Steady-state analysis of the inductor current behavior and requirements for the control of a single-inductor multiple-input single-output DC-DC power converter

摘要

This paper develops a steady-state analysis for the inductor current behavior and requirements in a single-inductor multiple-input single-output power converter (SI-MISO) topology with time-multiplexing control scheme. The SI-MISO can potentially reduce the number and size of components which is of benefit in many applications. However, it is important to appropriately select and control (1) the ratio between the output switches frequency and input switches frequency and (2) the needed reset time of the inductor current before the end of an input switch turn ON interval. This paper devises the formulas for the peak and valley values of the inductor current, the per cycle average values of the inductor current based on a first order response approximation, the time needed for the inductor current to reach a constant value each time an input switch is turned on, and the needed reset time of the inductor current. Experimental prototype results are obtained in order to validate the analysis.