SQ four-phase common-mode inductor and preparation method thereof

Abstract

The SQ four-phase common-mode inductor structurally comprises a bottom plate, a plurality of bottom plate hole sites are formed in the upper end of the bottom plate, a magnetic core used for winding coils is arranged above the bottom plate, a winding N1 / N2 coil and a winding N3 / N4 coil are wound on the two sides of the magnetic core respectively, and the winding N1 / N2 coil and the winding N3 / N4 coil are wound on the bottom plate hole sites. The winding N1 / N2 coil and the winding N3 / N4 coil are arranged in the magnetic core, electrode PINs of the winding N1 / N2 coil and the winding N3 / N4 coil correspond to hole positions of the bottom plate, the winding N1 / N2 coil, the winding N3 / N4 coil and the magnetic core are fixedly connected through adhesive glue, and the two windings are in independent phases. Through the multi-phase design, current distribution is more uniform, ripples and noise are reduced, the system stability is improved, and electromagnetic interference is effectively suppressed in a broadband range through special coil layout and a high saturation flux density material.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of inductors, in particular to an SQ four-phase common-mode inductor and a preparation method thereof. BACKGROUND

[0002] The existing common-mode inductor has many technical limitations: the traditional magnetic ring inductor relies on semi-automatic or manual winding, and the winding needs to be strictly guaranteed to be uniform and close, so that manual intervention is more, resulting in low efficiency and high cost, and the magnetic flux leakage is easily caused by non-tight winding or non-full winding, the leakage inductance is increased, and the electromagnetic interference is aggravated; in high-power applications, the magnetic ring inductor is easy to heat due to large current, and insufficient heat dissipation design will affect stability. In addition, the traditional magnetic ring structure has a small aperture, and the machine threading is difficult, so that the processing cost is high due to the dependence on manual work; the installation mode of the ring structure is fixed, the space is large, and when the pin design is unreasonable, the welding difficulty is high and the failure rate is high; the common-mode winding is close to the adjacent position, and an additional partition or a wire isolation is needed, which increases the cost and easily reduces the voltage resistance due to wire extrusion. These problems limit its application in high-precision control, high-speed data communication and other scenes, and improvement is urgently needed, therefore, the application provides an SQ four-phase common-mode inductor and a preparation method thereof. SUMMARY

[0003] The application aims to provide an SQ four-phase common-mode inductor and a preparation method thereof, which solves the problems in the background art.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: an SQ four-phase common-mode inductor, comprising a bottom plate, a plurality of bottom plate hole positions are formed in the upper end of the bottom plate, a magnetic core for winding a coil is arranged above the bottom plate, winding N1 / N2 coils and winding N3 / N4 coils are wound on the two sides of the magnetic core, respectively, and the electrodes PIN pins of the winding N1 / N2 coils and the winding N3 / N4 coils correspond to the bottom plate hole positions, the winding N1 / N2 coils, the winding N3 / N4 coils and the magnetic core are fixedly connected through adhesive, and the two windings are independent phases.

[0005] As a preferred embodiment of the application, the bottom plate is an epoxy plate, the number of the bottom plate hole positions is consistent with the number of the PIN pins of the winding N1 / N2 coils and the winding N3 / N4 coils, and the winding N1 / N2 coils and the winding N3 / N4 coils are attached to the bottom plate.

[0006] As a preferred embodiment of the application, the adhesive of the winding N1 / N2 coils and the winding N3 / N4 coils covers the contact area of the coils and the magnetic core, and does not overflow the outer edge of the magnetic core or exceed the height of the coils.

[0007] As a preferred embodiment of the present application, the winding N1 / N2 coil and the winding N3 / N4 coil both adopt Φ1.5*1P PEW wire.

[0008] As a preferred embodiment of the present application, the terminals of the winding N1 / N2 coil are 1-8 and 2-7, and the terminals of the winding N3 / N4 coil are 3-6 and 4-5.

