Filter inductor and power supply system with same

Abstract

The invention discloses a filter inductor, which relates to the technical field of inductance elements and comprises a magnetic ring and at least more than two windings wound on the magnetic ring, the windings are wound on the same magnetic ring, the number of turns and the phase are the same, and leakage inductance gaps are formed among the windings. The shell is arranged on the magnetic ring, the shell is arranged to be of a rotatable structure, on the basis, the bottom of the outer side wall of the shell is not higher than the bottom of the winding, and the outer side wall can completely wrap the leakage inductance gap. Compared with the prior art, the step and the structure for installing the magnetic shell below the magnetic ring are omitted, and therefore after the filter inductor is installed on the coil holder, adjustment of the differential mode inductor is facilitated, and adjustment of the differential mode inductor is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of inductor components, and in particular to a filtering inductor. Background Art

[0002] In the power supply system, the output voltage of the rectifier circuit is not pure DC. When observing the output of the rectifier circuit from an oscilloscope, it is very different from DC, and the waveform contains a large pulsating component, which is called ripple. In order to obtain a relatively ideal DC voltage, it is necessary to use a filter inductor composed of reactive elements with energy storage to filter out the pulsating components in the output voltage of the rectifier circuit to obtain a DC voltage.

[0003] Existing filter inductors such as Figure 1 As shown, it includes a toroidal magnetic core and a toroidal coil 2 wound around the left and right sides of the toroidal magnetic core 1, the upper cylinder 4 of the first magnetic core 3 and the lower cylinder 7 of the second magnetic core 6 are respectively arranged in the central window of the toroidal magnetic core 1, and the upper shell 5 of the first magnetic core 3 and the lower shell 8 of the second magnetic core 6 cooperate to surround the toroidal coil. When the existing filter circuit is powered on, the toroidal magnetic core 1 and the toroidal coils 2 on its left and right sides generate magnetic flux, but the toroidal coils 2 do not wind around the toroidal magnetic core 1 for one full circle, and there is a front gap H1 and a rear gap H2 between the two toroidal coils 2, which naturally causes magnetic flux "leakage". At this time, the upper shell 5 of the first magnetic core 3 and the lower shell 8 of the second magnetic core 6 cover the area of ​​the front gap H1 and the rear gap H2, and the "leaked" magnetic flux can form a differential mode inductance with the first magnetic core 3 and the second magnetic core 6. The size of the differential mode inductance is related to the size of the front and rear gaps (H1, H2) covered by the upper and lower shells (5, 8). The larger the coverage area, the larger the differential mode inductance, and vice versa.

[0004] Although the above scheme can adjust the size of the differential mode inductance, the filter inductor must be installed on the bobbin (the second magnetic core 6 of the filter inductor will be fixed on the bobbin), and the bobbin must be installed on the rigid circuit board (PCB), and the bobbin is electrically connected to the rigid circuit board (PCB) through pins. Therefore, the differential mode inductance of the filter inductor must be adjusted before installation, that is, the filter inductor must be powered on before installation to adjust the differential mode inductance. After the filter inductor is installed, it is difficult to adjust the differential mode inductance of the filter inductor when it is powered on for testing. Summary of the invention

[0005] One of the purposes of the present invention is to solve the problem in the prior art that the differential mode inductance of the filter inductor must be adjusted before the filter inductor is installed, which makes it inconvenient to adjust the differential mode inductance of the filter inductor.

[0006] A second object of the present invention is to provide a power supply system.

[0007] To achieve one of the above purposes, the present invention adopts the following technical solution: a filter inductor, including a magnetic ring and a winding wound on the magnetic ring, the number of windings is at least two or more, the windings are wound on the same magnetic ring, and the number of turns and phases are the same (winding in reverse).

[0008] A leakage inductance gap is formed between the windings, a window is provided at the center of the magnetic ring, and a magnetic column is provided in the window. The filter inductor also includes an inner shell and an outer shell. The filter inductor includes the magnetic ring, the inner shell and the outer shell from the inside to the outside. A joint head is provided at the center of the inner shell, and the joint head is connected to the magnetic column. Inner side walls are provided on both sides of the inner shell, and the inner side walls surround the windings on both sides of the magnetic ring.

