Inductor unit for switching power supply circuit, switching power supply circuit, and electronic device

Abstract

The application relates to the technical field of electronic equipment, and discloses an inductance unit for a switching power supply circuit, a switching power supply circuit and electronic equipment. The inductance unit comprises a first inductance and a second inductance. The first inductance comprises a first coil. The second inductance is connected in parallel with the first inductance, and the second inductance comprises a second coil. The first coil has a first winding direction, the second coil has a second winding direction, the first winding direction is opposite to the second winding direction, the first inductance has a first inductance value, the second inductance has a second inductance value, and the first inductance value is the same as the second inductance value. The inductance unit disclosed by the application reduces radiation emission.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and in particular to an inductor unit for a switching power supply circuit, a switching power supply circuit, and an electronic device. Background Technology

[0002] In switching power supplies, power inductors are key energy storage and conversion devices. When a power inductor is working, the current flowing through it is chopped at a high frequency, and the voltage across it has an extremely high rate of change, making the power inductor a major source of radiation emission in the switching power supply circuit.

[0003] With the increasing operating frequency of electronic devices and the increasingly stringent requirements for radiated emissions, excessive radiated emissions caused by power inductors have become a common and challenging design problem. Therefore, how to reduce the radiated emissions of electronic devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides an inductor unit, a switching power supply circuit, and an electronic device for a switching power supply circuit. The inductor unit according to this application reduces radiated emissions.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include: In a first aspect, embodiments of this application provide an inductor unit for a switching power supply circuit, including a first inductor and a second inductor; the first inductor includes a first coil; the second inductor is connected in parallel with the first inductor and includes a second coil; wherein the first coil has a first winding direction, the second coil has a second winding direction, and the first winding direction and the second winding direction are opposite; the first inductor has a first inductance value, the second inductor has a second inductance value, and the first inductance value and the second inductance value are the same.

[0006] According to the first aspect of this application, an inductor unit for a switching power supply circuit is provided. Since the winding direction of the first coil is opposite to that of the second coil, when current flows through the first and second inductors connected in parallel, the magnetic fields generated by the first and second inductors are in opposite directions. Since the values ​​of the first and second inductors are the same, the current magnitudes in the first and second coils are equal, and the magnetic field strengths generated are equal. When the magnetic fields generated by the first and second inductors are spatially coupled, they can superimpose and cancel each other out, thereby weakening the radiation emitted by the inductor unit from the source, reducing electromagnetic interference to other components of electronic equipment, and reducing the probability of radiated emissions exceeding standard limits.

[0007] Optionally, a center line of symmetry is provided between the axis of the first coil and the axis of the second coil, and the first coil and the second coil are symmetrical about the center line of symmetry.

[0008] In the above scheme, the magnetic field generated by the first coil and the magnetic field generated by the second coil can be symmetrically superimposed, avoiding insufficient cancellation of local magnetic fields due to misalignment of the first coil and the second coil. This can further weaken the radiation emitted by the inductor unit, reduce electromagnetic interference to other components of electronic equipment, reduce the probability of radiated emissions exceeding standard limits, and make it easier to meet stringent radiated emission standards.

[0009] Optionally, the number of turns of the first coil is the same as the number of turns of the second coil.

[0010] In the above scheme, the number of turns is the core parameter that determines the inductance value. The inductance value is positively correlated with the square of the number of turns. The fact that the number of turns of the first coil and the number of turns of the second coil are the same can ensure that the inductance values ​​of the first inductor and the second inductor are the same. At the same time, it reduces the occurrence of different magnetic field distributions due to different numbers of turns and improves the cancellation effect after the magnetic field spatial coupling.

[0011] Optionally, the first coil has a first projection along the axis of the first coil, and the second coil has a second projection along the axis of the second coil, wherein the areas of the first projection and the second projection are equal.

[0012] In the above scheme, the magnetic fields of the first coil and the second coil can be more symmetrical in spatial distribution, so that the effective magnetic fields of the first coil and the second coil are closer in coverage and magnetic field strength distribution, preventing the occurrence of magnetic field cancellation blind zone and further reducing the radiation leakage of the inductor unit. Optionally, both the first coil and the second coil are constructed as a spiral structure, with the first winding direction being clockwise and the second winding direction being counterclockwise.

