Patent Description:
With the development of electronic technologies, a terminal device such as a mobile phone has more and more functions, and a circuit structure and a layout of electronic devices on a circuit board in the terminal device are becoming increasingly complex, so that the electronic devices are more susceptible to electromagnetic interference. For example, when a radio frequency circuit on the circuit board is operating, a changing magnetic field will be generated around the radio frequency circuit, and the changing magnetic field may be easily coupled to surrounding electronic devices (such as an audio player with an audio coil), and consequently, normal operation of the electronic devices is affected.

The document <CIT> concerns a circuit structure, an electroacoustic component and audio equipment. The circuit structure is applied to the electroacoustic component and the audio equipment. The circuit structure comprises a circuit board, an inductance element and an electromagnetic induction piece. The inductance element is arranged on the circuit board, and the inductance element can generate a first induction magnetic field. The electromagnetic induction piece is arranged at a first position in the first induced magnetic field and is configured to generate a second induced magnetic field, and the second induced magnetic field can be overlapped with the first induced magnetic field. The second induced magnetic field provided by the embodiment of the utility model can be superposed with the first induced magnetic field, and the superposed induced magnetic field meets the requirements of peripheral devices and meets the requirements of different scenes.

The document <CIT> provides a circuit structure, a battery and electronic equipment. The circuit structure includes: a battery comprising a first positive electrode, a first negative electrode, and a cell coupled between the first positive electrode and the first negative electrode. The cell is capable of generating a first induced magnetic field in the presence of a varying current; and an electromagnetic inductor configured to generate a second induced magnetic field in the presence of a varying current. The second induction magnetic field can be superposed with the first induction magnetic field, and the superposed induction magnetic field meets the requirements of peripheral devices and the requirements of different scenes.

The document <CIT> discloses an anti-interference circuit board and a terminal, wherein the circuit board specifically comprises a substrate. The substrate is provided with a first surface, and a first area for placing a magnetometer is arranged on the first surface. The substrate is internally provided with a plurality of circuit layers which are arranged in a laminated manner, for example. The substrate is internally provided with at least a first functional circuit which is laminated and is used for generating a magnetic field generated in a first direction and a second functional circuit which is laminated and is used for generating a magnetic field generated in a second direction; when specifically setting up the position of first function circuit and second function circuit, satisfy: the first region is located within a perpendicular projection of the first functional circuit and the second functional circuit on the first surface. It can be seen from the above description that the interference suffered by the magnetometer in the first area is compensated by the arranged first functional circuit and the second functional circuit, and the first functional circuit and the second functional circuit are located below the magnetometer when the magnetometer is arranged, so that the surface area occupied by the anti-interference circuit board is reduced.

The document <CIT> concerns a compensation coil placed at least partially underneath a magnetic field sensor package in an electronic system provides attenuation of electromagnetic interference (EMI). In an embodiment, the compensation coil attenuates EMI in a frequency band which overlaps with an operating frequency band of the magnetic field sensor. This allows the magnetic field sensor to make accurate magnetic field measurements in the presence of system level alternating current (AC) EMI. In an embodiment, a system comprises: a magnetic field sensor; a compensation coil placed at least partially underneath the magnetic field sensor; and a reverse current generator coupled to the compensation coil and to a power supply that is coupled to an electromagnetic interference (EMI) source, the reverse current generator operable to generate a reverse current in the compensation coil to generate a counter magnetic field for compensating the EMI.

Embodiments of this application provide an anti-interference module and a terminal device, so as to resolve a problem that an electronic device in the terminal device in a related technology is susceptible to interference from a magnetic field of an interfering source on a circuit board.

To achieve the above objective, the embodiments of this application use the following technical solutions:
According to a first aspect, an embodiment of this application provides an anti-interference module, including a circuit board, an interfering source, a device disposing space, and an anti-interference component. The interfering source is disposed on the circuit board, where the interfering source may generate a changing interference magnetic field; the device disposing space is provided on a side of the circuit board and is used to dispose an electronic device with a first coil; and the anti-interference component is configured to generate a compensation magnetic field that overlaps the interference magnetic field, or to consume electric energy generated by coupling between the interference magnetic field and the anti-interference component to reduce magnetic induction intensity of the device disposing space. Moreover, the anti-interference module includes a second coil and a magnetic field shielding element. The second coil is disposed on a side of the device disposing space; and at least a part of the magnetic field shielding element is located between the second coil and the device disposing space.

By using the solution, the magnetic induction intensity of the device disposing space can be reduced, so as to reduce interference of the interference magnetic field generated by the interfering source to an electronic device, thereby ensuring normal operation of the electronic device. The anti-interference module is mainly aimed at the interfering source that generates the changing magnetic field, and reduces the interference of the changing magnetic field to the electronic device.

By using the solution, the second coil can reduce the magnetic induction intensity of the device disposing space by consuming energy generated by coupling between the second coil and the interference magnetic field, generating a compensation magnetic field by the second coil, or the like; and the magnetic field shielding element can shield a magnetic field generated by the second coil, so as to greatly reduce the interference of the changing magnetic field generated by the interfering source to the electronic device.

In some embodiments, the second coil is disposed between the interfering source and the device disposing space.

By using the solution, the magnetic field shielding element can shield not only a magnetic field generated by an induced current in the second coil, but also the interference magnetic field generated by the interfering source, so as to greatly reduce the interference of the interfering source to the electronic device.

In some embodiments, in a thickness direction of the circuit board, the device disposing space is provided on a side of the interfering source away from the circuit board.

By using the solution, the magnetic field shielding element and the second coil can be prevented from occupying an element layout space on the circuit board and on a periphery of the interfering source, thereby facilitating an optimal layout of a component on the circuit board.

In some embodiments, the second coil is a planar coil; and the magnetic field shielding element is layered and is disposed in lamination with the second coil.

By using the solution, sizes of the second coil and the magnetic field shielding element in the thickness direction of the circuit board can be reduced, so as to save space inside a mobile phone housing.

In some embodiments, the interference magnetic field is a low-frequency alternating magnetic field, and a material of the magnetic field shielding element is a permeability magnetic material. By using the solution, the magnetic field shielding element has a better shielding effect on the low-frequency alternating magnetic field, so that magnetic interference caused to the electronic device in the device disposing space can be better reduced.

In some embodiments, the permeability magnetic material is a nanocrystalline magnetic material. By using the solution, a magnetic shielding effect of the magnetic field shielding element can be improved.

