Flexible magnetic material differential and common mode integrated inductor

Abstract

The utility model relates to a flexible magnetic material differential and common mode integrated inductor which comprises a base, a plurality of coils connected with the base, an annular magnetic core matched with the coils in a sleeving mode and leakage inductance flexible parts arranged on the inner side of the annular magnetic core, the number of the leakage inductance flexible parts is multiple, and the leakage inductance flexible parts correspond to the coils respectively. And an air gap is arranged between every two adjacent leakage inductance flexible parts and is used for generating differential mode inductance for inhibiting differential mode current. A flexible magnetic material differential-mode and common-mode integrated inductor is adopted, and a common-mode inductor and a differential-mode inductor are integrated in one device. The inductor comprises a base, a plurality of coils connected with the base, an annular magnetic core matched with the coils, and a plurality of leakage inductance flexible pieces arranged on the inner side of the annular magnetic core. And an air gap is formed between every two adjacent leakage inductance flexible parts and is used for generating differential mode inductance for inhibiting differential mode current. Through the design, the circuit structure is simplified, the filtering effect is improved, and the material cost and the production cost are reduced.

Description

Technical Field

[0001] The present application relates to the field of differential and common mode integrated inductors, and in particular to a differential and common mode integrated inductor made of flexible magnetic materials. Background Art

[0002] At present, in modern electromagnetic interference (EMI) suppression technology, circuit design often needs to include both differential mode inductors and common mode inductors to suppress differential mode interference and common mode interference respectively. However, differential mode inductors and common mode inductors need to be arranged separately, which not only increases the complexity of the circuit, but also takes up more circuit board space. In addition, the use of separate differential mode and common mode inductors increases the number of components, resulting in an increase in material and production costs. At the same time, separate inductor devices will bring about the problem of poor magnetic coupling in practical applications, affecting the overall filtering effect. Utility Model Content

[0003] In order to solve the problem that differential mode inductors and common mode inductors need to be arranged separately, resulting in increased costs and reduced filtering effects, the present application provides a flexible magnetic material differential and common mode integrated inductor.

[0004] The flexible magnetic material differential common mode integrated inductor provided in the present application adopts the following technical solution:

[0005] A flexible magnetic material differential common mode integrated inductor comprises a base, a plurality of coils connected to the base, an annular magnetic core sleeved with the plurality of coils, and a leakage inductance flexible part arranged on the inner side of the annular magnetic core. A plurality of leakage inductance flexible parts are provided and are respectively arranged corresponding to the coils. An air gap is provided between each two adjacent leakage inductance flexible parts, and the air gap is used to generate a differential mode inductance for suppressing differential mode current.

[0006] By adopting the above technical solution, the leakage inductance of the common-mode inductor is used to generate an appropriate amount of differential-mode inductance, thereby achieving effective suppression of differential-mode current. Traditional filters usually require separate common-mode inductors and differential-mode inductors, which not only increases the complexity of circuit design, but also increases costs. The present application adopts a flexible magnetic material differential common-mode integrated inductor to integrate the common-mode inductor and the differential-mode inductor into one device. It includes a base, a plurality of coils connected to the base, a ring-shaped magnetic core matched with the coil, and a plurality of leakage inductance flexible parts arranged on the inner side of the ring-shaped magnetic core. An air gap is provided between each two adjacent leakage inductance flexible parts to generate a differential-mode inductance that suppresses differential-mode current. Through this design, not only the circuit structure is simplified and the filtering effect is improved, but also the material and production costs are reduced, and the problems of space, cost and filtering effect caused by the separate design of inductor devices in traditional filters are solved.

[0007] Preferably, the leakage inductor flexible member is in an arc shape, the inner circumference of the leakage inductor flexible member is aligned with the coil, and the two ends of the outer circumference of the leakage inductor flexible member are respectively spaced apart from the other leakage inductor flexible members.

[0008] By adopting the above technical solution, the leakage inductance flexible member is in an arc shape and is aligned with the coil, and the two ends of the outer peripheral side are arranged at intervals, which effectively optimizes the magnetic flux distribution and enhances the suppression effect of the differential mode current.

[0009] Preferably, the end surface between the inner circumference and the outer circumference of the leakage inductor flexible member is bonded and matched with the annular magnetic core.

[0010] By adopting the above technical solution, the end surface between the inner circumference and the outer circumference of the leakage inductor flexible member is bonded and matched with the annular magnetic core, which effectively enhances the stability of the structure and the guiding effect of the magnetic flux, and improves the filtering performance of the inductor.

