Open-loop small-signal modeling of cuk DC-DC converter in CCM by circuit-averaging technique

This paper presents the small-signal modeling of the (Cuk dc-dc converter operating in continuous-conduction mode (CCM) using circuit averaging technique. The dc and low-frequency linear equivalent model of the open-loop lossy (Cuk dc-dc converter is derived. The small-signal model is derived and the following power-stage transfer functions are derived: control-to-output voltage transfer function and input-to-output voltage transfer function. The parasitic resistances of components are included. Using a design example of the converter, the frequency and transient characteristics are analyzed. The validity of the theoretically obtained results are proved by providing simulation results.