Passivity-Based Nonlinear Control for DC/DC Boost Converter in Wireless Power Transfer Systems with Constant Power Load

This paper presents a passivity-based nonlinear control (PBNC) method by considering Euler Lagrange (EL) model for duty ratio control of DC/DC converter in secondary side of inductive power transfer (IPT) systems. In this regard, an IPT system feeding a constant power load (CPL) is considered. Then, to ensure accurate power transfer regulation and system stability, the proposed control method is applied to the DC/DC boost converter on the secondary side. Without the PBNC, the stability of the system can be affected by the negative incremental impedance characteristic of CPL, which may even cause system instability. The effectiveness of the proposed control method is validated using Matlab/Simpower simulation. The results demonstrate that the proposed control scheme guarantees the stability and robustness of the IPT system in the presence of CPL compared to a proportional-integral (PI) control method.