Magnetic components and circuit devices

Abstract

To provide magnetic components and circuit devices that can be miniaturized and have high versatility. [Solution] The magnetic component MC comprises a non-inductive winding set (first non-inductive winding set 1) which is formed by connecting a pair of windings (first winding 1a, second winding 1b) wound so that the current flows in opposite directions to cancel out the magnetomotive force, and an inductive winding (first induction winding 2a, second induction winding 2b) wound to generate a magnetomotive force. In the magnetic component MC, the pair of windings included in the non-inductive winding set are arranged on the same magnetic path.

Description

Technical Field

[0001] This application relates to a magnetic component using a plurality of windings and a circuit device using the magnetic component.

Background Art

[0002] In recent years, due to the progress and expansion of information technology, the power supply system used in server computers in communication infrastructures such as data centers is configured by combining an AC-DC converter and a DC-DC converter. In recent years, the computing load of server computers has been steadily increasing, causing problems such as installation space and cooling capacity. In particular, magnetic devices such as inductors and transformers have the problem of occupying a large space within the power supply system. Therefore, for example, in Patent Document 1, magnetic components that reduce the volume of a resonant electric circuit have been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, magnetic components and the like disclosed in Patent Document 1 can only be used for connection of specific magnetic devices such as inductors and transformers, and their application range is limited to specific circuits.

[0005] The present invention has been made in view of such circumstances, and the main object of this application is to disclose a magnetic component that can be miniaturized and has enhanced versatility.

[0006] Another object of this application is to disclose a circuit device using the magnetic component disclosed in this application.

Means for Solving the Problems

[0007] To solve the above problems, the magnetic component disclosed in this application comprises a non-inductive winding set, which is formed by connecting a pair of windings wound so that their current-carrying directions are opposite to each other in order to cancel out the magnetomotive force, and an inductive winding wound to generate a magnetomotive force, wherein the pair of windings included in the non-inductive winding set are arranged on the same magnetic path.

[0008] Furthermore, in the magnetic component, the non-inductive winding set is characterized in that the pair of windings are connected in series, the pair of windings have the same number of turns, and the winding directions are opposite.

[0009] Furthermore, the magnetic component is characterized in that the induction winding is arranged on the same magnetic path as the non-inductive winding set.

[0010] Furthermore, the magnetic component is characterized in that the pair of windings included in the non-inductive winding assembly are wound in a plate shape and arranged in a stacked manner.

[0011] Furthermore, the magnetic component is characterized in that it comprises a plurality of non-inductive winding sets, and the plurality of non-inductive winding sets are stacked and arranged such that windings with different winding directions are arranged alternately.

[0012] Furthermore, the magnetic component is characterized in that the pair of windings and the induction winding included in the non-inductive winding set are wound in a cylindrical shape around the magnetic path as an axis, and are arranged to overlap radially from the magnetic path which serves as the axis.

[0013] Furthermore, the magnetic component is characterized by further comprising a magnetic material interposed between a pair of windings included in the non-inductive winding assembly.

[0014] Furthermore, the magnetic component is characterized by further comprising a core having a columnar portion wound around the pair of windings included in the non-inductive winding assembly.

[0015] The magnetic component is provided, and the non-inductive winding set included in the magnetic component functions as an inductor, and the inductive winding included in the magnetic component functions as a transformer.

Effect of the Invention

[0016] The magnetic component and the like disclosed in the present application have excellent effects such as being capable of miniaturization and enhancing versatility.

Brief Description of the Drawings

[0017] <( [Figure 1] It is a circuit diagram showing an example of a power supply system using the magnetic component disclosed in the present application. [Figure 2] It is a schematic perspective view showing an example of a circuit device using the magnetic component disclosed in the present application. [Figure 3] It is a schematic exploded perspective view showing an example of a circuit device using the magnetic component disclosed in the present application. [Figure 4] It is a schematic diagram conceptually showing an example of a partial cross-section of the magnetic component disclosed in the present application and the flow of magnetic field. [Figure 5] It is a schematic diagram conceptually showing an example of the arrangement of the first winding and the second winding included in the magnetic component disclosed in the present application. [Figure 6] It is a schematic diagram conceptually showing an example of the winding directions of the first winding and the second winding included in the magnetic component disclosed in the present application. [Figure 7] It is a schematic diagram conceptually showing an example of the relationship between the circuit device using the magnetic component disclosed in the present application and the magnetic field distribution. [Figure 8] It is a magnetic circuit model schematically showing an example of the relationship between the structure and parameters of the circuit device using the magnetic component disclosed in the present application. [Figure 9] It is a schematic diagram conceptually showing a measurement model of mutual inductance in a prototype of the magnetic component disclosed in the present application. [Figure 10] It is a schematic diagram showing an example of an equivalent circuit of mutual inductance in a prototype of the magnetic component disclosed in the present application. [Figure 11] It is a graph showing an example of the experimental results of a prototype of the magnetic component disclosed in the present application. [Figure 12] It is a circuit diagram showing an example of a prototype of the magnetic component disclosed in the present application. [Figure 13] It is a graph showing an example of the result of verifying the circuit operation in the prototype of the magnetic component disclosed in the present application. [Figure 14] It is a graph showing an example of the result of verifying the circuit operation in the prototype of the magnetic component disclosed in the present application. [Figure 15] It is a graph showing an example of the result of verifying the circuit operation in the prototype of the magnetic component disclosed in the present application. [Figure 16] It is a graph showing an example of the result of FFT analysis in the prototype of the magnetic component disclosed in the present application. [Figure 17] It is a graph showing an example of the result of FFT analysis in the prototype of the magnetic component disclosed in the present application. [Figure 18] It is a graph showing an example of the result of FFT analysis in the prototype of the magnetic component disclosed in the present application. [Figure 19] It is a photograph showing an example of the comparison result of the circuit device using the magnetic component disclosed in the present application. [Figure 20] It is a schematic perspective view showing an example of the circuit device using the magnetic component disclosed in the present application. [Figure 21] It is a schematic cross-sectional view schematically showing an example of the circuit device using the magnetic component disclosed in the present application. [Figure 22] It is a circuit diagram showing an example of an equivalent circuit of a part of the magnetic component disclosed in the present application. [Figure 23] It is a schematic cross-sectional view schematically showing an example of the circuit device using the magnetic component disclosed in the present application. [Figure 24] It is a circuit diagram showing an example of an equivalent circuit of a part of the magnetic component disclosed in the present application. [Figure 25] It is a schematic cross-sectional view schematically showing an example of the circuit device using the magnetic component disclosed in the present application. [Figure 26] It is a circuit diagram showing an example of an equivalent circuit of a part of the magnetic component disclosed in the present application. [Figure 27] It is a schematic cross-sectional view schematically showing an example of the circuit device using the magnetic component disclosed in the present application. [Figure 28]This is a circuit diagram showing an example of an equivalent circuit of the magnetic component disclosed in this application. [Figure 29] This is a schematic cross-sectional view illustrating a partial example of a circuit device using the magnetic components disclosed in this application. [Figure 30] This is a schematic cross-sectional view illustrating an example of a circuit device using the magnetic components disclosed in this application. [Figure 31] This is an exploded perspective view showing some examples of magnetic components disclosed in this application. [Figure 32] This is a circuit diagram showing an example of an equivalent circuit of the magnetic component disclosed in this application. [Figure 33] This is a schematic cross-sectional view illustrating an example of a circuit device using the magnetic components disclosed in this application. [Figure 34] This is a circuit diagram showing an example of an equivalent circuit of the magnetic component disclosed in this application. [Figure 35] This is a schematic cross-sectional view illustrating an example of a circuit device using the magnetic components disclosed in this application. [Figure 36] This is a circuit diagram showing an example of an equivalent circuit of the magnetic component disclosed in this application. [Modes for carrying out the invention]

