[0030] In the technical solution of the utility model, if Figure 2 As shown, the notch of the mounting slot 6 is matched with the body of the circuit board 7 , which is beneficial to improving the stability of the installation of the circuit board 7 .

[0031] In the technical solution of the utility model, if Figure 3As shown, a through heat dissipation slot 14 is provided at the bottom end of the base plate 1, and a plurality of dustproof nets 12 and a plurality of heat sinks 13 are alternately arranged inside the heat dissipation slot 14; this is beneficial to the heat dissipation at the bottom of the circuit board 7 and improves the dustproof effect.

[0032] In the technical solution of the utility model, if Figure 1 As shown, the dustproof mesh plate 9 is an aluminum plate, which is beneficial to improving the corrosion resistance of the dustproof mesh plate 9.

[0033] In the technical solution of the utility model, if Figure 3 As shown, the bottom plate 1 is provided with threaded holes 11 matched with the bolts 5 , which is conducive to the rapid disassembly and assembly of the bolts 5 .

[0034] In this technical solution, when it is necessary to install the circuit board 7 of the dual-tube forward switching power supply, the circuit board 7 can be placed in the mounting groove 6 on the base plate 1, and then fixed by bolts 5. Thereafter, the dustproof mesh plate 9 is engaged between the two limit plates 2, and then pressed downward until the dustproof mesh plate 9 is supported on the top of the support plate 3. At this time, the strong magnet 10 and the iron sheet 8 are close to produce an attraction effect, thereby achieving the fixation of the dustproof mesh plate 9. When disassembling, the dustproof mesh plate 9 can be directly pulled up until the strong magnet 10 is separated from the iron sheet 8. Through the mutual cooperation of the above structures, the dustproof mesh plate 9 can be flexibly disassembled and assembled, which is convenient for disassembly and cleaning of the dustproof mesh plate 9.

[0035] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dual-tube forward switching power supply, characterized in that: The invention comprises a bottom plate (1), both sides of the top of the bottom plate (1) are fixedly connected to limit plates (2), a mounting groove (6) is provided on the top end surface of the bottom plate (1), the mounting groove (6) is located between the two limit plates (2), a circuit board (7) is installed on the bottom plate (1) based on the inside of the mounting groove (6), a bolt (5) is passed through the circuit board (7), the bolt (5) is threadedly connected to the bottom plate (1), the outer walls of the two limit plates (2) on one side opposite to each other are fixedly connected to a support plate (3), the top of the support plate (3) is fixedly connected to an iron sheet (8), a dustproof mesh plate (9) is snap-fitted and connected between the two limit plates (2), the top of the dustproof mesh plate (9) is fixedly connected to a strong magnet (10), and the strong magnet (10) is connected to the iron sheet (8) by suction.

2. A dual-transistor forward switching power supply according to claim 1, characterized in that: A total of four powerful magnets (10) are provided, and the four powerful magnets (10) are respectively located at the four corners of the top end of the dustproof mesh plate (9).

3. A dual-transistor forward switching power supply according to claim 1, characterized in that: The four corners of the bottom plate (1) are each provided with mounting holes (4).

4. A dual-transistor forward switching power supply according to claim 1, characterized in that: The notch of the installation slot (6) is adapted to the body of the circuit board (7).

5. A dual-transistor forward switching power supply according to claim 1, characterized in that: A through-type heat dissipation groove (14) is provided at the bottom end of the bottom plate (1), and a plurality of dustproof nets (12) and a plurality of heat dissipation fins (13) are alternately arranged inside the heat dissipation groove (14).

6. A dual-transistor forward switching power supply according to claim 1, characterized in that: The dustproof screen plate (9) is an aluminum plate.

7. A dual-transistor forward switching power supply according to claim 1, characterized in that: The bottom plate (1) is provided with a threaded hole (11) adapted to fit the bolt (5).

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