CN114552741A

CN114552741A - Charging coil assembly and wireless charging device

Info

Publication number: CN114552741A
Application number: CN202210191342.0A
Authority: CN
Inventors: 张桐恺; 雷奋星; 刘文成
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-05-27
Anticipated expiration: 2042-02-28
Also published as: WO2023160206A9; CN114552741B; CN116455102A; CN116455102B; WO2023160206A1

Abstract

The application relates to the wireless field of charging, provides a charging coil subassembly and wireless charging device, includes: the first charging coil and the second charging coil are partially overlapped, the first charging coil works, the second charging coil does not work, and a first induction current is excited in the second charging coil by the charging current in the first charging coil; meanwhile, a first interference current other than the first induced current due to interference is generated in the second charging coil; the first charging coil and the second charging coil are arranged in opposite directions, and the first induced current in the second charging coil and the first interference current in the second charging coil are opposite in direction due to the arrangement of the second charging coil and the first charging coil in opposite directions. The charging coil assembly can reduce interference signals in the secondary coil, so that the interference of the interference signals to a power supply is reduced.

Description

Charging coil assembly and wireless charging device

Technical Field

The application relates to the technical field of wireless charging, in particular to a charging coil assembly and a wireless charging device.

Background

Along with the development of wireless charging technology, people have higher and higher requirements on the degree of freedom of charging. Taking a mobile phone with a wireless charging function as an example, a user wants to place the mobile phone on a wireless charger at will to perform wireless charging, and the situation that the position of the mobile phone placed by the user deviates to some extent, which causes an overlarge deviation between the position of a charging coil of the wireless charger and the position of the charging coil in the mobile phone, is avoided, so that the charging is unsuccessful or the charging efficiency is low.

In general, in a wireless charging device, wireless charging at different positions can be achieved by providing a plurality of coils, thereby improving the degree of freedom of charging. When a user places the mobile phone on the wireless charger at will, the overlapping degree of one coil and the mobile phone is higher, and the mobile phone can use the coil as the main coil to charge.

However, when the handset is charged using this primary winding, other secondary windings may generate interference signals. These interference signals may cross-talk to the power supply through mutual inductance of the primary and secondary coils or interference paths such as ground reference, which affects the stability of the power supply and affects other devices using the power supply.

Disclosure of Invention

The application provides a charging coil subassembly and wireless charging device can reduce the interfering signal in the secondary coil to alleviate the interference to the power.

In a first aspect, a charging coil assembly is provided, comprising: the first charging coil and the second charging coil are partially overlapped, the first charging coil works, the second charging coil does not work, and a first induction current is excited in the second charging coil by the charging current in the first charging coil; meanwhile, a first interference current other than the first induced current due to interference is generated in the second charging coil; the first charging coil and the second charging coil are arranged in opposite directions, and the first induced current in the second charging coil and the first interference current in the second charging coil are opposite in direction due to the arrangement of the second charging coil and the first charging coil in opposite directions.

Due to the adoption of the arrangement mode of two charging coils which are arranged in a reverse direction, through the mutual inductance of the main coil to the secondary coil, the charging current in the main coil excites the induced current in a differential mode form with the phase opposite to the original interference current in the secondary coil (namely, the phase is 180 degrees different), so that the active control of the induced current in the differential mode form is realized, the total amount of the interference current in the secondary coil is reduced through reverse compensation of the interference current, and the interference of the secondary coil on equipment to be charged is reduced. In the CE test and the actual charging scenario, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric devices using the power supply are ensured.

In some possible implementations, the charging coil assembly is applied to a wireless charging device, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, the port settings of the first charging coil and the second charging coil are the same, and the first charging coil and the second charging coil are arranged in opposite directions, including: the first port of the first charging coil is connected with the first output node, the second port of the first charging coil is connected with the second output node, the first port of the second charging coil is connected with the second output node, and the second port of the second charging coil is connected with the first output node. The first port of the first charging coil is connected to the second output node, the second port of the first charging coil is connected to the first output node, and the first port of the second charging coil is connected to the first output node and the second port of the second charging coil is connected to the second output node.

The first port can be a port on the inner side of the charging coil, and the second port is a port on the outer side of the charging coil; or the first port is a port outside the charging coil, and the second port is a port inside the charging coil, which is not limited.

In some possible implementations, the first interference current includes: the second charging coil is in at least one of interference current generated in a resonance state under the action of a metal-oxide semiconductor (MOS) field effect transistor connected with two ends, interference current from the second charging coil is interfered through the printed circuit board, and interference current from the first charging coil to the second charging coil is transmitted through capacitive coupling between the first charging coil and the second charging coil.

In some possible implementations, the port settings of the first charging coil and the second charging coil are the same, the first charging coil and the second charging coil are arranged in opposite directions, including: the first charging coil is arranged in a turned manner, so that a first direction and a second direction are opposite, the first direction is a direction pointing to a second port of the first charging coil from a first port of the first charging coil along a winding direction of the first charging coil, and the second direction is a direction pointing to the second port of the second charging coil from the first port of the second charging coil along the winding direction of the second charging coil; wherein, the first direction is clockwise, the second direction is anticlockwise; alternatively, the first direction is counterclockwise and the second direction is clockwise.

In some possible implementations, the charging coil assembly further includes a third charging coil, the third charging coil partially overlaps with the first charging coil, the third charging coil does not operate, and the charging current in the first charging coil excites a second induced current in the third charging coil; meanwhile, a second interference current in addition to the second induced current due to interference is generated in the third charging coil; the third charging coil and the first charging coil are arranged in an opposite direction, and the opposite arrangement between the third charging coil and the first charging coil causes a second induced current in the third charging coil and a second interference current in the third charging coil to be in an opposite direction.

The charging coil subassembly that two charging coils are constituteed is compared to the charging coil subassembly that three charging coil is constituteed, and the degree of freedom that charges improves. Due to the fact that the arrangement of the charging coils with opposite directions is adopted, namely, each charging coil in the charging coils is provided with a charging coil arranged in the opposite direction. Therefore, when any one of the charging coils is used as the main coil, the charging current in the main coil excites an induced current of the auxiliary coil arranged in the opposite direction in the auxiliary coil through the mutual inductance of the main coil and the auxiliary coil, and the phase of the induced current is opposite to that of the interference current in the original auxiliary coil (namely, the phase is 180 degrees different), so that the interference current in the auxiliary coil can be reduced. The active control of the induced current in the differential mode is realized, the total amount of the interference current in the secondary coil is reduced by reversely compensating the interference current, the interference of the secondary coil on the device to be charged is reduced, and then in a CE test and an actual charging scene, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric equipment using the power supply are ensured.

In some possible implementations, the second interference current includes: the third charging coil is in the produced interference current of resonance state under the effect of the MOS field effect transistor that both ends are connected, through the interference current of printed circuit board crosstalk to the third charging coil to and the charging current on the first charging coil through with the third charging coil between the capacitive coupling transmit to the third charging coil in at least one of the interference current.

In some possible implementation manners, the wireless charging device is applied to, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, a port of a third charging coil and a port of a first charging coil are arranged the same, and the third charging coil and the first charging coil are arranged in opposite directions, including: the first port of the first charging coil is connected with the first output node, the second port of the first charging coil is connected with the second output node, the first port of the third charging coil is connected with the second output node, and the second port of the third charging coil is connected with the first output node.

In some possible implementations, the port settings of the third charging coil and the first charging coil are the same, and the third charging coil and the first charging coil are arranged in reverse, including: the first charging coil is arranged in a turned manner, so that a first direction and a third direction are opposite, the first direction is a direction pointing to the second port of the first charging coil from the first port of the first charging coil along the winding direction of the first charging coil, and the third direction is a direction pointing to the second port of the third charging coil from the first port of the third charging coil along the winding direction of the third charging coil; wherein, the first direction is clockwise, the third direction is anticlockwise; alternatively, the first direction is counterclockwise and the third direction is clockwise.

In some possible implementations, the charging coil assembly further includes a fourth charging coil, the fourth charging coil and the second charging coil partially overlap, the fourth charging coil does not overlap with the first charging coil and the third charging coil, and the fourth charging coil does not operate; the first interference current in the second charging coil excites a third induced current in a fourth charging coil; meanwhile, a third interference current other than the third induced current due to interference is generated in the fourth charging coil; the fourth charging coil and the second charging coil are arranged in an opposite direction, and the third induced current in the fourth charging coil and the third interference current in the fourth charging coil are opposite in direction due to the reverse arrangement between the fourth charging coil and the second charging coil.

In some possible implementations, the third interference current includes: the fourth charging coil is in the produced interference current of resonance state under the effect of the MOS field effect transistor that both ends are connected, through the interference current of printed circuit board crosstalk to the fourth charging coil to and the interference current on the second charging coil through with the fourth charging coil between the capacitive coupling transmit to the fourth charging coil in at least one of the interference current.

The charging coil subassembly that four charging coils are constituteed compares two and the charging coil subassembly that three charging coil is constituteed, and the degree of freedom that charges improves. Due to the fact that the arrangement of the charging coils with opposite directions is adopted, namely, each charging coil in the charging coils has the charging coil arranged in the opposite direction. Therefore, when any one of the charging coils is used as the main coil, the charging current in the main coil excites an induced current of the sub-coil arranged in the opposite direction to the charging current in the sub-coil by the mutual inductance of the main coil and the sub-coil. This induced current is in opposite phase (i.e. 180 degrees out of phase) to the interference current in the primary secondary winding, and thus some of the interference current can be cancelled. Simultaneously, the interference current in the second charging coil can also excite induced current in the fourth charging coil, and because the fourth charging coil and the second charging coil are arranged in a reverse direction, the induced current excited by the interference current in the second charging coil in the fourth charging coil is opposite to the interference current in the fourth charging coil, so that the interference current in the fourth charging coil can be reduced. Such an arrangement enables active control and back compensation of the induced current in the differential mode. Through reverse compensation interference current, the total amount of interference current in the secondary coil is reduced, the interference of the secondary coil on the device to be charged is reduced, and then in CE test and actual charging scenes, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric equipment using the power supply are ensured.

