Tuning of a digital proportional-integral compensator for DC-DC power converter

This paper presents a scheme to manually tune a digital Proportional-Integral (PI) controller (TunePI scheme) to achieve optimized dynamic performance of a DC-DC power converter. Based on a previously proposed compensated-error-signal-based auto-tuning of compensator gain to achieve optimized gain for a given set of other compensator parameters, i.e. zero(s) and pole(s), the paper presents a new scheme that will tune the complete set of a PI compensator parameters to result in a design with an optimum set of parameters for improved dynamic performance. This paper focuses on discussing the TunePI scheme and presenting theoretical and experimental results that employ the TunePI scheme to manually tune a digital PI compensator. This will be used as the base for a future work to develop a controller that is able to auto-tune the PI compensator during the power converter operation (online auto-tuning).