In some embodiments, the anti-interference component further includes an energy consuming circuit electrically connected to the second coil, and the energy consuming circuit is configured to consume the electric energy generated by coupling between the second coil and the interference magnetic field.

By using the solution, the energy consuming circuit can quickly consume the electric energy generated by coupling between the second coil and the interference magnetic field generated by the interfering source, so as to consume magnetic field energy of the interference magnetic field, thereby reducing the interference of the interfering source to the electronic device.

In some embodiments, the energy consuming circuit is an RLC circuit.

By using the solution, a sudden change of a voltage and a current in the energy consuming circuit may be avoided, so that a resistance element in the RLC circuit can better consume the electric energy generated by coupling between the second coil and the interference magnetic field.

In some embodiments, the interference magnetic field is a high-frequency alternating magnetic field, and the energy consuming circuit includes a bead.

By using the solution, the bead may well convert the electric energy generated by coupling between the second coil and the interference magnetic field into thermal energy for consumption.

In some embodiments, the anti-interference component further includes a charging circuit electrically connected to the second coil, the charging circuit includes a charging connection end, and the charging connection end is configured to be electrically connected to a power supply. By using the solution, not only the electric energy generated by coupling between the second coil and the interference magnetic field is consumed, and the magnetic induction intensity of the device disposing space is reduced, but also a waste of electric energy on the second coil is avoided, thereby improving endurance of the power supply.

In some embodiments, the anti-interference component further includes a connection circuit electrically connected to the second coil, the connection circuit includes a power supply connection end, and the power supply connection end is configured to be electrically connected to an electrical device.

By using the solution, a waste of electric energy on the second coil is avoided, so as to reduce electric energy of a power supply of a terminal device consumed by an electrical device, thereby improving endurance of the power supply.

In some embodiments, the anti-interference module further includes a first alternating current power supply unit, the first alternating current power supply unit is electrically connected to the second coil, so that the second coil can generate the compensation magnetic field, and a direction in which the compensation magnetic field passes through the second coil is opposite to a direction in which the interference magnetic field passes through the second coil.

By using the solution, magnitude of a current input from the first alternating current supply unit to the second coil may be flexibly controlled based on a strength of the interference magnetic field, so as to control a strength of the compensation magnetic field, so that in the device disposing space, a magnetic flux of the compensation magnetic field can better offset a magnetic flux of the interference magnetic field, thereby reducing the interference of the interference magnetic field to the electronic device.

In some embodiments, the interfering source includes a load, a second alternating current power supply unit, and a connection line connected between the second alternating current power supply unit and the load; and a flow direction of a current in the second coil is opposite to a flow direction of a current in the connection line, where the flow direction includes a clockwise direction and a counterclockwise direction.

By using the solution, a phase of a current flowing into a current circuit can be consistent with a phase of a current flowing into the second coil, so that in the device disposing space, the magnetic flux of the compensation magnetic field can better offset the magnetic flux of the interference magnetic field.

In some embodiments, the anti-interference module further includes a phase modulation device connected between the first alternating current power supply unit and the second coil, and the phase modulation device is configured to adjust a phase of the current in the second coil, so that the phase of the current in the second coil is consistent with a phase of the current in the connection line.

By using the solution, the phase of the current in the second coil can be consistent with the phase of the current in the connection line, so that in the device disposing space, the magnetic flux of the compensation magnetic field can offset the magnetic flux of the interference magnetic field to a maximum extent.

In some embodiments, the phase modulation device includes an induction element.

By using the solution, a requirement of a current phase modulation is met. In addition, a configuration of the phase modulation device is simpler, thereby reducing costs of the anti-interference module.

In some embodiments, the first alternating current power supply unit and the second alternating current power supply unit are a same power supply unit.

By using the solution, the load and the second coil share a power supply unit, so that a quantity of devices on the circuit board can be reduced, thereby saving layout space on the circuit board.

In some embodiments, there are a plurality of loads, and each load is separately connected to the first alternating current power supply unit by using the connection line; the anti-interference module further includes a plurality of branch circuits, and a switching device disposed on each branch circuit; and first ends of the plurality of branch circuits are connected to a plurality of connection lines in a one-to-one correspondence, second ends of the plurality of branch circuits are electrically connected to one end of the second coil, and the other end of the second coil is electrically connected to the second alternating current power supply unit.

By using the solution, when the plurality of loads in the interfering source work simultaneously or sequentially, the interference of the interfering source to the electronic device can be reduced.

In some embodiments, the interfering source includes a load, a second alternating current power supply unit, and a connection line connected between the second alternating current power supply unit and the load; and the anti-interference component includes a compensation line, the compensation line is connected between the second alternating current power supply unit and the load, and a flow direction of a current in the compensation line is opposite to a flow direction of a current in the connection line, where the flow direction includes a clockwise direction and a counterclockwise direction.

By using the solution, in the device disposing space, a magnetic flux of a compensation magnetic field generated by the current in the compensation line can offset a magnetic flux of the interference magnetic field, so that magnetic induction intensity of the device disposing space can be reduced to reduce the interference that the interference magnetic field can cause to the electronic device.

In some embodiments, the anti-interference component further includes a variable resistor, and the variable resistor is disposed on the compensation line.

By using the solution, magnitude of the current in the compensation line may be adjusted by adjusting a resistance value of the variable resistor, so that in device disposing space, the magnetic flux of a compensation magnetic field generated by the current in the compensation line can offset the magnetic flux of the interference magnetic field to a maximum extent.

In some embodiments, a part of the compensation line is disposed close to the device disposing space.

By using the solution, a strength of the compensation magnetic field generated by the current in the compensation line in the device disposing space may be increased, so that the magnetic flux of a compensation magnetic field generated by the current in the compensation line in the component disposing space can better offset the magnetic flux of the interference magnetic field.

According to a second aspect, an embodiment of this application provides a terminal device, including a housing, an electronic device, and the anti-interference module according to the first aspect, where a circuit board of the anti-interference module is disposed in the housing; and the electronic device is disposed in the housing.

Beneficial effects of the terminal device in this embodiment of this application are the same as beneficial effects of the anti-interference module in the first aspect, and details are not described herein again.

In some embodiments, the electronic device is mounted in a device disposing space.

The solution is applicable to an unfoldable terminal device, and the electronic device and the anti-interference module are located in a same housing. In this way, a second coil and a magnetic field shielding element are closer to the electronic device, and therefore the second coil and the magnetic field shielding element can better avoid interference of an interfering source to the electronic device.

