Electromagnetic system, interference optimization method thereof and electronic equipment

Abstract

The invention provides an electromagnetic system and an electromagnetic interference optimization method thereof, and electronic equipment, the electromagnetic system comprises a magnetic sensitive device and at least one interference source device, the interference source device is configured to generate a symmetrical magnetic field under a power-on condition, and the magnetic sensitive device is at least partially located in the magnetic field. The direction of the magnetic induction lines of the magnetic field generated by the interference source device is set to be perpendicular to the at least one symmetry plane of the magnetic sensitive device, so that the magnetic flux of the magnetic sensitive device is reduced to the minimum, the problem of electromagnetic interference is reduced to the maximum extent, additional materials and structures do not need to be added in an electromagnetic system, an original stacking structure does not need to be greatly changed, and the cost is reduced. And the stacking design is higher in degree of freedom and lower in cost.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electronic devices, and particularly relates to an electromagnetic system, an interference optimization method thereof, and an electronic device. Background Art

[0002] The problem of electromagnetic interference has always been a difficult problem for high-stack electronic devices. For example, taking TWS (True Wireless Stereo) headphones as an example, affected by electromagnetic interference, the headphone speakers are prone to generate current noise, which seriously affects the subjective listening experience.

[0003] In related technologies, generally, the electromagnetic interference problem is alleviated by increasing the distance between the interference source and the magnetic sensor device, adding a magnetic shielding structure, adding a filtering circuit, etc. However, these methods are relatively limited in the extreme stacking scenario and increase the device cost. Summary of the Invention

[0004] To reduce the influence of electromagnetic interference, embodiments of the present disclosure provide an electromagnetic system, an interference optimization method thereof, and an electronic device.

[0005] In a first aspect, embodiments of the present disclosure provide an electromagnetic system,

[0006] including a magnetic sensor device and at least one interference source device, the interference source device being configured to generate a symmetric magnetic field when powered on, and at least a part of the magnetic sensor device being located in the magnetic field;

[0007] wherein, the direction of the magnetic induction line of the magnetic field generated by the interference source device is perpendicular to at least one symmetric plane of the magnetic sensor device, so that the magnetic flux of the magnetic sensor device in the magnetic field is zero or close to zero.

[0008] In some embodiments, the interference source device includes an inductor, the inductor is disposed on the symmetric plane of the magnetic sensor device, and the axis direction of the inductor coil winding is perpendicular to the symmetric plane.

[0009] In some embodiments, it further includes a circuit board, the interference source device is fixedly disposed on the circuit board, and the magnetic sensor device is spaced apart and disposed on one side of the circuit board.

[0010] In some embodiments, the projection of the magnetic sensor device on the circuit board is a centrally symmetric figure, and the interference source device is disposed on the circuit board at the central position of the projection.

[0011] In a second aspect, embodiments of the present disclosure provide an electronic device, including the electromagnetic system according to any embodiment of the first aspect.

[0012] In some embodiments, the electronic device includes TWS earphones, the magnetic sensor device includes a speaker assembly, and the interference source device includes a power inductor.

[0013] In a third aspect, an interference optimization method for an electromagnetic system provided by an embodiment of the present disclosure includes:

[0014] Based on the structure of the magnetic sensor device of the electromagnetic system, determine at least one symmetry plane included in the magnetic sensor device;

[0015] Based on the structure of the interference source device of the electromagnetic system, determine the magnetic field direction generated by the interference source device when powered on;

[0016] Place the interference source device at a target position on the symmetry plane and adjust the angle of the interference source device at the target position until the magnetic induction line direction of the magnetic field is perpendicular to the symmetry plane.

[0017] In some embodiments, the placing the interference source device at a target position on the symmetry plane includes:

[0018] In response to the projection of the magnetic sensor device on a preset plane being a centrosymmetric figure, determine the position on the symmetry plane that coincides with the projection center as the target position.

[0019] In some embodiments, the magnetic sensor device includes a speaker assembly, and the interference source device includes a power inductor.

[0020] In a fourth aspect, an embodiment of the present disclosure provides an electronic device including an electromagnetic system obtained according to the method of any embodiment of the third aspect.

