CN115226010B - Anti-magnetic interference structure and electronic equipment - Google Patents

Abstract

The application discloses an anti-magnetic interference structure and electronic equipment, and relates to the technical field of terminal equipment. Wherein, the structure includes a loudspeaker and an interfering wire, the loudspeaker includes a first metal coil, the interfering wire will generate an interfering magnetic field, and a metal conductor connected in series with the first metal coil. Wherein, the first metal coil and the metal conductor respectively induce a first induction current and a second induction current in the disturbance magnetic field, the direction of the second induction current is opposite to the direction of the first induction current, and the magnitude of the second induction current is the same as that of the first induction current. The magnitude difference of the induced current is smaller than the magnitude of the first induced current. In this structure, a metal conductor is connected in series in the circuit where the first metal coil of the loudspeaker is located, and the second induced current generated by the metal conductor flows in the opposite direction to the first induced current generated by the first metal coil, so that the second induced current and The first induced currents cancel each other, thereby reducing the influence of the first induced currents on the speaker.

Description

An anti-magnetic interference structure and electronic equipment

technical field

The present application relates to the field of terminal equipment, in particular to an anti-magnetic interference structure and electronic equipment.

Background technique

Existing terminal devices are generally equipped with speakers or receivers. During playback or standing still, dynamic speakers or receivers (Receiver, RCV) are susceptible to interference from the changing low-frequency magnetic field around them. A low-frequency alternating current is induced, and when the current reaches a certain level, it will push the speaker or RCV to emit an interference sound, which is often harmful to the audio signal.

If the current changes within the audio frequency range, the human ear can hear the corresponding audio noise interference. When a low-impedance speaker is used as an RCV, since the effective magnetic induction area of the moving coil of the speaker is large, and the loop impedance composed of the coil and the circuit driving the coil is small, the audio noise induced by this magnetic field will be easier to reach the human ear. perceived loudness.

Therefore, the audio noise generated by the interference magnetic field has become an urgent problem to be solved in the terminal equipment.

Contents of the invention

The application provides an anti-magnetic interference structure and electronic equipment. The anti-magnetic interference structure can generate a new current, which can offset the current generated by the interference magnetic field on the coil, thereby greatly reducing the impact of the interference magnetic field on the speaker. / Interference amplitude of the earpiece.

In order to achieve the above object, the embodiments of the present application adopt the following technical solutions:

In the first aspect, an anti-magnetic interference structure is provided, the structure includes a loudspeaker and an interfering wire, the loudspeaker includes a first metal coil, the interfering wire will generate an interfering magnetic field, and also includes a metal conductor, the metal conductor is connected in series with the first metal coil connect. Wherein, the first metal coil induces a first induction current in the disturbance magnetic field, and the metal conductor induces a second induction current in the disturbance magnetic field. The direction of the second induction current is opposite to that of the first induction current, and the difference between the magnitude of the second induction current and the magnitude of the first induction current is smaller than the magnitude of the first induction current.

On this basis, this application connects a metal conductor in series in the circuit where the first metal coil of the loudspeaker is located. Since the metal conductor will also generate an induced current in the interfering magnetic field, it is possible to make the metal conductor produce an induced current by means of reverse connection. The second induced current flows in the opposite direction to the first induced current generated by the first metal coil in the disturbing magnetic field, so that the second induced current and the first induced current cancel each other out, because the magnitude of the second induced current is different from that of the first induced current The difference in magnitude is smaller than the magnitude of the first induced current, so the influence of the first induced current on the speaker can be reduced. The more the second inductive current and the first inductive current cancel each other out, the less impact the interfering wire has on the speaker.

In a possible design manner of the first aspect, the metal conductor is a metal wire, the metal wire is arranged parallel to the interference line, and the distance between the metal wire and the interference line is less than or equal to the first preset distance.

On this basis, setting the metal conductor as a metal wire is one of its specific implementation methods. The metal wire has the advantages of small space occupation and flexible layout. By setting the distance between the metal wire and the interference line less than or equal to the first The preset distance allows the metal wire to be placed close to the interference wire, so that the size of the second induced current generated in the metal wire can be as close as possible to the size of the first induced current, and the parallel arrangement of the metal wire and the interference wire can also be used. The magnitude of the second induced current is as close as possible to the effect of the magnitude of the first induced current.

