CN116455102A

CN116455102A - Charging coil assembly and wireless charging device

Info

Publication number: CN116455102A
Application number: CN202310371043.XA
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: 2023-07-18
Anticipated expiration: 2042-02-28
Also published as: WO2023160206A9; CN114552741B; CN116455102B; CN114552741A; WO2023160206A1

Abstract

The application relates to the field of wireless charging, provides a charging coil assembly and wireless charging device, include: the first charging coil and the second charging coil are partially overlapped, when the first charging coil is charged, the second charging coil is not charged, a charging current is generated in the charged first charging coil, a first interference signal is generated in the uncharged second charging coil, the first interference signal comprises a first induction current which is induced in the second charging coil by the charging current generated in the first charging coil, and a first interference current which is generated in the second charging coil and is generated due to interference and is except the first induction current; the first induced current in the second charging coil and the first disturbance current in the second charging coil are in opposite directions. The charging coil assembly can reduce interference signals in the auxiliary coil, so that interference of the interference signals on a power supply is reduced.

Description

Charging coil assembly and wireless charging device

The present application is a divisional application of a chinese patent application filed on 28 days of 2022, 2, with application number 202210191342.0, and application name "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

With the development of wireless charging technology, people have increasingly high requirements on the degree of freedom of charging. Taking a mobile phone with a wireless charging function as an example, a user hopes to place the mobile phone on a wireless charger at will to perform wireless charging, and the situation that the charging coil of the wireless charger and the charging coil in the mobile phone have overlarge deviation due to the deviation of the position of the mobile phone placed by the user is avoided, so that charging is unsuccessful or 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, there will always be a coil that overlaps the mobile phone to a high degree, and the mobile phone can be charged using this coil as the primary coil.

However, when the mobile phone is charged with this primary coil, the other secondary coils generate interference signals. These interference signals may cross-talk to the power supply through mutual inductance of the main coil and the auxiliary coil, or interference paths such as reference ground, so as to affect the stability of the power supply and affect other devices using the power supply.

Disclosure of Invention

The application provides a charging coil assembly and wireless charging device, can reduce the interference signal in the auxiliary coil to alleviate the interference to the power.

In a first aspect, there is provided 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 charging current in the first charging coil excites first induction current in the second charging coil; meanwhile, a first disturbance current other than the first induction current due to disturbance is generated in the second charging coil; the first charging coil and the second charging coil are arranged in opposite directions, and the first induction 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 the two charging coils which are reversely arranged, through mutual inductance of the main coil to the auxiliary coil, the charging current in the main coil excites induced current in a differential mode form of opposite phase (namely 180 degrees different in phase) with the original interference current in the auxiliary coil, active control of the induced current in the differential mode form is realized, and through reversely compensating the interference current, the total amount of the interference current in the auxiliary coil is reduced, and the interference of the auxiliary coil to the charging equipment is reduced. In CE test and actual charging, 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 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 including a full-bridge inverter circuit, the full-bridge inverter circuit including a first output node and a second output node, ports of the first charging coil and the second charging coil being set identically, the first charging coil and the second charging coil being set in reverse, 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. Alternatively, 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 may be a port inside the charging coil, and the second port is a port outside 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 the interference current that resonance state produced under the effect of the metal-oxide semiconductor MOS field effect transistor that both ends are connected, the interference current that cross-talk to the second charging coil through the printed circuit board, and the interference current that the charging current on the first charging coil passed to the second charging coil through the capacitive coupling with the second charging coil at least one.

In some possible implementations, the ports of the first charging coil and the second charging coil are set identically, the first charging coil and the second charging coil being set in opposite directions, including: the first charging coil is arranged in a turnover mode, so that the first direction and the second direction are opposite, the first direction is the 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 the 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 and the second direction is counterclockwise; 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 overlapping the first charging coil, the third charging coil not operating, a charging current in the first charging coil exciting a second induced current in the third charging coil; meanwhile, a second disturbance current other than the second induced current due to disturbance is generated in the third charging coil; the third charging coil and the first charging coil are arranged in opposite directions, and the second induction current in the third charging coil and the second interference current in the third charging coil are opposite in direction.

And compared with the charging coil assembly formed by two charging coils, the charging coil assembly formed by three charging coils has the advantage that the charging freedom degree is improved. Since an arrangement of oppositely facing charging coils is used, i.e. each of the charging coils has a charging coil arranged opposite thereto. Therefore, when any one of the charging coils is used as the main coil, the charging current in the main coil excites the induction current of the secondary coil which is arranged in the opposite direction to the primary coil in the secondary coil through the mutual inductance of the main coil to the secondary coil, and the induction current is opposite to the phase of the interference current in the primary coil (namely 180 degrees out of phase), so that the interference current in the secondary 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 auxiliary coil is reduced by reversely compensating the interference current, and the interference of the auxiliary coil to the equipment to be charged is reduced, so that the interference current flowing back to the power supply is correspondingly reduced in CE test and actual charging scenes, the quality of the power supply can be improved, and the performance and 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 interference current that resonance state produced under the effect of the MOS field effect transistor that both ends are connected, and the interference current that cross-talk to third charging coil through the printed circuit board, and the charging current on the first charging coil passes through the capacitive coupling with third charging coil and transmits to the interference current of third charging coil in at least one of.

In some possible implementations, the method 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, ports of a third charging coil and a first charging coil are set identically, the third charging coil and the first charging coil are set reversely, and the method includes: 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, the third charging coil and the first charging coil are oppositely disposed, including: the first charging coil is arranged in a turnover mode, so that the first direction is opposite to the third direction, the first direction is the 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 third direction is the direction from the first port of the third charging coil to the second port of the third charging coil along the winding direction of the third charging coil; wherein the first direction is clockwise and the third direction is counterclockwise; alternatively, the first direction is counter-clockwise 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 overlapping, the fourth charging coil not overlapping with neither the first charging coil nor the third charging coil, the fourth charging coil not operating; the first interference current in the second charging coil excites a third induction current in the fourth charging coil; meanwhile, a third disturbance current other than the third induced current due to disturbance is generated in the fourth charging coil; the fourth charging coil and the second charging coil are arranged in opposite directions, and the third induction current in the fourth charging coil and the third interference current in the fourth charging coil are opposite in direction.

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

And compared with a charging coil assembly consisting of two charging coils and three charging coils, the charging coil assembly consisting of four charging coils has the advantage that the charging freedom degree is improved. Since an arrangement of oppositely facing charging coils is employed, i.e. each of the charging coils has a charging coil arranged opposite thereto. Therefore, when any one of the charging coils is used as the main coil, the charging current in the main coil excites the induction current of the secondary coil which is arranged opposite to the primary coil in the secondary coil through the mutual inductance of the main coil to the secondary coil. This induced current is opposite in phase (i.e., 180 degrees out of phase) to the disturbance current in the original secondary winding, so that a portion of the disturbance current can be subtracted. Meanwhile, the induction current in the second charging coil can be excited in the fourth charging coil, and the induction current excited by the interference current in the second charging coil in the fourth charging coil is opposite to the original interference current in the fourth charging coil in direction due to the reverse arrangement of the fourth charging coil and the second charging coil, so that the interference current in the fourth charging coil can be reduced. This arrangement allows active control and reverse compensation of induced currents in the form of differential modes. The total amount of the interference current in the auxiliary coil is reduced by reversely compensating the interference current, and the interference of the auxiliary coil to the equipment to be charged is reduced, so that in CE test and actual charging scenes, the interference current flowing back to the power supply is correspondingly reduced, the quality of the power supply can be improved, and the performance and safety of other electric equipment using the power supply are ensured.

