Automobile Chassis Circuit SMD Common Mode Inductor

Abstract

The present invention relates to the technical field of common mode inductors, and discloses a surface-mounted common mode inductor for vehicle chassis circuits, including: a housing and a double-column magnetic core and an I-shaped magnetic core arranged inside the housing, and further including: terminals fixed above the housing, flat wires wound around both sides of the double-column magnetic core, and the wiring ends are located inside the terminals; a silica gel strip fixed inside the housing; the present invention controls the size of the air gap spacing through the magnetic field strength; when the flat wire is energized, a ring-shaped magnetic field is generated around the wire, and the magnetic field strength is concentrated at both ends of the magnetic core. The magnetic particles in the magnetic fluid will concentrate in the region with a stronger magnetic field and be driven by the magnetic force. The magnetic fluid pushes the movement of the magnetic piston, squeezes the hydraulic oil in the hydraulic region, and thus pushes the hydraulic push plate to squeeze the magnetic core through the hydraulic oil to reduce the air gap; the present invention has good heat dissipation, makes full use of the limited packaging space of customers, makes the product packaging small, has a large current and a high power, and effectively improves the use power of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of common mode inductors, and particularly to a surface mount common mode inductor for vehicle chassis circuits. Background Art

[0002] With the continuous development of automotive electronics technology, the complexity and requirements of vehicle circuits are also constantly increasing. During the operation of vehicle chassis circuits, electromagnetic interference is often encountered, especially the influence of high-frequency noise. To effectively suppress these interferences, common mode inductors are widely used in vehicle circuits. By providing an inductive effect in the current loop, common mode inductors can effectively filter out common mode noise signals. However, existing common mode inductors have certain limitations in design, especially in the design of magnetic cores. Current common mode inductors cannot effectively control the gap between the magnetic cores, which leads to the performance and stability of the inductor not being fully optimized, thus limiting its noise suppression effect in high-frequency circuits.

[0003] In the design of traditional common mode inductors, the air gap design of the magnetic core is often determined by fixed parameters, but this method cannot be precisely adjusted according to the requirements of different application scenarios. Especially for vehicle chassis circuits, due to the wide range of electromagnetic interference frequencies in the vehicle environment and the complex circuit operating conditions, traditional common mode inductors often cannot provide an ideal suppression effect. The control of the gap between the magnetic cores is one of the key factors affecting the performance of the inductor. Therefore, how to accurately control the air gap and ensure the optimal effect in high-frequency noise suppression has become an important technical problem in the design of current common mode inductors. Summary of the Invention

[0004] The present invention provides a surface mount common mode inductor for vehicle chassis circuits. When a large current passes through a flat wire, a circular magnetic field is generated around the wire, and magnetic particles in the magnetic fluid will concentrate in the region with a stronger magnetic field and be driven by the magnetic force, so as to realize that the magnetic fluid can push the movement of the magnetic piston, and further control the size of the magnetic core air gap through hydraulic oil.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A surface mount common mode inductor for vehicle chassis circuits, comprising: a housing, a double-column magnetic core and an I-shaped magnetic core arranged in the housing, and further comprising:

[0007] Terminals, fixed above the housing, flat wires, wound around both sides of the double-column magnetic core, and the connection ends are located in the terminals; silicone strips, fixed in the housing, for bonding the double-column magnetic core and the I-shaped magnetic core;

[0008] Magnetron, there are two of them. The two magnetrons are fixed on the outer shell and located at the inner bottom of the outer shell, and are used for storing magnetic fluid and hydraulic oil; a magnetic piston, which slides at both ends of the magnetron and is located inside the magnetron; a return spring, which is fixed at both ends of the magnetron and is located inside the magnetron, and is fixed on the magnetic piston for resetting the magnetic piston.

[0009] Hydraulic cylinders, which are fixed on both sides of the outer shell; a hydraulic push plate, which slides inside the hydraulic cylinders.

[0010] Adjusting taper rod, one end of which is rotatably arranged on the outer shell and the other end is rotatably arranged on the magnetron, and is used for adjusting the moving range of the magnetic piston inside the magnetron; adjusting sleeves, there are two on the inner side of the same magnetron and are located inside the return spring, and are used for restricting the displacement of the magnetic piston.

[0011] Radiating plates, which are fixed on both sides of the outer shell; radiating grooves, there are multiple of them, and the multiple radiating grooves are all opened on the radiating plates and are arranged in a matrix for dissipating heat inside the outer shell; opening and closing plates, there are multiple of them, and the multiple opening and closing plates all slide inside the radiating grooves for adjusting the opening degree of the openings of the radiating grooves; ammonia liquid boxes, which are fixed inside the outer shell and are located on both sides of the outer shell.

[0012] Furthermore, it further includes a magnetic auxiliary component, and the magnetic auxiliary component includes:

[0013] Limit convex rings, which are fixed inside the magnetron and are located at both ends of the magnetron; limit grooves, which are opened on one side of the magnetic piston close to the limit convex rings; first rubber strip grooves, which are opened on the outer side of the magnetic piston; first sealing rubber rings, which are fixed inside the first rubber strip grooves.