[0011] Preferably, the leakage inductor flexible member comprises a plurality of flexible layers stacked in sequence.

[0012] By adopting the above technical solution, the leakage inductor flexible member includes a plurality of flexible layers stacked in sequence, thereby enhancing the magnetic performance and structural toughness of the leakage inductor flexible member and improving the overall stability and anti-interference ability of the inductor.

[0013] Preferably, the thickness of each flexible layer is 16-20 μm.

[0014] By adopting the above technical solution, the thickness of each flexible layer is 16-20 μm, thereby ensuring the precise magnetic properties and excellent interlayer adhesion of the leakage inductor flexible part, and improving the performance consistency and stability of the inductor.

[0015] Preferably, there are three coils in total, and they are respectively and sequentially sleeved on the annular magnetic core along the circumference of the annular magnetic core, and the angle between every two adjacent coils is 120°.

[0016] By adopting the above technical solution, the technology achieves uniform distribution and effective suppression of electromagnetic interference by sequentially arranging three coils on the annular magnetic core, with an angle of 120° between each two adjacent coils, thereby improving the filtering effect of the inductor.

[0017] Preferably, the base includes a first connecting part arranged corresponding to the annular magnetic core, and a second connecting part integrally connected to the first connecting part in sequence along the circumference of the first connecting part. One end of the coil is connected to the first connecting part, and the other end is connected to the second connecting part after surrounding the annular magnetic core.

[0018] By adopting the above technical solution, this technology connects one end of the coil to the first connecting part of the base, and the other end surrounds the annular magnetic core and is connected to the second connecting part, thereby achieving a firm fixation of the coil and the magnetic core, and providing a conductive path for the coil, thereby effectively improving the stability of the inductance and the filtering effect.

[0019] Preferably, both ends of the second connection part are provided with a yielding arc groove, and the yielding arc groove at one end of the second connection part extends toward the yielding arc groove close to the other end of the second connection part.

[0020] By adopting the above technical solution, the technology sets arc-shaped grooves at both ends of the second connecting part and extends the arc-shaped groove at one end to the other end, thereby minimizing the use of base materials while ensuring the connection strength, thereby reducing production costs.

[0021] Preferably, the annular magnetic core is arranged parallel to the base, and a through hole for placing the leakage inductance flexible member is provided on the inner side of the annular magnetic core, and the through hole is oriented vertically upward.

[0022] By adopting the above technical solution, the technology sets a through hole for placing the leakage inductance flexible part on the inner side of the annular magnetic core, and the through hole faces vertically upward, so that the leakage inductance flexible part can be stably placed inside the magnetic core, thereby improving the coupling effect between the leakage inductance flexible part and the magnetic core and enhancing the filtering characteristics of the inductor.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. In the design of the filter, the present application cleverly utilizes the leakage inductance of the common-mode inductor to generate an appropriate amount of differential-mode inductance, thereby achieving effective suppression of the differential-mode current. Traditional filters usually require separate common-mode inductors and differential-mode inductors, which not only increases the complexity of circuit design, but also increases the cost. The present application adopts a flexible magnetic material differential common-mode integrated inductor to integrate the common-mode inductor and the differential-mode inductor into one device. It includes a base, a plurality of coils connected to the base, a ring-shaped magnetic core matched with the coils, and a plurality of leakage inductance flexible parts arranged on the inner side of the ring-shaped magnetic core. An air gap is provided between each two adjacent leakage inductance flexible parts to generate a differential-mode inductance that suppresses the differential-mode current. Through this design, not only the circuit structure is simplified and the filtering effect is improved, but also the material and production costs are reduced, and the problems of space, cost and filtering effect caused by the separate design of inductor devices in traditional filters are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of an existing inductor in which the leakage inductor flexible part is replaced with a rigid material on the inner side of the annular magnetic core in an embodiment of the present application.

[0026] Figure 2 It is a front view of a flexible magnetic material differential common mode integrated inductor according to an embodiment of the present application.

[0027] Figure 3 It is a top view of a flexible magnetic material differential common mode integrated inductor according to an embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the magnetic flux flow direction when a common-mode signal passes through a differential-common-mode integrated inductor in a flexible magnetic material differential-common-mode integrated inductor according to an embodiment of the present application.

