A protection circuit for a power filter

Abstract

The utility model discloses a kind of protection circuit for power filter, it is related to power filter technical field.The protection circuit for power filter, comprising: PCB substrate, power filter circuit and fuse protection circuit component, the power filter circuit and fuse protection circuit component are all installed on PCB substrate, the upper surface of the PCB substrate is equipped with connecting groove and wiring port, the wiring port is provided with two.The scheme adopts the mode of combination connection, fuse replacement, fuse fuse is pre-assembled into in shell, when needing to replace fuse protection circuit component, directly to fuse protection circuit component disassembly, so that fuse protection circuit component is disassembled from PCB substrate, when fuse protection circuit component and PCB substrate are assembled, simultaneously realize that fuse fuse is connected with wiring port, realize that fuse protection circuit component is connected in series on power filter circuit, and operation efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of power filter technology, specifically a protection circuit for power filters. Background Technology

[0002] A power filter is a filter circuit composed of capacitors, inductors, and resistors. Its function is to prevent electromagnetic interference generated by the equipment itself from entering the power line, and at the same time prevent interference on the power line from entering the equipment. It allows DC or 50Hz operating current to pass through, but does not allow higher frequency electromagnetic interference current to pass through. The power filter is bidirectional. It can prevent interference from the power grid from entering the equipment and causing adverse effects on the equipment, so that the equipment meets the requirements of conducted sensitivity, and it can also prevent electromagnetic interference inside the equipment from passing through.

[0003] In existing technologies, power filters, in circuit protection design, often use fuses connected in series in the input circuit to prevent accidents such as overheating and short circuits.

[0004] However, this type of fuse protection usually requires rewiring after the fuse blows. The wiring process usually involves steps such as wrapping, tightening, and screw fixing, which is quite cumbersome. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the shortcomings of the prior art, this utility model provides a protection circuit for power supply filters, which solves the problems mentioned above.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a protection circuit for a power supply filter, comprising:

[0009] PCB substrate, power filtering circuit and fuse protection circuit assembly;

[0010] The power filtering circuit and the fuse protection circuit are both mounted on the PCB substrate. The upper surface of the PCB substrate is provided with a connection groove and a wiring port, and there are two wiring ports.

[0011] The fuse protection circuit assembly includes a housing, a fuse installed inside the housing, and a connector installed inside the housing. The connector corresponds to and matches the connection slot, and the two ends of the fuse are matched and connected to two wiring ports.

[0012] Preferably, the outer shell includes a hollow outer frame with openings on the top and bottom sides, and a top cover is detachably connected to the top opening of the outer frame.

[0013] Preferably, the fuse is configured in an n-shape, and the lower sides of both ends of the fuse correspond to the positions of the two terminals respectively.

[0014] Preferably, the outer casing has through slots on both the left and right sides, and pressure blocks are movably inserted into the through slots. The insertion post is installed on the lower side of the two opposing sidewalls of the pressure blocks. The lower sidewall of the insertion post is provided with an anti-detachment protrusion. A support plate is provided on the upper inner side of the outer casing, and a support spring is connected between the support plate and the pressure blocks.

[0015] Preferably, the inner wall of the housing is provided with a bracket, which is connected to the outer wall of the fuse.

[0016] Preferably, the side wall of the pressing block facing outward is provided with friction texture.

[0017] (III) Beneficial Effects

[0018] This invention provides a protection circuit for a power supply filter, which has at least the following advantages compared with the prior art:

[0019] This solution uses a combined connection method for replacing fuses. The fuses are pre-assembled inside the casing. When it is necessary to replace the fuse protection circuit assembly, the fuse protection circuit assembly is directly disassembled, allowing it to be removed from the PCB substrate. When assembling the fuse protection circuit assembly back onto the PCB substrate, the fuse is simultaneously connected to the terminal, enabling the fuse protection circuit assembly to be connected in series with the power filter circuit, resulting in high operational efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model after removing the fuse protection circuit assembly;

[0022] Figure 3 This is a schematic diagram of the internal structure of the fuse protection circuit assembly of this utility model.

[0023] In the diagram: 1. PCB substrate; 2. Power filter circuit; 3. Connecting slot; 4. Wiring port; 5. Outer frame; 6. Top cover; 7. Pressure block; 8. Support plate; 9. Support spring; 10. Insertion post; 11. Bracket; 12. Fuse. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1:

[0026] Please see Figure 1-3 This utility model provides a technical solution: a protection circuit for a power filter, comprising: a PCB substrate 1, a power filter circuit 2, and a fuse protection circuit assembly;

[0027] The power filtering circuit 2 and the fuse protection circuit assembly are both mounted on the PCB substrate 1. The upper surface of the PCB substrate 1 is provided with a connection groove 3 and a wiring port 4. There are two wiring ports 4. The fuse protection circuit assembly includes a housing, a fuse 12 installed in the housing, and a plug post 10 installed in the housing. The plug post 10 corresponds to and matches the position of the connection groove 3. The two ends of the fuse 12 are matched and connected to the two wiring ports 4.

