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Focus is on a transformer based single-switch galvanically isolated quasi-Z-source converter. Single-switch topologies suit well for low power applications due to low complexity and cost of realization. However, their performance is rather limited, since only one switch should handle all converter power. Input-parallel output-series (IPOS) cascading improves stress of semiconductor devices, reliability,...
Impedance-source converters, an emerging technology in electric energy conversion, overcome limitations of conventional solutions by the use of specific impedance-source networks. Focus of this paper is on the topologies of galvanically isolated impedance-source dc–dc converters. These converters are particularly appropriate for distributed generation systems with renewable or alternative energy sources,...
This paper presents a novel quasi-Z-source half-bridge DC-DC converter family derived by a combination of the single-switch qZS DC-DC converter and the half-bridge galvanically isolated DC-DC converter. The novel topologies have only two active switches and are a cheaper alternative to the galvanically isolated quasi-Z-source DC-DC converters with a full-bridge switching stage. Such promising features...
A novel galvanically isolated quasi-Z-source DC-DC converter with a single switch is presented. It is derived from the conventional single-switch nonisolated quasi-Z-source DC-DC converter. The new topology is within the transformer based class of the galvanically isolated impedance-source DC-DC converters, while existing topologies are solely within the coupled inductor based class. This simple solution...
This paper presents a novel class of quasi-Z-source galvanically isolated DC-DC converters intended for the integration of low voltage renewable energy sources into a DC microgrid. These converters combine characteristics of the transformer based and the inductor based impedance-source galvanically isolated DC-DC converters. They feature the continuous input current essential for photovoltaic applications...
This paper presents a novel quasi-Z-source halfbridge galvanically isolated DC-DC converter intended for the photovoltaic applications. The topology could be envisioned as an alternative to the boost half-bridge DC-DC converter but the benefit of its symmetric structure reduces the threat of transformer saturation due to the dc flux. The proposed converter features the continuous input current and...
Impedance-source switched mode converters are an emerging technology in electric energy conversion. They overcome limitations of conventional solutions by the utilization of specific impedance-source networks. Previous review papers cover impedance-source networks. Focus of this paper is on the topologies of the impedance-source galvanically isolated DC/DC converter. These converters are particularly...
This paper presents a new bi-directional DC/DC converter for supercapacitor interfacing in high-power applications. The converter acts as a VSI-based step-down DC/DC converter during the supercapacitor charging mode and as a qZSI-based step-up DC/DC converter during the energy recovery mode. To provide voltage matching and galvanic isolation the medium frequency transformer was implemented. To ensure...
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