Method and apparatus for controlling wireless power transmission

A computer program product embodied on a non-transitory computer readable medium storing instructions that when executed, perform the following instructions:

• entering a negotiation phase with a power receiver including receiving a foreign object detection status packet including at least one of a reference quality factor and a reference quality factor peak frequency from the power receiver, detecting whether a foreign object is present based on the foreign object detection status packet, and transmitting a NACK response to the power receiver indicating the power transmitter has detected the foreign object is present or transmitting an ACK response to the power receiver indicating the power transmitter has detected the foreign object is not present;
• and
• entering a power transfer phase including transmitting a first power to the power receiver in response to the transmitted NACK response and again detecting whether the foreign object is present while transmitting the first power, and transmitting a second power greater than the first power in response to the transmitted ACK response.