[0014] Furthermore, the magnetic auxiliary component further includes:

[0015] Limit plates, which are fixed inside the hydraulic cylinders; liquid expansion grooves, which are opened inside the hydraulic cylinders; second rubber strip grooves, which are opened on the outer side of the hydraulic push plate, and second sealing rubber rings, which are fixed inside the second rubber strip grooves;

[0016] Liquid distribution pipes, both ends of which are fixed on the magnetron; liquid collecting pipes, which are fixed on the liquid distribution pipes and are located inside the outer shell; conveying pipes, one end of which is fixed on the end of the liquid collecting pipe far from the liquid distribution pipe, and the other end is fixed on the hydraulic cylinder.

[0017] Furthermore, it further includes an adjustment auxiliary component, and the adjustment auxiliary component includes:

[0018] Hydraulic threaded pipes, one end of which is fixed inside the magnetron, the other end is screwed into the adjustment sleeve and is located at both ends of the magnetron; stabilizing plates, which are fixed on the adjustment sleeves; hexagonal rods, which are fixed on the adjusting taper rods; sliding cylinders, one end of which is slidably sleeved on the hexagonal rods and the other end slides on the stabilizing plates; adjusting gears, which are fixed on the sliding cylinders.

[0019] Furthermore, the adjustment auxiliary component further includes:

[0020] An external gear ring, fixed on the adjusting sleeve and meshing with the adjusting gear; a positioning ring, fixed on both sides of the external gear ring; a rubber sheet, fixed on the magnetic moving piston and located on the side of the magnetic moving piston away from the limiting convex ring.

[0021] Further, a magnetic flow region is provided at the middle position of the magnetic moving tube for storing magnetic fluid, and hydraulic regions are provided at both ends of the magnetic moving tube for storing hydraulic oil.

[0022] Further, it further includes a heat dissipation auxiliary component, and the heat dissipation auxiliary component includes:

[0023] An activity groove, opened in the heat dissipation plate and communicating with the heat dissipation slot; an activity spring, one end fixed in the activity groove and the other end fixed on the opening and closing plate; a pulling plate, fixed on the opening and closing plate; a displacement frame, fixed on the pulling plate.

[0024] Further, the heat dissipation auxiliary component further includes:

[0025] An air pressure tube, fixed above the ammonia liquid box and located on both sides of the ammonia liquid box; a pneumatic piston, sliding in the air pressure tube; a pushing rod, one end fixed above the pneumatic piston and the other end fixed on the displacement frame; heat dissipation fins, embedded in the heat dissipation plate; a gasification tube, one end fixed on the air pressure tube and the other end fixed on the heat dissipation fins.

[0026] Further, the heat dissipation auxiliary component further includes:

[0027] A liquid return tube, fixed above the ammonia liquid box and located on both sides of the ammonia liquid box; a return flow tube, one end fixed on the liquid return tube and the other end fixed on the heat dissipation fins; a liquid stop ring, fixed in the liquid return tube; a spring ring seat, fixed in the liquid return tube and located above the liquid stop ring; a liquid return spring, fixed on the spring ring seat; a floating valve ball, fixed on the liquid return spring and located above the liquid stop ring.

[0028] Further, a wiring installation groove is provided on the outer side of the housing and is adapted to the terminal, a hydraulic installation groove is provided on the outer side of the housing and is adapted to the hydraulic cylinder, a heat dissipation installation groove is provided on the outer side of the housing and is adapted to the heat dissipation plate, and an adjustment installation groove is provided on the outer side of the housing and is adapted to the adjustment taper rod.

[0029] The above solution of the present invention has at least the following beneficial effects:

[0030] The present invention controls the size of the air gap spacing through the intensity of the magnetic field; when a flat wire is energized, a circular magnetic field is generated around the wire, and the magnetic field intensity is concentrated at both ends of the magnetic core. The magnetic particles in the magnetic fluid will concentrate in the region with a stronger magnetic field and be driven by the magnetic force. The magnetic fluid pushes the moving piston to move, squeezing the hydraulic oil in the hydraulic area, and then pushing the hydraulic push plate to squeeze the magnetic core through the hydraulic oil to reduce the air gap; the present invention has good heat dissipation, makes full use of the limited packaging space of customers, makes the product packaging small, has a large current and high power, and effectively improves the use power of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic perspective view of the overall structure of the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention;

[0032] Figure 2 FIG. is a schematic perspective view of the magnetic moving tube of the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention;

[0033] Figure 3 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 2 Enlarged view at A;

[0034] Figure 4 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 2 Enlarged view at B;

[0035] Figure 5 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 2 Enlarged view at C;

[0036] Figure 6 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 2 Enlarged view at D;

[0037] Figure 7 FIG. is a schematic perspective view of the heat dissipation plate of the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention;

[0038] Figure 8 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 7 Enlarged view at E;

[0039] Figure 9 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 7 Enlarged view at F;

[0040] Figure 10 For the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention Figure 7Enlarged view at position G;

[0041] Figure 11 Schematic three-dimensional structure diagram of the silica gel strip of the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention;

[0042] Figure 12 Schematic three-dimensional structure diagram of the housing of the on-vehicle chassis circuit patch common-mode inductor provided by an embodiment of the present invention.