In a possible design manner of the first aspect, the metal conductor is a second metal coil, and the distance between the second metal coil and the interference wire is smaller than a second preset distance.

On this basis, setting the metal conductor as the second metal coil is another embodiment of the second metal coil. Compared with the metal wire, the second metal coil has a stronger magnetic induction capability and can induce a stronger second induced current. . By setting the distance between the second metal coil and the interference line to be less than or equal to the second preset distance, the second metal coil can be arranged close to the interference line, so that the magnitude of the second induced current generated in the metal wire can be as close as possible to the first A magnitude of the induced current.

In a possible design manner of the first aspect, the center line of the second metal coil is parallel to the interference line. This design method is a specific arrangement method of the second metal coil, and the placement form of the second metal coil can be set as required.

In a possible design manner of the first aspect, the second metal coil is disposed on a circuit board.

On this basis, by arranging the second metal coil on a circuit board, the second metal coil can avoid occupying the space on the circuit board in the electronic device, and the position of the second metal coil can be flexibly adjusted.

In the second aspect, an anti-magnetic interference structure is provided, including a loudspeaker and an interfering wire, the loudspeaker includes a first metal coil, the first metal coil is symmetrical about its center line, the interfering wire will generate an interfering magnetic field, and a circuit board, The interference line is arranged on the circuit board, and the plane where the interference line and the centerline of the first metal coil are located equally divides the first metal coil.

On this basis, by laying out the interfering lines that interfere with the speaker on a circuit board, and then flexibly adjusting the position of the circuit board, the plane where the interfering lines and the center line of the first metal coil are located equally divides the first metal coil , so that the interference magnetic field generated by the interference line is evenly distributed on both sides of the plane where the interference line and the center line are located, and the directions of the magnetic fields on both sides are opposite, so that the induced current generated by the interference magnetic field on the first metal coil is 0 or close to 0. On the basis of not adding complicated circuit structures or electronic components, only adjusting the layout of the interference wires near the loudspeaker produces good anti-interference effect, and the cost is low.

In a third aspect, an electronic device is provided, including the anti-magnetic interference structure provided in the first aspect, the second aspect, and any possible design manner thereof.

It can be understood that the beneficial effects that can be achieved by the electronic device provided by the third aspect provided above can refer to the beneficial effects in the first aspect, the second aspect and any possible design methods thereof, which are not repeated here. repeat.

Description of drawings

FIG. 1 is a schematic diagram of a speaker in an electronic device in the prior art being subjected to electromagnetic interference;

Fig. 2 is a schematic diagram of anti-electromagnetic interference of a loudspeaker in an electronic device in the prior art;

FIG. 3 is a schematic diagram of an anti-magnetic interference structure provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of another anti-magnetic interference structure provided by the embodiment of the present application;

FIG. 5 is a schematic diagram of another anti-magnetic interference structure provided by the embodiment of the present application;

FIG. 6 is a schematic diagram of another anti-magnetic interference structure provided by the embodiment of the present application;

Fig. 7 is a schematic side view of a partial structure inside the anti-magnetic interference structure shown in Fig. 6;

FIG. 8 is a schematic top view of a partial structure inside the anti-magnetic interference structure shown in FIG. 6 .

Detailed ways

The technical solution in this application will be described below with reference to the accompanying drawings.

In the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations or illustrations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete manner.

In the embodiments of the present application, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features.

It is to be understood that the terminology used in describing the various described examples herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of various stated examples, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

In this application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .

It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and/or" is an association relationship describing associated objects, which means that there may be three kinds of relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists independently. situation. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

It should also be understood that in this application, unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a sliding connection, or a detachable connection, Or become one, etc.; it can be directly connected or indirectly connected through an intermediary.

It is also to be understood that the term "comprises" (also "includes", "including", "comprises" and/or "comprising") when used in this specification designates the presence of stated features, integers, steps, operations, elements , and/or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groupings thereof.

