This article presents the research content of a solution for DC/AC, DC/DC, and isolated AC/DC converters using three-winding pulse transformers to work flexibly with coils that can be primary and secondary. The ratio between the pairs of coils is calculated differently to suit the output voltage requirements for battery charging for EVs and AC microgrid loads with different voltage levels and frequencies. The number of turns of the coil connected to the EV charging station will be 10 times larger than the coils at other outlets, and the coil operates in either primary or secondary mode in the transformer. In this pulse transformer, components such as renewable energy sources of solar panels (PV) DC voltage output, distributed sources, loads, and storage systems in the AC microgrid capable of bidirectional conversion and connecting to the main grid are connected. The main load is the batteries of electric vehicles (EV) supplied with energy in DC from PV sources and from the AC microgrid at the same time or in each case from different energy sources. The converter performs stable and flexible scenario operation to help the EV charging system use renewable energy efficiently, increase the continuous supply of electricity to the AC microgrid load, help save electricity, and stabilize the power system. Simulation results using Orcad software describe the values of current, voltage can reach 1000 VDC for the EV charging station, average conversion power of nearly 10 kW, and the average efficiency achieved by the converter of nearly 96% compared with reference documents and experiments to draw initial conclusions for the research project.