[0021] The electromagnetic system of the embodiment of the present disclosure includes a magnetic sensor device and at least one interference source device. The interference source device is configured to generate a symmetric magnetic field when powered on, and at least a part of the magnetic sensor device is located in the magnetic field. In the embodiment of the present disclosure, by setting the magnetic induction line direction of the magnetic field generated by the interference source device to be perpendicular to at least one symmetry plane of the magnetic sensor device, the magnetic flux of the magnetic sensor device is reduced to the lowest, the electromagnetic interference problem is reduced to the greatest extent, and there is no need to add additional materials and structures to the electromagnetic system, nor to greatly modify the original stacking structure, so the stacking design freedom is higher and the cost is lower. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of an electronic device according to some embodiments of the present disclosure.

[0024] Figure 2 It is a schematic diagram of the principle of an electromagnetic system according to some embodiments of the present disclosure.

[0025] Figure 3 It is a schematic diagram of the principle of an electromagnetic system in the related art.

[0026] Figure 4 It is a schematic diagram of the principle of an electromagnetic system according to some embodiments of the present disclosure.

[0027] Figure 5 It is a schematic diagram of the principle of an electromagnetic system according to some embodiments of the present disclosure.

[0028] Figure 6 It is a schematic diagram of the principle of an electromagnetic system according to some embodiments of the present disclosure.

[0029] Figure 7 It is an effect diagram of an electromagnetic system according to some embodiments of the present disclosure.

[0030] Figure 8 It is an effect diagram of an electromagnetic system according to some embodiments of the present disclosure.

[0031] Figure 9 It is an effect diagram of an electromagnetic system according to some embodiments of the present disclosure.

[0032] Figure 10 It is an effect diagram of an electromagnetic system according to some embodiments of the present disclosure.

[0033] Figure 11 It is a flowchart of an electromagnetic interference optimization method for an electromagnetic system according to some embodiments of the present disclosure.

[0034] Figure 12 It is a block diagram of the structure of an electronic device according to some embodiments of the present disclosure. Specific Embodiments

[0035] The technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure. In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0036] Electromagnetic interference (EMI) is electronic noise that interferes with electrical signals and degrades signal integrity. A common electromagnetic interference system consists of a source of interference, a path of interference, and a victim.

[0037] For example, taking the common electromagnetic interference in TWS (True Wireless Stereo) earphones as an example, the source of interference can be a power inductor, the path of interference is spatial radiation, and the victim is the magnetic sensitive device in the earphone (such as a speaker assembly, etc.).

[0038] The power inductor mainly consists of a magnetic core, a coil, a connector, etc. Its working principle is based on the principles of electromagnetic induction and energy storage. The power inductor generates a magnetic field by winding a coil around the magnetic core and stores electrical energy as magnetic energy. When the input current changes, the magnetic field in the coil also changes and releases magnetic energy. The power inductor can convert the input electrical energy into stable output electrical energy to ensure the stable operation of the circuit.

[0039] There are many components to be integrated in TWS earphones, so the internal space stacking degree of the earphones is very high. Refer to Figure 1 As shown, when working with high-power Bluetooth, such as when playing audio, the magnetic field generated by the power inductor will cause electromagnetic interference to the speaker assembly, thereby generating an induced current in the speaker assembly, resulting in a "hissing" current sound from the speaker, seriously affecting the subjective listening experience.

[0040] In related technologies, in order to eliminate or reduce electromagnetic interference problems, generally, it also starts from three aspects: the source of interference, the path of interference, and the magnetic sensitive device. For example, the spatial distance between the source of interference and the magnetic sensitive device can be increased, but in scenarios with extreme stacking such as TWS earphones, this method cannot be used; for another example, an additional electromagnetic shielding structure can be added, but this increases the material cost and assembly difficulty; for another example, a filter circuit can be added to filter electromagnetic interference signals, but this also increases the cost additionally, and if the frequency of the interference signal exactly falls within the required frequency range, the filter circuit cannot filter the electromagnetic interference signal.

[0041] As can be seen from the above, in the related art, the solutions for optimizing electromagnetic interference all inevitably have problems such as increased cost, limited space, and poor effect.

[0042] Based on this, the embodiments of the present disclosure provide an electromagnetic system, an interference optimization method thereof, and an electronic device, aiming to provide a theoretical basis for the assembly between the interference source and the magnetic sensor device in principle without adding other components and without major changes to the stacking, minimizing the electromagnetic interference problem, and being adaptable to any product.

[0043] The electromagnetic system of the embodiments of the present disclosure includes a magnetic sensor device and at least one interference source device. In the electromagnetic interference system, the interference source device is the source that generates electromagnetic interference, and the magnetic sensor device is the one being interfered.

