Study on Chaos Control in PFC Boost Converter Based on the Delay Feedback Control

In Power-Factor-Correction (PFC) Boost Converter, due to the wide fluctuations of the voltage as the power frequency is 50 HZ, the fast-scale instability and chaotic phenomena are apt to appear in circuits. The method commonly used to weaken the unstable phenomena is to introduce the slope compensation. However, since the design of slope signals lacks of theoretical basis, the overcompensation surfaces from time to time, which leads to the substantial drop of input power factors. According to this situation, we introduce the delay feeback control to stabilize the unstable periodic tracks of chaotic attractors. Researches demonstrate that the design of the delay feedback compensation rage is determined by the four main circuit parameters ( the switching cycle, input voltage, output voltage, and inductor) of the converter. Abundant conclusions of simulation experiments testify that the proper delay feedback compensation range not only controls the fast-scale bifurcation and chaotic phenomena, but also maintains the higher input power factor.