In some possible implementation manners, the wireless charging device is applied to, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, a port of a fourth charging coil and a port of a second charging coil are arranged the same, and the fourth charging coil and the second charging coil are arranged in opposite directions, including: the first port of the fourth charging coil is connected with the first output node, the second port of the fourth charging coil is connected with the second output node, the first port of the second charging coil is connected with the second output node, and the second port of the second charging coil is connected with the first output node.

In some possible implementation manners, the wireless charging device is applied to, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, a port of a fourth charging coil and a port of a second charging coil are arranged the same, and the fourth charging coil and the second charging coil are arranged in opposite directions, including: the fourth charging coil is arranged in a reversed mode, so that a fourth direction is opposite to the second direction, the fourth direction is a direction pointing to the second port of the fourth charging coil from the first port of the fourth charging coil along the winding direction of the fourth charging coil, and the second direction is a direction pointing to the second port of the second charging coil from the first port of the second charging coil along the winding direction of the second charging coil; wherein, the fourth direction is clockwise, the second direction is anticlockwise; alternatively, the fourth direction is counterclockwise and the second direction is clockwise.

In a second aspect, a charging coil assembly is provided, comprising: be applied to wireless charging device, wireless charging device includes full-bridge inverter circuit, and full-bridge inverter circuit includes first output node and second output node, and the charging coil subassembly includes: a first charging coil and a second charging coil; the first charging coil and the second charging coil are partially overlapped, and the port settings of the first charging coil and the second charging coil are the same; the first port of the first charging coil is connected with a first output node of the full-bridge inverter circuit, the second port of the first charging coil is connected with a second output node of the full-bridge inverter circuit, the first port of the second charging coil is connected with a second output node of the full-bridge inverter circuit, and the second port of the second charging coil is connected with the first output node of the full-bridge inverter circuit.

In order to clearly describe the orientation of the charging coil, a port of the charging coil may be defined, where the port of the first charging coil and the port of the second charging coil are arranged the same, and one end inside the charging coil is used as the first port and one end outside the charging coil is used as the second port.

Make two charging coils for the mode of reverse setting, can also be the orientation that keeps the charging coil unchangeable, change the connected mode between the port of charging coil and the output node of full-bridge inverter circuit. For example, the first port of the first charging coil is connected with the first output node instead of the first output node; meanwhile, the second port of the first charging coil is changed from being connected with the second output node to being connected with the first output node. And the connection mode of the port of the second charging coil and the output node of the full-bridge inverter circuit is not changed. That is, one output node of the full-bridge inverter circuit is connected to the first port of the first charging coil and the second port of the second charging coil, and the other output node of the full-bridge inverter circuit is connected to the second port of the first charging coil and the first port of the second charging coil. Such an arrangement may result in the two charging coils being in an inverted arrangement.

In the implementation mode, the two charging coils are arranged in an opposite phase mode by changing the connection mode between the ports of the charging coils and the output port of the full-bridge inverter circuit, and the primary coil can be used for mutually inducing the charging current in the primary coil into induced current in a differential mode form, wherein the induced current is excited in the secondary coil and has an opposite phase (namely, the phase is 180 degrees different) with the original interference current in the secondary coil, so that the active control of the induced current in the differential mode form is realized, the interference current is reversely compensated, the total amount of the interference current in the secondary coil is reduced, and the interference of the secondary coil on a device to be charged is reduced. In the CE test and the actual charging scenario, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and safety of other electric devices using the power supply are ensured.

In some possible implementations, the first charging coil is active, the second charging coil is inactive, and a charging current in the first charging coil induces a first induced current in the second charging coil; meanwhile, a first interference current other than the first induced current due to interference is generated in the second charging coil; wherein the first induced current in the second charging coil and the first interference current in the second charging coil are in opposite directions.

In some possible implementations, the charging coil assembly further includes a third charging coil, the third charging coil partially overlapping the first charging coil, the third charging coil not overlapping the second charging coil; the port setting of third charging coil and first charging coil is the same, and full-bridge inverter circuit's second output node is connected to the first port of third charging coil, and full-bridge inverter circuit's first output node is connected to the second port of third charging coil.

In this implementation, the second output node of full-bridge inverter circuit is connected through the first port of third charging coil, and the first output node of full-bridge inverter circuit is connected to the second port of third charging coil for the orientation of two arbitrary coincident charging coils is opposite, and two arbitrary coincident charging coils reverse settings promptly. Because the arrangement of the charging coils with opposite directions is adopted, namely each charging coil in the charging coils is provided with a charging coil arranged in the opposite direction, when any one charging coil is taken as the main coil, the charging current in the main coil excites the induced current of the auxiliary coil arranged in the opposite direction in the auxiliary coil through the mutual inductance of the main coil to the auxiliary coil, and the phase of the induced current is opposite to that of the interference current in the original auxiliary coil (namely the phase is 180 degrees different), so that the interference current can be counteracted, the active control of the induced current in the differential mode is realized, the total amount of the interference current in the auxiliary coil is reduced through the reverse compensation of the interference current, the interference of the auxiliary coil to the charging equipment is reduced, and the interference current flowing back to the power supply is correspondingly reduced in the CE test and the actual charging scene, so that the quality of the power supply can be improved, thereby ensuring the performance and safety of other electric equipment using the power supply.

In some possible implementations, the third charging coil is inactive, the charging current in the first charging coil induces a second induced current in the third charging coil; meanwhile, a second interference current in addition to the second induced current due to interference is generated in the third charging coil; wherein the second induced current and the second interference current have opposite directions.

In a third aspect, a charging coil assembly is provided, comprising: the charging device comprises a first charging coil and a second charging coil, wherein the first charging coil and the second charging coil are partially overlapped, and the ports of the first charging coil and the second charging coil are arranged in the same manner; the first charging coil is arranged in a reversed mode, so that a first direction and a second direction are opposite, the first direction is a direction from the first port of the first charging coil to the second port of the first charging coil along the winding direction of the first charging coil, and the second direction is a direction from the first port of the second charging coil to the second port of the second charging coil along the winding direction of the second charging coil; wherein, the first direction is clockwise, the second direction is anticlockwise; alternatively, the first direction is counterclockwise and the second direction is clockwise.

Through setting up first charging coil upset for first charging coil and second charging coil reverse setting, can be through the mutual inductance of main coil to the secondary coil, make the induced current of the difference mode form that the phase place of the charging current in the main coil was opposite (being phase place difference 180 degrees) originally had aroused in the secondary coil and the secondary coil, realized the active control to this difference mode form induced current, through reverse compensation interference current, make the total amount of interference current in the secondary coil reduce, the interference that the secondary coil was treated charging equipment reduces. In the CE test and the actual charging scenario, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric devices using the power supply are ensured.

In a fourth aspect, a charging coil assembly is provided, comprising: the charging device comprises a descrambling coil and a plurality of charging coils, wherein the descrambling coil and each charging coil in the plurality of charging coils are superposed, a first charging coil works, other charging coils except the first charging coil in the plurality of charging coils do not work, and the descrambling coil does not work, wherein the first charging coil is one of the plurality of charging coils; generating a first interference current caused by interference in the interference elimination coil, generating a second interference current caused by interference in the other charging coils, and generating an induced current in the other charging coils by the first interference current in the interference elimination coil; the interference elimination coil and the first charging coil are arranged in a reverse direction, and the reverse arrangement enables the directions of induced currents in other charging coils and the second interference current to be opposite.

When the quantity more than or equal to 3 of charging coil, carry out reverse setting through selecting the charging coil and have been difficult to guarantee that the charging coil is reverse setting between two liang, consequently can adopt to set up special interference signal that goes in the secondary coil of disturbing coil.

By arranging the interference elimination coil and reversely arranging the interference elimination coil and other charging coils, when any one charging coil is used as the main coil, the interference elimination coil can generate mutual inductance on the auxiliary coil, and induced current with the phase opposite to that of original interference current (namely, the phase difference is 180 degrees) is excited in the auxiliary coil. The induced current can counteract the interference current in the same secondary coil, and the active control of the induced current in the form of the differential mode is realized. Through reverse compensation interference current, the total amount of interference current in the secondary coil is reduced, the interference of the secondary coil on the device to be charged is reduced, and then in CE test and actual charging scenes, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric equipment using the power supply are ensured.

In some possible implementations, the charging coil assembly is applied to a wireless charging device, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, the first charging coil and a port of the interference elimination coil are arranged the same, the interference elimination coil and the first charging coil are arranged in reverse, including: the first port of the first charging coil is connected with the first output node, the second port of the first charging coil is connected with the second output node, the first port of the interference elimination coil is connected with the second output node, and the second port of the interference elimination coil is connected with the first output node.

In some possible implementations, the charging coil assembly is applied to a wireless charging device, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, the first charging coil and a port of the interference elimination coil are arranged the same, the interference elimination coil and the first charging coil are arranged in reverse, including: the de-interference coil is arranged in a turning mode, so that a first direction and a second direction are opposite, the first direction is a direction from the first port of the first charging coil to the second port of the first charging coil along the winding direction of the first charging coil, and the second direction is a direction from the first port of the de-interference coil to the second port of the de-interference coil along the winding direction of the de-interference coil; wherein, the first direction is clockwise, the second direction is anticlockwise; alternatively, the first direction is counterclockwise and the second direction is clockwise.

