Method and device for detecting foreign matter, household appliance and air conditioning system

A device for detecting whether a foreign matter is present within a wireless power transmission system, the device comprising:

• a transmission adjustment module configured to control a transmitting detection coil of a transmitting end of the wireless power transmission system to send electric energy to a receiving end of the wireless power transmission system and determine a transmitting power of the transmitting end;
• a power acquisition module configured to obtain a receiving power received by the receiving end;
• and
• a foreign matter detection module configured to:
• determine a power difference between the transmitting power and the receiving power;
• and
• determine whether the foreign matter is present based on whether the power difference surpasses a threshold.

A method for detecting whether a foreign matter is present within a wireless power transmission system, the method comprising:

• receiving, via a receiving detection coil of a receiving end of the wireless power transmission system, energy from a transmitting end of the wireless power transmission system, wherein a mutual inductance between the receiving detection coil and the transmitting end is greater than a mutual inductance between a receiving work coil of the receiving end and the transmitting end;
• determining a receiving power received by the receiving detection coil;
• determining a transmitting power of the energy provided by the transmitting end sends the electric energy;
• determining a power difference between the transmitting power and the receiving power;
• and
• determining whether the foreign matter is present based on whether the power difference surpasses a threshold.