High performance control technique for boost-derived converters: the natural switching surface

Boost-derived topologies play a critical role in many applications such as battery charging systems, bidirectional power flow (electric vehicles), and active power factor correction of grid-connected systems. Fast transient behavior is a fundamental performance requirement in power conversion systems. By improving the dynamics of converters, a number of important advantages can be obtained, including reduction of passive components in the system, increase in power density, cost reduction, and enhanced power quality. The work presented in this thesis provides two key contributions to the field: 1) the development of a theoretical framework to identify and characterize the natural trajectories of boost-derived converters, and 2) the formulation of a control law to operate the converters at the physical performance limit. As a result, the boost-derived converters achieve unprecedented dynamic response. The thesis provides the theoretical derivation, simulation, and experimental validation of a high-performance control scheme referred to as the Natural Switching Surface