[0044] It should be noted that in the embodiments of the present disclosure, the specific device types of the interference source device and the magnetic sensor device are not limited. In different electronic devices and electrical systems, the interference source device and the magnetic sensor device can be any device types suitable for forming an electromagnetic interference system.

[0045] For example, in one example, referring to Figure 1 the TWS earphone shown, the interference source device can be one or more power inductors in the earphone, and the magnetic sensor device can be the speaker assembly of the earphone. For example, in another example, taking a circuit board as an example, the interference source device can be one or more traces or inductors on the circuit board, and the magnetic sensor device can be an integrated circuit, a transistor, etc. on the circuit board. Of course, those skilled in the art can understand that the interference source device and the magnetic sensor device can also be other device types, and the present disclosure does not limit this.

[0046] For the convenience of the following description and understanding, in the following embodiments of the present disclosure, taking Figure 1 the TWS earphone shown as an example, the interference source device is the power inductor, and the magnetic sensor device is the speaker assembly, and the principle of the embodiments of the present disclosure will be described by taking this as an example.

[0047] Referring to Figure 2 as shown in (a) of, according to Maxwell's electromagnetic theory, when an electric current passes through a wire, a magnetic field will be generated around the wire. The direction of the magnetic field conforms to the right-hand screw rule, that is, when the right hand holds the wire and the thumb points to the direction of the current, the direction of the four fingers' circumvolution is the direction of the magnetic induction line of the magnetic field, and the magnetic field intensity is stronger closer to the wire and weaker farther away from the wire.

[0048] Due to its winding structure and the strengthening effect of the internal magnetic core on the magnetic field, for an inductor, when passing the same current, the magnetic field generated by the inductor will be hundreds of times stronger than that of the wire. Referring to Figure 2As shown in (b), the direction of the magnetic field generated by the inductor also conforms to the right-hand screw rule, that is, hold the solenoid with the right hand, the direction of the four fingers is the direction of the current, and the direction of the thumb is the direction of the magnetic field coming out. The magnetic induction lines of the magnetic field generated by the inductor are symmetrically closed coils, so in the magnetic field generated by the inductor, the number of magnetic induction lines coming out and going in is the same.

[0049] See Figure 3 As shown, in the TWS earphone, the magnetic field generated by the power inductor is as shown in the figure. For the speaker component located in the magnetic field, when the magnetic induction line passes through the speaker component, magnetic flux will be generated in the speaker component ( Figure 3 the overall magnetic flux in is downward). According to Faraday's electromagnetic law, the change of magnetic flux will generate an induced electromotive force, which acts on the speaker voice coil to generate an induced current, causing the voice coil to vibrate and generating current noise.

[0050] Through the exploration of this principle, it can be known that the essence of electromagnetic interference generated in the magnetic sensor device is that due to the magnetic field generated by the interference source device, when the magnetic induction line passes through the magnetic sensor device, there is magnetic flux, thus generating an induced current and causing electromagnetic interference problems.

[0051] Therefore, in the embodiments of the present disclosure, it is aimed to determine the relative position relationship between the magnetic sensor device and the interference source device, so that the magnetic flux of the magnetic sensor device in the magnetic field value of the interference source device is zero or as close to zero as possible, so that no induced current or only a very small induced current is generated in the magnetic sensor device, thereby eliminating or reducing the electromagnetic interference problem.

[0052] According to the definition of magnetic flux, it can be understood that if the magnetic induction lines entering and leaving a certain surface are the same, that is, the upward magnetic flux of this surface is the same as the downward magnetic flux, then the magnetic induction lines cancel each other out and the overall magnetic flux is zero. Based on this, the embodiments of the present disclosure propose that for a symmetric magnetic sensor device, when the direction of the magnetic induction line generated by the interference source device is perpendicular to the symmetry plane of the magnetic sensor device, the magnetic flux of the magnetic sensor device in this magnetic field is zero or close to zero.

[0053] For comparison Figure 3 In the embodiments of the present disclosure, see Figure 4 As shown, the dotted line a in the figure actually represents a symmetry plane of the speaker component, that is, the symmetry plane parallel to the YoZ plane where the dotted line a is located. Define this symmetry plane as symmetry plane a, and the speaker component is at least symmetric about the symmetry plane a.