[0029] Figure 5 It is a schematic diagram of the magnetic flux flow direction when a differential-mode signal passes through a differential-common-mode integrated inductor in a flexible magnetic material differential-common-mode integrated inductor according to an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Base; 11. First connecting part; 12. Second connecting part; 13. Yielding arc groove; 2. Coil; 3. Ring core; 31. Through hole; 4. Leakage inductance flexible part; 5. Air gap; 100. Rigid material; 200. Large-mouth-shaped magnetic circuit; 300. Small-mouth-shaped magnetic circuit. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] like Figure 2-3 As shown, a flexible magnetic material differential common mode integrated inductor includes a base 1, a plurality of coils 2 connected to the base 1, an annular magnetic core 3 sleeved with the plurality of coils 2, and a leakage inductance flexible member 4 arranged on the inner side of the annular magnetic core 3, wherein a plurality of leakage inductance flexible members 4 are provided and are respectively arranged corresponding to the coils 2, an air gap 5 is provided between each two adjacent leakage inductance flexible members 4, and the air gap 5 is used to generate a differential mode inductance for suppressing differential mode current.

[0034] The first thing you need to understand is the necessity of common-mode inductors and differential-mode inductors.

[0035] First, common mode inductance: The motherboard inside the computer is a mixture of various high-frequency circuits, digital circuits and analog circuits. When they work, they will generate a large amount of high-frequency electromagnetic waves that interfere with each other. This is EMI. EMI can also be emitted outward through the motherboard wiring or external cables, causing electromagnetic radiation pollution and affecting the normal operation of other electronic equipment.

[0036] The chip on the PC board is both an electromagnetic interference object and an electromagnetic interference source during operation. In general, we can divide these electromagnetic interferences into two categories: series mode interference (differential mode interference) and common mode interference (ground interference). Taking the two PCB traces on the motherboard (the wires connecting the components of the motherboard) as an example, the so-called series mode interference refers to the interference between the two traces; while the common mode interference is the interference caused by the potential difference between the two traces and the PCB ground wire. The series mode interference current acts between the two signal lines, and its conduction direction is consistent with the waveform and signal current; the common mode interference current acts between the signal line and the ground wire, and the interference current flows through half of each of the two signal lines in the same direction, and the ground wire is used as a common loop.

[0037] If the common-mode current generated by the board is not attenuated and filtered (especially the common-mode current on high-speed interface traces such as USB and IEEE 1394 interfaces), the common-mode interference current can easily generate electromagnetic radiation through the interface data line - common-mode radiation generated by the common-mode current in the cable. The US FCC, CISPR22 of the International Special Committee on Radio Interference, and my country's GB9254 and other standards and specifications all have relevant restrictions on the common-mode conducted interference and radiated emissions of the communication ports of information technology equipment. In order to eliminate the interference signals input on the signal line and various induced interferences, we must reasonably arrange the filter circuit to filter the common-mode and series-mode interference. The common-mode inductor is a component of the filter circuit.

[0038] The common-mode inductor is essentially a two-way filter: on the one hand, it filters out common-mode electromagnetic interference on the signal line; on the other hand, it suppresses itself from emitting electromagnetic interference to the outside to avoid affecting the normal operation of other electronic equipment in the same electromagnetic environment.

[0039] Second, differential mode inductance: differential mode inductance is a type of inductance, which is mainly used to suppress differential mode interference. This interference is a non-useful electrical signal transmitted between two wires and is a symmetrical interference. The working principle of differential mode inductance is that after the current flows through the differential mode coil 2, the magnetic flux inside the coil 2 is enhanced, which is equivalent to the sum of the two magnetic fluxes. The characteristic of coil 2 is that the higher the frequency, the greater the impedance. Therefore, the characteristic of high impedance of coil 2 at high frequency is used to attenuate the differential mode signal. When the frequency is 50Hz, the impedance of coil 2 is close to 0, and it has no attenuation effect, which is equivalent to a wire. When the frequency is 500K, the impedance of coil 2 reaches 5K ohms. Assuming that the load impedance is 50 ohms, the differential mode coil 2 divides 99% of the differential mode interference voltage, and the interference voltage on the load is only 1%.

[0040] The main function of differential mode inductors is to suppress high-frequency ripples on PFC. Generally, the switching frequency of PFC is below 150kHz, so we need to suppress frequencies above 150kHz. Many differential mode inductors are wound with toroidal iron powder core materials, and the price of iron powder cores is relatively low. Differential mode inductors are often seen in small and medium power supplies, but many high-power power supplies do not have differential mode inductors. This is because the greater the power, the larger the X capacitor of the input part, and the larger the X capacitor, the smaller the differential mode inductor required.