[0009] The present application also provides a preparation method of the SQ four-phase common-mode inductor, comprising the following steps:

[0010] S1, winding coil: winding the winding N1 / N2 coil and the winding N3 / N4 coil on the magnetic core through a winding machine, ensuring the winding precision and the independence of the windings, and laying a foundation for realizing good high-low frequency suppression effect subsequently;

[0011] S2, coil electrode processing: after the winding N1 / N2 coil and the winding N3 / N4 coil are wound, the electrodes of the winding N1 / N2 coil and the winding N3 / N4 coil are stretched and shaped, then the PIN end is processed by laser stripping technology to remove the excess insulation layer, and then soldering operation is performed to improve the conductivity and connection reliability of the electrodes, and thus the performance stability of the connection part is ensured;

[0012] S3, adhesive fixing: the winding N1 / N2 coil and the winding N3 / N4 coil with the processed electrodes are inserted and assembled with the epoxy plate of the bottom plate, so that the components are preliminarily combined, and then the winding N1 / N2 coil, the winding N3 / N4 coil and the magnetic core are adhesively fixed, so as to ensure the stable position of the windings on the magnetic core and avoid affecting the inductance performance due to looseness;

[0013] S4, baking forming: after the adhesive fixing is completed, the whole assembly is subjected to temperature control baking treatment, appropriate temperature and time are set to make the adhesive fully cure, the connection between the winding N1 / N2 coil and the winding N3 / N4 coil and the magnetic core and the components is more firm, and finally the SQ four-phase common-mode inductor is formed.

[0014] As a preferred embodiment of the present application, in step S1, the number of winding turns of the winding N1 / N2 coil and the winding N3 / N4 coil is set to 5 turns.

[0015] As a preferred embodiment of the present application, in step S2, the laser stripping length of the winding N1 / N2 coil and the winding N3 / N4 coil is controlled to be 8.0 mm.

[0016] As a preferred embodiment of the present application, in step S4, the baking temperature of the temperature control baking treatment of the whole assembly is set to 120±10℃, and the baking time is set to 90 minutes.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows:

[0018] (1) Improve system stability: multi-phase design makes current distribution more uniform, reduces ripple and noise, and improves system stability.

[0019] (2) Enhance anti-interference ability: special coil layout and high saturation magnetic induction material effectively suppress electromagnetic interference in a wide frequency range.

[0020] (3) Optimize space utilization: small size, light weight, suitable for portable devices, easy to integrate, improve design flexibility.

[0021] (4) Improve current handling capacity: can withstand larger current, suitable for high-speed data communication and industrial automation fields.

[0022] (5) Reduce parasitic capacitance: small inter-turn parasitic capacitance, improve high-frequency filtering effect.

[0023] (6) Improve high-frequency performance: good high-frequency skin effect, smaller inductance volume and larger current density under the same filtering effect.

[0024] These effects make SQ four-phase inductors have significant advantages in circuit design, especially in scenarios requiring high-efficiency electromagnetic interference suppression and high-current handling capacity. BRIEF DESCRIPTION OF DRAWINGS

[0025] Other features, objects and advantages of the present application will become more apparent through reading the detailed description of the non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a whole view of SQ four-phase common-mode inductor and its preparation method of the present application;

[0027] Figure 2 It is a bottom plate top view of SQ four-phase common-mode inductor and its preparation method of the present application;

[0028] Figure 3 It is a bottom plate and magnetic core top view of SQ four-phase common-mode inductor and its preparation method of the present application;

[0029] Figure 4 It is a bottom plate and magnetic core side view of SQ four-phase common-mode inductor and its preparation method of the present application;

[0030] Figure 5 It is a product circuit diagram of SQ four-phase common-mode inductor and its preparation method of the present application;

[0031] Figure 6 It is a welding mainboard temperature curve diagram of SQ four-phase common-mode inductor and its preparation method of the present application.

[0032] In the figure: 101, bottom plate; 102, bottom plate hole; 103, magnetic core; 104, winding N1 / N2 coil; 105, winding N3 / N4 coil. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0035] Please refer to Figures 1-6 The present application provides a technical solution: a SQ four-phase common-mode inductor, comprising a bottom plate 101, a plurality of bottom plate holes 102 are formed in the upper end of the bottom plate 101, a magnetic core 103 for winding the coil is arranged above the bottom plate 101, winding N1 / N2 coil 104 and winding N3 / N4 coil 105 are wound on both sides of the magnetic core 103, respectively, and the electrodes PIN of the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 correspond to the bottom plate hole 102, the winding N1 / N2 coil 104, the winding N3 / N4 coil 105 and the magnetic core 103 are fixedly connected by adhesive, and the two windings are independent in phase.