[0054] In this case, the power inductor is arranged on the symmetry plane a, and at the same time as Figure 4As shown, the magnetic induction line direction of the magnetic field generated by the power inductor is perpendicular to the symmetric plane a when passing through the symmetric plane a, that is, the magnetic field direction is perpendicular to the symmetric plane a. At this time, it can be seen that in this magnetic field, the magnetic induction lines penetrating into and out of the speaker assembly are completely symmetric, and thus cancel each other out. The magnetic flux of the speaker assembly in the magnetic field is zero (or very close to zero). At this time, no induced current or only a very small induced current is generated in the speaker assembly, eliminating or reducing the electromagnetic interference problem.

[0055] It should be noted that, in Figure 4 the embodiment, merely setting the power inductor on the symmetric plane a of the speaker assembly cannot ensure that the magnetic flux of the speaker assembly is zero or minimum. This is because the magnetic field direction generated by the power inductor changes with the angle of the power inductor. If the angle of the power inductor changes in the Figure 4 example, then the magnetic field direction is no longer the direction shown in the figure, and the magnetic field direction will no longer be perpendicular to the symmetric plane a, and the above-mentioned effect cannot be achieved.

[0056] Therefore, the core principle of the embodiment of the present disclosure is: making the magnetic field direction of the interference source device perpendicular to the symmetric plane of the magnetic sensitive device. At this time, the magnetic flux of the magnetic sensitive device in the magnetic field is the smallest. Based on this principle, it can be known that in the Figure 4 example, the power inductor can be placed at any position on the symmetric plane a. As long as the angle of the power inductor is adjusted to keep the magnetic field direction perpendicular to the symmetric plane a, then no matter where the power inductor is set on the symmetric plane a, theoretically, the magnetic flux can be minimized or zero.

[0057] In other words, in the embodiment of the present disclosure, when setting the relative position relationship between the magnetic sensitive device and the interference source device, first, it is necessary to set the interference source device on the symmetric plane of the magnetic sensitive device. Secondly, it is also necessary to adjust the angle of the interference source device to change the magnetic field direction of the interference source device so that the magnetic induction line direction of the magnetic field of the interference source device is perpendicular to the symmetric plane.

[0058] In some embodiments, as shown in Figure 4 , the electromagnetic system of the example of the present disclosure further includes a circuit board. The circuit board can be, for example, a PCB (Printed Circuit Boards). The interference source device is fixedly arranged on the circuit board, and the magnetic sensitive device is spaced above the circuit board.

[0059] For the sake of generality, the principle of the electromagnetic system of the embodiment of the present disclosure will be described below by combining Figure 5 and Figure 6 two different shapes of magnetic sensitive devices respectively.

[0060] In Figure 5 and Figure 6In the embodiments, the magnetic sensor device still takes the speaker component as an example, and the interference source device still takes the power inductor as an example. In Figure 5 the example, the projection of the speaker component on the circuit board is oblong (racetrack-shaped), while Figure 6 in the example, the projection of the speaker component on the circuit board is circular.

[0061] Referring to Figure 5 as shown, Figure 5 the gray oblong structure in is the top view of the magnetic sensor device. It can be understood that the oblong has two symmetry axes, namely symmetry axis a and symmetry axis b. Therefore, the magnetic sensor device has the following two symmetry planes, namely: 1) the symmetry plane parallel to the yoz plane where the symmetry axis b is located, defined as symmetry plane b; 2) the symmetry plane parallel to the xoz plane where the symmetry axis c is located, defined as symmetry plane c. It can be seen from this that the interference source device can be arranged on the symmetry plane b or on the symmetry plane c.

[0062] Taking the symmetry plane b as an example, referring to Figure 5 as shown, the interference source device is an inductor. After the inductor is arranged at a certain position on the symmetry plane b, based on the magnetic field direction of the inductor described above, in order to ensure that the magnetic induction line direction of the magnetic field generated by the inductor is perpendicular to the symmetry plane b, it is necessary to set the axis direction of the coil winding of the inductor perpendicular to the symmetry plane b. For example, when the inductor is arranged at Figure 5 the position 1 shown, the axis direction of the inductor needs to be perpendicular to the symmetry plane b.

[0063] Taking the symmetry plane c as an example, referring to Figure 5 as shown, the interference source device is an inductor. After the inductor is arranged at a certain position on the symmetry plane c, based on the magnetic field direction of the inductor described above, in order to ensure that the magnetic induction line direction of the magnetic field generated by the inductor is perpendicular to the symmetry plane c, it is necessary to set the axis direction of the coil winding of the inductor perpendicular to the symmetry plane c. For example, when the inductor is arranged at Figure 5 the position 2 shown, the axis direction of the inductor needs to be perpendicular to the symmetry plane c.

