A combined four-phase common-mode choke for filtering wide-band interference signals

Abstract

The utility model discloses a combined four-phase common mode inductor of filtering wideband interference signal, including base, nest structure, A common mode inductor, set in the B common mode inductor of nest structure, be provided with the through hole of the pin of the first coil of A common mode inductor in nest structure and pass through. Through with 2 common mode inductors utilize nest structure combination together and use, with the outgoing line of low frequency band common mode inductor passes through the magnetic ring of filtering high frequency interference, combination into the common mode inductor of filtering wideband interference signal, not only save space and respective production technology, also avoid 2 independent common mode inductors mutual magnetic field interference, improve filtering effect, also save the cost simultaneously.

Description

Technical Field

[0001] This utility model relates to a combined four-phase common-mode power supply for filtering wideband interference signals, and more particularly to a combined four-phase common-mode power supply for filtering wideband interference signals that is compact in structure, small in size, and has good filtering effect. Background Technology

[0002] Almost all power supply circuits generate common-mode and differential-mode electromagnetic interference signals. In order to prevent electronic devices from being interfered with by these common-mode and differential-mode electromagnetic interference signals and to ensure that the power supply meets the requirements of electromagnetic compatibility (EMC), common-mode filter inductors and differential-mode filter inductors are usually connected to reduce or suppress common-mode and differential-mode interference signals fed back to the input power grid. At the same time, noise from the power grid is not input to the internal power supply motherboard, so that the power supply meets the requirements of electromagnetic compatibility.

[0003] To address common-mode interference signals, conventional circuit designs typically employ single-stage and two-stage filtering circuits. Conducted interference frequencies range from 150kHz to 30MHz, while radiated interference frequencies exceed 30MHz. To filter out common-mode interference signals in these frequency bands, the circuit usually uses two independently designed common-mode inductors with different magnetic core materials. One inductor filters low-frequency interference, typically using high-permeability cores such as ferrite or nanocrystalline materials. The other inductor filters high-frequency interference (usually designed as a single-turn inductor), typically using low-permeability cores such as nickel-zinc. However, having two independent components occupies excessive PCB area, and the close proximity of the two common-mode inductors can lead to mutual magnetic field interference.

[0004] In view of the above, this utility model urgently needs to provide a combined four-phase common-mode circuit that filters out wideband interference signals to overcome the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a combined four-phase common-mode inductor for filtering wideband interference signals. It combines two common-mode inductors together, and uses the output wire of the low-frequency common-mode inductor to pass through the magnetic ring for filtering high-frequency interference to form a common-mode inductor for filtering wideband interference signals. This saves space and the production process of each inductor, improves the filtering effect, and saves costs.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a combined four-phase common-mode power supply for filtering wideband interference signals, the innovation of which is: the combined four-phase common-mode power supply for filtering wideband interference signals includes a base, a nested structure disposed on the base, an A common-mode inductor through which the nested structure passes and is installed on the base, and a B common-mode inductor disposed within the nested structure; The common-mode inductor A includes a first magnetic ring in the shape of a ring and a first coil wound on the first magnetic ring, with the nested structure passing through the core of the first magnetic ring; The nested structure includes a first part whose central axis is parallel to or coincides with the central axis of the first magnetic ring, a second part whose central axis coincides with the central axis of the first part, and a connecting part connecting the second part and the base. The first part passes through the first magnetic ring, and the second part is located in front of the first part and is farther away from the first magnetic ring than the first part. The second part is provided with a receiving cavity for the B common mode inductor to be placed, and the opening side of the receiving cavity is far away from the first magnetic ring. The nested structure is provided with through holes located in the core of the first part and the second part, with the central axis parallel to the central axis of the first part. The lead wire of the first coil of the A common mode inductor passes through the through holes. The B common-mode inductor includes a ring-shaped second magnetic ring and a second coil wound on the second magnetic ring.

[0007] Preferably, the first magnetic ring in the A common-mode inductor is a nanocrystalline magnetic ring; and the second magnetic ring in the B common-mode inductor is a nickel-zinc magnetic ring.

[0008] Preferably, the nanocrystalline magnetic ring is a T54*40*20 nanocrystalline magnetic ring; the nickel-zinc magnetic ring is a T29*19*7.7C nickel-zinc magnetic ring.

[0009] Preferably, the second part of the nested structure includes an outer ring that is fully encircled, an inner ring that is parallel to or coincides with the central axis of the outer ring and is located inside the outer ring, and a rear end that connects the inner ring and the outer ring and is in the shape of a ring. The rear end is close to the side of the A common mode inductor. The inner ring and the outer ring form the receiving cavity, and the core of the inner ring and the core of the first part constitute the through hole.

