A direct current power supply filter

Abstract

The utility model relates to filter technical field, concretely is a kind of direct-current power supply filter, including equipment shell, the left side surface of equipment shell is equipped with the first installation slot, the inside fixed connection of first installation slot has output terminal, the right side of equipment shell is equipped with the second installation slot, the inside fixed connection of second installation slot has input terminal, the inside fixed connection of equipment shell has PCB board, the surface of PCB board is provided with filter module, filter module includes common mode choke coil and multilayer ceramic capacitor, common mode choke coil and multilayer ceramic capacitor are welded in the surface of PCB board;Common mode choke coil absorbs most differential mode and common mode noise, then remaining part is stored by multilayer ceramic capacitor again and is handled smoothly, finally output pure stable direct-current voltage is used to supply load, effectively improve filter efficiency while reducing equipment volume, it is convenient to still realize optimal filter performance under the condition of space limited.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, specifically to a DC power supply filter. Background Technology

[0002] Currently, DC power filters used in power electronic equipment are mainly used to eliminate voltage ripple and electromagnetic interference, and improve power efficiency and stability. With the rapid development of power electronics technology and industrial automation, the requirements for DC power filters are increasing. They are no longer limited to simple filtering functions, but also need to be miniaturized and energy-efficient. In recent years, in order to meet these needs, many new technologies have been introduced into the design of DC power filters, including but not limited to high-frequency switching technology and the application of new magnetic component materials. Currently, the commonly used DC power filters are mainly of three types: LC filter circuit, RC filter circuit, and LCπ-type filter circuit. Among them, the LC filter circuit is constructed by connecting an inductor L and a capacitor C in series, which can effectively suppress low-frequency harmonics, but it is large in size and expensive. The RC filter circuit is composed of a resistor R and a capacitor C. Although it is simple in structure and inexpensive, it has poor filtering effect on high-frequency signals. The LCπ-type filter combines the advantages of the former two and can achieve noise filtering over a wider frequency range, but the need to add an additional coupling inductor makes the whole device more complex.

[0003] Among them, existing DC power supply filters cannot achieve a balance between compact size and high performance; at the same time, their long-term operational stability needs to be improved, and they are prone to failure under extreme environmental conditions.

[0004] Therefore, it is necessary to invent a DC power supply filter to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a DC power filter to solve the problems of existing DC power filters being unable to balance compact size and high performance, while also having poor long-term operational stability and being prone to failure under extreme environmental conditions.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a DC power filter, comprising a device housing, a first mounting groove on the left side surface of the device housing, an output terminal fixedly connected inside the first mounting groove, a second mounting groove on the right side of the device housing, an input terminal fixedly connected inside the second mounting groove, a PCB board fixedly connected inside the device housing, and a filtering module disposed on the surface of the PCB board, the filtering module comprising a common-mode choke and a multilayer ceramic capacitor, the common-mode choke and the multilayer ceramic capacitor being soldered to the surface of the PCB board.

[0007] By adopting the above technical solution, the input terminal box output terminal is used to connect to external lines. The common mode choke and multilayer ceramic capacitor adopt a two-stage series synthesis filter path design. When the external AC power is converted into pulsating DC by the rectifier bridge and enters the filter, most of the differential mode and common mode noise is first absorbed by the common mode choke. Then the remaining part is stored and smoothed by the multilayer ceramic capacitor. Finally, a clean and stable DC voltage is output to supply the load. This effectively improves the filtering efficiency while reducing the size of the equipment, making it easy to achieve the best filtering performance even in space-constrained situations.

[0008] Optionally, four sets of connecting columns are fixedly connected to the inner bottom wall of the device housing, the PCB board is fixed to the upper end of the connecting columns, a heat-conducting sheet is provided on the lower surface of the PCB board, and the upper surface of the heat-conducting sheet is tightly abutted against the lower surface of the PCB board.

[0009] By adopting the above technical solution, a threaded hole is opened at the upper end of the connecting column, and the PCB board is fixed to the upper end of the connecting column by four sets of screws. At the same time, the heat-conducting sheet is in close contact with the heating element on the lower surface of the PCB board. During use, the heat-conducting sheet conducts heat to the surface of the PCB board.