In some possible implementations, the method 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, ports of a fourth charging coil and a second charging coil are set identically, the fourth charging coil and the second charging coil are set reversely, and the method includes: 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 implementations, the method 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, ports of a fourth charging coil and a second charging coil are set identically, the fourth charging coil and the second charging coil are set reversely, and the method includes: the fourth charging coil is arranged in a turnover mode, so that the fourth direction is opposite to the second direction, the fourth direction is the direction from the first port of the fourth charging coil to the second port of the fourth charging coil along the winding direction of the fourth charging coil, and the second direction is the 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 fourth direction is clockwise and the second direction is counterclockwise; alternatively, the fourth direction is a counterclockwise direction and the second direction is a clockwise direction.

In a second aspect, there is provided a charging coil assembly 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 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 ports of the first charging coil and the second charging coil are identical; 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 coils, the ports of the charging coils may be defined, wherein the ports of the first charging coil and the second charging coil are set identically, one end of the inner side of the charging coil is used as a first port, and one end of the outer side of the charging coil is used as a second port.

The two charging coils are reversely arranged, the orientation of the charging coils can be kept unchanged, and the connection mode between the ports of the charging coils and the output node of the full-bridge inverter circuit can be changed. For example, the first port of the first charging coil is changed from being connected with the first output node to being connected with the second output node; meanwhile, the second port of the first charging coil is connected with the second output node instead of being connected with the first output node. 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, the first port of the first charging coil and the second port of the second charging coil are connected to one output node of the full-bridge inverter circuit, and the second port of the first charging coil and the first port of the second charging coil are connected to the other output node of the full-bridge inverter circuit. The arrangement can be such that the two charging coils are arranged in opposite directions.

In the implementation mode, the two charging coils are arranged in opposite phase by changing the connection mode between the ports of the charging coils and the output port of the full-bridge inverter circuit, the charging current in the main coil can be excited in the auxiliary coil to induce current in a differential mode form with opposite phase (namely 180 degrees different in phase) with the original interference current in the auxiliary coil through mutual inductance of the main coil to the auxiliary coil, active control of the induced current in the differential mode form is realized, and the total amount of the interference current in the auxiliary coil is reduced through reverse compensation of the interference current, so that the interference of the auxiliary coil to the charging equipment is reduced. In CE test and actual charging, 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 equipment using the power supply are ensured.

In some possible implementations, the first charging coil is operated and the second charging coil is not operated, and the charging current in the first charging coil excites a first induced current in the second charging coil; meanwhile, a first disturbance current other than the first induction current due to disturbance is generated in the second charging coil; the first induction current in the second charging coil and the first interference current in the second charging coil are opposite in direction.

In some possible implementations, the charging coil assembly further includes a third charging coil, the third charging coil and the first charging coil partially overlapping, the third charging coil and the second charging coil not overlapping; the ports of the third charging coil and the first charging coil are arranged identically, the first port of the third charging coil is connected with the second output node of the full-bridge inverter circuit, and the second port of the third charging coil is connected with the first output node of the full-bridge inverter circuit.

In the implementation manner, the first port of the third charging coil is connected with the second output node of the full-bridge inverter circuit, and the second port of the third charging coil is connected with the first output node of the full-bridge inverter circuit, so that the directions of any two coincident charging coils are opposite, namely, any two coincident charging coils are reversely arranged. Because the arrangement of the charging coils facing opposite directions is adopted, namely, each charging coil in the charging coils is provided with one charging coil which is arranged opposite to the charging coil, when any one charging coil is used as a main coil, the charging current in the main coil excites the induction current of the auxiliary coil which is arranged opposite to the main coil in the auxiliary coil through the mutual inductance of the main coil to the auxiliary coil, the induction current is opposite to the phase of the interference current in the original auxiliary coil (namely, 180 degrees out of phase), so that the interference current can be counteracted, the active control of the induction current in a 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 a charging device is reduced, and then in CE test and actual charging scenes, the interference current which flows back to a power supply is correspondingly reduced, the quality of the power supply can be improved, and the performance and the safety of electric equipment using the power supply are ensured.

In some possible implementations, the third charging coil is not operated, and the charging current in the first charging coil excites a second induced current in the third charging coil; meanwhile, a second disturbance current other than the second induced current due to disturbance is generated in the third charging coil; wherein the second induced current and the second disturbance current are in opposite directions.

In a third aspect, there is provided a charging coil assembly comprising: 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 identical; the first charging coil is arranged in a turnover mode, so that the first direction and the second direction are opposite, the first direction is the direction from a first port of the first charging coil to a second port of the first charging coil along the winding direction of the first charging coil, and the second direction is the direction from a first port of the second charging coil to a second 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; alternatively, the first direction is counterclockwise and the second direction is clockwise.

Through the overturning arrangement of the first charging coil, the first charging coil and the second charging coil are reversely arranged, the secondary coil can be mutually induced by the primary coil, so that the charging current in the primary coil excites the induced current in the secondary coil in a differential mode form with opposite phase (namely 180 degrees out of phase) with the original interference current in the secondary coil, 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 by reversely compensating the interference current, and the interference of the secondary coil on equipment to be charged is reduced. In CE test and actual charging, 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 equipment using the power supply are ensured.

In a fourth aspect, there is provided a charging coil assembly comprising: the system comprises a descrambling coil and a plurality of charging coils, wherein each of the descrambling coil and the plurality of charging coils is overlapped, 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 due to interference in the descrambling coil, generating a second interference current due to interference in the other charging coils, and generating an induced current in the other charging coils by the first interference current in the descrambling coil; the descrambling coil and the first charging coil are arranged in a reverse direction, and the reverse direction causes the induction current and the second interference current in the other charging coils to be opposite.

When the number of charging coils is 3 or more, it has been difficult to ensure the reverse arrangement between the charging coils by selecting the charging coils for the reverse arrangement, and thus it is possible to use a dedicated descrambling coil to cancel the interference signal in the sub-coil.

Through setting up the descrambling coil to with the reverse setting of descrambling coil and other charging coils, when making arbitrary charging coil as the main coil, the descrambling coil can all produce mutual inductance to the auxiliary coil, and the excitation plays the induced current with the opposite phase (i.e. 180 degrees phase difference) of original interference current in the auxiliary coil. The induced current can counteract the interference current in the same auxiliary coil, and 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 by reversely compensating the interference current, and the interference of the auxiliary coil to the equipment to be charged is reduced, so that in CE test and actual charging scenes, the interference current flowing back to the power supply is correspondingly reduced, the quality of the power supply can be improved, and the performance and 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 including a full-bridge inverter circuit including a first output node and a second output node, ports of the first charging coil and the descrambling coil are set identically, the descrambling coil and the first charging coil are set inversely, 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 descrambling coil is connected with the second output node, and the second port of the descrambling 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 including a full-bridge inverter circuit including a first output node and a second output node, ports of the first charging coil and the descrambling coil are set identically, the descrambling coil and the first charging coil are set inversely, including: the descrambling 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 pointing to a second port of the first charging coil along the winding direction of the first charging coil by a first port of the first charging coil, and the second direction is the direction of pointing to a second port of the descrambling coil along the winding direction of the descrambling coil by a first port of the descrambling coil; wherein the first direction is clockwise and the second direction is counterclockwise; alternatively, the first direction is counterclockwise and the second direction is clockwise.

