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Summary. This paper proposes a new high-gain quasi-Z-source network (qZSN) with a switched-coupled-inductor (SCL). By employing a two-winding SCL within the impedance network, the proposed topology offers high voltage gains with relatively low shoot-through current and low total voltage stress on switching devices. Other prominent features of the proposed topology can be mentioned as low total voltage stress on the switching devices, continuous dc-input current, and common ground among the input dc-voltage source and the load-side. In addition, the proposed qZSN has a low peak magnetizing current which allows using a smaller size magnetic core for the coupled-inductor. Reduced passive components count along with lower switch current stress lead to lower power losses and converter costs. The superiority of the proposed impedance network is confirmed by comparing its main properties with other successful existing ZS-based topologies. The detailed theoretical analysis and performance principles of the proposed qZSN are validated through experimental results. [ABSTRACT FROM AUTHOR]

This article proposes two magnetic integrated filters, called ${\mathsf \Gamma}$ -source and Flipped- ${\mathsf \Gamma}$ -source with the advantage of better magnetic circuit utilization. Therefore, the number of required magnetic cores and the total size of inductive elements are reduced compared to the other high-order filters, such as the LCL and the LLCL. Also, the total windings copper weight as well as the windings currents and losses are lower. It will be shown that the required air gap for the magnetic core is very short, so the adverse effects of the electro-magnetic interference and the fringing flux are also prevented. Thus, the proposed filters require a small and simple magnetic element, which also works at a lower temperature. Moreover, the proposed filters offer a robust stability and a high filtering performance against a wide range of parameter mismatches. Based on the theoretical analysis and the comparative experimental tests on a grid tied converter, the advantages of the proposed filters are confirmed. [ABSTRACT FROM AUTHOR]

This paper proposes two coupled-inductors-based Z-source networks, called the modified series and tapped switched-coupled-inductors quasi-Z-source networks (mSSCL-qZSN and mTSCL-qZSN, respectively). These networks offer high voltage gains with less-than-unity winding turn ratios $(n < {\text{1)}}$ , resulting in a reduced inductive element size. Other advantages include a less number of active components and their lower ratings and a higher efficiency. In addition, a lower magnetic core size is required for the proposed ZSNs due to the lower peak magnetizing current. The performance principles and detailed comparative analysis are provided and confirmed through experiments on a 200-W dc–dc converter. [ABSTRACT FROM AUTHOR]

In this paper, a novel direct ac–ac converter based on the coupled inductor Z-source networks is proposed that offers a wide range of buck–boost operation. A total of two Z-source networks, called the coupled switched inductor and the modified switched coupled inductor, are employed that enable the ac–ac converter to deliver a wide voltage range. The proposed converter with both networks provides free-wheeling current paths for the inductors currents during the state transitions, which results in solving the commutation problems and the need for snubber circuits. A simple switching strategy is then proposed that helps to share a common magnetic core between the coupled inductors. For any particular voltage gain, the proposed structures require a smaller duty cycle compared to the conventional ones; therefore, a smaller inductance is required. Simulation and experimental results are provided to confirm the theoretical achievements. [ABSTRACT FROM AUTHOR]