[0018] Embodiments of the present invention will be described below with reference to the drawings.

[0019] <Examples of application> The magnetic component disclosed herein is used, for example, as a circuit device incorporated into a power supply circuit in a system such as a server computer or a factory system. The following describes, with reference to the drawings, the magnetic component MC and the circuit device CD using the magnetic component MC as illustrated in the drawings.

[0020] Figure 1 is a circuit diagram showing an example of a power supply system using the magnetic component MC disclosed in this application. The power supply system illustrated in Figure 1 includes a PFC (Power Factor Correction) circuit and an LLC converter. The PFC circuit illustrated in Figure 1 includes a first winding 1a, and the LLC converter includes a second winding 1b and a transformer 2 using multiple induction windings that generate magnetomotive force. The magnetic component MC disclosed in this application is implemented in the form of a circuit device CD that includes multiple magnetic elements such as the first winding 1a, the second winding 1b, and the transformer 2. Various embodiments of the implementation of the magnetic component MC and circuit device CD disclosed in this application will be illustrated and described below.

[0021] <First Embodiment> Figure 2 is a schematic perspective view showing an example of a circuit device CD using the magnetic component MC disclosed in this application. Figure 3 is a schematic exploded perspective view showing an example of a circuit device CD using the magnetic component MC disclosed in this application. For convenience, in the following description, the upper side of the figure will be referred to as "up" and the lower side as "down". Note that these upper and lower directions are for convenience in explanation and do not limit the installation direction of the magnetic component MC. The circuit device CD disclosed in this application, illustrated in Figures 2 and 3, comprises a first winding 1a (winding), a second winding 1b (winding), a third winding 3a (winding), and a fourth winding 3b (winding) as magnetic elements, as well as a transformer 2. Furthermore, the circuit device CD comprises various members such as a core 4, a first intervening material 1c (magnetic material), and a second intervening material 3c (magnetic material).

[0022] The first winding 1a and the second winding 1b are connected in series as a pair of windings, and are wound in a thin plate shape using plate-shaped windings so that the direction of current flow is opposite to cancel out the magnetomotive forces. For example, when current is applied, the current flows counterclockwise in the first winding 1a and clockwise in the second winding 1b. Also, the first winding 1a and the second winding 1b have the same number of turns and are wound in opposite directions, forming a magnetic field in which the magnetomotive forces cancel out each other. Here, "same number of turns" means that the number of turns is substantially the same to the extent that the magnetomotive forces cancel each other out, and this concept includes cases where there are slight differences depending on the wiring configuration. Furthermore, "in order to cancel out each other's magnetomotive forces" means that phenomena such as electromagnetic induction do not occur between the first winding 1a and the second winding 1b, but it is also possible to configure it so that electromagnetic induction occurs between the first winding 1a and other magnetic elements. A first intervening material 1c, formed in the shape of a thin plate using a soft magnetic material such as resin or ceramic, is sandwiched between the first winding 1a and the second winding 1b. The first winding 1a, the first intervening material 1c, and the second winding 1b are stacked to form the first non-inductive winding assembly 1 (non-inductive winding assembly). The first winding 1a, the first intervening material 1c, and the second winding 1b that constitute the first non-inductive winding assembly 1 are substantially the same shape, with a rectangular outer shape in plan view, and a rectangular opening formed near the center with four sides substantially parallel to the outer shape. The axes of the magnetic flux generated when current is applied are located approximately at the center of the outer shape and the opening of the first winding 1a and the second winding 1b. That is, the first winding 1a and the second winding 1b are arranged on the same magnetic path such that their respective magnetic flux axes are located on the same straight line. Note that the first winding 1a and the second winding 1b illustrated in Figures 2 and 3 are incorporated into the circuit device CD to function as inductors, but they may also be incorporated into the circuit device CD to function as magnetic elements other than inductors.

[0023] The third winding 3a and the fourth winding 3b are connected in series as a pair of windings, and are wound in a thin plate shape using plate-shaped windings so that the direction of current flow is opposite to each other in order to cancel out the magnetomotive force. A second intervening material 3c, formed in a thin plate shape using a soft magnetic material, is sandwiched between the third winding 3a and the fourth winding 3b. The third winding 3a, the second intervening material 3c, and the fourth winding 3b are stacked to form the second non-inductive winding assembly 3 (non-inductive winding assembly). The third winding 3a, the second intervening material 3c, and the fourth winding 3b that constitute the second non-inductive winding assembly 3 are substantially the same shape, with a rectangular outer shape in plan view, and a square opening formed near the center, with four sides substantially parallel to the outer shape. The axis of the magnetic flux generated when current is applied is located approximately at the center of the outer shape and the opening of the third winding 3a and the fourth winding 3b. In other words, the third winding 3a and the fourth winding 3b are arranged on the same magnetic path such that their respective magnetic flux axes lie on the same straight line.