[0041] In this embodiment, the present application can utilize leakage inductance in the design of the filter. For example, in an ordinary filter, only one common-mode inductor is installed, and the leakage inductance of the common-mode inductor is used to generate an appropriate amount of differential-mode inductance, which plays a role in suppressing the differential-mode current. Sometimes, it is necessary to artificially increase the leakage inductance of the common-mode choke and increase the differential-mode inductance to achieve a better filtering effect. Taking the annular magnetic core 3 as an example to illustrate the magnetic saturation of the differential common-mode inductor, the magnetic saturation of the differential common-mode inductor can be caused by increasing the magnetic permeability of each winding in the middle.

[0042] Preferably, the principle of the differential common mode integrated inductor is that the leakage inductance of the common mode inductor is used as the differential mode inductance of the differential common mode integrated inductor. Taking the primary winding N1 and the secondary winding N2 as an example, the common mode inductor leakage magnetic flux is the magnetic flux generated by N1 without passing through N2 to form a closed loop. The differential common mode inductor is connected in the circuit. When the differential mode signal passes through, the leakage magnetic flux is the net magnetic flux of the differential common mode inductor. The magnetic flux generated by the differential common mode integrated inductor can be regarded as the leakage magnetic flux of the two coils 2. The larger the leakage magnetic flux, the larger the differential mode inductance of the differential common mode integrated inductor;

[0043] When the common mode signal passes through the differential common mode integrated inductor, taking the EE core as an example, Figure 4 As shown, the working condition of the differential common mode inductor is explained by using the air gap in the middle of the EE magnetic core. When the common mode signal passes through the differential common mode integrated inductor, the magnetic resistance is large due to the air gap in the middle column, and the magnetic fluxes generated by N1 and N2 cancel each other in the middle column and superimpose each other in the large mouth-shaped magnetic circuit 200, so the magnetic fluxes of N1 and N2 will not pass through the middle column;

[0044] When the differential mode signal passes through the differential and common mode integrated inductor, taking the EE core as an example, Figure 5As shown, when the differential-mode signal passes through the differential-common-mode integrated inductor, the magnetic flux generated by N1 and N2 will not be offset in the middle column but will pass through the middle column in the same direction. At this time, the large-mouth-shaped magnetic circuit 200 has a smaller magnetic resistance but a longer magnetic circuit; the small-mouth-shaped magnetic circuit 300 is shorter but has a larger magnetic resistance due to the open middle column air gap. If the middle column air gap is opened larger, the magnetic flux passing through the middle column is smaller, the leakage magnetic flux of the differential common-mode inductor is smaller, and the differential-mode inductance of the differential common-mode inductor is smaller; if the middle column air gap is opened smaller, the magnetic flux passing through the middle column is larger, the leakage magnetic flux of the differential common-mode inductor is larger, and the differential-mode inductance of the differential common-mode inductor is larger. Therefore, the differential-mode inductance of the differential common-mode integrated inductor can be adjusted by controlling the size of the middle column air gap.

[0045] Therefore, the EE core is used as an example to explain the magnetic saturation of differential and common mode inductors. Both the large-mouth core and the middle-column core can cause magnetic saturation of differential and common mode integrated inductors.

[0046] Since the big-mouthed core is the main magnetic circuit of the common-mode inductor, high magnetic permeability materials are generally used. Since the middle column core is the magnetic circuit of the leakage flux and the leakage flux of N1 and N2 passes through the middle column, high Bs materials are generally used for the middle column. When the differential-mode signal passes through the differential-common-mode integrated inductor:

[0047] Since the wide-mouthed magnetic core is made of high magnetic permeability material, when the leakage flux is large and the B obtained by dividing the leakage flux by the cross-sectional area is greater than the Bs of the high magnetic permeability material, the wide-mouthed magnetic core will be saturated.

[0048] Since the middle column bears the leakage flux of the sum of N1 and N2, if the cross-sectional area of ​​the middle column is selected to be smaller, or the air gap is smaller, the core of the middle column will also be saturated.

