Analysis and robust passivity‐based control of zero‐voltage switching quasi‐resonant Cuk converter

Abstract

Here, a general state-space average model of the half-wave zero-voltage switching quasi-resonant Cuk converter (HW-ZVS-QRCC) is derived and validated. The development of an extended Lyapunov-function-based robust passivity-based control strategy for HW-ZVS-QRCC is carried out using the derived model. The first feature of the proposed controller is that that the resulted closed-loop HW-ZVS-QRCC is globally asymptotically stabilized even if the physical constraint on the magnitude of the control signal is taken into account. Also, to deal with the uncertainties in the conventional passivity-based control (PBC) design, an integral function of the output voltage error is incorporated in PBC structure such that zero-voltage regulation error is assured. Lastly, it shows which variables are most suitable for feedback purposes over a wide range of controller gains. Simulation and experimental results are also provided to validate the theoretical conclusions.