Wireless charging device, alignment method, system, and charging base

1 . A wireless charging device, wherein the wireless charging device is configured to perform wireless charging on an electronic device, and comprises a resonant network, an inverter circuit, a controller, and an alignment mechanism, wherein:

the resonant network comprises a resonant capacitor and a transmitting coil;

one end of the resonant network connects to the inverter circuit, the other end of the resonant network connects to the controller;

the controller is configured to select a moving direction of the transmitting coil based on a self-inductance of the transmitting coil or a resonant frequency of the resonant network, and control a movement of the transmitting coil based on the moving direction of the transmitting coil, to enable the wireless charging device to align with the electronic device, wherein the self-inductance of the transmitting coil increases along the moving direction of the transmitting coil, and the resonant frequency decreases along the moving direction of the transmitting coil; and

the controller is further configured to control, based on the moving direction of the transmitting coil, the alignment mechanism to drive the transmitting coil to move along the moving direction,

wherein the alignment mechanism comprises at least an electric drive member, a first guide rail, and a second guide rail, the first guide rail and the second guide rail are perpendicular to each other, the electric drive member is configured to drive the transmitting coil to move along the first guide rail and the second guide rail, the controller is configured to control the electric drive member to enable the transmitting coil to move along the moving direction,

wherein the controller is configured to control the transmitting coil to move through a closed path around a center with an initial position as the center, to obtain a direction in which the self-inductance of the transmitting coil is the greatest in a movement process of the transmitting coil, and the direction in which the self-inductance of the transmitting coil is the greatest is the moving direction.

2 . The wireless charging device according to claim 1 , wherein the controller is configured to: when the wireless charging device is at least in a non-communicable area, determine the moving direction of the transmitting coil based on the self-inductance of the transmitting coil or the resonant frequency of the resonant network.

3 . The wireless charging device according to claim 2 , wherein the controller is configured to: in a non-communicable area, determine the moving direction based on the self-inductance of the transmitting coil or the resonant frequency of the resonant network; and the controller is further configured to: when the wireless charging device and the electronic device are in a communicable area, determine the moving direction based on a charging parameter, wherein the charging parameter monotonically changes along the moving direction based on the charging parameter.

4 . The wireless charging device according to claim 3 , wherein:

the charging parameter monotonically increases with the movement along the moving direction based on at least one of the following:

the self-inductance of the transmitting coil, a charging frequency, charging efficiency, an output voltage of a rectifier circuit in the electronic device, a product of the self-inductance of the transmitting coil and an alternating current resistance of the transmitting coil, a mutual inductance between the transmitting coil and a receiving coil, a coupling coefficient between the transmitting coil and the receiving coil, a mutual inductance between the transmitting coil and an auxiliary coil, a coupling coefficient between the transmitting coil and the auxiliary coil, or an open-circuit voltage of an auxiliary coil in the electronic device; or

the charging parameter monotonically decreases with the movement along the moving direction based on at least one of the following:

a current of the transmitting coil and an input voltage of the inverter circuit.

5 . The wireless charging device according to claim 2 , wherein the controller is further configured to: when no data packet sent by the electronic device is received, and the self-inductance of the transmitting coil is greater than a preset threshold, determine that the wireless charging device and the electronic device are in a non-communicable area.

6 . The wireless charging device according to claim 1 , wherein the controller is configured to control the transmitting coil to move along a circle of a preset radius with the initial position as the center, to obtain the direction in which the self-inductance of the transmitting coil is the greatest in a process that the transmitting coil moves on the circumference.

7 . The wireless charging device according to claim 1 , wherein the controller is configured to: control the transmitting coil to move around a starting point separately to a first point and a second point with an initial position as the starting point, wherein the starting point, the first point, and the second point form a triangle; and determine the moving direction based on a self-inductance of the transmitting coil corresponding to each of the first point and the second point.

8 . The wireless charging device according to claim 7 , wherein the starting point is a common vertex of two right-angled sides of a right triangle, and the first point and the second point are other two vertices of the two right-angled sides respectively.