[0024] Transformer 2 is equipped with a first induction winding 2a (induction winding) that functions as a primary coil and a second induction winding 2b (induction winding) that functions as a secondary coil. Both the first induction winding 2a and the second induction winding 2b are wound in a thin plate shape using plate-shaped windings, and the first induction winding 2a and the second induction winding 2b are stacked. The first induction winding 2a and the second induction winding 2b that constitute transformer 2 are substantially the same shape, with a rectangular outer shape in plan view, and a rectangular opening formed near the center with four sides substantially parallel to the outer shape. The axis of the magnetic flux generated when energized is located substantially at the center of the outer shape and the opening of the first induction winding 2a and the second induction winding 2b. That is, the first induction winding 2a and the second induction winding 2b are arranged so that their respective magnetic flux axes are located on the same straight line.

[0025] Core 4 is formed by combining an upper half shown above and a lower half shown below, and serves as the housing for the magnetic component MC. Core 4 has a columnar portion 40 that acts as a mid-foot, and the columnar portion 40 is formed in the shape of a roughly rectangular plate. The columnar portion 40 passes through the openings of the first winding 1a, the first interfacing material 1c, the second winding 1b, the third winding 3a, the second interfacing material 3c, the fourth winding 3b, and the first induction winding 2a and the second induction winding 2b. That is, the windings of the first winding 1a, the first interfacing material 1c, the second winding 1b, the third winding 3a, the second interfacing material 3c, the fourth winding 3b, and the first induction winding 2a and the second induction winding 2b are each wound around the columnar portion 40, and the columnar portion 40 is positioned to correspond to the magnetic flux axis of each winding. Although Figures 2 and 3 show an embodiment using an EE-type core 4, the magnetic component MC disclosed in this application can be developed into various forms, such as using a PQ-type core 4.

[0026] This section describes the magnetic field generated by the magnetic component MC disclosed in this application and its effects. Figure 4 is a schematic diagram conceptually showing a cross-section of a part of the magnetic component MC disclosed in this application and an example of the flow of the magnetic field. Figure 4 schematically shows the cross-sections of the first winding 1a and the second winding 1b, and schematically shows the direction of the current flowing through the first winding 1a and the second winding 1b, as well as the magnetic field generated by the first winding 1a and the second winding 1b. In the first winding 1a shown at the top, current flows from the back to the front in the diagram, generating a magnetic field that is upward and to the left as indicated by the topmost arrow, and a magnetic field that is downward and to the right as indicated by the bottommost arrow. In the second winding 1b shown at the bottom, current flows from the front to the back, generating a magnetic field that is upward and to the right as indicated by the second arrow from the top, and a magnetic field that is downward and to the left as indicated by the second arrow from the bottom. Above and below the first winding 1a and the second winding 1b, the magnetic field generated by the first winding 1a and the magnetic field generated by the second winding 1b cancel each other out.

[0027] As described above, the first winding 1a and the second winding 1b are arranged on the same magnetic path such that their respective magnetic flux axes lie on the same straight line. The first winding 1a and the second winding 1b, which are arranged adjacent to each other with the first intervening material 1c (omitted in Figure 4) in between, are arranged such that the magnetic fields of their magnetic flux axes are in opposite directions and the absolute values ​​of their magnetic fields are substantially equivalent. Here, "magnetic fields in opposite directions and substantially equivalent absolute values" means that the magnetomotive forces of the adjacent first winding 1a and the second winding 1b cancel each other out, and their influence on the upper and lower magnetic fields is neutralized to a level that does not cause practical problems.

[0028] Figure 5 is a schematic diagram conceptually showing an example of the arrangement of the first winding 1a and the second winding 1b in the magnetic component MC disclosed in this application. Figure 6 is a schematic diagram conceptually showing an example of the winding direction of the first winding 1a and the second winding 1b in the magnetic component MC disclosed in this application. Figure 5 schematically shows the stacked first winding 1a and the second winding 1b, and the arrows schematically show the current flowing through the wiring connected in series. Figure 6 schematically shows the direction of current as the direction of current flow on the first winding 1a and the second winding 1b with arrows. Figures 5 and 6 show an example of a configuration for forming the magnetic fields generated by the first winding 1a and the second winding 1b to cancel each other out. That is, the first winding 1a and the second winding 1b have opposite winding directions, and are formed so that the same value of current circulates in opposite directions. When current is passed through the first winding 1a and the second winding 1b configured in this manner, according to Ampere's law, the magnetomotive forces cancel each other out, and the magnetic field can be considered zero. The same applies to the third winding 3a and the fourth winding 3b. In this way, the magnetic component MC disclosed in this application can prevent mutual interference, such as making the external magnetic field zero, by stacking a pair of windings and canceling out their magnetomotive forces.

[0029] Next, we will explain how to calculate the theoretical inductance when each winding of the magnetic component MC disclosed in this application is used as an inductor. Figure 7 is a schematic diagram conceptually showing an example of the relationship between a circuit device CD using the magnetic component MC disclosed in this application and the distribution of the magnetic field. Figure 8 is a magnetic circuit model schematically showing an example of the relationship between the structure and parameters of the circuit device CD using the magnetic component MC disclosed in this application. The left side of Figure 7 schematically shows the cross-section of the magnetic component MC and the direction of the current, and the right side of Figure 7 shows a graph showing the relationship with the internal structure with the strength of the inductance on the horizontal axis. Figure 8 shows the relationship between the structure of the magnetic component MC and the parameters used in the calculation formulas shown below. The inductance of a magnetic element is determined by the sum of the magnetic energies E. Magnetic energy is proportional to the square of the magnetic field. Assuming that the permeability of core 4 is sufficiently high and the spacing between windings is sufficiently large compared to the winding width, it can be assumed that most of the magnetic energy is distributed in the space occupied by the soft magnetic material with low permeability, i.e., the first intervening material 1c and the second intervening material 3c. From the magnetic field distribution illustrated in Figure 7, the magnetic fields of the first intervening material 1c of the first non-inductive winding assembly 1 and the second intervening material 3c of the second non-inductive winding assembly 3 do not depend on other magnetic elements. Therefore, the magnetic energy of each non-inductive winding assembly can be determined by considering only the individual non-inductive winding assembly. Since core 4 has a symmetrical structure, doubling the magnetic energy of one non-inductive winding assembly gives the total magnetic energy of each non-inductive winding assembly. The magnetic energy E of the first non-inductive winding assembly 1 can be expressed as the following equation (1) using the inductance L1 of the first winding 1a and the inductance L2 of the second winding 1b.

