Communication/Model-Free Constant Current Control for Wireless Power Transfer Under Disturbances of Coupling Effect

In this article, we propose a communication-free, continuously regulated, and no additional circuit control scheme to ensure the constant current (CC) output under the inevitable variation of coupling effect between the transmitter and the pickup of wireless power transfer (WPT) systems. By comparing with previous studies on the impact of varying loads, the corresponding key technical challenge is to deal with the untestability of the mutual inductance. Especially for single-side and communication-free control schemes, the impact of coupling effect significantly increases the difficulty for the CC control of WPT systems. Thus, a communication/model-free (C/M-free) CC control is proposed and implemented by using the pretrained neural network, which aims to ensure the expected output current with respect to varying relative position between the transmitting and the pickup coils. Particularly, the pretraining scheme is adopted to reduce the implementation difficulties and the impact of the measurement inaccuracy. In addition, the analysis of robustness and generalization is also carried out to reveal the impact of parameter drifting and load disturbance on the performance of the proposed C/M-free CC control. In this article, the exemplified WPT prototype can realize the constant output current control with the accuracy of 97.6%.