CN115226010B - Anti-magnetic interference structure and electronic equipment - Google Patents
Anti-magnetic interference structure and electronic equipment Download PDFInfo
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- CN115226010B CN115226010B CN202211091617.XA CN202211091617A CN115226010B CN 115226010 B CN115226010 B CN 115226010B CN 202211091617 A CN202211091617 A CN 202211091617A CN 115226010 B CN115226010 B CN 115226010B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
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- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
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Abstract
The application discloses anti-magnetic interference structure and electronic equipment relates to terminal equipment technical field. The structure comprises a loudspeaker and an interference wire, wherein the loudspeaker comprises a first metal coil, the interference wire can generate an interference magnetic field, and the structure also comprises a metal conductor, and the metal conductor is connected with the first metal coil in series. The first metal coil and the metal conductor respectively induce a first induced current and a second induced current in the interference magnetic field, the direction of the second induced current is opposite to that of the first induced current, and the difference between the magnitude of the second induced current and the magnitude of the first induced current is smaller than that of the first induced current. According to the structure, a metal conductor is connected in series in a circuit where a first metal coil of the loudspeaker is located, and a second induced current generated by the metal conductor is opposite to a first induced current generated by the first metal coil in flow direction, so that the second induced current and the first induced current are mutually offset, and the influence of the first induced current on the loudspeaker is reduced.
Description
Technical Field
The application relates to the field of terminal equipment, in particular to an anti-magnetic interference structure and electronic equipment.
Background
In the existing terminal equipment, a loudspeaker or an earphone is generally arranged, in the process of sound reproduction or standing, a moving coil loudspeaker or an earphone (Receiver, RCV) is easily interfered by a low-frequency magnetic field changing around, low-frequency alternating current is induced on a coil, and when the current reaches a certain magnitude, the loudspeaker or the RCV is pushed to emit interference sound which is harmful to audio signals.
If the current variation is in the audio frequency range, the human ear can hear the corresponding audio frequency noise interference. When a low-impedance loudspeaker is used as the RCV, the effective magnetic induction area of a moving coil of the loudspeaker is large, and the loop impedance formed by the coil and a circuit of a driving coil is small, so that the audio noise induced by the magnetic field can reach the loudness which can be perceived by human ears more easily.
Therefore, the audio noise generated by the interfering magnetic field has become a problem to be solved in the terminal equipment.
Disclosure of Invention
The application provides an anti-magnetic interference structure and electronic equipment, the anti-magnetic interference structure can generate a new current, and the new current can be offset with a current generated by an interference magnetic field on a coil, so that the interference amplitude of the interference magnetic field on a loudspeaker/receiver is greatly reduced.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, an anti-magnetic interference structure is provided, which includes a speaker and an interference line, the speaker includes a first metal coil, the interference line generates an interference magnetic field, and a metal conductor connected in series with the first metal coil. Wherein the first metal coil induces a first induced current in the disturbing magnetic field and the metal conductor induces a second induced current in the disturbing magnetic field. The direction of the second induced current is opposite to that of the first induced current, and the difference between the magnitude of the second induced current and the magnitude of the first induced current is smaller than that of the first induced current.
On the basis, a metal conductor is connected in series in a circuit where a first metal coil of the loudspeaker is located, and the metal conductor can generate induced current in an interference magnetic field, so that the second induced current generated by the metal conductor and the first induced current generated by the first metal coil in the interference magnetic field are opposite in flow direction in a reverse connection mode, the second induced current and the first induced current are mutually offset, and the influence of the first induced current on the loudspeaker can be reduced because the difference between the magnitude of the second induced current and the magnitude of the first induced current is smaller than the magnitude of the first induced current. The more the second induced current and the first induced current cancel out, the less the influence of the disturbing line on the loudspeaker.
In a possible design manner of the first aspect, the metal conductor is a metal wire, the metal wire is disposed in parallel with the interference line, and a distance between the metal wire and the interference line is smaller than or equal to a first preset distance.