[0049] However, if Figure 1As shown, in the inner side of the existing annular magnetic core 3, the leakage inductance flexible part 4 replaces the rigid material 100, and this rigid material cannot produce the middle column gap for generating the differential mode inductance for suppressing the differential mode current, and even cannot properly adjust the size of the middle column gap to achieve the differential mode inductance of the differential common mode integrated inductor by controlling the size of the air gap 5. In the present application, the flexible magnetic material differential common mode integrated inductor achieves its technical effect through the coordinated work of structural parts including a base 1, a plurality of coils 2 connected to the base 1, an annular magnetic core 3 sleeved with these coils 2, and a plurality of leakage inductance flexible parts 4 arranged on the inner side of the annular magnetic core 3. Among them, the base 1 is used as a supporting structure to fix and connect other components; multiple coils 2 are wound on the annular core 3 to generate an electromagnetic field and are connected to the base 1 to ensure the stable flow of current; the annular core 3 is made of magnetic material and is used to concentrate and enhance the electromagnetic field generated by the coil 2 to achieve the differential common mode filtering function; and the leakage inductance flexible part 4 is arranged on the inner side of the annular core 3 and corresponds to the coil 2, and an air gap 5 is arranged between each two adjacent leakage inductance flexible parts 4 to generate a differential mode inductance to suppress the differential mode current. When the current passes through the coil 2, the annular core 3 will concentrate the electromagnetic field, and the leakage inductance flexible part 4 will adjust the magnetic field distribution inside the core through the setting of the air gap 5, so as to generate an appropriate amount of differential mode inductance while suppressing the common mode current, so as to achieve the effect of differential common mode filtering.

[0050] In summary, the leakage inductance of the common-mode inductor is used to generate an appropriate amount of differential-mode inductance, thereby achieving effective suppression of the differential-mode current. Traditional filters usually require separate common-mode inductors and differential-mode inductors, which not only increases the complexity of circuit design, but also increases costs. The present application adopts a flexible magnetic material differential common-mode integrated inductor to integrate the common-mode inductor and the differential-mode inductor into one device. It includes a base 1, a plurality of coils 2 connected to the base 1, an annular magnetic core 3 matched with the coil 2, and a plurality of leakage inductance flexible parts 4 arranged on the inner side of the annular magnetic core 3. An air gap 5 is provided between each two adjacent leakage inductance flexible parts 4 to generate a differential-mode inductance that suppresses the differential-mode current. Through this design, not only the circuit structure is simplified and the filtering effect is improved, but also the material and production costs are reduced, and the problems of space, cost and filtering effect caused by the separation design of inductor devices in traditional filters are solved.

[0051] Further, such as Figure 3 As shown, the leakage inductor flexible member 4 is in an arc shape, the inner circumference of the leakage inductor flexible member 4 is aligned with the coil 2 , and the two ends of the outer circumference of the leakage inductor flexible member 4 are respectively spaced apart from other leakage inductor flexible members 4 .

[0052] In this embodiment, in this technology, the leakage inductance flexible part 4 is designed to be in an arc shape, with its inner circumference aligned with the coil 2, and the two ends of the outer circumference are spaced apart from other leakage inductance flexible parts 4. This structural design can form a good magnetic coupling between the leakage inductance flexible part 4 and the coil 2, thereby enhancing the concentration and enhancement effect of the magnetic field. At the same time, due to the spacing of the outer circumference of the leakage inductance flexible part 4, air gaps 5 are formed between adjacent leakage inductance flexible parts 4. These air gaps can generate differential mode inductance that suppresses differential mode current while suppressing common mode current. In this way, the leakage inductance flexible part 4 works in coordination with structural parts such as the coil 2 and the annular magnetic core 3 to achieve effective suppression of differential mode and common mode currents, thereby improving the filtering effect of the inductance.

[0053] In summary, the leakage inductance flexible member 4 is in an arc shape and is aligned with the coil 2, and the two ends of the outer circumference are arranged at intervals, which effectively optimizes the magnetic flux distribution and enhances the suppression effect of the differential mode current.

[0054] Further, such as Figure 3 As shown, the end surface between the inner circumference and the outer circumference of the leakage inductor flexible member 4 is bonded and matched with the annular magnetic core 3 .

