关键词: 无线充电；低成本；异物检测；Qi协议传输

Abstract: With the continuous updata of smart phones, the power consumption of devices is getting larger and larger, and the charging frequency is also increasing gradually. Traditional chargers and wires restrict the charging, which provides an opportunity for the development of wireless charging technology. This paper mainly introduces the principle of the wireless charging system and the basic structure of the system, and selects and studies the wireless charging scheme based on Qi protocol according to the project requirements. Finally, the system which is Based on the lowcost MCU, implements the functions of FOD and Qi protocol transmission and the realizes lowcost application of 5 W wireless charging.

Key words: wireless charging; inexpensive; FOD; Qi protocol transmission