[0036] In an optional embodiment, the bottom plate 101 is an epoxy plate, the number of bottom plate holes 102 is consistent with the number of PIN pins of the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105, and the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 are attached to the bottom plate 101.

[0037] It should be noted that the bottom plate 101 is an epoxy plate, the number of holes is consistent with the number of coil PIN pins and the coil is attached to the bottom plate 101, this design takes advantage of the excellent insulation and high temperature resistance of the epoxy plate to ensure that the PIN pins and the holes are accurately matched during assembly, reducing the contact failure caused by the gap; at the same time, the close attachment of the coil to the bottom plate 101 can reduce the overall volume and improve the space utilization.

[0038] In an optional embodiment, the adhesive of the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 covers the contact area between the coil and the magnetic core 103, and does not overflow the outer edge of the magnetic core 103 or exceed the height of the coil.

[0039] It should be noted that the adhesive covers the contact area between the coil and the magnetic core 103 and does not overflow. The design without overflow can avoid the glue pollution of the coil or the surface of the magnetic core 103 affecting the electrical performance, and further ensure the relative position stability of the coil and the magnetic core 103, and prevent the inductance parameter drift caused by looseness.

[0040] In an optional embodiment, the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 both use Φ1.5*1P PEW wire.

[0041] It should be noted that the coil uses Φ1.5*1P PEW wire, which has the characteristics of high temperature resistance and strong adhesion of the insulation layer, thereby reducing energy loss, and at the same time, the inter-turn parasitic capacitance is small, and the high-frequency filtering effect is improved.

[0042] In an optional embodiment, the terminals of the winding N1 / N2 coil 104 are 1-8 and 2-7, and the terminals of the winding N3 / N4 coil 105 are 3-6 and 4-5.

[0043] It should be noted that the independent phase layout ensures uniform distribution of four-phase current and avoids phase interference. The terminal corresponding relationship is clear, which is convenient for polarity identification during circuit connection, and cooperates with the 5-turn dense winding design, which can effectively suppress high and low frequency electromagnetic interference and improve the filtering effect.

[0044] The application also provides a preparation method of the SQ four-phase common-mode inductor.

[0045] S1, winding: winding the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 on the magnetic core 103 by a winding machine, ensuring the winding precision and the independence of the winding, laying a foundation for subsequent good high and low frequency suppression effect, and the number of turns of the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 is set to 5 turns;

[0046] S2, coil electrode processing: after the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 are wound, the electrodes of the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 are stretched and shaped, then the PIN end is processed by laser stripping technology, the excess insulation layer is removed, and then soldering operation is performed, improving the conductivity and connection reliability of the electrode, and further ensuring the performance stability of the connection part, and the laser stripping length of the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 is controlled to be 8.0 mm.

[0047] S3, bonding and fixing: the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 of the processed electrode are assembled with the epoxy plate of the bottom plate 101 by inserting PIN, and the winding N1 / N2 coil 104, the winding N3 / N4 coil 105 and the magnetic core 103 are bonded and fixed by using adhesive, so as to ensure the stable position of the winding on the magnetic core 103 and avoid affecting the inductance performance due to looseness;

[0048] S4, baking and forming: after the bonding and fixing is completed, the whole assembly is subjected to temperature control baking treatment, the adhesive is fully cured by setting appropriate temperature and time, the connection between the winding N1 / N2 coil 104 and the winding N3 / N4 coil 105 and the magnetic core 103 and the components is more firm, and finally the SQ four-phase common mode inductor is formed, the baking temperature of the whole assembly subjected to temperature control baking treatment is set to 120±10℃, and the baking time is set to 90 minutes.