[0043] Explanation of reference numerals:

[0044] In the figure: 1, housing; 2, double-column magnetic core; 3, I-shaped magnetic core; 4, terminal; 5, flat wire; 6, silica gel strip; 7, magnetron; 8, magnetic piston; 9, return spring; 10, hydraulic cylinder; 11, hydraulic push plate; 12, adjusting taper rod; 13, adjusting sleeve; 14, heat dissipation plate; 15, heat dissipation groove; 16, opening and closing plate; 17, ammonia liquid box; 18, limiting convex ring; 19, limiting groove; 20, first rubber strip groove; 21, first sealing rubber ring; 22, limiting plate; 23, liquid expansion groove; 24, second rubber strip groove; 25, second sealing rubber ring; 26, liquid distribution pipe; 27, liquid collection pipe; 28, conveying pipe; 29, hydraulic threaded pipe; 30, stabilizing plate; 31, hexagonal rod; 32, sliding cylinder; 33, adjusting gear; 34, external tooth ring; 35, clamping ring; 36, rubber sheet; 37, magnetic flow region; 38, hydraulic region; 39, movable groove; 40, movable spring; 41, pulling plate; 42, displacement frame; 43, air pressure pipe; 44, pneumatic piston; 45, push rod; 46, heat dissipation fin; 47, gasification pipe; 48, liquid return pipe; 49, return pipe; 50, liquid stop ring; 51, spring ring seat; 52, liquid return spring; 53, floating valve ball; 54, wiring installation groove; 55, hydraulic installation groove; 56, heat dissipation installation groove; 57, adjusting installation groove. Detailed implementation manners

[0045] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0046] As Figures 1 to 12 shown, an embodiment of the present invention provides an on-vehicle chassis circuit patch common-mode inductor, including: a housing 1 and a double-column magnetic core 2 and an I-shaped magnetic core 3 disposed in the housing 1, and further including:

[0047] Terminal 4 is fixed above the housing 1. The flat wire 5 is wound around both sides of the double-column magnetic core 2, and the terminal ends are located inside the terminal 4. The silica gel strip 6 is fixed inside the housing 1 and is used to bond the double-column magnetic core 2 and the I-shaped magnetic core 3.

[0048] There are two magnetrons 7. The two magnetrons 7 are fixed on the housing 1 and are located at the inner bottom of the housing 1. They are used to store magnetic fluid and hydraulic oil. The magnetic piston 8 slides at both ends of the magnetron 7 and is located inside the magnetron 7. The return spring 9 is fixed at both ends of the magnetron 7 and is located inside the magnetron 7. It is fixed on the magnetic piston 8 and is used to reset the magnetic piston 8. There is a magnetic fluid region 37 at the middle position of the magnetron 7 for storing magnetic fluid, and there are hydraulic regions 38 at both ends of the magnetron 7 for storing hydraulic oil.

[0049] The hydraulic cylinder 10 is fixed on both sides of the housing 1. The hydraulic push plate 11 slides inside the hydraulic cylinder 10.

[0050] One end of the adjusting taper rod 12 is rotatably arranged on the housing 1, and the other end is rotatably arranged on the magnetron 7. It is used to adjust the moving range of the magnetic piston 8 inside the magnetron 7. There are two adjusting sleeves 13 on the inner side of the same magnetron 7 and they are located inside the return spring 9. They are used to limit the displacement of the magnetic piston 8.

[0051] The heat dissipation plates 14 are fixed on both sides of the housing 1. There are multiple heat dissipation grooves 15. The multiple heat dissipation grooves 15 are all opened on the heat dissipation plates 14 and are arranged in a matrix. They are used to dissipate heat inside the housing 1. There are multiple opening and closing plates 16. The multiple opening and closing plates 16 all slide inside the heat dissipation grooves 15 and are used to adjust the opening degree of the openings of the heat dissipation grooves 15. The ammonia liquid box 17 is fixed inside the housing 1 and is located on both sides of the housing 1.

[0052] There is a wiring installation groove 54 on the outer side of the housing 1, which is adapted to the terminal 4. There is a hydraulic installation groove 55 on the outer side of the housing 1, which is adapted to the hydraulic cylinder 10. There is a heat dissipation installation groove 56 on the outer side of the housing 1, which is adapted to the heat dissipation plate 14. There is an adjustment installation groove 57 on the outer side of the housing 1, which is adapted to the adjusting taper rod 12.

[0053] Specifically, the flat wire 5 is used to meet the requirements of high current. Compared with traditional round wires, the flat wire 5 has lower resistance and better thermal management performance, and can effectively reduce the power loss when current passes through. The flat wire 5 also has stronger anti-electromagnetic interference ability, can reduce noise in vehicle circuits, and ensure the stability and reliability of the electrical system.

[0054] Since the current fluctuates greatly in the vehicle environment, especially in the chassis circuit, there are high currents and instantaneous large currents. Using the flat wire 5 can effectively improve the current-carrying capacity and avoid overheating and current saturation phenomena.

