In this paper, a new impedance-source inverter based on the half-bridge configuration is presented. The proposed topology has two switches that make four working modes. These operational modes are analyzed in detail, leading to obtaining the proposed topology's boost-factor. Besides, some equations are derived that are used to design passive elements such as capacitors and inductors. Besides, the voltage stresses on the switches and diodes are obtained. A comparative study from the boost-factor point of view is depicted, which shows that the proposed topology brings a high boost-factor at the output stage. By utilizing transformers, this topology gains a high boost-factor which can be adjusted by changing transformers' windings' turn. In addition to this comparison, other detailed comparisons show that the proposed topology has a reduced number of components with reduced voltage stresses on the passive devices. Finally, to verify the proposed topology's valid performance, a prototype is designed, and its results are studied.

Summary In this paper, a basic unit for the nine‐level converter is firstly presented. Then, a new developed basic unit topology for the multilevel converter is proposed. This topology comprises several bidirectional and unidirectional switches along with dc voltage sources. In order to increase the number of generated levels, a cascade topology based on the series connection of developed basic units is studied. Due to the extensive nature of the presented cascade multilevel converter, the optimization analysis is presented for generating the maximum number of levels with minimum numbers of IGBTs, drivers, dc voltage sources, and voltage on switches. All required mathematical analysis consisting of switching losses, conduction losses, and voltage on switches is illustrated. In order to indicate the merits of the proposed multilevel converter, comparison results are provided. It is shown that the presented topology uses the least numbers of power electronic components. Also, the voltage on the switches in the presented cascade topology is low. For controlling the switches, a modified triangular carrier signal for dual pulse generation is proposed. The performance of the proposed multilevel converter is proven with experimental results of a typical 25‐level converter.

No abstract

No abstract

This paper proposes a new half-bridge-based impedance source inverter with coupled T-shaped inductors. The proposed inverter has a continuous input current and a high boost factor. The proposed topology is thoroughly investigated, along with its operating modes and control system, and the boost factor equation is derived. Additionally, the operating modes' results are incorporated into the design of used components, such as capacitors and inductors. To determine the suggested topology's advantages and disadvantages, a comparison with similar topologies is made based on the number of power electronic devices employed, the boost factor, and the voltage stresses experienced by the components. On the base of these comparisons, it is concluded that the proposed half-bridge-based Z-source inverter has a high boost factor, fewer power electronic components, and reduced voltage stresses. Following that, a power loss study is performed to ascertain the system's power losses and overall efficiency. The prototype's experimental results are considered to evaluate the proposed topology's correct performance.boost factor, continuous input current, half-bridge-based Z-source inverter, voltage stress on devices | INTRODUCTIONConventional inverters, notwithstanding their structural advancements, have certain key limitations. For example, the voltage source inverter (VSI) always operates in a buck mode regardless of the amount of the output voltage. In the same way, the current source inverter (CSI) is always used to boost the power. Furthermore, for VSI and CSI, the short circuit and open circuit states are not permitted. In return, by including an impedance network into the Z-source inverter, 1 it is capable of performing both buck operations and boost operations. Furthermore, the short circuit and open circuit states, often known as the shoot-through (ST) states, are the usual states for the Z-source inverter (ZSI). Because of its unique characteristics, the ZSI structure has recently piqued the interest of researchers in a variety of applications. 2-5 ZSI, however, has a limitation due to its discontinuous input current, which restricts its application. The quasi Z-source inverter (QZSI) with a continuous input current was introduced by Anderson and Peng. 6 Although the QZI has the same boost factor as the ZSI, it has fewer components and less voltage stress on the capacitors. In Loh et al., 7 a new structure known as the embedded Z-source inverter (EZSI) configuration is introduced. The ZSI and this structure have the same number of needed devices and boost factor, as demonstrated by the comparison. EZSI, on the