[0013] In the above scheme, when current passes through the two coils connected in parallel, the clockwise spiral coil generates a directional magnetic field along the axis, while the counterclockwise spiral coil generates a magnetic field in the completely opposite direction. Due to the magnetic field concentration of the spiral structure, the two can form efficient coupling in space. The opposing and equally strong magnetic fields can be superimposed and canceled in the overlapping area, which greatly reduces the magnetic field interference radiated outward by the inductor unit. This reduces the risk of the switching power supply exceeding the EMC standard limit due to inductor radiation and avoids magnetic field leakage that interferes with surrounding sensitive components.

[0014] Secondly, embodiments of this application provide a switching power supply circuit, including: the inductor unit described in any of the embodiments.

[0015] According to the switching power supply circuit proposed in the second aspect of this application, since it has the inductor unit described in any embodiment, it can weaken the radiation emitted by the inductor unit from the source, reduce electromagnetic interference to other components of electronic equipment, and reduce the probability of radiated emissions exceeding the standard limit. At the same time, it does not require changing the power supply topology, nor does it require the introduction of active devices or complex control. It is easy to design and implement, has good compatibility, and is easy to apply quickly on existing product platforms.

[0016] Optionally, the switching power supply circuit further includes a first diode, a first MOSFET, and a first capacitor. One side of the first diode is connected to one side of the inductor unit, and the other side of the first diode is connected to one side of the first capacitor. The source of the first MOSFET is connected to a voltage source, the drain of the first MOSFET is connected to one side of the inductor unit, and the other side of the first capacitor is connected to the other side of the inductor unit.

[0017] In the above scheme, the entire circuit can both reduce the input voltage to a lower output voltage and weaken the radiation emitted by the inductor unit from the source, thereby reducing electromagnetic interference to other components of the electronic equipment and lowering the probability of radiated emissions exceeding the standard limit.

[0018] Optionally, the switching power supply circuit further includes a second diode, a second MOSFET, and a second capacitor. One side of the inductor unit is connected to the voltage source, the other side of the inductor unit is connected to the source of the second MOSFET, the drain of the second MOSFET is connected to one side of the second capacitor, one side of the second diode is connected to the other side of the inductor unit, and the other side of the second diode is connected to the other side of the second capacitor.

[0019] In the above scheme, the entire circuit can both boost the input voltage and reduce the radiation emitted by the inductor unit from the source, thereby reducing electromagnetic interference to other components of the electronic equipment and lowering the probability of radiated emissions exceeding the standard limits.

[0020] Optionally, the switching power supply circuit further includes a third diode, a third MOSFET, and a third capacitor. The source of the third MOSFET is connected to a voltage source, the drain of the third MOSFET is connected to one side of an inductor unit, the other side of the inductor unit is connected to one side of the third capacitor, the other side of the third capacitor is connected to one side of the third diode, and the other side of the third diode is connected to one side of the inductor unit.

[0021] In the above scheme, the entire circuit can adjust the input voltage to be higher or lower than the output voltage, and can also reduce the radiation emitted by the inductor unit from the source, reduce electromagnetic interference to other components of electronic equipment, and reduce the probability of radiated emissions exceeding the standard limit.

[0022] Thirdly, embodiments of this application provide an electronic device including an inductor unit as described in any embodiment or a switching power supply circuit as described in any embodiment.

[0023] The electronic device proposed according to the third aspect of this application, having an inductor unit or a switching power supply circuit as described in any embodiment, can weaken the radiation emitted by the inductor unit from the source, reduce electromagnetic interference to other components of the electronic device, and reduce the probability of radiated emissions exceeding standard limits. At the same time, it does not require changing the power supply topology, nor does it require introducing active devices or complex control, making it easy to design and implement and with good compatibility. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the inductor unit in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of the inductor unit in some other embodiments of this application; Figure 3 This is a schematic diagram of the switching power supply circuit in some other embodiments of this application; Figure 4 This is a schematic diagram of the switching power supply circuit in some other embodiments of this application; Figure 5 This is a schematic diagram of the switching power supply circuit in some other embodiments of this application.