[0030]

number

[0031] In equation (1) above, the magnetic field of the soft magnetic material (first intervening material 1c) can be expressed as equation (2) below, according to Ampère's law.

[0032]

number

[0033] In the above equation (1), the magnetic field of the soft magnetic material (first intervening material 1c) can be expressed as the following equation (2) according to Ampère's law.

[0034]

number

[0035] Figure 8 shows a magnetic circuit model under the condition that μc >> μ >> μ0 in equation (3) above, where μc is the permeability of core 4, μ0 is the permeability of air, and μc >> μ >> μ0. Generally, the magnetic reluctance of soft magnetic materials is equivalent to R1 and R2 in the magnetic circuit model illustrated in Figure 7, so R1 = w / μA1 and R2 = w / μA2. Therefore, in order to secure the target inductance, it is necessary to increase the number of windings. To solve this problem, the magnetic component MC disclosed in this application has a first intervening material 1c inserted between the windings as a soft magnetic material. The first intervening material 1c increases the magnetic energy between the windings and reduces the inductance.

[0036] The above description described a first non-inductive winding assembly 1 comprising a first winding 1a, a second winding 1b, and a first intervening material 1c, but the same applies to a second non-inductive winding assembly 3 comprising a third winding 3a, a fourth winding 3b, and a second intervening material 3c.

[0037] <Example of experiment> Next, the experimental results regarding the magnetic component MC disclosed in this application will be described. Figure 9 is a schematic diagram conceptually showing a measurement model of the mutual inductance in a prototype of the magnetic component MC disclosed in this application. Figure 10 is a schematic diagram showing an example of an equivalent circuit of the mutual inductance in a prototype of the magnetic component MC disclosed in this application. Figure 9(a) shows the mutual inductance related to the first winding 1a, and Figure 9(b) shows the mutual inductance related to the second winding 1b. Figure 10(a) shows the equivalent circuit of the primary side of the transformer 2, and Figure 10(b) shows the equivalent circuit of the secondary side of the transformer 2. As an experiment regarding the magnetic component MC disclosed in this application, a prototype of the magnetic component MC exemplified in Figure 1 was fabricated, and the mutual inductance between each magnetic element was measured as exemplified in Figure 9. As exemplified in Figure 9, the magnetic component MC disclosed in this application has many interfering mutual inductances. Therefore, the mutual inductance is converted based on the induced electromotive force (EMF) generated in each magnetic element and compared with the self-inductance. As a result, if the ratio of mutual inductance to self-inductance is sufficiently small, it can be inferred that mutual interference is small. Measuring the mutual inductance between an inductor such as the first winding 1a and the transformer 2 is different from measuring the mutual inductance between two windings such as the first winding 1a and the second winding 1b. As shown in the equivalent circuit of Figure 10, the induced electromotive force on the primary side and the induced electromotive force on the secondary side of the transformer 2 are generated in opposite directions. Therefore, the mutual inductance between the transformer 2 and the winding used as an inductor is evaluated by subtracting these two mutual inductances.

[0038] Figure 11 is a graph showing an example of experimental results for a prototype of the magnetic component MC disclosed in this application. Figure 11 shows the inductance values ​​for each winding. Figure 11(a) shows the experimental results for the first winding 1a, showing from left to right the self-inductance L1, mutual inductance (N1 / N2)M12, and mutual inductance [(N1 / Np)M1p-(N1 / Ns)M1s]. Figure 11(b) shows the experimental results for the second winding 1b, showing from left to right the self-inductance L2, mutual inductance (N2 / N1)M12, and mutual inductance [(N2 / Np)M2p-(N2 / Ns)M2s]. For the experiments, an impedance analyzer IM7581 manufactured by HIOKI E.E. CORPORATION and a frequency response analyzer FRA51615 manufactured by NF Circuit Design Block Co., Ltd. were used. Experimental results showed that both the first winding 1a and the second winding 1b have a small mutual inductance of approximately 3% of their self-inductance. The parameters set are shown in Table 1 below.

[0039] [Table 1]

[0040] Next, we will describe the experimental results verifying whether there were any problems with the circuit operation of the prototype magnetic component MC disclosed in this application. Figure 12 is a circuit diagram showing an example of a prototype magnetic component MC disclosed in this application. The circuit illustrated in Figure 12 shows an example of an AC-DC converter used to verify the circuit operation of the magnetic component MC disclosed in this application. The magnetic component MC illustrated in Figure 12 is an experimental circuit combining a boost chopper and a phase-shifted full-bridge converter (PSFC). The boost chopper operates at a power factor of 0.35 and a frequency of 700 kHz, and the PSFC operates at a power factor of 0.8 and a frequency of 500 kHz. With an input voltage of 15 V, the output voltage was 7.5 V.

[0041] Figures 13 to 15 are graphs showing examples of the results of verifying the circuit operation of a prototype of the magnetic component MC disclosed in this application. Figures 13 to 15 show the changes in voltage and current values ​​over time for the first winding 1a, the second winding 1b, and the first induction winding 2a of the transformer 2, respectively. In the graph for the first winding 1a shown in Figure 13, the lower part shows the change in voltage value over time with the scale on the left, and the upper part shows the change in current value over time with the scale on the right. In the graph for the second winding 1b shown in Figure 14, the lower part shows the change in voltage value over time with the scale on the left, and the upper part shows the change in current value over time with the scale on the right. In the graph for the first induction winding 2a of the transformer 2 shown in Figure 15, the lower part shows the change in voltage value over time with the scale on the left, and the upper part shows the change in current value over time with the scale on the right. As illustrated in Figures 13 to 15, no waveforms were observed that would cause the power supply circuit to fail, confirming that the magnetic component MC disclosed in this application is functioning without problems.