It should be understood that "an embodiment", "another embodiment" and "a possible design" mentioned throughout the specification mean that specific features, structures or characteristics related to the embodiment or implementation are included in this document. In at least one embodiment of the application. Therefore, "in one embodiment of the present application" or "in another embodiment of the present application" and "a possible design" appearing in the entire specification do not necessarily refer to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

Before writing the embodiment of this application, it should be noted that the interference line in the embodiment of this application refers to the wiring or device in the electronic device that will interfere with the normal operation of the speaker, such as the circuit in the device around the speaker wires, or the wires laid out around the speaker. In the embodiment of this application, only one general interference wire is used as an example to illustrate the interference wires around the speaker. In practical applications, there may be multiple wires that interfere with the speaker, but Its principle is the same as the interference line introduced in this application.

In order to facilitate the understanding of the technical solution of this application, before writing the embodiment of this application, the technical background related to the technical solution of this application, that is, the principle of electromagnetic interference to speakers/earpieces in existing electronic equipment and some existing The anti-electromagnetic interference technology is briefly introduced.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a speaker 1 in an electronic device in the prior art subjected to electromagnetic interference. As shown in FIG. 1 , the electronic device includes a speaker 1 and an amplifier 4. The speaker 1 is electrically connected to the amplifier 4. There are generally other traces around the speaker 1. There are varying currents passing through these traces, thereby generating varying The low-frequency interference magnetic field, these routings that will generate the interference magnetic field are called the interference line 2 , in the embodiment of the present application, an interference line 2 is taken as an example to illustrate the influence of the interference line 2 on the speaker 1 . When the speaker 1 is in the process of playing or standing still, and there is a changing current in the interference line 2, a low-frequency interference magnetic field will be formed around the speaker 1, and the coil in the speaker 1 (such as a moving coil) is affected by these changes. Under the influence of the low-frequency disturbance magnetic field, the low-frequency alternating current will be induced. When the sensed low-frequency alternating current reaches a certain magnitude, it will push the speaker 1 to emit an interference sound, and such interference sound is often harmful to the audio signal. If the current changes within the audio frequency range, the human ear can hear the corresponding audio noise interference. When using a low-impedance speaker 1, since the effective magnetic induction area of the moving coil of the speaker 1 is relatively large, and the loop impedance formed by the coil and the circuit driving the coil is relatively small, the audio noise induced by this magnetic field will more easily reach the human ear. Perceived loudness, which affects audio quality.

Referring to FIG. 2 , FIG. 2 is a schematic diagram of anti-electromagnetic interference of a speaker 1 in an electronic device in the prior art. As shown in FIG. 2 , in the prior art, a 6-32 ohm resistor is connected in series in the circuit of the loudspeaker 1 in order to solve the effect of the interference magnetic field, and a bypass switch is connected in parallel with the resistor. When the speaker 1 is in the handset mode, the bypass switch is disconnected, and the resistor is connected in series in the circuit of the speaker 1 to reduce the current induced by the interfering magnetic field on the coil of the speaker 1, thereby reducing the noise caused by the induced current . When the loudspeaker 1 is in the loudspeaker mode, the bypass switch connected in parallel to the resistor can be turned on, so that the resistor is short-circuited, so that the volume of the loudspeaker 1 can meet the requirement.

In the technical solution shown in FIG. 2 , the bypass switch may use a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or other forms of on-off controllers. However, in the solution shown in Figure 2, when the speaker 1 is in the handset mode, the resistor connected in series in the loop of the speaker 1 will consume additional power consumption, causing the volume to drop or the power consumption to rise, and the non-linearity caused by the electronic switch Distortion affects audio specifications while adding complexity and cost to the circuit.

In order to solve the influence of the interference magnetic field in the electronic device on the speaker 1, and not cause too much influence on the sound quality of the speaker 1. The embodiment of the present application provides an anti-magnetic interference structure, which can generate a new current, which can offset the current generated by the interfering magnetic field on the coil, thereby greatly reducing the impact of the interfering magnetic field on the speaker 1 / Interference amplitude of the earpiece.

