Inductive Power Transfer System for CC/CV Charging Based on Secondary
Variable Inductor
Abstract
In response to the demand for battery packages in electric vehicles
(EVs), a charging system with constant current (CC) and constant voltage
(CV) two-stage output characteristics should be designed and
implemented. This paper proposes an inductive power transfer (IPT)
system with a double-sided inductor-capacitor-capacitor (LCC)
compensation network connected with a series variable inductor (VI) on
the secondary side. An IPT prototype with a transfer distance of 150mm
and an output power of 3kW is built. In addition, within the set
misalignment range, A constant current output mode of 7.85A and a
constant voltage output mode of 400V can be achieved successively,
avoiding adding DC/DC converters. The experimental results show
that the energy transfer efficiency reaches 87.9% with the alignment of
the magnetic coupling mechanism.