[0010] Optionally, connecting plates are fixedly connected to both the left and right sides of the heat-conducting sheet, and collars are fixedly connected to both the front and rear ends of the connecting plates, with the collars fitted onto the surface of the connecting column.

[0011] By adopting the above technical solution, the stability of the heat-conducting sheet is improved through the cooperation of the collar and the connecting post.

[0012] Optionally, multiple sets of heat sinks are fixedly connected to both the front and rear surfaces of the heat-conducting sheet, and multiple sets of third mounting grooves are opened on both the front and rear surfaces of the device housing. The end of the heat sink away from the heat-conducting sheet extends through the third mounting groove to the outside of the device housing.

[0013] By adopting the above technical solution, the heat sink dissipates the heat generated during equipment operation, and the excess heat is carried away by natural air convection, maintaining the internal temperature rise of the equipment within a safe range, so that the equipment can operate efficiently.

[0014] Optionally, the left side surface of the device housing is fixedly connected to the first connecting block on both the front and rear sides of the output terminal.

[0015] By adopting the above technical solution, threaded holes are opened on the surface of both sets of first connecting blocks. The external line connectors are tightly connected to the output terminals by screws, which prevents the lines from falling off during operation and enhances the equipment's adaptability to bumpy environments. It is particularly suitable for use in field construction sites or on mobile platforms.

[0016] Optionally, two sets of second connecting blocks are fixedly connected to the lower ends of the front and rear surfaces of the device housing.

[0017] By adopting the above technical solution, the surface of the second connecting block is provided with a connecting hole, and the screw is connected to the terminal device by passing through the connecting hole.

[0018] Optionally, a support strip is fixedly connected to the inner wall of the device housing near the upper end, and a third connecting block is fixedly connected to the lower surface of the support strip at each of the four corners. A sealing cover plate is provided on the upper surface of the support strip.

[0019] By adopting the above technical solution, the sealing cover is used to seal the upper end of the equipment housing.

[0020] Optionally, an indicator light is fixedly connected to the front surface of the device housing.

[0021] By adopting the above technical solution, indicator lights are used to display the operating status of the equipment.

[0022] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. This utility model, when external AC power is converted into pulsating DC by a rectifier bridge and enters the filter, first absorbs most of the differential mode and common mode noise through a common mode choke, and then the remaining part is stored and smoothed by a multilayer ceramic capacitor, and finally outputs a pure and stable DC voltage to supply the load. This effectively improves the filtering efficiency while reducing the size of the equipment, and makes it easy to achieve the best filtering performance even in space-constrained situations. 2. This utility model uses a heat-conducting sheet that is in close contact with the lower surface of the PCB board to generate heat. During use, the heat-conducting sheet conducts heat to the surface of the PCB board, and the heat sink dissipates the heat generated during the operation of the equipment. Excess heat is carried away by natural air convection, maintaining the internal temperature rise of the equipment within a safe range, so that the equipment can operate efficiently. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall left side structure of this utility model; Figure 2 This is a schematic diagram of the overall right-side structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the equipment housing of this utility model; Figure 4 This is a schematic diagram of the external structure of the equipment housing of this utility model; Figure 5 This is a schematic diagram of the filter module structure of this utility model; Figure 6 This is a schematic diagram of the heat-conducting sheet structure of this utility model.

[0024] Explanation of reference numerals in the attached figures: 1. Equipment housing; 11. First mounting slot; 12. Output terminal; 13. Second mounting slot; 14. Input terminal; 15. First connecting block; 16. Second connecting block; 17. Indicator light; 18. Support bar; 19. Third connecting block; 110. Sealing cover plate; 111. Third mounting slot; 112. Connecting post; 2. PCB board; 21. Common mode choke; 22. Multilayer ceramic capacitor; 23. Heat-conducting sheet; 24. Connecting plate; 25. Collar; 26. Heat sink. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] This utility model provides, for example Figures 1 to 3 The DC power filter shown includes a housing 1. A first mounting groove 11 is formed on the left side surface of the housing 1. An output terminal 12 is fixedly connected inside the first mounting groove 11. First connecting blocks 15 are fixedly connected to both the front and rear sides of the output terminal 12 on the left side surface of the housing 1. A second mounting groove 13 is formed on the right side of the housing 1. An input terminal 14 is fixedly connected inside the second mounting groove 13. A PCB board 2 is fixedly connected inside the housing 1. A filtering module is provided on the surface of the PCB board 2. The filtering module includes a common-mode choke 21 and a multilayer ceramic capacitor 22. The common-mode choke 21 and the multilayer ceramic capacitor 22 are soldered to the surface of the PCB board 2.

