A power supply system capable of supplying power from a power transmitter
to a power receiver in an electrically non-contact manner, in which a
power transmission module is attached to the power transmitter and a
power reception module is attached to the power receiver. The power
transmission module has a plurality of transmission-side coils for
transmitting power and a plurality of transmission-side switches for
turning on/off operation of the transmission-side coils. The power
reception module has a plurality of reception-side coils for receiving
power, a plurality of reception-side switches for turning on/off
operation of the reception-side coils and, further, has a determination
circuit for performing control so as to operate any of the
transmission-side coils and any of the reception-side coils in a
combination realizing highest power transmission efficiency.