In some possible implementations, an area of a non-overlapping area between a coverage area of the descrambling coil and a charging area covered by the plurality of charging coils is less than a preset area difference threshold.

Through making the area that removes the non-overlapping region between the charging area that the coverage area of disturbing coil and all charging coils covered be less than predetermineeing the area difference threshold value, can avoid the coverage area of avoiding disturbing the coil and the charging area that all other charging coils covered jointly overlap the low mutual inductance that leads to of degree, the induced-current of production is too weak, and is crossed low to interference current's offset, influences the effect of removing the interference. Therefore, the interference elimination coil can generate strong induced current by enough mutual inductance at each charging coil, the offset of the interference current is large, and the interference elimination effect is further ensured. In the actual charging process, the interference of the charging coil assembly to the power supply can be reduced, and the performance and the safety of other electric equipment using the power supply are ensured.

In some possible implementations, the coverage area of the descrambling coil and the outer contour of the charging area covered by the plurality of charging coils coincide.

Therefore, mutual inductance between the interference elimination coil and the charging coil can be ensured to the maximum extent, and interference signals can be counteracted to the maximum extent; and the outer profile coincidence of the coverage area of disturbing removing coil and a plurality of charging coil, then the size of disturbing removing coil can not surpass the charging area that a plurality of charging coils covered, consequently need not to occupy the area outside the charging area of a plurality of charging coils, also need not just to increase wireless charging device's size on vain.

In some possible implementations, the number of charging coils is greater than or equal to 4.

In some possible implementations, the number of the plurality of charging coils is 18.

In a fifth aspect, a charging coil assembly is provided and applied to a wireless charging device, the wireless charging device includes a full-bridge inverter circuit, the full-bridge inverter circuit includes a first output node and a second output node, the charging coil assembly includes: a de-scrambling coil and a plurality of charging coils; the descrambling coil and each charging coil in the plurality of charging coils are superposed, and the port setting of each charging coil in the plurality of charging coils is the same as that of the descrambling coil; the first port of each charging coil in a plurality of charging coils all is connected with first output node, and the second port of each charging coil in a plurality of charging coils all is connected with second output node, goes to disturb the first port of coil and connects second output node, goes to disturb the second port of coil and connects first output node.

In the implementation mode, two charging coils are arranged in opposite phases by changing the connection mode between the port of the charging coil and the output port of the full-bridge inverter circuit, and induced current in a differential mode form of the phase difference (namely the phase difference is 180 degrees) between the excitation of the interference current in the interference removing coil and the original interference current in the secondary coil is achieved through the mutual inductance of the interference removing coil to the radiation coil, so that the interference current in the secondary coil is reduced, the active control of the induced current in the differential mode form is realized, the interference current is compensated reversely, the total amount of the interference current in the secondary coil is reduced, and the interference of the secondary coil on a device to be charged is reduced. In the CE test and the actual charging scenario, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric devices using the power supply are ensured.

In some possible implementations, the first charging coil is operated, other charging coils except the first charging coil in the plurality of charging coils are not operated, and the descrambling coil is not operated, wherein the first charging coil is one of the plurality of charging coils; generating a first interference current caused by interference in the interference elimination coil, and generating a second interference current caused by interference in the second charging coil, wherein the second charging coil is one of other charging coils; the first interference current in the descrambling coil generates an induced current in the second charging coil, wherein the induced current in the second charging coil and the second interference current are opposite in direction.

In a sixth aspect, a charging coil assembly is provided, comprising: the de-interference coil and the plurality of charging coils are overlapped, and the ports of each charging coil and each de-interference coil in the plurality of charging coils are arranged the same; the de-interference coil is turned over and arranged, so that a first direction and a second direction are opposite, the first direction is the direction of the second port of the first charging coil along the winding direction of the first charging coil, the first charging coil is one of the charging coils, and the second direction is the first port of the de-interference coil along.

Through the upset setting of interference elimination coil, make interference elimination coil and every charging coil set up in reverse, can be through interference elimination coil to the mutual inductance of radiation coil, make interference current in the interference elimination coil arouse in the secondary coil with the induced current of the phase opposition (being phase difference 180 degrees) of the original interference current in the secondary coil phase opposition, thereby subdue the interference current in the secondary coil, realized the active control to this induced current of differential mode form, through reverse compensation interference current, make the total amount of interference current in the secondary coil reduce, the interference that the secondary coil treats charging equipment reduces. In the CE test and the actual charging scenario, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, and the performance and the safety of other electric devices using the power supply are ensured.

In some possible implementations, the first charging coil is operated, other charging coils except the first charging coil in the plurality of charging coils do not operate, and the descrambling coil does not operate, wherein the first charging coil is one of the plurality of charging coils; generating a first interference current caused by interference in the interference elimination coil, and generating a second interference current caused by interference in the second charging coil, wherein the second charging coil is one of other charging coils; the first interference current in the descrambling coil generates an induced current in the second charging coil, wherein the induced current in the second charging coil and the second interference current are opposite in direction.

In a seventh aspect, there is provided a wireless charging device comprising N charging coil assemblies according to any one of claims 1 to 8, wherein N is a positive integer.

Can all carry out wireless charging to one in each charging coil subassembly and wait to charge equipment. When the wireless charging device comprises a plurality of charging coil assemblies in the above embodiments, a plurality of devices to be charged can also be charged wirelessly, wherein one charging coil is selected from each charging coil assembly as a main coil, and one device to be charged is charged wirelessly. The implementation principle and the beneficial effects of the charging coil assembly can be referred to the description of the charging coil assembly.

In some possible implementations, N is a positive integer greater than 1, and the wireless charging device is a wireless charging pad.

When a user places a plurality of electronic equipment such as cell-phones, smart watches that have wireless function of charging in the different regions of wireless charging panel, wireless charging panel has reduced the interference current that the secondary coil transmitted for the equipment of waiting to charge when can carrying out wireless charging to these a plurality of electronic equipment simultaneously. In the actual charging process, the interference of the wireless charging device to the power supply can be reduced, and the performance and the safety of other electric equipment using the power supply are ensured.

Drawings

Fig. 1 is a schematic structural diagram of a general wireless charging device including two charging coils according to an embodiment of the present application;

fig. 2 is a schematic diagram illustrating a relative position between a charging coil in a wireless charging stand and a charging coil in a mobile phone when the mobile phone provided in the embodiment of the present application is respectively placed vertically or horizontally;

fig. 3 is a schematic diagram illustrating an overlapping situation between two charging coils of a wireless charging device and a charging coil of a mobile phone when the two charging coils are at different positions according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an example of an LC resonance circuit equivalent to the secondary coil according to the embodiment of the present application;

fig. 5 is a schematic path diagram of a general wireless charging device according to an embodiment of the present disclosure, in which a secondary coil is used as an interference source to transmit an interference signal to a device to be charged;

fig. 6 is a schematic diagram illustrating directions of a charging current in the primary coil and an induced current excited in the secondary coil according to an embodiment of the present application;

fig. 7 is a schematic diagram illustrating a secondary coil as an interference path for transmitting an interference signal in a general wireless charging device according to an embodiment of the present application;

FIG. 8 is a schematic flow chart illustrating an exemplary interference signal in a test environment of a CE test according to an embodiment of the present application;

fig. 9 is a schematic view illustrating an orientation of two charging coils in a conventional charging device according to an embodiment of the present disclosure;

fig. 10 is a schematic view illustrating an orientation of two oppositely arranged charging coils according to an embodiment of the present application;

fig. 11 is a schematic view illustrating an orientation of two oppositely arranged charging coils according to an embodiment of the present application;

fig. 12 is a schematic diagram illustrating a comparison between the directions of the charging current of the main coil and the induced current excited in the sub-coil, which are arranged in the same direction and in the opposite direction according to the embodiment of the present application;

FIG. 13 is a sampling diagram of an exemplary interference signal in a CE test environment according to an embodiment of the present disclosure;

fig. 14 is a waveform diagram of an induced current excited in the secondary coil according to an example of the present disclosure;

figure 15 is a pictorial view of an example of a universal charging coil assembly having three charging coils, as provided by the embodiments of the present application;

fig. 16 is a schematic diagram illustrating an example of a direction of an induced current in a charging coil assembly including three charging coils according to an embodiment of the present application;

fig. 17 is a schematic diagram of a direction of an induced current in another example of a charging coil assembly including three charging coils according to an embodiment of the present application;

fig. 18 is a schematic diagram illustrating an example of a direction of an induced current in a charging coil assembly including four charging coils according to an embodiment of the present application;

fig. 19 is a schematic structural diagram of an example of a charging coil assembly including three charging coils and one descrambling coil according to the embodiment of the present application;

fig. 20 is a schematic structural diagram of a charging coil assembly including three charging coils and one descrambling coil according to another example provided by the embodiment of the present application;

fig. 21 is a schematic structural diagram of an example of a charging coil assembly including four charging coils and one descrambling coil according to the embodiment of the present application;

fig. 22 is a schematic structural diagram of an example of a charging coil assembly including 18 charging coils and a descrambling coil according to the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

In the following, the terms "first", "second", "third" and "fourth" 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, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features.

The coil assembly provided by the embodiment of the present application may be used in a wireless charging device, such as a wireless charger of a mobile phone or a wireless charging pad, and the embodiment of the present application does not set any limitation to a specific type of the wireless charging device.

