Receiver and wireless power supply system

A receiver for wirelessly receiving transmitting power composed of AC signals, the receiver comprising:

• a rectifying unit that rectifies a received AC signal;
• a power management unit that manages a rectified voltage from the rectifying unit;
• a matching unit connected to the rectifying unit or the power management unit, the matching unit including a plurality of capacitors for adjusting an input impedance;
• and
• a control unit that controls a connection state or a supply current of the capacitors of the matching unit,
• wherein, at an initial stage of receiving transmitting power, the control unit performs impedance matching by using one of the plurality of capacitors, and after the control unit is activated, the control unit additionally connects another capacitor other than the one capacitor as a matching network, thereby equalizing fluctuations of an impedance at a subsequent stage of the rectifying unit and maintaining impedance matching between the rectifying unit and an antenna.

A wireless power feeding system, comprising:

• a transmitter that wirelessly transmits transmitting power composed of AC signals;
• and
• a receiver that wirelessly receives the transmitting power, the receiver comprising a rectifying unit that rectifies the transmitting power, a power management unit that manages a rectified voltage from the rectifying unit, a charging unit that is charged with an output voltage from the power management unit, and a control unit that operates on power supplied from the charging unit to control an entirety of the receiver,
• wherein the charging unit includes a plurality of capacitors, and the charging unit includes a second current control unit that makes a charging current of another capacitor among the plurality of capacitors smaller than a charging current of one capacitor during a period from a start of receiving the transmitting power to a predetermined time.