In some embodiments, the housing includes a first housing and a second housing connected to the first housing, and the first housing and the second housing may be switched between a folded state and an unfolded state, the circuit board is disposed in the first housing, the electronic device is disposed in the second housing, and when the first housing and the second housing are in the folded state, the electronic device is located in the device disposing space.

The solution is applicable to a foldable terminal device, and the second coil and the magnetic field shielding element can reduce interference of an interfering source to an electronic device located in another housing.

In embodiments of this application, the terms "first" and "second" are used for descriptive purposes only, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of technical features indicated. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of the features.

In embodiments of this application, it should be noted that the term "electrical connection" should be understood in a broad sense, for example, as a direct connection for current conduction or as a capacitive coupling for electric energy conduction.

A terminal device in embodiments of this application may be a terminal device with internal electromagnetic interference, such as a mobile phone, a tablet, an e-reader, a wearable device, a remote control, a POS (point of sales terminal, point of sales information management system) terminal, a notebook computer, a personal digital assistant (personal digital assistant, PDA), a vehicle-mounted device, or an Internet TV.

The terminal device in embodiments of this application is described below in detail by using the mobile phone as an example. Another type of the terminal device may be specifically configured with reference to a design concept of an anti-interference module in the mobile phone embodiments, and details are not described herein.

As shown in <FIG>, <FIG>, and <FIG>, <FIG> is an external view of an unfolded mobile phone according to some embodiments of this application, <FIG> is an inner view of an unfolded mobile phone in <FIG>, and <FIG> is a view of a folded mobile phone in <FIG>. The mobile phone is a foldable phone, including a housing <NUM>, a display <NUM>, and a camera <NUM>.

The housing <NUM> includes a first housing <NUM> and a second hosing <NUM> connected to the first housing <NUM>, and the first housing <NUM> and the second housing <NUM> may be switched between a folded state and an unfolded state.

The first housing <NUM> and the second housing <NUM> may be hinged, and a dashed line in the middle of <FIG> and <FIG> is an axis of a hinged shaft between the first housing <NUM> and the second housing <NUM>. However, this is not limited herein. The first housing <NUM> and the second housing <NUM> may alternatively be unfolded and folded by using another flexible component.

The display <NUM> includes an outer display <NUM> and a main display <NUM>. As shown in <FIG>, a first housing <NUM> is on the left side, the second housing <NUM> is on the right side, and the outer display <NUM> is disposed on the second housing <NUM> on the right side. As shown in <FIG>, the main display <NUM> is located on a side of the outer display <NUM> and is disposed on both the first housing <NUM> and the second housing <NUM>. A display area of the main display <NUM> is larger than a display area of the outer display <NUM>.

Both the outer display <NUM> and the main display <NUM> are flexible displays. For example, both the outer display <NUM> and the main display <NUM> are OLED (Organic Light-Emitting Diode, organic light emitting diode) flexible displays.

The camera <NUM> includes a front-facing camera <NUM> and a rear-facing camera <NUM>. The rear-facing camera <NUM> is mounted on the first housing <NUM>, and the front-facing camera <NUM> is mount on the second housing <NUM>. An avoidance hole is disposed on the outer display <NUM>, and the avoidance hole is used to avoid the front-facing camera <NUM>, so as to ensure normal photographing of the front-facing camera <NUM>.

When a user needs to use a display <NUM> with a relatively large display area, for example, for watching a film, as shown in <FIG>, the first housing <NUM> and the second housing <NUM> may be adjusted to the unfolded state. In this case, the main display <NUM> is unfolded, so that the user can obtain a better visual experience because the display area of the main display <NUM> is relatively large.

When the user goes out with the mobile phone, as shown in <FIG>, the first housing <NUM> and the second housing <NUM> may be adjusted to the folded state. In this case, the mobile phone occupies a relatively small space, so that the mobile phone can be conveniently carried. In addition, when the first housing <NUM> and the second housing <NUM> are adjusted to the folded state, the user may also operate the mobile phone by using the outer display <NUM>, so that normal use of the mobile phone is not affected.

As shown in <FIG> and <FIG>, <FIG> is a schematic diagram of a structure of a mobile phone in <FIG> with a main display <NUM> removed, and <FIG> is a schematic diagram of a structure of a mobile phone in <FIG> with an outer display <NUM> removed. The mobile phone further includes a power supply <NUM>, an electronic device <NUM>, and an anti-interference module <NUM>.

The anti-interference module <NUM> and the power supply <NUM> are disposed in a second housing <NUM>. The electronic device <NUM> is an audio player. The audio player is disposed in a first housing <NUM>, and located between the outer display <NUM> and the main display <NUM>. A first coil <NUM> (namely, an audio coil) and a diaphragm in contact with the first coil <NUM> (that is not shown in the figure) are disposed inside the audio player. When the audio player works, the first coil <NUM> drives the diaphragm to vibrate under action of an electromagnetic field, so that the electronic device <NUM> makes a sound.

As shown in <FIG>, <FIG> is a cross sectional view taken along A-A of an anti-interference module <NUM> in <FIG>, <FIG> is a diagram of a position relationship between an anti-interference module <NUM> and an electronic device <NUM> in <FIG>, and <FIG> is a schematic diagram of a structure of an interfering source <NUM> on a circuit board <NUM> according to some embodiments of this application. The anti-interference module <NUM> includes the circuit board <NUM>, the interfering source <NUM>, and a device disposing space <NUM>.

The device disposing space <NUM> is provided on a side of the circuit board <NUM> and is used to dispose the electronic device <NUM>. As shown in <FIG>, when the first housing <NUM> and the second housing <NUM> are in an unfolded state, the electronic device <NUM> is located outside the device disposing space <NUM>. As shown in <FIG>, when the first housing <NUM> and the second housing <NUM> are in a folded state, the electronic device <NUM> is located in the device disposing space <NUM>.

As shown in the <FIG> and <FIG>, the interfering source <NUM> is disposed on the circuit board <NUM>, and may generate a changing interference magnetic field. The interfering source <NUM> is a radio frequency circuit, including a load <NUM>, a second alternating current power supply unit <NUM>, and a connection line <NUM> connected between the load <NUM> and the second alternating current power supply unit <NUM>; and the second alternating current power supply unit <NUM> is electrically connected to the power supply <NUM> by using an electrical connector <NUM>. The second alternating current power supply unit <NUM> is a power management integrated circuit, the power supply <NUM> is a battery of the mobile phone, the load <NUM> is a radio frequency power amplifier, and the radio frequency power amplifier is configured to be electrically connected to an antenna of the mobile phone.