[0026] [Explanation of Labels in the Attached Image] 100. Inductor unit; 110. First inductor; 111. First coil; 112. First electrode; 113. Second electrode; 114. First powder; 120. Second inductor; 121. Second coil; 122. Third electrode; 123. Fourth electrode; 124. Second powder; 200. Switching power supply circuit; 211. First diode; 212. Second diode; 213. Third diode; 221. First MOSFET; 222. Second MOSFET; 223. Third MOSFET; 231. First capacitor; 232. Second capacitor; 233. Third capacitor; Y, the center line of symmetry; A, the first winding direction; B, the second winding direction. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0029] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0033] In switching power supply topologies such as Buck, Boost, and Buck-Boost, the power inductor is a key energy storage and conversion device. During operation, the current flowing through the inductor is chopped at a high frequency, and the voltage across its terminals has an extremely high rate of change, making the power inductor a major source of radiation emission in the switching power supply circuit.

[0034] With the increasing operating frequency of electronic devices and the increasingly stringent requirements for radiated emissions, excessive radiated emissions caused by power inductors have become a common and challenging design problem.

[0035] In related technologies, a magnetically conductive or electrically conductive metal shield made of materials such as nickel silver or stainless steel is installed above the switching power supply circuit or power inductor. This shield is fixed to the circuit board by welding or clipping and is well connected to the system's ground plane. The metal shield forms a Faraday cage; the high-frequency alternating magnetic field induces eddy currents within the shield. The magnetic field generated by these eddy currents is opposite in direction to the source magnetic field, thus canceling out and absorbing most of the magnetic field lines leaking to the outside, effectively suppressing radiated emissions.

[0036] The existing technology has the following drawbacks: 1. The additional metal shielding cover itself incurs material costs and requires additional installation processes (such as welding or mechanical fixing), increasing production costs. 2. Large space occupation: The shielding cover needs a certain height to accommodate the inductor, occupying vertical space in the Z direction, and also requiring space in the XY direction for mounting on the circuit board, which contradicts the design trend of lightweight and small-area electronic products. 3. Increased weight: The metal shielding cover increases the overall weight of the product. 4. Impaired heat dissipation: The shielding cover encloses the inductor, hindering its heat dissipation through air convection, which may lead to increased inductor and operating environment temperatures, affecting thermal performance. 5. Design complexity: The shielding cover requires the design of fixed pads or clip structures, increasing the complexity of PCB layout and structural design.

[0037] Therefore, how to reduce the radiation emissions of electronic devices is a technical problem that urgently needs to be solved.

[0038] In view of this, in order to reduce the radiation emissions of electronic devices, this application proposes an inductor unit 100 for a switching power supply circuit 200. A first inductor 110 includes a first coil 111; a second inductor 120 is connected in parallel with the first inductor 110 and includes a second coil 121; wherein the first coil 111 has a first winding direction A, and the second coil 121 has a second winding direction B, the first winding direction A and the second winding direction B being opposite; the first inductor 110 has a first inductance value, and the second inductor 120 has a second inductance value, the first inductance value and the second inductance value being the same; due to the winding direction of the first coil 111... Since the winding direction of the first inductor 110 is opposite to that of the second coil 121, when current flows through the parallel first inductor 110 and second inductor 120, the magnetic fields generated by the first inductor 110 and the second inductor 120 are in opposite directions. And because the values ​​of the first inductance and the second inductance are the same, the current in the first coil 111 and the second coil 121 are equal in magnitude, and the magnetic field strength generated is equal. When the magnetic field generated by the first inductor 110 and the magnetic field generated by the second inductor 120 are coupled in space, they can superimpose and cancel each other out, thereby weakening the radiation emitted by the inductor unit 100 from the source, reducing electromagnetic interference to other components of electronic equipment, and reducing the probability of radiation emission exceeding the standard limit.

[0039] An inductor unit 100 for a switching power supply circuit 200, as proposed in this application, is described below with reference to the accompanying drawings.

[0040] Please refer to Figure 1 , Figure 2 and Figure 3 An inductor unit 100 for a switching power supply circuit 200 according to a first aspect embodiment of the present application includes a first inductor 110 and a second inductor 120.

[0041] The first inductor 110 includes a first coil 111; the second inductor 120 is connected in parallel with the first inductor 110, and the second inductor 120 includes a second coil 121; the first inductor 110 and the second inductor 120 can be surface mount inductors, I-beam inductors, or other types of inductors, and this application does not limit them. At the same time, the first inductor 110 and the second inductor 120 can be wire wound or integrally molded, and this application does not limit them.