[0042] Next, we will describe the experimental results verifying the effect of suppressing mutual interference in a prototype of the magnetic component MC disclosed in this application. Focusing on the current waveform of the first winding 1a illustrated in Figure 13, the current ripple differs with each period, and beat noise is observed. Mutual interference between each magnetic element may be the cause of the beat noise. Therefore, we will quantitatively verify the presence or absence of mutual interference between magnetic elements using FFT analysis.

[0043] Figures 16 to 18 are graphs showing examples of FFT analysis results for a prototype of the magnetic component MC disclosed in this application. Figures 16 to 18 show the relationship between frequency on the horizontal axis and amplitude spectrum on the vertical axis for the first winding 1a, the second winding 1b, and the first induction winding 2a of transformer 2, respectively. The operating frequency of the first winding 1a is 700 kHz, and the operating frequency of transformer 2 is 500 kHz. The operating frequency of the second winding 1b, which is incorporated as a rectifier circuit, is 1 MHz. From the FFT analysis results illustrated in Figures 16 to 18, it can be observed that frequency components that appear to be due to the influence of other magnetic elements are sufficiently smaller than the original amplitude spectrum, indicating that interference is suppressed. In Figure 16, which shows the FFT analysis results of the current waveform of the first winding 1a where beat noise was observed, the second winding 1b shows a spectrum 0.15 times that of the first winding 1a, and transformer 2 shows a spectrum 0.02 times that of the first winding 1a. The reason for the increased size of the second winding 1b is presumed to be that the arrangement of the first winding 1a and the second winding 1b is physically closer to that of transformer 2. Furthermore, the spectrum of transformer 2, as exemplified in Figure 18, is 0.5 times larger than the spectrum of the second winding 1b, as exemplified in Figure 17. This is presumed to be due to the difference in the voltage duty cycle of transformer 2, and is therefore not considered to be due to mutual interference. This is also evident from the fact that the spectrum of the second winding 1b is sufficiently smaller than that of transformer 2.

[0044] Next, we will describe a prototype that verifies the miniaturization of the magnetic component MC disclosed in this application. By applying the magnetic component MC disclosed in this application, it is possible to create, for example, a single ferrite core. Figure 19 is a photograph showing an example of the comparison results of a circuit device CD using the magnetic component MC disclosed in this application. The left side of Figure 19 is a circuit board with a conventional magnetic element mounted on it, and the right side is a circuit board (circuit device CD) with the magnetic component MC disclosed in this application mounted on it. Both circuit boards are constructed with equivalent inductance, DC resistance, and magnetic flux density of the magnetic core. As a result of the comparison, a reduction of approximately 20% was confirmed, and it was possible to verify that the magnetic component MC disclosed in this application is effective in miniaturizing power supply circuits.

[0045] <Second Embodiment> The second embodiment is a configuration in which each winding is superimposed in the radial direction. For the sake of clarity in the explanation, the magnetic component MC and circuit device CD according to the second embodiment are denoted by the same reference numerals as in the first embodiment, and a detailed explanation is omitted to clarify their correspondence with the first embodiment.

[0046] Figure 20 is a schematic perspective view showing an example of a circuit device CD using the magnetic component MC disclosed in this application. Figure 21 is a schematic cross-sectional view showing an example of a circuit device CD using the magnetic component MC disclosed in this application. In the circuit device CD according to the second embodiment, the magnetic component MC has a gap (space) near the center of the columnar portion 40 which forms the midfoot of the core 4. The magnetic component MC has a first induction winding 2a wound around the columnar portion 40 of the core 4. Furthermore, the magnetic component MC has a first winding 1a wound around the outer circumference of the first winding 1a, a soft magnetic first intervening material 1c wound around the outer circumference of the first intervening material 1c, and a second winding 1b wound around the outer circumference of the first intervening material 1c. The first winding 1a, the first intervening material 1c, and the second winding 1b form a first non-inductive winding set 1. The first winding 1a and the second winding 1b are connected in series, have the same number of turns, and are wound so that their current flows in opposite directions to cancel out each other's magnetomotive forces.

[0047] As shown in Figures 20 and 21, in the magnetic component MC according to the second embodiment, the first induction winding 2a, the first winding 1a, the first interfacing material 1c, and the second winding 1b are wound in a cylindrical shape around a columnar portion 40 that serves as a magnetic path. Each winding is wound so as to overlap radially around the columnar portion 40 that serves as a magnetic path.

[0048] Figure 22 is a circuit diagram showing an example of an equivalent circuit of a part of the magnetic component MC disclosed in this application. Figure 22(a) shows the first winding 1a, and Figure 22(b) shows the first induction winding 2a. In the circuit device CD illustrated as a second embodiment, the first winding 1a and the first induction winding 2a each constitute a circuit as electromagnetically independent inductors. The same applies to the second winding 1b.

[0049] In the second embodiment, the magnetic component MC of the circuit device CD is arranged with the first winding 1a and the second winding 1b adjacent to each other in the radial direction, and the winding directions are reversed, for example, so that the current flow directions are opposite to each other. As a result, the magnetic component MC can suitably reduce the magnetic field induced in the first winding 1a and the second winding 1b, reducing power loss due to the proximity effect, while also enabling miniaturization and increasing versatility, thus providing excellent effects.

[0050] <Third Embodiment> The third embodiment is a configuration in which each winding is wound along the axial direction of the columnar portion 40 of the core 4 and overlapped radially. For the sake of explanation, the configurations of the magnetic component MC and the circuit device CD according to the third embodiment are denoted by the same reference numerals as the corresponding configurations in the first embodiment, and detailed explanations are omitted.