[0064] Of course, those skilled in the art can understand that when setting the position of the interference source device on the symmetry plane b, it is not limited to the position 1 shown in the figure. Similarly, when setting the position of the interference source device on the symmetry plane c, it is not limited to the position 2 shown in the figure. The figure only gives an exemplary illustration. In fact, when the interference source device is arranged at any position on the symmetry plane b and the symmetry plane c, theoretically, the effect of minimizing the induced magnetic flux of the magnetic sensor device can be achieved. The present disclosure will not elaborate on this.

[0065] In addition, it is worth noting that for the central position where the symmetry plane b and the symmetry plane c intersect, theoretically speaking, when the interference source device is disposed at this central position, no matter which symmetry plane among the symmetry plane b and the symmetry plane c the magnetic field direction of the interference source device is perpendicular to, the above effects can be achieved. Those skilled in the art can understand this, and the present disclosure will not elaborate further.

[0066] Furthermore, the number of interference source devices in the embodiments of the present disclosure is not limited to one, and the number of interference source devices can also be multiple. For example Figure 5 In the example, the number of interference source devices can be two. The two interference source devices can both be disposed on the symmetry plane b, or both on the symmetry plane c, or as Figure 5 shown in, one is located on the symmetry plane b and one is located on the symmetry plane c. It only needs to ensure that the magnetic field direction of each interference source device is perpendicular to the symmetry plane where it is located based on the above principle. Those skilled in the art can understand this, and the present disclosure will not elaborate further.

[0067] Refer to Figure 6 shown in Figure 6 The gray circular structure in is the top view of the magnetic sensor device. It can be understood that a circle has an infinite number of symmetry axes. Therefore, the magnetic sensor device can include multiple symmetry planes, that is, each normal plane where the diameter is located is a symmetry plane.

[0068] In this case, a symmetry plane of the magnetic sensor device can be first selected. Then, after the inductor is disposed at a certain position on this symmetry plane, by adjusting the angle of the inductor, the axis direction of the inductor coil winding is made perpendicular to this symmetry plane, so as to ensure that the magnetic field direction of the inductor is perpendicular to the symmetry plane, and the magnetic flux passing through the magnetic sensor device is minimized.

[0069] For example Figure 6 shown in, when the inductor is disposed at position 3, the axis direction of the inductor coil winding needs to be adjusted to be perpendicular to the symmetry plane d; when the inductor is disposed at position 4, the axis direction of the inductor coil winding needs to be adjusted to be perpendicular to the symmetry plane e; when the inductor is disposed at position 5, the axis direction of the inductor coil winding needs to be adjusted to be perpendicular to the symmetry plane f; when the inductor is disposed at position 6, the axis direction of the inductor coil winding needs to be adjusted to be perpendicular to the symmetry plane g; and so on. Of course, those skilled in the art can understand that the position where the inductor is disposed is not limited to the positions shown in the figure, and it can also be disposed at any other position. It only needs to adjust the axis direction of the inductor coil winding to be perpendicular to the symmetry plane, so as to achieve that the magnetic field direction generated by the inductor is perpendicular to the symmetry plane of the magnetic sensor device, and the induced magnetic flux of the magnetic sensor device is minimized. The present disclosure will not elaborate further on this.

[0070] In addition, it is worth noting that for the central position where each symmetry plane intersects, theoretically, when the inductor is placed at this central position, the above effects can be achieved regardless of how the inductor angle is arranged. Those skilled in the art can understand this, and the present disclosure will not elaborate further. Moreover, the number of interference source devices in the examples of the present disclosure is not limited to one either. For the same principle as described above, the present disclosure will not elaborate further.

[0071] In some embodiments, Figures 7 - 10 shows Figure 4 the simulation cloud map of the electromagnetic system shown below. Further, in combination with Figures 7 - 10 the principle of the electromagnetic system of the embodiments of the present disclosure will be described.

[0072] As Figure 7 shown, the power inductor is disposed at the middle position of the speaker assembly, and the coil winding axis of the power inductor is p, and this axis is perpendicular to the symmetry plane h of the speaker assembly. In the embodiments of the present disclosure, it is defined that Figure 7 the angle of the power inductor shown is 0 degrees. In Figure 7 the example, it can be seen from the simulation cloud map that on the entire symmetry plane h, the current noise interference value (dB) of the speaker assembly is the smallest, generally lower than 10 dB.

