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- Multiple-output switched-capacitor DC-DC combination converters for IoT applicationsPublication . Semiao, J.; Duran, E.; Litran, S. P.; Ferrera, M. B.This paper presents and describes switched-capacitor DC-DC combination converters with a single input and multiple outputs, with step-down and step-up voltage ratios. The combination converters provide two or three different DC outputs (depending on the combination), with different conversion ratios. The main advantage of the proposed converters is the low number of components used in the combination (two-output configurations require two link capacitors, and three-output configurations require three link capacitors) and two complementary phase clocks, which may reduce size and manufacturing costs for many applications. The DC-DC combination converters are designed to be fully integrated, and were implemented in a 65nm CMOS technology. The analysis of the proposed configurations for different performance modes and load conditions is presented, and simulation results show that these combination converter topologies are suitable for multiple-output switched-capacitor DC-DC converters with multiple conversion ratios.
- Analysis of converters with bipolar output for DC microgridPublication . Litran, S. P.; Duran, E.; Barroso, R. S.; Semiao, J.; Ferrera, M. B.Bipolar DC networks have been shown as a suitable solution for low voltage (LV) energy distribution. This paper presents the advantages and disadvantages that they have with respect to other topologies, from the point of view of their implementation, efficiency in the use of energy and its ability to connect large loads. On the other hand, for this type of networks the use of DC-DC converters is required to connect the different sources of distributed generation with guarantees so that the network as a whole can be managed automatically (Smartgrid), both in isolated mode and connected to the conventional AC network. In this line, three configurations of non-isolated DC-DC converters, of a bipolar input and output are presented. That allows connecting DC sources to the network in a controlled way. The behaviour of the converters is verified through a simulation platform based on MATLAB-Simulink and the experimental results will be presented.