Estimation of the Transferred Power in LCC Compensated Wireless Power Transmitters With the Use of PWM-Synchronized Sampling Technique

Abstract

In this paper, a new technique of synchronized sampling to estimate the transferred power in wireless power transfer (WPT) systems is proposed. Defining demand factor as a criterion linking unknown receiver parameters to the transferred power, it can be estimated by measuring the front-end variables of the transmitter LCC compensating network. Moreover, with the use of this technique, one does not need to know how the mutual inductance or load varies. As the demand factor is directly linked to the transferred power, the estimation of the demand factor can be considered as an increasingly effective way to control the flow of power in wireless power transfer systems. To prove the validity of this approach, a WPT system equipped with an LCC network to compensate the transmitter, and a series capacitor to compensate the receiver, is experimentally built and tested, and the results show a close consistency between the measured demand factor and the transferred power.

Machine Learning Assisted Characteristics Prediction for Wireless Power Transfer Systems

“…Moreover, as discussed in Section II-A, higher-order harmonics of the input current can be dominant (e.g., in case of very low coupling strength or very high load resistance). In [24], authors used an equation-based approach to estimate the output power of the system. However, the estimation error becomes significant when the load resistance is high or the coupling strength is low.…”