A Study and Implementation of Inductive Power Transfer System Using Hybrid Control Strategy for CC-CV Battery Charging

In this paper, a hybrid control strategy is studied and implemented on an Inductive Power Transfer (IPT) system to simultaneously realize zero-voltage switching (ZVS) constant current (CC) voltage (CV) battery charging. A steady-state analysis of pulse frequency modulation was conducted, based the characteristic gain versus frequency, CC CV charging modes were promised. The ZVS inverter obtained by satisfying minimum requirement full discharge junction capacitor MOSFETs using commutation during dead-time interval. Two degrees freedom are needed two targets. This adopts self-oscillating (SO) achieve phase shift (PS) output for series–series (SS)-compensated IPT system. To validate strategy, 1.6 kW prototype with 360–440 V input 250–400 built experimental results show that peak efficiency can reach 96.1%. Compared conventional variable (VF) control, method proves additional fulfill target in more flexible manner, which makes close resonant process, minimizing reactive tank improving efficiency.