[0010] Preferably, the second part of the nested structure is provided with a plurality of partition plates located on the surface of the second part and distributed radially outward. The plurality of partition plates divide the first magnetic ring, which is directly opposite to the second part, into four regions for winding the first coil, forming four windings wound on the first magnetic ring. The lead wires of the four windings all pass through the through hole.

[0011] Preferably, the through holes in the nested structure are provided with grid plates that are distributed along the axial direction of the through holes and divide the through holes into four wire passages, and the lead wires of the four windings pass through the corresponding wire passages respectively.

[0012] Preferably, the second part of the sleeve structure is provided with four wire-passing grooves for the lead wires of the four windings to pass through respectively, and the lead wires of the four windings pass through four preset holes on the base respectively.

[0013] Preferably, the base is provided with a left limiting block and a right limiting block located on the left and right sides of the first magnetic ring, respectively, and the surfaces of the left limiting block and the right limiting block that contact the first magnetic ring are both inclined surfaces.

[0014] Preferably, the connecting portion provided on the nested structure is located at the end of the nested structure away from the first magnetic ring, and the connecting portion connects the second part and the base in a figure-eight shape; A support and limiting structure is provided between the end of the nested structure near the first magnetic ring and the base.

[0015] Preferably, the supporting and limiting structure is a horizontal connecting portion that is horizontally arranged along the second core portion of the nested structure and extends beyond the end face of the first magnetic ring; The base is provided with vertically distributed upright plates that abut against the bottom surface of the horizontal connecting part, and vertically distributed columns with hook-shaped parts at the top. The horizontal connecting part passes through the bottom of the hook-shaped parts, and the hook-shaped parts abut against the top surface of the horizontal connecting part.

[0016] The advantages of this utility model are as follows: This utility model combines two common-mode inductors into one unit using a nested structure. The lead wire of the low-frequency common-mode inductor passes through a magnetic ring that filters high-frequency interference, forming a common-mode inductor that filters broadband interference signals. This not only saves space and individual manufacturing processes, but also avoids magnetic field interference between the two independent common-mode inductors, improves the filtering effect, and saves costs. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a first-view perspective perspective of a combined four-phase common-mode circuit for filtering wideband interference signals according to this utility model (common-mode inductor B is omitted).

[0019] Figure 2 This is a front view of a combined four-phase common-mode circuit for filtering wideband interference signals according to the present invention, from a first-view perspective.

[0020] Figure 3 This is a first-view sectional view of a combined four-phase common-mode circuit for filtering wideband interference signals according to this utility model.

[0021] Figure 4 This is a left view from the first perspective of a combined four-phase common-mode circuit for filtering wideband interference signals according to this utility model.

[0022] Figure 5 This is a left sectional view from the first perspective of a combined four-phase common-mode circuit for filtering wideband interference signals according to this utility model.

[0023] Figure 6 This is a second-view perspective perspective of a combined four-phase common-mode circuit for filtering wideband interference signals according to this utility model.

[0024] Figure 7 This is a front view of a combined four-phase common-mode circuit for filtering wideband interference signals, as described in this utility model, from a second perspective.

[0025] Figure 8 This is a schematic diagram of a combined four-phase common-mode electrical nested structure (connection part omitted) for filtering wideband interference signals according to this utility model.

[0026] In the diagram: 1-base, 11-left limiting block, 12-right limiting block, 13-upper plate, 14-hook-shaped part, 15-post, 2-nested structure, 21-first part, 22-second part, 221-outer ring, 222-inner ring, 223-rear end, 224-partition plate, 23-connection part, 24-accommodating cavity, 25-through hole, 26-wire passage, 27-grid plate, 28-wire groove, 29-horizontal connection part, 3-A common mode inductor, 31-first magnetic ring, 32-first coil, 33-pin lead-out, 4-B common mode inductor. Detailed Implementation

[0027] This utility model discloses a combined four-phase common-mode inductor for filtering broadband interference signals, comprising a base 1, a nested structure 2 disposed on the base 1, an A common-mode inductor 3 through which the nested structure 2 passes and is mounted on the base 1, and a B common-mode inductor 4 disposed within the nested structure 2. The A common-mode inductor 3 comprises a first magnetic ring 31 in an annular shape and a first coil 32 wound on the first magnetic ring 31, with the nested structure 2 passing through the core of the first magnetic ring 31.