An embodiment of the present application provides an electronic device. The electronic devices include, for example, cell phones, tablet computers, smart watches, desktops, laptops, handheld computers, notebook computers, ultra-mobile personal computers (UMPCs), netbooks, as well as cellular phones, personal digital assistants (personal digital assistant, PDA), augmented reality (augmented reality, AR)\virtual reality (virtual reality, VR) equipment, etc. The electronic device includes a loudspeaker 1/earpiece. There is a metal coil in the loudspeaker 1/earpiece. Circuits are arranged around the loudspeaker 1/earpiece, and a changing current passes through the circuit. Speaker 1/earpiece will be interfered by the changing low-frequency magnetic field generated by the surrounding lines during the playback or static process. The embodiment of the present application does not specifically limit the specific form of the foregoing electronic device. The following is an introduction to the anti-magnetic interference structure in electronic equipment.

Referring to FIG. 3 , FIG. 3 is a schematic diagram of an anti-magnetic interference structure provided by an embodiment of the present application. As shown in FIG. 3 , the anti-magnetic interference structure in the embodiment of the present application includes a loudspeaker 1 , an interference wire 2 located near the loudspeaker 1 and a metal conductor. The loudspeaker 1 is generally also connected to an amplifier 4 . Wherein, the metal conductor is a metal wire 5 , and an alternating current passes through the interfering wire 2 , so that the interfering wire 2 generates an interfering magnetic field near the speaker 1 . The loudspeaker 1 includes a first metal coil 3, the metal wire 5 is connected in series with the first metal coil 3 in the loudspeaker 1, the first metal coil 3 will induce a first induced current (interference current) in the disturbing magnetic field, and the metal The wire 5 will induce a second induced current in the disturbing magnetic field. Wherein, the flow direction of the first induced current is to flow from the first end of the first metal coil 3 to the second end of the first metal coil 3, and the flow direction of the second induced current is to flow from the first end of the metal wire 5 to the metal wire 5 second end. When the first metal coil 3 and the metal wire 5 are connected in series, the second end of the first metal coil 3 is connected to the second end of the metal wire 5, so that the flow directions of the first induced current and the second induced current in the circuit are opposite, Therefore, the second induced current and the first induced current can cancel each other out, and the current after the offset is smaller than the current before the offset (the first induced current), which can reduce the influence of the interference current on the audio, thereby reducing the interference of the interference magnetic field on the speaker 1 magnitude.

Generally, there is a certain distance between the interfering wire 2 and the first coil in the loudspeaker 1, and the first coil has a larger induction current than the metal wire 5 under the same magnetic field conditions. Therefore, when the metal wire 5 is arranged, the metal wire 5 can be arranged close to the interference wire 2 .

In the embodiment of the present application, the metal wire 5 is arranged close to the interference wire 2, so that the interference magnetic field where the metal wire 5 is located is stronger than the intensity of the interference magnetic field where the first coil in the speaker 1 is located, so that the interference on the metal wire 5 is as far as possible. The magnitude of the generated second induced current is closer to the magnitude of the first induced current generated in the first coil, so that the second induced current can offset the first induced current as much as possible to reduce the interference caused by the interfering magnetic field to the speaker 1 . In addition, the metal wire 5 and the interference wire 2 can also be arranged in parallel, so that the second induced current generated by the metal wire 5 can be closer to the magnitude of the first induced current, and it is also convenient for wiring in the electronic device.

Wherein, the arrangement of the metal wire 5 close to the interference wire 2 means that the distance between the metal wire 5 and the interference wire 2 is less than or equal to the first preset distance. Wherein, the first preset distance may be determined according to the magnitude of the first induced current generated in the first coil and the spatial position on the circuit board. The main purpose of setting the metal wire 5 close to the interference line 2 is to make the size of the second induced current as close as possible to the size of the first induced current, so as to offset the interference generated by the first induced current. Those skilled in the art can follow this principle, to set the size of the first preset distance.

