Wireless power receiver and wireless power transmission system

Power is fed from a feeding coil L2 to a receiving coil L3. In a wireless power receiver 118, capacitors CA and CB are each charged by received power and function as a DC power source. Meanwhile, a reference signal and an input signal are supplied to a control signal generation circuit 108. Based on the reference signal and input signal, the control signal generation circuit 108 generates a control signal representing the signal level of the input signal by a duty ratio. A voltage waveform of an output voltage V5 at a load LD is controlled by the control signal.