Reconfigurable multi-layer inductor based on current-frequency double feedback

Abstract

The application discloses a reconfigurable multi-layer stacked inductor based on current-frequency double feedback, which comprises a winding and a multi-layer stacked core, the winding is wound by a plurality of Litz wires and is used for passing working current and generating a magnetic field; the multi-layer stacked core is alternately stacked into a multi-layer structure by a plurality of core layer sheets and composite interlayers; the composite interlayer comprises a current response layer, a magnetostrictive layer and a frequency response layer, the current response layer is used for responding to current change, the preparation material of the current response layer comprises a magneto-rheological elastomer, and the magnetic field intensity can simultaneously respond to the change when the current changes; the preparation material of the magnetostrictive layer comprises a magnetostrictive alloy, and the magnetostrictive alloy can be strained when the magnetic field intensity changes, so as to further change the interlayer gap of the multi-layer stacked core; the frequency response layer is used for responding to frequency change, the preparation material of the frequency response layer comprises a composite ceramic, the dielectric loss of the composite ceramic simultaneously responds to the change when the current frequency changes, and the impedance of the composite interlayer is further changed.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and in particular to a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback. Background Art

[0002] Traditional inductors are prone to saturation or high-frequency losses under a wide range of current or frequency conditions, resulting in performance degradation. In the prior art, inductance adjustment is mostly achieved by mechanically moving the magnetic core or adding a control circuit, which has disadvantages such as slow response, complex structure, and large size. In view of this, the present invention provides a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback, realizing a dynamically self-adjusting inductor structure to adapt to rapidly changing current and frequency conditions. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback. By introducing a composite response material between the core layers, the magnetic circuit parameters are automatically reconstructed through the physical mechanism of the composite response material, thereby realizing dynamic self-regulation of the inductance value, that is, realizing automatic reconstruction of the inductance value under current-frequency dual feedback.

[0004] In order to achieve the above-mentioned objectives, the present invention provides a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback. In the technical solution of the present invention, the multi-layer stacked inductor includes a winding and a multi-layer stacked iron core. The winding is wound by multiple strands of Litz wire and is used to pass working current and generate a magnetic field; the multi-layer stacked iron core is composed of multiple iron core layers and multiple composite interlayers alternately stacked into a multi-layer structure.

[0005] Furthermore, in the technical solution of the present invention, the composite interlayer includes a current-responsive layer, a magnetostrictive layer, and a frequency-responsive layer. The current-responsive layer is configured to respond to changes in current and is made of a magnetorheological elastomer, capable of simultaneously changing the magnetic field intensity in response to changes in current. The magnetostrictive layer is configured to produce strain in response to changes in magnetic field intensity, thereby further changing the interlayer gap of the multi-layer laminated core. The frequency-responsive layer is configured to respond to changes in frequency and is made of a composite ceramic. When the current frequency changes, the dielectric loss of the composite ceramic simultaneously changes in response, further causing the impedance of the composite interlayer to change.

[0006] Furthermore, in the technical solution of the present invention, the plurality of core layers are Thickness alloy, and the surface is oxidized to form an oxidized insulating layer; the thickness of the composite interlayer is , respectively embedded between every two layers of core sheets.

[0007] Furthermore, in the technical solution of the present invention, in the composite interlayer, the preparation material of the current response layer also includes Volume fraction Core-shell particles, and the The particle size of core-shell particles is smaller than ; The magnetostrictive alloy is Pseudo binary rare earth magnetostrictive alloy; the composite ceramic is a volume ratio of of Composite ceramics.

[0008] Beneficial Effects: In summary, the present invention provides a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback, comprising a winding and a multi-layer stacked core. The multi-layer stacked core is composed of alternately stacked core layers and a composite interlayer, wherein the composite interlayer includes a current-responsive layer based on a magnetorheological elastomer, a magnetostrictive layer based on a magnetostrictive alloy, and a frequency-responsive layer based on a composite ceramic structure. When the current change increases, the magnetic particles of the magnetostrictive alloy recombine and the magnetostrictive effect increase the magnetic resistance and decrease the inductance to avoid saturation. When the frequency change increases, the dielectric loss of the composite ceramic structure increases, increasing the high-frequency impedance and achieving high-frequency stability. The reconfigurable multi-layer stacked inductor based on current-frequency dual feedback of the present invention utilizes the composite interlayer between the core layers to respond to changes in the operating current and frequency, and further automatically reconstructs the magnetic circuit parameters through a physical mechanism to achieve dynamic self-regulation of the inductance value. Compared with the prior art, wide-range adaptive adjustment of the inductance can be achieved without the need for an external control circuit.