Based on the principle shown in FIG. 3 , the embodiment of the present application also provides another anti-magnetic interference structure. Referring to FIG. 4 , FIG. 4 is a schematic diagram of another anti-magnetic interference structure provided by an embodiment of the present application. As shown in FIG. 4 , the anti-magnetic interference structure in this embodiment includes a loudspeaker 1 , an interference wire 2 near the loudspeaker 1 and a metal conductor. The loudspeaker 1 is generally connected with an amplifier 4 , and the metal conductor is a metal coil. In order to distinguish it from the first metal coil 3 in the loudspeaker 1 , this coil is called a second metal coil 6 .

The speaker 1 includes a first metal coil 3, the first metal coil 3 in the speaker 1 is connected in series with the second metal coil 6, the first metal coil 3 will induce a first induced current (interference current) in the disturbance magnetic field , the second metal coil 6 will induce a second induced current in the disturbing magnetic field. Wherein, the flow direction of the first induced current is to flow from the first end of the first metal coil 3 to the second end of the first metal coil 3, and the flow direction of the second induced current is to flow from the first end of the second metal coil 6 to the metal wire 5 on the second end. When the first metal coil 3 and the second metal coil 6 are connected in series, the second end of the first metal coil 3 is connected to the second end of the second metal coil 6, so that the first induced current and the second induced current flow through the speaker 1 The flow in the circuit is opposite, so that the second induction current can offset the intensity of the first induction current, so that the offset current intensity is smaller than the intensity of the first induction current, reducing the influence of the interference current on the audio, thereby reducing the impact of the interference magnetic field on the Interference magnitude for speaker 1.

When the second metal coil 6 is set, the second metal coil 6 can also be arranged close to the interference line 2, and the second metal coil 6 can be placed close to the interference line 2, so that it can be placed in a stronger interference magnetic field, so that when the second metal coil 6 is set When the structure of the two metal coils 6 is used, the size of the second metal coil 6 can be set to be smaller or the number of turns is less, so as to facilitate the layout in the electronic device. Wherein, setting the second metal coil 6 close to the interference line 2 means that the distance between the second metal coil 6 and the interference line 2 is less than or equal to the second preset distance. Wherein, the second preset distance can be determined according to the magnitude of the first induced current generated in the first coil and the spatial position on the circuit board. The main purpose of arranging the second metal coil 6 close to the interference line 2 is to make the magnitude of the second induced current as close as possible to the magnitude of the first induced current, so as to offset the interference generated by the first induced current.

Specifically, the number of turns and the position (the second preset distance) of the second metal coil 6 can be determined according to the magnitude of the first induced current, and by selecting an appropriate number of turns and position of the coil, the second metal coil 6 The magnitude of the induced second induced current may be close to the magnitude of the first induced current. Wherein, the magnitude of the second induced current may be close to the magnitude of the first induced current may refer to: the magnitude of the second induced current is 20%-180% of the magnitude of the first induced current. In the embodiment of the present application, when the current after the cancellation of the second induction current and the first induction current is smaller than the first induction current, the effect of reducing interference can be realized, but the smaller the current after the cancellation of the second induction current and the first induction current The better the anti-interference effect is, when the offset current is 0, the anti-interference effect is the best.

In addition, when setting the second metal coil 6, the second metal coil 6 can also be arranged parallel to the interference line 2. Specifically, the arrangement of the second metal coil 6 parallel to the interference line 2 refers to the central line of the second metal coil 6 Parallel to interference line 2. Arranging them in parallel can facilitate the wiring in the electronic device, and make it generate enough second induced current to offset the first induced current. The embodiment of the present application does not limit its specific location settings, and those skilled in the art can make adjustments according to actual needs.

