Analysis of fast-scale instability in a power factor correction Cuk converter

This study investigates fast-scale instability in a power factor correction (PFC) Cuk converter under peak current-mode control. The converter is operated in continuous conduction mode. Computer simulations are performed to study the effects of various circuit parameters on fast-scale instabilities. A prototype of a PFC Cuk converter of 35 W is developed to verify the simulated results and the experimental results are presented. This work provides a clear picture of how the variation of certain parameters can render such a circuit fast scale unstable. Hence, a PFC Cuk converter can be designed to avoid distortion because of fast-scale bifurcation.