Wireless power transmission and charging system, and impedance control method thereof

摘要

A wireless power transmission and charging system and method are provided. The wireless power may refer to energy that may be transferred from a wireless power transmitter to a wireless power receiver. The wireless power transmission and charging system may include a source device to wirelessly transmit power, and a target device to wirelessly receive power.

主权项

1. An impedance control method of a wireless power transmitter configured to transmit power to at least one target device, the method comprising:
generating power for charging by determining an impedance of a source resonator, and a signal level of a direct current (DC) voltage to be supplied to a power amplifier; transmitting the charging power to the at least one target device through magnetic coupling; assigning at least one virtual identifier to the at least one target device; receiving at least one ACK message comprising the at least one virtual identifier from the at least one target device; determining a number NT of the at least one target device based on the received at least one ACK message; and adjusting the impedance of the source resonator based on the determined number NT of the at least one target device.