Apparatus and method for detecting foreign object in wireless power transmitting system

A method of detecting one or more foreign objects using a wireless power transmitting apparatus equipped with a primary core block, the method comprising:

• applying an alternating current (AC) signal required for transmitting wireless power to the primary core block;
• transmitting a power signal to a wireless power receiving apparatus;
• checking whether an initial voltage of an output terminal of the wireless power receiving apparatus connected to an external load is within a range of a reference voltage;
• measuring an initial transmission power transmitted from the primary core block;
• and
• performing a foreign object detection on the basis of the initial transmission power.

A wireless power receiving apparatus detecting a foreign object, comprising:

• a secondary core block coupled with a primary core block equipped in a wireless power transmitting apparatus through magnetic induction or magnetic resonance and receiving wireless power from the wireless power transmitting apparatus by the magnetic induction or the magnetic resonance;
• a rectification unit connected to the secondary core block and configured for providing power to a control unit and an external load by performing full-wave rectification on an alternating current (AC) waveform generated from the secondary core block;
• and
• a control unit configured for measuring an initial voltage of an output terminal connected to the external load and controlling the wireless power receiving apparatus to enter a foreign object detection phase if the initial voltage belongs to a range of a reference voltage.

A method of detecting one or more foreign objects using a wireless power receiving apparatus equipped with a secondary core block, the method comprising:

• receiving a power signal from a wireless power transmitting apparatus;
• performing full-wave rectification on an alternating current (AC) waveform generated from the secondary core block;
• measuring an initial voltage of an output terminal connected to an external load of the wireless power receiving apparatus;
• and
• controlling the wireless power receiving apparatus to enter a foreign object detection phase if the initial voltage is within a range of a reference voltage.