[0055] In this embodiment, the technology achieves a firm connection between the leakage inductance flexible part 4 and the annular magnetic core 3 by bonding the end face between the inner and outer sides of the leakage inductance flexible part 4 with the annular magnetic core 3. The function of the leakage inductance flexible part 4 is to adjust the magnetic field distribution inside the annular magnetic core 3 so that it can generate an appropriate amount of differential mode inductance (i.e., the current direction in the two coils 2 is opposite) while suppressing the common mode current (i.e., the current direction in the two coils 2 is the same). When the current passes through the coil 2, the annular magnetic core 3 will concentrate the electromagnetic field, and the leakage inductance flexible part 4 will change the magnetic flux path through its adhesion with the magnetic core, so that the magnetic field presents a high impedance under the common mode current, thereby suppressing the common mode interference. At the same time, the setting of the leakage inductance flexible part 4 can also increase the leakage inductance of the inductor, improve the ability to suppress the differential mode current, and thus achieve better differential mode and common mode filtering effects. This structural design can effectively improve the filtering characteristics of the inductor, so that it can play a better electromagnetic compatibility performance in electronic equipment.

[0056] In summary, the end surface between the inner circumference and the outer circumference of the leakage inductor flexible member 4 is bonded and matched with the annular magnetic core 3, which effectively enhances the stability of the structure and the guiding effect of the magnetic flux, and improves the filtering performance of the inductor.

[0057] Furthermore, the leakage inductor flexible member 4 includes a plurality of flexible layers stacked in sequence.

[0058] In this embodiment, in this technology, the leakage inductance flexible part 4 is formed by stacking a plurality of flexible layers in sequence. This structural design can increase the thickness and elasticity of the leakage inductance flexible part 4, so that it has better adaptability and stability in the adhesion cooperation with the annular magnetic core 3. The stacking of multiple flexible layers can also increase the inductance of the leakage inductance flexible part 4, thereby improving the ability to suppress differential mode current. When current passes through the coil 2, the annular magnetic core 3 will concentrate the electromagnetic field, and the leakage inductance flexible part 4 will adjust the magnetic flux path through the flexible layer inside it, so that the magnetic field presents high impedance under common mode current, thereby suppressing common mode interference. At the same time, due to the elasticity and adaptability of the leakage inductance flexible part 4, it can also automatically adjust the magnetic flux path according to the change of current, so that the inductor can maintain a good filtering effect under various working conditions. This structural design can effectively improve the reliability and performance of the inductor, so that it is widely used in various electronic devices.

[0059] In summary, the leakage inductor flexible member 4 includes a plurality of flexible layers stacked in sequence, thereby enhancing the magnetic performance and structural toughness of the leakage inductor flexible member 4 and improving the overall stability and anti-interference capability of the inductor.

[0060] Furthermore, the thickness of each flexible layer is 16-20 μm.

[0061] In this embodiment, in this technology, the thickness of each flexible layer is set to 16-20μm. This thickness range can ensure that the leakage inductance flexible part 4 has appropriate elasticity and strength to realize its function in the inductor structure. Specifically, the appropriate thickness enables the flexible layer to be firmly adhered to the annular core 3, and to undergo appropriate deformation when current passes through, thereby adjusting the magnetic flux path. When multiple flexible layers are stacked in sequence, they together constitute the leakage inductance flexible part 4, which can provide sufficient inductance to suppress differential mode currents. At the same time, since the tiny gaps between the flexible layers form an air gap 5, the suppression effect on differential mode currents is further enhanced. Therefore, by setting the thickness of the flexible layer to 16-20μm and linking it with other structural parts, this technology can achieve effective suppression of differential and common mode currents and improve the filtering effect of the inductor;

[0062] Preferably, the material composition of the flexible layer is (FeM)73.5Cu1Nb3(SiB)22.5, and the material properties are saturation magnetic induction intensity: >Bs:1.25T; initial magnetic permeability: u:>80000@50Hz; Curie temperature: Tc: 560℃; material thickness: 16~20μm; operating temperature: -30℃~200℃;

[0063] In summary, the thickness of each flexible layer is 16-20 μm, thereby ensuring the precise magnetic properties and excellent interlayer adhesion of the leakage inductor flexible member 4 and improving the performance consistency and stability of the inductor.

[0064] Further, such as Figure 1-3 As shown, there are three coils 2 in total, and they are respectively sleeved on the annular magnetic core 3 in sequence along the circumference of the annular magnetic core 3 , and the angle between every two adjacent coils 2 is 120°.