[0042] The first coil 111 has a first winding direction A, and the second coil 121 has a second winding direction B. The first winding direction A and the second winding direction B are opposite. Understandably, when current flows through the coils of two parallel inductors, the opposite winding directions will cause the first coil 111 and the second coil 121 to generate magnetic fields in opposite directions. For example, the magnetic field generated by the first coil 111 is upward, and the magnetic field generated by the second coil 121 is downward. The two fields weaken or cancel each other out in space. This reduces the magnetic field radiation of the inductor unit 100 at the source, lowers the risk of excessive radiation in the switching power supply due to the magnetic field radiation of the inductor, and prevents magnetic field leakage from interfering with the normal operation of surrounding electronic components.

[0043] Furthermore, this design eliminates the need for additional structures such as metal shielding covers, simplifying circuit design, reducing material costs, and minimizing installation space requirements while achieving radiation suppression.

[0044] The first inductor 110 has a first inductance value, and the second inductor 120 has a second inductance value, with the first and second inductance values ​​being the same. That is, the impedance of the first inductor 110 is the same as the impedance of the second inductor 120. When the current in the circuit passes through the inductor unit 100, it is evenly distributed between the first inductor 110 and the second inductor 120. This even distribution of current results in equal magnetic field strengths generated by the first coil 111 and the second coil 121. When the magnetic fields generated by the first inductor 110 and the second inductor 121 are spatially coupled, they can superimpose and cancel each other out.

[0045] This configuration helps reduce the chance of incomplete cancellation due to inconsistent magnetic field strength, resulting in residual radiation. It also helps ensure reliable circuit performance. Equal inductance values ​​make the total inductance after parallel connection stable and controllable. For example, if the value of a single inductor is 2L, the total inductance after parallel connection is L, which reduces the fluctuation of the total inductance caused by differences in inductance values, thereby affecting the filtering effect of the switching power supply, ensuring voltage stability, and ensuring that the switching power supply is always in a stable working state.

[0046] On the other hand, the first inductor 110 and the second inductor 120 are connected in parallel with the same inductance value. This ensures that the total inductance meets the filtering and energy storage requirements of the switching power supply circuit 200. The total inductance is stable after being connected in parallel and does not affect the normal operating parameters of the circuit. It also improves the current carrying capacity of the inductor unit 100 by current shunting, avoiding the heat generation or performance degradation of a single inductor due to excessive current. At the same time, radiation suppression can be achieved without the need for additional shielding structures (such as metal shielding covers), simplifying circuit design, reducing costs, avoiding the need for shielding covers, and facilitating inductor heat dissipation.

[0047] Specifically, the first inductor 110 and the second inductor 120 can be two inductors that are spaced apart on the circuit board and connected in parallel. The distance between the first inductor 110 and the second inductor 120 can be adaptively adjusted according to the inductance value. However, it is understood that the first inductor 110 and the second inductor 120 must be adjacent to the circuit board so that the magnetic fields generated by them can cancel each other out.

[0048] Specifically, the first inductor 110 also includes a first electrode 112, a second electrode 113, a first housing, and a first powder 114. The first coil 111 is disposed inside the first housing, which is filled with the first powder 114. One side of the first electrode 112 is disposed on the outer side of the first housing, and the other side of the first electrode 112 extends into the first housing and is connected to one side of the first coil 111. One side of the second electrode 113 is disposed on the outer side of the first housing, and the other side of the second electrode 113 extends into the first housing and is connected to the other side of the first coil 111.

[0049] The second inductor 120 also includes a third electrode 122, a fourth electrode 123, a second housing, and a second powder 124. The second coil 121 is disposed inside the second housing, which is filled with the second powder 124. One side of the third electrode 122 is disposed on the outer side of the second housing, and the other side of the third electrode 122 extends into the second housing and is connected to one side of the second coil 121. One side of the fourth electrode 123 is disposed on the outer side of the second housing, and the other side of the fourth electrode 123 extends into the second housing and is connected to the other side of the second coil 121.

[0050] In other embodiments, please refer to Figure 3 , Figure 4 and Figure 5 A symmetrical center line Y is provided between the axis of the first coil 111 and the axis of the second coil 121, and the first coil 111 and the second coil 121 are symmetrical about the symmetrical center line Y.

[0051] Specifically, the first coil 111 has a first end face and a second end face on both its front and rear sides, and the second coil 121 has a third end face and a fourth end face on both its front and rear sides, with the first end face and the third end face coinciding, and the second end face and the fourth end face coinciding.

