Abstract
Performance degradations of DC-DC converters are caused by various complicated factors. In this brief, the output voltage regulation problem in the presence of input time-delay and load uncertainties is addressed by adopting an observer based composite control approach. Firstly, a predictive generalized proportional-integral observer (PGPIO) is constructed to have accurate state predictions as well as disturbance estimations. Then, by integrating the prediction information and choosing appropriate disturbance compensation gains, the adverse influences of the load disturbance can be effectively eliminated from the output voltage channel. Finally, a composite control law is obtained to realize a better voltage tracking performance. Rigorous stability and performance analysis are presented. To verify the feasibility of the designed controller, some experimental comparisons are illustrated. The comparative results show that a better disturbance rejection performance can be achieved even in the presence of time-delay.
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