[0009] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0011] Figure 1 2. A schematic structural diagram of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention;

[0012] Figure 2 It is a partial structural enlarged schematic diagram of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention;

[0013] Figure 3 Schematic diagram of a composite sandwich structure of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention;

[0014] Figure 4 Schematic diagram of the system composition of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention;

[0015] In the figure: 101, winding; 102, multi-layer laminated iron core; 102a, iron core layer; 102b, composite interlayer; 102b-1, current response layer; 102b-2, magnetostrictive layer; 102b-3, frequency response layer. DETAILED DESCRIPTION

[0016] In order to make the objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] The core of the embodiment of the present invention is to provide a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback. This embodiment introduces a composite response material between the core layers, automatically reconstructs the magnetic circuit parameters through the physical mechanism of the composite response material, and realizes dynamic self-regulation of the inductance value, that is, realizes automatic reconstruction of the inductance value under current-frequency dual feedback.

[0018] Figure 1 Schematic diagram of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention. Figure 4 FIG. 1 is a schematic diagram of a system composition of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention. Figure 1 and Figure 4 As shown, the reconfigurable multi-layer stacked inductor includes a winding 101 and a multi-layer stacked core 102. In this embodiment, the reconfigurable multi-layer stacked inductor is preferably a toroidal inductor including the winding 101 and the multi-layer stacked core 102 as shown in the figure.

[0019] Specifically, in this embodiment, the winding 101 is wound by multiple strands of Litz wire, which is used to pass the working current and generate a magnetic field, and the multiple strands of Litz wire are connected in parallel to reduce skin effect loss; wherein, Figure 2 FIG. 1 is a partial structural enlarged schematic diagram of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention, as shown in FIG. Figure 2 As shown, the multi-layer laminated core 102 is formed by alternately stacking a plurality of core layers 102a and a plurality of composite interlayers 102b into a multi-layer structure, wherein the plurality of core layers 102a are Thickness alloy, and the surface is oxidized to form an oxidized insulating layer, and the thickness of the composite interlayer 102b is , respectively embedded between every two layers of core sheets 102a, and multiple core sheets 102a and composite interlayer 102b are formed into an integrated structure by hot pressing; in this embodiment, the preferred toroidal inductor has better pressure uniformity between layers than the cylindrical structure inductor, which is conducive to the stability of the composite interlayer 102b. At the same time, the main magnetic circuit of the toroidal inductor is closed and has no air gap, that is, the composite interlayer 102b serves as the only adjustable magnetic resistance, which can reduce the influence of errors caused by other factors.

[0020] Specifically, in this embodiment, Figure 3 FIG. 1 is a schematic diagram of a composite sandwich structure of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to an embodiment of the present invention, as shown in FIG. Figure 3 As shown, the composite interlayer 102b includes a current-responsive layer 102b-1, a magnetostrictive layer 102b-2, and a frequency-responsive layer 102b-3. That is, the composite interlayer 102b is composed of three layers of composite material. Based on the physical mechanism of the three layers of composite material of the composite interlayer 102b, the inductance value is reconstructed in response to changes in current and frequency.