[0073] As Figure 8 shown, in Figure 8 the example, the power inductor rotates counterclockwise by 30 degrees compared to the Figure 7 initial position. At this time, the coil winding axis P of the power inductor is perpendicular to the symmetry plane i of the speaker assembly. In Figure 8 the example, it can be seen from the simulation cloud map that on the entire symmetry plane i, the current noise interference value (dB) of the speaker assembly is the smallest, generally lower than 10 dB.

[0074] As Figure 9 shown, in Figure 9 the example, the power inductor rotates counterclockwise by 45 degrees compared to the Figure 7 initial position. At this time, the coil winding axis P of the power inductor is perpendicular to the symmetry plane j of the speaker assembly. In Figure 9 the example, it can be seen from the simulation cloud map that on the entire symmetry plane j, the current noise interference value (dB) of the speaker assembly is the smallest, generally lower than 10 dB.

[0075] As Figure 10 shown, in Figure 10 the example, the power inductor rotates counterclockwise by 90 degrees compared to the Figure 7 initial position. At this time, the coil winding axis P of the power inductor is perpendicular to the symmetry plane k of the speaker assembly. In Figure 10In the example, it can be seen from the simulation cloud map that on the entire symmetry plane k, the current noise interference value (dB) of the speaker component is the smallest, generally lower than 10 dB.

[0076] Through the above Figures 7 - 10 simulation cloud map also proves the correctness of the above conclusion of the present disclosure, that is, when the magnetic induction line direction of the magnetic field of the inductor is perpendicular to a certain symmetry plane of the speaker component, the magnetic flux in the speaker component is the smallest, so the induced electromotive force and induced current are the smallest, and the current noise generated by the electromagnetic interference is also the smallest.

[0077] As can be seen from the above, in the embodiment of the present disclosure, there is no need to add additional materials and structures in the electromagnetic system, nor to greatly modify the original stacking structure. It only needs to adjust the relative position relationship between the interference source device and the magnetic sensitive device based on the above theory of the present disclosure, so that the magnetic induction line direction of the magnetic field generated by the interference source device is perpendicular to the symmetry plane of the magnetic sensitive device, so as to minimize the magnetic flux of the magnetic sensitive device and maximize the reduction of the electromagnetic interference problem.

[0078] In addition, the principle adopted by the solution of the present disclosure can also provide good theoretical guidance for the stacking design of the electromagnetic system. Thus, in an electronic device with a high stacking degree, the relative position between the magnetic sensitive device and the interference source device can be designed quickly and accurately. The following combines Figure 11 the interference optimization method of the electromagnetic system shown to illustrate the design process of the electromagnetic system.

[0079] As Figure 11 shown, the interference optimization method of the electromagnetic system in the example of the present disclosure includes:

[0080] S110. Based on the structure of the magnetic sensitive device of the electromagnetic system, determine at least one symmetry plane included in the magnetic sensitive device.

[0081] In the example of the present disclosure, the electromagnetic system still takes the aforementioned TWS earphone as an example. The magnetic sensitive device included in the electromagnetic system is the speaker component of the TWS earphone, and the interference source device is the power inductor of the TWS earphone.

[0082] Combined with the above theory, it can be understood that when setting the relative position relationship between the magnetic sensitive device and the interference source device, it is first necessary to set the interference source device on the symmetry plane of the magnetic sensitive device. Therefore, in the embodiment of the present disclosure, it is first necessary to determine one or more symmetry planes of the magnetic sensitive device according to the structure of the magnetic sensitive device.

[0083] It can be understood that the symmetric structure of the magnetic sensitive device may have only one symmetry plane or may have multiple symmetry planes. For example, Figure 1Taking the exemplary speaker assembly as an example, the projection of the speaker assembly is circular. Therefore, the speaker assembly can include an infinite number of symmetry planes, and thus one or more symmetry planes can be arbitrarily selected.

[0084] S120. Determine the magnetic field direction generated by the interference source device when it is energized based on the structure of the interference source device of the electromagnetic system.

[0085] Combined with the foregoing theory, it can be understood that when setting the relative position relationship between the magnetic sensor device and the interference source device, secondly, the angle of the interference source device needs to be adjusted so that the magnetic induction line direction of the magnetic field of the interference source device is perpendicular to the symmetry plane. Therefore, it is necessary to determine the magnetic field direction generated by the interference source device in the energized state according to the structure of the interference source device.

[0086] For example, in the example of the present disclosure, if the interference source device is a power inductor, the magnetic field direction generated by the power inductor can be referred to Figure 4 as shown.

