Wireless power transmission apparatus and method of transmitting wireless power using the same

A method of transmitting wireless power, comprising:

• (a) inputting, under control, distributed power signals to a switching block having a plurality of switches, and transmitting the power signals as periodical preamble signals on detour paths that make a detour around power amplification paths;
• (b) detecting the preamble signals that are delivered to a coil array block having transmission coils for wireless power transmission through the detour paths, and sensing changes in preamble signals in accordance with whether wireless power receiving apparatuses receiving the wireless power from the coil array block appear;
• (c) controlling the switching block on the paths where wireless power receiving apparatuses appear, in accordance with the changes in sensed preamble signals, transmitting the power signals input to the switching block to the power amplification paths, amplifying the power signals on the power amplification paths, and transmitting the amplified power signals to the coil array block;
• and
• (d) performing, by the coil array block, wireless power transmission.

The method of 15, wherein (c1) includes:

• with respect to the paths switched to the wireless power transmission mode,
• (c1-a) inputting the distributed power signals to the switching block having the switches and transmitting the power signals to the power amplification paths in accordance with switching to the wireless power transmission mode;
• (c1-b) detecting the power signals delivered to the coil array block having the transmission coils through the power amplification paths, and sensing the changes in power signals in accordance with the reception state of the wireless power receiving apparatuses receiving the wireless power from the coil array block on the corresponding paths;
• and
• (c1-c) determining the charge progress state of the wireless power receiving apparatuses on the corresponding paths in accordance with the changes in sensed power signals, and switching to the sleep mode by turning off the switches for power input of the switching block on the corresponding paths and the bias power source for power amplification on the power amplification paths at the time of charge completion.