[0055] The design of the flat wire 5 can reduce the size of the inductor, thereby providing greater current handling capacity in a limited space. Its structure can also effectively reduce electromagnetic interference while maintaining a high inductance value and a low DC resistance, improving the operating efficiency of the overall circuit. The combination of the common-mode inductor in the vehicle chassis circuit and the flat wire 5 can also help reduce current harmonics and the impact of high-frequency noise on other circuits, further enhancing the stability and durability of the vehicle electronic system.

[0056] The silicone strip 6 is used to fix the double-column core 2 and the I-shaped core 3, and at the same time, it can meet the reliability of vibration.

[0057] Magnetic fluid is stored inside the magnetic flow region 37, and hydraulic oil is stored inside the hydraulic region 38. The magnetic fluid and the hydraulic oil are separated by the magnetic piston 8. The hydraulic push plate 11 is used to push the double-column core 2 and the I-shaped core 3 to shorten the distance. The heat dissipation plate 14 and the heat dissipation groove 15 are used to dissipate heat inside the housing 1 to prevent the temperature inside the housing 1 from being too high.

[0058] The flat wire 5 is energized on the double-column core 2 and the I-shaped core 3, and the flat wire 5 has a large current, generating a strong magnetic field. This magnetic field can make the magnetic fluid flow towards the magnetic pole end. By attracting the magnetic fluid through this magnetic field, the magnetic piston 8 is pushed to move, further compressing the hydraulic region 38, and the hydraulic oil inside the hydraulic region 38 is discharged.

[0059] In the actual application process of this embodiment: The structure of the double-column core 2 and the I-shaped core 3 is adopted, combined with the mirror splicing process, and the appearance spraying treatment is carried out to achieve excellent appearance and durability. The high permeability of the double-column core 2 and the I-shaped core 3 is fully utilized to ensure that the electrical performance can meet the requirements of efficient current transmission and effectively reduce energy loss. The mirror splicing process not only ensures the precise docking of the cores but also improves their ability to resist electromagnetic interference, enhancing the overall performance of the inductor.

[0060] To meet the requirements of large current, the flat wire 5 is used as the conductor. Compared with the traditional round wire, the flat wire 5 can provide a larger conductive area in terms of structure, and has a lower resistance and better thermal management performance, thus ensuring that the inductor can operate stably in a high-current working environment while reducing power loss and temperature rise problems. The flat wire 5 also helps to reduce the electromagnetic radiation of the current, further improving the anti-interference performance.

[0061] The housing 1 is designed as an integrated terminal 4. The terminal 4 is closely attached to the housing 1 and connected through a planar pad, perfectly realizing the planar integration design of the terminal 4 and the housing 1, meeting the requirements of modern electrical equipment for space optimization and efficient connection. This design not only ensures the stability and reliability of electrical connection, but also enables the entire inductor to have higher anti-vibration ability and lower structural height, adapting to the limited space requirements of vehicle-mounted circuits.

[0062] The bottom plate firmly fixes the magnetic core through dotting silicone, ensuring that the double-column magnetic core 2 and the I-shaped magnetic core 3 are not affected by vibration during operation and maintaining stable electromagnetic performance. The pins and the housing 1 are connected by high-frequency welding technology and firmly fixed by bonding, ensuring the reliability and durability of the welding points. This structural design not only improves the vibration reliability of the inductor, but also ensures its stability during long-term operation. Even in the complex environment of vehicle-mounted systems, it can maintain efficient and stable electrical performance.

[0063] The present invention mainly makes full use of the magnetic core air gap in the magnetic core structure, as well as the flat coil winding structure with good heat dissipation and high automation. It makes full use of the limited packaging space of customers, making the product have a small package, large current and high power, effectively improving the use power of the product.

[0064] As a preferred embodiment of the present invention, it further includes a magnetic driving auxiliary component, and the magnetic driving auxiliary component includes:

[0065] Limit convex rings 18, fixed inside the magnetic driving tube 7 and located at both ends of the magnetic driving tube 7; limit grooves 19, opened on one side of the magnetic driving piston 8 close to the limit convex rings 18; first rubber strip grooves 20, opened on the outer side of the magnetic driving piston 8; first sealing rubber rings 21, fixed in the first rubber strip grooves 20.

[0066] The magnetic driving auxiliary component further includes: a limit plate 22, fixed inside the hydraulic cylinder 10; an expanded liquid groove 23, opened inside the hydraulic cylinder 10; a second rubber strip groove 24, opened on the outer side of the hydraulic push plate 11, and a second sealing rubber ring 25, fixed in the second rubber strip grooves 24;

[0067] A liquid separation tube 26, with both ends fixed on the magnetic driving tube 7; a liquid collection tube 27, fixed on the liquid separation tube 26 and located inside the housing 1; a delivery tube 28, with one end fixed on the end of the liquid collection tube 27 far from the liquid separation tube 26 and the other end fixed on the hydraulic cylinder 10.

