The invention relates to the technical field of
wireless charging, in particular to a multi-coil
wireless charging
system having a
metal object detecting function. The multi-coil
wireless charging
system comprises a power emission unit, a power receiving unit and a
metal detecting device, wherein the power emission unit is used for
electric energy emission and high-frequency resonant
magnetic field production of the charging
system, the power receiving unit is used for receiving energy emitted by the power emission unit and rectifying the energy into constant
direct current for power supply of a battery, the
metal detecting device comprises a metal detecting coil and a metal detecting circuit, the metal detecting coil is mutually coupled with an emitting coil and a receiving coil, and the metal detecting coil and the metal detecting circuit for a loop for detecting whether metal
foreign matter exists in a
magnetic field or not. The emitting coil is of a multi-
coil array structure, the multi-coil wireless charging system is suitable for different electronic devices, has strong universality and is high in charging efficiency. The emitting coil serves as an energy emitting unit of the whole charging system and also establishes the high-frequency
magnetic field for the metal detecting device, and the wireless charging system and a balancing metal
foreign matter detecting technology are perfectly fused.