[0049] Main structure and process characteristics of the product:

[0050] 1, coil winding structure:

[0051] WIDING PIN TURNS WIRE N1 1-8 5.0 Ts (REF) Φ 1.5 * 1 P (PEW) N2 2-7 5.0 Ts (REF) Φ 1.5 * 1 P (PEW) N3 3-6 5.0 Ts (REF) Φ 1.5 * 1 P (PEW) N4 4-5 5.0 Ts (REF) Φ 1.5 * 1 P (PEW)

[0052] 2, product electrical parameters:

[0053]

[0054] 3, main process flow and parameter requirements of the product:

[0055]

[0056]

[0057] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0058] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. An SQ four-phase common-mode inductor, comprising a base plate (101), characterized in that: The upper end of the base plate (101) is provided with a plurality of base plate holes (102). A magnetic core (103) for winding the coil is provided on the upper part of the base plate (101). The magnetic core (103) is wound with winding N1 / N2 coil (104) and winding N3 / N4 coil (105) on both sides respectively. The electrode pins of the winding N1 / N2 coil (104) and the winding N3 / N4 coil (105) correspond to the base plate holes (102). The winding N1 / N2 coil (104), winding N3 / N4 coil (105) and magnetic core (103) are fixedly connected by adhesive, and the two windings are independent phases.

2. The SQ four-phase common-mode inductor according to claim 1, characterized in that: The base plate (101) is an epoxy board, and the number of holes (102) on the base plate is the same as the number of pins of the winding N1 / N2 coil (104) and the winding N3 / N4 coil (105), and the winding N1 / N2 coil (104) and the winding N3 / N4 coil (105) are in contact with the base plate (101).

3. The SQ four-phase common-mode inductor according to claim 1, characterized in that: The adhesive used to bond the windings N1 / N2 (104) and N3 / N4 (105) to the magnetic core (103) covers the contact area between the coils and the magnetic core (103), without overflowing the outer edge of the magnetic core (103) or exceeding the coil height.

4. The SQ four-phase common-mode inductor according to claim 1, characterized in that: Both the windings N1 / N2 (104) and N3 / N4 (105) use Φ1.5*1P PEW wire.

5. An SQ four-phase common-mode inductor according to claim 1, characterized in that: The terminals of the winding N1 / N2 coil (104) are 1-8 and 2-7, and the terminals of the winding N3 / N4 coil (105) are 3-6 and 4-5.

6. A method for fabricating an SQ four-phase common-mode inductor according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Winding coils: The winding machine winds the N1 / N2 coil (104) and the N3 / N4 coil (105) on the magnetic core (103) respectively to ensure the winding accuracy and the independence of the windings, laying the foundation for achieving good high and low frequency suppression effect in the future. S2. Coil electrode treatment: After the windings N1 / N2 coil (104) and N3 / N4 coil (105) are wound, the electrodes of the windings N1 / N2 coil (104) and N3 / N4 coil (105) are stretched and shaped. Then, the PIN ends are treated with laser stripping technology to remove excess insulation layer. Then, soldering is performed to improve the conductivity and connection reliability of the electrodes, thereby ensuring the stable performance of the connection part. S3. Bonding and fixing: The N1 / N2 coil (104) and N3 / N4 coil (105) with the processed electrodes are assembled with the epoxy board of the base plate (101) by inserting pins to make the components initially assembled. Then, the N1 / N2 coil (104) and N3 / N4 coil (105) are bonded and fixed to the magnetic core (103) with adhesive to ensure that the position of each winding on the magnetic core (103) is stable and to avoid affecting the inductance performance due to loosening. S4. Baking and molding: After bonding and fixing, the entire component is subjected to temperature-controlled baking. By setting appropriate temperature and time, the adhesive is fully cured, making the connection between the winding N1 / N2 coil (104) and the winding N3 / N4 coil (105) and the magnetic core (103) and other components more secure, and finally forming an SQ four-phase common mode inductor.

7. The preparation method according to claim 6, characterized in that: In step S1, the number of turns of the windings N1 / N2 coil (104) and N3 / N4 coil (105) is set to 5 turns.

8. The preparation method according to claim 6, characterized in that: In step S2, the laser stripping length of the windings N1 / N2 (104) and N3 / N4 (105) is controlled at 8.0 mm.

9. The preparation method according to claim 6, characterized in that: In step S4, the baking temperature for the entire component is set at 120±10℃, and the baking time is set at 90 minutes.

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