In practical applications, there may be no extra space on the circuit board for arranging the second metal coil 6 due to the limitation of the layout of components inside the electronic device and the spatial position. In this case, the embodiment of the present application provides another solution. Referring to FIG. 5 , FIG. 5 is a schematic diagram of another anti-magnetic interference structure provided by an embodiment of the present application. As shown in FIG. 5 , when the second metal coil 6 is set, the second metal coil 6 is set on a circuit board, which is called the first circuit board 7 for easy distinction. The first circuit board 7 can be a flexible circuit board, which is generally independent of the circuit board in the electronic device, and then the second metal coil 6 arranged on the first circuit board 7 is arranged at a position close to the interference wire 2 . The difference between the anti-magnetic interference structure shown in Figure 5 and the anti-magnetic interference structure shown in Figure 4 is that in the anti-magnetic interference structure of Figure 5, the second metal coil 6 is arranged on a dedicated first circuit board 7, so as to solve There is no problem that the circuit board in the electronic device has no space to install the second metal coil 6 . As for the setting of other structures, such as the number of turns of the second metal coil 6 and the specific position of the second metal coil 6 , reference may be made to the relevant description of the structure shown in FIG. 4 .

The solution introduced in the above-mentioned embodiment is mainly through connecting a metal conductor in series in the circuit structure of the loudspeaker 1, and the metal conductor can be a metal wire 5 or a metal coil (the second metal coil 6 in the above-mentioned embodiment, and The second metal coil 6) arranged on the flexible circuit board, through the reverse connection of the metal conductor, makes the induced current generated by the metal conductor in the disturbing magnetic field, and the induced current generated by the first metal coil 3 in the speaker 1 in the disturbing magnetic field The magnitudes are similar and the directions are opposite, so as to cancel each other, so as to reduce the influence of the current generated by the first metal coil 3 in the loudspeaker 1 in the disturbing magnetic field on the audio frequency.

In addition, the present application also provides another technical solution to solve the influence of the interference magnetic field generated by the interference wire 2 on the speaker 1 . Referring to FIG. 6 , FIG. 6 is a schematic diagram of another anti-magnetic interference structure provided by an embodiment of the present application. As shown in FIG. 6 , the anti-magnetic interference structure in this embodiment includes a loudspeaker 1 , an interference wire 2 located near the loudspeaker 1 and a circuit board. The loudspeaker 1 is generally connected to an amplifier 4 . Wherein, the loudspeaker 1 includes a first metal coil 3, and the first metal coil 3 is symmetrical about its center line. For ease of distinction, this circuit board is called a second circuit board (not shown in the figure), and the circuit board used for setting the speaker 1 in the electronic device is called a third circuit board. The second circuit board can be a flexible circuit board, and the interference line 2 is arranged on the second circuit board. The position of the second circuit board is adjusted so that the interfering line 2 on the second circuit board and the center line of the first metal coil 3 are located on the same plane, and the plane bisects the first metal coil 3 .

Specifically, in the interior of the electronic device, since the speaker 1 is generally arranged on the third circuit board in the electronic device, the third circuit board in the electronic device is generally fixed on the housing or the middle frame of the electronic device. In case of the second circuit board, the second circuit board may be arranged above the third circuit board in the electronic device. Referring to Fig. 7 and Fig. 8, Fig. 7 is a schematic side view of a part of the internal structure of the anti-magnetic interference structure shown in Fig. 6, and Fig. 8 is a schematic top view of a part of the internal structure of the anti-magnetic interference structure shown in Fig. 6, Fig. 7, Fig. 8 shows the positional relationship between the interference wire 2 and the first metal coil 3 . As shown in Figure 7 and Figure 8, the interference line 2 is arranged above the first metal coil 3, and the interference line 2 intersects with the center line of the first metal coil 3, that is, the intersecting line 2 and the first metal coil 3 The center lines lie in the same plane, which divides the first metal coil 3 into two parts: a first part and a second part. Through the physical layout, the interference line 2 intersects the center line of the first metal coil 3, and the interference magnetic field generated by the interference line 2 is also symmetrical about the plane, that is, the magnetic field lines passing through the first part of the first metal coil 3 The number of magnetic flux lines passing through the second part of the first metal coil 3 is the same, but the direction of the magnetic flux lines passing through the first part and the second part of the first metal coil 3 is opposite, therefore, in theory, the disturbance magnetic field Inductive currents with the same magnitude and opposite directions will be generated in the first part and the second part of the first metal coil 3 , that is, the total induced current generated by the interference magnetic field on the first metal coil 3 is zero. In practical application, due to the processing error of the first metal coil 3, the position error of the interference line 2 and other factors, it is impossible to reduce the induced current on the first metal coil 3 to 0, but compared to the interference in the prior art The arrangement of the wire 2, through the above arrangement, can reduce the induced current on the first metal coil 3 by more than 90%, effectively reducing the influence of the interfering magnetic field on the speaker 1.