When the interfering source <NUM> works, the second alternating current power supply unit <NUM> supplies energy to the load <NUM> by using the connection line <NUM>, and the energy flows back to the second alternating current power supply unit <NUM> through a ground-plane path (as shown by a dashed line in <FIG>) to form a current circuit <NUM>. Generally, a current change of <NUM>-<NUM> A or even higher occurs on the current circuit <NUM>, a changing waveform is similar to a square wave, and a period is generally around <NUM> to <NUM>. Based on Faraday's law of electromagnetic induction, a changing current will generate a changing interference magnetic field. In this case, the interference magnetic field is a low-frequency alternating magnetic field. When the first housing <NUM> and the second housing <NUM> are in the folded state, the interference magnetic field can be coupled to the first coil <NUM> of the electronic device <NUM>, and an induced electromotive force will be generated in the first coil <NUM>, causing current noise audible to human ear. Consequently, the electronic device <NUM> cannot work properly.

To reduce interference of the interfering source <NUM> to the electronic device <NUM>, as shown in <FIG>, the anti-interference module <NUM> further includes an anti-interference component <NUM>, the anti-interference component <NUM> includes a second coil <NUM> and a magnetic field shielding element <NUM>, the second coil <NUM> is disposed on a side of the device disposing space <NUM>, and the magnetic field shielding element <NUM> is disposed between the second coil <NUM> and the device disposing space <NUM>. The anti-interference component <NUM> includes the second coil <NUM>, so that magnetic induction intensity of the device disposing space <NUM> can be reduced by consuming energy generated by coupling between the second coil <NUM> and the interference magnetic field, or by generating the interference magnetic field and a compensation magnetic field by the second coil <NUM>. In addition, the magnetic field shielding element <NUM> is further disposed between the second coil <NUM> and the device disposing space <NUM>, so that the magnetic field shielding element <NUM> can shield a magnetic field generated by the second coil <NUM> (the second coil <NUM> is coupled to the interference magnetic field to generate an induced current, and the induced current causes the second coil <NUM> to generate the magnetic field). Therefore, by disposing the second coil <NUM> and the magnetic field shielding element <NUM>, interference that of a changing magnetic field generated by the interfering source <NUM> to the electronic device <NUM> may be greatly reduced, thereby ensuring normal operation of the electronic device <NUM>.

Certainly, the interfering source <NUM> is also not limited to the radio frequency circuit, and may alternatively be another circuit or device that can generate the changing magnetic field, such as a circuit with an inductance coil. The foregoing load <NUM> is also not limited to the radio frequency power amplifier, and may be specifically determined based on a type of a circuit. The interference magnetic field generated by the interfering source <NUM> is also not limited to the low-frequency alternating magnetic field, and may alternatively be a high-frequency alternating magnetic field, or may be a changing magnetic field with a constant direction and changing magnitude.

In some embodiments, as shown in <FIG>, the second coil <NUM> is disposed between the interfering source <NUM> and the device disposing space <NUM>. In this way, the second coil <NUM> is closer to the interfering source <NUM>, and therefore magnetic induction intensity after the interference magnetic field passes through the second coil <NUM> may be better reduced, so as to reduce the interference of the interference magnetic field generated by the interfering source <NUM> to the electronic device <NUM>. In addition, the magnetic field shielding element <NUM> is located between the interfering source <NUM> and the device disposing space <NUM>. In this way, the magnetic field shielding element <NUM> can shield not only the magnetic field generated by the induced current in the second coil <NUM>, but also the interference magnetic field generated by the interfering source <NUM>. Therefore, the interference of the interfering source <NUM> to the electronic device <NUM> can be greatly reduced.

The second coil <NUM> may be located between the load <NUM> and the device disposing space <NUM>, or between a line connecting the load <NUM> and the second alternating current power supply unit <NUM> and the device disposing space <NUM>. This is not specifically limited herein.

In some embodiments, as shown in <FIG>, in a thickness direction H of the circuit board <NUM>, the device disposing space <NUM> is provided on a side of the interfering source <NUM> away from the circuit board <NUM>. In this case, the magnetic field shielding element <NUM> and the second coil <NUM> are located on the side of the interfering source <NUM> away from the circuit board <NUM>. In this way, the magnetic field shielding element <NUM> and the second coil <NUM> can be prevented from occupying an element layout space located on the circuit board <NUM> and on a periphery of the interference source <NUM>, thereby facilitating an optimal layout of an element on the circuit board <NUM>.

In some embodiments, as shown in <FIG>, the second coil <NUM> is a planar coil, and the magnetic field shielding element <NUM> is layered and is disposed in lamination with the second coil <NUM>. Based on such disposing, sizes of the magnetic field shielding element <NUM> and the second coil <NUM> in the thickness direction of the circuit board <NUM> can be reduced, so as to save space in the mobile phone housing <NUM>, thereby facilitating an optimal layout of a device in the mobile phone housing <NUM>.

Certainly, in addition to being located between the interfering source <NUM> and the device disposing space <NUM>, as shown in <FIG>, the second coil <NUM> may alternatively be located in an area enclosed by the current circuit <NUM> in the interfering source <NUM>; and in this case, it is necessary to ensure that the electronic device <NUM> on the circuit board <NUM> is orthographically projected into the area enclosed by current circuit <NUM>. The second coil <NUM> may alternatively be a solenoid coil in addition to the planar coil, and the magnetic field shielding element <NUM> may alternatively be another shape in addition to being layered. For example, the magnetic field shielding element <NUM> may be shaped like a cover to cover the interfering source <NUM> and the second coil <NUM>; and in this case, a part of the cover (to be specific, an upper wall of the cover) is located between the second coil <NUM> and the device disposing space <NUM>.

In some embodiments, the interference magnetic field generated by the interfering source <NUM> is the low-frequency alternating magnetic field, and a material of the magnetic field shielding element <NUM> is a permeability magnetic material. When a magnetic line of the low-frequency alternating magnetic field passes through the permeability magnetic material, the permeability magnetic material can confine the magnetic line inside the permeability magnetic material, to avoid that the magnetic field line passes through the magnetic field shielding element <NUM>, so that the magnetic field shielding element <NUM> has a better shielding effect on the low-frequency alternating magnetic field, thereby better reducing magnetic interference to the electronic device <NUM> in the device disposing space <NUM>.