Generally, a wireless charging device mainly adopts the principle of electromagnetic induction, and energy is coupled through a coil to realize energy transfer. In order to improve the degree of freedom of charging, a plurality of charging coils at different positions are usually disposed in the wireless charging device to charge devices to be charged at different positions. Taking a mobile phone with a wireless charging function as an example, a user wants to place the mobile phone on a wireless charger at will to perform wireless charging, and the position of a charging coil used for transmitting by the wireless charger and the position of the charging coil used for receiving in the mobile phone are not deviated due to the deviation of the position of the user on the mobile phone, so that the charging is unsuccessful or the charging efficiency is low. If set up the charging coil of a plurality of different positions in wireless charging device, when the user placed the cell-phone on wireless charger at will, the degree of overlap that always has a charging coil in charging coil and the cell-phone is than higher, and the cell-phone then can charge as the main coil with this charging coil.

Taking a wireless charging seat for wirelessly charging a mobile phone as an example, fig. 1 is an appearance structure schematic diagram of the wireless charging seat, the wireless charging seat includes a base 101 and a back plate 102, and an upper coil 103 and a lower coil 104 are disposed in the back plate 102. When the user vertically places the mobile phone 202 on the wireless charging cradle as shown in a of fig. 2, as can be seen from the side view of the wireless charging cradle shown in b of fig. 2, the charging coil 2021 of the mobile phone 202 and the upper coil 103 of the wireless charging cradle located above overlap to a relatively high degree, and at this time, the upper coil 103 can be selected to wirelessly charge the mobile phone 202. When the user places the mobile phone 202 on the wireless charging stand in the horizontal direction as shown in the diagram c in fig. 2, as can be seen from the side view of the wireless charging stand shown in the diagram d in fig. 2, the charging coil 2021 of the mobile phone 202 and the lower coil 104 of the wireless charging stand located below overlap to a relatively high degree, and at this time, the lower coil 104 can be selected to wirelessly charge the mobile phone. Therefore, when the wireless charging stand is used for charging, the mobile phone can be charged efficiently whether the mobile phone is horizontally placed or vertically placed.

Generally, when a plurality of charging coils are included in a wireless charging device, there is a certain degree of overlap between areas covered by the plurality of charging coils. Taking the example of the presence of two charging coils in the wireless charging device shown in fig. 3 as an example, if the two charging coils do not overlap as shown in a diagram a in fig. 3, when the mobile phone 201 is placed in the area between the two charging coils, the degree of overlap between the charging coil 2021 as a receiving coil inside the mobile phone 201 and any charging coil in the wireless charging device is very low, which may affect the charging efficiency or even cause no charging. Therefore, in a wireless charging device, two charging coils may be partially overlapped with each other as shown in a diagram b in fig. 3. When the mobile phone 201 moves from the position corresponding to one charging coil in the wireless charging device to the direction of another charging coil, there is always a charging coil 2021 inside the charging coil and the mobile phone 201 with higher overlapping degree, so the wireless charging device can both select a charging coil to efficiently charge the mobile phone, and there is no blind area for charging. That is, even when the mobile phone 201 is in the position shown in b of fig. 3, the wireless charging device can select one of the charging coils to efficiently charge the mobile phone, and thus the degree of freedom of charging can be improved by disposing the charging coils so as to overlap each other.

When waiting to charge equipment and placing on wireless charging device, wait that charge equipment can send the signal of request charge to wireless charging device to it is high to detect which charging coil in the wireless charging device and the degree of overlap of the charging coil in waiting to charge equipment. Then, the wireless charging device can use the charging coil with high overlapping degree of the charging coil in the wireless charging device and the device to be charged as the main coil to perform wireless charging. In some embodiments, after the main coil is selected, the wireless charging device may further perform a handshake process with the device to be charged to ensure smooth subsequent charging, and the wireless charging device performs charging after the handshake process passes.

When the main coil in the wireless charging device is used for wirelessly charging the device to be charged, other charging coils in the wireless charging device are used as secondary coils, and the secondary coils cannot charge the device to be charged. In this case, an interference signal is present in the secondary coil. Here we refer to all useful signals that cannot be used as charging signals as interference signals. The interference signals can crosstalk to the power supply through interference paths such as mutual inductance of the main coil and the secondary coil or reference ground, the stability of the power supply is influenced, and other devices using the power supply are influenced.

First, an overview of a charging circuit in a wireless charging apparatus is provided. Taking the two charging coils of the upper coil and the lower coil existing in the wireless charging device as an example, referring to a diagram in fig. 4, the charging circuit includes a full-bridge inverter circuit, the full-bridge inverter circuit is used for connecting the power supply and the charging coils, wherein the full-bridge inverter circuit includes a first output node a and a second output node B. Two ports of the charging coil are respectively connected with the first output node A and the second output node B so as to obtain electric energy, and charging is carried out on the charging equipment.

However, when the main coil is operated, that is, when the main coil is charged, an interference signal is generated in the sub-coil which is not operated. The source of the interference signal generated in the secondary coil in the wireless charging device will be described by taking the charging circuit shown in a diagram in fig. 4 as an example:

1. when the wireless charging device selects the main coil to be charged, if the sub-coil is connected to a metal-oxide semiconductor (MOS) field effect transistor through two ends, a body diode in the MOS transistor places the sub-coil in a floating state, for example, as shown in a diagram a in fig. 5. The secondary coil in the floating state may be equivalent to an LC resonant circuit including an equivalent capacitance and an equivalent inductance, for example, as shown in diagram b in fig. 5. This LC resonant circuit generates a resonant signal, causing interference.

2. Other interference signals are also transferred to the secondary coil via capacitive coupling on a Printed Circuit Board (PCB). Taking the diagram a in fig. 4 as an example, the interference signal is coupled from the PCB where the full-bridge inverter circuit is disposed to the upper coil as the secondary coil through the equivalent capacitor C1 as shown in the diagram a in fig. 4.

3. The interference signal is transmitted from the primary coil to the secondary coil through capacitive coupling between the charging coils. For example, taking two charging coils, i.e. an upper coil and a lower coil, included in the wireless charging device as an example, the equivalent capacitance between the upper coil and the lower coil can be referred to as C2 in a diagram of fig. 4. The diagram b in fig. 4 is a side view of the upper and lower coils, and C2 is the equivalent capacitance.

4. The interference signal is transmitted to the secondary coil through mutual inductance between the charging coils. Although the direction of the charging current is changed with time as the charging current is an alternating current, the direction of the charging current is fixed at a fixed time. For example, as shown in fig. 6, when the direction of the charging current in the lower coil as the main coil is clockwise, the charging current generates an induced electromotive force in the upper coil as the sub-coil, thereby exciting an induced current, which is also clockwise. If there is interference current in the original upper coil, and the direction of the interference current is clockwise, the interference current will be superimposed on the original interference current, and the interference will be aggravated. For the sake of clarity, the current direction on the charging coil is shown as 1 in fig. 6, and actually, the number of turns of the charging coil may be multiple, and the current direction of the same type on each turn of the coil is the same at the same time.

Taking two charging coils, namely an upper coil and a lower coil, as an example, in the wireless charging device, when the lower coil is used as the main coil for charging, since the full-bridge inverter circuit is disposed on the PCB, the interference signal in the form of a differential mode can be coupled to the upper coil as the sub-coil through the equivalent capacitor C1 along the path 1 as shown in a diagram a in fig. 4, and flows back to the equivalent ground. In the process, the secondary coil converts the high-frequency component of the interference signal into the interference signal in a common mode form, and transmits the interference signal to the device to be charged. In addition, the secondary winding can provide a path 2 shown in fig. 7 for the interference signal in the form of a differential mode brought by the primary winding, and the path 2 can be used as a common mode path to convert the high-frequency component of the interference signal into the interference signal in the form of a common mode and transmit the interference signal to the device to be charged. It should be noted that the interference signal is transmitted from the upper coil as the sub-coil to the device to be charged through the capacitive coupling (equivalent capacitance C3) between the upper coil and the lower coil.

For the above reasons, the secondary coil may transmit the interference signal to the device to be charged. During the actual charging process, the interference signal coupled to the device to be charged may be coupled to the power source through various coupling paths, thereby affecting other electric devices using the power source. In order to ensure normal use of other electric devices under the same power supply, a conducted disturbance (CE) test needs to be performed on the wireless charging device. The CE test is a test item required to be tested and specified by a regulation, and is used for testing whether the interference degree of the wireless charging device to the power supply meets the requirement in the wireless charging process. In the CE test process, a test environment is a charging scenario simulating daily use of a user, and here, taking the test environment of the CE test as an example, an interference path of an interference signal transmitted to a device to be charged is described. As shown in fig. 8, the test environment includes a test bench and a line-impedance stabilization network (LISN). Wherein, arrange the wireless charging device that awaits measuring on the testboard, wait that the battery charging outfit places and carries out wireless charging on wireless charging device's base. The LISN is used as a power supply for supplying power to the test environment and is connected with the power socket through a power line. The power cord of the wireless charging device is connected to a power socket to get electricity. Meanwhile, a detector circuit is integrated inside the LISN, and is used for detecting the interference signal and outputting the detection result to the spectrometer, and the magnitude of the interference signal is observed through the spectrometer. The magnitude of the interference signal is described as an interference voltage, that is, if the interference voltage detected by the detector is large, the interference of the wireless charging device on the power supply is large, and if the interference voltage detected by the detector is small, the interference of the wireless charging device on the power supply is small.

