Design of Constant-Voltage and Constant-Current Output Modes of Double-Sided LCC Inductive Power Transfer System for Variable Coupling Conditions

It is crucial for inductive power transfer (IPT) systems to achieve load-independent outputs. However, the complex charging environment brings a series of challenges to the parameter design of the IPT system. For example, in the case of wireless charging of electric vehicles, there are situations such as large load variation range and inaccurate coupling coil alignment, which requires the IPT system to maintain constant current (CC) and constant voltage (CV) outputs under variable coupling conditions. Therefore, this article proposes a parameter design method for the double-sided LCC compensation network, which can decouple the CC and CV outputs from the mutual inductance parameter, and by changing the operating frequency, the CC output and CV output of the IPT system can be mutually switching, and with zero phase angle (ZPA) input at the same time. In this article, the CC and CV output modes of the double-sided LCC compensation network are designed based on the two-port network, and then the ZPA input condition is deduced through the mutual inductance model. To maximize the system efficiency, an improved genetic algorithm is proposed to solve the system CC and CV output operating frequencies. Finally, a 3.3 kW prototype and simulation model are established to verify the correctness of the theoretical analysis.