A low-frequency alternating magnetic field shielded by the magnetic field shielding element <NUM> may be a magnetic field that is generated by an induced current generated by the coupling between the second coil <NUM> and the interference magnetic field, or may be the interference magnetic field generated by the interfering source <NUM>.

It should be noted that when the interference magnetic field generated by the interfering source <NUM> is the low-frequency alternating magnetic field, the induced current in the second coil <NUM> is a low-frequency alternating current, and in this case, the induced current in the second coil <NUM> also generates the low-frequency alternating magnetic field; or when the interference magnetic field generated by interfering source <NUM> is the high-frequency alternating magnetic field, the induced current in the second coil <NUM> is a high-frequency alternating current, and in this case, the induced current in the second coil <NUM> also generates the high-frequency alternating magnetic field.

In some embodiments, the permeability magnetic material is a nanocrystalline magnetic material. For example, the nanocrystalline magnetic material may be an iron-based nanocrystalline soft magnetic material, and the material is an amorphous magnetic material composed of five metal materials: iron, silicon, boron, copper, and niobium.

The nanocrystalline magnetic material has an excellent magnetic property because of a special structure characteristic of the nanocrystalline magnetic material, so that the nanocrystalline magnetic material can better prevent the magnetic line from passing through the magnetic field shielding element <NUM>, and therefore a magnetic shielding effect of the magnetic field shielding element <NUM> can be improved.

In addition to the nanocrystalline magnetic material, the permeability magnetic material may be ferrite, iron-silicon alloy (also referred to as a silicon steel sheet), or the like.

When the interference magnetic field generated by the interfering source <NUM> is the high-frequency alternating magnetic field, the material of the magnetic field shielding element <NUM> may alternatively be a metal material with good electrical conductivity, such as copper or aluminum. When the high-frequency alternating magnetic field passes through the magnetic field shielding element <NUM>, a very high eddy current can be caused on the magnetic field shielding element <NUM>. Because of a demagnetizing effect of the eddy current, the high-frequency alternating magnetic field cannot pass through the magnetic field shielding element <NUM>, and therefore the high-frequency alternating magnetic field has the shielding effect on the magnetic field shielding member <NUM>. The high-frequency alternating magnetic field shielded by the magnetic field shielding element <NUM> may be the magnetic field that is generated by an induced current generated by the coupling between the second coil <NUM> and the interference magnetic field, or may be the interference magnetic field generated by the interfering source <NUM>.

A manner in which the second coil <NUM> reduces the magnetic induction intensity of the device disposing space <NUM> is not unique. <FIG>, <FIG> show an embodiment of a first manner of reducing the magnetic induction intensity of the device disposing space <NUM>. <FIG> is a schematic diagram of a connection between a second coil <NUM> and an energy consuming circuit <NUM> according to some embodiments of this application; and <FIG> is a diagram of an equivalent circuit of an anti-interference module <NUM> in <FIG>. In this embodiment, the anti-interference component <NUM> further includes the energy consuming circuit <NUM> electrically connected to the second coil <NUM>, and the energy consuming circuit <NUM> is configured to consume the electric energy generated by coupling between the second coil <NUM> and the interference magnetic field. In this way, the energy consuming circuit <NUM> can quickly consume the electric energy generated by coupling between the second coil <NUM> and the interference magnetic field generated by the interfering source <NUM>, so as to consume magnetic field energy of the interference magnetic field, thereby reducing the interference of the interfering source <NUM> to the electronic device <NUM>.

The energy consuming circuit <NUM> is not unique. In some embodiments, as shown in <FIG>, the energy consuming circuit <NUM> is an RLC circuit. An inductance element L1 in the RLC circuit can be used for current stabilization, and a capacitance element C1 in the RLC circuit can be used for voltage stabilization. In this way, a sudden change of a voltage and a current in the energy consuming circuit <NUM> may be avoided, so that a resistance element R2 in the RLC circuit can better consume the electric energy generated by coupling between the second coil <NUM> and the interference magnetic field.

The RLC circuit may be an RLC series circuit, for example, the inductance element L1, the capacitance element C1, and the resistance element R2 in <FIG> are connected in series. However, this is not limited herein. The RLC circuit may alternatively be an RLC parallel circuit, provided that electric energy generated by the second coil <NUM> can be consumed. This is not specifically limited herein.

In some other embodiments, the energy consuming circuit <NUM> includes a bead. The bead has a very high resistivity and magnetic permeability, and is equivalent to a series connection of a resistor and an inductor, but both a resistance value and an inductance value of the bead change with frequency, and the bead is resistive at a high frequency. Therefore, when the interference magnetic field generated by the interfering source <NUM> is the high-frequency alternating magnetic field, the second coil <NUM> is coupled to the interference magnetic field to generate the high-frequency alternating current. In this case, a resistive bead can better convert the electric energy in the second coil <NUM> into thermal energy for consumption.

Certainly, in addition to composition shown in <FIG>, the energy consuming circuit <NUM> may alternatively be a pure resistance circuit.

Certainly, in addition to consuming the electric energy generated by coupling by using the energy consuming circuit <NUM>, resistance of the second coil <NUM> may alternatively be used to consume the electric energy generated by coupling between the interference magnetic field and the second coil <NUM>.

<FIG> show an embodiment of a second manner of reducing the magnetic induction intensity of the device disposing space <NUM>. <FIG> is a schematic diagram of a structure of an anti-interference module <NUM> according to some other embodiments of this application; and <FIG> is a diagram of an equivalent circuit of an anti-interference module <NUM> in <FIG>. In this embodiment, the anti-interference component <NUM> further includes a charging circuit <NUM> electrically connected to the second coil <NUM>, the charging circuit <NUM> includes a charging connection end <NUM>, and the charging connection end <NUM> is configured to be electrically connected to the power supply <NUM>.

