Cascaded control system design for a Cuk converter via singular perturbation approach

The problem of cascaded control system design for a Cuk converter is discussed where control system consists of three feedback loops. In the first one the input current control is provided by means of pulse-width modulated (PWM) proportional-integral (PI) controller. In the second one the voltage across capacitor for transferring energy is regulated by PI controller. Finally, in the third one the voltage across capacitor for storing energy is maintained by integral (I) controller. The both PI controllers are designed based on singular perturbation technique (time-scale separation technique) such that multi-time-scale motions are artificially induced in the closed-loop system. Numerical simulations are included in order to show the efficiency of the proposed design methodology.