[0009] Outer side walls are arranged on both sides of the shell, and the outer side walls surround the outside of the inner side walls, or the outer side walls surround the outside of the leakage inductance gap.

[0010] A fitting head is provided at the center of the shell, the fitting head is located above the joining head, and the fitting head is rotatably connected to the joining head.

[0011] The magnetic ring is made of high-conductivity ferrite material, the winding is a copper coil, the inner shell is made of plastic or ferromagnetic material (when the filter inductor needs to radiate electromagnetic waves outward, ferromagnetic materials cannot be used, so plastic materials are more suitable, and when it is necessary to shield the influence of the winding magnetic field on external electrons, or shield the influence of external electrons on the winding magnetic field, ferromagnetic materials are suitable), and the outer shell is made of ferromagnetic material.

[0012] The leakage inductance gap mentioned above is the front gap H1 and the rear gap H2 of the filter inductor in the prior art.

[0013] After the filter inductor is installed on the bobbin, the filter inductor is energized, and the leakage inductance gap between the windings wound on the same magnetic ring leaks magnetic flux. At this time, if the outer wall surrounds the inner wall, the outer wall is rotated by rotating the outer shell to cover the area of ​​the leakage inductance gap. The coverage area is selected according to the required size of the differential mode inductor (the larger the coverage area, the larger the differential mode inductance, and vice versa), and the required differential mode inductance can be obtained.

[0014] If the outer wall has surrounded the leakage inductance gap and covered the area of ​​the leakage inductance gap, then the required size of the differential mode inductance meets the requirements. If yes, the outer shell will not be rotated. If not, the outer shell will be rotated so that the outer wall covers a suitable area of ​​the leakage inductance gap to obtain the required differential mode inductance.

[0015] The beneficial effects of the present invention are: The present invention arranges the outer shell on the magnetic ring and arranges the outer shell into a rotatable structure. On this basis, the bottom of the outer wall of the outer shell is not higher than the bottom of the winding, and the outer wall can completely surround the leakage inductance gap. Compared with the prior art, the step and structure of installing the magnetic shell under the magnetic ring are omitted, so it is beneficial to adjust the differential mode inductance after the filter inductor is installed on the wire rack, and the adjustment of the differential mode inductance is more convenient.

[0016] In addition, the present invention fixes the inner shell on the magnetic ring, and the inner shell always surrounds the winding, so when it is necessary to shield the influence of the winding magnetic field on external electrons, or shield the influence of external electrons on the winding magnetic field, the inner shell can be made of ferromagnetic material, which is conducive to ensuring the stability of the winding magnetic field.

[0017] Furthermore, in an embodiment of the present invention, the filter inductor also includes a wire rack and a rigid circuit board, the magnetic ring is installed on the wire rack, a pin is provided under the wire rack, the lead of the winding is connected to the pin, and the pin is inserted into the connection hole of the rigid circuit board to achieve electrical connection.

[0018] Furthermore, in an embodiment of the present invention, a mounting platform is provided on the wire rack, and the magnetic ring is placed in the mounting platform.

[0019] Furthermore, in an embodiment of the present invention, a fixing groove and a receiving groove are provided at the bottom of the mounting platform, the fixing groove is lower than the receiving groove, the bottom height of the inner side wall is higher than the outer side wall, the bottom height of the outer side wall is not higher than the bottom height of the winding, the inner side wall is embedded in the fixing groove, and the outer side wall is located in the receiving groove.

[0020] Furthermore, in an embodiment of the present invention, a gap is left between the outer wall and the inner wall. When the outer wall surrounds the leakage inductance gap and covers the leakage inductance gap, better heat dissipation can be achieved through the gap left between the outer wall and the inner wall.

[0021] Furthermore, in an embodiment of the present invention, the magnetic column is coaxial with the window of the magnetic ring, and the bottom of the magnetic column is installed in the mounting platform of the wire rack.

[0022] Furthermore, in an embodiment of the present invention, the bottom of the bonding head has a sleeve, and the bonding head is sleeved on the top of the magnetic column through the sleeve. The bonding head and the magnetic column are connected by interference fit or threaded connection to achieve a fixed connection between the bonding head and the magnetic column.