By disposing the charging circuit <NUM>, the power supply <NUM> may be charged by using the induced current generated by the coupling between the second coil <NUM> and the interference magnetic field generated by the interfering source <NUM>. In this way, the electric energy generated by coupling between the second coil <NUM> and the interference magnetic field is consumed, so that the magnetic induction intensity of the device disposing space <NUM> is reduced; in addition, a waste of the electric energy in the second coil <NUM> is avoided, thereby improving endurance of the power supply <NUM>. As shown in <FIG>, the charging circuit <NUM> includes a first alternating current-direct current converter <NUM>, a charging line <NUM>, and a first control line <NUM>. The charging line <NUM> is connected between the second coil <NUM> and the charging connection end <NUM>. The first alternating current-direct current converter <NUM> is disposed on the charging line <NUM>, and is connected to a processor <NUM> on the circuit board <NUM> by using the first control line <NUM>. The processor <NUM> may control, by using the first alternating current-direct current converter <NUM>, the charging circuit <NUM> to charge the power supply <NUM>.

<FIG>, and <FIG> show an embodiment of a third manner of reducing the magnetic induction intensity of the device disposing space <NUM>. <FIG> is a schematic diagram of a structure of an anti-interference module <NUM> according to some other embodiments of this application; <FIG> is a diagram of an equivalent circuit of an anti-interference module <NUM> in <FIG>; and <FIG> is a schematic diagram of a connection between an anti-interference module <NUM> in <FIG> and an electrical device <NUM>. In this embodiment, the anti-interference component <NUM> further includes a connection circuit <NUM> electrically connected to the second coil <NUM>, the connection circuit <NUM> includes a power supply connection end <NUM>, and the power supply connection end <NUM> is configured to be electrically connected to the electrical device <NUM>.

By disposing the connection circuit <NUM>, the electrical device <NUM> may be charged by using the induced current generated by the coupling between the second coil <NUM> and the interference magnetic field generated by the interfering source <NUM>. In this way, the electric energy generated by coupling between the second coil <NUM> and the interference magnetic field is consumed, so that the magnetic induction intensity of the device disposing space <NUM> is reduced; in addition, a waste of the electric energy on the second coil <NUM> is avoided, so that electric energy of the power supply <NUM> of the mobile phone that is consumed by the electrical device <NUM> is reduced, thereby improving endurance of the power supply <NUM>.

As shown in <FIG>, the electrical device <NUM> may be a fill light disposed on a protective housing <NUM> of the mobile phone, and the fill light may fill light for photographing of the mobile phone. Certainly, in addition to the fill light, the electrical device <NUM> may be a decorative light disposed on the protective housing <NUM>, or the like.

As shown in <FIG>, the connection circuit <NUM> includes a second alternating current-direct current converter <NUM>, a power supply line <NUM>, and a second control line <NUM>. The power supply line <NUM> is connected between the second coil <NUM> and the power supply connection end <NUM>. The second alternating current-direct current converter <NUM> is disposed on the power supply line <NUM>, and is connected to the processor <NUM> by using a control line <NUM>. The processor <NUM> may control, by using the second alternating current-direct current converter <NUM>, the connection circuit <NUM> to supply power to the electrical device <NUM>.

The power supply connection end <NUM> may be electrically connected to a connector <NUM> (for example, pogo pin), or may be electrically connected to the electrical device <NUM> by using a conductor. This is not specifically limited herein.

<FIG> and <FIG> show an embodiment of a fourth manner of reducing the magnetic induction intensity of the device disposing space <NUM>. <FIG> is a schematic diagram of a structure of an anti-interference module <NUM> according to some other embodiments of this application, an arrow in <FIG> is a current flow direction at a moment; and <FIG> is a diagram of an equivalent circuit of an anti-interference module <NUM> in <FIG>. In this embodiment, the anti-interference module <NUM> further includes a first alternating current power supply unit <NUM>; the first alternating current power supply unit <NUM> is electrically connected to the second coil <NUM>, so that the second coil <NUM> can generate the compensation magnetic field; a direction in which the compensation magnetic field passes through the second coil <NUM> is opposite to a direction in which the interference magnetic field passes through the second coil <NUM>; and the first alternating current power supply unit <NUM> and the second alternating current power supply unit <NUM> are a same power supply unit.

Specifically, as shown in <FIG> and <FIG>, a flow direction of a current I1 in the second coil <NUM> is opposite to a flow direction of a current I2 in the connection line <NUM>. The flow direction includes a clockwise direction and a counterclockwise direction.

It can be learned from <FIG> that, at a moment, the flow direction of a current I2 in the connection line <NUM> of the interfering source <NUM> is clockwise, a direction of an interference magnetic field generated by the current I2 in the connection line <NUM> is perpendicular to a display inward; and the flow direction of a current I1 in the second coil <NUM> is counterclockwise, and a direction of a compensation magnetic field generated by the current in the second coil <NUM> is perpendicular to the display outward. In this way, the interference magnetic field and the compensation magnetic field are in opposite directions. Therefore, a magnetic flux of a compensation magnetic field in the device disposing space <NUM> can offset a magnetic flux of the interference magnetic field, thereby reducing the interference of the interference magnetic field to the electronic device <NUM>.

That the direction in which the compensation magnetic field passes through the second coil <NUM> is opposite to the direction in which the interference magnetic field passes through the second coil <NUM> means that at each moment, and the direction in which the compensation magnetic field passes through the second coil <NUM> is opposite to the direction in which the interference magnetic field passes through the second coil <NUM>.

The first alternating current power supply unit <NUM> is disposed to supply power to the second coil <NUM> to generate a reverse compensation magnetic field. In this way, magnitude of a current input from the first alternating current power supply unit <NUM> to the second coil <NUM> may be flexibly controlled based on a strength of the interference magnetic field, so as to control a strength of the compensation magnetic field. Therefore, in the device disposing space <NUM>, the magnetic flux of the compensation magnetic field can offset the magnetic flux of the interference magnetic field, so as to reduce the magnetic flux of the interference magnetic field, thereby reducing the interference of the interference magnetic field to the electronic device <NUM>.

In addition, the second alternating current power supply unit <NUM> and the first alternating current power supply unit <NUM> are the same power supply unit; that is, the load <NUM> and the second coil <NUM> share one power supply unit. In this way, a phase of the current I2 flowing into the connection line <NUM> can be consistent with a phase of the current I1 flowing into the second coil <NUM>. Therefore, in the device disposing space <NUM>, the magnetic flux of the compensation magnetic field can better offset the magnetic flux of the interference magnetic field, thereby reducing the interference of the interference magnetic field to the electronic device <NUM>. In addition, the second alternating current power supply unit <NUM> and the first alternating current power supply unit <NUM> are a same component, so as to reduce a quantity of devices on the circuit board <NUM>, thereby saving layout space on the circuit board <NUM>.

