On capacitor–less linear–assisted DC–DC regulators as candidate topology for photovoltaic solar facilities
Document typeConference report
Rights accessOpen Access
Linear-assisted DC/DC converters (or linear-switching hybrid DC/DC converters) consist of a voltage linear regulator (classic NPN or nMOS topologies and LDO) connected in parallel with a switching DC/DC converter. They are good candidates for energy processing in photovoltaic solar facilities. In order to control these hybrid structures, different strategies exist, allowing fixing the switching frequency as a function of some parameters of the linear regulator. This article compares two control strategies that, although can be applied to the same circuital structure of linear-assisted converter, are sensibly different. The first one, reported in previous literature, cancels completely the average current through the linear regulator in steady state to achieve a reduction of the losses. Thus the efficiency of the whole system increases and almost equals the one of the standalone switching converter. The proposed approach, in spite of a slightly increment of linear regulator’s losses, reduces the output ripple due to the crossover distortion of linear regulator output stage.
CitationMartinez, H. On capacitor–less linear–assisted DC–DC regulators as candidate topology for photovoltaic solar facilities. A: International Symposium on Energy Challenges & Mechanics. "Proceedings of the Sixth International Symposium on Energy Challenges and Mechanics - Towards a Big Picture". 2016, p. 1-10.