Abstract
Magnetically coupled impedance-source networks are often connected with voltage source inverter to obtain a higher voltage gain and achieve less shoot-through duty ratio occupation. Among them, $\Pi $ -source impedance source network was proposed to achieve higher voltage gain, lower current stress, smaller core size, and also smaller circulating current when compared with the conventional $\Delta $ -source inverter, but it still faces the problem of the voltage gain reduction caused by the parasitic resistances. The parasitic resistance effect becomes more serious by the high operating current nature of magnetically coupled impedance-source networks. Therefore, in this paper, the effect of parasitic resistances on $\Pi $ -source impedance network is investigated by modeling the $\Pi $ -source converter with parasitic resistances consideration. Based on this, the voltage gain is firstly deduced and analyzed. Then, the characteristic of the voltage gain is researched under different shoot-through duty ratios, different winding ratios, and different resistances ratios. Different from the ideal lossless case, the voltage gain increases first and then decreases when the shoot-through duty ratio becomes larger. Finally, the correctness of the deduction and analysis in this paper is verified by corresponding simulation and experimental results.
Highlights
Impedance-source networks are usually connected with the voltage source inverter (VSI) to achieve buck-boost operation instead of only buck operation of VSI, so to perform a wide range of electric power conversion in DC-DC, DC-AC, ACDC, and AC-AC systems
The first is by using impedance-source network topologies without magnetically coupled inductors, such as SL-Z-source [7], etc. but the voltage gain characteristic of these topologies still cannot be changed freely
The main contribution of this paper is summarized as below: 1) Proposed -source converter model considering parasitic resistances; 2) The voltage gain is deduced based on the proposed model; 3) The effects of parasitic resistances on -source impedance network are analyzed and investigated under different conditions; 4) Corresponding simulation and experimental results are provided to verify the correctness of the proposed model, deduced voltage gain, and the effects of parasitic resistances on -source network
Summary
Impedance-source networks are usually connected with the voltage source inverter (VSI) to achieve buck-boost operation instead of only buck operation of VSI, so to perform a wide range of electric power conversion in DC-DC, DC-AC, ACDC, and AC-AC systems. But the voltage gain characteristic of these topologies still cannot be changed freely Another category was proposed, namely magnetically coupled impedance-source networks. Ieong et al.: Effects of Parasitic Resistances on -Source Impedance Network consideration of leakage inductance and magnetic saturation due to the usage of magnetically coupled inductors. Among these topologies, -source impedance network was proposed to improve the performance of the aforementioned Y-source and -source. As the magnetically coupled impedance-source networks generally operate at a higher current than the conventional impedance-source networks, a greater amount of I2R loss will be introduced and heavily affect the practical voltage gain. The main contribution of this paper is summarized as below: 1) Proposed -source converter model considering parasitic resistances; 2) The voltage gain is deduced based on the proposed model; 3) The effects of parasitic resistances on -source impedance network are analyzed and investigated under different conditions; 4) Corresponding simulation and experimental results are provided to verify the correctness of the proposed model, deduced voltage gain, and the effects of parasitic resistances on -source network
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