[0052] This configuration aligns the first coil 111 and the second coil 121, allowing the magnetic field generated by the first coil 111 and the second coil 121 to be symmetrically superimposed. This avoids insufficient cancellation of local magnetic fields due to misalignment of the first coil 111 and the second coil 121, further reducing the radiation emitted by the inductor unit 100, reducing electromagnetic interference to other components of the electronic device, lowering the probability of radiated emissions exceeding standard limits, and making it easier to meet stringent radiated emission standards.

[0053] Specifically, along the first direction, the projections of the first coil 111 and the second coil 121 coincide, and the first direction is perpendicular to the extension direction of the center line Y of symmetry.

[0054] In other embodiments, please refer to Figure 1 and Figure 2The number of turns in the first coil 111 is the same as the number of turns in the second coil 121. It is understandable that the number of turns is a core parameter determining the inductance value; the inductance value is positively correlated with the square of the number of turns. Having the same number of turns in the first coil 111 and the second coil 121 ensures that the inductance values ​​of the first inductor 110 and the second inductor 120 are the same. This also reduces the occurrence of different magnetic field distributions due to different numbers of turns, improving the cancellation effect after spatial coupling of the magnetic field.

[0055] Meanwhile, consistent inductance values ​​are a prerequisite for uniform current distribution when the first coil 111 and the second coil 121 are connected in parallel. Only when the current is evenly distributed can the first coil 111 and the second coil 121, which are wound in opposite directions, generate opposing magnetic fields of equal strength, thereby maximizing magnetic field cancellation and further reducing radiation leakage of the inductor unit 100.

[0056] Secondly, having the same number of turns ensures that when the first coil 111 and the second coil 121 are connected in parallel, one coil will not bear too much current due to its low resistance. This avoids coil heating and parameter drift caused by local current overload, reduces the occurrence of inductance value decay due to temperature rise, and improves the current carrying capacity and long-term operational reliability of the inductor unit 100.

[0057] In other embodiments, the first coil 111 has a first projection along the axis of the first coil 111 and a second projection along the axis of the second coil 121, the areas of the first projection and the second projection being equal.

[0058] This configuration allows the magnetic fields of the first coil 111 and the second coil 121 to be more symmetrical in spatial distribution, making the effective magnetic fields of the first coil 111 and the second coil 121 closer in coverage and magnetic field strength distribution, preventing the occurrence of magnetic field cancellation blind zones, and further reducing the radiation leakage of the inductor unit 100.

[0059] Meanwhile, the area of ​​the first projection and the area of ​​the second projection are directly related to the geometric parameters such as the winding radius and wire diameter of the coil. The fact that the areas of the first projection and the second projection are equal can reduce the inductance deviation between the first coil 111 and the second coil 121, ensure that the current distribution is more uniform when connected in parallel, ensure that the magnetic field can be effectively coupled and canceled, and improve the heat dissipation conditions of the inductor, thereby improving the system reliability.

[0060] Furthermore, the equal projected area makes the space occupied by the first coil 111 and the second coil 121 more consistent, making it easier to achieve a symmetrical layout along the center line Y during installation. This reduces the center of gravity shift caused by size differences, avoids coil position shift under vibration or thermal expansion and contraction conditions, and prevents the magnetic field cancellation effect from decreasing or the inductance value from drifting. At the same time, a unified coil forming fixture can be used during mass production, improving product consistency and reducing debugging costs. Ultimately, while strengthening the radiation suppression effect, it also takes into account circuit stability and production convenience.

[0061] In other embodiments, both the first coil 111 and the second coil 121 are constructed as helical structures, with the first winding direction A being clockwise and the second winding direction B being counterclockwise.

[0062] This design enables tight winding of multiple turns within a limited space. It is understandable that switching power supply circuits 200 are often limited by installation space. The spiral structure can accommodate a sufficient number of turns through a compact radial arrangement to meet the basic requirements of circuit filtering and energy storage. At the same time, it can avoid the crowded circuit layout caused by the excessive space occupation of traditional loose coils.

[0063] When current flows through two coils connected in parallel, the clockwise spiral coil generates a directional magnetic field along the axis, while the counterclockwise spiral coil generates a magnetic field in the exact opposite direction. Due to the magnetic field concentration of the spiral structure, the two can form efficient coupling in space. The opposing and equally strong magnetic fields can superimpose and cancel each other in the overlapping area, which greatly reduces the magnetic field interference radiated outward by the inductor unit 100. This reduces the risk of the switching power supply exceeding the EMC standard limit due to inductor radiation and avoids magnetic field leakage that could interfere with surrounding sensitive components.