[0068] Specifically, the distance between the limiting convex ring 18 and the adjusting sleeve 13 is the movable range of the magnetic piston 8. The liquid distribution pipe 26, the liquid collecting pipe 27 and the conveying pipe 28 can supply hydraulic oil into the hydraulic cylinder 10 and the hydraulic push plate 11. The hydraulic push plate 11 will correspondingly extend a certain length to squeeze the air gap between the double-column magnetic core 2 and the I-shaped magnetic core 3, so as to increase the magnetic flux density of the magnetic core and improve the total inductance value of the inductor. By reducing the air gap, the saturation current capacity of the magnetic core is improved. Squeezing the air gap helps to improve the coupling effect between the magnetic cores and ensure that the magnetic flux is more evenly distributed in the magnetic cores. The smaller the air gap, the less likely the magnetic core is to enter the saturation state during high-current operation, thus ensuring the stability of the inductor in a high-current environment and avoiding the sudden drop of the inductance value due to magnetic core saturation.

[0069] In the actual application process of this embodiment: The magnetic fluid has a certain magnetism and has a certain range of influence on the normal operation of the common-mode inductor. In order to avoid affecting the normal operation of the common-mode inductor, the following selection is made for the magnetic fluid:

[0070] The magnetic fluid is composed of magnetic particles and a silicone oil base liquid. The volume concentration range of the magnetic particles is 6% to 8%. The selected particle size of the magnetic particles is between 100nm and 300nm to ensure that it is small enough to avoid interfering with the internal magnetic field of the inductor, while ensuring the fluidity and stability of the fluid. The relative magnetic permeability (μr) of the magnetic fluid ranges from 800 to 900, with a low magnetic response to avoid affecting the magnetic field distribution of the magnetic core during the operation of the inductor. Its saturation magnetization intensity is controlled below 0.1T to ensure that the fluid does not enter the magnetic saturation state under the action of an external magnetic field, thus avoiding affecting the performance of the inductor. The magnetization intensity (M) is maintained below 10²A / m. Such an intensity ensures that the magnetic response of the magnetic fluid does not cause excessive disturbance to the operating state of the inductor. The viscosity of the magnetic fluid is set between 1 and 10 cP to ensure its good fluidity and avoid generating excessive resistance inside the inductor. The temperature adaptation range is 200°C to 300°C to ensure that the magnetic fluid can still maintain stable performance in a high-temperature environment and avoid the performance decline or instability of the fluid caused by temperature changes.

[0071] The magnetic fluid can push the magnetic piston 8 to move as follows:

[0072] When an electric current passes through the flat wire 5, a circular magnetic field is generated around the wire. This magnetic field is conducted to the double-column magnetic core 2 and the I-shaped magnetic core 3, and a strong magnetic field is formed at both ends of the magnetic core and around the current path. The magnetic field intensity is concentrated at both ends of the magnetic core, forming a strong magnetic field region. Under the action of this strong magnetic field, the fine magnetic particles in the magnetic fluid will respond to the magnetic field change and rearrange along the magnetic field lines, generating a macroscopic magnetic response. The magnetic particles in the magnetic fluid will concentrate in the region with a stronger magnetic field and be driven by the magnetic force to flow in the direction of a larger magnetic field intensity. As the magnetic field generated by the current acts on the magnetic fluid in the straight pipe, the magnetic particles in the fluid are affected by the force in the magnetic field and gradually migrate to the region with a stronger magnetic field, thereby enabling the magnetic fluid to push the magnetic piston 8 to move.

[0073] When the current is small, the generated magnetic field is weak, the degree of arrangement of the magnetic particles in the magnetic fluid is low, the driving effect of the magnetic field on the particles is small, the force pushing the magnetic piston 8 to generate displacement is small, and the return spring 9 can resist the pushing effect. When the current is large, the magnetic field generated by the current becomes stronger, the magnetic particles in the magnetic fluid will more significantly respond to the change of the external magnetic field. Under the action of the strong magnetic field, the degree of rearrangement of the particles in the magnetic fluid increases, the migration speed of the particles also increases accordingly, the acting force pushing the magnetic piston 8 is large, and the return spring 9 can be compressed.

[0074] As a preferred embodiment of the present invention, it further includes an adjustment auxiliary component, and the adjustment auxiliary component includes:

[0075] A hydraulic threaded pipe 29, one end of which is fixed inside the magnetic moving pipe 7, the other end is screwed into the adjustment sleeve 13 and is located at both ends of the magnetic moving pipe 7; a stabilizing plate 30, fixed on the adjustment sleeve 13; a hexagonal rod 31, fixed on the adjustment cone rod 12; a sliding cylinder 32, one end of which is slidably sleeved on the hexagonal rod 31, and the other end slides on the stabilizing plate 30; an adjustment gear 33, fixed on the sliding cylinder 32.

[0076] The adjustment auxiliary component further includes: an external toothed ring 34, fixed on the adjustment sleeve 13 and meshing with the adjustment gear 33; a clamping ring 35, fixed on both sides of the external toothed ring 34; a rubber sheet 36, fixed on the magnetic piston 8 and located on the side of the magnetic piston 8 away from the limit convex ring 18.

[0077] Specifically, by rotating the adjustment gear 33, it drives the rotation of the external toothed ring 34 and the adjustment sleeve 13, so that the adjustment sleeve 13 is in a working state of screwing in or out on the hydraulic threaded pipe 29, thereby achieving an increase or decrease in the distance between the limit convex ring 18 and the adjustment sleeve 13, adjusting the movable range of the magnetic piston 8 in the hydraulic region 38, further adjusting the amount of hydraulic oil discharged in the hydraulic region 38, and affecting the extended length of the hydraulic push plate 11.