[0023] Furthermore, in an embodiment of the present invention, the top of the mating head protrudes from the top surface of the housing to form a rotating head. The rotating head can be easily turned by a staff member to drive the housing to rotate, and finally the outer wall covers the leakage inductance gap to achieve the adjustment of the differential mode inductance.

[0024] Furthermore, in an embodiment of the present invention, the bottom of the engaging head has a rim, the engaging head is embedded in an opening provided at the top of the engaging head, and a sealing elastic ring is installed between the rim and the opening.

[0025] A slide groove is arranged on the outer side of the inner side wall, a downwardly protruding limit head is arranged on the top wall of the slide groove, a slide bar cooperating with the slide groove is arranged on the inner side of the outer side wall, and a limit opening cooperating with the limit head is arranged on the top of the slide bar.

[0026] The slide bar is slidably connected to the slide groove, and the limit head is embedded in the limit opening.

[0027] A gap is left between the bottom of the engaging head and the bottom of the top opening of the engaging head, and between the outer shell and the inner shell. The size of the gap is greater than the length of the limiting head protruding from the top wall of the slide groove.

[0028] Filter inductors are usually used in power cabinets. When air cooling or water cooling is set in the power cabinet, a motor is usually provided. When the motor is working, it will generate vibration. Frequent vibration can easily cause the outer shell to shift (rotate), resulting in changes in differential mode inductance. To solve this problem, a sealing elastic ring is set between the fitting head and the joint head, and a gap is left between the outer shell and the inner shell. On this basis, the slide bar fixed on the inner wall of the outer shell slides into the slide groove of the inner shell, and the top wall of the slide groove is provided with a limit head embedded in the limit mouth of the slide bar. Through this structure, when the filter inductor vibrates, the inner shell is fixed on the wire rack, and the limit head can prevent the slide bar and the outer shell from shifting (rotating). When the outer shell needs to be rotated, the rotating head of the outer shell is pressed to make the outer shell slightly downward, so that the limit mouth on the slide bar is separated from the limit head. At this time, the outer shell is rotated to cover an appropriate amount of leakage inductance gap area to obtain the required differential mode inductance. Then release the rotating head, so that the limit mouth on the slide bar is engaged with another limit head on the top wall of the slide groove under the action of the sealing elastic ring.

[0029] It should be noted that there are multiple limit heads arranged at intervals on the top wall of the slide groove, and the adjacent limit heads form an angle of any angle with the center of the magnetic ring, preferably 5°. That is to say, a limit opening on the slide bar needs to be rotated to another adjacent limit head of the limit head that cooperates with it, and the rotation angle needs to be rotated 5° (the first limit opening cooperates with the first limit head. When the outer shell rotates 5°, the first limit opening will be transferred to the second limit head, and the angle formed by the first limit head, the second limit head and the center of the magnetic ring is 5°).

[0030] In order to achieve the second of the above objectives, the present invention adopts the following technical solution: a power supply system, wherein the power supply system has the filter inductor described in one of the above objectives of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional schematic diagram of a filter inductor in the prior art.

[0032] Figure 2 It is a three-dimensional schematic diagram of a filter inductor according to an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of the structure of the filter inductor according to an embodiment of the present invention.

[0034] Figure 4 FIG. 4 is another schematic diagram of the structure of the filter inductor according to an embodiment of the present invention.

[0035] Figure 5 for Figure 4 A partial enlarged view of point A.

[0036] Figure 6 for Figure 4 A partial enlarged view of point B.

[0037] 1. annular magnetic core, 2. annular coil, 3. first magnetic core, 4. upper cylinder, 5. upper shell, 6. second magnetic core, 7. lower cylinder, 8. lower shell, H1, front gap, H2, and rear gap H2; 10. magnetic ring, 11. winding, 12. magnetic column; 20. inner shell, 21. joint head, 22. inner side wall, 23. slide groove, 24. limit head; 30. housing, 31. fitting head, 32. outer wall, 33. rotating head, 34. edge wrapping, 35. sealing elastic ring, 36. sliding strip; 40. Wire rack, 41. Mounting platform, 42. Fixing slot, 43. Accommodating slot, 44. Insertion pin; 50. Rigid circuit board. DETAILED DESCRIPTION

[0038] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] For the purpose of simplicity and illustration, the principles of the embodiments are described primarily by reference to examples. In the following description, many specific details are presented to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known power supply systems and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments may be used in combination with each other.

