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Current-fed quasi-Z-source inverters (qZSIs) have many advantages over traditional current source inverters and current-fed Z-source inverters. This paper presents and analyzes novel adjustable speed drive systems based on the current-fed qZSI that could provide bidirectional power flow, including their topologies, operating principle, and voltage gain. The simulation results are given to verify the...
Based on the analysis of the equivalent circuit model for mushroom-like electromagnetic band-gap structure, a compact EBG structure is proposed. Capacitors and inductors are loaded in series between the neighboring metal patch units in this paper The research demonstrates that when the size of the unit cell remains constant, the band-gap frequency can be decreased by this loading way. Therefore, it...
This paper presents a Z-source ac-ac converter system and control for general-purpose motor drives. The Z-source ac-ac converter system employs a unique LC network to suppress the over-current and surge voltage due to the shoot-through or the open-circuit of the two switches. By controlling the duty cycle, the Z-source can provide buck-boost function, produce greater or less voltage than the line...
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