[0028] The nested structure 2 includes a first part 21 whose central axis is parallel to or coincides with the central axis of the first magnetic ring 31, a second part 22 whose central axis coincides with the central axis of the first part 21, and a connecting part 23 connecting the second part 22 and the base 1. The first part 21 passes through the first magnetic ring 31, and the second part 22 is located in front of the first part 21 and is farther away from the first magnetic ring 31 than the first part 21. The second part 22 is provided with a receiving cavity 24 for inserting the B common mode inductor 4. The opening side of the receiving cavity 24 is far away from the first magnetic ring 31. The nested structure 2 is provided with a through hole 25 located in the core of the first part 21 and the second part 22 and whose central axis is parallel to the central axis of the first part 21. The lead wire 33 of the first coil 32 of the A common mode inductor 3 passes through the through hole 25. The B common mode inductor 4 includes a ring-shaped second magnetic ring and a second coil (not shown in the diagram) wound on the second magnetic ring.

[0029] This invention combines two common-mode inductors using a nested structure 2. The lead wire of the low-frequency common-mode inductor passes through a magnetic ring that filters high-frequency interference, forming a common-mode inductor that filters wideband interference signals. This combination of two common-mode inductors using the nested structure 2 not only saves space and reduces the manufacturing process of each inductor, but also avoids magnetic field interference between the two independent common-mode inductors, improving the filtering effect and saving costs. One turn of common-mode inductor B 4 directly uses the tail wire of common-mode inductor A 3, passing through the inner ring 222 of the magnetic ring. The current direction is the same, the magnetic field is the same, and there is no interference between the magnetic fields of the two inductors. The combination of common-mode inductors A and B 4 reduces the installation volume, the number of components, reduces costs, and optimizes performance. This invention, using the above-mentioned combination structure, improves product compactness, reduces product size, and achieves a wideband common-mode inductor that filters both low and high frequencies.

[0030] In common-mode inductor A (3), the first magnetic ring 31 is a nanocrystalline magnetic ring, specifically a T54*40*20 nanocrystalline magnetic ring; in common-mode inductor B (4), the second magnetic ring is a nickel-zinc magnetic ring, specifically a T29*19*7.7C nickel-zinc magnetic ring. The nanocrystalline common-mode inductors are manufactured according to the design requirements for the number of turns, with a certain length reserved for the winding.

[0031] The second part 22 of the nested structure 2 of this utility model includes an outer ring 221 arranged in a continuous loop, an inner ring 222 parallel to or coincident with the central axis of the outer ring 221 and located inside the outer ring 221, and a rear end 223 connecting the inner ring 222 and the outer ring 221 and forming a ring shape, with the end close to the side of the A common mode inductor 3. The inner ring 222 and the outer ring 221 form a receiving cavity 24, and the core of the inner ring 222 and the core of the first part 21 form a through hole 25. The nested structure 2 separates the A common mode inductor 3 and the B common mode inductor 4, ensuring a certain electrical distance between the windings.

[0032] The second part 22 of the aforementioned nested structure 2 is provided with a plurality of partition plates 224 located on the surface of the second part 22 and distributed radially outward. The partition plates 224 divide the first magnetic ring 31, which is directly opposite to the second part 22, into four regions for winding the first coil 32, forming four windings wound on the first magnetic ring 31. The lead wires 33 of the four windings all pass through the through holes 25. The through holes 25 on the nested structure 2 are provided with grid plates 27 distributed axially along the through holes 25 and dividing the through holes 25 into four wire passage channels 26. The lead wires 33 of the four windings pass through the corresponding wire passage channels 26 respectively. The second part 22 of the nested structure is provided with four wire passage slots 28 for the lead wires 33 of the four windings to pass through respectively. The lead wires 33 of the four windings pass through four preset holes on the base 1 respectively. The nested structure 2 can both separate the 34 windings of common mode inductor A and prevent the 4 windings from contacting and crossing each other, and avoid the stress of the winding wires on common mode inductor B 4. The wire groove 28 is designed to separate the 4 pins 33 from each other.

[0033] In order to better limit the first magnetic ring 31, the base 1 of this utility model is provided with a left limiting block 11 and a right limiting block 12 located on the left and right sides of the first magnetic ring 31, respectively. The surfaces of the left limiting block 11 and the right limiting block 12 that contact the first magnetic ring 31 are both inclined surfaces.

[0034] The connecting portion 23 on the nested structure 2 of this utility model is located at the end of the nested structure 2 away from the first magnetic ring 31. The connecting portion 23 connects the second part 22 and the base 1 in a figure-eight shape. A support and limiting structure is provided between the end of the nested structure 2 near the first magnetic ring 31 and the base 1. The support and limiting structure is: a horizontal connecting portion 29 is horizontally arranged on the nested structure 2 along the core of the second part 22 and extends beyond the end face of the first magnetic ring 31; the base 1 is provided with vertically distributed upright plates 13 that abut against the bottom surface of the horizontal connecting portion 29 and vertically distributed columns 15 with hook-shaped portions 14 at the top. The horizontal connecting portion 29 passes under the hook-shaped portion 14, and the hook-shaped portion 14 abuts against the top surface of the horizontal connecting portion 29.