When the interference signal is coupled from the secondary coil of the wireless charging apparatus to the device to be charged through the capacitive coupling between the secondary coil of the wireless charging apparatus and the device to be charged, there is a backflow condition of the interference signal. As shown in fig. 8, there is also capacitive coupling between the device to be charged and the reference ground, which can be equivalent to an equivalent capacitor C4. When the device to be charged is plugged into the earphone, the earphone line and the reference ground have a large capacitive coupling, which can be equivalent to an equivalent capacitor C5. At this time, the interference signal originally on the device to be charged may form an interference loop as a path shown by a dotted line in fig. 8, and on this interference loop, the arrow direction indicates the flow direction of the interference signal. In the test scenario shown in fig. 8, the LISN may be equivalent to a power supply of a home in an actual application scenario, and if the detector detects a larger voltage, it indicates that the power supply of the home carries a larger interference signal. Once another electric device is connected to the power supply of the home, the interference signal is brought into the power supply of the other electric device, which affects the performance or safety of the other electric device.

In the scheme that this application provided, through the orientation of adjustment part charging coil for the induced current opposite with original interference current's direction is in other charging coils to the charging coil after the adjustment orientation, offsets interference current from this, thereby has realized the active control to interference current. Because the interference current on the secondary coil in the wireless charging device is reduced fundamentally, the interference current coupled to the equipment to be charged can be weakened, the interference on a power supply is reduced, and the performance and the safety of other electric equipment are ensured.

First, a wireless charging device having two charging coils is taken as an example, and the technical solution and the implementation principle of the present application are explained in detail.

The two charging coils in fig. 9 do not overlap and do not represent that the two charging coils do not overlap, but for the purpose of clearly showing the schematic of the orientation of the two coils, the two charging coils may be partially overlapped, for example, as shown in fig. 1. In fig. 9, the first charging coil and the second charging coil are arranged in the same direction, i.e. the orientation of the charging coils is the same. In order to clearly describe the orientation of the charging coil, a port of the charging coil may be defined, where the port of the first charging coil and the port of the second charging coil are arranged the same, and one end inside the charging coil is used as the first port and one end outside the charging coil is used as the second port.

Two charging coils arranged in the same direction can generate large interference current, so that the power supply is interfered. In the embodiment of the application, one of the charging coils can be turned over, so that the two charging coils are arranged in opposite directions to reduce interference. For example, the second charging coil is turned over, and the second charging coil is turned over without changing the port connection mode. For example, as shown in fig. 10, the flipped second charging coil and the flipped first charging coil are two charging coils arranged in opposite directions. After the second charging coil is arranged in an overturning manner, the direction pointing to the second port of the second charging coil along the winding direction of the second charging coil from the first port of the second charging coil is in an anticlockwise direction; the direction pointing to the second port of the first charging coil is clockwise along the winding direction of the first charging coil from the first port of the first charging coil. Namely, after the second charging coil is turned over, the first ports of the two charging coils point to the opposite direction of the second port along the respective winding direction.

When the first charging coil operates as the primary coil, the second charging coil does not operate as the secondary coil. The charging current in the first charging coil excites an induced current in the second coil, and at the same time, an interference current other than the induced current due to interference is generated in the second charging coil. Due to the fact that the second charging coil is arranged in a reversed mode, the direction of the induced current can be changed, and the direction of the induced current is opposite to that of the interference current (including the interference current caused by the source 1, the source 2 and the source 3), so that part of the interference current is offset, and interference is reduced.

When the second charging coil operates as the primary coil, the first charging coil does not operate as the secondary coil. The charging current in the second charging coil excites an induced current in the first coil, and simultaneously, other interference currents than the induced current due to interference are generated in the second charging coil. Due to the fact that the second charging coil is arranged in a turnover mode, the direction of the induced current can be changed accordingly, the induced current and the interference current are opposite in direction, and therefore a part of interference current is offset, and interference is reduced.

Optionally, on the basis of fig. 9, in the technical solution of the present application, the first charging coil may also be turned over, so that the turned first charging coil and the second charging coil that is not turned over are two charging coils that are arranged in opposite directions. After the first charging coil is arranged in an overturning manner, the direction pointing to the second port of the first charging coil along the winding direction of the first charging coil from the first port of the first charging coil is in an anticlockwise direction; the direction pointing to the second port of the second charging coil by the first port of the second charging coil along the winding direction of the second charging coil is clockwise. After the first charging coil is arranged in an overturning manner, the directions of the first ports of the two charging coils pointing to the second port along the respective winding directions are opposite. When the first charging coil works as the main coil or the second charging coil works as the main coil, the induced current excited by the main coil in the secondary coil is opposite to other interference currents except the initial induced current in the secondary coil in direction, so that part of interference currents are offset, and the interference is reduced.

In some embodiments, the two charging coils are arranged in opposite directions, and the connection mode between the port of the charging coil and the output node of the full-bridge inverter circuit may also be changed while the orientation of the charging coil is kept unchanged. For example, referring to fig. 11, the first port of the first charging coil is changed from being connected to the first output node a to being connected to the second output node B; meanwhile, the second port of the first charging coil is changed from being connected with the second output node B to being connected with the first output node A. And the connection mode of the port of the second charging coil and the output node of the full-bridge inverter circuit is not changed. That is, one output node of the full-bridge inverter circuit is connected to the first port of the first charging coil and the second port of the second charging coil, and the other output node of the full-bridge inverter circuit is connected to the second port of the first charging coil and the first port of the second charging coil. Such an arrangement may result in the two charging coils being in an inverted arrangement.

At a certain time, when a direction of a charging current flows from the first output node a to the second output node B, if the first charging coil operates as the main coil, the direction of the charging current in the first charging coil is counterclockwise, the charging current generates a counterclockwise induced current in the inactive sub-coil (second charging coil), and a direction of an interference current in the second charging coil as the sub-coil other than the induced current is clockwise from the first output node a toward the second output node B in a winding direction of the second charging coil. At this time, the directions of the induced current and the interference current are opposite, and the induced current can cancel part of the interference current, thereby reducing the interference. If the second charging coil operates as the main coil, the direction of the charging current in the second charging coil is clockwise, the charging current generates a clockwise induced current in the non-operating sub-coil (first charging coil), and the direction of the interference current in the second charging coil as the sub-coil, excluding the induced current, is counterclockwise from the first output node a toward the second output node B along the winding direction of the first charging coil. At this time, the directions of the induced current and the interference current are opposite, and the induced current can cancel part of the interference current, thereby reducing the interference.

Similarly, if the direction of the charging current flows from the second output node B to the first output node a, no matter whether the first charging coil operates as the main coil or the second charging coil operates as the main coil, the charging current in the main coil generates an induced current in the secondary coil in the same direction as the charging current (in the same clockwise direction or in the same counterclockwise direction), and the induced current is opposite to the direction of the interference current except for the induced current originally existing in the secondary coil.

Next, the directions of the induced current and the interference current are explained with reference to a charging coil current direction diagram in fig. 12. Fig. 12 illustrates an example in which the first charging coil is a lower coil and the second charging coil is an upper coil. At a fixed moment, as in a diagram of fig. 12, the lower coil is charged as the main coil that is charged, and at this time, there is a charging current in the main coil, and the charging current is in a clockwise direction. At the same time, the charging current in the main coil excites a magnetic field in the upper coil as a sub-coil inward toward the paper, thereby inducing a clockwise induced current. There are also common mode interference signals brought by other paths in the original secondary coil, and the interference current is clockwise. When the sense current and the interference current are in the same direction, the interference is increased. In the technical scheme of this application, with first charging coil 1201 and second charging coil 1202 reverse setting. The first charging coil 1201 may be turned 180 degrees, or the second charging coil 1202 may be turned 180 degrees. For example, see diagram b in fig. 12, which illustrates turning over the first charging coil 1201 in diagram b in fig. 12. After the first charging coil 1201 is turned over by 180 degrees, the first charging coil 1201 and the second charging coil 1202 are arranged in a reverse direction, the charging current in the original clockwise direction is changed into the counterclockwise direction, the charging current in the main coil excites a magnetic field which is perpendicular to the paper surface and faces outwards in the upper coil serving as the auxiliary coil, and meanwhile, the direction of the induced current excited by the charging current in the upper coil is changed from the clockwise direction to the counterclockwise direction. Therefore, not only is the interference not intensified, but also the interference current in the original upper coil is offset, the effect of inhibiting the interference current is achieved, the total amount of the interference current is reduced, and the interference of the secondary coil on the equipment to be charged is reduced. In fact, the first charging coil can also be an upper coil, and the second charging coil is a lower coil, and this embodiment of the application does not limit which charging coil the first charging coil is.

When the wireless charging device with the charging coil assembly shown in the b diagram in fig. 12 is used for wireless charging, because the arrangement of the charging coils with opposite directions, namely the reverse arrangement (one positive and one negative) of the two charging coils is adopted, the induced current in the form of a differential mode with opposite phases (namely phase difference of 180 degrees) of the original interference current (namely the interference current except the induced current) in the secondary coil is excited in the secondary coil by the mutual inductance of the primary coil to the secondary coil, the active control of the induced current in the form of the differential mode is realized, the total amount of the interference current in the secondary coil is reduced by reversely compensating the interference current, the interference of the secondary coil to the equipment to be charged is reduced, and in the CE test and the actual charging scene, the interference current flowing back to the power supply is correspondingly reduced, so that the quality of the power supply can be improved, thereby ensuring the performance and safety of other electric equipment using the power supply.