[0028] Analysis of the above content: When in use, the power filter circuit 2 selects the existing circuit composition structure and the existing connection method. The two terminals 4 are connected in series on the power filter circuit 2. After the fuse protection circuit component is connected to the two terminals 4, the fuse protection circuit component is connected in series with the power filter circuit 2.

[0029] As can be seen from the attached diagram, when a connection is required, the fuse protection circuit assembly is plugged into the connection slot 3 based on the plug post 10, and then connected to the two terminals 4 through the two ends of the fuse 12 to achieve the circuit connection.

[0030] Example 2:

[0031] Please see Figure 1-3 Based on Embodiment 1, this utility model provides a technical solution: the outer shell includes a hollow outer frame 5 with openings on the upper and lower sides, and a top cover 6 is detachably connected to the upper opening of the outer frame 5.

[0032] Analysis of the above content: The fit between the outer frame 5 and the top cover 6 allows the interior of the outer frame 5 to be seen from the top when the top cover 6 is disassembled, which facilitates maintenance.

[0033] Example 3:

[0034] Please see Figure 1-3Based on Embodiment 1, this utility model provides a technical solution: the fuse 12 is configured in an n-shape, and the lower sides of both ends of the fuse 12 correspond to the positions of the two terminals 4 respectively.

[0035] Analysis of the above content: Through the design of the fuse 12 with this shape, it can be directly inserted into the two terminal ports 4 when the fuse 12 is lowered.

[0036] Example 4:

[0037] Please see Figure 1-3 The present invention provides a technical solution based on Embodiment 1: through slots are provided on both the left and right sides of the outer shell, and pressure blocks 7 are movably inserted into the through slots. The insertion post 10 is installed on the lower side of the two opposing side walls of the pressure blocks 7. Anti-detachment protrusions are provided on the lower side of the side wall of the insertion post 10. A support plate 8 is provided on the upper side of the inner side of the outer shell, and a support spring 9 is connected between the support plate 8 and the pressure blocks 7.

[0038] Analysis of the above content: When the pressure blocks 7 are pinched from both sides, the two pressure blocks 7 are brought together, and the two plug-in posts 10 are also brought together. The support spring 9 is in a compressed state. At this time, the plug-in posts 10 can be inserted into the two connecting slots 3, and the protrusions are lowered to the lower side of the PCB substrate 1. Then, the pressure blocks 7 are released. Under the elastic force of the support spring 9, the pressure blocks 7 on both sides move away from each other, and the two plug-in posts 10 move away from each other, so that the protrusions are stuck on the lower side of the PCB substrate 1. In this way, the outer shell cannot be detached from the PCB substrate 1 by itself. At the same time, when the outer shell is installed, the two ends of the fuse 12 are inserted into the two wiring ports 4.

[0039] Example 5:

[0040] Please see Figure 1-3 Based on Embodiment 1, this utility model provides a technical solution: the inner wall of the outer shell is provided with a bracket 11, and the bracket 11 is connected to the outer wall of the fuse 12.

[0041] Analysis of the above content: The bracket 11 is designed to facilitate the stability of the fuse 12.

[0042] Example 6:

[0043] Please see Figure 1-3 This utility model provides a technical solution based on embodiment four: friction texture is provided on the side wall of the pressing block 7 facing outward.

[0044] Analysis of the above content: The friction texture makes it less likely for fingers to slip when pressing on the pressure block 7.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protection circuit for a power supply filter, characterized in that, include: PCB substrate (1), power filter circuit (2) and fuse protection circuit assembly; The power filtering circuit (2) and the fuse protection circuit assembly are both mounted on the PCB substrate (1). The upper surface of the PCB substrate (1) is provided with a connection groove (3) and a wiring port (4). There are two wiring ports (4). The fuse protection circuit assembly includes a housing, a fuse (12) installed inside the housing, and a plug (10) installed inside the housing. The plug (10) corresponds to and matches the connection slot (3). The two ends of the fuse (12) are matched and connected to two wiring ports (4).

2. The protection circuit for a power supply filter according to claim 1, characterized in that: The outer shell includes a hollow outer frame (5) with openings on the top and bottom sides, and a top cover (6) is detachably connected to the upper opening of the outer frame (5).

3. The protection circuit for a power supply filter according to claim 1, characterized in that: The fuse (12) is configured in an n-shape, and the lower sides of both ends of the fuse (12) correspond to the positions of the two terminals (4).

4. A protection circuit for a power supply filter according to claim 1, characterized in that: The outer shell has through slots on both the left and right sides, and pressure blocks (7) are movably inserted into the through slots. The insertion post (10) is installed on the lower side of the two opposing side walls of the pressure blocks (7). The lower side wall of the insertion post (10) is provided with an anti-detachment protrusion. The upper side of the inner side of the outer shell is provided with a support plate (8), and a support spring (9) is connected between the support plate (8) and the pressure block (7).

5. A protection circuit for a power supply filter according to claim 1, characterized in that: The inner wall of the housing is provided with a bracket (11), which is connected to the outer wall of the fuse (12).

6. A protection circuit for a power supply filter according to claim 4, characterized in that: The pressure block (7) has friction textures on the outer side wall.

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