Stability analysis of DC-DC converters employing digital predictive leading triangle modulation valley current control

Stability of predictive digital valley current control (PDVCC) in dc/dc converters using leading triangle modulation (LTM) is investigated. The study is focused on the recurrence duty cycle equation and then stability analysis is performed. It is demonstrated that PDVCC using LTM is unstable on the whole range of the duty cycle. The analysis is carried out in a general manner, independent of converter topology and therefore the results can then be easily applied for a certain converter topology (buck, boost, buck-boost, etc.). The theoretical considerations are confirmed for a boost converter first using the MATLAB program based on state-space equations and finally with the CASPOC circuit simulation package.