On this basis, set up metal conductor as a metal wire, it is one of its embodiment, metal wire has little, advantage such as the overall arrangement is nimble, through setting up that the distance between metal wire and the interference line is less than or equal to first preset distance for metal wire can be close to the interference line setting, thereby make the size of the second induced current that produces in the metal wire can be close to the size of first induced current as far as possible, with metal wire and interference line parallel arrangement, also can play the effect that makes the size of second induced current close to the size of first induced current as far as possible.
In a possible design of the first aspect, the metal conductor is a second metal coil, and a distance between the second metal coil and the interference line is smaller than a second preset distance.
On this basis, it is another specific embodiment of the present invention to provide the metal conductor as a second metal coil, and the second metal coil has a stronger magnetic induction capability than the metal wire, and can induce a stronger second induced current. The distance between the second metal coil and the interference line is smaller than or equal to a second preset distance, so that the second metal coil can be arranged close to the interference line, and the size of a second induced current generated in the metal lead can be close to the size of the first induced current as much as possible.
In a possible embodiment of the first aspect, the center line of the second metal coil is parallel to the interference line. The design mode is a specific arrangement mode of the second metal coil, and the second metal coil can be arranged in a placement mode according to needs.
In a possible embodiment of the first aspect, the second metal coil is disposed on a circuit board.
On this basis, through setting up second metal coil on a circuit board, can avoid second metal coil to occupy the space on the circuit board among the electronic equipment, can adjust the position of second metal coil in a flexible way.
In a second aspect, an anti-magnetic interference structure is provided, which includes a speaker and an interference line, the speaker includes a first metal coil, the first metal coil is symmetrical with respect to a center line of the first metal coil, the interference line generates an interference magnetic field, and the anti-magnetic interference structure further includes a circuit board, the interference line is disposed on the circuit board, and a plane where the interference line and the center line of the first metal coil are located bisects the first metal coil.
On the basis, an interference line which causes interference on the loudspeaker is arranged on a circuit board, and the position of the circuit board is flexibly adjusted, so that the plane where the interference line and the center line of the first metal coil are located bisects the first metal coil, interference magnetic fields generated by the interference line are uniformly distributed on two sides of the plane where the interference line and the center line are located, the directions of the magnetic fields on the two sides are opposite, and induced currents generated by the interference magnetic fields on the first metal coil are 0 or close to 0. On the basis of not increasing complex circuit structures or electronic elements, the layout of the interference lines near the loudspeaker is only adjusted, namely, a good anti-interference effect is generated, and the cost is low.
In a third aspect, an electronic device is provided, which includes the anti-magnetic interference structure provided in the first aspect, the second aspect, or any possible design manner thereof.
It can be understood that, the beneficial effects 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 one of the possible design manners thereof, and are not described herein again.
Drawings
Fig. 1 is a schematic diagram of a speaker in an electronic device in the prior art, which is subject to electromagnetic interference;
FIG. 2 is a schematic diagram of anti-electromagnetic interference of a speaker in an electronic device according to the prior art;
FIG. 3 is a schematic diagram of an anti-magnetic interference structure according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another anti-magnetic interference structure provided in an embodiment of the present application;
FIG. 5 is a schematic diagram of another anti-magnetic interference structure provided in an embodiment of the present application;
FIG. 6 is a schematic diagram of another anti-magnetic interference structure provided in an embodiment of the present application;
FIG. 7 is a schematic side view of a portion of the structure inside the anti-magnetic interference structure shown in FIG. 6;
fig. 8 is a schematic top view of a part of the structure inside the anti-magnetic interference structure shown in fig. 6.
Detailed Description
The technical solution in the present 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 to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.
In the embodiments of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
It is to be understood that the terminology used in the description of 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 the various illustrated examples, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may 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 associative relationship that describes an associated object, meaning that three relationships may exist, e.g., A and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in the present application generally indicates that the former and latter related objects are in an "or" relationship.
