Foreign object detection based on transmitter input parameter

An apparatus comprising:

• an integrated circuit configured to:
• detect an object inductively coupled to a wireless power transmitter;
• prior to a power transfer stage between the wireless power transmitter and a wireless power receiver, measure an input parameter, the input parameter being one of an input current and an input power,
• compare the measured input parameter with a predetermined value;
• and
• determine whether the object is a foreign object or the wireless power receiver based on a result of the comparison between the measured input parameter with the predetermined value.

A method for operating a wireless power transmitter, the method comprising:

• detecting, by an integrated circuit, an object inductively coupled to a wireless power transmitter;
• prior to a power transfer stage between the wireless power transmitter and a wireless power receiver, measuring, by the integrated circuit, an input parameter, the input parameter being one of an input current and an input power;
• comparing, by the integrated circuit, the measured input parameter with a predetermined value;
• and
• determining, by the integrated circuit, whether the object is a foreign object or the wireless power receiver based on a result of the comparison between the measured input parameter with the predetermined value.