Certainly, in some other embodiments, the second alternating current power supply unit <NUM> and the first alternating current power supply unit <NUM> may alternatively be disposed separately. To be specific, the load <NUM> and the second coil <NUM> are separately powered by different power supply units. In some embodiments, as shown in <FIG> and <FIG>, the anti-interference module <NUM> further includes a phase modulation device <NUM> connected between the first alternating current power supply unit <NUM> and the second coil <NUM>, and the phase modulation device <NUM> is configured to adjust a phase of the current I1 in the second coil <NUM>, so that the phase of the current I1 in the second coil <NUM> is consistent with the phase of the current I2 in the connection line <NUM>.

The second coil <NUM> is equivalent to an inductor after being powered on, and can block, to some extent, the current that passes through the second coil <NUM>, so that the phase of the current I1 passing through the second coil <NUM> lags the phase of the current I2 in the connection line <NUM> in the interfering source <NUM>. In this way, when the current I2 in the connection line <NUM> in the interfering source <NUM> is on a wave crest, the current I1 in the second coil <NUM> does not reach the wave crest.

Consequently, in the device disposing space <NUM>, the magnetic flux of the compensation magnetic field cannot offset the magnetic flux of the interference magnetic field to a maximum extent. By disposing the phase modulation device <NUM>, the phase of the current I1 can be consistent with the phase of the current I2. In this way, when the current I2 in the connection line <NUM> is on the wave crest, the current I1 in the second coil <NUM> is also on the wave crest, so that in the device disposing space <NUM>, the magnetic flux of the compensation magnetic field can offset the magnetic flux of the interference magnetic field to the maximum extent, and further the interference of the interference magnetic field to the electronic device <NUM> is minimized.

In some embodiments, as shown in <FIG> and <FIG>, the phase modulation device <NUM> includes an inductance element L2. In this way, the current I1 that passes through the second coil <NUM> may be further lagged by the inductance element L2 of the phase modulation device <NUM>, so that the phase of the current I1 passing through the second coil <NUM> lags the phase of the current I2 in the connection line <NUM> in the interfering source <NUM> by <NUM> degrees, that is, the phase of the current I1 is consistent with a phase of the current I2. By disposing the inductance element L2, a requirement of a current phase modulation is met; in addition, a configuration of the phase modulation device <NUM> is simpler, thereby reducing costs of the anti-interference module.

In some embodiments, as shown in <FIG> and <FIG>, the phase modulation device <NUM> further includes a resistance element R3, and the resistance element R3 and the inductance element L2 are connected in series. In this way, the resistance element R3 can adjust the magnitude of the current flowing into the second coil <NUM>, so as to prevent an excessive current from flowing into the second coil <NUM>.

Certainly, if the phase of the current I1 in the second coil <NUM> and a phase of a current I2 in the current circuit <NUM> can be well controlled, the phase modulation device <NUM> may not be disposed.

In some embodiments, as shown in <FIG>, <FIG>, and <FIG>, <FIG> is a schematic diagram of a circuit board <NUM> according to some embodiments of this application; <FIG> is a schematic diagram of a structure of an anti-interference module <NUM> according to some other embodiments of this application; and <FIG> is a diagram of an equivalent circuit of an anti-interference module <NUM> in <FIG>. There are a plurality of loads <NUM> (two are shown in the figure), and each load <NUM> is separately connected to the first alternating current power supply unit <NUM> by using the connection line <NUM>.

The anti-interference module <NUM> further includes a plurality of branch circuits <NUM> (two are shown in the figure) and a switching device <NUM> disposed on each branch circuit <NUM>. First ends P1 of the plurality of branch circuits <NUM> are connected to a plurality of connection lines <NUM> in a one-to-one correspondence, second ends P2 of the plurality of branch circuits <NUM> are electrically connected to one end of a second coil <NUM>, and the other end of the second coil <NUM> is electrically connected to the second alternating current power supply unit <NUM>.

When a load 22a works, a switching device 84a causes a branch circuit 83a to be conducted, so that the direction of a compensation magnetic field generated by the second coil <NUM> is opposite to a direction of an interference magnetic field generated by the current circuit <NUM> in which the load 22a is located, so as to reduce the magnetic induction intensity of the device disposing space <NUM>. When a load 22b works, a switching device 84b causes a branch circuit 83b to be conducted, so that the direction of a compensation magnetic field generated by the second coil <NUM> is opposite to a direction of an interference magnetic field generated by the current circuit <NUM> in which the load 22b is located, so as to reduce the magnetic induction intensity of the device disposing space <NUM>.

The switching device <NUM> is disposed on each branch circuit <NUM>. In this way, the switching device <NUM> may open the branch circuit <NUM> corresponding to the load <NUM>, so that the direction of the compensation magnetic field generated by the second coil <NUM> is opposite to the direction of the interference magnetic field generated by the current circuit <NUM> corresponding to the load <NUM>, and interference to the electronic device <NUM> when the plurality of loads <NUM> separately work can be well reduced.

Based on the foregoing disposing, when the plurality of loads <NUM> in the interfering source <NUM> work simultaneously or sequentially, the interference of the interfering source <NUM> to the electronic device <NUM> can be reduced.

As shown in <FIG>, the foregoing switching device <NUM> may be a field effect transistor. A source and a drain of the field effect transistor are connected to the branch circuit <NUM>, a gate of the field effect transistor is connected to the processor <NUM>, and the processor <NUM> can control the field effect transistor to be turned on or turned off. Certainly, in addition to a field effect transistor, the switching device <NUM> may alternatively be a transistor.

In some embodiments, as shown in <FIG>, a phase modulation device <NUM> is disposed on each branch circuit <NUM>. This ensures that a phase of a current in each branch circuit <NUM> is consistent with a phase of a current in the current circuit <NUM> corresponding to the load <NUM>, so as to minimize the magnetic induction intensity in a device disposing space <NUM>.

As shown in <FIG> is a schematic diagram of a structure of an anti-interference module <NUM> according to some other embodiments of this application; and <FIG> is a diagram of an equivalent circuit of an anti-interference module <NUM> in <FIG>. A main difference between this anti-interference module <NUM> and the anti-interference module <NUM> in <FIG> lies in a different structure of the anti-interference component <NUM>.