It is also to be understood that, unless expressly stated or limited otherwise, the term "coupled" is to be interpreted broadly, as it may be, for example, a fixed connection, a sliding connection, a removable connection, an integral part, or the like; may be directly connected or indirectly connected through an intermediate.
It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should be appreciated that reference throughout this specification to "one embodiment," "another embodiment," or "one possible design" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment of the present application" or "in another embodiment of the present application" or "in one possible design" in various places throughout this specification are not necessarily all referring 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 embodiments of the present application, it should be noted that the interference line in the embodiments of the present application refers to a trace or a device in an electronic device that may cause interference to normal operation of a speaker, for example, a circuit line in a device disposed around the speaker, or a trace laid out around the speaker.
To facilitate understanding of the technical solutions of the present application, before writing the embodiments of the present application, a brief description is made of technical background related to the technical solutions of the present application, that is, the principle of generating electromagnetic interference for a speaker/earpiece in an existing electronic device and some existing technologies for resisting electromagnetic interference.
Referring to fig. 1, fig. 1 is a schematic diagram of a speaker 1 in an electronic device according to the prior art, which is subjected to electromagnetic interference. As shown in fig. 1, in an electronic device, including 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, in which a current that changes passes through the traces, so as to generate a changing low-frequency interference magnetic field, and these traces that will generate the interference magnetic field are referred to as interference lines 2, in this embodiment, one interference line 2 is taken as an example to describe the influence of the interference line 2 on the speaker 1. When the loudspeaker 1 is in a playing or standing process and a changing current flows in the interference wire 2, a low-frequency interference magnetic field is formed around the loudspeaker 1, and a coil (such as a moving coil) in the loudspeaker 1 is influenced by the changing low-frequency interference magnetic field, so that a low-frequency alternating current is induced. When the sensed low frequency alternating current reaches a certain level, it will push the loudspeaker 1 to emit disturbing sounds, which are often harmful to the audio signal. If the current variation is in the audio frequency range, the human ear can hear the corresponding audio frequency noise interference. When the loudspeaker 1 with low impedance is used, the effective magnetic induction area of the moving coil of the loudspeaker 1 is large, and the loop impedance formed by the coil and the circuit of the driving coil is small, so that the audio noise induced by the magnetic field can reach the loudness which can be perceived by human ears more easily, and the audio quality is influenced.
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 order to solve the effect of the magnetic interference field in the prior art, a resistor of 6-32ohm is connected in series in the loop of the speaker 1, and a bypass switch is connected in parallel to the resistor. When the loudspeaker 1 is in the earphone mode, the bypass switch is switched off, and the resistor is connected in series in a loop of the loudspeaker 1, so that the current induced on a coil of the loudspeaker 1 by an interference magnetic field is reduced, and the noise caused by the induced current is reduced. When the loudspeaker 1 is in the play-out mode, the bypass switch connected in parallel to the resistor can be opened, so that the resistor is short-circuited, and the play-out volume of the loudspeaker 1 meets the requirement.
In the solution shown in fig. 2, the bypass switch may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or other types of on-off controllers. However, in the scheme shown in fig. 2, when the speaker 1 is in the earpiece mode, the resistor connected in series in the loop of the speaker 1 consumes additional power, so that the volume is decreased or the power consumption is increased, and the audio index is affected by the nonlinear distortion caused by the electronic switch, which increases the complexity and cost of the circuit.
In order to solve the problem of the influence of interference magnetic field on the loudspeaker 1 in the electronic equipment, and not to greatly influence the sound quality of the loudspeaker 1. The embodiment of the application provides an anti-magnetic interference structure, which can generate a new current, and the new current can cancel the current generated by the interference magnetic field on the coil, so that the interference amplitude of the interference magnetic field on the loudspeaker 1/receiver is greatly reduced.