In some possible implementations, an area of a non-overlapping region 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.

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 smaller than the preset area difference threshold, the phenomenon that the mutual inductance caused by the low overlapping degree of the coverage area of the descrambling coil and the charging area covered by all other charging coils is too weak, the generated induced current is too weak, the offset of the interference current is too low, and the interference removal effect is influenced can be avoided. Therefore, the interference elimination coil can be ensured to have enough mutual inductance to generate stronger induction current at each charging coil, and the offset of the interference current is larger, so that the interference elimination effect is 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 coincides with the outer contour of the charging area covered by the plurality of charging coils.

Therefore, the mutual inductance between the descrambling coil and the charging coil can be ensured to the greatest extent, and interference signals can be counteracted to the greatest extent; and the coverage area of the descrambling coils is overlapped with the external outlines of the plurality of charging coils, so that the size of the descrambling coils does not exceed the charging area covered by the plurality of charging coils, and therefore, the area outside the charging area of the plurality of charging coils is not occupied, and the size of the wireless charging device is not increased.

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, applied to a wireless charging device, the wireless charging device including a full-bridge inverter circuit, the full-bridge inverter circuit including a first output node and a second output node, the charging coil assembly comprising: a descrambling coil and a plurality of charging coils; the descrambling coils are overlapped with each of the plurality of charging coils, and the ports of each of the plurality of charging coils and the descrambling coils are identical; the first port of each charging coil in the plurality of charging coils is connected with a first output node, the second port of each charging coil in the plurality of charging coils is connected with a second output node, the first port of the descrambling coil is connected with the second output node, and the second port of the descrambling coil is connected with the first output node.

In the implementation mode, the two charging coils are arranged in opposite phase by changing the connection mode between the ports of the charging coils and the output port of the full-bridge inverter circuit, the interference current in the descrambling coils can excite the induced current in the auxiliary coils in a differential mode with opposite phase (namely 180 degrees different in phase) with the original interference current in the auxiliary coils through mutual inductance of the descrambling coils to the spoke coils, so that the interference current in the auxiliary coils is reduced, active control of the induced current in the differential mode is realized, the total amount of the interference current in the auxiliary coils is reduced, and the interference of the auxiliary coils to the charging equipment is reduced. In CE test and actual charging, 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 equipment using the power supply are ensured.

In some possible implementations, the first charging coil is active, other charging coils of the plurality of charging coils than the first charging coil are inactive, and the descrambling 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 descrambling 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 disturbance current in the de-disturbance coil generates an induced current in the second charging coil, wherein the induced current in the second charging coil and the second disturbance current are in opposite directions.

In a sixth aspect, there is provided a charging coil assembly comprising: the device comprises a descrambling coil and a plurality of charging coils, wherein each of the descrambling coil and the plurality of charging coils is overlapped, and the ports of each of the plurality of charging coils and the descrambling coil are identical; the descrambling coil is turned over and arranged so that a first direction and a second direction are opposite, the first direction is a direction that a first port of a first charging coil points to a second port of the first charging coil along a winding direction of the first charging coil, the first charging coil is one of the plurality of charging coils, and the second direction is a direction that a first port of the descrambling coil points to.

Through the reverse setting of the descrambling coils, the descrambling coils and each charging coil can be reversely arranged, the interference current in the descrambling coils can excite the induced current in the auxiliary coils in a differential mode form with opposite phase (namely 180 degrees out of phase) with the original interference current in the auxiliary coils through mutual inductance of the descrambling coils, so that the interference current in the auxiliary coils is reduced, active control of the induced current in the differential mode form is realized, the total amount of the interference current in the auxiliary coils is reduced through reverse compensation of the interference current, and the interference of the auxiliary coils to the charging equipment is reduced. In CE test and actual charging, 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 equipment using the power supply are ensured.

In a seventh aspect, there is provided a wireless charging device including N charging coil assemblies as in any one of the first to sixth aspects, wherein N is a positive integer.

Each charging coil assembly can wirelessly charge one device to be charged. When the wireless charging device includes a plurality of charging coil assemblies in the foregoing embodiments, a plurality of devices to be charged may be charged simultaneously by wireless charging, where each charging coil assembly selects one charging coil as a main coil, and one device to be charged is charged wirelessly. The principle and advantageous effects of the implementation can be seen from 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 devices such as a mobile phone with a wireless charging function and an intelligent watch in different areas of the wireless charging plate, the wireless charging plate can simultaneously perform wireless charging on the plurality of electronic devices, and meanwhile interference current transmitted to the device to be charged by the secondary coil is reduced. 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 of 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 vertical or horizontal;

fig. 3 is a schematic diagram of overlapping situations 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;

FIG. 4 is a schematic diagram of an example secondary equivalent LC resonant circuit provided in an embodiment of the present application;

fig. 5 is a schematic diagram of a path of a secondary coil as an interference source for transmitting an interference signal to a device to be charged in an exemplary general wireless charging device according to an embodiment of the present application;

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

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

FIG. 8 is a schematic flow diagram of an interference signal in a test environment of a CE test according to an embodiment of the present disclosure;

Fig. 9 is a schematic diagram illustrating the orientations of two charging coils in a conventional charging device according to an embodiment of the present application;

fig. 10 is a schematic diagram illustrating the orientations of two oppositely disposed charging coils according to an embodiment of the present disclosure;

fig. 11 is a schematic diagram illustrating the orientations of two oppositely disposed charging coils according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram showing a comparison of the directions of the charging current of the main coil and the induced current excited in the sub-coil, for an example, in the case of the same-direction arrangement and the opposite-direction arrangement according to the embodiment of the present application;

FIG. 13 is a sample graph of an interference signal in an exemplary CE test environment provided by an embodiment of the present application;

FIG. 14 is a waveform diagram of an induced current induced by excitation in an example secondary coil provided in an embodiment of the present application;

FIG. 15 is a physical diagram of an exemplary universal charging coil assembly with three charging coils provided in accordance with an embodiment of the present application;

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

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

FIG. 19 is a schematic diagram of an example of a charging coil assembly including three charging coils and a de-scrambling coil according to an embodiment of the present application;

FIG. 20 is a schematic diagram of a charging coil assembly including three charging coils and a de-scrambling coil according to another embodiment of the present application;

FIG. 21 is a schematic diagram of an example of a charging coil assembly including four charging coils and a de-scrambling coil according to an 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 an 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. Wherein, in the description of the embodiments of the present application, "/" means or is meant unless otherwise indicated, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

In the following, the terms "first", "second", "third", "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, a feature defining "a first", "a second", "a third" and a fourth "may explicitly or implicitly include one or more such feature.

The coil assembly provided in the embodiments of the present application may be used in a wireless charging device, such as a wireless charger or a wireless charging pad of a mobile phone, and the specific type of the wireless charging device is not limited in the embodiments of the present application.

Generally, a wireless charging device mainly adopts the principle of electromagnetic induction, and energy is coupled through a coil so as to realize energy transmission. In order to improve the degree of freedom of charging, a plurality of charging coils with different positions are generally arranged in the wireless charging device to realize charging of the to-be-charged devices at different positions. Taking a mobile phone with a wireless charging function as an example, a user hopes 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, so that the position of a charging coil used for transmitting by the wireless charger and the position of a charging coil used for receiving by the mobile phone deviate too much is avoided, and the charging is unsuccessful or the charging efficiency is low. If a plurality of charging coils at different positions are arranged in the wireless charging device, when a user randomly places the mobile phone on the wireless charger, the overlapping degree of one charging coil and the charging coil in the mobile phone is high, and the mobile phone can charge by taking the charging coil as a main coil.