[0087] S130. Place the interference source device at the target position on the symmetry plane and adjust the angle of the interference source device at the target position until the magnetic induction line direction of the magnetic field is perpendicular to the symmetry plane.

[0088] Combined with the foregoing theory, it can be understood that when setting the relative position relationship between the magnetic sensor device and the interference source device, first, the interference source device needs to be set on the symmetry plane of the magnetic sensor device. Thus, after determining the symmetry plane of the magnetic sensor device through S110, the interference source device can be placed on this symmetry plane.

[0089] However, it can be understood that the symmetry plane is a plane with an infinite number of positions. Therefore, the position of the interference source device can be selected according to specific space stacking requirements, and a suitable position on the symmetry plane can be selected as the target position.

[0090] For example, in one example, the stacking design of the power inductor and the speaker assembly also needs to consider the structures of other devices in the TWS earphone. Thus, on the basis of meeting the stacking design of other devices, the power inductor can be placed at the target position on the symmetry plane of the speaker assembly.

[0091] Furthermore, when space permits, the interference source device can be placed at the center position of the projection of the magnetic sensor device on the preset plane, that is, determining this center position as the target example. For example Figure 4 as shown, the power inductor can be placed on the circuit board at the center position of the speaker assembly. Thus, no matter how the angle of the power inductor is arranged, the design requirement of the minimum magnetic flux can be met. And combined with Figures 7 - 10 the simulation cloud map, it can be seen that when the power inductor is at this center position, the magnetic flux of the speaker assembly is the smallest and the current noise is the smallest.

[0092] Combined with the foregoing principle, it can be seen that when only the interfering source device is arranged at the target position of the symmetry plane, it is not necessarily possible to ensure that the magnetic induction line direction of the magnetic field generated by the interfering source device is perpendicular to the symmetry plane. Therefore, it is also necessary to further adjust the angle of the interfering source device, and combine the magnetic field placement determined by the foregoing S120 until the magnetic induction line direction of the magnetic field of the interfering source device is adjusted to be perpendicular to the symmetry plane, that is, the design of the electromagnetic system is completed.

[0093] It can be understood that in the traditional stacked design of electronic devices, due to the lack of guiding basis, electromagnetic devices can only be placed aimlessly. Then, if electromagnetic interference is detected by electromagnetic testing, the stacking scheme is redesigned, and then electromagnetic testing is carried out again, and so on, until the test is passed. The whole process requires repeated modification of the stacking scheme, resulting in extremely high time costs and design costs.

[0094] However, in the embodiments of the present disclosure, guided by the foregoing theoretical basis, when designing the stacking of electronic devices, the interfering source devices can be placed purposefully, thereby minimizing the electromagnetic interference problem, greatly reducing the stacking design cost and time cycle, and having strong robustness.

[0095] In some embodiments, the present disclosure provides an electronic device, which includes the electromagnetic system of any of the foregoing embodiments. For example, in one example, taking the TWS earphone shown as an example, the electromagnetic system includes a power inductor as the interfering source device and a speaker assembly as the magnetic sensitive device. For the electromagnetic interference optimization of the electromagnetic system, reference can be made to the foregoing method, and the present disclosure will not elaborate herein. Figure 1 Shown in the figure, taking the TWS earphone as an example, the electromagnetic system includes a power inductor as the interfering source device and a speaker assembly as the magnetic sensitive device. For the electromagnetic interference optimization of the electromagnetic system, reference can be made to the foregoing method, and the present disclosure will not elaborate herein.

[0096] Figure 12 The block diagram of the electronic device in some embodiments of the present disclosure is shown. Referring to Figure 12 , the electronic device 1800 may include one or more of the following components: a processing component 1802, a memory 1804, a power supply component 1806, a multimedia component 1808, an audio component 1810, an input / output (I / O) interface 1812, a sensor component 1816, and a communication component 1818.

[0097] The processing component 1802 generally controls the overall operation of the electronic device 1800, such as operations associated with display, telephone call, data communication, camera operation, and recording operation. The processing component 1802 may include one or more processors 1820 to execute instructions. In addition, the processing component 1802 may include one or more modules to facilitate the interaction between the processing component 1802 and other components. For example, the processing component 1802 may include a multimedia module to facilitate the interaction between the multimedia component 1808 and the processing component 1802. Another example is that the processing component 1802 may read executable instructions from the memory to implement the functions related to the electronic device.