The embodiment of the application provides electronic equipment. The electronic devices include, for example, cell phones, tablet computers, smart watches, desktop, laptop, handheld computers, notebook computers, ultra-mobile personal computers (UMPCs), netbooks, and cellular phones, personal Digital Assistants (PDAs), augmented Reality (AR) devices, virtual Reality (VR) devices, and the like. The electronic equipment comprises a loudspeaker 1/earphone, wherein the loudspeaker 1/earphone is internally provided with a metal coil, a circuit is arranged around the loudspeaker 1/earphone, and current with change in the circuit passes through the circuit. The loudspeaker 1/receiver is disturbed by the changing low-frequency magnetic field generated by the surrounding lines in the process of playing or standing. The embodiment of the present application does not specifically limit the specific form of the electronic device. The following describes an anti-magnetic interference structure in an electronic device.
Referring to fig. 3, fig. 3 is a schematic diagram of an anti-magnetic interference structure according to 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 speaker 1, an interference line 2 located near the speaker 1, and a metal conductor. An amplifier 4 is also typically connected to the loudspeaker 1. The metal conductor is a metal wire 5, and alternating current passes through the interference line 2, so that the interference line 2 can generate an interference magnetic field near the loudspeaker 1. The loudspeaker 1 comprises a first metal coil 3, a metal wire 5 is connected in series with the first metal coil 3 in the loudspeaker 1, the first metal coil 3 induces a first induced current (interference current) in the interference magnetic field, and the metal wire 5 induces a second induced current in the interference magnetic field. The first induced current flows from the first end of the first metal coil 3 to the second end of the first metal coil 3, and the second induced current flows from the first end of the metal wire 5 to the second end of the metal wire 5. 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 with the second end of the metal wire 5, so that the flow directions of the first induction current and the second induction current in the circuit are opposite, the second induction current and the first induction current can be mutually counteracted, the influence of the interference current on the audio frequency can be reduced when the counteracted current is smaller than the current before the counteraction (the first induction current), and the interference amplitude of the interference magnetic field on the loudspeaker 1 can be reduced.
The disturbing line 2 is typically at a distance from the first coil in the loudspeaker 1, and the first coil is arranged relative to the metal wire 5 such that under the same magnetic field conditions the first coil induces a stronger current than the metal wire 5, so that the metal wire 5 can be arranged close to the disturbing line 2 when the metal wire 5 is arranged.
In the embodiment of the present application, the metal wire 5 is disposed close to the interference wire 2, so that the interference magnetic field where the metal wire 5 is located is stronger than the interference magnetic field where the first coil is located in the speaker 1, and thus the magnitude of the second induced current generated on the metal wire 5 is made as close as possible to the magnitude of the first induced current generated in the first coil, so that the second induced current can counteract the first induced current as possible, and interference of the interference magnetic field on the speaker 1 is reduced. In addition, the metal wire 5 and the interference wire 2 can be arranged in parallel, so that the second induced current generated by the metal wire 5 can be closer to the first induced current, and meanwhile, the wiring in the electronic equipment is convenient.
Wherein, the metal wire 5 is arranged close to the interference wire 2, which means that: the distance between the metal wire 5 and the interference wire 2 is smaller than or equal to a first preset distance. The first preset distance may be determined according to a magnitude of a first induced current generated in the first coil and a spatial position on the circuit board. The main purpose of placing the metal conductor 5 close to the disturber line 2 is: the magnitude of the second induced current is as close as possible to the magnitude of the first induced current to counteract the interference generated by the first induced current, and those skilled in the art can set the magnitude of the first preset distance according to this principle.
Based on the principle shown in fig. 3, the embodiment of the present application further provides another structure for resisting magnetic interference. Referring to fig. 4, fig. 4 is a schematic diagram of another anti-magnetic interference structure provided in the embodiment of the present application. As shown in fig. 4, the anti-magnetic interference structure in the present embodiment includes a speaker 1, an interference line 2 located near the speaker 1, and a metal conductor. The loudspeaker 1 is typically connected to an amplifier 4, and the metal conductor is a metal coil, which is called a second metal coil 6 for distinguishing from the first metal coil 3 in the loudspeaker 1.