9 . The wireless charging device according to claim 1 , wherein the controller is further configured to obtain the self-inductance of the transmitting coil based on the resonant frequency of the resonant network and the resonant capacitor of the resonant network.

10 . A wireless charging system, comprising a wireless charging device, and further comprising an electronic device, wherein

the electronic device comprises a receiving coil and a rectifier circuit; and

the wireless charging device is configured to perform wireless charging on the electronic device;

wherein the wireless charging device comprises a resonant network, an inverter circuit, a controller, and an alignment mechanism, wherein

the resonant network comprises a resonant capacitor and a transmitting coil;

one end of the resonant network connects to the inverter circuit, the other end of the resonant network connects to the controller;

the controller is configured to select a moving direction of the transmitting coil based on a self-inductance of the transmitting coil or a resonant frequency of the resonant network, and control a movement of the transmitting coil based on the moving direction of the transmitting coil, to enable the wireless charging device to align with the electronic device, wherein the self-inductance of the transmitting coil increases along the moving direction of the transmitting coil, and the resonant frequency decreases along the moving direction of the transmitting coil; and

the controller is further configured to control, based on the moving direction of the transmitting coil, the alignment mechanism to drive the transmitting coil to move along the moving direction,

wherein the alignment mechanism comprises at least an electric drive member, a first guide rail, and a second guide rail, the first guide rail and the second guide rail are perpendicular to each other, the electric drive member is configured to drive the transmitting coil to move along the first guide rail and the second guide rail, the controller is configured to control the electric drive member to enable the transmitting coil to move along the moving direction,

wherein the controller is configured to control the transmitting coil to move through a closed path around a center with an initial position as the center, to obtain a direction in which the self-inductance of the transmitting coil is the greatest in a movement process of the transmitting coil, and the direction in which the self-inductance of the transmitting coil is the greatest is the moving direction.

11 . The wireless charging system according to claim 10 , wherein the controller is configured to: when the wireless charging device is at least in a non-communicable area, determine the moving direction of the transmitting coil based on the self-inductance of the transmitting coil or the resonant frequency of the resonant network.

12 . The wireless charging system according to claim 10 , wherein the closed path comprises a circle.

13 . A wireless charging base, configured to perform wireless charging on an electronic device, comprising: a power interface, a resonant network, an inverter circuit, a controller, a transmitting coil chassis, and an alignment guide rail, wherein

the power interface is configured to connect a direct current transmitted by an adapter;

the resonant network comprises a resonant capacitor and a transmitting coil;

the transmitting coil chassis is configured to place the transmitting coil;

one end of the resonant network connects to the inverter circuit, the other end of the resonant network connects to the controller; and

the controller is configured to select a moving direction of the transmitting coil based on a self-inductance of the transmitting coil or a resonant frequency of the resonant network, and control, based on the moving direction of the transmitting coil, the transmitting coil chassis to move on the alignment guide rail, to enable the wireless charging device to align with the electronic device, wherein the self-inductance of the transmitting coil increases along the moving direction of the transmitting coil, and the resonant frequency decreases along the moving direction of the transmitting coil;

wherein the alignment guide rail comprises at least a first guide rail and a second guide rail whose projections on a horizontal plane are perpendicular to each other and further comprises an electric drive member;

the electric drive member is configured to drive the transmitting coil to move along the first guide rail and the second guide rail; and

the controller is configured to control the electric drive member, to enable the transmitting coil to move along the moving direction,

wherein the controller is configured to control the transmitting coil to move through a closed path around a center with an initial position as the center, to obtain a direction in which the self-inductance of the transmitting coil is the greatest in a movement process of the transmitting coil, and the direction in which the self-inductance of the transmitting coil is the greatest is the moving direction.

14 . The wireless charging base according to claim 13 , wherein the wireless charging base is disk-shaped and the transmitting coil is disk-shaped.

15 . The wireless charging base according to claim 13 , wherein the closed path comprises a circle.