[0065] In this embodiment, in this technology, there are three coils 2, which are sequentially sleeved on the magnetic core along the circumference of the annular magnetic core 3, and are arranged at 120° between each two adjacent coils 2. This structural design enables the three coils 2 to be evenly distributed on the magnetic core, thereby achieving comprehensive suppression of electromagnetic interference. When current passes through the coil 2, a magnetic field is generated, and the function of the annular magnetic core 3 is to gather and enhance these magnetic fields so that they form a closed magnetic flux path inside the magnetic core. Since the angle between two adjacent coils 2 is 120°, the magnetic fields they generate are superimposed on each other inside the magnetic core to form a uniform magnetic field distribution. This uniform magnetic field distribution can effectively suppress common mode current (i.e., the current directions in the two coils 2 are the same) and differential mode current (i.e., the current directions in the two coils 2 are opposite), thereby improving the filtering effect of the inductor. In addition, due to the uniform distribution of the coils 2, the impact of electromagnetic interference on other circuit elements can also be reduced, and the stability and reliability of the entire circuit system can be improved.

[0066] In summary, this technology achieves uniform distribution and effective suppression of electromagnetic interference by sequentially arranging three coils 2 on the annular magnetic core 3, with an angle of 120° between every two adjacent coils 2, thereby improving the filtering effect of the inductor.

[0067] Further, such as Figure 1-3 As shown, the base 1 includes a first connecting portion 11 corresponding to the annular magnetic core 3, and a second connecting portion 12 integrally connected to the first connecting portion 11 in sequence along the circumference of the first connecting portion 11. One end of the coil 2 is connected to the first connecting portion 11, and the other end is connected to the second connecting portion 12 after surrounding the annular magnetic core 3.

[0068] In this embodiment, in this technology, the base 1 includes a first connection portion 11 corresponding to the annular magnetic core 3 and a second connection portion 12 integrally connected to the first connection portion 11 in sequence along the circumference of the first connection portion 11. This structural design enables the base 1 to be firmly connected to the annular magnetic core 3 and provide a stable support and fixing platform. One end of the coil 2 is connected to the first connection portion 11, and the other end is connected to the second connection portion 12 after surrounding the annular magnetic core 3. This connection method can ensure that the current flows in from one end of the coil 2, passes through the magnetic flux path inside the annular magnetic core 3, and then flows out from the other end of the coil 2 to form a complete electromagnetic loop. In this way, the annular magnetic core 3 can effectively concentrate and enhance the magnetic field generated by the coil 2, and improve the inductance and filtering effect of the inductor. At the same time, due to the integrated connection between the coil 2 and the base 1, it can also reduce the impact of electromagnetic interference on other circuit elements and improve the stability and reliability of the circuit system.

[0069] In summary, this technology achieves a firm fixation of the coil 2 and the magnetic core by connecting one end of the coil 2 to the first connecting part 11 of the base 1 and the other end of the coil 2 around the annular magnetic core 3 and then connected to the second connecting part 12, and provides a conductive path for the coil 2, thereby effectively improving the stability of the inductance and the filtering effect.

[0070] Further, such as Figure 1-3 As shown, both ends of the second connection portion 12 are provided with a yielding arc groove 13 , and the yielding arc groove 13 at one end of the second connection portion 12 extends toward the yielding arc groove 13 close to the other end of the second connection portion 12 .

[0071] In this embodiment, in this technology, the give-way arc grooves 13 provided at both ends of the second connection part 12 enable the second connection part 12 to have a certain elastic deformation ability. When one end of the coil 2 is connected to the second connection part 12 after wrapping around the annular magnetic core 3, the give-way arc groove 13 can provide a certain space so that the connection end of the coil 2 can smoothly contact and fix with the second connection part 12. This structural design can not only ensure the stable connection between the coil 2 and the base 1, but also provide a certain connection length to accommodate coils 2 of different sizes. At the same time, due to the presence of the give-way arc groove 13, the second connection part 12 also has a certain self-adjustment ability, and can be adaptively adjusted according to the size and shape of the coil 2, thereby improving the reliability and stability of the connection. In addition, the extended design of the give-way arc groove 13 can also increase the strength and rigidity of the second connection part 12, making it less likely to deform when subjected to external forces, further improving the stability and reliability of the overall structure.

[0072] In summary, this technology achieves the goal of minimizing the use of base 1 materials while ensuring connection strength by providing arc-shaped grooves 13 at both ends of the second connection portion 12 and extending the arc-shaped groove 13 at one end to the other end, thereby reducing production costs.