[0064] This design achieves radiation suppression without the need for an additional metal shield, which simplifies circuit design, reduces material and installation costs, does not increase the height, and is conducive to the miniaturization and thinning of the device. It does not require changes to the power supply topology, nor does it require the introduction of active devices or complex controls. It also avoids heat dissipation obstruction caused by the shield, further improving the long-term operational reliability of the inductor unit 100.

[0065] Secondly, embodiments of this application provide a switching power supply circuit 200, including: the inductor unit 100 described in any embodiment.

[0066] The switching power supply circuit 200 according to the second aspect of the present application, having the inductor unit 100 as described in any embodiment, weakens the radiation emitted by the inductor unit 100 from the source, reduces electromagnetic interference to other components of electronic equipment, and reduces the probability of radiated emissions exceeding standard limits. At the same time, it does not require changing the power supply topology, nor does it require introducing active devices or complex control, making it easy to design and implement, with good compatibility, and easy to apply quickly on existing product platforms.

[0067] Specifically, the switching power supply circuit 200 may include a buck circuit, a boost circuit, or a buck-boost circuit, and this application does not limit this.

[0068] In other embodiments, please refer to Figure 3 The switching power supply circuit 200 also includes a first diode 211, a first MOSFET 221, and a first capacitor 231. One side of the first diode 211 is connected to one side of the inductor unit 100, and the other side of the first diode 211 is connected to one side of the first capacitor 231. The source of the first MOSFET 221 is connected to a voltage source, and the drain of the first MOSFET 221 is connected to one side of the inductor unit 100. The other side of the first capacitor 231 is connected to the other side of the inductor unit 100.

[0069] Understandably, the source of the first MOSFET 221 is connected to the voltage source and the drain is connected to the inductor unit 100. Through its periodic switching between conduction and turn-off, it precisely controls the energy input from the voltage source to the inductor unit 100. When it is on, the voltage source current flows through the first MOSFET 221 and is injected into the inductor unit 100 to store energy for the inductor unit 100. When it is off, the inductor unit 100 stops storing energy and begins to release energy. Combined with the reverse winding radiation suppression advantage of the inductor unit 100, it can avoid excessive electromagnetic interference while achieving efficient energy conversion.

[0070] Secondly, the first diode 211 serves a dual function of freewheeling and protection: on the one hand, when the first MOSFET 221 is turned off, the inductor unit 100 will generate a reverse electromotive force due to a sudden change in current. The reverse cutoff of the first diode 211 can prevent the reverse voltage from breaking down the first MOSFET 221 or damaging other components, thus ensuring circuit safety; on the other hand, when the first diode 211 is turned on, it can provide a path for the energy released by the inductor unit 100, guide the energy to the first capacitor 231, avoid energy loss, and improve the overall energy conversion efficiency.

[0071] Finally, the first capacitor 231, the inductor unit 100, and the diode form a filter circuit. One side of the first capacitor 231 is connected to the diode, and the other side of the first capacitor 231 is connected to the inductor unit 100. This can effectively smooth the pulsating energy released by the inductor unit 100, filter out the ripple in the output voltage (such as voltage fluctuations caused by switching), and make the final output voltage stable and smooth.

[0072] With this configuration, the entire circuit can both reduce the input voltage to a lower output voltage and weaken the radiation emitted by the inductor unit 100 at the source, thereby reducing electromagnetic interference to other components of the electronic equipment and lowering the probability of radiation emissions exceeding standard limits.

[0073] In other embodiments, please refer to Figure 4The switching power supply circuit 200 also includes a second diode 212, a second MOSFET 222, and a second capacitor 232. One side of the inductor unit 100 is connected to the voltage source, and the other side of the inductor unit 100 is connected to the source of the second MOSFET 222. The drain of the second MOSFET 222 is connected to one side of the second capacitor 232. One side of the second diode 212 is connected to the other side of the inductor unit 100, and the other side of the second diode 212 is connected to the other side of the second capacitor 232.