The charging circuit can be embodied in a c diagram in fig. 12, wherein the first port of one charging coil and the second port of another charging coil are simultaneously connected to one output node of the full-bridge inverter circuit, and the second port of the one charging coil and the first port of another charging coil are simultaneously connected to another output node of the full-bridge inverter circuit. Fig. 12 illustrates that the first port of the upper coil and the second port of the lower coil are connected to the second output node B, and the second port of the upper coil and the second port of the lower coil are simultaneously connected to the first output node a.

It should be noted that the positive and negative concepts of the charging coil mentioned in the embodiments of the present application are relative and not absolute. For example, at a fixed time, the direction of the current transmitted to the charging coil on the PCB is fixed, and if the magnetic field generated by this current in the charging coil is out of the paper, the charging coil can be defined as positive; if the magnetic field generated in the charging coil by this current is in a direction into the plane of the paper, the charging coil can be defined as being in the opposite direction. Of course, the positive and negative definitions can be reversed without affecting the implementation of the technical scheme of the application, and the same effect can still be achieved.

The following describes in detail the influence of the coil assembly shown in b of fig. 12 on the power supply in the wireless charging device based on the measured data:

TABLE 1

The two charging coils are arranged in opposite directions, namely the upper coil is positive and the lower coil is negative, and the upper coil is negative and the lower coil is positive. As can be seen from table 1, the voltages of the interference signals scanned by the spectrometer are greatly reduced when the two charging coils are arranged in opposite directions compared with the same direction. Most notably at the near 910KHz, the jammer voltage at 910KHz is 15.13dBuV (decibel microvolts) when the upper and lower coils are reversed (in reverse), and 30.79dBuV when the upper and lower coils are positive (in the same direction), with a 15dBuV difference. Meanwhile, at other frequency points, including 1.169MHz and 1.687MHz, the interference signal is reduced to different degrees under the condition that the upper coil is opposite to the lower coil. Similarly, when the upper and lower coils are in reverse (reverse set), the voltage of the jammer signal at 910KHz is 3.8dBuV, and when the upper and lower coils are in reverse (same set), the voltage of the jammer signal at 910KHz is 35.24dBuV, with a difference of more than 30 dBuV. Meanwhile, at 1.169MHz and 1.687MHz, when the upper coil is inverted and the lower coil is positive, the interference signal also drops by more than 13 dBuV. The comprehensive comparison shows that compared with the situation that two charging coils are arranged in opposite directions, the interference signal is greatly reduced.

In the CE test environment, when two charging coils are arranged in the same direction, the interference signal measured with the same sampling bandwidth is as shown in a diagram a in fig. 13, the peak value of the voltage of the interference signal is closer to the peak value limit, and the average value of the voltage of the interference signal is closer to the average value limit or even exceeds the limit. See in particular the data for the peaks in table 2 and the data for the mean values in table 3:

TABLE 2

Wherein, Level represents the measured voltage, and Limit represents the Limit value. Margin represents the Margin between the measured data and the limit, and generally we expect that Margin is as small as possible. The Detector represents the class of Detector and may also represent the detection mode, where QP represents the quasi-peak Detector and AVERAGE CISPR represents the mean Detector. RBW denotes a reference bandwidth. In general, the magnitude of the contrast values need to be compared on the same basis for RBW to be meaningful.

When the two charging coils are arranged in the opposite direction, the measured voltage of the interference signal is as shown in a b diagram in fig. 13 (the upper coil is positive, and the lower coil is reverse), the peak value of the voltage of the interference signal is far away from the peak value limit, the average value of the voltage of the interference signal is far away from the average value limit and no exceeding frequency point exists, as can be seen from the b diagram in fig. 13, the frequency point of higher harmonics disappears, for example, obvious harmonic interference does not occur at 910 kHz. See in particular the data for the peaks in table 4 and the data for the mean values in table 5:

TABLE 3

TABLE 4

TABLE 5

Comparing the data of table 2 and table 4 can see that two charging coil reverse settings compare two charging coil syntropies and set up, and the average value of interfering signal's voltage has reduced 10 dBuV. Comparing the data of table 3 and table 5, it can be seen that two charging coil syntropy settings are compared in two reverse settings of charging coil, and the peak value of interference signal's voltage also has the reduction of different degree, and especially the interference signal of 910kHz department that originally exceeds standard no longer exceeds standard, has descended more than 9dBuV, can satisfy the requirement of CE test.

In order to visually check the induced current existing in the secondary coil in the two charging coils arranged in opposite directions, an oscilloscope can be used for detecting the induced current at the secondary coil, and a waveform chart as shown in fig. 14 is obtained.

Meanwhile, through verification, the charging efficiency is hardly influenced by the two charging coils which are reversely arranged.

A conventional wireless charging device may further include three charging coils, for example, as shown in fig. 15, and the three charging coils are overlapped to satisfy the degree of freedom of charging. Based on the idea provided in this application, the charging coil located in the middle in fig. 15 can be reversed to implement active control reverse compensation of the interference signal.

Fig. 15 is a schematic diagram of a charging coil assembly including three charging coils according to an embodiment of the present application, and on the basis of diagram b in fig. 12, a third charging coil 1203 is further added. As shown in fig. 16, the third charging coil 1203 and the first charging coil 1201 partially coincide, and the third charging coil 1203 and the second charging coil 1202 do not coincide. When the first charging coil 1201 is charging, the charging current induces an inductive current in the third charging coil 1203. The third charging coil 1203 and the first charging coil 1201 are arranged in an opposite direction, and then the third charging coil 1203 and the second charging coil 1202 are arranged in the same direction. The reverse arrangement between the third charging coil 1203 and the first charging coil 1201 is such that the direction of the induced current in the third charging coil 1203 and the interference current in the third charging coil 1203 are opposite.

On the basis of fig. 16 described above, the direction of current flow when the main coil is changed, e.g. the second charging coil 1202 is operated as the main coil, can be seen in fig. 17. When the direction of the charging current in the second charging coil 1202 is clockwise, an induced current in the first charging coil 1201 in the clockwise direction is generated, and the induced current in the first charging coil 1201 can reduce the originally counterclockwise interference current in the first charging coil 1201. Meanwhile, the counterclockwise interference current in the first charging coil 1201 can also excite a counterclockwise induced current in the third charging coil 1203, and the induced current in the third charging coil 1203 can reduce the originally clockwise interference current in the third charging coil 1203. In this way, the interference current in the secondary winding is reduced, thereby reducing the interference. Similarly, if the third charging coil 1203 is used as the main coil for charging, the interference current in the first charging coil 1201 and the second charging coil 1202 which are used as the secondary coils can be reduced, so that the effect of reducing the interference is achieved.

The directions of the three charging coils in fig. 16 are sequentially positive, negative and positive, alternatively, the directions of the three charging coils may also be sequentially negative, positive and negative. The arrangement mode is the same as the positive, negative and positive technical principle and the implementation effect shown in fig. 16, and thus, the description is omitted.

In the charging coil assembly shown in fig. 16, the charging coil assembly composed of three charging coils is more flexible than the charging coil assembly composed of two charging coils. Because the arrangement of the charging coils with opposite directions is adopted, namely each charging coil in the charging coils is provided with a charging coil arranged in the opposite direction, when any one charging coil is taken as the main coil, the charging current in the main coil excites the induced current of the auxiliary coil arranged in the opposite direction in the auxiliary coil through the mutual inductance of the main coil to the auxiliary coil, and the phase of the induced current is opposite to that of the interference current in the original auxiliary coil (namely the phase is 180 degrees different), so that the interference current can be counteracted, the active control of the induced current in the differential mode is realized, the total amount of the interference current in the auxiliary coil is reduced through the reverse compensation of the interference current, the interference of the auxiliary coil to the charging equipment is reduced, and the interference current flowing back to the power supply is correspondingly reduced in the CE test and the actual charging scene, so that the quality of the power supply can be improved, thereby ensuring the performance and safety of other electric equipment using the power supply.

Fig. 18 is a schematic diagram of a charging coil assembly including four charging coils according to an embodiment of the present application, and on the basis of fig. 16, a fourth charging coil 1204 is further added. As shown in fig. 18, the fourth charging coil 1204 partially coincides with the second charging coil 1202, and the fourth charging coil 1204 does not coincide with both the first charging coil 1201 and the third charging coil 1203. The current in the second charging coil 1202 (the interference current or charging current) induces an inductive current in the fourth charging coil 1204; the fourth charging coil 1204 and the second charging coil 1202 are arranged in reverse, and the reverse arrangement between the fourth charging coil 1204 and the second charging coil 1202 causes the induced current in the fourth charging coil 1204 and the interference current in the fourth charging coil 1204 to be in opposite directions. Namely, the orientations of the four charging coils are positive, negative, positive and negative in sequence.

The charging coil subassembly that four charging coils are constituteed compares two and the charging coil subassembly that three charging coil is constituteed, and the degree of freedom that charges improves. Because the arrangement of the charging coils with opposite directions is adopted, namely each charging coil in the charging coils has the charging coil arranged in the opposite direction with the charging coil, when any one charging coil is taken as the main coil, the charging current in the main coil excites the induced current of the auxiliary coil arranged in the opposite direction with the charging current in the auxiliary coil through the mutual inductance of the main coil to the auxiliary coil, and the phase of the induced current is opposite to that of the interference current in the original auxiliary coil (namely the phase is 180 degrees different), so that the interference current can be counteracted, the active control of the induced current in the differential mode is realized, the total amount of the interference current in the auxiliary coil is reduced through the reverse compensation of the interference current, the interference of the auxiliary coil to the charging equipment is reduced, and then in the CE test and the actual charging scene, the interference current flowing back to the power supply is correspondingly reduced, and the quality of the power supply can be improved, thereby ensuring the performance and safety of other electric equipment using the power supply.