[0021] Specifically, in this embodiment, the current response layer 102b-1 is used to respond to current changes. The preparation material of the current response layer 102b-1 includes a magnetorheological elastomer. When the current changes, the magnetorheological elastomer can indirectly cause the change of the effective magnetic field strength inside it, that is, the magnetic field strength can respond to the change of the current. The preparation material of the current response layer 102b-1 also includes Volume fraction core-shell particles, and The particle size of core-shell particles is smaller than , The core-shell particles are used to further realize the current response of the current response layer 102b-1. When the current increases suddenly, the magnetic field strength increases. The magnetic core is magnetized, so that the magnetic moment of the particles is oriented and arranged along the direction of the magnetic field to form a magnetic chain structure, which leads to a decrease in the interlayer equivalent magnetic permeability of the current response layer 102b-1. The magnetic resistance and magnetic permeability are inversely proportional, that is, the interlayer equivalent magnetic resistance of the current response layer 102b-1 increases. The inductance definition formula is , where Expressed as the inductance value, Expressed as the number of winding turns, It is expressed as magnetic resistance, that is, the interlayer equivalent magnetic resistance of the current response layer 102b-1 increases, further reducing the inductance, thereby improving the anti-saturation ability to avoid saturation; in this embodiment, the current response layer 102b-1 contains magnetic particles. The magnetorheological elastomer of the core-shell particles responds to changes in the magnetic field to reorganize the particle structure, thereby achieving adaptive control of the equivalent magnetic permeability between layers of the current response layer 102b-1 under current feedback, and further achieving adaptive adjustment of the inductance value. At the same time, in this embodiment, the current response layer 102b-1 is prepared by a screen printing process.

[0022] Specifically, in this embodiment, the preparation material of the magnetostrictive layer 102b-2 includes a magnetostrictive alloy, which can generate strain when the magnetic field intensity changes, so as to further change the interlayer gap of the multi-layer laminated core 102; wherein the magnetostrictive alloy is When the current of the pseudo-binary rare earth magnetostrictive alloy suddenly increases, the magnetic field strength increases, driving the magnetic domain of the magnetostrictive layer 102b-2 to flip, generating positive magnetostrictive strain, causing the magnetostrictive layer 102b-2 to expand along the magnetic field direction. This increases the interlayer gap of the magnetostrictive layer 102b-2. The interlayer gap and magnetoresistance are directly proportional, which leads to an increase in the interlayer equivalent magnetoresistance of the magnetostrictive layer 102b-2, further reducing the inductance, thereby improving the anti-saturation capability and avoiding saturation. In this embodiment, the magnetostrictive layer 102b-2 adjusts the interlayer gap of the magnetostrictive layer 102b-2 through the magnetostrictive effect of the magnetostrictive alloy, achieving further adjustment of the inductance under current feedback. In this embodiment, the magnetostrictive layer 102b-2 is fabricated using a magnetron sputtering process.

[0023] Specifically, in this embodiment, the frequency response layer 102b-3 is used to respond to frequency changes. The preparation material of the frequency response layer 102b-3 includes a composite ceramic, wherein the composite ceramic has a volume ratio of of When the current frequency changes, the dielectric loss of the composite ceramic also changes in response, further causing the impedance of the composite interlayer 102b to change. In this embodiment, the frequency response layer 102b-3 is made of ferroelectric / ferromagnetic composite ceramic. By utilizing the technical characteristics of the composite ceramic having different dielectric loss at different operating frequencies, the interlayer equivalent impedance of the frequency response layer 102b-3 can be adaptively adjusted under frequency feedback, thereby further achieving adaptive adjustment of the inductance value. At the same time, in this embodiment, the frequency response layer 102b-3 is prepared by a sintering process under a nitrogen atmosphere.

[0024] Specifically, this embodiment of a reconfigurable multi-layer stacked inductor based on current-frequency dual feedback utilizes the composite interlayer 102b between the core layers 102a to respond to changes in operating current and frequency, automatically reconfiguring magnetic circuit parameters through a physical mechanism to achieve dynamic self-regulation of the inductance value. The specific operating principles include:

[0025] Current response path:

[0026] Under high current conditions, the current in the winding 101 increases, generating a strong magnetic field. The magnetic field strength increases, and the magnetic field penetrates the composite interlayer 102b between the core layers 102a. The magnetic field strength exceeds the threshold value (magnetorheological elastomer and When the stress between core-shell particles is The core-shell particles are arranged in chains along the magnetic field, causing the interlayer magnetic permeability of the current-responsive layer 102b-1 to decrease, resulting in an increase in the equivalent magnetic resistance. Simultaneously, the increased magnetic field intensity drives the magnetic domains of the magnetostrictive layer 102b-2 to flip, generating positive magnetostrictive strain, causing the magnetostrictive layer 102b-2 to expand along the magnetic field. This increases the interlayer gap of the magnetostrictive layer 102b-2, resulting in an increase in the equivalent magnetic resistance. Due to the dual effects of the decreased interlayer magnetic permeability of the current-responsive layer 102b-1 and the increased interlayer gap of the magnetostrictive layer 102b-2, the equivalent magnetic resistance is further increased, the inductance value decreases rapidly, and the anti-saturation goal is achieved.

