This disclosure relates to a power efficient wireless power receiver that is configured to receive and convert wireless power to direct-current (DC) power with minimal wastage. In particular, the receiver is able to selectively switch between a DC power combining topology and a radio-frequency (RF) power combining topology based on the amount of power that has been received so that the maximum amount of power received is optimized.

A synchronization system includes a master unit and a slave unit. The slave unit is connected to the master unit directly, or indirectly via another slave unit, and is connected to at least one power supply device. The master unit transmits, to master downstream equipment, a first adjusted signal advanced in phase relative to a reference phase by a time corresponding to a time required to transmit a synchronization signal from the master unit to the master downstream equipment. The slave unit transmits, to slave downstream equipment, a second adjusted signal advanced in phase relative to a phase of the synchronization signal received from slave upstream equipment by a time corresponding to a sum of a time required to transmit the synchronization signal from the slave unit to the slave downstream equipment, and a processing time of the synchronization signal inside the slave unit.

A synchronization system includes a master unit and a slave unit. The slave unit is connected to the master unit directly, or indirectly via another slave unit, and is connected to at least one power supply device. The master unit transmits, to master downstream equipment, a first adjusted signal advanced in phase relative to a reference phase by a time corresponding to a time required to transmit a synchronization signal from the master unit to the master downstream equipment. The slave unit transmits, to slave downstream equipment, a second adjusted signal advanced in phase relative to a phase of the synchronization signal received from slave upstream equipment by a time corresponding to a sum of a time required to transmit the synchronization signal from the slave unit to the slave downstream equipment, and a processing time of the synchronization signal inside the slave unit.

A wireless charging coil member and a wireless charging coil assembly. The wireless charging coil member comprises a first coil member, a second coil member, and a side coil member. The first coil member comprises a first coil and a first magnetic core. The first coil is winding around the first magnetic core in a first direction. The second coil member comprises a second coil and a second magnetic core. The second coil is winding around the second magnetic core in the first direction. The first coil member is disposed at one side of the second coil member. The side coil member comprises a side coil and a side magnetic core. The side coil is winding around the side magnetic core in a second direction. The second direction is perpendicular to the first direction. The side coil member is disposed between the first coil member and the second coil member.

A wireless charging coil member and a wireless charging coil assembly. The wireless charging coil member comprises a first coil member, a second coil member, and a side coil member. The first coil member comprises a first coil and a first magnetic core. The first coil is winding around the first magnetic core in a first direction. The second coil member comprises a second coil and a second magnetic core. The second coil is winding around the second magnetic core in the first direction. The first coil member is disposed at one side of the second coil member. The side coil member comprises a side coil and a side magnetic core. The side coil is winding around the side magnetic core in a second direction. The second direction is perpendicular to the first direction. The side coil member is disposed between the first coil member and the second coil member.

A wireless charging reception circuit, a method, electronic device and a wireless charging system are described. In the wireless charging reception circuit, a control circuit may control a rectifying circuit to rectify electric signals transmitted by a first resonance circuit and/or a second resonance circuit. Since the rectifying circuit outputs different voltages after rectifying the electric signals transmitted by the different resonance circuits, the control circuit may controls the rectifying circuit to rectify the electric signals transmitted by the different resonance circuits to adjust the output voltages of the rectifying circuit.

Foreign object detection for wireless power transmission and related systems, methods, and devices are disclosed. A controller for a wireless power transmitter is to determine a transmit coil voltage potential at a transmit coil of the wireless power transmitter, determine an input power provided to the wireless power transmitter, determine a transmitter power loss, and determine a transmitted power of the wireless power transmitted to the wireless power receiver based, at least in part, on the input power and the transmitter power loss. The controller is also to compute a power loss responsive to the transmitted power and a received power indicated by the wireless power receiver, and determine that a foreign object is detected responsive to a determination that the power loss is greater than a predetermined threshold.

Foreign object detection for wireless power transmission and related systems, methods, and devices are disclosed. A controller for a wireless power transmitter is to determine a transmit coil voltage potential at a transmit coil of the wireless power transmitter, determine an input power provided to the wireless power transmitter, determine a transmitter power loss, and determine a transmitted power of the wireless power transmitted to the wireless power receiver based, at least in part, on the input power and the transmitter power loss. The controller is also to compute a power loss responsive to the transmitted power and a received power indicated by the wireless power receiver, and determine that a foreign object is detected responsive to a determination that the power loss is greater than a predetermined threshold.

Wireless power transfer (WPT) efficiency is enhanced using an ultra-low power (ULP) distributed beamforming technique. A phase and frequency offset correction technique is used for beam-forming optimization, a backscattering communication technique is used to reduce power over-head, and a new rectifier and MPT method is used for high efficiency RF-to-DC conversion.

Wireless power transfer (WPT) efficiency is enhanced using an ultra-low power (ULP) distributed beamforming technique. A phase and frequency offset correction technique is used for beam-forming optimization, a backscattering communication technique is used to reduce power over-head, and a new rectifier and MPT method is used for high efficiency RF-to-DC conversion.