Predictive leading-edge modulation average current control in DC-DC converters

Abstract

The paper investigates predictive digital average current control (PDACC) in dc/dc converters using leading-edge modulation (LEM). The study is focused on the recurrence duty cycle equation and then, based on it, stability analysis is performed. It is demonstrated that average current control using leading-edge modulation is stable on the whole range of the duty cycle and thus design problems are highly simplified. The analysis is carried out in a general manner, independent of converter topology and therefore the results can be easily applied for a certain converter topology (buck, boost, buck-boost, etc.). The theoretical considerations are verified using both MATLAB and finally with the CASPOC circuit simulation package. Some simulation aspects regarding the new developed dedicated blocks are also presented.