Novel switched-coupled-inductor quasi-Z-source network with enhanced boost capability
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ORIGINAL ARTICLE
Novel switched‑coupled‑inductor quasi‑Z‑source network with enhanced boost capability Mehran Moslehi Bajestan1 · Mohammad Ali Shamsinejad1 Received: 23 March 2020 / Revised: 14 July 2020 / Accepted: 28 July 2020 © The Korean Institute of Power Electronics 2020
Abstract In this paper, a novel impedance network referred to as a high-gain switched-coupled-inductor quasi-Z-source network (hgSCL-qZSN) is presented. The proposed topology employs a two-winding switched-coupled-inductor and a switchedcapacitor in the impedance network, which offers a higher voltage boost capability when compared to most of the existing ZS-based topologies. In addition, the proposed SCL-qZSN has a low peak magnetizing current, which leads to a smaller core volume. This, in turn, reduces costs as well as core/winding losses. Moreover, to produce higher voltage gains, the presented hgSCL-qZSN requires lower winding turn ratios and shoot-through (ST) ratios, which leads to lower voltage stresses on the passive and active components. A detailed theoretical analysis of the proposed topology is presented in this paper, followed by a number of experimental results. Keywords Switched-coupled-inductors · High gain · Turn ratio · Shoot-through · Quasi-Z-source network (qZSN)
1 Introduction To overcome the inherent limitations of traditional voltagesource and current-source converters (VSCs and CSCs), including only buck or boost conversion capability and vulnerability to short-circuit and open-circuit problems, the Z-source converter (ZSC) was introduced in 2003 [1]. The conventional ZSC employs an X-shaped impedance network, consisting of two inductors and two capacitors, which provides buck-boost capability in single-stage conversion. By introducing shoot-through states into the traditional switching states (six active and two zero states), the ZSC can produce a wide range of output voltages, even output voltages that are greater than the input dc-voltage, without the need for an extra dc–dc converter. Thus, by eliminating dead time in the switching states, the output waveform distortion is decreased and the converter reliability is significantly improved. Despite the unique advantages of the conventional ZSC, it suffers from major drawbacks such as a discontinuous input current and the lack of a common ground among the input dc-voltage source and the load * Mehran Moslehi Bajestan [email protected] 1
Department of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
side. Although it is theoretically possible to dramatically increase the voltage gain, increasing the shoot-through duty ratio to achieve higher voltage gains leads to high-voltage stresses on the passive and active components as well as poor power quality. As a modification of the conventional ZSC, the quasi-Z-source converter (qZSC) has some prominent advantages such as drawing a continuous current from the dc-input source, providing a common ground between the dc-input source and the load, and lower voltage stress on one of
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