Taking a wireless charging stand for wireless charging of a mobile phone as an example, fig. 1 is a schematic view of an external appearance structure of the wireless charging stand, where the wireless charging stand 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 stand as shown in a diagram in fig. 2, as can be seen from a side view of the wireless charging stand shown in b diagram in fig. 2, the overlapping degree of the charging coil 2021 in the mobile phone 202 and the upper coil 103 located above in the wireless charging stand is relatively high, 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 horizontally as shown in fig. 2 c, it can be seen from the side view of the wireless charging stand shown in fig. 2 d that the charging coil 2021 in the mobile phone 202 and the lower coil 104 located below the wireless charging stand overlap to a relatively high degree, and then the lower coil 104 can be selected to perform wireless charging on the mobile phone. Therefore, when the wireless charging seat is used for charging, the mobile phone can be charged efficiently whether the mobile phone is horizontally or vertically placed.

In general, when a wireless charging device includes a plurality of charging coils, there is a certain degree of overlap between areas covered by the plurality of charging coils. Taking the example that two charging coils exist in the wireless charging device shown in fig. 3 as an example, if the two charging coils are not overlapped as shown in a diagram a in fig. 3, when the mobile phone 201 is placed in an area between the two charging coils, the overlapping degree of the charging coil 2021 serving as a receiving coil inside the mobile phone 201 and any charging coil in the wireless charging device is low, so that the charging efficiency is affected and even charging is not performed. Therefore, in a wireless charging device in general, two charging coils may be partially overlapped as shown in b diagram in fig. 3. When the mobile phone 201 moves from the position corresponding to one charging coil to the other charging coil in the wireless charging device, there is always a high overlapping degree between the one charging coil and the charging coil 2021 inside the mobile phone 201, so that the wireless charging device can select the one charging coil to charge the mobile phone efficiently, and a charging blind area does not exist. That is, in the case of the mobile phone 201 in the position shown in the b-diagram 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 providing the charging coils overlapping one part.

When the to-be-charged device is placed on the wireless charging device, the to-be-charged device sends a signal for requesting charging to the wireless charging device, so that the overlapping degree of which charging coil in the wireless charging device and the charging coil in the to-be-charged device is high is detected. Then, the wireless charging device can perform wireless charging by using the charging coil with high overlapping degree of the charging coil in the wireless charging device and the charging coil in the device to be charged as the main coil. In some embodiments, after the wireless charging device selects the main coil, a handshake process may be performed between the wireless charging device and the device to be charged, so as to ensure that subsequent charging is performed smoothly, and charging is performed after the handshake process passes.

When the main coil in the wireless charging device is used for carrying out wireless charging on the equipment to be charged, other charging coils in the wireless charging device are used as secondary coils, and the secondary coils cannot charge the equipment to be charged. At this time, an interference signal exists in the sub-coil. Here we refer to all useful signals that cannot be used as charging as interference signals. These interference signals may cross-talk to the power supply through mutual inductance of the main coil and the sub-coil, or interference paths such as reference ground, so as to affect the stability of the power supply and affect other devices using the power supply.

First, a charging circuit in a wireless charging device is outlined. Taking two charging coils, namely an upper coil and a lower coil, in the wireless charging device as an example, referring to a diagram a in fig. 4, a full-bridge inverter circuit is included in the charging circuit and is used for connecting a power supply and the charging coils, wherein the full-bridge inverter circuit includes a first output node A and a second output node B. The two ports of the charging coil are respectively connected with the first output node A and the second output node B so as to acquire electric energy to charge the belt charging equipment.

However, when the main coil is operated, that is, when the main coil is charged, an interference signal is generated in the non-operated sub-coil. Taking a charging circuit shown in a diagram of fig. 4 as an example, a description will be given of a source of an interference signal generated in a secondary coil in a wireless charging device:

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

2. Other interfering signals are also transferred to the secondary coil by capacitive coupling on the printed circuit board (printed circuit board, PCB). Taking the diagram a in fig. 4 as an example, the interference signal is coupled from the PCB on which the full-bridge inverter circuit is arranged to the upper coil as the sub-coil through the equivalent capacitance C1 as shown in the diagram a in fig. 4.

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

4. The interference signal is transferred to the secondary coil through mutual inductance between the charging coils. Although the charging current is alternating current, the direction will change over time, at a fixed instant the direction of the charging current is fixed. For example, as shown in fig. 6, the direction of the charging current in the lower coil as the main coil is clockwise, and this charging current generates induced electromotive force in the upper coil as the sub-coil, so that the induced current is excited, and this induced current is also clockwise. If the interference current exists in the original upper coil, the direction of the interference current is clockwise, and the induction current is overlapped on the original interference current, so that the interference is aggravated. In order to clearly show the current flowing in the charging coil, the number of turns of the charging coil is shown as 1 in fig. 6, and actually, the number of turns of the charging coil may be plural, and at the same time, the current flowing in the same type of the coil in each turn is the same.

Taking two charging coils including an upper coil and a lower coil in the wireless charging device as an example, when the lower coil is used as the main coil for charging, since the full-bridge inverter circuit is disposed on the PCB, an interference signal in the form of a differential mode can be coupled from the PCB to the upper coil as the sub-coil through the equivalent capacitor C1 along the path 1 as shown in a diagram of fig. 4, and reflowed to the equivalent. In this process, the secondary coil converts the high frequency component of the interference signal into an interference signal in the form of a common mode, which is transmitted to the device to be charged. In addition, the secondary coil can provide a path 2 as shown in fig. 7 for the interference signal in the differential mode brought by the primary coil, 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 common-mode and transmit the interference signal to the device to be charged. 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 an interference signal to the device to be charged. During the actual charging process, the interference signals coupled to the device to be charged are coupled to the power supply through various coupling paths, thereby affecting other consumers using the power supply. To ensure proper use of other powered devices on the same power supply, a conductive disturbance (conducted emission, CE) test is required for the wireless charging device. The CE test is a test item required to be tested, which is specified by regulations, and is used for testing whether the interference degree of the wireless charging device on the power supply in the wireless charging process meets the requirement. In the CE test process, the test environment is a charging scene simulating daily use of a user, and here, we take the test environment of the CE test as an example to describe an interference path of an interference signal transmitted to the equipment to be charged. As shown in FIG. 8, the test environment includes a test bench and a manual power network (LISN). The wireless charging device to be tested is arranged on the test bench, and the equipment to be charged is placed on the base of the wireless charging device to be charged in a wireless mode. The LISN is used as a power supply for supplying power to the test environment and is connected with a power socket through a power line. The power line of the wireless charging device is connected to the power socket to take electricity. Meanwhile, a detection circuit is integrated in the LISN, and is used for detecting an interference signal, outputting a detection result to a spectrometer, and observing the magnitude of the interference signal through the spectrometer. The magnitude of the interference signal is described in terms of an interference voltage, that is, if the interference voltage detected by the detector is large, it is indicated that the interference of the wireless charging device to the power supply is large, and if the interference voltage detected by the detector is small, it is indicated that the interference of the wireless charging device to the power supply is small.

