Wireless power transfer systems and methods are provided. No wireless communication system is necessary feedback output information from the receiver side to the transmitter side. Nor is any knowledge of the mutual coupling or mutual inductance between the transmitter side and the receiver side required. A system can include an intermediate capacitor in the receiver circuit as a power flow indicator and hysteresis on-off switching actions of a decoupling power switch in the receiver circuit to regulate the DC voltage of the intermediate capacitor (for voltage-control) and the load current (for current-control) at a rated value within a narrow tolerance band. The turn-on and turn-off times of the decoupling switch in the receiver circuit can be detected in the transmitter circuit from, for example, the primary winding current or voltage. This can be used to meet the power demand in the receiver circuit dynamically.