The anti-interference component <NUM> includes a compensation line <NUM>. The compensation line <NUM> is connected between the second alternating current power supply unit <NUM> and the load <NUM>, and a flow direction of a current <NUM> in the compensation line <NUM> is opposite to the flow direction of a current I2 in the connection line <NUM>. As shown in <FIG>, the flow direction of a current <NUM> in the compensation line <NUM> is clockwise, and the flow direction of a current I2 in the connection line <NUM> is counterclockwise.

When the interfering source <NUM> works, the second alternating current power supply unit <NUM> supplies energy to the load <NUM> by using the connection line <NUM>, and the energy flows back to the second alternating current power supply unit <NUM> through a ground-plane path (as shown by a dashed line in <FIG>). In this way, an enclosed interference magnetic field is generated around a current I4 on the ground-plane path, and consequently, the interference magnetic field can cause specific interference to the electronic device <NUM> in the device disposing space <NUM>. The flow direction of a current <NUM> in the compensation line <NUM> is opposite to the flow direction of a current I2 in the connection line <NUM>. In this way, the flow direction of a current <NUM> in the compensation line <NUM> may be opposite to a flow direction of the current I4 on the ground-plane path, and in the device disposing space <NUM>, a magnetic flux of a compensation magnetic field generated by the current <NUM> can offset the magnetic flux of the interference magnetic field. Therefore, the magnetic induction intensity of the device disposing space <NUM> can be reduced, so as to reduce the interference of the interference magnetic field to the electronic device <NUM>.

In <FIG>, R5 is an impedance of the compensation line <NUM>, R6 is an impedance of the connection line <NUM>, R7 is an impedance of the load <NUM>, and R8 is an impedance of the ground-plane path.

In some embodiments, as shown in <FIG>, the anti-interference component <NUM> further includes a variable resistor R4, and the variable resistor R4 is disposed on the compensation line <NUM>. In this way, by adjusting a resistance value of the variable resistor R4, a value of the current I3 may be adjusted, so that in the device disposing space <NUM>, the magnetic flux of a compensation magnetic field generated by the current I3 can offset the magnetic flux of the interference magnetic field to the maximum extent, thereby reducing the interference that the interference magnetic field can cause to the electronic device <NUM>.

The resistance value of the variable resistor R4 may be adjusted manually or automatically. This is not specifically limited herein.

In some embodiments, as shown in <FIG>, a part of the compensation line <NUM> is disposed close to the device disposing space <NUM>. For example, a minimum distance d between an orthographic projection of the compensation line <NUM> on the circuit board <NUM> and an orthographic projection of the first coil <NUM> on the circuit board <NUM> is less than or equal to <NUM>.

Based on such disposing, strength of the compensation magnetic field generated by the current I3 in the device disposing space <NUM> may be increased, so that in the device disposing space <NUM>, the magnetic flux of a compensation magnetic field generated by the current I3 can better offset the magnetic flux of the interference magnetic field, thereby reducing the interference that the interference magnetic field can cause to the electronic device <NUM>.

It can be learned from the foregoing embodiments that the anti-interference component <NUM> generates a compensation magnetic field that overlaps the interference magnetic field, or consumes the electric energy generated by coupling between the interference magnetic field and the anti-interference component <NUM>, and therefore magnetic induction intensity of the device disposing space <NUM> can be reduced, so as to reduce the interference of the interference magnetic field to the electronic device <NUM>.

In some embodiments, as shown in <FIG> is a schematic diagram of a structure of an anti-interference module <NUM> according to some other embodiments of this application. An avoidance hole <NUM> for avoiding a camera is disposed on the circuit board <NUM>. In this way, the avoidance hole <NUM> can limit a position of the camera to some extent. This not only facilitates mounting and positioning of the camera, and prevents the camera from shaking greatly.

As shown in <FIG>, the avoidance hole <NUM> may be disposed in an area enclosed by the connection line <NUM> and the ground-plane path (as shown by a dashed line in the figure).

As shown in <FIG>, <FIG>, <FIG> is a front view of a mobile phone according to some other embodiments of this application; <FIG> is a schematic diagram of a structure of a mobile phone in <FIG> with a display <NUM> removed; and <FIG> is a cross sectional view taken along B-B of <FIG>. A main difference between the mobile phone in this embodiment and the mobile phone in <FIG> is that this mobile phone is a bar phone, and the electronic device <NUM> is mounted in a device disposing space <NUM>.

Specifically, the mobile phone includes a housing <NUM>, a display <NUM>, an anti-interference module <NUM>, an electronic device <NUM>, and a power supply <NUM>.

The display <NUM> is disposed on the housing <NUM>. A circuit board <NUM> of the anti-interference module <NUM> is disposed in the housing <NUM> and is electrically connected to the power supply <NUM>.

The electronic device <NUM> is an audio player. The electronic device <NUM> is disposed in the housing <NUM>, and is mounted in the device disposing space <NUM>. For example, as shown in <FIG>, in a thickness direction of the circuit board <NUM>, an interfering source <NUM>, a second coil <NUM>, a magnetic field shielding element <NUM>, and the electronic device <NUM> are sequentially disposed on the circuit board <NUM>. Based on the foregoing disposing, the electronic device <NUM> and the anti-interference module <NUM> are located in the housing <NUM>, and the electronic device <NUM> is closer to the second coil <NUM> and the magnetic field shielding element <NUM>. Therefore, the second coil <NUM> and the magnetic field shielding element <NUM> can better avoid interference of the interfering source <NUM> to the electronic device <NUM>.

For another structure of the anti-interference module <NUM>, refer to the structure setting in <FIG>.

Claim 1:
An anti-interference module (<NUM>), comprising:
a circuit board (<NUM>);
an interfering source (<NUM>), disposed on the circuit board (<NUM>), wherein the interfering source (<NUM>) may generate a changing interference magnetic field;
a device disposing space (<NUM>), disposed on a side of the circuit board (<NUM>) and used to dispose an electronic device (<NUM>) with a first coil (<NUM>); and
an anti-interference component (<NUM>), configured to generate a compensation magnetic field that overlaps the interference magnetic field, or to consume electric energy generated by coupling between the interference magnetic field and the anti-interference component (<NUM>) to reduce magnetic induction intensity of the device disposing space (<NUM>), wherein
the anti-interference component (<NUM>) comprises:
a second coil (<NUM>), disposed on a side of the device disposing space (<NUM>); and
a magnetic field shielding element (<NUM>), wherein at least a part of the magnetic field shielding element (<NUM>) is located between the second coil (<NUM>) and the device disposing space (<NUM>).