[0042] Example 1

[0043] It should be noted that the drawings in the specification are the contents of the specification. The structural shapes, connection relationships, matching relationships, and positional relationships that can be obtained without any doubt in the drawings in the specification should be understood as the contents of the specification.

[0044] A filter inductor, such as Figure 2 As shown, it includes a magnetic ring 10 and a winding 11 wound around the magnetic ring 10 . The number of the windings 11 is at least two. The windings 11 are wound around the same magnetic ring 10 , and the number of turns and phases are the same (winding in opposite directions).

[0045] like Figure 2 , Figure 3As shown, a leakage inductance gap is formed between the windings 11, a window is provided at the center of the magnetic ring 10, and a magnetic column 12 is provided in the window. The filter inductor also includes an inner shell 20 and an outer shell 30. The filter inductor includes the magnetic ring 10, the inner shell 20 and the outer shell 30 from the inside to the outside. A joint head 21 is provided at the center of the inner shell 20, and the joint head 21 is connected to the magnetic column 12. Inner side walls 22 are provided on both sides of the inner shell 20, and the inner side walls 22 surround the windings 11 on both sides of the magnetic ring 10.

[0046] Outer walls 32 are disposed on two sides of the housing 30 . The outer walls 32 surround the inner wall 22 , or surround the leakage inductor gap.

[0047] like Figure 3 As shown, a fitting head 31 is provided at the center of the housing 30 . The fitting head 31 is located above the joining head 21 . The fitting head 31 is rotatably connected to the joining head 21 .

[0048] The magnetic ring 10 is made of high-conductivity ferrite material, and the winding 11 is a copper coil. The inner shell 20 is made of plastic or ferromagnetic material (when the filter inductor needs to radiate electromagnetic waves outward, ferromagnetic materials cannot be used, so plastic materials are more suitable, and when it is necessary to shield the influence of the magnetic field of the winding 11 on external electrons, or shield the influence of external electrons on the magnetic field of the winding 11, ferromagnetic materials are suitable), and the outer shell 30 is made of ferromagnetic material.

[0049] The leakage inductance gap is the front gap H1 and the rear gap H2 of the filter inductor in the prior art (refer to Figure 1 ).

[0050] After the filter inductor is mounted on the bobbin 40, the filter inductor is energized, and magnetic flux leaks from the leakage inductance gap between the windings 11 wound on the same magnetic ring 10. At this time, if the outer wall 32 surrounds the outside of the inner wall 22, the outer wall 32 is rotated by rotating the housing 30 to cover the area of ​​the leakage inductance gap. The coverage area is selected according to the required size of the differential mode inductance (the larger the coverage area, the larger the differential mode inductance, and vice versa), and the required differential mode inductance can be obtained.

[0051] If the outer wall 32 has surrounded the leakage inductance gap and covered the area of ​​the leakage inductance gap, then the required size of the differential mode inductance meets the requirements. If yes, the housing 30 is not rotated. If not, the housing 30 is rotated so that the outer wall 32 covers a suitable area of ​​the leakage inductance gap to obtain the required differential mode inductance.

[0052] The advantage of the present invention is that the housing 30 is arranged on the magnetic ring 10, and the housing 30 is arranged to be a rotatable structure. On this basis, the bottom of the outer wall 32 of the housing 30 is not higher than the bottom of the winding 11, and the outer wall 32 can completely surround the leakage inductance gap. Compared with the prior art, the step and structure of installing the magnetic shell under the magnetic ring 10 are omitted, so it is beneficial to adjust the differential mode inductance after the filter inductor is installed on the wire rack 40, and the adjustment of the differential mode inductance is more convenient.

[0053] In addition, the present invention fixes the inner shell 20 on the magnetic ring 10, and the inner shell 20 always surrounds the winding 11, so when it is necessary to shield the influence of the magnetic field of the winding 11 on external electrons, or to shield the influence of external electrons on the magnetic field of the winding 11, the inner shell 20 can be made of ferromagnetic material, which is conducive to ensuring the stability of the magnetic field of the winding 11.