In the embodiment shown in fig. 18, no matter which charging coil is used as the main coil to be charged, at least one reversely arranged secondary coil is partially overlapped with the main coil, so that the charging current can excite an induced current in the partially overlapped secondary coil, thereby cancelling the original interference current, realizing the scheme of actively controlling reverse compensation, and reducing the interference. The implementation principle and the technical effect in this embodiment can be referred to in fig. 12 b, fig. 16 and fig. 17, and are not described herein again.

In some embodiments, when the number of the charging coils is greater than or equal to 3, an "always" secondary coil may be specially configured as the interference elimination coil, and mutual inductance between the secondary coil and the secondary coil is used to cancel the interference signal. Especially, when the quantity of charging coil was more than four, it had been difficult to guarantee the reverse setting between two liang of charging coils to carry out reverse setting through selecting the charging coil, consequently can adopt special interference signal that goes in the secondary coil of disturbing coil to offset.

As shown in fig. 19, there are three charging coils in fig. 19 as an example, the three charging coils are arranged in the same direction, and the descrambling coil 1901 and the three charging coils are arranged in the opposite direction. For example, the descrambling coil 1901 may be set to reverse direction, and the disturbing current in the descrambling coil 1901 may induce a current in the charging coil 1902, the charging coil 1903 and the charging coil 1904. When the charging coil 1901 is charged as the main coil, a disturbance current also exists in the descrambling coil 1902, the charging coil 1903 and the charging coil 1904 as the sub-coils. Since the descrambling coil 1901 is disposed in an opposite direction to the charging coil 1902, the charging coil 1903 and the charging coil 1904, respectively, an induced current excited by the descrambling current in the descrambling coil 1901 in the charging coil 1902 can cancel the disturbing current in the charging coil 1902, and similarly, an induced current excited by the descrambling current in the descrambling coil 1901 in the charging coil 1903 can cancel the disturbing current in the charging coil 1903, and an induced current excited by the descrambling current in the charging coil 1901 in the charging coil 1904 can cancel the disturbing current in the charging coil 1904.

Of course, in the example of three charging coils and one descrambling coil 1901 shown in fig. 19, the shape of the descrambling coil 1901 may also be changed, and the size of the descrambling coil 1901 may also be adjusted, for example, to be larger or smaller. For example, the descrambling coil 1901 may be an ellipse as shown in a diagram in fig. 19, a circle with a larger size as shown in b diagram in fig. 19, a circle with a smaller size as shown in c diagram in fig. 19, a square with a smaller size as shown in d diagram in fig. 19, a square with a larger size as shown in e diagram in fig. 19, a triangle as shown in f diagram in fig. 19, etc., which are not listed here. As long as it can be guaranteed that the de-interference coil 1901 has a heavily-summed portion with each charging coil, the interference current in the de-interference coil 1901 can excite the induced current in other charging coils, and the induced current excited in each charging coil can reduce the original interference current, thereby realizing the anti-interference effects of active control and reverse compensation.

Fig. 20 is a schematic view of a charging coil assembly different from the arrangement of the three charging coils in fig. 19, in fig. 20, the three charging coils are vertically arranged, and the shape of the interference canceling coil is a rounded rectangle, and the charging coil assembly can be formed by combining the three charging coils.

Optionally, most of the charging coils in the embodiments of the present application are illustrated as circular charging coils, and actually, the shape of the charging coils may also be other shapes, such as an oval shape, a rectangle shape, a square shape, a rounded long direction, a square shape, and the like, or may also be a combination of charging coils with different shapes, such as a circle shape, an oval shape, and the like, which is not limited to the embodiments of the present application.

In some embodiments, two ends of the descrambling coil 1901 may be respectively connected with a MOS transistor, and a body diode in the MOS transistor can control the descrambling coil to be in a floating state, and will not be charged as the main coil.

Each of the diagrams a, b, c and d in fig. 21 illustrates a charging coil assembly composed of four charging coils, the four charging coils are arranged in the same direction, the descrambling coil 1901 and the four charging coils are arranged in opposite directions, the shape and size of the descrambling coil 1901 may not be limited, and there is a portion where the descrambling coil 1901 is overlapped with each charging coil. When one of the four charging coils is operated, the other charging coils are not operated. Also, the descrambling coil 1901 does not operate. In the interference suppression coil 1901, there is an interference current that can excite an induced current in the same direction (clockwise or counterclockwise) in the other non-operating charging coils. Because each non-working charging coil also has interference current except the induced current, and the induced current excited in the non-working charging coil has opposite direction to the interference current, the induced current can reduce the original interference current, thereby reducing the interference signal and realizing the anti-interference effect of active control and reverse compensation.

In some embodiments, having the descrambling coil 1901 and the charging coil arranged in reverse, may be flipping the descrambling coil 180 degrees; or all the charging coils can be turned over by 180 degrees; alternatively, the first port of the descrambling coil 1901 is changed from being connected to the first output node a of the full-bridge inverter circuit to being connected to the second output node B of the full-bridge inverter circuit; or the first ports of all the charging coils are changed from the first output node a originally connected with the full-bridge inverter circuit to the second output node B connected with the full-bridge inverter circuit, which is not limited in the embodiment of the present application.

Alternatively, the size of the descrambling coil 1901 is not limited in this embodiment, as long as it can be overlapped with any one of the plurality of charging coils. Alternatively, the overlapping may be partial overlapping or complete overlapping, which is not limited herein. Therefore, it can be ensured that the descrambling coil 1901 can generate mutual inductance with other charging coils, and interference signals in the descrambling coil 1901 generate induced currents in other sub-coils, so as to cancel interference signals in other sub-coils.

When the number of the charging coils continues to increase, for example, five, six, eight, nine, twelve, fifteen or more, the interference signals in other secondary coils can be cancelled by the reverse arrangement of the interference removing coil and other charging coils. In this application embodiment, no longer enumerate the charging coil assembly that other quantity's charging coil is constituteed one by one.

In some embodiments, the area of the non-overlapping area between the coverage area of the descrambling coil and the charging area covered by all the charging coils is less than the preset area difference threshold. That is, the coverage area of the interference elimination coil is higher than the coverage area of all other charging coils, for example, the non-overlapping area between the two is smaller than a certain preset area difference threshold. The preset area threshold value can be adjusted according to the requirement. Optionally, the coverage area of the interference elimination coil and the external profiles of the plurality of charging coils can also be completely overlapped, so that mutual inductance between the interference elimination coil and the charging coils can be ensured to the maximum extent, and interference signals can be counteracted to the maximum extent; and the outer profile coincidence of the coverage area of removing the interference coil and a plurality of charging coil, then the size of removing the interference coil can not surpass the charging area that a plurality of charging coils covered, consequently need not to occupy the area outside the charging area of a plurality of charging coils, just also need not to increase wireless charging device's size on foot.

Through making the area that removes the non-overlapping region between the charging area that the coverage area of disturbing coil and all charging coils covered be less than predetermineeing the area difference threshold value, can avoid the coverage area of avoiding disturbing the coil and the charging area that all other charging coils covered jointly overlap the low mutual inductance that leads to of degree, the induced-current of production is too weak, and is crossed low to interference current's offset, influences the effect of removing the interference. Therefore, the interference elimination coil can generate strong induced current by enough mutual inductance at each charging coil, the offset of the interference current is large, and the interference elimination effect is further ensured. In the actual charging process, the influence of the charging coil assembly on the power supply can be reduced, and the performance and the safety of other electric equipment using the power supply are ensured.

Fig. 22 a is a schematic diagram of a plurality of charging coil assemblies in a charging pad. The plurality of charging coils are arranged on the ferrite, and then the charging circuit is connected to realize wireless charging. In a diagram in fig. 22, the presence of 18 charging coils is illustrated, and these 18 charging coils are attached to a ferrite to ensure the quality factor of electromagnetic conversion. For such a plurality of charging coil assemblies, one large interference canceling coil 1901 may be used as the permanent secondary coil, and the interference canceling effect is achieved for the other secondary coils as shown in b diagram in fig. 22.

The embodiment of the application also provides a wireless charging device, which comprises one or more charging coil assemblies in the above embodiments. Can all carry out wireless charging to one in each charging coil subassembly and wait to charge equipment. When the wireless charging device comprises a plurality of charging coil assemblies in the above embodiments, a plurality of devices to be charged can also be charged wirelessly, wherein one charging coil is selected from each charging coil assembly as a main coil, and one device to be charged is charged wirelessly.

In some embodiments, the wireless charging device may be a wireless charging pad. When a user places a plurality of electronic devices such as a mobile phone and a smart watch with a wireless charging function in different areas of the wireless charging panel, the wireless charging panel can wirelessly charge the plurality of electronic devices at the same time.

Optionally, the charging coil assemblies in the wireless charging device may also share the same descrambling coil. The charging coil in this a plurality of charging coil subassemblies all sets up with the syntropy, goes to disturb coil and charging coil reverse arrangement. When each charging coil assembly charges a device to be charged, the interference elimination coil can excite induced current in the secondary coil which is not in a charging state, so that interference signals are counteracted. A plurality of charging coil subassemblies share same de-interference coil and can reduce the complexity of wireless charging device's structure, be convenient for manufacture.