When the interference signal is coupled from the secondary coil of the wireless charging device to the device to be charged through the capacitive coupling between the secondary coil in the wireless charging device and the device to be charged, the interference signal may have a backflow condition. As shown in fig. 8, there is also a capacitive coupling between the device to be charged and the reference ground, which may be equivalently the equivalent capacitance C4. When the device to be charged is inserted into the earphone, larger capacitive coupling exists between the earphone wire and the reference ground, and the equivalent capacitance C5 can be obtained. At this time, the path of the disturbance signal originally on the device to be charged forms a disturbance loop as shown by the broken line in fig. 8, and the arrow direction indicates the flow direction of the disturbance signal on this disturbance loop. In the test scenario shown in fig. 8, the LISN may be equivalent to a power supply for home in an actual application scenario, and if the detector detects a larger voltage, it indicates that the power supply for home may carry a larger interference signal. Once other electric equipment is connected to the household power supply, the power supply of the other electric equipment can bring in the interference signal, and the performance or safety of the other electric equipment is affected.

In the scheme provided by the application, through the orientation of the partial charging coil of adjustment for the charging coil after adjustment is in other charging coils response be in the opposite induced current of the direction with original interference current, offset interference current from this, thereby realized the active control to interference current. Because the interference current on the secondary coil in the wireless charging device is reduced from the root, the interference current coupled to the equipment to be charged is weakened, the interference to the power supply is reduced, and the performance and the safety of other electric equipment are ensured.

First, taking an example that the wireless charging device has two charging coils, the technical scheme and implementation principle of the present application will be described in detail.

The conventional two charging coils may refer to the orientations of the two charging coils shown in fig. 9, and the two charging coils in fig. 9 are not overlapped and do not represent that they are not overlapped, but the two charging coils may be partially overlapped in practice in order to clearly show the illustrations of the orientations of the two coils, for example, as shown in fig. 1. In fig. 9, the first charging coil and the second charging coil are disposed in the same direction, i.e., the charging coils are oriented in the same direction. In order to clearly describe the orientation of the charging coils, the ports of the charging coils may be defined, wherein the ports of the first charging coil and the second charging coil are set identically, one end of the inner side of the charging coil is used as a first port, and one end of the outer side of the charging coil is used as a second port.

Two charging coils arranged in the same direction can generate larger interference current, so that the power supply is interfered. In the embodiment of the application, one of the charging coils may be turned over, so that the two charging coils are reversely arranged to reduce interference. Taking the second charging coil flip setting as an example, the second charging coil flip setting is performed without changing the port connection mode. For example, as shown in fig. 10, the inverted second charging coil and the first charging coil that is not inverted are two charging coils that are disposed in opposite directions. After the second charging coil is turned over, the first port of the second charging coil is along the winding direction of the second charging coil, and the direction pointing to the second port of the second charging coil is anticlockwise; the first port of the first charging coil is along the winding direction of the first charging coil, and the direction pointing to the second port of the first charging coil is clockwise. That is, after the second charging coils are turned over, the directions of the first ports of the two charging coils pointing to the second ports along the respective winding directions are opposite.

When the first charging coil operates as the main coil, the second charging coil does not operate as the sub-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 inverted arrangement of the second charging coil, the direction of the induced current is changed, and the direction of the interference current (including the interference current caused by the source 1, the source 2 and the source 3 above) is opposite to that of the induced current, so that part of the interference current is offset, and the interference is reduced.

When the second charging coil operates as the main coil, the first charging coil does not operate as the sub-coil. The charging current in the second charging coil excites the induced current in the first coil, and at the same time, other disturbance currents than the induced current due to disturbance are generated in the second charging coil. The second charging coil is turned over, so that the direction of the induced current is changed, and the induced current is opposite to the direction of the interference current, so that a part of interference current is counteracted, and the interference is reduced.

Optionally, on the basis of fig. 9, the technical solution of the present application may also be to turn the first charging coil over, so that the turned first charging coil and the second charging coil without turning over are two charging coils that are set in opposite directions. After the first charging coil is turned over, a first port of the first charging coil is along the winding direction of the first charging coil, and the direction pointing to a second port of the first charging coil is anticlockwise; the 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 is clockwise. That is, after the first charging coils are turned over, the directions of the first ports of the two charging coils pointing to the second ports 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 induction current excited by the main coil in the secondary coil and other interference currents except the primary induction current in the secondary coil are opposite in direction, so that part of interference currents are offset, and interference is reduced.

In some embodiments, the two charging coils are arranged in opposite directions, so that the orientation of the charging coils is kept unchanged, and the connection mode between the ports of the charging coils and the output node of the full-bridge inverter circuit is changed. 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 connected with the second output node B instead of the first output node A. 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, the first port of the first charging coil and the second port of the second charging coil are connected to one output node of the full-bridge inverter circuit, and the second port of the first charging coil and the first port of the second charging coil are connected to the other output node of the full-bridge inverter circuit. The arrangement can be such that the two charging coils are arranged in opposite directions.

At a certain moment, when the direction of the 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 non-operating sub-coil (second charging coil), and the direction of the disturbing current other than the induced current in the second charging coil as the sub-coil is clockwise from the first output node a toward the second output node B along the winding direction of the second charging coil. At this time, the sense current and the interference current are opposite in direction, so that the sense current can cancel part of the interference current, thereby reducing interference. If the second charging coil is operated 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-operated secondary coil (first charging coil), and the direction of the disturbing current other than the induced current in the second charging coil as the secondary coil 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 sense current and the interference current are opposite in direction, so that the sense current can cancel part of the interference current, thereby reducing interference.

Similarly, if the direction of the charging current flows from the second output node B to the first output node a, the charging current in the main coil generates an induced current in the sub-coil in the same direction as the charging current (clockwise or counterclockwise), which is opposite to the direction of the disturbing current originally existing in the sub-coil except for the induced current, regardless of whether the first charging coil operates as the main coil or the second charging coil operates as the main coil.

Next, the directions of the induced current and the disturbance current are described with reference to the charging coil current direction diagram in fig. 12. An example is illustrated in fig. 12 in which the first charging coil is a lower coil and the second charging coil is an upper coil. At a fixed time, as in a diagram a of fig. 12, the lower coil is charged as the charged main coil, and at this time, there is a charging current in the main coil, and the charging current is clockwise. At the same time, the charging current in the main coil excites a magnetic field inward toward the paper surface in the upper coil as the sub-coil, thereby inducing an induced current in the clockwise direction. There is also an interference signal in the form of a common mode, which is brought about by other means in the secondary winding, the interference current being clockwise. The induced current and the disturbance current have the same direction, which aggravates the disturbance. In the technical solution of the present application, the first charging coil 1201 and the second charging coil 1202 are reversely arranged. The first charging coil 1201 may be turned over 180 degrees, or the second charging coil 1202 may be turned over 180 degrees. For example, see fig. 12 b, which illustrates the inverted first charging coil 1201 in fig. 12 b. After the first charging coil 1201 is turned 180 degrees, the first charging coil 1201 and the second charging coil 1202 are arranged in opposite directions, and the charging current in the 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 is outwards in the upper coil serving as the auxiliary coil, and meanwhile, the direction of an induced current excited by the charging current in the upper coil is changed from the clockwise direction to the counterclockwise direction. Therefore, interference is not aggravated, interference current in the original upper coil is counteracted, the effect of inhibiting the interference current is achieved, the total amount of the interference current is reduced, and therefore the interference of the auxiliary coil to the equipment to be charged is reduced. In fact, the first charging coil may also be an upper coil, and the second charging coil is a lower coil.