In the solution provided in this embodiment, by laying out the interference wire 2 that interferes with the speaker 1 on the second circuit board, and then flexibly adjusting the position of the second circuit board, the interference wire 2 and the first metal coil 3 The centerlines intersect, that is, the plane where the interference line 2 and the center line are located bisects the first metal coil 3, so that the interference magnetic field generated by the interference line 2 is evenly distributed on both sides of the plane where the interference line 2 and the center line are located, and The directions of the magnetic fields on both sides are opposite, so that the induced current generated by the disturbing magnetic field on the first metal coil 3 is zero or close to zero, or smaller than the magnitude of the current generated in the prior art solution (less than the first induced current). This solution does not add complicated circuit structures or electronic components, but only adjusts the layout of the interference line 2 near the speaker 1, which produces a good anti-interference effect and low cost.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

While the preferred embodiments of the embodiments of the present application have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is understood. Therefore, the protection scope of the present application includes the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

The anti-magnetic interference structure and electronic equipment provided by this application have been introduced in detail above. In this paper, specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only used to help understand this application. The method of application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood For the limitation of this application.

The above content is only the specific implementation of the application, but the protection scope of the application is not limited thereto, and any changes or replacements within the technical scope disclosed in the application shall be covered within the protection scope of the application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (10)

1. An anti-magnetic interference structure, comprising a loudspeaker and an interfering wire, comprising a first metal coil in the loudspeaker, the interfering wire can generate an interfering magnetic field, it is characterized in that it also includes a metal conductor, and the metal conductor is set Outside the speaker, the metal conductor is arranged in parallel with the interference wire, and the metal conductor is connected in series with the first metal coil; The first metal coil induces a first induction current in the disturbance magnetic field, and the metal conductor induces a second induction current in the disturbance magnetic field; The direction of the second induction current is opposite to the direction of the first induction current, and the difference between the magnitude of the second induction current and the magnitude of the first induction current is smaller than the magnitude of the first induction current. 2. The structure according to claim 1, wherein the magnitude of the second induced current is 20%-180% of the magnitude of the first induced current. 3. The structure according to claim 2, wherein the magnitude of the second induced current is the same as that of the first induced current. 4. The structure according to any one of claims 1 to 3, wherein the metal conductor is a straight metal wire, the straight metal wire is arranged parallel to the interference line, and the straight metal wire The distance between the conductor and the interference line is less than or equal to a first preset distance. 5. The structure according to any one of claims 1 to 3, wherein the metal conductor is a second metal coil, and the distance between the second metal coil and the interference line is smaller than a second preset distance. 6. The structure of claim 5, wherein the center line of the second metal coil is parallel to the interference line. 7. The structure according to claim 5, wherein the second metal coil is disposed on a circuit board. 8. The structure according to claim 7, wherein the circuit board is a flexible circuit board. 9. An anti-magnetic interference structure, comprising a loudspeaker and an interfering wire, the loudspeaker includes a first metal coil, the first metal coil is symmetrical about its center line, and the interfering wire will generate an interfering magnetic field, characterized in that , further comprising a circuit board, the interference line is arranged on the circuit board, the plane where the interference line and the center line of the first metal coil are bisects the first metal coil, and the plane divides the first metal coil A metal coil is equally divided into a first part and a second part, the disturbance magnetic field induces a first induced current in the first part of the first metal coil, and the disturbance magnetic field induces a first induction current in the second part of the first metal coil The second induced current, the first induced current and the second induced current have the same magnitude and opposite directions. 10. An electronic device, comprising the anti-magnetic interference structure according to any one of claims 1-9.

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