Unified model of voltage/current mode control to predict saddle-node bifurcation
This work provides a comprehensive framework for predicting instability in power converters, benefiting control designers, but the results are incremental as they unify existing methods.
The paper proposes a unified model for voltage and current mode control to predict saddle-node bifurcation, deriving exact boundary conditions that can be simplified for design. Multiple analysis approaches are applied and compared.
A unified model of voltage mode control (VMC) and current mode control (CMC) is proposed to predict the saddle-node bifurcation (SNB). Exact SNB boundary conditions are derived, and can be further simplified in various forms for design purpose. Many approaches, including steady-state, sampled-data, average, harmonic balance, and loop gain analyses are applied to predict SNB. Each approach has its own merits and complement the other approaches.