[0073] Further, such as Figure 1-2 As shown, the annular magnetic core 3 is arranged parallel to the base 1 , and a through hole 31 for placing the leakage inductance flexible member 4 is provided on the inner side of the annular magnetic core 3 , and the through hole 31 is oriented vertically upward.

[0074] In this embodiment, in this technology, the annular magnetic core 3 is arranged parallel to the base 1, and a through hole 31 for placing the leakage inductance flexible part 4 is provided on the inner side of the annular magnetic core 3, and the through hole 31 faces vertically upward. This structural design enables the leakage inductance flexible part 4 to be stably placed inside the annular magnetic core 3, and the contact area with the magnetic core is large, so that the magnetic field distribution inside the magnetic core can be effectively adjusted. When the current passes through the coil 2, the annular magnetic core 3 will gather and enhance the magnetic field, and the leakage inductance flexible part 4 will change the path and distribution of the magnetic field through its interaction with the magnetic core, so that it can suppress the common mode current while generating an appropriate amount of differential mode inductance. Since the through hole 31 faces vertically upward, the leakage inductance flexible part 4 will not be offset by the influence of gravity when placed, thereby ensuring its stable contact with the magnetic core and the magnetic field adjustment effect. This structural design can improve the filtering performance of the inductor and enable it to maintain stable electromagnetic characteristics under various working conditions.

[0075] In summary, this technology sets a through hole 31 for placing the leakage inductance flexible part 4 on the inner side of the annular magnetic core 3, and the through hole 31 faces vertically upward, so that the leakage inductance flexible part 4 can be stably placed inside the magnetic core, thereby improving the coupling effect between the leakage inductance flexible part 4 and the magnetic core, and enhancing the filtering characteristics of the inductor.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flexible magnetic material differential common mode integrated inductor, characterized in that: The invention comprises a base (1), a plurality of coils (2) connected to the base (1), an annular magnetic core (3) sleeved and matched with the plurality of coils (2), and a leakage inductance flexible member (4) arranged inside the annular magnetic core (3); a plurality of leakage inductance flexible members (4) are provided and are respectively arranged corresponding to the coils (2); an air gap (5) is provided between each two adjacent leakage inductance flexible members (4); the air gap (5) is used to generate a differential mode inductance for suppressing differential mode current.

2. The flexible magnetic material differential common mode integrated inductor according to claim 1, characterized in that: The leakage inductance flexible member (4) is in an arc shape, the inner circumference of the leakage inductance flexible member (4) is aligned with the coil (2), and the two ends of the outer circumference of the leakage inductance flexible member (4) are respectively arranged at intervals from other leakage inductance flexible members (4).

3. The flexible magnetic material differential common mode integrated inductor according to claim 2, characterized in that: The end surface between the inner circumference and the outer circumference of the leakage inductance flexible member (4) is bonded and matched with the annular magnetic core (3).

4. The flexible magnetic material differential common mode integrated inductor according to claim 1, characterized in that: The leakage inductor flexible member (4) comprises a plurality of flexible layers stacked in sequence.

5. The flexible magnetic material differential common mode integrated inductor according to claim 4, characterized in that: The thickness of each of the flexible layers is 16-20 μm.

6. The flexible magnetic material differential common mode integrated inductor according to claim 1, characterized in that: There are three coils (2) in total, which are respectively sleeved on the annular magnetic core (3) in sequence along the circumference of the annular magnetic core (3), and each adjacent two coils (2) are arranged at an angle of 120°.

7. The flexible magnetic material differential common mode integrated inductor according to claim 1, characterized in that: The base (1) comprises a first connection portion (11) arranged corresponding to the annular magnetic core (3), and a second connection portion (12) integrally connected to the first connection portion (11) in sequence along the circumference of the first connection portion (11); one end of the coil (2) is connected to the first connection portion (11), and the other end is connected to the second connection portion (12) after surrounding the annular magnetic core (3).

8. The flexible magnetic material differential common mode integrated inductor according to claim 7, characterized in that: Both ends of the second connecting portion (12) are provided with a clearance arc groove (13), and the clearance arc groove (13) at one end of the second connecting portion (12) extends towards the clearance arc groove (13) close to the other end of the second connecting portion (12).

9. The flexible magnetic material differential common mode integrated inductor according to claim 1, characterized in that: The annular magnetic core (3) is arranged parallel to the base (1), and a through hole (31) for placing the leakage inductance flexible member (4) is provided on the inner side of the annular magnetic core (3), and the through hole (31) is oriented vertically upward.

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