The loudspeaker 1 comprises a first metal coil 3, the first metal coil 3 and a second metal coil 6 in the loudspeaker 1 are connected in series, the first metal coil 3 induces a first induced current (interference current) in an interference magnetic field, and the second metal coil 6 induces a second induced current in the interference magnetic field. The first induced current flows from the first end of the first metal coil 3 to the second end of the first metal coil 3, and the second induced current flows from the first end of the second metal coil 6 to the second end of the metal wire 5. 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 with the second end of the second metal coil 6, so that the flow directions of the first induction current and the second induction current in the circuit of the loudspeaker 1 are opposite, the strength of the first induction current can be counteracted by the second induction current, the counteracted current strength is smaller than that of the first induction current, the influence of the interference current on the audio frequency is reduced, and the interference amplitude of the interference magnetic field on the loudspeaker 1 is reduced.
When setting up second metal coil 6, also can be close to interference wire 2 with second metal coil 6 and set up, can make it be in stronger interference magnetic field for when setting up second metal coil 6's structure, can set up the size of second metal coil 6 littleer or the number of turns is less, in order to conveniently carry out the overall arrangement in electronic equipment. Wherein, the arrangement of the second metal coil 6 close to the interference wire 2 means that: the distance between the second metal coil 6 and the interference wire 2 is less than or equal to a second preset distance. The second preset distance may be determined according to a magnitude of the first induced current generated in the first coil and a spatial position on the circuit board. The main purpose of placing the second metal coil 6 close to the disturbing wire 2 is: the magnitude of the second induced current is close to that of the first induced current as much as possible so as to counteract the interference generated by the first induced current.
Specifically, the number of turns and the position (second preset distance) of the second metal coil 6 may be determined according to the magnitude of the first induced current, and the magnitude of the second induced current induced in the second metal coil 6 may be close to the magnitude of the first induced current by selecting an appropriate number of turns and position of the coil. The magnitude of the second induced current can be close to the magnitude of the first induced current by: the magnitude of the second induced current is 20% -180% of the magnitude of the first induced current. In the embodiment of the application, when the current obtained by offsetting the second induction current and the first induction current is smaller than the first induction current, the interference reduction effect can be realized, but the smaller the current obtained by offsetting the second induction current and the first induction current is, the better the anti-interference effect is, and when the current obtained by offsetting is 0, the best anti-interference effect is obtained.
When the second metal coil 6 is disposed, the second metal coil 6 may be disposed parallel to the interference line 2, specifically, when the second metal coil 6 is disposed parallel to the interference line 2, the central line of the second metal coil 6 is parallel to the interference line 2. Arranging them in parallel may facilitate wiring within the electronic device and cause them to generate sufficient second induced current to cancel the first induced current. The specific position setting of the device is not limited in the embodiment of the application, and the device can be adjusted by a person skilled in the art according to actual requirements.
In practical applications, the layout of components and the spatial position relationship inside the electronic device may be limited, and there may not be any extra space on the circuit board for disposing the second metal coil 6. In this case, the embodiment of the present application provides another solution. Referring to fig. 5, fig. 5 is a schematic view of another anti-magnetic interference structure provided in the embodiment of the present application. As shown in fig. 5, when the second metal coil 6 is provided, the second metal coil 6 is provided on a circuit board, which is referred to as a first circuit board 7 for convenience of distinction. The first circuit board 7 may be a flexible circuit board, typically a circuit board separate from the electronic device, and then the second metal coil 6 provided on the first circuit board 7 is disposed at a position close to the disturbing line 2. The structure of fig. 5 for resisting magnetic interference is different from the structure of fig. 4 in that in the structure of fig. 5 for resisting magnetic interference, the second metal coil 6 is disposed on a dedicated first circuit board 7, so as to solve the problem that the circuit board in the electronic device has no space for mounting the second metal coil 6. As for the arrangement 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 related description of the structure shown in fig. 4.
