Bi-direction DC-DC Converter Design Technology Research

With the normal development of science and the improvement of the whole humanbeings, research on the technology of switching power is much more important in the field ofhigh technology. Besides, the key of the switching power is switching converters, whosetopological structure is DC-DC converter. It convertes the noncontrollable DC voltage intothe controllable DC voltage that we adjust in reality, mainly does voltage and current. Then itis applied on the electrical equipment. What is more, bidirectional DC converter can realisebidirectional energy flow, which is widely used in the field of aviation space and electricvehicle. Based on the research of bidirectional Buck-boost DC-DC converter, I spread aserious of researchs on topological structures and its applications.Research object is bidirectional DC-DC converter in this paper. At first, comparing andanalyzing some topological structures of the bidirectional DC-DC converter. According to thedesign of this paper, I choose bidirectional Buck-boost DC-DC converter as main topologicalstructure, and anylise its model of small signal. According to the requirement of paperdesigning converter, I confirm the parameter of the converter, and anylise its open-loopfrequency speciality.After comparing the two controling ways of current-mode and voltage-mode,I choose thecurrent-mode to control the system and design the current regulator and voltage regulator inengineering design method, based on which I apply the regulator’s incremental algorithm totealise the digital design of regulator and put up simulation program to simulate.Aiming at the lack of regulator’s antijamming ability,I apply the method of increasedfeedforward to track the change of the load and design a improved controler, then comparethe improved controler with primary one in simulation.Finally, to realise the requirement of large power in realistic production, I conclude theeffictive method is parallel current sharing. So I choose the maximum current method,whosecurrent-sharing performance has been proved much better those, use simulation programsimulates,and ananlyse the result to find out better current sharing method after comparing themethods of the parallel current sharing.