[0078] As a preferred embodiment of the present invention, it further includes a secondary heat dissipation component, and the secondary heat dissipation component includes:

[0079] A movable slot 39 is opened in the heat dissipation plate 14 and is communicated with the heat dissipation slot 15; a movable spring 40 has one end fixed in the movable slot 39 and the other end fixed on the opening and closing plate 16; a pulling plate 41 is fixed on the opening and closing plate 16; and a displacement frame 42 is fixed on the pulling plate 41.

[0080] The secondary heat dissipation component further includes: a pneumatic tube 43 is fixed above the ammonia liquid box 17 and is located on both sides of the ammonia liquid box 17; a pneumatic piston 44 slides in the pneumatic tube 43; a push rod 45 has one end fixed above the pneumatic piston 44 and the other end fixed on the displacement frame 42; a heat dissipation fin 46 is embedded in the heat dissipation plate 14; and a gasification tube 47 has one end fixed on the pneumatic tube 43 and the other end fixed on the heat dissipation fin 46.

[0081] The secondary heat dissipation component further includes: a liquid return tube 48 is fixed above the ammonia liquid box 17 and is located on both sides of the ammonia liquid box 17; a reflux tube 49 has one end fixed on the liquid return tube 48 and the other end fixed on the heat dissipation fin 46; a liquid stop ring 50 is fixed in the liquid return tube 48; a spring ring seat 51 is fixed in the liquid return tube 48 and is located above the liquid stop ring 50; a liquid return spring 52 is fixed on the spring ring seat 51; and a floating valve ball 53 is fixed on the liquid return spring 52 and is located above the liquid stop ring 50.

[0082] Specifically, by installing the heat dissipation plate 14 in accordance with the installation direction of the common mode inductor, the ammonia liquid box 17, the pneumatic tube 43 and the liquid return tube 48 are always kept in an upward state during operation.

[0083] The working principle is to adopt the double-column magnetic core 2 and I-shaped magnetic core 3 structures, with mirror splicing and appearance spraying, making full use of the high magnetic conductivity of the magnetic core to meet the electrical performance requirements; the flat wire 5 can pass a large current; the silica gel strip 6 is firmly fixed to ensure that the double-column magnetic core 2 and I-shaped magnetic core 3 are not affected by vibration during operation and maintain stable electromagnetic performance. The shell 1 has a simple structure, and the air gap of the magnetic core is fully utilized in the magnetic core structure to increase the magnetic flux density of the magnetic core and improve the total inductance value of the inductor; the overall heat dissipation is good, and the flat coil winding structure has high automation; making full use of the limited packaging space of the customer, the product has a small package, a large current and a high power, effectively improving the service power of the product.

[0084] When a large current passes through the flat wire 5, an annular magnetic field is generated around the wire. Strong magnetic fields are formed at both ends of the magnetic core and around the current path. Utilizing the magnetic field formed by the flat wire 5, the fine magnetic particles in the magnetic fluid will rearrange along the magnetic field lines. The magnetic particles in the magnetic fluid will concentrate in the regions with stronger magnetic fields and be driven by the magnetic force, thus pushing the magneto-piston 8 towards the hydraulic region 38. The magneto-piston 8 squeezes the hydraulic oil in the hydraulic region 38, compresses the return spring 9, and the hydraulic oil enters the hydraulic cylinder 10 through the adjusting sleeve 13, hydraulic threaded pipe 29, liquid separation pipe 26, liquid collecting pipe 27 and delivery pipe 28. The hydraulic oil in the hydraulic cylinder 10 pushes the hydraulic push plate 11 out of the hydraulic cylinder 10, and the hydraulic push plate 11 squeezes the air gap between the double-column magnetic core 2 and the I-shaped magnetic core 3, reducing the distance of the air gap. The advantages of reducing the distance of the air gap are as follows:

[0085] Improve the inductance value. Reducing the size of the air gap can increase the magnetic flux density of the magnetic core and enhance the total inductance value of the inductor, effectively enhancing its filtering ability for high-frequency noise, thus improving electromagnetic compatibility and reducing electromagnetic interference; Enhance the magnetic field coupling effect. Squeezing the air gap helps to improve the coupling effect between the magnetic cores, ensuring a more uniform distribution of magnetic flux in the magnetic cores, improving the overall efficiency of the inductor and reducing energy loss caused by magnetic field leakage; Improve the saturation current capacity. By reducing the air gap, the saturation current capacity of the magnetic core is improved. The smaller the air gap, the less likely the magnetic core is to enter the saturation state when working at high currents, thus ensuring the stability of the inductor in a high-current environment and avoiding a sudden drop in the inductance value due to magnetic core saturation; Improve the temperature rise control. Reducing the air gap helps to improve the overall thermal management performance of the magnetic core, optimize the heat dissipation performance of the inductor, and reduce the temperature rise during operation; Enhance the anti-vibration and mechanical stability. By appropriately adjusting the air gap, the contact between the magnetic cores becomes closer, increasing the mechanical stability of the magnetic cores and avoiding performance degradation caused by vibration or shock in a vehicle-mounted environment; Optimize the high-frequency characteristics. Reducing the air gap can also improve the high-frequency response of the inductor, reduce signal distortion and attenuation at high frequencies, thus enhancing the performance of the inductor in high-frequency signal filtering and improving the stability and performance of the vehicle-mounted system.