When the wireless charging device with the charging coil assembly shown in the b diagram in fig. 12 is used for wireless charging, since the arrangement of the charging coils facing opposite directions is adopted, namely the arrangement of the two charging coils facing opposite directions (one is positive and the other is negative), the charging current in the main coil excites the induced current in the main coil in a differential mode with the phase of the original interference current (namely the interference current except the induced current) in the main coil being opposite (namely 180 degrees different), the active control of the induced current in the differential mode is realized, the total amount of the interference current in the main coil is reduced, the interference of the main coil to the charging device 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, 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.

The charging circuit is shown in a c diagram in fig. 12, wherein a first port of one charging coil and a second port of the other charging coil are simultaneously connected with one output node of the full-bridge inverter circuit, and a second port of the one charging coil and a first port of the other charging coil are simultaneously connected with the other output node of the full-bridge inverter circuit. The connection of the first port of the upper coil and the second port of the lower coil to the second output node B and the simultaneous connection of the second port of the upper coil and the second port of the lower coil to the first output node a in fig. 12 are exemplified.

It should be noted that the positive and negative directions of the charging coil mentioned in the embodiments of the present application are relative concepts, and are not absolute. For example, at a fixed moment, the direction of the current on the PCB to the charging coil is fixed, and if the magnetic field generated by this current in the charging coil is directed out of the paper, the charging coil can be defined as being forward; if the magnetic field generated by this current in the charging coil is directed into the paper, the charging coil can be defined as being reversed. Of course, the definition of the front and back can be reversed, the implementation of the technical scheme of the application is not influenced, and the same effect can be achieved.

The influence of the coil assembly shown in the b-diagram of fig. 12 on the power supply in the wireless charging device will be described in detail by actually measured data:

TABLE 1

The two charging coils are reversely arranged, namely, the upper coil and the lower coil are reversely arranged, and the upper coil and the lower coil are reversely arranged. Referring to table 1, it can be seen that the reverse arrangement of the two charging coils has a larger reduction in the voltage of the interference signal scanned by the spectrometer than the same direction arrangement. Most clearly at near 910KHz, when the upper and lower coils are reversed (reverse setup), the voltage of the disturbance signal at 910KHz is 15.13dBuV (decibel microvolts), while when the upper and lower coils are positive (same setup), the voltage of the disturbance signal at 910KHz is 30.79dBuV, differing by as much as 15 dBuV. Meanwhile, at other frequency points, including 1.169MHz and 1.687MHz, the interference signals are reduced to different degrees under the condition that the upper coil is in the positive direction and the lower coil is in the negative direction. Similarly, when the upper and lower coils are inverted (reverse setup), the voltage of the disturbance signal at 910KHz is 3.8dBuV, and when the upper and lower coils are inverted (same direction setup), the voltage of the disturbance signal at 910KHz is 35.24dBuV, which is different by more than 30 dBuV. Meanwhile, at 1.169MHz and 1.687MHz, the interference signal is dropped by more than 13dBuV under the condition that the upper coil is opposite and the lower coil is positive. Compared with the situation of the same direction setting, the situation that the two charging coils are reversely arranged has the interference signal greatly reduced.

In the CE test environment, when two charging coils are set in the same direction, as shown in a graph a in fig. 13, the peak value of the voltage of the interference signal is closer to the peak value limit value, and the average value of the voltage of the interference signal is closer to the average value limit value or even exceeds the standard. See, in particular, the data for peaks in table 2 and the data for averages in table 3:

TABLE 2

Wherein Level represents the magnitude of the measured voltage and Limit represents the Limit value. Margin represents the Margin between measured data and the limit, and it is generally desirable that Margin be smaller and better. 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 average Detector. RBW represents the reference bandwidth. Typically, the comparison of the values is significant based on the same RBW.

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

TABLE 3 Table 3

TABLE 4 Table 4

TABLE 5

As can be seen from comparing the data of tables 2 and 4, the two charging coils are arranged in opposite directions, and the average value of the voltage of the interference signal is reduced by 10dBuV compared with the two charging coils which are arranged in the same direction. As can be seen from comparing the data in tables 3 and 5, the two charging coils are reversely arranged, compared with the two charging coils which are arranged in the same direction, the peak value of the voltage of the interference signal is also reduced to different degrees, especially the interference signal at the original exceeding 910kHz is not exceeding, the interference signal is reduced by more than 9dBuV, and the CE test requirement can be satisfied.

In order to visually check the induced current existing in the secondary coil in the two charging coils which are reversely arranged, an oscilloscope can be adopted to detect the induced current at the secondary coil, so that a waveform chart shown in fig. 14 is obtained.

Meanwhile, it was verified that the use of two charging coils arranged in opposite directions has little influence on the charging efficiency.

A typical wireless charging device may also include three charging coils, such as shown in fig. 15, that overlap to satisfy the charging degrees of freedom. Based on the ideas provided in the present application, the charge coil located in the middle in fig. 15 can be reversed to realize active control reverse compensation of the disturbance signal.

Fig. 15 is a schematic diagram of a charging coil assembly formed by three charging coils according to an embodiment of the present application, and a third charging coil 1203 is further added on the basis of the b diagram in fig. 12. As shown in fig. 16, the third charging coil 1203 and the first charging coil 1201 partially overlap, and the third charging coil 1203 and the second charging coil 1202 do not overlap. When the first charging coil 1201 performs charging, the charging current excites an induced current in the third charging coil 1203. The third charging coil 1203 and the first charging coil 1201 are disposed in reverse, and the third charging coil 1203 and the second charging coil 1202 are disposed in the same direction. The reverse arrangement between the third charging coil 1203 and the first charging coil 1201 causes the induced current in the third charging coil 1203 and the disturbance current in the third charging coil 1203 to be opposite in direction.

On the basis of fig. 16 described above, when the main coil is changed, for example, the second charging coil 1202 operates as the main coil, and the current direction 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 clockwise direction is generated in the first charging coil 1201, and the induced current in the first charging coil 1201 can reduce an originally counterclockwise interference current in the first charging coil 1201. Meanwhile, the counter-clockwise interference current in the first charging coil 1201 may also excite a counter-clockwise induced current in the third charging coil 1203, and the induced current in the third charging coil 1203 may reduce the originally clockwise interference current in the third charging coil 1203. In this way, the disturbance current in the secondary coil is reduced, thereby reducing the disturbance. Similarly, if the third charging coil 1203 is used as the main coil for charging, the disturbance current in the first charging coil 1201 and the second charging coil 1202 as the sub-coils can be reduced, and the effect of reducing the disturbance can be achieved.

The three charging coils in fig. 16 may be sequentially positive, negative, and positive, or alternatively, the three charging coils may be sequentially negative, positive, and negative. The arrangement is the same as the positive, negative and positive technical principles and the implementation effects shown in fig. 16, and will not be described again.

In the charging coil assembly shown in fig. 16, the degree of freedom of charging is improved in the charging coil assembly composed of three charging coils compared with the charging coil assembly composed of two charging coils. Because the arrangement of the charging coils facing opposite directions is adopted, namely, each charging coil in the charging coils is provided with one charging coil which is arranged opposite to the charging coil, when any one charging coil is used as a main coil, the charging current in the main coil excites the induction current of the auxiliary coil which is arranged opposite to the main coil in the auxiliary coil through the mutual inductance of the main coil to the auxiliary coil, the induction current is opposite to the phase of the interference current in the original auxiliary coil (namely, 180 degrees out of phase), so that the interference current can be counteracted, the active control of the induction current in a 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 a charging device is reduced, and then in CE test and actual charging scenes, the interference current which flows back to a power supply is correspondingly reduced, the quality of the power supply can be improved, and the performance and the safety of electric equipment using the power supply are ensured.

