Apparatus and method for controlling power transmission coverage of wireless power transmission network

An apparatus, comprising:

• a wireless power transmitter configured to transmit wireless power to a plurality of peripheral devices in a power transfer coverage of a wireless power transmission network;
• and
• a controller to:
• gradually decrease transmission power of the wireless power transmitter,
• determine a value PD representing an amount of power at which one of the plurality of peripheral devices is first to disconnect from the wireless power transmission network while gradually decreasing the transmission power, and
• set the transmission power of the wireless power transmitter to a transmission power value based, at least in part, on an offset amount above the value PD.

A system for wireless power transfer, comprising:

• means for transmitting wireless power to a plurality of peripheral devices in a power transfer coverage of a wireless power transmission network;
• means for gradually decreasing transmission power of the wireless power transmitter;
• means for determining a value PD representing an amount of power at which one of the plurality of peripheral devices is first to disconnect from the wireless power transmission network while gradually decreasing the transmission power;
• and
• means for setting the transmission power of the wireless power transmitter to a transmission power value based, at least in part, on an offset amount above the value PD.