[0054] Specifically, Figure 3 As shown, the filter inductor also includes a wire rack 40 and a rigid circuit board 50. The magnetic ring 10 is installed on the wire rack 40. There is a pin 43 under the wire rack 40. The lead of the winding 11 is connected to the pin 43. The pin 43 is inserted into the connection hole of the rigid circuit board 50 to achieve electrical connection.

[0055] More specifically, a mounting platform 41 is provided on the wire rack 40 , and the magnetic ring 10 is placed in the mounting platform 41 .

[0056] More specifically, a fixing groove 42 and a receiving groove 43 are provided at the bottom of the mounting platform 41. The fixing groove 42 is lower than the receiving groove 43. The bottom height of the inner wall 22 is higher than the outer wall 32. The bottom height of the outer wall 32 is not higher than the bottom height of the winding 11. The inner wall 22 is embedded in the fixing groove 42, and the outer wall 32 is located in the receiving groove 43.

[0057] Specifically, a gap is left between the outer wall 32 and the inner wall 22. When the outer wall 32 surrounds the leakage inductance gap and covers the leakage inductance gap, the gap left between the outer wall 32 and the inner wall 22 can be used to better dissipate heat.

[0058] More specifically, the magnetic column 12 is coaxial with the window of the magnetic ring 10 , and the bottom of the magnetic column 12 is installed in the mounting platform 41 of the wire frame 40 .

[0059] More specifically, the bottom of the joint head 21 has a sleeve, and the joint head 21 is sleeved on the top of the magnetic column 12 through the sleeve. The joint head 21 and the magnetic column 12 are connected in an interference fit or threaded connection manner to achieve a fixed connection between the joint head 21 and the magnetic column 12.

[0060] Specifically, Figure 2 , Figure 3As shown, the top of the fitting head 31 protrudes from the top surface of the housing 30 to form a rotating head 33. The rotating head 33 can be easily turned manually by the staff to drive the housing 30 to rotate, and finally the outer wall 32 covers the leakage inductance gap to achieve the adjustment of the differential mode inductance.

[0061] More specifically, if Figure 4 , Figure 5 As shown, the bottom of the fitting head 31 has a rim 34 , and the fitting head 31 is embedded in an opening provided at the top of the joint head 21 , and a sealing elastic ring 35 is installed between the rim 34 and the opening.

[0062] like Figure 4 , Figure 6 As shown, a slide groove 23 is provided on the outer side of the inner side wall 22, a downwardly protruding limit head 24 is provided on the top wall of the slide groove 23, a slide bar 36 cooperating with the slide groove 23 is provided on the inner side of the outer side wall 32, and a limit opening cooperating with the limit head 24 is provided on the top of the slide bar 36.

[0063] The slide bar 36 is slidably connected to the slide groove 23, and the limit head 24 is embedded in the limit opening.

[0064] like Figure 4 As shown, a gap is left between the bottom of the engaging head 31 and the bottom of the top opening of the engaging head 21 , and between the outer shell 30 and the inner shell 20 , and the size of the gap is greater than the length of the limiting head 24 protruding from the top wall of the slide groove 23 .

[0065] Filter inductors are usually used in power cabinets. When air cooling or water cooling is set in the power cabinet, a motor is usually provided. The motor will generate vibration when working. Frequent vibrations can easily cause the housing 30 to shift (rotate), resulting in changes in differential mode inductance. To solve this problem, a sealing elastic ring 35 is set between the fitting head 31 and the joint head 21, and a gap is left between the housing 30 and the inner housing 20. On this basis, a slide bar 36 fixed on the inner wall of the housing 30 is slidably embedded in the slide groove 23 of the inner housing 20, and a limit head 24 is provided on the top wall of the slide groove 23 to embed the limit opening of the slide bar 36. With this structure, when the filter inductor vibrates, the inner shell 20 is fixed on the wire frame 40, and the limit head 24 can prevent the slide bar 36 and the outer shell 30 from deflecting (rotating). When the outer shell 30 needs to be rotated, the rotating head 33 of the outer shell 30 is pressed to make the outer shell 30 slightly downward, so that the limit opening on the slide bar 36 is separated from the limit head 24. At this time, the outer shell 30 is rotated to cover an appropriate amount of leakage inductance gap area to obtain the required differential mode inductance. Then the rotating head 33 is released, so that the limit opening on the slide bar 36 is engaged with another limit head 24 on the top wall of the slide groove 23 under the action of the sealing elastic ring 35.

