Accuracy Improvement of Impedance Measurement for Nonlinear Devices

Impedance measurement for nonlinear devices is important in designing and tuning a system of wireless power transfer. Hence, this study has made preliminary contributions to the construction of an integrated real-time nonlinear impedance measurement system. Firstly, building upon previous work, this research deeply explores a nonlinear load impedance measurement method using only a directional coupler and an oscilloscope. Subsequently, addressing practical application scenarios, a calibration method based on the S-parameters of the directional coupler is proposed, further enhancing measurement accuracy. Finally, all data processing is encapsulated into a software, laying the foundation for future development of an integrated real-time measurement system.