[0027] The common-mode choke 21, multilayer ceramic capacitor 22, and PCB board 2 are located at the center of the equipment housing 1. The common-mode choke 21 is made of a high-performance ferrite core. The common-mode choke 21 is tightly wound with a diameter of about 10mm and a length of not less than 25mm to suppress common-mode noise. The multilayer ceramic capacitor 22 is divided into a high-voltage side and a low-voltage side, with a capacitance of 47μF±10% and a withstand voltage of up to 450Vdc. The PCB board 2 uses FR-4 epoxy resin glass fiber cloth-based copper foil cover plate, which has excellent electrical insulation performance and mechanical strength.

[0028] Specifically, during use, the common-mode choke 21 and the multilayer ceramic capacitor 22 adopt a two-stage series synthesis filter path design. When the external AC power is converted into pulsating DC by the rectifier bridge and enters the filter, most of the differential-mode and common-mode noise is first absorbed by the common-mode choke 21. Then, the remaining part is stored and smoothed by the multilayer ceramic capacitor 22, and finally outputs a pure and stable DC voltage to supply the load. This effectively improves the filtering efficiency while reducing the size of the equipment, making it easy to achieve the best filtering performance even in space-constrained situations.

[0029] See Figure 1 and Figure 4 Two sets of second connecting blocks 16 are fixedly connected to the lower ends of the front and rear surfaces of the equipment housing 1. A support strip 18 is fixedly connected to the upper end of the inner wall of the equipment housing 1. A third connecting block 19 is fixedly connected to the lower surface of the support strip 18 at the four corners. A sealing cover plate 110 is provided on the upper surface of the support strip 18. An indicator light 17 is fixedly connected to the front surface of the equipment housing 1.

[0030] In addition, the sealing cover plate 110 has through holes on its surface and the third connecting block 19 has threaded holes on its surface. The sealing cover plate 110 is placed on the upper surface of the support bar 18, and the screw is threaded through the through holes and connected to the third connecting block 19. The sealing cover plate 110 is fixed to the upper end of the equipment housing 1, which improves the internal sealing of the equipment housing 1 and facilitates its disassembly, thereby facilitating the maintenance of the internal equipment. At the same time, after the sealing cover plate 110 is fixed, there will be a certain gap between its edge and the inner wall of the equipment housing 1. For specific usage environments, such as dusty environments, glue can be injected into the gap for sealing during use, further improving the safety of equipment use.

[0031] See Figures 3 to 6 Four sets of connecting posts 112 are fixedly connected to the inner bottom wall of the equipment housing 1. The PCB board 2 is fixed to the upper end of the connecting posts 112. A heat-conducting plate 23 is provided on the lower surface of the PCB board 2. The upper surface of the heat-conducting plate 23 is tightly abutted by the lower surface of the PCB board 2. Connecting plates 24 are fixedly connected to both the left and right sides of the heat-conducting plate 23. A collar 25 is fixedly connected to both the front and rear ends of the connecting plate 24. The collar 25 is fitted onto the surface of the connecting posts 112. Multiple sets of heat sinks 26 are fixedly connected to both the front and rear surfaces of the heat-conducting plate 23. Multiple sets of third mounting grooves 111 are opened on both the front and rear surfaces of the equipment housing 1. The end of the heat sink 26 away from the heat-conducting plate 23 extends through the third mounting groove 111 to the outside of the equipment housing 1.

