Small signal analysis of V² control using current mode equivalent circuit model

摘要

In V² control, the direct feedback contains the information of both state variables. In this paper, by separating current feedback and capacitor voltage feedback, an equivalent circuit of V² control based on the equivalent circuit of current mode control is proposed. The proposed equivalent circuit provides a clear physical insight of V² control. V² control can be interpreted as an implementation of current mode control with direct voltage feedback and load current feedback. The load current feedback dramatically reduces the output impedance. The model is extended to enhanced V² control. The proposed equivalent circuit model is applicable to both variable frequency modulation and constant frequency modulation. The modeling results are verified by using Simplis simulation and experimental results.