On the Impact of PWM Modulation Strategies on the Discrete-Time Modeling of a Boost Converter
Nicolas Dimate, Sergio A. Dorado-Rojas, and Daniel K. Molzahn
Abstract
Accurate control design of power electronic systems requires a detailed understanding of how modulation influences converter behavior. This paper explores the integration of single- and double-edge modulation strategies into the discrete-time (DT) modeling of DC-DC converters. By revisiting a mathematical framework, large- and small-signal models are derived via a sampled-data approach. Open-loop analysis of a boost converter reveals that the modulation strategy significantly affects the control-to-output transfer function. Trailing-edge modulation yields better phase margins than leading-edge and triangular strategies. Nonlinear simulations confirm that PWM-aware DT models are valuable in critical applications to improve performance through control design.