[0051] Figure 23 is a schematic cross-sectional view illustrating an example of a circuit device CD using the magnetic component MC disclosed herein. In the circuit device CD according to the third embodiment, the magnetic component MC has a first induction winding 2a wound along the axial direction of a columnar portion 40 which forms the midpoint of the core 4, and a second induction winding 2b wound on the outer circumference of the first induction winding 2a along the axial direction of the columnar portion 40. The first induction winding 2a and the second induction winding 2b form a transformer 2. Furthermore, the magnetic component MC has windings on the outer circumference of the second induction winding 2b in the order of a first winding 1a, a third winding 3a, a first interfacing material 1c, a second winding 1b, and a fourth winding 3b, from the inside to the outside. The first winding 1a, the third winding 3a, the first interfacing material 1c, the second winding 1b, and the fourth winding 3b are each wound along the axial direction of the columnar portion 40. The first winding 1a, the first intervening material 1c, and the second winding 1b form the first non-inductive winding set 1, and the third winding 3a, the first intervening material 1c, and the fourth winding 3b form the second non-inductive winding set 3. The first winding 1a and the second winding 1b are connected in series, have the same number of turns, and are wound so that the direction of current flow is opposite to cancel out the magnetomotive force. The same applies to the third winding 3a and the fourth winding 3b. Note that the magnetic component MC may be made into a non-magnetic space by omitting the first intervening material 1c, which is a soft magnetic material, in which case it is possible to reduce material costs and achieve other excellent effects.

[0052] Figure 24 is a circuit diagram showing an example of an equivalent circuit of a part of the magnetic component MC disclosed in this application. Figure 24(a) shows the first winding 1a, and Figure 24(b) shows the transformer 2 composed of the first induction winding 2a and the second induction winding 2b. In the circuit device CD illustrated as a third embodiment, the transformer 2 is formed by the first induction winding 2a and the second induction winding 2b, but the transformer 2 and the first induction winding 2a each constitute a circuit as electromagnetically independent inductances. The same applies to the second winding 1b, the third winding 3a, and the fourth winding 3b.

[0053] <Fourth Embodiment> The fourth embodiment is a combination of the first and third embodiments. For the sake of clarity, the magnetic component MC and circuit device CD in the fourth embodiment are denoted by the same reference numerals as the corresponding components in the first embodiment, and detailed descriptions are omitted.

[0054] Figure 25 is a schematic cross-sectional view illustrating an example of a circuit device CD using the magnetic component MC disclosed herein. In the circuit device CD according to the fourth embodiment, the magnetic component MC has a first induction winding 2a wound along the axial direction of a columnar portion 40 which forms the midpoint of the core 4, and a second induction winding 2b wound on the outer circumference of the first induction winding 2a along the axial direction of the columnar portion 40. The first induction winding 2a and the second induction winding 2b form a transformer 2. Furthermore, the magnetic component MC has a thin plate-shaped first winding 1a wound above the transformer 2, a thin plate-shaped first intervening material 1c wound above the first winding 1a, and a thin plate-shaped second winding 1b wound above the first intervening material 1c. The laminated first winding 1a, first intervening material 1c, and second winding 1b form a first non-inductive winding set 1. The first winding 1a and the second winding 1b are connected in series, have the same number of turns, and are wound so that their current flows in opposite directions to cancel out each other's magnetomotive forces. The magnetic component MC is configured such that the magnetic path linked with the first non-inductive winding set 1 does not link with the transformer 2.

[0055] Figure 26 is a circuit diagram showing an example of an equivalent circuit of a part of the magnetic component MC disclosed in this application. Figure 26(a) shows the first winding 1a, and Figure 26(b) shows the transformer 2 composed of the first induction winding 2a and the second induction winding 2b. In the circuit device CD illustrated as the fourth embodiment, the transformer 2 is formed by the first induction winding 2a and the second induction winding 2b, but the transformer 2 and the first winding 1a each constitute a circuit as electromagnetically independent inductances. The same applies to the second winding 1b.

[0056] <Fifth Embodiment> The fifth embodiment is a configuration in which the second embodiment is formed using a thin plate-shaped winding. For the sake of convenience of explanation, the magnetic component MC and circuit device CD according to the fifth embodiment are denoted by the same reference numerals as the corresponding components in the first embodiment, and a detailed explanation is omitted.

[0057] Figure 27 is a schematic cross-sectional view illustrating an example of a circuit device CD using the magnetic component MC disclosed in this application. In the circuit device CD according to the fifth embodiment, the magnetic component MC is divided into upper and lower parts by a gap near the center of the columnar portion 40 which forms the middle leg of the core 4, and thin plate-shaped windings are wound around the upper and lower parts, respectively. In the magnetic component MC, a thin plate-shaped first induction winding 2a is wound around the lower part of the columnar portion 40 of the core 4, and a thin plate-shaped second induction winding 2b is wound above the first induction winding 2a. The stacked first induction windings 2a and second induction windings 2b form a transformer 2. Furthermore, in the magnetic component MC, a thin plate-shaped first winding 1a is wound around the upper part of the columnar portion 40 of the core 4, a thin plate-shaped first interfacing material 1c is wound above the first winding 1a, and a thin plate-shaped second winding 1b is wound above the first interfacing material 1c. The stacked first winding 1a, first interfacing material 1c, and second winding 1b form a first non-inductive winding set 1. The first winding 1a and the second winding 1b are connected in series, have the same number of turns, and are wound so that their current-carrying directions are opposite to cancel each other out in order to cancel out the magnetomotive forces.

[0058] Figure 28 is a circuit diagram showing an example of the equivalent circuit of the magnetic component MC disclosed in this application. Figure 28(a) shows the first winding 1a, and Figure 28(b) shows the first induction winding 2a. In the circuit device CD illustrated as the fifth embodiment, the first winding 1a and the first induction winding 2a constitute a circuit as electromagnetically independent inductances.

[0059] The magnetic component MC related to the circuit device CD exemplified as the fifth embodiment exhibits excellent effects, such as the ability to increase the surface area of ​​the winding by using a thin plate-shaped winding, thereby expanding the area where high-frequency current can be conducted due to the skin effect. Furthermore, because the magnetic component MC has a wide winding, it is possible to reduce the magnetic field applied to the winding, thereby reducing power loss due to the proximity effect caused by the conduction of high-frequency current, among other excellent effects. In other words, the magnetic component MC exhibits excellent effects, such as the ability to reduce power loss called copper loss due to high-frequency operation, while also being able to be miniaturized and increasing versatility.