[0032] Meanwhile, through holes are provided at the four corners of PCB board 2, and threaded holes are provided at the upper end of connecting post 112. During the installation of PCB board 2, the heat sinks 26 on both sides of the heat conduction plate 23 are first inserted into the third mounting slots 111 on the front and rear sides. Then, four sets of collars 25 are put on the surface of connecting post 112, and the heat conduction plate 23 is fixed at the center of the four sets of connecting posts 112. Then, PCB board 2 is placed on the upper end of connecting post 112, and screws are used to thread the through holes at the four corners of PCB board 2 to the threaded holes at the upper end of connecting post 112, thus fixing PCB board 2 on the upper end of connecting post 112. When the components on the surface of PCB board 2 generate heat during use, the heat conduction plate 23 conducts the heat on the surface of PCB board 2 to the heat sinks 26 on both sides. The heat sinks 26 are made of aluminum alloy and the surface is anodized to enhance the thermal conductivity and effectively dissipate heat from PCB board 2, thereby improving the safety of equipment operation.

[0033] The working principle of this utility model is as follows: the common-mode choke 21 absorbs most of the differential-mode and common-mode noise, and then the remaining part is stored and smoothed by the multilayer ceramic capacitor 22, and finally outputs a pure and stable DC voltage to supply the load. This effectively improves the filtering efficiency while reducing the size of the equipment, making it easy to achieve the best filtering performance even in space-constrained conditions. At the same time, the heat generated during the operation of the equipment is dissipated by the heat-conducting plate 23 and the heat sink 26. The excess heat is carried away by natural air convection, keeping the internal temperature rise of the equipment within a safe range, so that the equipment can operate efficiently.

[0034] The foregoing has shown and described the basic principles, 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. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A DC power supply filter, comprising a device housing (1), characterized in that: The device housing (1) has a first mounting groove (11) on its left side surface, and an output terminal (12) is fixedly connected inside the first mounting groove (11). The device housing (1) has a second mounting groove (13) on its right side, and an input terminal (14) is fixedly connected inside the second mounting groove (13). The device housing (1) has a PCB board (2) fixedly connected inside, and a filter module is provided on the surface of the PCB board (2). The filter module includes a common mode choke (21) and a multilayer ceramic capacitor (22). The common mode choke (21) and the multilayer ceramic capacitor (22) are soldered to the surface of the PCB board (2).

2. A DC power supply filter according to claim 1, characterized in that: The inner bottom wall of the device housing (1) is fixedly connected with four sets of connecting columns (112). The PCB board (2) is fixed on the upper end of the connecting columns (112). A heat-conducting sheet (23) is provided on the lower surface of the PCB board (2). The upper surface of the heat-conducting sheet (23) is in close contact with the lower surface of the PCB board (2).

3. A DC power supply filter according to claim 2, characterized in that: The heat-conducting sheet (23) is fixedly connected to the left and right sides by a connecting plate (24), and the front and rear ends of the connecting plate (24) are fixedly connected to a collar (25), which is sleeved on the surface of the connecting column (112).

4. A DC power supply filter according to claim 3, characterized in that: Multiple sets of heat sinks (26) are fixedly connected to the front and rear surfaces of the heat-conducting plate (23). Multiple sets of third mounting grooves (111) are opened on the front and rear surfaces of the equipment housing (1). The end of the heat sink (26) away from the heat-conducting plate (23) extends through the third mounting groove (111) to the outside of the equipment housing (1).

5. A DC power supply filter according to claim 1, characterized in that: The left side surface of the device housing (1) is fixedly connected to the first connecting block (15) at the positions on both the front and rear sides of the output terminal (12).

6. A DC power supply filter according to claim 1, characterized in that: Two sets of second connecting blocks (16) are fixedly connected to the lower ends of the front and rear surfaces of the equipment housing (1).

7. A DC power supply filter according to claim 1, characterized in that: A support strip (18) is fixedly connected to the inner wall of the equipment housing (1) near the upper end. A third connecting block (19) is fixedly connected to the lower surface of the support strip (18) at the four corners. A sealing cover plate (110) is provided on the upper surface of the support strip (18).

8. A DC power supply filter according to claim 1, characterized in that: An indicator light (17) is fixedly connected to the front surface of the device housing (1).

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