Common mode filter

Abstract

The utility model provides a common mode filter, which comprises a framework and a pin fixedly arranged at the top end of the framework, the inner side of the framework is divided into two placing cavities by a partition plate, winding coils are wound in inner cavities of the placing cavities, the top end of each winding coil and the inner side of the pin are respectively provided with at least four groups of connecting parts, and the connecting parts are connected with the framework. Placing holes are formed in the four corners of the top end of the framework, and fixing parts are arranged in inner cavities of the placing holes. According to the utility model, the placing hole is arranged, a new pin installation position is reserved, a broken pin can be replaced to continue to work, the new pin can be fixed through the fixing part, deviation during use is avoided, and meanwhile, the first connecting line is bent and has good elasticity, so that the connection of the first connecting line cannot be always in a tight state, and the service life of the first connecting line is prolonged. And the phenomenon of disconnection is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of common mode filters, in particular to a common mode filter. Background Art

[0002] Common mode filters usually use ferrite cores, bifilar winding, low differential mode noise signal suppression interference source, difficult to deform in high-speed signals, good noise suppression countermeasures, high common mode noise suppression and low differential mode noise signal suppression. It is usually used in switching power supplies, data communication ports and other circuits to reduce electromagnetic interference.

[0003] At present, when the existing common-mode filter is in use, it is necessary to install the common-mode filter and the circuit components through pins. If the product falls from a height, it will vibrate the product, causing its pins to break or be damaged, thereby causing damage to the product. However, since the pins cannot be replaced, the entire common-mode filter needs to be replaced, increasing the cost of use. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a common mode filter to solve the problem that the existing common mode filter pins are broken or damaged and need to be replaced as a whole.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A common mode filter comprises a frame and a pin fixedly mounted on the top of the frame, wherein the inner side of the frame is divided into two placement cavities by a partition, a winding coil is wound around the inner cavity of the placement cavity, the top of the winding coil and the inner side of the pin are both provided with at least four groups of connection parts, placement holes are provided at the four corners of the top of the frame, and a fixing part is provided in the inner cavity of the placement hole.

[0007] The bottom end of the frame is plugged with an insert block, the inner side of the frame is an insulating area, and the partition is made of insulating material.

[0008] The connecting part includes a support column, the inner side of which is connected to the frame, a first connecting wire is sleeved on the surface of the support column, the inner side of the first connecting wire is connected to a second connecting wire, the bottom end of the second connecting wire is connected to the winding coil, and the outer side of the first connecting wire is connected to the pin.

[0009] The first connecting line is curved, and the supporting column is made of insulating and durable material.

[0010] The fixing part includes a fixing plate, which is located in the placement hole and connected to the inner cavity of the placement hole. A pull rod is provided on the outer side of the skeleton. The inner side of the pull rod extends to the inner cavity of the placement hole and is connected to a clamping block. The inner side of the clamping block is connected to a clamping strip. A tension spring is sleeved on the surface of the pull rod.

[0011] A clamping hole is provided on the surface of the fixing plate, and the clamping strip matches the clamping hole.

[0012] The clamping block is semi-cylindrical, the inner side of the tension spring is connected to the clamping block, and the outer side of the tension spring is connected to the inner cavity of the placement hole.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The common-mode filter provided by the utility model has a placement hole and a new pin installation position reserved, which can replace the broken pin to continue working; and the new pin can be fixed by the fixing part to avoid deviation during use. At the same time, the first connecting line is curved and has good elasticity, which will not cause the connection to be always in a tight state, thereby reducing the phenomenon of disconnection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the three-dimensional structure of the common mode filter;

[0016] Figure 2 is a schematic diagram of the connecting part structure;

[0017] Figure 3 It is a schematic diagram of the fixed part structure;

[0018] Figure 4 This is an enlarged structural diagram of the fixed plate.

[0019] [reference numerals]

[0020] 1. Skeleton; 2. Connecting part; 3. Pin; 4. Placement hole; 5. Fixing part; 6. Winding coil; 7. Partition; 8. Insert block; 21. Support column; 22. Second connecting line; 23. First connecting line; 51. Fixing plate; 52. Clip strip; 53. Tension spring; 54. Pull rod; 55. Clip block. DETAILED DESCRIPTION

[0021] The following is a detailed description of a common mode filter provided by the utility model in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the utility model.

[0022] like Figure 1As shown, a common mode filter comprises a skeleton 1 and a pin 3 fixedly mounted on the top of the skeleton 1, the inner side of the skeleton 1 is divided into two placement cavities by a partition 7; a winding coil 6 is wound around the inner cavity of the placement cavity, the top of the winding coil 6 and the inner side of the pin 3 are each provided with at least four groups of connecting parts 2, placement holes 4 are each provided at the four corners of the top of the skeleton 1, and a fixing part 5 is provided in the inner cavity of the placement hole 4.

[0023] By setting the placement hole 4, the placement position of the new pin 3 can be reserved in advance, which is convenient for subsequent use and reduces its use cost. At the same time, the inner circle of the placement hole 4 is larger than the outer circle of the pin 3; by setting the fixing part 5, the new pin 3 can be fixed and installed to avoid its movement during use, thereby causing its poor use effect.

[0024] like Figure 1 As shown, an insert block 8 is inserted into the bottom end of the frame 1, the inner side of the frame 1 is an insulating area, and the partition 7 is made of insulating material.

[0025] By setting the partition 7, two groups of winding coils 6 can be wound inside the frame 1, the purpose of which is to eliminate the "switching interference" unique to the switching power supply, thereby improving the use effect. At the same time, the partition 7 has good insulation performance to prevent signal attenuation during use.