[0074] Understandably, when the second MOSFET 222 is turned on, the voltage source current flows through the inductor unit 100 (the inductor absorbs and stores energy from the voltage source, and the current rises linearly). At this time, the second MOSFET 222 provides a low-impedance path for the inductor unit 100, ensuring energy storage efficiency. When the second MOSFET 222 is turned off, the inductor unit 100 generates a reverse electromotive force higher than the input voltage, laying the foundation for subsequent boost output. This on / off control is the core prerequisite for the BOOST circuit to achieve boost. Combined with the energy storage characteristics of the inductor unit 100, it can stably realize the conversion from low-voltage input to high-voltage output (such as boosting the 3.7V battery voltage to 5V for chip use).

[0075] Secondly, when the second MOSFET 222 is turned on, the second diode 212 is reverse-biased because its anode potential is lower than its cathode potential, preventing the high-voltage energy stored in the second capacitor 232 from flowing back to the inductor unit 100 or the voltage source, thus preventing energy loss and discharge of the second capacitor 232. When the second MOSFET 222 is turned off, the high potential reverse electromotive force generated by the inductor unit 100 makes the anode potential of the diode higher than its cathode potential, and the second diode 212 is forward-biased, providing a unidirectional path for the energy released by the inductor unit 100. This efficiently transfers the energy stored in the inductor unit 100 to the second capacitor 232, thereby increasing the output voltage. At the same time, it prevents the reverse electromotive force from breaking down the second MOSFET 222, ensuring circuit safety.

[0076] Finally, the second capacitor 232 can act as a filter and voltage regulator, smoothing the output voltage ripple (filtering out voltage fluctuations caused by the switching frequency), so that the final output high voltage DC voltage is stable and smooth.

[0077] Meanwhile, the second capacitor 232 can temporarily store energy, preventing a sudden drop in output voltage due to input voltage fluctuations or load changes, further improving power supply stability. Overall, this BOOST topology, through the precise coordination of its components, can efficiently achieve the boost function, while ensuring energy conversion efficiency and output quality through diode backflow prevention and capacitor filtering. Combined with the radiation suppression effect of the reverse-wound inductor unit 100, it can meet the high-voltage power supply requirements while avoiding excessive electromagnetic radiation.

[0078] In other embodiments, please refer to Figure 5The switching power supply circuit 200 also includes a third diode 213, a third MOSFET 223, and a third capacitor 233. The source of the third MOSFET 223 is connected to a voltage source, the drain of the third MOSFET 223 is connected to one side of the inductor unit 100, the other side of the inductor unit 100 is connected to one side of the third capacitor 233, the other side of the third capacitor 233 is connected to one side of the third diode 213, and the other side of the third diode 213 is connected to one side of the inductor unit 100.

[0079] Understandably, this topology is a typical BUCK-BOOST circuit. When the third MOSFET 223 is turned on, the voltage source current is injected into the inductor unit 100 through the third MOSFET 223. The inductor unit 100 quickly absorbs and stores energy, and the current rises linearly. At this time, the third MOSFET 223 provides a low-impedance path for the inductor unit 100 to ensure energy storage efficiency. When turned off, the inductor unit 100 generates a reverse electromotive force, and this electromotive force can be flexibly adjusted according to the input voltage and output requirements.

[0080] When the input voltage is lower than the output voltage, the electromotive force is superimposed on the input voltage to achieve voltage boost; when the input voltage is higher than the output voltage, the electromotive force adjusts the energy release amplitude to achieve voltage reduction. At the same time, the radiation suppression advantage of the reverse winding of the inductor unit 100 is superimposed, which can avoid excessive electromagnetic interference during buck-boost conversion.

[0081] Secondly, when the third MOSFET 223 is turned on, the potential on the inductor unit 100 side is lower than that on the third capacitor 233 side. The third diode 213 is reverse cut off because the anode potential is lower than the cathode potential, effectively preventing the energy stored in the third capacitor 233 from flowing back to the inductor unit 100 or the voltage source, thus avoiding energy loss and output voltage drop caused by capacitor discharge. When the third MOSFET 223 is turned off, the reverse electromotive force generated by the inductor unit 100 makes the anode potential of the diode higher than that of the cathode, and the third diode 213 is forward-biased, providing a unidirectional path for the energy released by the inductor unit 100. This not only efficiently transfers the energy stored in the inductor unit 100 to the third capacitor 233, ensuring the stability of the output voltage after buck-boost conversion, but also prevents the reverse electromotive force from breaking down the third MOSFET 223, avoiding component damage and further ensuring circuit safety.