[0098] The memory 1804 is configured to store various types of data to support the operation of the electronic device 1800. Examples of such data include instructions for any application or method operating on the electronic device 1800, contact data, phone book data, messages, pictures, videos, and the like. The memory 1804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0099] The power supply component 1806 provides power to various components of the electronic device 1800. The power supply component 1806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 1800.

[0100] The multimedia component 1808 includes a display screen that provides an output interface between the electronic device 1800 and the user. In some embodiments, the multimedia component 1808 includes a front camera and / or a rear camera. When the electronic device 1800 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0101] The audio component 1810 is configured to output and / or input audio signals. For example, the audio component 1810 includes a microphone (MIC) that is configured to receive external audio signals when the electronic device 1800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 1804 or transmitted via the communication component 1818. In some embodiments, the audio component 1810 further includes a speaker for outputting audio signals.

[0102] The I / O interface 1812 provides an interface between the processing component 1802 and a peripheral interface module, which can be a keyboard, a click wheel, buttons, etc. These buttons can include, but are not limited to: a home button, a volume button, a power button, and a lock button.

[0103] The sensor assembly 1816 includes one or more sensors for providing an assessment of various aspects of the electronic device 1800. For example, the sensor assembly 1816 can detect the on / off state of the electronic device 1800, the relative positioning of components, such as the display and keypad of the electronic device 1800. The sensor assembly 1816 can also detect a change in the position of the electronic device 1800 or a component of the electronic device 1800, the presence or absence of user contact with the electronic device 1800, the orientation or acceleration / deceleration of the electronic device 1800, and a change in the temperature of the electronic device 1800. The sensor assembly 1816 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 1816 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1816 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0104] The communication component 1818 is configured to facilitate communication between the electronic device 1800 and other devices in a wired or wireless manner. The electronic device 1800 can access a wireless network based on communication standards, such as Wi-Fi, 2G, 3G, 4G, 5G, or 6G, or a combination thereof. In an exemplary embodiment, the communication component 1818 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1818 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0105] In an exemplary embodiment, the electronic device 1800 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0106] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the embodiments. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all embodiments here. The obvious changes or modifications derived therefrom are still within the protection scope of this disclosure.

Claims

1. An electromagnetic system, characterized in that, it includes a magnetic sensor device and at least one interference source device, the interference source device is configured to generate a symmetric magnetic field when powered on, and the magnetic sensor device is at least partially located in the magnetic field; wherein, the direction of the magnetic induction lines of the magnetic field generated by the interference source device is perpendicular to at least one symmetry plane of the magnetic sensor device, so that the magnetic flux of the magnetic sensor device in the magnetic field is zero or close to zero.

2. The electromagnetic system according to claim 1, characterized in that, the interference source device includes an inductor, the inductor is arranged on the symmetry plane of the magnetic sensor device, and the axis direction of the inductor coil winding is perpendicular to the symmetry plane.

3. The electromagnetic system according to claim 1 or 2, characterized in that, it further includes a circuit board, the interference source device is fixedly arranged on the circuit board, and the magnetic sensor device is spaced apart on one side of the circuit board.

4. The electromagnetic system according to claim 3, characterized in that, the projection of the magnetic sensor device on the circuit board is a centrosymmetric figure, and the interference source device is arranged on the circuit board at the center position of the projection.

5. An electronic device, characterized in that, including the electromagnetic system according to any one of claims 1 to 4.

6. The electronic device according to claim 5, characterized in that, the electronic device includes TWS earphones, the magnetic sensor device includes a speaker assembly, and the interference source device includes a power inductor.

7. A method for optimizing interference of an electromagnetic system, characterized in that including: Based on the structure of the magnetic sensor device of the electromagnetic system, determine at least one symmetry plane included in the magnetic sensor device; Based on the structure of the interference source device of the electromagnetic system, determine the direction of the magnetic field generated by the interference source device when powered on; Arrange the interference source device at the target position on the symmetry plane, and adjust the angle of the interference source device at the target position until the direction of the magnetic induction lines of the magnetic field is perpendicular to the symmetry plane.

8. The method according to claim 7, wherein, The arranging the interference source device at the target position on the symmetry plane includes: In response to the projection of the magnetic sensor device on the preset plane being a centrosymmetric figure, determine the position coinciding with the projection center on the symmetry plane as the target position.

9. The method according to claim 7, characterized in that, the magnetic sensor device includes a speaker assembly, and the interference source device includes a power inductor.

10. An electronic device, characterized in that, it includes an electromagnetic system obtained by the method according to any one of claims 7 to 9.

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