[0026] like Figure 1 and Figure 2 As shown, the connecting part 2 includes a supporting column 21, the inner side of the supporting column 21 is connected to the frame 1, the surface of the supporting column 21 is sleeved with a first connecting wire 23, the inner side of the first connecting wire 23 is connected to a second connecting wire 22, the bottom end of the second connecting wire 22 is connected to the winding coil 6, and the outer side of the first connecting wire 23 is connected to the pin 3.

[0027] The purpose of setting the connecting part 2 is to connect the pin 3 with the winding coil 6 to suppress the common mode current while allowing the differential mode current to pass unimpeded, which can effectively reduce the noise generated by the switching power supply and improve the electromagnetic compatibility and anti-interference ability of the electronic equipment.

[0028] like Figure 1 and Figure 2 As shown, the first connecting line 23 is bent, and the supporting column 21 is made of insulating and durable material.

[0029] By setting the first connecting line 23, which is curved and has good elasticity, the first connecting line 23 can be stretched and retracted to extend its length, thereby preventing it from being in a tight state all the time, causing the connection to be disconnected when shaking or vibrating occurs. At the same time, it is easy to connect with the new pin 3 so that there will be no phenomenon such as insufficient distance.

[0030] like Figure 3 and Figure 4As shown, the fixing part 5 includes a fixing plate 51, which is located in the placement hole 4 and connected to the inner cavity of the placement hole 4. A pull rod 54 is provided on the outer side of the skeleton 1. The inner side of the pull rod 54 extends to the inner cavity of the placement hole 4 and is connected to a clamping block 55. The inner side of the clamping block 55 is connected to a clamping strip 52. A tension spring 53 is sleeved on the surface of the pull rod 54.

[0031] By setting a pull rod 54, the pull rod 54 is connected to the block 55, which can be connected by welding or plugging, so that the pull rod 54 moves under the action of an external force, driving the block 55 to move with the pull rod 54. At the same time, the pull rod 54 is made of metal material and has good firmness. By setting a fixing plate 51, the new pin 3 can be contacted to provide support force for the new pin 3. At the same time, it is made of metal material and has good toughness.

[0032] like Figure 3 and Figure 4 As shown, a clamping hole is provided on the surface of the fixing plate 51, and the clamping strip 52 matches the clamping hole.

[0033] By setting the card hole, the card strip 52 can be inserted to fix the new pin 3 and improve its stability. At the same time, the card block 55 can be in contact with the fixing plate 51 when not in use to prevent the pull rod 54 from extending and causing inconvenience in using the product.

[0034] like Figure 3 and Figure 4 As shown, the clamping block 55 is semi-cylindrical, the inner side of the tension spring 53 is connected to the clamping block 55 , and the outer side of the tension spring 53 is connected to the inner cavity of the placement hole 4 .

[0035] By setting the block 55 to be semi-cylindrical, the block 55 can be matched with the surface of the pin 3, thereby improving its fixing effect and avoiding the pin 3 from being unstable; by setting the tension spring 53, its purpose is to provide pulling force to the pull rod 54, so as to facilitate the pull rod 54 to reset.

[0036] When the common mode filter falls, the pin 3 vibrates, driving the first connecting line 23 to undergo elastic changes, so that the connection between the first connecting line 23 and the pin 3 will undergo elastic deformation following the vibration of the pin 3, thereby avoiding disconnection of the connection; when the pin 3 breaks, the pull rod 54 is pulled outward, during which the tension spring 53 is deformed, driving the block 55 to move outward, and a new pin 3 is inserted into the placement hole 4, the block 55 is reset to fix the new pin 3, and then the first connecting line 23 is pulled to connect with the new pin 3.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A common mode filter, characterized in that: The invention comprises a frame (1) and a pin (3) fixedly mounted on the top of the frame (1); the inner side of the frame (1) is divided into two placement cavities by a partition (7); a winding coil (6) is wound around the inner cavity of the placement cavity; the top of the winding coil (6) and the inner side of the pin (3) are both provided with at least four groups of connection parts (2); the four corners of the top of the frame (1) are each provided with a placement hole (4), and the inner cavity of the placement hole (4) is provided with a fixing part (5).

2. The common mode filter according to claim 1, characterized in that: An insert block (8) is inserted into the bottom end of the frame (1), the inner side of the frame (1) is an insulating area, and the partition (7) is made of insulating material.

3. The common mode filter according to claim 1, characterized in that: The connecting portion (2) comprises a support column (21), the inner side of the support column (21) is connected to the frame (1), and the surface of the support column (21) is sleeved with a first connecting wire (23); the inner side of the first connecting wire (23) is connected to a second connecting wire (22), the bottom end of the second connecting wire (22) is connected to the winding coil (6), and the outer side of the first connecting wire (23) is connected to the pin (3).

4. The common mode filter according to claim 3, characterized in that: The first connecting line (23) is in a curved shape, and the supporting column (21) is made of an insulating and durable material.

5. The common mode filter according to claim 1, characterized in that: The fixing portion (5) comprises a fixing plate (51), the fixing plate (51) is located in the placement hole (4) and connected to the inner cavity of the placement hole (4); a pull rod (54) is provided on the outer side of the frame (1), the inner side of the pull rod (54) extends to the inner cavity of the placement hole (4) and is connected to a clamping block (55); the inner side of the clamping block (55) is connected to a clamping strip (52), and a tension spring (53) is sleeved on the surface of the pull rod (54).

6. The common mode filter according to claim 5, characterized in that: A clamping hole is provided on the surface of the fixing plate (51), and the clamping strip (52) matches the clamping hole.

7. The common mode filter according to claim 5, characterized in that: The clamping block (55) is semi-cylindrical, the inner side of the tension spring (53) is connected to the clamping block (55), and the outer side of the tension spring (53) is connected to the inner cavity of the placement hole (4).

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