Patent ID: 7450910

Claim:
A power supply system capable of supplying power from a power transmitter to a power receiver in an electrically non-contact manner, comprising: a power transmission module attached to the power transmitter; and a power reception module attached to the power receiver, wherein the power transmission module includes a plurality of transmission-side coils for transmitting power, a plurality of transmission-side switches for turning on/off operation of the transmission-side coils, respectively, and a transmission-side switch change-over circuit for selectively turning on one of the transmission-side switches, the power reception module includes: one or more reception-side coils configured to receive power, one or more reception-side switches configured to turn on/off operation of the one or more reception-side coils, respectively, a memory configured to record a value of power energy received by the one or more reception-side coils, and a determination circuit configured to output an instruction signal to operate any of the transmission-side coils and any of the reception-side coils in combination realizing a highest power transmission efficiency on a basis of the value of power energy recorded on the memory, and wherein the instruction signal is transmitted to the transmission-side switch change-over circuit and, according to the instruction signal, the one or more reception-side switches are configured to turn on/off operation of the one or more reception-side coils.