Average current-mode control of Boost converters with bidirectional power transfer capabilities

This paper addresses a potential instability that can take place in Boost converters with average inductor current control. When the output of a Boost converter is attached to a load having bidirectional power capabilities or to an energy source such as a photovoltaic (PV) panel, instability conditions exist which prevent the design of a wide-bandwidth inductor current control. This paper discusses such instability conditions and their physical interpretation, and proposes an alternative control approach solving the problem. Simulation and experimental analyses for a non-inverting buck-boost converter interfacing a 85 W PV module are provided to demonstrate the instability condition as well as to validate the proposed alternative control solution.