[0086] As the current in the flat wire 5 increases, the magnetic field strength also increases, the magnetic force on the magnetic fluid increases, and thus the force with which the magnetic fluid pushes the magneto-piston 8 is increased; the magneto-piston 8 pushes a larger hydraulic region 38, and thus the force of squeezing the hydraulic oil is increased; after the initial force passes through the hydraulic region 38, liquid separation pipe 26, liquid collecting pipe 27, delivery pipe 28 and hydraulic cylinder 10, the hydraulic force is amplified, and finally the force exerted by the hydraulic push plate 11 is also enhanced, and the hydraulic push plate 11 can enhance the force of squeezing the double-column magnetic core 2 and the I-shaped magnetic core 3.

[0087] Insert the hexagon wrench into the hexagon hole of the adjusting cone rod 12. The rotation of the hexagon wrench drives the rotation of the adjusting cone rod 12. The rotation of the adjusting cone rod 12 drives the rotation of the hexagon rod 31. The rotation of the hexagon rod 31 drives the rotation of the sliding cylinder 32. The rotation of the sliding cylinder 32 drives the rotation of the adjusting gear 33. The rotation of the adjusting gear 33 drives the rotation of the external tooth ring 34. The rotation of the external tooth ring 34 drives the rotation of the adjusting sleeve 13. The rotation of the adjusting sleeve 13 makes a screwing-in or screwing-out movement on the hydraulic screw tube 29. The total length of the adjusting sleeve 13 and the adjusting sleeve 13 will elongate or shorten. By adjusting this length, the moving space of the magnetic piston 8 is restricted, so as to adjust the total amount of hydraulic oil discharged in the hydraulic area 38, and thus adjust the force of the hydraulic push plate 11 pressing the double-column magnetic core 2 and the I-shaped magnetic core 3.

[0088] When there is no current passing through the flat wire 5, the return spring 9 resets the magnetic piston 8. The hydraulic oil inside the hydraulic cylinder 10 will flow back into the hydraulic area 38. The magnetic piston 8 resets to the limit convex ring 18. The magnetic fluid re-converges together with the displacement of the magnetic piston 8.

[0089] The length of the hydraulic screw tube 29 finally limits the position of the magnetic piston 8, avoiding too small a gap between the double-column magnetic core 2 and the I-shaped magnetic core 3, resulting in a decrease in the saturation magnetic flux density. Too small a magnetic core gap leads to too high a magnetic flux density, exceeding the saturation point of the magnetic core, resulting in the magnetic core working in a saturated state. After saturation, the magnetic core cannot effectively store more magnetic energy, resulting in a decline in the performance of the inductor and affecting its normal operation; too small a gap leads to an increase in magnetic flux leakage, resulting in an increase in power loss of the system and a decrease in efficiency; too small a gap leads to unstable operation of the magnetic core and generates too much heat.

[0090] When the common-mode inductor is working, the temperature inside the inductor gradually rises. The ammonia liquid box 17 absorbs the internal heat. The liquid ammonia inside the ammonia liquid box 17 is converted into gaseous ammonia. The gaseous ammonia enters the pneumatic tube 43. The gaseous ammonia pushes the pneumatic piston 44 to move upward. The pneumatic piston 44 drives the push rod 45 to move. The push rod 45 drives the displacement frame 42. The displacement frame 42 drives the pulling plate 41. The pulling plate 41 drives the opening and closing plate 16 to move along the movable groove 39. The opening and closing plate 16 opens at the heat dissipation groove 15, facilitating the heat dissipation inside the common-mode inductor.

[0091] Control the opening and closing degree of the opening and closing plate 16 at the heat dissipation groove 15 through the change of the temperature inside the common-mode inductor for heat dissipation inside the common-mode inductor.

[0092] The height of the displacement of the pneumatic piston 44 exceeds the position of the carburetor tube 47 in the pneumatic tube 43. Gaseous ammonia enters the carburetor tube 47, and then enters the heat sink 46 from the carburetor tube 47. The heat sink 46 is located outside the common mode inductor. Heat is dissipated through the heat sink 46. At this time, the gaseous ammonia condenses into liquid ammonia. The liquid ammonia flows back into the return pipe 49, and then enters the liquid return pipe 48 from the return pipe 49. When there is enough liquid ammonia accumulated in the liquid return pipe 48, the floating valve ball 53 floats up and separates from the liquid stop ring 50. The liquid ammonia flows back into the ammonia liquid box 17 to achieve the purpose of heat dissipation.

