Heat Distribution of IPT Receiver with Low-Voltage and High-Current Output

The inductive power transfer has been widely applied for battery charging due to several benefits. However, with the increasing output power, the parasitic resistances of coils and compensation components would cause the thermal issue on the receiver, especially for a low-voltage and high-current load. This paper is devoted to addressing the thermal issue by properly selecting receiving-side compensation network, and series (S) and CCL compensations are used as the study cases. The design boundary is derived to guide the compensation selection. It shows that the selection is dependent on the specific system parameters. However, compared with the series compensation, the CCL counterpart may give a higher design freedom and more opportunities to reduce the power loss and redistribute the heat dissipation. Finally, a prototype system with 9-V/5.4-A output is implemented to verify the analysis.