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

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.

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.