[0035] The lead wire 33 of the nanocrystalline common mode inductor of this invention passes through the nested structure 2 and through the inner ring 222 of the nickel-zinc common mode inductor to form a B common mode inductor 4, thereby realizing an A+B combined common mode inductor and a combined wideband common mode inductor that filters out low and high frequency interference signals.

[0036] The above are merely preferred embodiments of this utility model, and should not be construed as limiting the scope of this utility model. It should be noted that modifications or equivalent substitutions to the technical solutions of this utility model by those skilled in the art do not depart from the protection scope of this utility model.

Claims

1. A combined four-phase common-mode circuit for filtering broadband interference signals, characterized in that: The combined four-phase common-mode inductor for filtering broadband interference signals includes a base, a nested structure disposed on the base, an A common-mode inductor through which the nested structure passes and is mounted on the base, and a B common-mode inductor disposed within the nested structure. The common-mode inductor A includes a first magnetic ring in the shape of a ring and a first coil wound on the first magnetic ring, with the nested structure passing through the core of the first magnetic ring; The nested structure includes a first part whose central axis is parallel to or coincides with the central axis of the first magnetic ring, a second part whose central axis coincides with the central axis of the first part, and a connecting part connecting the second part and the base. The first part passes through the first magnetic ring, and the second part is located in front of the first part and is farther away from the first magnetic ring than the first part. The second part is provided with a receiving cavity for the B common mode inductor to be placed, and the opening side of the receiving cavity is far away from the first magnetic ring. The nested structure is provided with through holes located in the core of the first part and the second part, with the central axis parallel to the central axis of the first part. The lead wire of the first coil of the A common mode inductor passes through the through holes. The B common-mode inductor includes a ring-shaped second magnetic ring and a second coil wound on the second magnetic ring.

2. The combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 1, characterized in that: The first magnetic ring in the common-mode inductor A is a nanocrystalline magnetic ring; the second magnetic ring in the common-mode inductor B is a nickel-zinc magnetic ring.

3. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 2, characterized in that: The nanocrystalline magnetic ring is a T54*40*20 nanocrystalline magnetic ring; the nickel-zinc magnetic ring is a T29*19*7.7C nickel-zinc magnetic ring.

4. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 1, characterized in that: The second part of the nested structure includes an outer ring that is fully encircled, an inner ring that is parallel to or coincides with the central axis of the outer ring and is located inside the outer ring, and a rear end that connects the inner ring and the outer ring and is in the shape of a ring. The rear end is close to the side of the A common mode inductor. The inner ring and the outer ring form the receiving cavity. The core of the inner ring and the core of the first part constitute the through hole.

5. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 1, characterized in that: The second part of the nested structure is provided with a plurality of partition plates located on the surface of the second part and distributed radially outward. The plurality of partition plates divide the first magnetic ring, which is directly opposite to the second part, into four regions for winding the first coil, forming four windings wound on the first magnetic ring. The lead wires of the four windings all pass through the through hole.

6. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 5, characterized in that: The nested structure has a grid plate distributed along the through hole axis and dividing the through hole into 4 wire passages. The lead wires of the 4 windings pass through the corresponding wire passages respectively.

7. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 5, characterized in that: The second part of the sleeve structure is provided with four wire-passing grooves for the lead wires of the four windings to pass through respectively, and the lead wires of the four windings pass through four preset holes on the base respectively.

8. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 1, characterized in that: The base is provided with a left limiting block and a right limiting block located on the left and right sides of the first magnetic ring, respectively. The surfaces of the left limiting block and the right limiting block that contact the first magnetic ring are both inclined surfaces.

9. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 1, characterized in that: The connecting part provided on the nested structure is located at the end of the nested structure away from the first magnetic ring, and the connecting part connects the second part and the base in a figure-eight shape; A support and limiting structure is provided between the end of the nested structure near the first magnetic ring and the base.

10. A combined four-phase common-mode power supply for filtering wideband interference signals as described in claim 9, characterized in that: The supporting and limiting structure is a horizontal connecting part that is horizontally arranged along the second part of the core and extends beyond the end face of the first magnetic ring on the nested structure. The base is provided with vertically distributed upright plates that abut against the bottom surface of the horizontal connecting part, and vertically distributed columns with hook-shaped parts at the top. The horizontal connecting part passes through the bottom of the hook-shaped parts, and the hook-shaped parts abut against the top surface of the horizontal connecting part.

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