[0066] It should be noted that there are multiple limit heads 24 spaced apart on the top wall of the slide groove 23, and the adjacent limit heads 24 form an angle of any angle with the center of the magnetic ring 10, preferably 5°. That is to say, a limit opening on the slide bar 36 needs to be rotated to another limit head 24 adjacent to the limit head 24 that cooperates with it, and the rotation angle needs to be rotated 5° (the first limit opening cooperates with the first limit head 24, and when the housing 30 rotates 5°, the first limit opening will be transferred to the second limit head 24, and the angle formed by the first limit head 24, the second limit head 24 and the center of the magnetic ring 10 is 5°).

[0067] Example 2

[0068] A power supply system comprises the filter inductor in the first embodiment.

[0069] Although the above describes the illustrative specific embodiments of the present invention so that those skilled in the art can understand the present invention, the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, all inventions and creations using the concepts of the present invention are protected.

Claims

1. A filter inductor, comprising a magnetic ring and a winding wound around the magnetic ring, wherein a leakage inductance gap is formed between the windings, a window is provided at the center of the magnetic ring, and a magnetic column is provided in the window, wherein: The filter inductor further comprises an inner shell and an outer shell. The filter inductor comprises the magnetic ring, the inner shell and the outer shell from the inside to the outside. A joint head is provided at the center of the inner shell, and the joint head is connected to the magnetic column. Inner side walls are provided on both sides of the inner shell, and the inner side walls surround the windings on both sides of the magnetic ring. The outer side walls are arranged on both sides of the shell, and the outer side walls surround the outside of the inner side walls, or the outer side walls surround the outside of the leakage inductance gap; A fitting head is provided at the center of the shell, the fitting head is located above the joining head, and the fitting head is rotatably connected to the joining head.

2. The filter inductor according to claim 1, characterized in that: The filter inductor also includes a wire frame and a rigid circuit board. The magnetic ring is installed on the wire frame. There is a pin under the wire frame. The lead wire of the winding is connected to the pin. The pin is inserted into the connection hole of the rigid circuit board to achieve electrical connection.

3. The filter inductor according to claim 2, characterized in that: A mounting platform is provided on the wire rack, and the magnetic ring is placed in the mounting platform.

4. The filter inductor according to claim 3, characterized in that: The bottom of the mounting platform is provided with a fixing groove and a receiving groove, the fixing groove is lower than the receiving groove, the bottom height of the inner side wall is higher than the outer side wall, the bottom height of the outer side wall is not higher than the bottom height of the winding, the inner side wall is embedded in the fixing groove, and the outer side wall is located in the receiving groove.

5. The filter inductor according to claim 1, characterized in that: A gap is left between the outer side wall and the inner side wall.

6. The filter inductor according to claim 3, characterized in that: The magnetic column is coaxial with the window of the magnetic ring, and the bottom of the magnetic column is installed in the mounting platform of the wire rack.

7. The filter inductor according to claim 6, characterized in that: The bottom of the joint head has a sleeve opening, and the joint head is sleeved on the top of the magnetic column through the sleeve opening. The joint head and the magnetic column are connected in an interference fit or threaded connection manner to achieve a fixed connection between the joint head and the magnetic column.

8. The filter inductor according to claim 1, characterized in that: The top end of the engaging head protrudes from the top surface of the shell to form a rotating head.

9. The filter inductor according to claim 8, characterized in that: The bottom of the fitting head has a rim, the fitting head is embedded in an opening provided at the top of the joint head, and a sealing elastic ring is installed between the rim and the opening; A slide groove is provided on the outer side of the inner side wall, a downwardly protruding limit head is provided on the top wall of the slide groove, a slide bar cooperating with the slide groove is provided on the inner side of the outer side wall, and a limit opening cooperating with the limit head is provided on the top of the slide bar; The slide bar is slidably connected to the slide groove, and the limit head is embedded in the limit opening; A gap is left between the bottom of the engaging head and the bottom of the top opening of the engaging head, and between the outer shell and the inner shell. The size of the gap is greater than the length of the limiting head protruding from the top wall of the slide groove.

10. A power supply system, characterized in that: The power supply system comprises the filter inductor as described in any one of claims 1 to 9.

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