The implementation principle and technical effect of the wireless charging device can be referred to the foregoing description about the charging coil assembly, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another apparatus, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, the replaced units may or may not be physically separated, and the components shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A charging coil assembly, comprising: the first charging coil and the second charging coil are partially overlapped, the first charging coil works, the second charging coil does not work, and a charging current in the first charging coil excites a first induction current in the second charging coil; meanwhile, a first interference current other than the first induced current due to interference is generated in the second charging coil;

the first charging coil and the second charging coil are arranged in opposite directions, and the opposite arrangement between the second charging coil and the first charging coil enables the first induced current in the second charging coil and the first interference current in the second charging coil to be opposite in direction.

2. The charging coil assembly of claim 1, applied to a wireless charging device, the wireless charging device comprises a full-bridge inverter circuit, the full-bridge inverter circuit comprises a first output node and a second output node, the ports of the first charging coil and the second charging coil are arranged in the same direction, and the first charging coil and the second charging coil are arranged in opposite directions, comprising:

the first port of the first charging coil is connected with the first output node, the second port of the first charging coil is connected with the second output node, the first port of the second charging coil is connected with the second output node, and the second port of the second charging coil is connected with the first output node.

3. The charging coil assembly of claim 1, wherein the port settings of the first charging coil and the second charging coil are the same, the first charging coil and the second charging coil are oppositely arranged, comprising:

the first charging coil is arranged in a turned manner, so that a first direction and a second direction are opposite, the first direction is a direction pointing to a second port of the first charging coil from a first port of the first charging coil along a winding direction of the first charging coil, and the second direction is a direction pointing to a second port of the second charging coil from the first port of the second charging coil along the winding direction of the second charging coil;

wherein the first direction is clockwise and the second direction is counterclockwise; or, the first direction is a counterclockwise direction, and the second direction is a clockwise direction.

4. The charging coil assembly of any of claims 1-3, wherein the first interference current comprises: the second charging coil is in at least one of interference current generated in a resonance state under the action of a metal-oxide semiconductor (MOS) field effect transistor connected with two ends, interference current which is interfered to the second charging coil through a printed circuit board, and interference current which is transmitted to the second charging coil through capacitive coupling between the charging current on the first charging coil and the second charging coil.

5. The charging coil assembly of any of claims 1-4, further comprising a third charging coil, the third charging coil partially overlapping the first charging coil, the third charging coil being inoperative, a charging current in the first charging coil exciting a second inductive current in the third charging coil; meanwhile, a second interference current due to interference is generated in the third charging coil in addition to the second induced current;

the third charging coil and the first charging coil are oppositely disposed, the reverse disposition between the third charging coil and the first charging coil being such that the second induced current and the second interference current are in opposite directions.

6. The charging coil assembly of claim 5, further comprising a fourth charging coil, the fourth charging coil partially overlapping the second charging coil, the fourth charging coil non-overlapping the first charging coil and the third charging coil, the fourth charging coil not operating;

the first interference current in the second charging coil induces a third induced current in the fourth charging coil; meanwhile, a third interference current due to interference is generated in the fourth charging coil in addition to the third induced current;

the fourth charging coil and the second charging coil are oppositely disposed, the reverse disposition between the fourth charging coil and the second charging coil being such that the third induced current and the third interference current are in opposite directions.

7. The utility model provides a charging coil subassembly, is applied to wireless charging device, wireless charging device includes full-bridge inverter circuit, full-bridge inverter circuit includes first output node and second output node, its characterized in that, the charging coil subassembly includes: a first charging coil and a second charging coil;

the first charging coil and the second charging coil are partially overlapped, and the port arrangement of the first charging coil and the port arrangement of the second charging coil are the same;

the first port of the first charging coil is connected with the first output node of the full-bridge inverter circuit, the second port of the first charging coil is connected with the second output node of the full-bridge inverter circuit, the first port of the second charging coil is connected with the second output node of the full-bridge inverter circuit, and the second port of the second charging coil is connected with the first output node of the full-bridge inverter circuit.

8. The charging coil assembly of claim 7, wherein the first charging coil is active and the second charging coil is inactive, a charging current in the first charging coil induces a first induced current in the second charging coil; meanwhile, a first interference current other than the first induced current due to interference is generated in the second charging coil;

wherein a first induced current in the second charging coil and a first interference current in the second charging coil are in opposite directions.

9. The charging coil assembly of claim 7 or 8, further comprising a third charging coil, the third charging coil partially coincident with the first charging coil, the third charging coil and second charging coil not coincident;

the port setting of third charging coil with first charging coil is the same, the first port of third charging coil is connected full-bridge inverter circuit the second output node, the second port of third charging coil is connected full-bridge inverter circuit the first output node.

10. The charging coil assembly of claim 9, wherein the third charging coil is inactive, the charging current in the first charging coil induces a second induced current in the third charging coil; meanwhile, a second interference current due to interference is generated in the third charging coil in addition to the second induced current;

wherein the second induced current and the second interference current have opposite directions.

11. A charging coil assembly, comprising: the charging device comprises a first charging coil and a second charging coil, wherein the first charging coil and the second charging coil are partially overlapped, and the port settings of the first charging coil and the second charging coil are the same;

12. The charging coil assembly of claim 11, wherein the first charging coil is active and the second charging coil is inactive, a charging current in the first charging coil induces a first inductive current in the second charging coil; meanwhile, a first interference current other than the first induced current due to interference is generated in the second charging coil;

13. A charging coil assembly, comprising: the charging device comprises a descrambling coil and a plurality of charging coils, wherein the descrambling coil and each charging coil in the plurality of charging coils are superposed, a first charging coil works, other charging coils except the first charging coil in the plurality of charging coils do not work, and the descrambling coil does not work, wherein the first charging coil is one of the plurality of charging coils;

generating a first interference current in the de-interference coil due to interference, generating a second interference current in the other charging coils due to interference, and generating an induced current in the other charging coils by the first interference current in the de-interference coil;

the interference elimination coil and the first charging coil are arranged in an opposite direction, and the opposite direction enables the directions of the induced current in the other charging coils and the second interference current to be opposite.

14. The charging coil assembly of claim 13, applied to a wireless charging device, the wireless charging device comprises a full-bridge inverter circuit, the full-bridge inverter circuit comprises a first output node and a second output node, the first charging coil and the de-interference coil have the same port configuration, and the de-interference coil and the first charging coil are arranged in an opposite direction, comprising:

the first port of the first charging coil is connected with the first output node, the second port of the first charging coil is connected with the second output node, the first port of the interference elimination coil is connected with the second output node, and the second port of the interference elimination coil is connected with the first output node.

15. The charging coil assembly of claim 13, applied to a wireless charging device, the wireless charging device comprises a full-bridge inverter circuit, the full-bridge inverter circuit comprises a first output node and a second output node, the first charging coil and the de-interference coil have the same port configuration, and the de-interference coil and the first charging coil are arranged in an opposite direction, comprising:

the de-interference coil is arranged in a reversed mode, so that a first direction and a second direction are opposite, the first direction is a direction from the first port of the first charging coil to the second port of the first charging coil along the winding direction of the first charging coil, and the second direction is a direction from the first port of the de-interference coil to the second port of the de-interference coil along the winding direction of the de-interference coil;

16. The charging coil assembly of any of claims 13-15, wherein an area of a non-overlapping area between a coverage area of the de-scrambling coil and a charging area covered by the plurality of charging coils is less than a preset area difference threshold.

17. The charging coil assembly of claim 16, wherein a coverage area of the de-scrambling coil coincides with an outer profile of a charging area covered by the plurality of charging coils.

18. The charging coil assembly of any of claims 13-17, wherein a number of the plurality of charging coils is greater than or equal to 4.

19. The utility model provides a charging coil subassembly, is applied to wireless charging device, wireless charging device includes full-bridge inverter circuit, full-bridge inverter circuit includes first output node and second output node, its characterized in that, the charging coil subassembly includes: a de-scrambling coil and a plurality of charging coils;

the de-interference coil and each charging coil in the plurality of charging coils are overlapped, and the port setting of each charging coil in the plurality of charging coils is the same as that of the de-interference coil;

the first port of each charging coil in the plurality of charging coils all with first output node connects, the second port of each charging coil in the plurality of charging coils all with second output node connects, the first port of de-disturbing coil connects the second output node, the second port of de-disturbing coil connects the first output node.

20. The charging coil assembly of claim 19, wherein a first charging coil is active, other charging coils of the plurality of charging coils except the first charging coil are inactive, and the de-perturbation coil is inactive, wherein the first charging coil is one of the plurality of charging coils;

generating a first interference current caused by interference in the interference elimination coil, and generating a second interference current caused by interference in a second charging coil, wherein the second charging coil is one of the other charging coils;

the first interference current in the de-interference coil generates an induced current in the second charging coil, wherein the induced current in the second charging coil and the second interference current are in opposite directions.

21. A charging coil assembly, comprising: the device comprises a descrambling coil and a plurality of charging coils, wherein the descrambling coil and each charging coil in the plurality of charging coils are superposed, and the port setting of each charging coil in the plurality of charging coils is the same as that of the descrambling coil;

the de-interference coil is arranged in a turnover mode, so that a first direction and a second direction are opposite, the first direction is the direction of the second port of the first charging coil along the winding direction of the first charging coil, the first charging coil is one of the charging coils, and the second direction is the direction of the second port of the de-interference coil along the winding direction of the de-interference coil.

22. The charging coil assembly of claim 21, wherein the first charging coil is active, other charging coils of the plurality of charging coils except the first charging coil are inactive, and the de-perturbation coil is inactive, wherein the first charging coil is one of the plurality of charging coils;

23. A wireless charging device comprising N charging coil assemblies according to any one of claims 1 to 22, wherein N is a positive integer.

24. The wireless charging device of claim 23, wherein N is a positive integer greater than 1, and wherein the wireless charging device is a wireless charging pad.