A reconstructed LCC‐LCC compensated inductive power transfer system with inherent constant current to constant voltage transition capability

Abstract

SummaryDue to the merits of convenience and flexibility, inductive power transfer (IPT) systems have become popular for energy storage devices, such as lithium‐ion batteries, which require constant current (CC) and constant voltage (CV) outputs. The conventional LCC‐LCC topology with high design freedom is widely used for battery charging. The conventional LCC‐LCC topology achieves the initial CC output and the subsequent CV output by reconfiguring its topology or hopping its operating frequency, which increases the control complexity. This paper proposes a reconstructed LCC‐LCC compensated IPT system, which can achieve the inherent CC‐to‐CV transition without extra components and control methods. Compared with the conventional LCC‐LCC topology having CC and CV outputs, the operating frequency and topology of the proposed IPT system are fixed. Besides, the battery state of charge (SOC) detection and wireless communication are not required. The analysis and parameters design of the proposed IPT system is performed. Finally, an experimental prototype of the proposed IPT system with 48 V input and 72 V/2 A output is built to validate the proposal.