PROJECT TITLE :

An Isolated High-Frequency DC–AC Converter Based on Differential Structure With Ultralow Distortion Output Voltage

ABSTRACT:

With the background of power provides for top-precision apparatuses, an isolated high-frequency dc–ac converter based mostly on a differential output structure is proposed. It is composed of two phase-shifted full bridges (PSFBs) that share a standard 0.5-bridge because the lagging leg on the first aspect. 2 current-doubler synchronous rectifiers (CDRs) constitute the differential output structure on the secondary side. The ac output is synthesized by the 2 PSFB-CDRs generating the identical dc bias and phase-reversed ac parts. Compared with traditional solutions, the new circuit has the potential capability to get an ultralow distortion output voltage without using special control or compensations. Moreover, zero voltage switching is realized in the first circuit at intervals a wide load vary, whereas zero current switching is achieved in the secondary circuit. Operation principles are analyzed, and a one-kW prototype is constructed to validate the proposed scheme.


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