Research on the Control Strategy of Communication-Free IPT System Based on Multiparameter Joint Real-Time Identification

The control strategy based on parameter identification is a preferred scheme for constant-current (CC) and constant-voltage (CV) charging control of the communication-free inductive wireless transfer system, which is studied and discussed in this article. First, a multiparameter real-time identification method is introduced in detail, which is the basis of this study. Then, two control strategies based on the aforementioned identification method are proposed. One of them is the control strategy based on the PID controller and the identification results of charging information, and its working principle is described in detail. The other is a novel control strategy based on a fast calculation of the conduction angle. The conduction angle calculation process is deduced, and the working principle for CC and CV charging control is provided in detail. Experiments are carried out on a 3.6-kW prototype, and the experimental results show that both the two proposed control strategies can realize the CC and CV charging control effectively, and their response time is shorter than that of the control strategy based on wireless communication. Moreover, the control strategy based on fast calculation of conduction angle has better control performance than the PID-based control strategy because it omits the complicated design process of the controller and saves the dynamic adjusting time that the controller needs.