[0060] <Sixth Embodiment> The sixth embodiment is a configuration in which the first winding 1a and the second winding 1b are stacked in the fifth embodiment. For the sake of convenience of explanation, the magnetic component MC and the circuit device CD according to the sixth embodiment are denoted by the same reference numerals as the corresponding components in the first embodiment, and a detailed explanation is omitted.

[0061] Figure 29 is a schematic cross-sectional view illustrating a partial example of a circuit device CD using the magnetic component MC disclosed herein. Figure 29 schematically shows the first winding 1a, the first intervening material 1c, and the second winding 1b positioned at the top of the columnar portion 40 of the core 4 of the circuit device CD. The magnetic component MC is wound with multiple layers of thin plate-shaped first windings 1a stacked on top of each other, a thin plate-shaped first intervening material 1c wound above the first windings 1a, and multiple layers of thin plate-shaped second windings 1b wound above the first intervening material 1c. The stacked first windings 1a are wound in the same direction so that the direction of current conduction is the same. The same applies to the second windings 1b. The stacked first windings 1a, the first intervening material 1c, and the second windings 1b form a first non-inductive winding set 1. The first winding 1a and the second winding 1b are connected in series, have the same number of turns, and are wound so that their current-carrying directions are opposite to cancel each other out. The first winding 1a and the second winding 1b are formed, for example, on a multilayer substrate such as a double-sided substrate using a winding method such as α-winding.

[0062] <Seventh Embodiment> The seventh embodiment is a configuration in which a thin metal plate is placed between the coil and the non-inductive winding assembly. For the sake of convenience of explanation, the configurations of the magnetic component MC and the circuit device CD according to the seventh embodiment are denoted by the same reference numerals as the corresponding configurations in the first embodiment, and detailed descriptions are omitted.

[0063] Figure 30 is a schematic cross-sectional view illustrating an example of a circuit device CD using the magnetic component MC disclosed herein. Figure 31 is an exploded perspective view showing a partial example of the magnetic component MC disclosed herein. In the circuit device CD according to the seventh embodiment, the magnetic component MC has a first non-inductive winding assembly 1, which is wound around a columnar portion 40 that forms the middle leg of the core 4, with a thin plate-shaped first winding 1a, a first intervening material 1c, and a second winding 1b stacked in that order from top to bottom. Below the first non-inductive winding assembly 1, a first thin metal plate 50 is arranged. As illustrated in Figure 31, the first thin metal plate 50 is formed in a substantially U-shape and is fitted into the columnar portion 40 of the core 4 at the U-shaped recess. Below the second thin metal plate 51, a second thin plate-shaped third winding 3a, a second intervening material 3c, and a fourth winding 3b are formed, stacked in that order from top to bottom, to form a second non-inductive winding assembly 3. Below the second non-inductive winding assembly 3, a second thin metal plate 51 is positioned. The second thin metal plate 51 is formed in a substantially U-shape and is fitted into the columnar portion 40 of the core 4 at the U-shaped recess. Below the second thin metal plate 51, a transformer 2 is formed. In the magnetic component MC according to the seventh embodiment, the windings forming the secondary coil of the transformer 2 are formed by two windings: a second induction winding 2b and a third induction winding 2c. The transformer 2 is formed with the thin plate-shaped second induction winding 2b, the first induction winding 2a, and the third induction winding 2c stacked in this order from top to bottom. The first thin metal plate 50 and the second thin metal plate 51 are formed in a shape that does not link with the magnetic paths formed by the various windings, as described above in a substantially U-shape.

[0064] Figure 32 is a circuit diagram showing an example of the equivalent circuit of the magnetic component MC disclosed in this application. Figure 32(a) shows the first winding 1a, Figure 32(b) shows the third winding 3a, and Figure 32(c) shows the transformer 2 composed of the first induction winding 2a, the second induction winding 2b, and the third induction winding 2c. The first winding 1a, the third winding 3a, and the transformer 2 are electromagnetically independent of each other. The same applies to the second winding 1b and the fourth winding 3b.

[0065] The magnetic component MC of the circuit device CD illustrated as the seventh embodiment exhibits excellent effects, such as the first metal sheet 50 and the second metal sheet 51 functioning as a heat sink (not shown) by connecting them.

[0066] <Eighth Embodiment> The eighth embodiment is a configuration in which the stacking order of the first winding 1a and the second winding 1b constituting the first non-inductive winding set 1, and the third winding 3a and the fourth winding 3b constituting the second non-inductive winding set 3 is changed. For the sake of convenience of explanation, the configurations of the magnetic component MC and the circuit device CD according to the eighth embodiment are denoted by the same reference numerals as the corresponding configurations in the first embodiment, and detailed descriptions are omitted.

[0067] Figure 33 is a schematic cross-sectional view illustrating an example of a circuit device CD using the magnetic component MC disclosed in this application. In the circuit device CD according to the eighth embodiment, the magnetic component MC has a columnar portion 40 which forms the middle leg of the core 4, with a first non-inductive winding set 1 and a second non-inductive winding set 3 formed on the upper side and a transformer 2 formed on the lower side. The first non-inductive winding set 1 and the second non-inductive winding set 3 are wound in a stacked state from top to bottom, consisting of a thin plate-shaped double-layer first winding 1a, a double-layer third winding 3a, a first interfacing material 1c, a double-layer second winding 1b, and a double-layer fourth winding 3b. The first winding 1a and the second winding 1b forming the first non-inductive winding set 1 are connected in series, have the same number of turns, and are wound so that the direction of current flow is opposite to each other in order to cancel out the magnetomotive force. The third winding 3a and the fourth winding 3b, which form the second non-inductive winding set 3, are connected in series, have the same number of turns, and are wound so that their current-carrying directions are opposite to cancel each other out in terms of magnetomotive force. The first non-inductive winding set 1 and the second non-inductive winding set 3 share the first intervening material 1c. The first winding 1a and the third winding 3a have the same current-carrying direction, and the second winding 1b and the fourth winding 3b also have the same current-carrying direction. The first winding 1a, the second winding 1b, the third winding 3a, and the fourth winding 3b are each formed by stacking multiple layers using a winding method such as α winding. The transformer 2 is formed with the thin plate-like first induction winding 2a and the second induction winding 2b stacked in this order from top to bottom.