The solution described in the above embodiment is mainly to connect a metal conductor in series in the circuit structure of the speaker 1, where the metal conductor may be a metal wire 5 or a metal coil (the second metal coil 6 in the above embodiment, and the second metal coil 6 disposed on the flexible circuit board), and by connecting the metal conductor reversely, the induced current generated by the metal conductor in the interfering magnetic field is similar to and opposite to the induced current generated by the first metal coil 3 in the speaker 1 in magnitude and direction, so as to cancel each other, thereby reducing the influence of the current generated by the first metal coil 3 in the speaker 1 in the interfering magnetic field on the audio frequency.
Besides, the present application provides another technical solution to solve the influence of the disturbing magnetic field generated by the disturbing line 2 on the loudspeaker 1. Referring to fig. 6, fig. 6 is a schematic diagram of another anti-magnetic interference structure provided in an embodiment of the present application. As shown in fig. 6, the anti-magnetic interference structure in the present embodiment includes a speaker 1, an interference line 2 near the speaker 1, and a circuit board, and an amplifier 4 is generally connected to the speaker 1. The loudspeaker 1 includes a first metal coil 3 therein, and the first metal coil 3 is symmetrical about a center line thereof. For the sake of convenience of distinction, this circuit board is referred to as a second circuit board (not shown in the drawings), and a circuit board for disposing the speaker 1 in the electronic apparatus is referred to as a third circuit board. The second circuit board may be a flexible circuit board, and the interference wire 2 is disposed on the second circuit board. The position of the second circuit board is adjusted so that the interference line 2 on the second circuit board and the center line of the first metal coil 3 are on the same plane, and the plane bisects the first metal coil 3.
Specifically, inside the electronic device, since the speaker 1 is generally disposed on a third circuit board in the electronic device, the third circuit board in the electronic device is generally fixed on a housing or a middle frame of the electronic device, and when the second circuit board is disposed, the second circuit board may be disposed above the third circuit board in the electronic device. Referring to fig. 7 and 8, 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, and fig. 7 and 8 show a positional relationship between the interference wire 2 and the first metal coil 3. As shown in fig. 7 and 8, the interference line 2 is disposed 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 interference line 2 and the center line of the first metal coil 3 are located in the same plane, which bisects the first metal coil 3 into two parts: a first portion and a second portion. By physical layout, the interference line 2 intersects with the central 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 number of magnetic induction lines passing through the first part of the first metal coil 3 is the same as that of magnetic induction lines passing through the second part of the first metal coil 3, but the directions of the magnetic induction lines passing through the first part and the second part of the first metal coil 3 are opposite, so that theoretically, the interference magnetic field generates induced currents with the same magnitude and opposite directions 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, the induced current on the first metal coil 3 cannot be reduced to 0 due to the influence of factors such as the machining error of the first metal coil 3 and the position error of the interference wire 2, but compared with the arrangement mode of the interference wire 2 in the prior art, the arrangement mode can reduce the induced current on the first metal coil 3 by more than 90%, and effectively reduce the influence of the interference magnetic field on the loudspeaker 1.
In the solution provided in this embodiment, the interference line 2 that causes interference to the speaker 1 is laid on the second circuit board, and then the position of the second circuit board is flexibly adjusted, so that the interference line 2 intersects with the center line of the first metal coil 3, 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 fields generated by the interference line 2 are uniformly distributed on two sides of the plane where the interference line 2 and the center line are located, and the directions of the magnetic fields on the two sides are opposite, so that the induced current generated by the interference magnetic field on the first metal coil 3 is 0 or close to 0, or smaller than the magnitude of the current generated in the prior art (smaller than the first induced current). According to the scheme, a complex circuit structure or electronic elements are not added, the layout of the interference lines 2 near the loudspeaker 1 is only adjusted, a good anti-interference effect is achieved, and the cost is low.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the scope of protection of the present application includes the preferred embodiments and all variations and modifications that fall within the scope of the embodiments of the present application.
