Power receiver and power transmitting system

A power transmitting system comprising:

• a power transmitter including a primary-side resonant coil and configured to transmit electric power;
• and
• a power receiver configured to receive the electric power from the power transmitter,
• wherein the power receiver includes
• a secondary-side resonant coil including a resonant coil part and configured to receive the electric power from the primary-side resonant coil through magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil,
• a capacitor inserted in series in the resonant coil part of the secondary-side resonant coil;
• a series circuit, coupled in parallel with the capacitor, of a first switch and a second switch,
• a first rectifier coupled in parallel with the first switch, the first rectifier having a first rectification direction,
• a second rectifier coupled in parallel with the second switch, the second rectifier having a second rectification direction opposite to the first rectification direction,
• a detector configured to detect the electric power received by the secondary-side resonant coil, and
• a controller configured to adjust phases of a first signal for switching on/off the first switch and of a second signal for switching on/off the second switch to adjust an amount of the electric power received by the secondary-side resonant coil.