Abstract

In this paper, a switched Z-source dc-dc converter (SZSC) is proposed for the conversion from a low voltage to a higher one in renewable energy systems. The voltage gain is increased by adding another one switch and diode to the output terminal of the traditional Z-source dc-dc converter. Not only does the output capacitor function as the filter capacitor; it is also connected in series into the inductors' charging loops when both switches are turned on. Compared with existing Z-source based structures, higher voltage gain is realized with a small duty ratio (smaller than 25%), which can avoid the instability caused by saturation of inductors. Fewer passive components are employed when compared with the recently proposed hybrid Z-source topologies that have the same boost factor, increasing the efficiency and decreasing the cost. Another two switched quasi-Z-source dc-dc converters (SQZSCs) with the same transfer ratio are proposed in analog to the two traditional quasi-Z-source topologies. The performances of the proposed SZSC are analyzed, and then validated by simulation and experimental results.

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