[0068] Figure 34 is a circuit diagram showing an example of the equivalent circuit of the magnetic component MC disclosed in this application. Figure 34(a) shows a coupled inductor composed of a first winding 1a and a third winding 3a, and Figure 34(b) shows a transformer 2 composed of a first induction winding 2a and a second induction winding 2b. The connection between the first winding 1a and the second winding 1b is configured so that no electromagnetic induction occurs, but the first winding 1a and the third winding 3a can be configured as a coupled inductor that generates electromagnetic induction. The same applies to the connection between the second winding 1b and the fourth winding 3b.

[0069] <Ninth Embodiment> The ninth embodiment is a configuration in which the first non-inductive winding set 1 is formed with three or more windings. For the sake of convenience of explanation, the configurations of the magnetic component MC and the circuit device CD according to the ninth embodiment are denoted by the same reference numerals as the corresponding configurations in the first embodiment, and detailed descriptions are omitted.

[0070] Figure 35 is a schematic cross-sectional view illustrating an example of a circuit device CD using the magnetic component MC disclosed in this application. In the circuit device CD according to the ninth embodiment, the magnetic component MC has a columnar portion 40 which forms the middle leg of the core 4, with a first non-inductive winding set 1 formed on the upper side and a transformer 2 formed on the lower side. The first non-inductive winding set 1 is wound from top to bottom in a stacked state, with a thin plate-shaped first winding 1a, a first intervening material 1c, a second winding 1b, a third intervening material 1e, and a fifth winding 1d. The third intervening material 1e is made of a soft magnetic material. The first winding 1a and the second winding 1b are connected in series, have the same number of turns, and are wound so that the direction of current flow is opposite to cancel out the magnetomotive force. The second winding 1b and the fifth winding 1d are connected in series, have the same number of turns, and are wound so that the direction of current flow is opposite to cancel out the magnetomotive force. Transformer 2 is formed with thin plate-shaped first induction winding 2a and second induction winding 2b stacked in that order from top to bottom. As illustrated in the ninth embodiment, the magnetic component MC disclosed herein can have three or more windings stacked so that the direction of current flow alternately reverses.

[0071] Figure 36 is a circuit diagram showing an example of the equivalent circuit of the magnetic component MC disclosed in this application. Figure 36(a) shows the first winding 1a, and Figure 36(b) shows the transformer 2 composed of the first induction winding 2a and the second induction winding 2b. In the circuit device CD illustrated as the ninth embodiment, the transformer 2 is formed by the first induction winding 2a and the second induction winding 2b, but the transformer 2 and the first winding 1a constitute a circuit as electromagnetically independent inductances. The same applies to the second winding 1b and the third winding 3a.

[0072] As described above, the magnetic component MC disclosed in this application forms a non-inductive winding set with multiple windings wound in opposite directions to cancel each other's magnetomotive forces, and further arranges an inductive winding, with these arranged on the same time path. As a result, the magnetic component MC disclosed in this application has excellent effects, such as being able to achieve miniaturization while suppressing mutual interference. Moreover, the magnetic component MC disclosed in this application has excellent versatility, as it is not limited to a specific circuit and does not use special components.

[0073] The present invention is not limited to the embodiments described above and can be implemented in various other forms. Therefore, the embodiments described above are merely illustrative in all respects and should not be interpreted restrictively. The technical scope of the present invention is described by the claims and is not restricted in any way by the text of the specification. Furthermore, any modifications and changes falling within the equivalent scope of the claims are all within the scope of the present invention.

[0074] For example, although the above embodiment shows a configuration in which a circuit device CD is made using an EE-type core, the circuit device CD disclosed in this application is not limited to this and can be realized in various forms such as a PQ-type core or an EI-type core.

[0075] Furthermore, for example, the first to ninth embodiments can be implemented not only individually, but also in various combinations as appropriate, and can be developed into a variety of forms. [Explanation of symbols]

[0076] MC magnetic components 1. First non-inductive winding assembly (non-inductive winding assembly) 1a First winding (winding) 1b Second winding (winding) 1c 1st intervening material (magnetic material) 1d Fifth winding (winding) 1e Third intervening material (magnetic material) 2 transformers 2a First induction winding (induction winding) 2b Second induction winding (induction winding) 2c Third induction winding (induction winding) 3. Second non-inductive winding assembly (non-inductive winding assembly) 3a Third winding (winding) 3b. Fourth winding (winding) 3c 2nd intervening material (magnetic material) 4 cores 40 Column part 50 1st metal sheet 51 2nd metal thin plate CD circuitry

Claims

1. A non-inductive winding assembly is formed by connecting a pair of windings that are wound so that the current flows in opposite directions to cancel out the magnetomotive forces, Induction windings wound to generate magnetomotive force and Equipped with, The pair of windings included in the aforementioned non-inductive winding assembly are arranged on the same magnetic path. A magnetic component characterized by the following features.

2. The aforementioned non-inductive winding set has the pair of windings connected in series. The pair of windings have the same number of turns, but their winding directions are opposite. The magnetic component according to feature 1.

3. The inductive winding is arranged on the same magnetic path as the non-inductive winding set. A magnetic component according to claim 1 or 2.

4. The pair of windings included in the non-inductive winding assembly are wound in a plate shape and arranged in a stacked manner. A magnetic component according to claim 1 or 2.

5. The system includes multiple non-inductive winding sets, Multiple sets of the non-inductive windings are stacked and arranged so that windings with different winding directions are arranged alternately. The magnetic component according to feature 4.

6. The pair of windings and the induction winding included in the non-inductive winding set are, It is wound in a cylindrical shape around the magnetic path as an axis, They are positioned to overlap radially with the axial magnetic path. A magnetic component according to claim 1 or 2.

7. Furthermore, the non-inductive winding assembly includes a magnetic material interposed between a pair of windings. A magnetic component according to claim 1 or 2.

8. Furthermore, the set includes a core having a columnar portion wound around the pair of windings included in the non-inductive winding assembly. A magnetic component according to claim 1 or 2.

9. A magnetic component as described in claim 1 or claim 2, The non-inductive winding assembly of the aforementioned magnetic component functions as an inductor. The induction winding of the aforementioned magnetic component functions as a transformer. A circuit device characterized by the following features.

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