Fig. 18 is a schematic diagram of a charging coil assembly formed by four charging coils according to an embodiment of the present application, and a fourth charging coil 1204 is further added on the basis of fig. 16. As shown in fig. 18, the fourth charging coil 1204 and the second charging coil 1202 partially overlap, and the fourth charging coil 1204 does not overlap with the first charging coil 1201 and the third charging coil 1203. The current in the second charging coil 1202 (the disturbance current or the charging current) induces an induced current in the fourth charging coil 1204; the fourth charging coil 1204 and the second charging coil 1202 are arranged in opposite directions, and the opposite directions between the fourth charging coil 1204 and the second charging coil 1202 are arranged such that the induced current in the fourth charging coil 1204 and the disturbance current in the fourth charging coil 1204 are opposite in direction. I.e. the four charging coils are oriented in a forward, reverse, forward and reverse order.

And compared with a charging coil assembly consisting of two charging coils and three charging coils, the charging coil assembly consisting of four charging coils has the advantage that the charging freedom degree is improved. Because the arrangement of the charging coils facing opposite directions is adopted, namely, each charging coil in the charging coils is provided with the charging coil which is arranged opposite to the charging coil, when any one charging coil is used as the main coil, the charging current in the main coil excites the induction current of the auxiliary coil which is arranged opposite to the main coil in the auxiliary coil through the mutual inductance of the main coil to the auxiliary coils, the induction current is opposite to the phase of the interference current in the original auxiliary coil (namely, 180 degrees out of phase), so that the interference current can be counteracted, the active control of the induction current in the differential mode is realized, the total amount of the interference current in the auxiliary coils is reduced through the reverse compensation of the interference current, the interference of the auxiliary coils to the charging equipment is reduced, and then in CE test and actual charging scenes, the interference current which flows back to the power supply is correspondingly reduced, the quality of the power supply can be improved, and the performance and the safety of electric equipment using the power supply are ensured.

In the embodiment shown in fig. 18, no matter which charging coil is used as the main coil to charge, at least one secondary coil which is reversely arranged is partially overlapped with the primary coil, so that the charging current can excite the secondary coil overlapped with the primary coil to generate induced current, thereby counteracting the original interference current, realizing the scheme of reverse compensation of active control and reducing interference. The implementation principle and technical effect in this embodiment may be referred to the b-chart in fig. 12, the related descriptions in fig. 16 and fig. 17, and will not be repeated here.

In some embodiments, when the number of the charging coils is greater than or equal to 3, an auxiliary coil which is "always" can be specially set as a descrambling coil, and mutual inductance between the auxiliary coil and the auxiliary coil is adopted to counteract interference signals. Especially when the number of the charging coils is more than four, it is difficult to ensure the reverse arrangement between every two charging coils by selecting the charging coils for reverse arrangement, so that a special descrambling coil can be adopted to counteract the interference signals in the auxiliary coils.

As shown in fig. 19, fig. 19 illustrates the presence of three charging coils disposed in the same direction, and the descrambling coil 1901 and the three charging coils disposed in the opposite direction. For example, the descrambling coil 1901 may be set to reverse, and the interfering current in the descrambling coil 1901 may excite the induced current in the charging coils 1902, 1903, and 1904. When the charging coil 1901 is charged as the main coil, there is also an interference current in the descrambling coils 1902, 1903, and 1904 as the sub-coils. Since the descrambling coil 1901 is disposed opposite to the charging coil 1902, the charging coil 1903, and the charging coil 1904, respectively, the induced current excited in the charging coil 1902 by the disturbing current in the descrambling coil 1901 can cancel the disturbing current in the charging coil 1902, and likewise, the induced current excited in the charging coil 1903 by the disturbing current in the descrambling coil 1901 can cancel the disturbing current in the charging coil 1903, and the induced current excited in the charging coil 1904 by the disturbing current in the descrambling coil 1901 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, increased or decreased. For example, the descrambling coil 1901 may be elliptical as shown in a diagram in fig. 19, may be circular with a larger size as shown in b diagram in fig. 19, may be circular with a smaller size as shown in c diagram in fig. 19, may be square with a smaller size as shown in d diagram in fig. 19, may be square with a larger size as shown in e diagram in fig. 19, may be triangular as shown in f diagram in fig. 19, and the like, which are not illustrated here. If a portion where the descrambling coils 1901 and each charging coil are overlapped is ensured, the disturbing current in the descrambling coils 1901 can excite the induced current in other charging coils, and the induced current excited in each charging coil can reduce the original disturbing current, so that the anti-jamming effect of active control and reverse compensation is realized.

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

Alternatively, the charging coil in the embodiment of the present application is mostly shown as a circular charging coil, in fact, the shape of the charging coil may be other shapes, such as oval, rectangle, square, rounded long direction, square, etc., or may be a combination of charging coils with different shapes, such as circular, oval, etc., which is not limited to the embodiment of the present application.

In some embodiments, two ends of the descrambling coil 1901 may be respectively connected to a MOS transistor, where a body diode in the MOS transistor can control the descrambling coil to be in a suspension state and not be used as a main coil for charging.

The a-diagram, the b-diagram, the c-diagram and the d-diagram in fig. 21 are all exemplified by 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 the size of the descrambling coil 1901 can be unlimited, and the descrambling coil 1901 has a heavy portion 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. The interference current will be present in the de-interference coil 1901 itself, which can excite an induced current in the same direction (clockwise or counter-clockwise) in the other non-operating charging coils. Because the interference current except the induction current exists in each non-working charging coil, and the direction of the induced current excited in the non-working charging coil is opposite to that of the interference current, the induced current can reduce the original interference current, thereby reducing interference signals and realizing the anti-interference effects of active control and reverse compensation.

In some embodiments, having the descrambling coil 1901 and the charging coil disposed in reverse may be flipping the descrambling coil 180 degrees; all the charging coils can be turned over 180 degrees; it is also possible to change the first port of the descrambling coil 1901 from the first output node a originally connected to the full-bridge inverter circuit to the second output node B connected to 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 the embodiment of the present application, as long as it can overlap any one of the plurality of charging coils. Alternatively, the overlapping may be partial overlapping or full overlapping, which is not limited. In this way, the interference eliminating coil 1901 can generate mutual inductance with other charging coils, and the interference signals in the interference eliminating coil 1901 generate induced currents in other auxiliary coils, so that the interference signals in other auxiliary coils are eliminated.

As the number of charging coils continues to increase, for example five, six, eight, nine, twelve, fifteen or more, interfering signals in other secondary coils can be cancelled by the reverse arrangement of the de-scrambling coils and other charging coils. In this embodiment, the charging coil assemblies formed by other numbers of charging coils are not listed one by one.

In some embodiments, the area of the non-overlapping region between the coverage area of the descrambling coils and the charging areas covered by all charging coils is less than a preset area difference threshold. I.e. the coverage area of the descrambling coil is higher than the charging area covered by all other charging coils, e.g. the non-overlapping area between the two is smaller than a certain preset area difference threshold. The preset area threshold may be sized as desired. Optionally, the coverage area of the descrambling coil and the external contours of the charging coils can be completely overlapped, so that the mutual inductance between the descrambling coil and the charging coils can be ensured to the greatest extent, and interference signals can be counteracted to the greatest extent; and the coverage area of the descrambling coils is overlapped with the external outlines of the plurality of charging coils, so that the size of the descrambling coils does not exceed the charging area covered by the plurality of charging coils, and therefore, the area outside the charging area of the plurality of charging coils is not occupied, and the size of the wireless charging device is not increased.

