Dynamic characteristics optimization control method for Buck-IPT system

Abstract

Buck-IPT system is composed of a front power regulation buck circuit and a behind inductive power transfer circuit (IPT), which is higher-order, multi-operating-mode, compound nonlinear system. Aiming at dynamic problems such as large inductor current and slow response in the start-up progress, this paper proposes a dynamic characteristic optimization control method. Firstly, this paper proposes a reduced second-order time-varying model considering the inverter's equivalent load characteristic. And then, Based on this model, a sliding-mode control using the exponential reaching law is applied to optimize the start-up process of the Buck-IPT system. Finally, the simulation and experiment results have verified that the proposed method can realize good dynamic performance with fast response, limited-current of front inductor, no overshoot of front capacitor voltage.