Research On Dual Buck Half Bridge Inverter And Parallel-output Converters

Dual buck half bridge inverter and other parallel-output inverters has been taken as research object in this paper. Parallel-output topology, composed of two basic unidirectional DC-DC converters whose output sides are connected in parallel, can operate in four quadrants. It is a highly reliable and efficiency way for DC to AC or AC to AC voltage converter.The basic principle and mode how new inverter topologies are composed with basic DC-DC converters have been summarized in this paper at first. And then several new inverter topologies according to the same mode in which dual buck half bridge inverter composed have been proposed. Dual boost half bridge inverter, dual buck/boost half bridge inverter and parallel-output dual flyback inverter, which are typical circuits of parallel output inverter, have been analyzed and verified in this paper. Their features and applications have been compared with series-output inverter at the same time.Dual buck half bridge inverter is the agent and origin of parallel-output inverter. Basic problems of this converter including Operation mode , loss analyze, parameter design, control scheme, mode building and applications have been researched all in detail, and researches on other parallel-output inverters can borrow from these analysis.The topology used by traditional multilevel converter is always H bridge. New multilevel inverters proposed in this paper, who taken dual buck half bridge inverter and other parallel-output circuits as basic topology, has the characteristics of high frequency and efficiency. The basic principle and mode how new multilevel dual buck inverter topologies are composed have been summarized in this paper, and then several new topologies are proposed. Their features and applications have been analyzed and compared too. Multilevel dual buck inverter, which have uni-polarity PWM waveforms output and lower voltage stress is also the improvement of two-level dual buck half bridge inverter.There are several magnetics in parallel-output inverters. Integrated Magnetics technology used in parallel-output inverters has been researched in this paper. Several new parallel-output inverters with integrated magnetics have been proposed and compared. An unexpected bias current will be produced if we use a coupled inductor to replace the two separated inductors of dual buck half bridge inverter directly. Novel dual buck inverter with integrated magnetics of four windings which can resolve this bias problem has been proposed in this paper. How integrated magnetics could be used to overcome peak voltage problem of multilevel dual buck inverter has also been discussed in the paper. Consents of integrated magnetisc distributed in chapters of this paper.Application that parallel-output converters used in AC to AC voltage conversion has been discussed in this paper at last. Combined AC choppers and isolate AC choppers composed in parallel-output mode have been systematically proposed. Their working modes and characteristics are researched, simulation and experiments as verify. Parallel-output AC choppers have been compared with series-output AC choppers at last in this paper.