[0093] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle described in the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. Chip common mode inductors for vehicle chassis circuits, including: The housing and the double-column magnetic core and the I-type magnetic core arranged in the housing are characterized by further comprising: The terminal is fixed on the upper part of the shell, and the flat wire is wound around the two sides of the double-column magnetic core, and the terminal is located inside the terminal; the silicone strip is fixed inside the shell and is used to bond the double-column magnetic core and the I-type magnetic core; There are two magneto-tubes, which are fixed on the housing and located at the bottom of the housing, and are used to store magnetic fluid and hydraulic oil; a magnetic piston slides on both ends of the magneto-tube and is located inside the magneto-tube; a reset spring is fixed on both ends of the magneto-tube and is located inside the magneto-tube and fixed to the magnetic piston, and is used to reset the magnetic piston; The hydraulic cylinder is fixed on both sides of the shell; the hydraulic push plate slides in the hydraulic cylinder; An adjusting cone rod, one end of which is rotatably arranged on the housing and the other end of which is rotatably arranged on the magnetotropic tube, is used to adjust the range of motion of the magnetotropic piston in the magnetotropic tube; two adjusting sleeves are arranged on the inner side of the same magnetotropic tube and are located in the reset spring, which are used to limit the displacement of the magnetotropic piston; A heat sink is fixed on both sides of the shell; there are multiple heat sinks, which are all opened on the heat sink and arranged in a matrix, for dissipating heat in the shell; there are multiple opening and closing plates, which are all slidable in the heat sink, for adjusting the opening degree of the heat sink opening; an ammonia liquid box is fixed in the shell and is located on both sides of the shell; It also includes a magnetic dynamic auxiliary component, which includes: The limiting convex ring is fixed in the magnetic tube and is located at both ends of the magnetic tube; the limiting groove is provided on the side of the magnetic piston close to the limiting convex ring; the first rubber strip groove is provided on the outer side of the magnetic piston; the first sealing rubber ring is fixed in the first rubber strip groove; The magnetic auxiliary component also includes: The limit plate is fixed on the inner side of the hydraulic cylinder; the expansion groove is provided in the hydraulic cylinder; the second rubber strip groove is provided on the outer side of the hydraulic push plate, and the second sealing rubber ring is fixed in the second rubber strip groove; The two ends of the liquid distributing tube are fixed on the magnetomotive tube; the liquid collecting tube is fixed on the liquid distributing tube and is located in the shell; the delivery tube has one end fixed on the end of the liquid collecting tube away from the liquid distributing tube and the other end fixed on the hydraulic cylinder; Also included is an auxiliary adjustment component, the auxiliary adjustment component comprising: The hydraulic threaded tube has one end fixed in the magnetic tube and the other end threaded into the adjusting sleeve and located at both ends of the magnetic tube; the stabilizing plate is fixed on the adjusting sleeve; the hexagonal rod is fixed on the adjusting cone rod; the slide tube has one end slidingly sleeved on the hexagonal rod and the other end sliding on the stabilizing plate; the adjusting gear is fixed on the slide tube.

2. The common-mode chip inductor for a vehicle chassis circuit according to claim 1, characterized in that: The auxiliary adjustment component also includes: The outer gear ring is fixed on the adjusting sleeve and meshes with the adjusting gear; the retaining ring is fixed on both sides of the outer gear ring; the rubber sheet is fixed on the magnetic piston and is located on the side of the magnetic piston away from the limiting convex ring.

3. The common-mode inductor of the vehicle chassis circuit according to claim 1, characterized in that: A magnetic flow area is provided at the middle of the magneto-tube for storing magnetic fluid, and hydraulic areas are provided at both ends of the magneto-tube for storing hydraulic oil.

4. The common-mode chip inductor for a vehicle chassis circuit according to claim 1, characterized in that: Also included is a heat dissipation auxiliary component, the heat dissipation auxiliary component comprising: The movable groove is arranged in the heat dissipation plate and communicated with the heat dissipation groove; one end of the movable spring is fixed in the movable groove and the other end is fixed on the opening and closing plate; the pulling plate is fixed on the opening and closing plate; and the displacement frame is fixed on the pulling plate.

5. The common-mode chip inductor for chassis circuit of vehicle according to claim 4, characterized in that: The heat dissipation auxiliary component also includes: The air pressure tube is fixed above the ammonia liquid box and is located on both sides of the ammonia liquid box; the pneumatic piston slides in the air pressure tube; the push rod has one end fixed above the pneumatic piston and the other end fixed on the displacement frame; the heat sink is embedded in the heat sink; the gas pipe has one end fixed on the air pressure tube and the other end fixed on the heat sink.

6. The common-mode chip inductor for chassis circuit of vehicle according to claim 5, characterized in that: The heat dissipation auxiliary component also includes: The liquid return pipe is fixed above the ammonia liquid box and located on both sides of the ammonia liquid box; the reflux pipe has one end fixed on the liquid return pipe and the other end fixed on the heat sink; the liquid stop ring is fixed in the liquid return pipe; the spring ring seat is fixed in the liquid return pipe and located above the liquid stop ring; the liquid return spring is fixed on the spring ring seat; the floating valve ball is fixed on the liquid return spring and located above the liquid stop ring.

7. The common-mode chip inductor for a vehicle chassis circuit according to claim 1, characterized in that: The outer side of the shell is provided with a wiring installation groove, which is compatible with the terminal. The outer side of the shell is provided with a hydraulic installation groove, which is compatible with the hydraulic cylinder. The outer side of the shell is provided with a heat dissipation installation groove, which is compatible with the heat dissipation plate. The outer side of the shell is provided with an adjustment installation groove, which is compatible with the adjustment cone rod.

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