Nonlinear control of interleaving boost AC/DC converters: Output voltage regulation and power factor correction

This article presents a single-phase power factor correction (PFC) circuit for AC-to-DC converter using an interleaved boost converter (IBC), leading to improve the input power factor (PF), reducing the input current harmonics and decreasing the number of needed active switches. The control objectives are twofold: (i) guaranteeing a tight regulation of the DC output voltage to a desired reference value, (ii) assuring a unitary power factor by imposing the voltage and the current delivered by the electric network to be in phase. The studied problem is dealt by designing a cascade-structure nonlinear controller. The inner loop of the latter ensures the PFC objective; it is built-up using the backstepping design approach that is developed making use of the Lyapunov control design technique. The outer loop regulates the converter squared output voltage employing a filtered PI regulator.