Analysis of Load Impedance Characteristics and Design of Compensation Parameters for IPT System

The rectifier causes the load-equivalent AC impedance of the load to be inductive or capacitive. In severe cases, there will be a loss of duty cycle, which will not only reduce the system efficiency, but also limit the range of load changes, and also increase the difficulty of closed-loop control and system modeling. This paper analyzes the characteristics of the energy transmission system and presents the equivalent circuit in continuous conduction mode. For C-filter rectifier, load AC impedance is resistive load parallel inductanc. For LC-filter rectifier, load AC impedance is resistance series capacitor. Based on the system equivalent circuit, the parameter design methods of different compensation topologies are summarized to solve the problems of output voltage fluctuation and reactive power increase caused by non-resistive load.