Cross-Coupling Compensation Using Gradient Ascent Method for Single-Transmitter Dual-Receiver Wireless Power Transfer

The coupling between the receiver coils i.e. cross-coupling is one of the main challenges in multiple receiver wireless power transfer. Previous studies showed that the cross-coupling can be compensated by adjusting the variable reactance in each receiver. However, the phase difference between the transmitter and receiver current is required in previous control methods, which is not a feasible approach in practical applications. This study proposes a control method for the variable reactances using the information of the input power. The proposed method compensates for the cross-coupling by tracking the maximum point of the input power with variable capacitors. The proposed control method is verified by experiment using pulsewidth modulation controlled switched capacitors.