The foregoing detailed description is directed to an anti-magnetic interference structure and an electronic device provided in the present application, and specific examples are applied herein to explain the principles and embodiments of the present application, and the descriptions of the foregoing examples are only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An anti-magnetic interference structure comprises a loudspeaker and an interference line, wherein the loudspeaker comprises a first metal coil, the interference line can generate an interference magnetic field, and the anti-magnetic interference structure is characterized by further comprising a metal conductor, the metal conductor is arranged outside the loudspeaker, the metal conductor and the interference line are arranged in parallel, and the metal conductor and the first metal coil are connected in series;
the first metal coil induces a first induced current in the interfering magnetic field, and the metal conductor induces a second induced current in the interfering magnetic field;
the direction of the second induced current is opposite to that of the first induced current, and the difference between the magnitude of the second induced current and the magnitude of the first induced current is smaller than that of the first induced current.
2. The structure of claim 1, wherein the magnitude of the second induced current is 20% -180% of the magnitude of the first induced current.
3. The structure of claim 2, wherein the magnitude of the second induced current is the same as the magnitude of the first induced current.
4. The structure of any one of claims 1 to 3, wherein the metal conductor is a linear metal wire, the linear metal wire is arranged in parallel with the interference line, and the distance between the linear metal wire and the interference line is smaller than or equal to a first preset distance.
5. The structure according to any one of claims 1 to 3, characterized in that the metal conductor is a second metal coil, the distance between the second metal coil and the disturbing line being smaller than a second predetermined distance.
6. The structure of claim 5, wherein a centerline of the second metal coil is parallel to the disturbance line.
7. The structure of claim 5, wherein the second metal coil is disposed on a circuit board.
8. The structure of claim 7, wherein the circuit board is a flexible circuit board.
9. The utility model provides an anti-magnetic interference structure, includes speaker and interference line, including first metal coil in the speaker, first metal coil is symmetrical about its central line, the interference line can produce an interference magnetic field, a serial communication port, still include a circuit board, the interference line set up in on the circuit board, the interference line with the plane at first metal coil central line place is equallyd divide first metal coil, the plane will first metal coil is equallyd divide into first part and second part, the interference magnetic field is in first induced-current is induced out to first metal coil's first part, the interference magnetic field is in second induced-current is induced out to first metal coil's second part, first induced-current with second induced-current size is the same, the opposite direction.
10. An electronic device, characterized in that it comprises an anti-magnetic interference structure according to any one of claims 1 to 9.
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| CN118233541A (en) * | 2022-12-21 | 2024-06-21 | 荣耀终端有限公司 | Circuit board and related device |
| CN118040317B (en) * | 2024-03-06 | 2024-08-16 | 荣耀终端有限公司 | Electronic equipment |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002204494A (en) * | 2000-12-28 | 2002-07-19 | Toshio Senho | Speaker |