[0027] Frequency response path:

[0028] Under high-frequency operating conditions, the high-frequency magnetic field gathers at the edge of the multi-layer laminated core 102. The high-frequency alternating magnetic field excites dielectric relaxation of the grain boundaries of the composite ceramic in the frequency response layer 102b-3. Charges accumulate at the insulating grain boundaries, increasing the grain boundary capacitance and the interlayer equivalent impedance. That is, the dielectric loss of the composite ceramic in the frequency response layer 102b-3 increases, thereby increasing the interlayer equivalent impedance of the frequency response layer 102b-3, reducing the inductance to achieve high-frequency stability, and avoiding switching transient oscillations.

[0029] Dynamic synergy:

[0030] Under high-frequency and high-current conditions (such as those used in battery fast charging), the current-responsive layer 102b-1, the magnetostrictive layer 102b-2, and the frequency-responsive layer 102b-3 work together. As the current increases, the interlayer equivalent magnetic permeability of the current-responsive layer 102b-1 decreases, and the equivalent impedance of the composite interlayer 102b increases. Simultaneously, the strong magnetic field generated by the increased current causes the magnetostrictive layer 102b-2 to produce a magnetostrictive effect, further amplifying the equivalent impedance of the composite interlayer 102b. Furthermore, the increase in operating frequency increases the dielectric loss of the frequency-responsive layer 102b-3, further amplifying the equivalent impedance of the composite interlayer 102b. The combined effects of these three factors accelerate the increase in the equivalent impedance of the composite interlayer 102b, causing the inductance value to decay rapidly to match the power requirements.

[0031] Under high-frequency and low-current operating conditions (such as battery standby), the current response layer 102b-1 is inactive, and the interlayer equivalent permeability of the current response layer 102b-1 remains high to reduce losses. At the same time, the interlayer equivalent impedance of the frequency response layer 102b-3 increases to suppress high-frequency ripple, ensuring high-frequency stability while avoiding unnecessary current loss.

[0032] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A reconfigurable multi-layer stacked inductor based on current-frequency dual feedback, characterized in that: include: The winding (101) is formed by winding a plurality of Litz wires and is used to pass a working current and generate a magnetic field; A multi-layer laminated iron core (102) is formed by alternately stacking a plurality of iron core layers (102a) and a plurality of composite interlayers (102b) into a multi-layer structure; The composite interlayer (102b) comprises: A current response layer (102b-1) is used to respond to current changes. The material used to prepare the current response layer (102b-1) includes a magnetorheological elastomer, which can respond to changes in magnetic field intensity when the current changes. A magnetostrictive layer (102b-2), wherein the preparation material of the magnetostrictive layer (102b-2) includes a magnetostrictive alloy and is capable of generating strain when the magnetic field intensity changes, so as to further change the interlayer gap of the multi-layer laminated iron core (102); The frequency response layer (102b-3) is used to respond to frequency changes. The preparation material of the frequency response layer (102b-3) includes composite ceramics. When the current frequency changes, the dielectric loss of the composite ceramics changes simultaneously, further causing the impedance of the composite interlayer (102b) to change.

2. The reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to claim 1, characterized in that: The plurality of core layers (102a) are Thickness The surface of the alloy is oxidized to form an oxidized insulating layer.

3. The reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to claim 1, characterized in that: The thickness of the composite interlayer (102b) is , respectively embedded between every two layers of core sheets (102a).

4. The reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to claim 1, characterized in that: The preparation materials of the current response layer (102b-1) also include Volume fraction Core-shell particles, and the The particle size of core-shell particles is smaller than .

5. The reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to claim 1, characterized in that: The magnetostrictive alloy is Pseudo-binary rare earth magnetostrictive alloys.

6. The reconfigurable multi-layer stacked inductor based on current-frequency dual feedback according to claim 1, characterized in that: The composite ceramic has a volume ratio of of Composite ceramics.

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