Abstract
In this paper, an improved coupled-inductor impedance source network (CL-ISN) with more freedom in winding match is proposed. Through introducing three-winding coupled-inductor cells, the proposed CL-ISN can produce the same voltage gain by using different turn ratios among three windings, which will largely increase the freedom in winding match. Also, the proposed CL-ISN can produce the higher boost ability, realize the continuous input current and suppress the start-up inrush current. The topology derivations, math calculations and parameter design of proposed CL-ISN are given out. The proposed CL-ISN is applied for DC-AC converter, and a full comparison between proposed CL-ISN and other impedance source networks are made based on DC-AC converter. Finally, the experiment prototype is built to verify the validity of the theoretical analysis.
Highlights
Voltage Source inverter (VSI) has a limitation that the ac output voltage cannot be higher than input voltage
To further improve the topology performances, this paper proposes an improved coupled-inductor impedance source network (CL-ISN) with more freedom in winding match
Through introducing three-winding coupled-inductor cells, the proposed CL-ISN can produce the same voltage gain by using different turn ratios among three windings, which will largely increase the freedom in winding match
Summary
Voltage Source inverter (VSI) has a limitation that the ac output voltage cannot be higher than input voltage. Switched-inductor Z-source network is proposed in [15] to improve the boost ability, and the cascading concepts are presented in [16], [17] to further obtain the higher voltage gain, but largely increasing the component counts. T-source networks [18] realize the higher boost ability by using one coupled-inductor cells, and the voltage gain and turn ratios have the proportional relations. Ji et al.: Improved Coupled-Inductor Impedance Source Network With More Freedom in Winding Match and extensively applied for DC-DC converter Compared with these impedance source networks [18]–[21], tappedinductor (TL) Z-source network [22] uses two coupledinductors to realize the higher boost ability and reduce the coupled-inductor turn ratios, sizes and weights in the same gain.
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