| JP2007129665A (en) * | 2005-11-07 | 2007-05-24 | Sony Corp | Speaker apparatus |
| WO2013018458A1 (en) * | 2011-07-29 | 2013-02-07 | 株式会社日立製作所 | Surface current probe |
| CN204031441U (en) * | 2014-08-07 | 2014-12-17 | 北京七九七华音电子有限责任公司 | Loud speaker |
| CN204836574U (en) * | 2015-07-20 | 2015-12-02 | 朝阳聚声泰（信丰）科技有限公司 | Anti -interference speaker |
| CN108282585A (en) * | 2018-01-08 | 2018-07-13 | 维沃移动通信有限公司 | A kind of mobile terminal |
| CN110496768A (en) * | 2019-09-03 | 2019-11-26 | 厦门大学 | A kind of dual coil electromagnetic ultrasonic transducer for eliminating electromagnetic interference |
| CN213586258U (en) * | 2020-12-28 | 2021-06-29 | Oppo广东移动通信有限公司 | Circuit structure, electroacoustic component and audio equipment |
| CN113473333A (en) * | 2021-06-28 | 2021-10-01 | Oppo广东移动通信有限公司 | Electroacoustic device and electronic apparatus |
| CN215418508U (en) * | 2021-06-03 | 2022-01-04 | 万魔声学股份有限公司 | Novel battery with tab structure and TWS earphone |
| CN215581653U (en) * | 2021-06-25 | 2022-01-18 | 深圳前海帕拓逊网络技术有限公司 | Noise reduction earphone |
| CN215773499U (en) * | 2021-05-28 | 2022-02-08 | 深圳市豪恩声学股份有限公司 | Loudspeaker and earphone |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19942815C2 (en) * | 1999-09-08 | 2001-06-28 | Daimler Chrysler Ag | Device for controlling an airbag |
| FR2799919B1 (en) * | 1999-10-19 | 2002-10-11 | Sagem | PERMANENT MAGNET ACTUATOR AND DRIVE ELECTRICAL COIL, ESPECIALLY MOBILE PHONE SPEAKER |
| CN101677031A (en) * | 2008-09-19 | 2010-03-24 | 周有庆 | Straight wire PCB plane spiral coil primary current sensor |
| US10058016B2 (en) * | 2016-09-22 | 2018-08-21 | Apple Inc. | Compensation of magnetic interference |
| CN109975595B (en) * | 2019-04-08 | 2020-11-06 | 山东大学 | Leakage current sensor and device for resisting interference of power frequency magnetic field |
| CN213343218U (en) * | 2020-09-11 | 2021-06-01 | Oppo广东移动通信有限公司 | Circuit structure, battery and electronic equipment |
-
2022
- 2022-09-07 CN CN202211091617.XA patent/CN115226010B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002204494A (en) * | 2000-12-28 | 2002-07-19 | Toshio Senho | Speaker |
| JP2007129665A (en) * | 2005-11-07 | 2007-05-24 | Sony Corp | Speaker apparatus |
| WO2013018458A1 (en) * | 2011-07-29 | 2013-02-07 | 株式会社日立製作所 | Surface current probe |
| CN204031441U (en) * | 2014-08-07 | 2014-12-17 | 北京七九七华音电子有限责任公司 | Loud speaker |
| CN204836574U (en) * | 2015-07-20 | 2015-12-02 | 朝阳聚声泰（信丰）科技有限公司 | Anti -interference speaker |
| CN108282585A (en) * | 2018-01-08 | 2018-07-13 | 维沃移动通信有限公司 | A kind of mobile terminal |
| CN110496768A (en) * | 2019-09-03 | 2019-11-26 | 厦门大学 | A kind of dual coil electromagnetic ultrasonic transducer for eliminating electromagnetic interference |
| CN213586258U (en) * | 2020-12-28 | 2021-06-29 | Oppo广东移动通信有限公司 | Circuit structure, electroacoustic component and audio equipment |
| CN215773499U (en) * | 2021-05-28 | 2022-02-08 | 深圳市豪恩声学股份有限公司 | Loudspeaker and earphone |
| CN215418508U (en) * | 2021-06-03 | 2022-01-04 | 万魔声学股份有限公司 | Novel battery with tab structure and TWS earphone |
| CN215581653U (en) * | 2021-06-25 | 2022-01-18 | 深圳前海帕拓逊网络技术有限公司 | Noise reduction earphone |
| CN113473333A (en) * | 2021-06-28 | 2021-10-01 | Oppo广东移动通信有限公司 | Electroacoustic device and electronic apparatus |
Non-Patent Citations (2)
| Title |
|---|
| The Research and Design of Electronic Current Transformer Based on PCB Planar-Type of Air Core Coil;Yun fei Zhang;《2012 Asia-Pacific Power and Energy Engineering Conference》;20121231;第1-4页 * |
| 减少D类放大器中的电磁干扰;Bill;《中国电子商情(基础电子)》;20120708;第69-71页 * |
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