Practical synthesis of various control methods for digitally adjusted DC-DC converters

This paper aims to present a comparative study of various digital control methods for DC-DC converters. These control methods uses Digital Potentiometers, Digital Analog Converters or filtered DPWM signals connected in the feedback control loop of a DC-DC converter in order to adjust the output voltage of the converter. The synthesis presents different mathematical models for calculating the optimal component values for each type of control, detailing the most common effects of components value variation over the entire output range of the converter. The results from computer-aided simulations and a series of experimental measurements validate each previously presented mathematical model. In conclusion, the control methods comparison offers some practical advises about the linearity, resolution, code efficiency in real applications.