Analyzing Continuous Conduction Mode Closed-Loop DC-DC Buck Converters with A Linear Method

Abstract

In this paper, we will study the period 1 dynamics of the closed-loop dc-dc buck converters operating in continuous conduction mode (CCM) by a new theoretical method which is based on the state sequence flow charts proposed by the authors. In our investigation, the derived exact solutions of open-loop converters in CCM can be applied to analyze the period one dynamics of the closed-loop dc-dc buck converters when the feedback dynamic criterion is met. By this criterion equation, the switching time can be solved with numerical method faster. By this determined switching time, steady state time waves of closed-loop dc-dc buck converters operating in CCM can be calculated directly by open-loop derived exact solutions without transition simulations. Output ripple and average output voltages can be calculated within a period time simulations. The benefits of our study will provide a brand-new and precisely point of view to analyze DC-DC converters.