[0082] Finally, the third capacitor 233 can effectively smooth the output voltage ripple and filter out voltage fluctuations caused by the switching frequency, making the final output DC voltage stable and smooth. On the other hand, the third capacitor 233 can temporarily store a certain amount of energy. When the input voltage fluctuates (such as a sudden drop in battery voltage) or the load demand changes suddenly (such as a sudden increase in load current), it can quickly release energy to supplement the power supply, avoid a sudden drop in output voltage, and further improve the anti-interference capability of the circuit power supply.

[0083] Thirdly, embodiments of this application provide an electronic device including the inductor unit 100 described in any embodiment or the switching power supply circuit 200 described in any embodiment.

[0084] The electronic device proposed according to the third aspect of this application, having the inductor unit 100 or the switching power supply circuit 200 described in any embodiment, can weaken the radiation emitted by the inductor unit 100 from the source, reduce electromagnetic interference to other components of the electronic device, and reduce the probability of radiated emissions exceeding the standard limit. At the same time, it does not require changing the power supply topology, nor does it require the introduction of active devices or complex control, making it easy to design and implement and with good compatibility.

[0085] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0086] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0087] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0088] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An inductor unit for a switching power supply circuit, characterized in that, include: The first inductor (110) includes the first coil (111); A second inductor (120) is connected in parallel with the first inductor (110), and the second inductor (120) includes a second coil (121); The first coil (111) has a first winding direction (A), the second coil (121) has a second winding direction (B), and the first winding direction (A) and the second winding direction (B) are opposite; the first inductor (110) has a first inductance value, the second inductor (120) has a second inductance value, and the first inductance value and the second inductance value are the same.

2. The inductor unit (100) according to claim 1, characterized in that, A symmetrical center line (Y) is provided between the axis of the first coil (111) and the axis of the second coil (121), and the first coil (111) and the second coil (121) are symmetrical about the symmetrical center line (Y).

3. The inductor unit (100) according to claim 2, characterized in that, The number of turns of the first coil (111) is the same as the number of turns of the second coil (121).

4. The inductor unit (100) according to claim 3, characterized in that, Along the axis of the first coil (111), the first coil (111) has a first projection, and along the axis of the second coil (121), the second coil (121) has a second projection, the areas of the first projection and the second projection being equal.

5. The inductor unit (100) according to claim 1, characterized in that, Both the first coil (111) and the second coil (121) are constructed as helical structures, with the first winding direction (A) being clockwise and the second winding direction (B) being counterclockwise.

6. A switching power supply circuit, characterized in that, include: The inductor unit (100) as described in any one of claims 1 to 5.

7. The switching power supply circuit according to claim 6, characterized in that, The switching power supply circuit (200) further includes a first diode (211), a first MOSFET (221), and a first capacitor (231). One side of the first diode (211) is connected to one side of the inductor unit (100), and the other side of the first diode (211) is connected to one side of the first capacitor (231). The source of the first MOSFET (221) is connected to a voltage source, and the drain of the first MOSFET (221) is connected to one side of the inductor unit (100). The other side of the first capacitor (231) is connected to the other side of the inductor unit (100).

8. The switching power supply circuit according to claim 6, characterized in that, The switching power supply circuit (200) further includes a second diode (212), a second MOSFET (222), and a second capacitor (232). One side of the inductor unit (100) is connected to a voltage source, and the other side of the inductor unit (100) is connected to the source of the second MOSFET (222). The drain of the second MOSFET (222) is connected to one side of the second capacitor (232). One side of the second diode (212) is connected to the other side of the inductor unit (100), and the other side of the second diode (212) is connected to the other side of the second capacitor (232).

9. The switching power supply circuit according to claim 6, characterized in that, The switching power supply circuit (200) further includes a third diode (213), a third MOSFET (223), and a third capacitor (233). The source of the third MOSFET (223) is connected to a voltage source, the drain of the third MOSFET (223) is connected to one side of the inductor unit (100), the other side of the inductor unit (100) is connected to one side of the third capacitor (233), the other side of the third capacitor (233) is connected to one side of the third diode (213), and the other side of the third diode (213) is connected to one side of the inductor unit (100).

10. An electronic device, characterized in that, Includes the inductor unit (100) as described in any one of claims 1 to 5 or the switching power supply circuit (200) as described in any one of claims 6 to 9.

Images