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 smaller than the preset area difference threshold, the phenomenon that the mutual inductance caused by the low overlapping degree of the coverage area of the descrambling coil and the charging area covered by all other charging coils is too weak, the generated induced current is too weak, the offset of the interference current is too low, and the interference removal effect is influenced can be avoided. Therefore, the interference elimination coil can be ensured to have enough mutual inductance to generate stronger induction current at each charging coil, and the offset of the interference current is larger, so that the interference elimination effect is 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 one charging pad. The plurality of charging coils are arranged on the ferrite, and then the charging circuit is connected to realize wireless charging. In fig. 22, a diagram is shown by way of example with 18 charging coils, which 18 are attached to ferrite to ensure the quality factor of the electromagnetic conversion. For such a plurality of charging coil assemblies, a large de-scrambling coil 1901 may be used as an always secondary coil, and as shown in b diagram in fig. 22, the effect of de-scrambling other secondary coils may be achieved.

The embodiment of the application also provides a wireless charging device, which comprises one or more charging coil assemblies in the embodiment. Each charging coil assembly can wirelessly charge one device to be charged. When the wireless charging device includes a plurality of charging coil assemblies in the foregoing embodiments, a plurality of devices to be charged may be charged simultaneously by wireless charging, where each charging coil assembly selects one charging coil 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 with a wireless charging function and a smart watch in different areas of the wireless charging plate, the wireless charging plate can simultaneously perform wireless charging on the plurality of electronic devices.

Optionally, multiple charging coil assemblies in the wireless charging device may also share the same descrambling coil. The charging coils in the plurality of charging coil assemblies are all arranged in the same direction, and the descrambling coils and the charging coils are arranged in opposite directions. When each charging coil assembly charges a device to be charged, the descrambling coils can excite induced currents in the auxiliary coils which are not in a charging state, so that interference signals are counteracted. The plurality of charging coil assemblies share the same descrambling coil, so that the complexity of the structure of the wireless charging device can be reduced, and the wireless charging device is convenient to produce and manufacture.

The implementation principle and technical effect of the wireless charging device can be referred to the related description of the charging coil assembly, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with respect to each other may be an indirect coupling or communication connection via interfaces, devices, or units, and the replacement units may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read Only Memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely 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 think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to 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: a first charging coil and a second charging coil, the first charging coil and the second charging coil partially overlapping, the second charging coil not being charged when the first charging coil is charged, a charging current being generated in the first charging coil that is charged, a first disturbing signal being generated in the second charging coil that is not charged, the first disturbing signal including a first induced current in the second charging coil that is induced by the charging current generated in the first charging coil, and a first disturbing current in the second charging coil that is generated due to a disturbance other than the first induced current;

the first induced current in the second charging coil and the first disturbance current in the second charging coil are in opposite directions.

2. The charging coil assembly of claim 1, applied to a wireless charging device comprising a full-bridge inverter circuit comprising a first output node and a second output node, wherein the ports of the first charging coil and the second charging coil are set identically, a first port of the first charging coil is connected with the first output node, a second port of the first charging coil is connected with the second output node, a first port of the second charging coil is connected with the second output node, and a 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, a first direction of the first charging coil being opposite a second direction of the second charging coil such that the first induced current in the second charging coil and the first disturbance current in the second charging coil are opposite directions, the first direction being a direction from a first port of the first charging coil pointing in a winding direction of the first charging coil toward a second port of the first charging coil, the second direction being a direction from a first port of the second charging coil pointing in a winding direction of the second charging coil toward a second port of the second charging coil;

Wherein the first direction is clockwise and the second direction is counterclockwise; alternatively, the first direction is a counterclockwise direction and the second direction is a clockwise direction.

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

5. The charging coil assembly of any one of claims 1 to 4, further comprising a third charging coil, the third charging coil and the first charging coil being partially coincident, the third charging coil not being charged, a second interference signal being generated in the third charging coil that is not charged, the second interference signal comprising the charging current in the first charging coil inducing a second induced current in the third charging coil, and a second interference current in the third charging coil due to interference in addition to the second induced current;

The second induced current in the third charging coil and the second disturbance current in the third charging coil are in opposite directions.

6. The charging coil assembly of claim 5, wherein the port settings of the first and third charging coils are the same, the first direction of the first charging coil being opposite to the third direction of the third charging coil such that the second induced current in the third charging coil and the second disturbance current in the third charging coil are opposite in direction, the first direction being a direction from the first port of the first charging coil to the second port of the first charging coil in a winding direction of the first charging coil, the third direction being a direction from the first port of the third charging coil to the second port of the third charging coil in a winding direction of the third charging coil;

wherein the first direction is clockwise and the third direction is counterclockwise; alternatively, the first direction is a counterclockwise direction and the third direction is a clockwise direction.

7. The charging coil assembly of claim 5 or 6, further comprising a fourth charging coil, the fourth charging coil and the second charging coil partially coinciding, the fourth charging coil not coinciding with both the first charging coil and the third charging coil, the fourth charging coil not being charged, a third interference signal being generated in the fourth charging coil that is not charged, the third interference signal comprising a third induced current in the fourth charging coil that is induced by the first interference current in the second charging coil, and a third interference current in the fourth charging coil that is due to interference other than the third induced current;

The third induced current in the fourth charging coil and the third disturbance current in the fourth charging coil are in opposite directions.

8. The charging coil assembly of claim 7, wherein the port settings of the second charging coil and the fourth charging coil are the same, the second direction of the second charging coil being opposite the fourth direction of the fourth charging coil such that the third induced current in the fourth charging coil and the third disturbance current in the fourth charging coil are in opposite directions, the second direction being a direction from the first port of the second charging coil to the second port of the second charging coil in a winding direction of the second charging coil, the fourth direction being a direction from the first port of the fourth charging coil to the second port of the fourth charging coil in a winding direction of the fourth charging coil;

wherein the second direction is clockwise and the fourth direction is counterclockwise; alternatively, the second direction is a counterclockwise direction and the fourth direction is a clockwise direction.

9. A charging coil assembly, comprising: a first charging coil and a second charging coil, the first charging coil and the second charging coil partially overlapping, the second charging coil not being charged when the first charging coil is charged, a charging current being generated in the first charging coil being charged, an interference signal being generated in the second charging coil not being charged, the interference signal including a first induced current induced in the second charging coil by the charging current generated in the first charging coil, and a first interference current being generated in the second charging coil due to interference other than the first induced current;

The ports of the first charging coil and the second charging coil are arranged identically, and the first direction of the first charging coil is opposite to the second direction of the second charging coil, so that the first induced current in the second charging coil and the first interference current in the second charging coil are opposite in direction; the first direction is a direction from a first port of the first charging coil to a second port of the first charging coil along a winding direction of the first charging coil, and the second direction is a direction from a first port of the second charging coil to a second port of the second charging coil along a winding direction of the second charging coil;

10. A wireless charging device comprising N charging coil assemblies according to any one of claims 1 to 9, wherein N is a positive integer.

11. The wireless charging device of claim 10, wherein N is a positive integer greater than 1, the wireless charging device being a wireless charging pad.